Case Study of Building Service in Public buildings

1

Introduction to Building

1.1. Building History

1.2. Building Floor Plans

3~4

5

6

2

Fire Protection System (Active & Passive)

2.1. Introduction

2.2. Report Review

2.3. Case Study

2.4. Conclusion

7

8

9~10

11~29

30~32

3

Air Conditioning System

3.1. Introduction

3.2. Report Review

3.3. Case Study

3.4. Conclusion

33

34

35~37

38~54

55

4

Mechanical Ventilation System

4.1. Introduction

4.2. Report Review

4.3. Case Study

4.4. Conclusion

56

57

58~61

62~74

75~76

5

Mechanical Transportation System

5.1. Introduction

5.2. Report Review

5.3. Case Study

5.4. Conclusion

77

78

78~81

82~91

92

6 Summary / Conclusion93~96

7 References 97~100

CONTENT

1

INTRODUCTIONBUILDING HISTORY | BUILDING FLOOR PLANS

by

TAN JINGWEI

LIEW MIN YEE

1. INTRODUCTION

1.1. Building History

Pantai Hospital (Bangsar) Kuala Lumpur (PHKL) is a private medical centre established by the

Parkway Pantai, Ltd., which is a medical company based in Singapore and it is the largest pricate

healthcare provider in Southeast Asia. The hospital is strategically located close to the city centre

and within the cosy residential neighbourhood of Bangsar, Kuala Lumpur, Malaysia. It has a great

and proud history of being a part of serving the Malaysian public for over 30 years since the year of

1974.

When the PHKL first established in 1974, it initially only consisted of 68 beds and 20 medical

specialists. Besides, the hospital only consisted of only one block of building initially.

After over 30 years, the hospital had gained more technical upgrade and imported more professional

medical equipments, the hospital is now consisting of 332 beds and has more than 160 specialists as

their medical staff. The most vital and vivid development that the hospital had been through are no

other than the addition of the numbers of building blocks. The only building built in 1974 is now

became the oldest part of the hospital, which is called the Block B now, and it is still functioning as

the wad room building. After years, Block C and D are built as the main medical building, and then

the latest building is the Block A, which play the role of reception, commercial and office building,

which is just built in 2014, and which is the specific building that our group do the building services

case study.

The hospital is now providing comprehensive medical healthcare facilities together with the

equipments for diagnostic and therapeutic purposes, such as the Plastic and Reconstructive Surgery,

Eye Surgery, Bone Densitometry, C T Scan and etc.

Source: MEDIGO GmbH, (2016).

5

1. INTRODUCTION

1.2. Building Floor Plans

Block A Ground Floor, Pantai Hospital Kuala Lumpur, Public area.

Pantai Hospital is build on a slope area beside residential area. The whole design of the building is

heading towards environmental friendly. As looking from the plan, the arrangement of the whole

building is facing inwards creating a central space between the buildings. In this project, we will be

looking into Block A, which is the newest building constructed in 2014. The usage of Block A is

mainly for Clinics and offices. Unlike the other blocks, it does not construct specific technology for

hospital. The ground floor is open to public use and the other floors are for shareholders and clinics

departments.

Source: PHKL, (2017).

Ground Floor Landscape & Building Plan, Pantai Hospital, 2014

6

2

FIRE PROTECTION

SYSTEMINTRODUCTION | REPORT REVIEW | CASE STUDY |

CONCLUSION

by

TEH CHIE YANG

2. FIRE PROTECTION SYSTEM

2.1 INTRODUCTION

Fire is a special kind of oxidation known as combustion. Combustion occurred when rapid

combination of a substance with oxygen, involving the production of light and heat.

Fire has a triangle of needs: fuel, oxygen and high temperature. Without any element between this

three, building fire will be extinguished.

As the fire needed the triangle to produce fire, is is also influence on building design. The building’s

structure act as the fuel. The designer controls the choice of structural and finish materials, but rarely

final contents. The temperatures achieved in fires are well beyond the ability of building cooling

system to control. Lastly, Oxygen may be denied to a fire partly due to the limitation of ventilation.

Hence, to properly extinguish the fires, we have to fulfilled 3 objectives:

- Cool the fuel below the ignition point.

- Remove the oxygen supply.

- Separate the fuel from the oxygen.

Fire protection is playing a very important role to prevent this kind of situation happens. Prevention

of the heavy damages can be achieved by installing mechanical fire protection systems in the

building. FIre protection has been splitted into 2 categories: Active and Passive. Active and passive

fire protection system should be intended to intended to join the proficient of in new offices and

redesign ventures.

8


2.2 REPORT REVIEW

2.2.1 Active Fire Protection

Active Fire Protection (AFP) is a group of systems that require some amount of action or motion in

order to work efficiently in the event of a fire. Actions may be manually operated, like a fire

extinguisher or automatic, like a sprinkler, but either way they require some amount of action. AFP

includes fire/smoke alarm systems, sprinkler systems, and fire extinguishers as well as firefighters.

Fire/smoke alarm systems are used to detect whether there is fire and/or smoke in a building.

Sprinkler systems are used to help slow the growth of the fire. Fire extinguishers and firefighters are

used to help put out the fire altogether.

Fortunately, recent decades have seen considerable developments in the area of active fire

protection, with systems becoming more sensitive and equipped with state-of-the-art technology, to

ensure maximum efficiency. This, in turn, has resulted in the number of serious indoor fire-related

incidents across the western world decreasing over the years, providing a safer and more protected

environment for modern citizens to live, work and shop in.

Having gained a basic understanding of what constitutes active fire protection, it is important that

property managers and layman citizens alike be aware of some of the most common measures for

fire detection and prevention which can be considered to fit into the umbrella term ‘active fire

prevention.’

Following is the example of active fire protection:

Water based system

Non-water based system

Alarm and detection system and devices

Smoke alarm system

9


2.2.2 Passive Fire Protection

Passive Fire Protection (PFP) is a group of systems that compartmentalize a building through the use

of fire-resistance rated walls/floors. Compartmentalizing your building into smaller sections helps to

slow or prevent the spread of fire/smoke from one room to the next. PFP helps to limit the amount of

damage done to a building and provides its occupants more time for evacuation. PFP includes

fire/smoke dampers, fire doors, and fire walls/floors. Dampers are used to prevent the spread of

fire/smoke throughout the building through its ductwork. Fire doors help to compartmentalize a

building. Firestopping helps to separate the building into compartments. Photoluminescent egress

path markers help light the way to safety.

Passive Fire Protection begins at the designing and concept stages of any construction. It is built into

the buildings that will ensure the protection of occupants even in the event of the failure of the active

protection. The requirement for passive fire protection are structured in Uniform Building By-Law

(UBBL) 1984.

Passive Fire Protection can be used to delay the speeds of combustion and smoke spreading and at

the same time protecting the escape routes in order to prolong the time for the people to escape.

Example of the passive fire protection that is shown in Pantai Hospital is fire wall, fire exit door,

emergency exit signage, fire emergency staircase and fire evacuation route.

10

http://www.lifesafetyservices.com/fire-life-safety-services/fire-damper-inspection/

http://www.lifesafetyservices.com/fire-life-safety-services/fire-door-inspection/

http://www.lifesafetyservices.com/fire-life-safety-services/firestopping/

http://www.lifesafetyservices.com/fire-life-safety-services/photoluminescence/


2.3 Case Study

2.3.1 Active Fire Protection

2.3.1.1 Fire Hose Reel System

Hose Reel are firefighting equipment for use for a first-aid measure for building occupants.

They should be located somewhere users that are least likely to be endangered by fire. Hose-

reel installations are only for first aid fire-fighting only, but it is a good enough to extinguish

the initial stage of the fire. The hose reel drums are located in specific location that are more

require to be secured in Pantai Hospital. It is in red colour as to meet requirement.

Hose reel Drum

‘

Diagram of the hose reel system

11


The hydraulic requirements for hose-reels is that they should be able to deliver 0.4 litre/s at a

distance of 6m from the nozzle, and that three should be capable of operating simultaneously. A

pressure of 200kPa is required at each nozzle, and if the water main cannot provide this at the

highest reel pumping equipment must be installed.

Hose-reel should be provided at the rate of one reel for every 418m2 of floor area and the nozzle

should reach to within 6m of the furthest part of the building. They should be sited in an escape

corridor, so that they may be used by people leaving the building.

A typical hose reel installation

According to UBBL 1984 Section 248 : Marking on wet riser, etc.

(1) Wet riser, dry riser, sprinkler and other fire installation pipes and fittings shall be

painted as red.

(2) All cabinets and areas recessed in walls for location of fire installations and

extinguishers shall be clearly identified to the satisfaction of the Fire Authority or

otherwise clearly indicated.

12


2.3.1.2 Pump Controlling System

The pump controlling system in Pantai Hospital is used to supply water to the sprinklers and hose

reelss. Water pump is very important to fire protection system because it used diesel to operate

instead of electricity because electricity might not working during fire.

The water supply is distributed via several pipelines and each of the pipelines is supported by high

power pump so the water can move in high speed and immediately extinguish the fire.The fire pump

starts when the pressure in the fire sprinkler system drops below a threshold.

Pump Controlling System

A jockey pump is a pump connected to a fire sprinkler system and is intended to maintain pressure

in a fire protection piping system to an artificially high level so that the operation of a single fire

sprinkler will cause a pressure drop which will be sensed by the fire pump automatic controller,

causing the fire pump to start. The jockey pump is essentially a portion of the fire pump's control

system.

Jockey pump

13

https://en.wikipedia.org/wiki/Fire_sprinkler


A duty pump will will pressurizes the water to maintain the system when the pressure pipe is not

functioning anymore. While standby pump is triggered when both duty pump and pressure pipe are

not working anymore. It will activated automatically. However, it can be switched off manually by

the nearby control panel.

Duty pump and standby pump

Control panel for duty pump and standby pump

According to UBBL 1984 Section 253 (2) : Emergency power system

Emergency power system shall be provided power for smoke control system, illumination,

fire alarm systems, fire pumps, public address systems, fire hits and other emergency system.

14


2.3.1.3 Fire Alarm System

A fire alarm system serves primarily to protect life and secondarily to prevent property loss. Because

buildings vary in occupancy, flammability, type of construction, and value, a fire alarm system must

be tailored to the needs of a specific facility. One of the type of alarm system that is used in Pantai

Hospital is Manual-electrical alarm. Electrically operated alarms may be operated from break-

glass call points and, once operated, the alarms will continue to sound automatically. The usual

maximum travel distance to operate the alarm is 30m and the call points should be fitted at a height

of about 1.4m above the floor. The call point contains a depressed plunger pressing against a glass

front. When the glass is broken the plunger is released and operates the alarm system.

One of the many fire triggers in Pantai Hospital.

Break-glass call point Diagrammatic arrangement of system

15


Another fire alarm system is applied by alarm bell. A fire alarm bell may use audible, visible, or

other stimuli to alert the occupants of a fire or other emergency condition requiring action. Audible

appliances have been in use longer than any other method of notification. The alarm bell produces

sound pressure levels between 45 and 120 decibels at ten feet. The signal can be triggered both

automatically or manually through manual call point or smoke detector.

