1ashraeqatar.org/.../ashrae_qatar_seminar_-_vrv_part.pdf · 2019. 2. 13. · DX Packaged VRV Air...
Transcript of 1ashraeqatar.org/.../ashrae_qatar_seminar_-_vrv_part.pdf · 2019. 2. 13. · DX Packaged VRV Air...
![Page 1: 1ashraeqatar.org/.../ashrae_qatar_seminar_-_vrv_part.pdf · 2019. 2. 13. · DX Packaged VRV Air cooled ChillerWater cooled Chiller Capital Cost (AED / TR)(AED / TR) 4000 5500 8500](https://reader035.fdocuments.net/reader035/viewer/2022070211/60fcdc46598f000eb709bd78/html5/thumbnails/1.jpg)
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- 2 -Limitations of Existing Solutions
RESIDENTIAL
COMMERCIAL
& OFFICE
Scale Conventional
Design
Small Size
Low Rise
Splits,
Multi Splits,
Packaged Units
Large Size
Mid/High RiseCHILLERS
Small Size
Low Rise
Splits,
Multi Splits,
Packaged Units
Large Size
Mid/High Rise
CHILLERS,
District Cooling
LIM
ITA
TIO
NS
!!!
Project Type
HVAC Typical Design Approach
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Typical use of HVAC systems
UnitDX Packaged VRV Air cooled Chiller Water cooled Chiller
Capital Cost (AED / TR) (AED / TR) 4000 5500 8500 9000 11500
Energy efficientcy (kW / TR) 2.1 1.8 0.9 1.5 0.7
Life span (Years) 12.0 12-15 20Plus 20Plus 25 Plus
Suitable Installtion range (Tons) 0 - 50 5 -100 30 - 800 200 - 1000 1000 - no limit
Pros
* Low First Cost
* Low Comfort requirements
*No emphasis or Enrgy use
* Low First Cost
* High Comfort requirements
*High Volume areas
* medium First Cost
* high Comfort requirements
* Excellent Energy savings
* medium First Cost
* high Comfort requirements
*service techs available
* Low runnign costs per TR
*huge loads satisfied
*specialised service
Cons
* small l ife cycle
* more maintenance / repairs
*can not be used for big
applications
* Large space for Ducts
* Roof openings
*No individual area controls
* High Capital cost
* technician training
* Freah air solution is l imited
* High First Cost
* NO small load use
* long project time
* High First Cost
* cooling towers & make up water
*not suitable for low loads
Use
Villas, single office block, stand
alon areas
Private areas -
Masterbedrooms, Big halls,
Multipurpose halls,
Warehouses,
Small Offices, Schools, Medium
rise, High rise,
Schools, Offices, Medium ot
High rise
District cooling, Big Shopping
malls, Hotels, High rise buildings,
Industrial use.