Fire alarm bell

According to UBBL 1984 Section 155 : Fire mode of operation

(1) The fire mode mode of operation shall be initiated by a signal from the fire alarm

panel which may be activated automatically by one of the alarm devices in the

building or manually.

UBBL 1984 Section 237 : Fire Alarm

(1) Fire alarms shall be provided in accordance with the Tenth Schedule to these By-laws.

(2) All premises and building with gross floor area excluding car park and storage area

exceeding 9290 square metres or exceeding 30.5 metres in height shall be provided

with a two-stage alarm system with evacuation (continuous signal) to be given

immediately in the affected section of the premises while an alert (intermittent signal)

be given adjoining section.

(3) Provision shall be made for the general evacuation of the premises by action of a

master control.

16

https://en.wikipedia.org/wiki/Decibels


2.3.1.4 Fireman Intercom System

Communication between firefighters is one of the most crucial aspects of containing and suppressing

fires. This communication needs to be instant and effective. The fire intercom system is primarily a

method of communication between firemen during an emergency. Usually used for fire evacuation

purposes. It is usually located near the emergency escape of the buildings.

The fireman intercom system that is used in Pantai Hospital is DECT. DECT is a section of

bandwidth that is reserved specifically for voice communication. This means that it is much less

cluttered than the Bluetooth spectrum, which means DECT intercom systems are much less likely to

suffer from interference than Bluetooth systems. Hence, firefighting teams will prefer to utilize

intercom systems that operate with the DECT protocol.

Fireman intercom system

According to UBBL 1984 Section 239 : Voice Communication System

There shall be two separate approved continuously electrically supervised voice

communications systems, one a fire brigade communications systems and the other a public

address system between the central control station and the following areas:

(a) Lifts, lift lobbies, corridors and staircases;

(b) In every office area exceeding 92.9 square metres in area;

(c) In each dwelling unit and hotel guest room where the fire brigade system may be

combined with the public address system.

17


2.3.1.5 Fire Extinguisher

Fire extinguishers are designed to tackle specific types of fire. There are six different classes of fire

and several different types of fire extinguishers. They are extremely valuable for extinguishing fires

at the early stages, but they cannot be used successfully to deal with large fires.

Pantai Hospital uses Portable fire extinguishers for their building. The term “portable fire

extinguishers’ generally covers first-aid fire fighting appliances which can be carried by hand from

which the extinguishing agent can be expelled, usually under pressure. There are 2 types of fire

extinguishers found in the building : Dry powder extinguishers and carbon dioxide extinguishers.

18


a. Dry powder extinguisher

General-purpose dry powder is suitable for all classes of fire risks and is particularly suitable for

fires in flammable liquids. The powder consists of a finely divided, non-conducting, non-toxic,

water-repellent material which cools the flames,separates them from the burning material and

exclude oxygens. It also acts as a form of screen, thus enabling the operator to approach close the

fire. The dry powder stored in the body of the extinguisher is pressurised by nitrogen or air, which

expels the powder when the release valve is opened.

Alternatively, the dry powder may be expelled from the container by carbon dioxide gas after

breakage a seal of a cartridge.

Dry powder fire extinguisher Diagram of dry powder fire extinguisher

19


b. Carbon dioxide fire extinguisher

Carbon dioxide is pressurised as a liquid inside a cylinder. Striking a knob at the top of the cylinder

pierces a disc to release the carbon dioxide which converts to a gas as it depressurises through the

extinguisher nozzle.

CO2 fire extinguisher Diagram of CO2 fire extinguisher

According to UBBL 1984 Section 227 : Portable extinguishers

Portable extinguisher shall be provided in accordance with relevant codes of practice and

shall be sited in prominent positions on exit routes to be visible from all directions and similar

extinguishers in a building shall be of the same method of operation.

20


2.3.1.6 Sprinkler system

Water sprinklers provide an automatic spray dedicated to the area of fire outbreak. Each closed-head

sprinkler is held closed by either a heat-sensitive glass bulb or a two-part metal link held together

with fusible alloy.Sprinkler heads have temperature-sensitive elements that respond immediately to

heat, discharging the contents of the water main to which they are attached. It does less water

damage than fire hose due to it use less water to control a fire than the firefighting service. Therefore

it does preventing further damage from excess water.

Upright water sprinkler seen in Pantai Hospital

a. Upright Sprinkler

One of the water sprinklers that is used in Pantai Hospital is upright sprinklers. Upright sprinkler

heads project up into a space and have deflectors that spray the water downward. They are generally

used in mechanical rooms or other inaccessible areas to provide better coverage between

obstructions like beams or ducts. They also provide a circle spray pattern.

Diagram about upright water sprinkler Components of upright water sprinkler

21

https://en.wikipedia.org/wiki/Fusible_alloy


b. Recessed Pendent Sprinkler

Another type of sprinkler is recessed pendent sprinkler. It is different from upright sprinkler as it

shoots the water downward from the ceiling instead of upward. However, They are both shoot out

the water in a circle. As the recessed pendent sprinkler is built inside the ceiling, the pipes that

connecting the water will be hidden from our eyesight to avoid the unappealing appearance.

Recessed pendent sprinkler Diagram of the pendent sprinkler

According to UBBL 1984 Section 228 : Sprinklers valve

(1) Sprinkler valves shall be located in a safe and enclosed position on the exterior walls

and shall be readily accessible to the Fire Authority.

(2) All sprinkler systems shall be electricity connected to the nearest fire station to

provide immediate and automatic relay of the alarm when activated.

22


2.3.1.7 Smoke Detector

Smoke detector is a device that use to sense the smoke, which is very great to detect the fire. There

are 2 types of smoke detector: Ionisation smoke detector and photoelectric smoke detector. Hospital

Pantai used the ionisation smoke detector only.

One of the ionisation smoke detector in Pantai Hospital

Ionisation smoke detector applies the theory of positive and negative charged plate electrode will

attract the opposite of charged ions. An ion is an atom or a group of atoms which have lost or gained

one or more electrons. If smoke enters the unit, particles attach to the ions slowing their movement.

The reduction in current flow actuates an electronic relay circuit to operate an alarm.

Diagram of ionisation smoke detector

According to UBBL 1984 Section 153 : Smoke detectors for lift lobbies

(1) All lift lobbies shall be provided with smoke detectors.

(2) Lift not opening into a smoke lobby shall not use door reopening devices controlled by

light beam or photo-detectors unless incorporated with a force close feature which

after thirty seconds of any interruption of the beam causes the door to close within a

preset time.

23


2.3.2 Passive Fire Protection

2.3.2.1 Fire Escape Plan

It is important to have a fire escape plan in a building as it provide a guidance for the people

when the fire is occurred. It is usually found beside the elevators. The fire escape plan shows

that it is important to know that people shouldn’t use the elevators during the fire happens.

The highlighted yellow shows the walkway to escape. The width of the walkway must be

wide enough for the people to escape .

Fire escape plan Assembly point

According to UBBL 1984 Section 169 : Exit Route

No exit route may reduce in width along its path of travel from the storey exit to the final exit.

According to UBBL 1984 Section 178 : Exist for institutional and other place of assembly

In buildings classified as institutional or places of assembly, exits to a street or large open

space, together with staircases, corridors and passages leading to to such exits shall be

located, separated or protected as to avoid any undue danger to the occupants of the place of

assembly from the fire originating in the other occupancy or smoke therefrom.

24


2.3.2.2 Fire Switch

The fireman switch is a switch-disconnector/ isolator for special applications. They are designed to

be easy to spot and are used by firemen to turn off neon-lighting or other hazardous electrical

equipment in case of fire. The enclosure is made of nonflammable material. It is painted red in order

to be easy to spot. The on and off positions are clearly indicated on the front side with “I” and “O”.

The operating handle is designed in such a way that a fireman hook or axe can be used to switch off.

According to UBBL 1984 Section 240 : Electrical isolating switch

(1) Every floor or zone of any floor with a net area exceeding 929 square metres shall be

provided with an electrical isolation switch located within a staircase enclosure to

permit the disconnection of electrical power supply to the relevant floor or zone

served.

(2) The switch shall be of a type similar to the fireman’s switch specified in the Institution

of Electrical Engineers Regulations then in force.

25


2.3.2.3 Fire Door

Fire doors have two main functions when fire breaks out. It is used to contain fire and smoke and

allow easy escape from the building. It is a specially made door with a fire-resistance rating. It can

reduce the spread of fire and smoke between separate compartments of a structure. Fire doors can be

seen in Pantai Hospital that near the to exit route as it is reasonably be built at there.

Fire door at one of the exits

According to UBBL 1984 Section 162 : Fire doors in compartment walls and separating

walls

(1) Fire doors of the appropriate FRP shall be provided.

(2) Openings in compartment walls and separating walls shall be protected by a fire door

having a FRP in accordance with the requirements for that wall specified in the Ninth

Schedule to these By-laws.

(3) Openings in protecting structures shall be protected by fire doors having FRP of not

less than half of requirement for the surrounding wall specified in the Ninth Schedule

to these By-laws but in no case less than half hour.

(4) Opening in partitions enclosing a protected corridor or lobby shall be protected by fire

doors having FRP of half-hour.

(5) Fire doors including frames shall be constructed to a specification which can be shown

to meet the requirements for the relevant FRP when tested in accordance with section

3 of BS476:1951.

26

https://en.wikipedia.org/wiki/Fire

https://en.wikipedia.org/wiki/Smoke

https://en.wikipedia.org/wiki/Compartmentalization_(fire_protection)


2.3.2.4 Fire Staircase

Fire staircase is the most common element in the escape route. It is basically connected together

with the fire door at every level. Pantai Hospital using the U-shaped staircase as the fire staircase

with material of concrete. There should be no obstacle in any staircase from the highest level to the

lowest level. Furthermore, the staircase should be wide enough for people to run through.

Fire staircase

According to UBBL 1984 Section 168 : Staircases

(1) Except as provided for in law 194 every upper floor shall have means of egress via at

least 2 separate staircase.

(2) Staircase shall be of such width that in event of any one staircase not being available

for escape purposes the remaining staircases shall accommodate the highest

occupancy load of any one floor discharging into it calculated in accordance with

provisions in the Seventh schedule to these By-laws.

(3) The required width of a staircase shall be the clear width between walls but handrails

may be permitted to encroach on this width to a maximum of 75 millimetres.

(4) The required width of a staircase shall be maintained throughout the length including

landings.

(5) Doors giving access to staircases shall be so positioned that their swing shall at no

point encroach on the required width of the staircase or landing.27


2.3.2.5 Emergency Exit Signage

Emergency exit signage provides clear visual guidance to the nearest exit, which could prove

invaluable in an emergency. The exit signs are indicated with the neon green colour as it easily be

noticeable during dark. These signs are always lit up at night and remain light off during morning in

Pantai Hospital.

Emergency exit signage

According to UBBL 1984 Section 172: Emergency exit signs

(1) Storey exits and access such exits shall be marked by readily visible signs and shall

not be obscured by any decorations, furnishings or other equipment.

(2) A sign reading “KELUAR” with an arrow indicating the direction shall be placed in

every location where the direction travel to reach the nearest exit is not immediately

apparent.

(3) Every exit sign shall have the word “KELUAR” in plainly legible letter not less than

150 millimetres high with the principal strokes of the letters not less than 18

millimetres wide. The lettering shall be in red against a black background.

(4) All exit signs shall be illuminated continuously during periods of occupancy.

(5) Illuminated signs shall be provided with two electric lamps of not less than fifteen

watts each.

28


2.3.2.6 Emergency Light

Emergency lighting is one component of the means-of-egress illumination and is part of a building’s

life safety systems. Emergency lighting can be described as any approved illuminating device and

appurtenance designed to automatically turn on when the primary power goes out. Exit signs are

used in combination with emergency lighting to provide means of egress lighting.

Emergency light

29


2.4 Conclusion

In conclusion, fire protection is necessary in every building. Pantai Hospital has successfully

fulfilled the requirements about fire protection. As the building is relatively new, every fire

protection equipments are in a good condition. They have consider many aspects before they design

the layout of the building especially for the active fire protection system.

Design for active fire protection system is pretty hard compared to the passive fire protection as you

have to consider much when you are trying to place in certain area. Active fire protection provides a

very good way to control and extinguish fire, either automatically or manually. All active fire

protection systems are required to be installed and maintained in accordance with strict guidelines in

order to maintain compliance with the local building code and the fire code.

However, passive fire protection system is equally important to active fire protection system. Their

main function is to slow the spread and contain the fire as well as educating the occupants and

operators of the facility, ship or structure concerning operation and maintenance of fire-related

systems for correct function, and emergency procedures including notification for fire service

response and emergency evacuation. In Pantai Hospital, they have successfully provide a complete

passive fire protection system which can be very useful if the fire occurred.

To summarize the fire protection system, it is important in mitigating the unwanted effects of

potentially destructive fires. If a building doesn’t have a proper fire protection system, it will be a

large issue when the fire is actually happened. Pantai Hospital attaches great importance to fire

protection system which is very good as they care about the safety of the patients, visitors and

workers.

The Pantai Hospital has achieved the following requirements and regulations:

According to UBBL 1984 Section 248 : Marking on wet riser, etc. Wet riser, dry riser, sprinkler

and other fire installation pipes and fittings shall be painted as red. All cabinets and areas

recessed in walls for location of fire installations and extinguishers shall be clearly identified

to the satisfaction of the Fire Authority or otherwise clearly indicated.

According to UBBL 1984 Section 253 (2) : Emergency power system, emergency power system

shall be provided power for smoke control system, illumination, fire alarm systems, fire

pumps, public address systems, fire hits and other emergency system.

According to UBBL 1984 Section 155 : Fire mode of operation, the fire mode mode of operation

shall be initiated by a signal from the fire alarm panel which may be activated automatically

by one of the alarm devices in the building or manually.

30

https://en.wikipedia.org/wiki/Building_code

https://en.wikipedia.org/wiki/Fire_service

https://en.wikipedia.org/wiki/Conflagration


2.4 Conclusion

UBBL 1984 Section 237 : Fire Alarm, fire alarms shall be provided in accordance with the Tenth

Schedule to these By-laws. All premises and building with gross floor area excluding car

park and storage area exceeding 9290 square metres or exceeding 30.5 metres in height shall

be provided with a two-stage alarm system with evacuation (continuous signal) to be given

immediately in the affected section of the premises while an alert (intermittent signal) be

given adjoining section. Provision shall be made for the general evacuation of the premises

by action of a master control.

According to UBBL 1984 Section 239 : Voice Communication System, there shall be two

separate approved continuously electrically supervised voice communications systems, one a

fire brigade communications systems and the other a public address system between the

central control station and the following areas:

a. Lifts, lift lobbies, corridors and staircases;

b. In every office area exceeding 92.9 square metres in area;

c. In each dwelling unit and hotel guest room where the fire brigade

system may be combined with the public address system.

According to UBBL 1984 Section 227 : Portable extinguishers, portable extinguisher shall be

provided in accordance with relevant codes of practice and shall be sited in prominent

positions on exit routes to be visible from all directions and similar extinguishers in a

building shall be of the same method of operation.

According to UBBL 1984 Section 228 : Sprinklers valve, sprinkler valves shall be located in a

safe and enclosed position on the exterior walls and shall be readily accessible to the Fire

Authority. All sprinkler systems shall be electricity connected to the nearest fire station to

provide immediate and automatic relay of the alarm when activated.

According to UBBL 1984 Section 153 : Smoke detectors for lift lobbies All lift lobbies shall be

provided with smoke detectors. Lift not opening into a smoke lobby shall not use door

reopening devices controlled by light beam or photo-detectors unless incorporated with a

force close feature which after thirty seconds of any interruption of the beam causes the door

to close within a preset time.

According to UBBL 1984 Section 169 : Exit Route, no exit route may reduce in width along its

path of travel from the storey exit to the final exit.

According to UBBL 1984 Section 178 : Exist for institutional and other place of assembly, in

buildings classified as institutional or places of assembly, exits to a street or large open

space, together with staircases, corridors and passages leading to to such exits shall be

located, separated or protected as to avoid any undue danger to the occupants of the place of

assembly from the fire originating in the other occupancy or smoke therefrom.31


2.4 Conclusion

According to UBBL 1984 Section 240 : Electrical isolating switch， every floor or zone of any

floor with a net area exceeding 929 square metres shall be provided with an electrical

isolation switch located within a staircase enclosure to permit the disconnection of electrical

power supply to the relevant floor or zone served. The switch shall be of a type similar to the

fireman’s switch specified in the Institution of Electrical Engineers Regulations then in

force.

According to UBBL 1984 Section 162 : Fire doors in compartment walls and separating walls,

fire doors of the appropriate FRP shall be provided. Openings in compartment walls and

separating walls shall be protected by a fire door having a FRP in accordance with the

requirements for that wall specified in the Ninth Schedule to these By-laws. Openings in

protecting structures shall be protected by fire doors having FRP of not less than half of

requirement for the surrounding wall specified in the Ninth Schedule to these By-laws but in

no case less than half hour. Opening in partitions enclosing a protected corridor or lobby

shall be protected by fire doors having FRP of half-hour. Fire doors including frames shall be

constructed to a specification which can be shown to meet the requirements for the relevant

FRP when tested in accordance with section 3 of BS476:1951.

According to UBBL 1984 Section 168 : Staircases, except as provided for in law 194 every upper

floor shall have means of egress via at least 2 separate staircase. Staircase shall be of such

width that in event of any one staircase not being available for escape purposes the remaining

staircases shall accommodate the highest occupancy load of any one floor discharging into it

calculated in accordance with provisions in the Seventh schedule to these By-laws. The

required width of a staircase shall be the clear width between walls but handrails may be

permitted to encroach on this width to a maximum of 75 millimetres. The required width of a

staircase shall be maintained throughout the length including landings. Doors giving access

to staircases shall be so positioned that their swing shall at no point encroach on the required

width of the staircase or landing.

According to UBBL 1984 Section 172: Emergency exit signs, storey exits and access such exits

shall be marked by readily visible signs and shall not be obscured by any decorations,

furnishings or other equipment. A sign reading “KELUAR” with an arrow indicating the

direction shall be placed in every location where the direction travel to reach the nearest exit

is not immediately apparent. Every exit sign shall have the word “KELUAR” in plainly

legible letter not less than 150 millimetres high with the principal strokes of the letters not

less than 18 millimetres wide. The lettering shall be in red against a black background. All

exit signs shall be illuminated continuously during periods of occupancy. Illuminated signs

shall be provided with two electric lamps of not less than fifteen watts each.

32

3

AIR CONDITIONING


CONCLUSION

by

CHONG CHIN PIN

LIEW MIN YEE

3. AIR CONDITIONING SYSTEM

3.1 Introduction

Air conditioning system is composed of a group of components and arrange in sequence to

perform many functions simultaneously. It controls and maintains the temperature, humidity, air

movement, air cleanliness, sound level, and pressure differential in a space to maintain the

occupants' thermal comfort. The purpose of installing air conditioning system to a building is to keep

the indoor space comfort level higher than the outdoor. Comfort Requirements that are typically

impacted by the air conditioning system are Dry-bulb temperature, humidity, cleanliness of air and

noise levels.

3.1.1 Refrigeration Cycle

Refrigeration Cycle. Pete Hoffman, (2006).

For the economic purpose, the refrigerant will be used repeatedly. The refrigerant is used to

remove the heat from one area to cool this area and to expel this heat in another area.

Refer to the Refrigeration cycle diagram above:

1. The refrigerant comes into the compressor as a low-pressure gas. The gas has been

compressed and then moves out of the compressor as a high-pressure gas.

2. The gas then flows to the condenser. It condenses to a liquid and releases its heat to the

outside air.

3. The liquid then moves to the expansion valve under high pressure. This valve restricts

the flow of the fluid and lowers its pressure.

4. The low-pressure liquid then moves to the evaporator, where heat from the inside air is

absorbed and changes it from a liquid to a gas.

5. The low-pressure liquid then moves to the evaporator. The heat from the inside air will

be absorb and change it from a liquid to a gas.

6. The refrigerant as a hot low-pressure gas moves back to the compressor. The entire cycle

repeats again.

A refrigeration cycle is a means of transferring heat source from high-temperature region to low-

temperature region to decrease its temperature. However, the reverse process cannot occur itself, it

needs to include the refrigerator. The four stages of the cycle includes compression, condensing,

expansion and vaporization at a constant pressure.

Principles of Refrigeration Cycle

● Liquids absorb heat when

changed from liquid to gas

● Gasses give off heat when

changed from gas to liquid.

34


3.2 Report Review

There are different type of common air condition system in high-rise building, Centralised Air

Conditioning System, District Cooling System(DCS) and chilled beam system. The focal point in

this report will be in Malaysia, a tropical country which only only require cooling system.

3.2.1 Centralised Air Conditioning

Centralised Air Condition system can be use in both high-rise and low-rise building which spaces

that needs to be completely air conditioned. This system comprised by a huge compressor which

can produce high tons of chilled air. Along with refrigerator principle, AC contain three main parts:

condenser, evaporator and compressor.

The centralised air duct draw room’s air through return ducts, then transfers cool air through a filter

and follow by air-supply duct, chilled air is route to different rooms. However, it is not suitable to

cool down a big space such as auditorium. It is only feasible with a central conditioning unit. The

condenser and compressor are placed in an outdoor unit. The function of centralised air conditioning

does not create heat or cool air, it transfer the heat from undesirable area to a specific space through

a furnace.

3.2.2 District Cooling System

District Cooling System (DCS) is a system using water plant to distribute chilled water to multiple

buildings through underground insulated pipelines.This system can be apply to industrial and

residential buildings. This system only require one cooling plant to cool down multiple buildings in

one district by running water to lower down air temperature of a bigger building.