QR / TR
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residentialD
ire
ct E
xpan
sio
n
(DX
) Sy
ste
ms
➢ Higher Power Consumption
➢ Shorter productive life (10 years)
➢ No provision for standby
➢ No or limited Centralized Controls option
➢ Non Modulating Capacity Control (mostly on/off cycle only)
➢ Pipe Lengths limitations (up to 50m only)
➢ No Diversification of Loads possible (100% ratio)
➢ Low Comfort Levels (+/- 3 Deg C)
➢ Multiple Units - High Space Requirements– Higher Heat Generation
➢ High Sound Levels
➢ Limited Distance between indoor and outdoor
Design Limitations of Traditional DX Systems
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- 5 -Limitations of Existing Solutions
➢ Larger System Sizes➢ Low Part Load Efficiencies (minimum 25% compressor
unloading)➢ Standby capacity creation is expensive➢ No redundancy during break down➢ Shared Electricity – No direct billing.➢ Higher infrastructure costs – Transformer (85% loading only)/
foundations/ cables/ electrical panels/pump room➢ Third party supplied central controls➢ Specialized Maintenance Team – Higher cost➢ Multiple Suppliers / Points of Contact➢ Longer Installation Time➢ Phase Commissioning Not Possible➢ Non Scalable – Adding Capacity is Difficult➢ Limited Range of Indoor Units
Ch
ille
d W
ate
r Sy
ste
ms
Design Limitations of Traditional Applied Systems
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EFFICIENCY
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GCC Energy Efficiency Requirments
11.5 8.28
Saudi
T1 T3 T1
UAE Qatar Bahrein Kuwait Oman
11.6
8.19.5
6.84
9.5
6.84
10.4*
T1 T1 T1 T1 T1T3 T3 T3 48°C T3
6.8wall
ductestidama
EER [Btu/W]
9.5
6.848.5711.8 11.5
8.0
8.38.28
52°c
2 HoursT1 = 35° C
T3 = 46 °C
≠ Minimum EER
≠ Testing points
≠ Energy Labels
11.5
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HVAC SHARE IN ENERGY USE – Qatar
8
HVAC SHARE IN ENERGY USE – Qatar
Distribution electricity consumption – 2013 Distribution electricity consumption for a typical villa
RESIDENTIAL
48%COMMERCIAL
36%
INDUSTRY
15%
COOLING
HEATINGLIGHT
EQUIPMENTFAN
HOW TO REDUCE THE ENERGY USE?✓ Act on building performance (e.g.: insulation…)✓ Act on air conditioning efficiency
(Source: July 2017 / KS-2017-DP16)
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ENERGY CONSUMPTION SIMULATION
9
ELECTRICITY CONSUMPTION
EER
ESEER
SEER
OPERATION LOAD: DEPENDS ON OUTDOOR TEMPERATURE
EFFICIENCY CALCULATION METHOD
EQUIPMENT EFFICIENCY:
DEPENDS ON TECHNOLOGY
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EFFICIENCY REPRESENTATION
10
WHAT IS EFFICIENCY – WHY IS IMPORTANT?
▪ Energy Efficiency gives you an indication on how your system is performing.▪ The more efficient, the less energy use.▪ It is crucial to have a correct representation of efficiency to enable
selection of system that will save energy.▪ Several ways to represent efficiency:
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- 11 -11
EER ESEER SEERCONDITIONS
❶ ❹ FULL CURVENUMBER POINTS:
TEMPERATURE:
LOAD:
100% 100%
75%
50%
25%
EER indicates the
efficiency of AC 1
defined point (eg 46
or 35CDB)
ESEER indicates the
efficiency of AC
based on 4 points.
SEER indicates the
efficiency of AC over
the full temperature
distribution curve
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TEMPERATURE DISTRIBUTION CURVE
OCCURRENCE~ 1%
design point: 46CDBSource: airport weather data
100%
75%
50%
25%
HOT CLIMATE … BUT NOT ALL YEAR LONG!
OCCURENCE (COOLING) ~ 75%
ZONE TO ACT ON TO REDUCE
ACTUAL ENERGY CONSUMPTION
MOST FREQUENT TEMPERATURES
Normal
EER
High
EER
Part Load Efficiency
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EFFICIENT COOLING – ALL THE YEAR ROUND!
EXCELLENT SEASONAL EFFICIENCY, IN LINE WITH REAL LIFE OPERATING CONDITIONS
OCCURRENCE ~ 75%
ZONE TO ACT40.4
31.8
20.5
14,212.5
10,0
EER – VRV IV -10 HP
Seasonal EER – Inverter + VRT
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Available
cooling
capacity
Cooling
requirement100%
25%
46°30° 38°25°Ambient
Temperature
VRF operationVRV IV operation
Lo
ad
Variable Tr
Refrig
era
nt T
Effic
ien
cy
Lower capacity needed during mid
season
Fixed Tr
Ambient
Temperature
Fixed Tr
Ambient
Temperature
Variable Tr
Automatic adjustment of refrigerant
temperature depending on load and
weather
Adapting to required heat load by
Variable Refrigerant Volume
+28% ESEER
Design
point
46°30° 38°25°
46°30° 38°25°
How to increase Part Laod Efficeincy
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15
0°C
28°C
46°C
Temp outside °C
6°C
Refrigerant Temp°C Refrigerant Temp°C
6°C
13°C
Automatic change depending on Temperature Outside
VRF
Fixed Refr Temp
Result?• Higher efficiency
- 28% SAVINGS OVER A FULL YEAR
• Higher comfort
21°C
VRT Concept
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Cooling Capacity
Cooling Capacity
Power
Input
Power Input
Efficiency =Cooling Capacity
Power Input
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TECHNOLOGY
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VRV® (VRF) TECHNOLOGY
• Variable: The system responds depending on the required capacity.