Centralised Air Conditioning used in residential Centralised Air Conditioning cycle plan

35

3.2.2 District Cooling System Cont’

3.2.3 Chilled Beam System

Chilled Beam System is one of the most common HVAC system designed to heat or cool high-rise

building, mainly for cooling building. There are two main types of chilled beams in this system :

active and passive. The main components of this system are copper tubing, bonded to aluminium

fins, tubes and water plant. Usually placed at ceiling level. This system are more quiet than the other

system and does not require mechanical room or large ductwork. However, this system works better

to building based on heating and cooling instead of ventilating.

3.2.3.1 Passive Chilled Beam(PCB)

A PCB works by leading chilled water through the tube and cool down the warm air that rises

towards the ceiling. After the warm air cooled down, it descends back to the room, creating

convection air motion to cool down space without using any fan. However, PCB require ventilation

air to be delivered by a separate furnace.

3.2.3.2 Active Chilled Beam(ACB)

The usage of ACB are more common than PCB due to the cooling efficiency. ACB contains an

integral air supply which induce air from space up through cooling coil. This process allow ACB to

provide much more cooling capacity.


The components in District Cooling System(DCS) are more simple than other system for high-

rise. It requires a Central Chiller Plant, a distribution network and a user station. Central Chiller

Plant generate cooling water, then distribute the water through pipelines to user station.

District Cooling System is one of the newest system design that covered various consideration,

the system can be powered by electricity or natural gas. For liquid source it can use either sea

water,water or other media. It cuts down uses of electricity and maintenance costs dramatically.

Hence, it becomes one of the economical and environment friendly system in tropical country.

District Cooling System(DCS), Putrajaya, Malaysia Diagram of District Cooling System(DCS)

36

3.2.3.2 Active Chilled Beam(ACB) cont’


Circulation of Chilled Beam SystemComparison of PCB and ACB

37

3.3 Case Study

3.3.1 Introduction

Pantai Hospital is located at tropical country, which ventilating and air-conditioning(VAC) are

only needed in the system. Consider the large cooling capacity, cost efficiency and environment

friendly of the building, Pantai Hospital is running with Chilled Water Central Air-Conditioning

System, commonly known as Chilled Water System.

3.3.2 Chilled Water System

A chilled-water air handler is located in an equipment room on each floor of the building.

Each air handler is equipped with a variable volume supply fan and discharges conditioned supply

air into ductwork located in the ceiling plenum above each floor. The supply ductwork is connected

to the variable-air-value system (VAV) terminal units that serve each zone. Air returns from the

zones through the open ceiling plenum into the equipment room, where it is drawn back into the air

handler. The chilled water is provided by a water-cooled chiller that is located in the basement,

along with the chilled water and condenser water pumps. A cooling tower is located on the roof.

For the Pantai Hospital, heating is provided by a hot-water boiler in the basement and hot-

water heating coils located at the discharge of each VAV terminal unit. Then, the system-level

controller ties the unit controllers on each of the VAV terminal units to the controllers on the air

handlers and also coordinates the operation of the chiller, the cooling tower, the pumps, the hot-

water boiler, and the central exhaust fan.


38

3.3.2 Chilled Water System Cont

3.3.2.1 Centrifugal Water Chiller

Centrifugal water chillers can divide into two types which are water-cooled or air-cooled.

Pantai Hospital is using the water cooled centrifugal compressor package in sizes of 150 tons(350

kW) or more. These complete package chillers will include the compressor, condenser, evaporator,

internal piping and capacity controls. The centrifugal water chiller is located in the basement, a heat

remover using vapor-compression refrigeration cycle. The function is to cool down water that flows

through pipelines in the building and passes through the system and dehumidify the air in the

building. In Pantai Hospital, there is four chiller placed behind the pumps.

These particular centrifugal water chillers make use of a shell-and-tube evaporator.

The refrigerant absorbs heat from the water flowing through the tubes. A second shell-and-tube heat

exchanger serves as the water-cooled condenser, where the refrigerant is condensed inside the shell

and water flows inside tubes. The refrigerant is metered through the system using an expansion

device such as a fixed orifice plate. Economizer has used to enhance the efficiency of the chillers

with multiple compressor impellers.


Chilled water system. Source: Convergence Training, (2016).

UBBL-SECTION 41

(3) The provisions of the Third Schedule to these By-laws apply to buildings which are

mechanically ventilated or air-conditioned.

39

3.3.2.1 Chilled Water System Cont


Diagram of water chiller, Pantai Hospital Chillers behind pumps, Pantai Hospital

Centrifugal Water Chiller, Pantai Hospital

MS 1525:2014

8.2.1 Air conditioning systems and equipment shall be sized to provide no more than the space and

system loads calculated in accordance with 8.1 above, consistent with available equipment

capacity. Redundancy in the capacity of equipment, if incorporated into the sizing of the duty

equipment, should include efficiency devices such as variable speed drive, high-efficiency motor,

efficient unloading devices, multi compressors etc. so as not to diminish the equipment/system

efficiency when operating at varying loads.

8.2.2 Where chillers are used and when the design load is greater than 1000 kWr, a minimum of

either two chillers or a single multi-compressor chiller should be provided to meet the required

load.

40

3.3.2.1.1 Water Chiller Components

1. Air Switch

2. Non-airborne Starting Cabinet

3. Motor Terminal Box

4. Oil Pump Control Box

5. Swith Box

6. Air Vent

7. Pressure Gauge

8. Cool Water Pump

9. Cooling Water Pump

10. Cooled Water Pump Starter

11. Cooling Water Pump Starter

12. Cooling Tower Starter


Evaporator

Condenser

Pipelines and Connection Figure of Chilled Water System. Dunham-Bush, (n.d.).

1# Main Power Entering Starting Cabinet

2# From Switch Box to Cooling Tower

Starter

3# From Switch Box to Cooling Pump Starter

4# From Switch Box to Cooled Pump Starter

5# From Main Power to Oil Pump Control Box

6# From Starting Cabinet to Control Box

7# From Starting Cabinet to Main Motor

41


Flooded Shell-and-Tube Evaporator

The flooded shell-and-tube evaporators are used in chiller systems of Pantai Hospital. The

evaporator consists of a shell which is a large pressure vessel with a large number of tubes

compressed and inserted in it. However, the shell is not filled entirely with tubes. This is to maintain

the refrigerant level below the top of the shell so that liquid droplets settle down due to gravity and

are not carried by the vapor leaving the shell. If the shell is completely filled with tubes, then a surge

drum is provided after the evaporator to collect the liquid refrigerant.

At this stage, heat is transferred from the relatively warm water to the refrigerant, causing the

liquid refrigerant to boil and resulting vapor. The refrigerant flows along the shell side to absorb heat

from the relatively warm water that flowing through the tube bundle. Then, fluid to be chilled flows

along the tube. It has passed through an eliminator to prevent liquid from being drawn upward. The

float valve which acts as float valve maintain the level of the refrigerant. In order to transfer heat

efficiently, a large heat transfer area should be used, leading to the use of many tubes. In this way,

waste heat can be put to use. This is an efficient way to conserve energy.


Evaporator component section diagram

42


Centrifugal Compressor

In the refrigeration cycle, the compressor is a pump which provides the work energy to move

the vaporized refrigerant from low-pressure region (evaporator) to high-pressure region

(compressor) through the system. It uses the principles of dynamic compression which involves

converting energy from one to another. This helps to increase the pressure and temperature of the

gaseous refrigerant from low pressure and cooled temperature to high-pressure and high-temperature

gas. Then, the refrigerant will be pumped to the condenser.

The type of the compressors in Pantai Hospital is the centrifugal compressor. This type of

compressors is normally used in large water chillers. It is low in sound level, low-cost and has great

reliability. Centrifugal compressors are generally available in prefabricated chillers from 100 to

3,000 tons [350 to 10,500 kW], and up to 8,500 tons [30,000 kW] as built-up machines.

√


Centrifugal Compressor Section Diagram

Rotating impeller is the core component of the centrifugal compressor. The rotation of the

impeller increases the velocity and kinetic energy of the refrigerant vapor. Centrifugal compressors

use 1 or more impellers to increase the pressure of the refrigerant. After the accelerated refrigerant

vapor leaves the last impeller, it collects in the compressor volute and transfers to the condenser.

Part of the Centrifugal Compressor.

TRANE, 2012.

Multistage compressor. TRANE, 2012.

43


Water-Cooled Condenser

A Water-Cooled Condenser is a heat exchanger that rejects the heat of refrigerant, it converts

gas to the liquid flowing through it.

After compress into high-pressure and hot temperature, the vaporized refrigerant is then

discharged from the compressor into the condenser. In the water-cooled condenser, water is pumped

through the tubes while refrigerant vapor fills the shell space surrounding the tube bundle to transfer

the refrigerant vapor to water. After the heat transfers from the hot, high-pressure refrigerant vapor

to the water, refrigerant condenses on the tube surfaces. There has a baffle inside the condenser

which helps distribute the refrigerant evenly. Then, the condensed liquid refrigerant will continue

flow through the expansion devices and economizer.

An economizer can be used in conjunction with multiple expansion devices to improve the

efficiency of a multi-stage chiller. Before entering the evaporator, the liquid refrigerant from the

condenser flows through the expansion device that reduces its pressure and temperature to

evaporator conditions.


Water-Cooled Condenser Section Diagram

Economizer. TRANE, (1012).

44

Expansion Valve

Expansion Valve helps liquid refrigerant lower the pressure before flowing through the

evaporator which changes the state from liquid to gas. Additionally, the heat is not removed from the

valve, only the pressure has been lower down. At this time, the refrigerant is at its coolest when it

leaving the expansion valve to enter the evaporator.

3.3.2.2 Chilled Water Pump

The water pump is located in the basement along with the chiller. The pump set is to keep the

pressure in the chilled water network constant and to channel the chilled water from the chillers to

the cooling tower. All the pumps will be working based on the reading from the differential pressure

sensor placed between the header supply and return lines. When one pump is running at full speed

another pump will be turned on and its speed is increased so that the pressure difference setpoint is

achieved. The pumps are operated in a sequence, the pump that has been running the least should

become the pump that is turned on first, and so on.


Expansion Valve Section Diagram

Chilled Water Pump, Pantai Hospital

45


3.3.2.3 Variable-Air-Value System (VAV)

A variable-air-volume (VAV) system varies the quantity of constant- temperature supply air

in response to the changing cooling load in the space.

Each conditioned space, or zone ( a group of similar spaces) in Pantai Hospital has a separate

VAV terminal unit that delivered the different quantity of supply air to that space or zone. A

thermostat will compare the dry-bulb temperature in the conditioned space to a setpoint. It then

modulates the quantity of supply air needed to be delivered to space by changing the position of the

airflow modulation device in the VAV terminal unit to maintain a constant supply air temperature.

3.3.2.4 Air Handler

The central air handler for Pantai Hospital is installed in a dedicated mechanical room. The

return-air dampers draw the return air from the space into the unit and mixes with outdoor air that

enters through another set of dampers. This mixed air passes through the filters, the supply fan, and

the cooling coil before being discharged from the air handler.

Central Air Handler Source: TRANE, (2012)

Variable- air-volume system. Source: TRANE, (2012)

46


3.3.2.5 Supply Air Distribution System

Supply air distribution system is used to distribute the supply air from the central air handler

to the conditioned spaces. There are a central air handler and ductwork to deliver supply air to

multiple VAV terminal units. From each unit, the supply air travels to the diffusers through a section

of flexible duct. Diffusers are used to direct the supply air effectively to the conditioned space.

There are a wide variety of environmental conditions required in various departments for

hospitals. For example, the operating suites of Pantai Hospital must have clean supply air which

filtered through high-efficiency filters and needs a high airflow rate. Additionally, air will not

recirculate from patient's rooms so individual fan-coil units are combined with a small central

ventilation system which provides makeup air for exhaust. Then, offices, public areas, cafeterias,

shops and other support areas of Pantai Hospital also had taken a proper air diffusion into

consideration to avoid dumping cold supply air on the occupants of the space.

Supply Air Distribution System. Source: TRANE, (2012)

3.3.2.6 Ceiling Plenum Return

Ceiling plenum is a separate space provided for air circulation for heating, ventilation and

air-conditioning. It typically located between the ceiling and the roof, or floor. Air returns from the

conditioned space to the central air handler through an open ceiling plenum. Alternatively, a

separate return-air duct system could be used to direct the return air back to the air handler. Pantai

Hospital is using the open ceiling plenum.

Supply Air Distribution System. Source: TRANE,

(2012)

47


3.3.2.7 Cooling Tower

The cooling tower is located at the rooftop, used to cool down the water that absorbs excess heat

leaked from the compressor and condenser. It may either use the evaporation of water to cool down

or reply solely on air to cool down. When water flows through these components some water gets

evaporated, to make up this loss some water is also added in the cooling tower.

3.3.2.7.1 Main component of Cooling Tower

Firm Fill

Firm fill is also known as wet deck, made out of PVC. The purpose of the fill is to maximize the

contact between air and water to enhance evaporation process. The fills are covered in textured

pattern to leave spaces for water and air to channel through.

Cooling Tower, Pantai Hospital(2016) Cooling Tower Section Diagram

Firm Fill close up, Pantai Hospital(2016)

48


3.3.2.7.1 Main component of Cooling Tower Cont’

Louvre

Louvre are build to retain circulating water within the tower and to ensure the equality of air flow

distribution into the fill.

Cooling Tower Fan Motor

Explosion proof motors are preferred for use in Petrochemical & Refinery cooling tower

applications. As the Hot Cooling water from exchangers may have explosive gas if a heat exchanger

is leaked. Motor is to be provided with Protection systems like Earth fault relay.

Fan Motor above the cooling tower, Pantai

Hospital(2016)

Louvre around the cooling tower, Pantai

Hospital(2016)

Cooling Tower Fan Motor, Pantai Hospital, 2016

49


Drift Eliminator

Drift eliminators are installed above the distribution system, designed to capture large water

droplets caught in the cooling tower air stream, the cooling tower very have leaked vapour ascending

towards the fan, the play of eliminators is to help lower down the chance of water droplets and mist

from escaping the cooling tower. The drift eliminators are made by PVC. More passes through the

drift eliminator will decrease the amount of drift loss while also increasing the pressure drop which

increases the fan power consumption.

Water Distribution System(Nozzle)

Nozzles are manufactured using PVC to prevent corrosion and clogging, it is used to provide

uniform distribution of hot water inside a cell of a cooling tower.


Drift Eliminator, Pantai Hospital, 2016

Sample of Nozzle photo

50



Cooling Tower Fan

Cooling Tower is the largest component in the cooling tower, it is out of hot-dipped galvanized steel,

Glass Fiber, (FRP) Fiber Reinforced Plastic, and Aluminum. It plays one of the most important role

in cooling down water and distribute heat evenly. In this case, tropical country, the pitch of the fan

blade are higher than four season country to enhance the cooling performance.

Cold Water Basin

Cold Water Basin is the main part of cooling tower, constructed with Reinforcement Cement

Concrete. It act as a storage and capture cold water in the tower. Also, cold water basin is the

foundation of cooling tower itself in the cycle. The water are treat with special chemical to avoid

corrosion and mudding in the cooling tower.

Cooling Tower Fan, Pantai Hospital, 2016

Cold Water Basin, Pantai Hospital, 2016

51



Distribution Valve

Distribution Valve helps distribute hot water in the cell evenly, the pressure in the valve are low.It is

manufactured to be corrosion resistant.

Water Distribution Pipes

Water distribution pipes supported by different bars on ground to avoid thrust loading of the tower

due to self weight and water pressure inside the pipe.

Distribution Valve, Pantai Hospital, 2016

Water distribution pipe, Pantai Hospital, 2016

MS 1525: 2014

8.8 The system design should provide means for balancing the air and water system such as but not

limited to dampers, temperature and pressure test connections and balancing valves

52


3.3.2.8 Water Treatment

Consider the performance of the cooling tower, every cooling tower must have a water

treatment program to prevent corrosion, bacteria prevention and freeze protection. Fouled or

corroded tubes can reduce chiller efficiency and lead to premature equipment failure.

3.3.2.9 Active Chilled Beam System (ACB)

The function of Active Chilled Beam System(ACB) is to boost the cooling efficiency in the

tower.. ACB contains an integral air supply which induce air from space up through cooling coil.

This process allow ACB to provide much more cooling capacity. ACB can be use in Pantai Hospital

easily because Pantai Hospital is using Chilled-Water System which has the same media base as

ACB. Since ACB systems are designed to deliver less primary airflow, the primary air system

typically has little or no capacity for airside economizing. A VAV system, however, can provide up

to 100 percent of design supply airflow for cooling, when outdoor conditions permit. This system is

installed at spaces where it is completely enclose and air-conditioned..

Active Chilled Beam Section ACB Installation, Pantai Hospital, 2016

53


3.3.2.10 Air Duct System and Pipe System

Cooled air is distributed into every zone of Pantai Hospital by the duct system. The galvanized

steel ducts are used for the hospital because of its good insulation property. It helps keep the air

remain its low temperature while being transfer to the diffuser. Blower fan will be installed within

the ducts to circulate the air movement. Besides, the pipe system is used to transport the cool water

for the cooling coil to cool the air which will be distributed to the spaces of Pantai Hospital through

the diffusers.

Air Duct System and Piping System. Pantai Hospital

MS 1525:2014

8.5 All piping installed to serve buildings and within buildings should be adequately insulated to

prevent excessive energy losses. Additional insulation with vapour barriers may be required to

prevent condensation under some conditions.

8.6 All ducts, plenums and enclosures installed in or on buildings should be adequately

insulated to prevent excessive energy losses. Additional insulation with vapour barriers may be

required to prevent condensation under some conditions.

8.7.3 Automatic or manual dampers installed for the purpose of shutting off outside air intake

for ventilation air should be designed with tight shut-off characteristics to minimise air leakage

54


3.4 Conclusion

In conclusion, air conditioning which often referred as air con or A/C is the process of altering

the properties of air like temperature and humidity to more favorable conditions by cools, (or heat),

cleans, freshens the air and controls its moisture content simultaneously. This helps hospitals to

provide a comfortable environment to the occupants especially patients. The doctors and staff will

also be able to work more comfortably and concentrate on their duty in a better manner.

There are various types of air conditioning systems for different applications such as the

centralized air conditioning system, the district cooling system and the chilled beam system. As

Pantai Hospital is a huge high-rise building, it utilizes the water system which the system uses

chilled water to transport heat energy between the airside, chillers and the outdoors for efficiency

and economic advantages. The centrifugal water chillers include the evaporator, compressor,

condenser and expansion device. Due to the units being placed in the isolated area of the floor or on

top of the building, there is minimum noise production which suits the requirements of the hospital.

Pantai Hospital Kuala Lumpur compiles with the by-law in terms of air distribution. Air

conditioning system has helped in making the environment of the Pantai Hospital livable and

comfortable. It also helps in keeping the environment of the hospital clean and hygienic. The rules

and regulation that they had achieved are :

UBBL-SECTION 41(3) : The provisions of the Third Schedule to these By-laws apply to

buildings which are mechanically ventilated or air-conditioned.

MS 1525:2014 (8.2.1): Air conditioning systems and equipment shall be sized to provide no more

than the space and system loads calculated in accordance with 8.1 above, consistent with

available equipment capacity. Redundancy in the capacity of equipment, if incorporated into

the sizing of the duty equipment, should include efficiency devices such as variable speed

drive, high-efficiency motor, efficient unloading devices, multi compressors etc. so as not to

diminish the equipment/system efficiency when operating at varying loads.

MS 1525:2014 8.2.2 Where chillers are used and when the design load is greater than 1000 kWr,

a minimum of either two chillers or a single multi-compressor chiller should be provided to

meet the required load.

MS 1525: 2014 (8.8) The system design should provide means for balancing the air and water

system such as but not limited to dampers, temperature and pressure test connections and

balancing valves

55

4

MECHANICAL

VENTILATION


CONCLUSION

by

LOONG BO LIN

TAN JINGWEI

4. MECHANICAL VENTILATION SYSTEM

4.1. Introduction

Ventilation is commonly used to control indoor air quality by diluting and displacing indoor

pollutants. Outdoor air is brought into an enclosed space or an indoor space, and it is distributed

within the space. Besides from diluting the pollutants originating in the indoor space, ventilation in

indoor spaces also provides healthy air for breathing. Ventilation can also be used on thermal

comfort purposes or dehumidification by bringing in outside air to achieve desired indoor

psychrometric conditions. In another word, ventilation can make a huge difference on the

temperature inside an indoor space, it can reduce heat inside an indoor space and provide a cooler air

and provide comfort for the user of the space.

The intentional adoption of the outdoor air can be categorized into either natural ventilation or

mechanical ventilation.

4.1.1. Natural Ventilation System

Natural ventilation is the passive air flow of the outdoor air into an indoor space through designated

openings, such as louvers, windows, doors and etc. Natural ventilation does not require mechanical

component to force air flow from outdoor, it totally depends on passive physical phenomena, such as

wind pressure, velocity, thermal buoyancy force, diffusion, stack effect and etc. Natural ventilation

also depends on climate, building design, human behaviour and etc.

4.1.2. Mechanical Ventilation System

Mechanical ventilation basically uses fans to drive the flow of outdoor air into an indoor space by

pressurization or extracting the indoor air to outside by depressurization. Pressurization can be done

in the case of positively pressurized buildings, while depressurization can be done in the case of

exhaust ventilation systems. In other words, mechanical ventilation works either on supplying air

into an indoor space, or extracting air from an indoor space to the outside. Most mechanical

ventilation combined them both to achieve the desired diluting or cooling effect.

Natural ventilation system. Source: Bilco,

Kenilworth Media Inc., (2017).