• Refrigerant: Direct expansion system.
• Volume: The refrigerant volume is
regulated by an electronic expansion valve in each
indoor unit...
WHAT IS VRV®? –
DEFINITION &
How it works?
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INV INV
PCB
P
T
CPU
T T T
What is VRV? → VRV® concept indoor unit
VRV IV is Weather Compensating Air Conditioning
System
• Central DX system
• Possible to take diversity
• Excellent Part load Efficiency or IPLV
• Long pipe run up to 190 meters
• Wide variety of indoor units
• Tennant Billing
• Multi phase - Scalable
Smart HVAC – VRV/F solution
3 – 100 T.R.
Cooling Capacity
Liquid
Gas
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VRV – No Central Ducting
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Smart Zoning and Diversification
22°C
24°C
OFF
20°C
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VRV® Concept - INDOOR UNIT
What is VRV? → VRV® concept indoor unit
T1 = Inlet refrigerant temperature sensor (liquid)
T2 = Outlet refrigerant temperature sensor (gas)
T3 = Suction air temperature sensor
T4 = Set temperature from Remote controller air temperature
Suction
Dis
ch
arg
e
Plower speed
Liquid
Gas
Electronic expansion valve
(0~2000 pulses)
Eva
po
rato
r
T4
T1
T3
Blower
T2
CPU
Modulating cooling
capacity gives optimum
comfort
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Comfort - Temparture & Humidity Control
✓ VRV offer the best comfort via precise temperature and humidity control
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Air cooled
Radiator fins
Refrigerant cooled
Reliability - Refrigerant-cooled PCB
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Corrosion and Capacity
Higher GradePE Fin
ConventionalBlue Fin
Acid salt spray test for heat exchanger
300 hours 500 hours 1,000 hours 300 hours 500 hours 1,000 hours
No corrosion!After 1,000 hours of acid salt spray, definite
corrosion found on the surface
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VRV Outdoor Single - Mutli
➢ 8HP + 16HP
➢ 10HP + 14HP
➢ 12HP + 12HP
➢ 8HP + 8HP + 8HP
➢ 20HP
➢ 8HP + 12HP
➢ 10HP + 10HP
Single Combination (Multi)
(HP) 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 …… 96
VRV
Depending on Design priorities: ❖ Efficiency❖ Footprint
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High ambient model – Low Capacity Drop
Capacity derating at 46C compared to 35C
14
Tamb (°CWB)
indoor unit
Tamb (°CDB)
outdoor unit
-5
25 28
pu
ll d
ow
n a
rea
Cooling
55
pu
ll d
ow
n a
rea
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➢ Max. height difference o.u. – i.u.:
➢ Max. branch length:
➢ Max. actual piping length:
➢ Max. equiv. piping length:
➢ Max. total piping length
➢ Max. I.U – I.U height:
90m
90m
165m
190m
1000m
Note: There are limitations depending on connectable type of indoors, piping diameters etc. Always consult technical literature.