Natural ventilation system. Source: American

Institute of Architects, (2012).

57


4.2. Report Review

The mechanical ventilation system can be categorized into various type of system. The three

categories of the mechanical ventilation system are the supply ventilation system, the extract

ventilation system and the balanced or combined ventilation system.

4.2.1. Supply Ventilation System

The supply ventilation system is a system with mechanical inlet air and natural air extract. The

outdoor air is forced into the indoor space mechanically by using fan, pressurizing the indoor space.

While the air leaks out from the indoor space naturally, it can be leak through the holes in the shell,

bath, range fan ducts and existing intentional fan.

The supply ventilation system has a fan and duct system, it may include adjustable window or wall

vent s in other room. Yet, this system is inexpensive and simple to install. In some sense or cases,

this system is better than an exhaust system since it allows a better control of the air that enters the

indoor space than the exhaust system do. The supply system minimizes the outdoor pollutants in the

indoor spaces. It prevents backdrafting of combustion gases from fireplaces and appliances. It also

allows outdoor air that is introduced into the indoor spaces to be filtered in order to remove pollen

and dust or dehumidified. This step is carried out in order to ensure and provide the humidity

control.

Supply ventilation system. Source: U.S.

Energy Department, (n.d.).

58


The supply ventilation system pressurizes the indoor spaces, hence it has a potential to cause

moisture problem in cold climate. During winter time, this system can cause warm indoor air to leak

out through the random openings in the exterior walls and ceiling. If the indoor air is humid enough,

moisture may condense in the attic or cold outer parts of the exterior walls, resulting in mildew,

mold and even in decaying. In other words, this system works best in hot and mixed climates.

4.2.2. Extract Ventilation System

The extract ventilation system works by depressurizing the indoor spaces. It exhaust air from the

indoor spaces while make up for the infiltration of air through leaks in the building shells and

intentional passive vents.

Same with the supply ventilation system, the exhaust ventilation system is also simple and

inexpensive to install. This system consists of a single fan connected to a centrally located, single

exhaust point of in the indoor spaces. There might be a better designated exhaust system which is by

connecting the fans to ducts from several rooms where the pollutants are generated, such as

bathrooms. Passive vents through windows or walls can be installed adjustably in other rooms to

introduce fresh air rather than rely entirely on leaks in the building envelope. Passive vents may

require a larger pressure differences than those induced by the ventilation fan to work properly.

Yet, this system may brings in a concern on the pollutants that it might draw in along with the fresh

air, including the radon and mold from a crawl space, dust from an attic, fumes from an attached

garage, flue gases from a fireplace or fossil-fuel-fired water heater and furnace. These pollutants are

a particular concern when bath fans, range fans, clothes dryers are run when an exhaust ventilation

system is also operating.

Extract ventilation system. Source: U.S.


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The exhaust ventilation system does not temper or remove moisture from the make up air before it

enters the indoor spaces. As a result, it contributes to a higher heating and cooling costs compare

with energy recovery ventilation system.

In climate with warm and humid climates, depressurization can draw moist air into building wall

cavities, where it may condense and cause moisture damage to the building. Thus, this system is

most appropriate for cold climates.

4.2.3. Balanced Ventilation System

The balanced ventilation system is also known as the combined ventilation system. This system is

neither pressurize nor depressurize, if installed properly. It introduces and exhausts approximately

equal qualities of the fresh outdoor air and the polluted indoor air.

Usually, a balanced ventilation system has two fans and two duct systems, it could be said that it

actually is the combination of both supply and exhaust ventilation system. Due to the direct outdoor

air supply, some design uses single-point exhaust, since it allows the use of filters in order to remove

dust and pollen from outdoor air before entering the indoor spaces.

Fresh air supply and exhaust vents can be installed in every room, yet it is designed to supply fresh

air to the indoor spaces where the users mostly spend their time in, such as living rooms and

bedrooms. It also exhausts air from rooms where pollutants and moisture are mostly generated, such

as bathroom, kitchen and laundry room.

Balanced ventilation system. Source: U.S.


60


This system can usually be found or used in the cinemas, theatres, sport centers, basements, attic,

crawl space and etc. This system achieves slight pressurization in the indoor spaces by using an

extract fan which is smaller than the inlet fan, to prevent dust, draughts and noises. It can supply

fresh air and picks up stale air at multiple point.

Same with both supply and exhaust ventilation system, the balanced ventilation system does not

temper or remove moisture from the make up air before it enters the indoor spaces. Thus, it can also

results in contributing to higher heating and cooling costs. Like the supply system, the outdoor air

needs to be mixed with the indoor air before delivery in order to avoid cold air drafts during winter

time, of course when the uses are located in cold climate places.

This system is appropriate for all climates since it requires two fans and two duct systems. And also,

since it has two fans and two duct systems, it is usually more expensive to install and operate than

the supply and exhaust ventilation system.

4.2.4. Fan Coil Unit

Fan Coil Unit (FCU) is a simple device consisting of a heating and/or a cooling heat exchanger or

coil and fan. This system is used to control the temperature in the indoor spaces where it is installed.

This system can be controlled in two different ways, which is either by manual switch or by a

thermostat. The thermostat controls the throughput of water to the heat charger using a control valve

and the fan speed. This system can be commonly found in residential, commercial and industry

buildings.

Fan Coil Unit. Source: Veris Industry, (2017).

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4.3. Case Study

Pantai Hospital Kuala Lumpur uses the three types of mechanical ventilation as well as the FCU in

certain spaces. This is due to different functions, location and specifications of the spaces inside the

building/ The following shows the list of application of ventilation systems:

Fan Coil Unit (FCU)

Supply System

Exhaust System

Balanced / Combined System

4.3.1 Fan Coil Unit (FCU)

In Pantai Hospital, the fan coil are located in the parking lots. The fan coil unit (FCU) is a device

which consists of a heating and cooling coil and fan. It acts as a mechanical ventilation system that

control and regulate the temperature in the space where it's installed.

Due to their simplicity, fan coil units are more economical to install than ducted or central heating

systems with air handling units.

Foil Coil Unit (FCU) installation (As similar to Pantai Hospital)

The FCU at the Pantai Hospital uses a two-pipe fan coil unit. This consists of one supply and one

return pipe. As Malaysia’s climate is hot and humid, the supply pipe supplies cold water to the unit

all the time of the year. The FCU at the commercial area are concealed and installed at the ceiling

void.

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4.3.2 Supply Ventilation System

Pantai Hospital uses pressurized system in staircase. Pressurized system is used to prevent smoke

leaking passed closed doors into stairs by inserting clean air into the stair enclosure. The

pressurization of staircase work as the fan located at the top of the staircase push the air through the

gaps around the door.

When there’s a fire, clean air from outside is forced by the Stair Pressurized Fan into the stairwell.

The pressurization is used to push back smoke, keeping the smoke out of the escape route.

The section of a typical pressurized system stairwell.

(As similar to Pantai Hospital)

Source: (“Building Operation WebHelp”, 2016)

According to UBBL 1984 Clause 202 : Pressurized system for staircases

All staircases serving building of more than 45.75 meters height where there is no adequate

ventilation are required shall be provided with staircase pressurization system designed and

installed in accordance with MS 1472.

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The pressure relief damper installed on the wall near the staircase.

The fire rated doors can be found at each level of the building.

The door will affect the pressure and causes it drop when opened, sufficient air supply is needed to

ensure the pressure remains as same to prevent the entry of smoke.

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4.3.3 Exhaust Ventilation System

The exhaust ventilation system in Pantai Hospital is used in the parking. The parking area at the

hospital has partial natural ventilation due to the absence of some walls, therefore it uses the

exhaust-only ventilation. The exhaust system is responsible to extract the stale air and harmful gases

from vehicles through ductwork. Fresh air is the natural replaced through the openings at the

parking.

The ductwork at the car park are evenly distributed out, connected with mechanical extraction at the

end. As the air condition underground is usually hot, humid and stuffy, the exhaust ventilation

system helps to remove the air out. The ductwork connect from the internal part of the carpark and

direct outwards to the entrance and exit of the basement to expel of air.

A lower level extraction point is also found at the parking, mainly for extraction of carbon monoxide

and other pollutant gases. The extract of air is run by the fan room which is located at the end of the

parking area.

The low extract point that found in the carpark..

The space in the basement carpark where the

aluminum ductwork can be spotted.

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4.3.4 Smoke Spill System

Smoke control of a building is important in order to proceed emergency evacuation during fire.

Smoke Spill System is also known as Smoke Extract Ventilation System, this system is protected via

the passive fire protection system. This system will be used when a fire happens. It is used to

remove smoke from the building to enable emergency evacuation and also to improve firefighting.

The Pantai Hospital Kuala Lumpur has a properly constructed smoke spill system which is able to

sustain smoke free circumstances at all occupied levels. Hence, the possible risk of smoke

inhalation, injury and death can be reduced to the least amount.

Smoke Management System, Ceiling Jet Smoke Flow Pattern.

Source: National Research Council Canada, (2000).

The smoke exhaust system built on top of the

roof of the Pantai Hospital KL.

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4.3.5 Combined Ventilation System

The kitchen and motor room at Pantai Hospital uses the combined ventilation system due to the

absence of openings in the spaces, hence no natural ventilation.

Ventilation needs to constantly be under control for proper operation of the machines. The lift motor

at Pantai Hospital has no openings. If the space gets overheated it will affect the operation of the

equipment and controls. Therefore, the room uses the combined ventilation system consisting of an

exhaust fan and make-up air for continuous cooling of the room. In addition, the room also uses a

split air conditioner for maximum cooling of the space.

Extract fan in the lift motor room.

Supply air grille in the lift motor room.

According to UBBL 1984 Clause 41 : Mechanical ventilation and air conditioning

Windows and openings allowing uninterrupted air passage are not necessary if the room are

equipped with mechanical ventilation or air conditions.

In case of air-conditioning failure, there should be alternative way to introduce fresh air into

the room within half an hour.

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4.3.6 Components of the Ventilation System

The mechanical ventilation system consists of few important components to help the system to work

as desired. The components are:

a) Fan

b) Ductwork

c) Diffuser, Grille

d) Fire damper

e) Filter

4.3.6.1 Types of Fan

Fan is important device for impelling air through inlet point or ducts, forming part of the distribution

system. Fan is crucial to circulate indoor air when the indoor air is cooler than the outer air. Rate of

gaseous exchange relies solely on effective air movement. Therefore, fan is essential to draw air

from the interiors without natural ventilation. There were two types of fans found within Pantai

Hospital Kuala Lumpur which includes axial fan and propeller fan.

4.3.6.1.2 Axial Flow Fan

An axial fan is a compressor that increases the pressure of the air flowing through it. The blades of

the axial flow fans force air to move parallel to the axis where the blade rotates.

Axial fan is used for high flow rate. They are mainly used in simple extraction or cooling

applications with low system resistance, such as moving air from one large space to another. Axial

fan works in conjunction with the centralized mechanical ventilation system. It extracts hot air from

the basement and channels it to the centralized system through a series of ductwork. Axial fan

extract air work efficiently under low pressure. Therefore, it’s chosen in the basement.

Axial Flow Fan Components

Source: Choudhury, "Fans In Thermal Power Plants", (n.d.).

Axial flow fan at the basement carpark.

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4.3.6.1.1 Propeller Fan

Propeller fan is a great device in freeing air discharge from wall and windows. Propeller fan is

commonly used in residential and commercial buildings without ducting. On the other hand,

propeller fan allows large volume of air to the exterior but not allowing air to be force through a

long duct because of low pressure. Propeller fan works better under a small area and its well-known

for economy friendly, ease of installation and low noise level.

Propeller fan can be found in small enclosure room.

Propeller fan can be found in the motor lift room.

According to MS 1525 Code 8.4.1: Temperature Control

Each system should be provided with at least one thermostat for the regulation of temperature.

Each thermostat should be capable of being set by adjustment or selection of sensors over a

minimum range of between 22c to 27c. Multi-stage thermostat should be provided for

equipment exceeding 35/65kWr in conjunction with 8.2.4.

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4.3.6.2 Ductwork

Mechanical ventilation uses ductwork for air exchange. The required airflow includes supply air,

return air and exhaust air. As such, air ducts are one method of ensuring adequate indoor air quality

as well as comfort condition. The ductwork used is galvanized ductwork with fiberglass. Galvanized

steel is the most common material used in fabricating ductwork as it provides insulation. Poorly

designed ductwork may result in an opposite reaction, thus defeating its purposes and make air

quality worse. This will increases energy consumption by the machine, affecting building pressure

and having higher utility cost.

Ventilation ducts should not pass through smoke-stop or firefighting lobby less it be enclosed with

fire-resistant elements in which masonry is used or it be fitted with fire dampers. This is to prevent

fire from spreading into another room.

Normally, the ductwork system of carparks, kitchen, and toilets are separated. This is to prevent any

unnecessary foul smells from entering each other’s spaces.

Ductwork in the carpark of Pantai Hospital.

According to UBBL 1984 Clause 99: Cooking facilities in residential building

(2) Where a common vertical kitchen exhaust is provided, the riser shall be continued up

to a mechanical floor or roof for discharge to the open, and shall be constructed with

fire resisting material of at least 2 hours rating with BS476: Part 3.

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4.3.6.3 Supply Air Diffuser, Grille

Diffusers are designed for air supply and exhaustion in mechanical ventilation system. They are

located at the edge of the ductwork where the air is being supplied into the room. The construction

gives the possibility of air distribution in various amount and in one or more directions with the help

of ductwork. The grilles are mounted on a dropped ceiling or directly on the air duct system where

the supplied air is released to the room. They do not require any generation of power and are used to

slow the air’s velocity and to enhance its mixing into the surrounding. Diffusers at Pantai Hospital

are concealed to either the ceiling or wall.

Square air diffuser installed on the ceiling in one of the office.

Circular jet outlet taken at the lobby of Pantai Hospital.

According to MS 1525 Code 8.3.1: Separate Air Distribution System

Zones which are expected to operate non-simultaneously for more than 750 hours per year

should be served by separate air distribution system. As an alternative off-house control

should be provided in accordance.

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4.3.6.4 Return Air Grille, Fan

Air grilles and fans are designed to remove warm air from interiors at specific period of time to

prevent overheating. Grills installed are adjustable, allowing the person in charge to control the

amount of air going through and shut the room off so furance cannot pull air out out of it. A return

air grille is installed with a filter to trap smaller particulate materials preventing them to go through

ductwork. The limits of the amount of cleaning needed and keeps the system running smoothly,

reducing the risk of clogs caused by dust and other materials.

Return air grille that found in Pantai Hospital.

Return air grille that installed in the ductwork.

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4.3.6.5 Fire Damper

Fire Damper is a device installed to prevent the spreading of fire through walls or ducts from one

space to another. Upon detection of heat, the fire damper closes automatically, thus resisting the

passage of flames into other spaces. It also used to interrupt migratory airflow and maintaining the

integrity of the fire rated separation. Fire dampers are usually installed at compartment walls, where

it is at the point of duct penetration from one space to another. Even if the ductwork collapses, the

damper will still attached to the wall, maintain the integrity of the wall.

Containment fire and smoke damper with smoke detector.

Source: Hickey, L. (n.d.). Modulating Control of Fire &

Smoke Dampers in Smoke Control

Fire dampers found at one of the wall of Pantai Hospital.

According to UBBL 1984 Clause 156: Protected shafts as ventilation duct

(1) If a protected shaft serves as, or contains, a ventilating duct-

(a) The duct shall be fitted with automatic fire dampers together with or without

subducts as Australian Standard 1668: Pt. 1:1974, so constructed at such

intervals and in such positions as may be necessary to reduce, so far as

practical, the risk of fire spreading from a compartment to any other

compartment, or such other provision shall be made as will reduce such risk so

far as practicable.

(b) The duct shall not be constructed of, or lined with, any material which

substantially increases such risk.

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4.3.6.6 Filter

Filter plays a vital role as a component of the mechanical ventilation system. It is usually located

inside the ductwork or at the inlet grill, it is needed to filter the outdoor air before it is delivered into

the indoor spaces. Filtration is important to keep the air clean, especially for a building where the

health level come in as one of the major concern like Pantai Hospital Kuala Lumpur.

The filter trap and prevent the following components to enter the building:

a) Dust

b) Smoke

c) Bacteria

d) Radon and mold

e) Fumes

f) Fuel gases

Examples of viscous filter in mechanical ventilation system.

Source: M. Arkam C. Munaaim PhD, PEng, IntPE., (2009).

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4.5 Conclusion

In summary, mechanical ventilation plays an important role in ensuring good indoor air quality as it

will ultimately affect the health of the user in the space. Mechanical ventilation system is a necessity

to ensure constant air exchange within indoor spaces in order to remove pollutants, odour, and water

vapour trapped in interior spaces. Mechanical ventilation system can be categorized into 3 types,

supply ventilation system, exhaust ventilation system and balanced ventilation system. The system

applied in the spaces varies according to the function, size and the capacity of a room. Appropriate

mechanical ventilation system should be assigned correctly to prevent the wastage of energy, cost of

installation and maintenance. Constant maintenance should also be conducted regularly to prevent

energy loss which in result increases utility cost.

The Pantai Hospital Kuala Lumpur has a complete mechanical ventilation system which consists of

the supply ventilation system, exhaust ventilation system, balanced ventilation system, smoke

extract system and FCA with the working components which are the fan, duct system, diffuser and

grille, fire damper and filter. The indoor air circulation improved and the indoor temperature is

controlled in order to ensure the breathing quality and the health of the patients, staffs, visitors and

other users in Pantai Hospital Kuala Lumpur. Hence, the Pantai Hospital Kuala Lumpur achieved the

sufficient mechanical ventilation system in the building.

The Pantai Hospital Kuala Lumpur has achieved the following requirements and regulations:

According to MS 1525 Code 8.4.1: Temperature Control, each system should be provided with at

least one thermostat for the regulation of temperature. Each thermostat should be capable of

being set by adjustment or selection of sensors over a minimum range of between 22c to 27c.

Multi-stage thermostat should be provided for equipment exceeding 35/65kWr in

conjunction with 8.2.4.

According to UBBL 1984 Clause 99: Cooking facilities in residential building, where a common

vertical kitchen exhaust is provided, the riser shall be continued up to a mechanical floor or

roof for discharge to the open, and shall be constructed with fire resisting material of at least

2 hours rating with BS476: Part 3.

According to MS 1525 Code 8.3.1: Separate Air Distribution System, zones which are expected to

operate non-simultaneously for more than 750 hours per year should be served by separate

air distribution system. As an alternative off-house control should be provided in accordance.


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4.5 Conclusion

According to UBBL 1984 Clause 156: Protected shafts as ventilation duct, if a protected shaft

serves as, or contains, a ventilating duct-

a. The duct shall be fitted with automatic fire dampers together with or without subducts

as Australian Standard 1668: Pt. 1:1974, so constructed at such intervals and in such

positions as may be necessary to reduce, so far as practical, the risk of fire spreading

from a compartment to any other compartment, or such other provision shall be made

as will reduce such risk so far as practicable.

b. The duct shall not be constructed of, or lined with, any material which substantially

increases such risk.

In addition, according to UBBL regulation (UBBL 2012, Amendments on EE and MS 1525), each

mechanical ventilation system (supply and exhaust) might be furnished with a promptly open switch

or other means for shut off or volume decrease when ventilation is not required. The Pantai Hospital

Kuala Lumpur also achieved this requirement since most of the ventilation system inside the

building are connected to switches to let the user of the building to turn the system off when they are

not in use. Thus, by this current state of the mechanical ventilation system, the Pantai Hospital

Kuala Lumpur has achieved to become a sustainable building.


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5

MECHANICAL

TRANSPORTATION


CONCLUSION

by

ERICA CHIN CHING

5. MECHANICAL TRANSPORTATION SYSTEM

5.1 Introduction

A mechanical transportation system in a building is an energy-using service for the people

and goods to travel from place to place more efficiently, either vertically or horizontally.

Three common mechanical transportation systems are elevators, escalators and travelators.

5.2 Report Review

5.2.1 Elevator (Lift)

Elevator is an example of vertical transportation system, which is a mechanism that lowers

and rises the people or goods to different floors in a multi-storey building. Elevator provides

a vertical circulation for disables particularly in tall buildings. Generally, they are driven by

traction cable and counterweight systems such as a hoist or a hydraulic pump powered by

electric motor. Elevators are installed according to hoist mechanism, building height,

building type, elevator location and special uses.

5.2.1.1 Hoist Mechanism

a. Hydraulic Elevators

Also known as push elevators which are supported by a piston at a bottom of the

elevator that pushes the elevator up. The machine room are usually located at the

lowest level beside the shaft. The 2 main types are holed hydraulic elevators

(conventional) and hole-less hydraulic elevators.

a. Pneumatic Elevators

Pneumatic elevators are raised and lowered are controlling air pressure inside the

chamber where the elevators sits

Hydraulic Elevator Pneumatic Elevator

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c. Climbing Elevators

Climbing elevators are normally used in construction sites.

d. Traction Elevators

Traction elevators(pull elevators) are lifted by metal ropes which pass over a pulley

wheel attached to an electric motor above the elevator shaft. A counterweight is

usually existed in in traction elevators to increase efficiency. There are 3 main types

as follows :

- Geared Traction Elevators (the gearbox is attached to the motor which drives the

wheel that moves the ropes, travel speeds up to 500 ft/min)

- Gear-less Traction Elevators (Wheel is attached directly to the motor, travel speed up

to 2000 ft/min)

- Machine-Room-less Elevator (Compact machine, travel speeds up to 590 ft/min)

Gear-less TractionGeared Traction Machine Room-less

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5.2.1.2 Building Height

a. Low-Rise building (1 to 3 storeys) - Typically uses Hydraulic Elevator due to their

initial low cost

b. Mid-Rise building (4 to 11 storeys) - Typically uses Geared Traction Elevator

c. High-Rise building (12 storeys and above) - Typically uses Gear-Less Traction

Elevations

5.2.1.3 Building Type

a. Hospital Elevators

b. Residential/ Domestic Elevators

c. Agricultural Elevators

d. Industrial Elevators

e. Commercial Elevators

f. Parking Buildings Elevators

5.2.1.4 Elevator Location

a. Outdoor Elevators

b. Indoor Elevators

5.2.1.5 Special Uses

a. Handicap Elevators

b. Grain Elevators

c. Double-deck Elevator

d. Sky Lobby

5.2.2 Escalator

Escalator is another type of transportation that responsible to move vast amount of people in

a quick and efficent way from one floor to another. Escalator usually does not require any

waiting time like elevator does. It is more practical than elevator. Escalator usually takes the

form of moving staircases80


5.2.2.2 Configurations

5.2.2.3 Design Consideration

a. Vertical and horizontal distance to be spanned

b. Other building infrastructure

c. The location

d. Traffic pattern

e. Safety

f. Carrying capacity

5.2.2.4 Basic Components

Parallel Crisscross Multiple parallel

Escalators are positioned side by

side

Escalators that have one direction

circulation are ‘stacked’ hence it

minimised the space requirement.

A bank of 2 or more escalators with

differing directions

Vertical & Horizontal distance

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5.3 Case Study

The chosen site is the Block A of Pantai Hospital Kuala Lumpur (PHKL). It is an operating

administration office and commercial block of the building. The block consists elevators and

escalators for the convenience of the users there. There are 15 floors included basement in

this building. Ground floor is the commercial area and from 1st floor until 8th floor are the

specialist clinics. The administration offices are located from 9th to11th floors.

5.3.1 Elevators in Pantai Hospital

5.3.1.1 Position in Pantai Hospital Block A

Ground Floor Plan (NTS)

There are three(3) main positions of the elevator that can be identified from the ground floor

plan. Zone A and Zone B elevators are connected to the upper floors whereas the Zone C

elevators are linked to lower floors which are the basement carparks.

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a. Zone A

The elevators have access from the basement until the highest floor, the 11th floor.

The frequent users of Zone A are probably the staffs of the offices. Besides, Zone A

is also located nearer to the commercial area which convenient the staffs to grab some

foods during lunch time.

b. Zone B

The elevators have access from basement until the 8th floor only. The frequent users

are those who come to consult the specialists. Zone B also located nearer to the main

entrance and Zone C elevators which is much convenient for the users.

c. Zone C

The elevators can only access to the basement carparks. Zone C is located in between

Zone A and Zone B. The users could be the public users and the staffs.

UBBL 1984 clause 124

A lift shall be provided for non-residential building that exceed 4 storeys above or

below main access level at least one lift shall be provided.

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5.3.1.2 Grouping of Elevators

By grouping the elevators, it reduces the cost of installation. Due to its high number of

passenger elevators, they are usually grouped together instead of spreading up. There are few

kinds of grouping arrangement that are found in Pantai Hospital Block A. They are:

a. Single b. Four cars c. Five cars

From our observation, this

elevator is used to deliver

goods or medical wastes

From the plan we learnt that

this type of grouping is found

in Zone A and Zone C. The

human density from the

basement is distributed among

all Zones A, B and C.

According to what we

analysed is that these elevators

in Zone B have higher density

of public users. Furthermore,

it is also considered located at

the core of the circulation..

Hence, this group consist of

five cars.

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5.3.1.3 Types of Elevator

We were guided by those mechanical engineers of Pantai Hospital to the motor rooms. We

observed that there are 2 types of elevator’s motor in the same room. Through research, we

managed to identify the types of elevators by recognising a few features.

a. Identified Gear-less Traction Elevator Components

85


b. Identified Machine Room-less Elevator Components (MRL)

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5.3.1.4 Types of Elevator’s Door

There are 3 general types of elevator’s door which include two-leaf opening, two-leaf centre

opening and single-leaf side opening. From the observation through this site visit, we were

able to identified two (2) main types of elevator’s door. Those are :

a. Two-leaf Side Opening (provides wider entrance in proportion to width of shaft)

Zone C Elevator’s Door

Diagram shows how it works in a simplified way


87


b. Two-leaf Centre Opening

Zone A & Zone B Elevator’s Door

Diagram shows how it works in a simplified way

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5.3.1.4 Emergency

It is very essential that fire safety and emergency features should be included in the elevator

system. There are few fire safety and emergency features that we found at the elevator area

of Pantai Hospital Kuala Lumpur (PHKL).


a. Smoke detector b. Emergency Staircase Exit

UBBL 1984 clause 153 Smoke detectors for lift lobbies

(1) All lift lobbies shall be provided with smoke detectors.

c. Firemen Lift d. Emergency Alert

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5.3.2 Escalator in Pantai Hospital

5.3.2.1 Position in Pantai Hospital Block A

Ground Floor Plan (NTS)

The only set of escalators spotted in the building. It is located at the main entrance of

the Block A. It links ground floor to the 1st floor. First floor consist of specialist

clinics, endoscopy centre, health screening centre and the heart centre. These

escalators allow the people to have direct access to the upper floor and no waiting

time is needed.

5.3.2.2 Configurations

As there’s only one set of escalators is noticed, there’s only one configuration type is

found. The configuration of the escalators is parallel. The escalator on the left is for

going up and the right one is for coming down.

Escalators in PHKL

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5.3.2.3 Identified Components of PHKL’s Escalators

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5.4 Conclusion

Both the engineer and architects had worked well to create a great experience for the users by

providing transportation systems in order to let the users travel from one floor to another

safely and efficiently. Considering not only the efficiency of the access to different

mechanical transportation, the designers and constructors did thought about the choice of

technologies they will be using, leading them to lower the budget of maintenance and safety

of the system due to the long life-span of the system. Furthermore, the transportation system

also enhance the circulation of the building to an easy access which can reduce human

density in one place.

All transportation systems in Block A , PHKL

According to UBBL 1984 clause 124, for all non-residential buildings exceeding 4 storeys or

below main access level at least one lift shall be provided. Pantai Hospital Kuala Lumpur

(PHKL) has elevators going up until 11th floors and also elevators to the basement carparks.

This shows that the building has achieved the UBBL. Besides that, another law that was

taken under consideration by PHKL is the UBBL 1984 clause 153 (1), all lift lobbies shall be

provided with smoke detectors. In other words, PHKL building layout is approved lawfully.

To sum up, transportation systems in PHKL are definitely meet the requirement of UBBL

1984. Although we cannot say it is the best transportation systems, but it definitely is a good

design in terms of having few access to the upper floors.

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6

SUMMARYCONCLUSION

6. SUMMARY

6.1 Conclusion

Since the building (PHKL Block A) is newly built in year 2014, all the equipment of all the systems

stated in the case study are all relatively new and are in good condition.

For the fire protection system alone, the fire protection equipments are proper and new, they also

considered every aspect before they design the building layout plan, in order to avoid more possible

injuries and death, and also to ensure the progression of fire fighting will proceed smoothly when the

fire happens. PHKL has provide complete active and passive fire protection system which will be

needed when fire occurs.

As for the air conditioning system, PHKL has provided a complete system which helps in making

the indoor environment livable and comfortable. This system also helps to make the indoor spaces

clean and hygienic at all time. In other words, the air conditioning system is an essential system to

keep the indoor spaces of the hospital clean and healthy in order to ensure the health of the patients,

staffs, visitors and other users.

The mechanical ventilation system of PHKL is also complete and effective. The mechanical

ventilation system improve the indoor air circulation and the breathing quality of the patients, staffs,

visitors and other users, since the mechanical ventilation system is essential to filter and remove the

bacteria, pollutants, water vapour, odour and other unwanted elements in the air of the indoor spaces

of the hospital. By ensuring the system is effective, the health of the users is also ensured.

As for the mechanical transportation system, PHKL provides complete system for each of the lift

and escalator. The function of the system is always ensured in order to transport the users in the

hospital at all time, especially during emergencies. The safety of the users is also considered in this

system.

The completed systems stated above is designed considering the safety and health of the users at all

times. The maintenance of all of the systems and the equipments are always ensured in order to keep

the users in the hospital safe and healthy as the hospital is a place where health is one of the most

sensitive topic.Therefore, all of the systems above has achieved the requirements and rules and

regulation that is stated and required by the UBBL and also MS1525.

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6. SUMMARY

According to this case study report of the fire protection system, air conditioning system, mechanical

ventilation system and mechanical transport system in Pantai Hospital Kuala Lumpur (PHKL), we

acknowledge that the PHKL has achieved the following requirements and rules:

1) Fire Protection System (Active and Passive)

UBBL 1984 Section 248 : Marking on wet riser, etc.

UBBL 1984 Section 253 (2) : Emergency power system.

UBBL 1984 Section 155 : Fire mode of operation.

UBBL 1984 Section 237 : Fire Alarm.

UBBL 1984 Section 239 : Voice Communication System.

UBBL 1984 Section 227 : Portable extinguishers.

UBBL 1984 Section 228 : Sprinklers valve.

UBBL 1984 Section 153 : Smoke detectors for lift lobbies.

UBBL 1984 Section 169 : Exit Route.

UBBL 1984 Section 178 : Exist for institutional and other place of assembly.

UBBL 1984 Section 240 : Electrical isolating switch.

UBBL 1984 Section 162 : Fire doors in compartment walls and separating walls.

UBBL 1984 Section 168 : Staircases.

UBBL 1984 Section 172: Emergency exit signs.


UBBL-SECTION 41(3) : Mechanical ventilation and air ventilation.

MS 1525:2014 (8.2.1): Air conditioning systems and equipment shall be sized to

provide no more than the space and system loads calculated in

accordance with 8.1 above, consistent with available equipment

capacity. Redundancy in the capacity of equipment, if

incorporated into the sizing of the duty equipment, should include

efficiency devices such as variable speed drive, high-efficiency

motor, efficient unloading devices, multi compressors etc. so as

not to diminish the equipment/system efficiency when operating

at varying loads.

MS 1525:2014 8.2.2 : Where chillers are used and when the design load is greater

than 1000 kWr, a minimum of either two chillers or a single

multi-compressor chiller should be provided to meet the required

load.

MS 1525: 2014 (8.8) The system design should provide means for balancing the air

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6. SUMMARY

3) Mechanical Ventilation System

MS 1525 Code 8.4.1: Temperature Control.

UBBL 1984 Clause 99: Cooking facilities in residential building.

MS 1525 Code 8.3.1: Separate Air Distribution System.

UBBL 1984 Clause 156: Protected shafts as ventilation duct.

4) Mechanical Transportation System

UBBL 1984 Section 124 : for all non-residential buildings exceeding 4 storeys or below main

access level at least one lift shall be provided

UBBL 1984 Section 153 : Smoke detectors for lift lobbies

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7

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Case Study of Building Service in Public buildings

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