Piping rules
30m
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DESIGN TOOLS
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Software Tools
30
VRV CADWebxpress
VRV PRO Solutions seasonal simulator
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Energy Efficiency - Design
Roof Design
1000mm
1000mm
Space Planning:
1m2 =10TR foot print
1m2 = for service
Total = 2 m2 per 10 TR
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Proper Sizing
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Proper Sizing
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• Shading the outdoor unit from sun will improve unit performance in the summer. If necessary use overhang
• In areas close to water, avoid exposure to sea breeze. Use heavy anti-corrosion
• Avoid areas where sand can be blown in the unit use deflectors.
Outdoor Unit Location
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INSTALATION
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Energy Efficiency - Design
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Energy Efficiency - Design
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Energy Efficiency - Design
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Energy Efficiency - Design
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Energy Efficiency - Design
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Energy Efficiency - Design
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Energy Efficiency - Design
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Energy Efficiency - Design
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Energy Efficiency - Design
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CONTROLS
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Market requirements
46
Basic control possibilities
to advanced BMS systems,
My budget is limited so I
am looking for basic
control of my A/C
I want to integrate
the A/C into the
existing BMS system
I am looking for an
advanced centralized
control system
I am looking for
advanced energy
management
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Controls choice
Individual
ControlsThermostats
- Wired
- Wireless
Centralized
Controls- iTouch Manager
- iTouch Control
- Central Controller
BMS /
Network
Management
Controls- Bacnet Interface
- Modbus
- KNX
- LonWorks
Cloud Control
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Controls choice
Advanced package
Title - Internal use only48
Web browser interface
Cloud
Local functions in addition to performance & energy consumption visualization
Control of different sites from a single location
Automatic function for energy saving
Energy saving
Multi-site Control
Remote monitoring & control
Includes all the packages
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Centrelized Controls
iTouch Manager (iTM)
iTouch Control
Residential controller
Tablet Contoler
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Controls – Localized Solution
Concept of Mini BMS
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Intuitive user interface…
…with a virtual layout view…
All Functionsaccessible via touch…
Mini BMS
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52
Set Schedules and monitor ifenergy use is according to plan…
…and detect the originof energy waste
Visual overview indicates indoor units where energysaving is possible.
Smart energy management
Mini BMS
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53
Flexible
64 Groups
2560Groups
Modular concept foruse in medium…
…to largeapplications.
Mini BMS
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Power consumption of the outdoor units
Tenant A
Tenant B
Tenant C
Tenant D
kWh meter
DivisionCalculation
Done by ITM
Multi Tenant
Proportional Power Distribution
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Control parameter:Basic Monitoring & control
o On/Offo Mode o Setpointo Fanspeed & airflow directiono Room temperatureo Error codeo Filter sign
Advanced functionso R/C buttons prohibitiono Schedule (weekly)o Emergency stopo Simple interlock
3rd pty product integrationo Digital inputs
Stand Alone
Emergency stop Window contact
Examples:
INTELLIGENT TABLET CONTROLLER
Controls- Tablets – Localized Solution
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Daikin Cloud
Stand Alone
Remote cloud connection
Cloud connection
INTELLIGENT TABLET CONTROLLER
Daikin CloudService
Cloud connectivity STEP1
• Dedicated Light Commercial segment solution• Price competitive centralized controller• User-friendly and intuitive user interface
Concept
Clouds Solution
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Web Based Data Management
• Notification is sent to customer
• Technician dispatch arranged at minimum possible time
Airnet Control Center Local Service Office
All equipment listed
Monitored every minute – reported everyday in normal operation. In failure, immediately reported includes last 30
minutes data.
Summarized & Reported
(stored server, can be referred via web)
130 data
points
Error detected
Installation SiteNetwork Center
Continuous Monitoring
ContinuousData Transfer
ACC
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• All sensors, valves, actuators, and control
points are monitored 24/7 in the outdoor
and indoor units (aprx. 130 points)
• Over 80 different predictions for VRV can
be generated. Examples:
• Gas leak
• Thermistor failure
• Abnormal operation of expansion valve
• High compressor consumption
• Clogged filters
• Irregular high / low pressures
Predictive Maintenance
Leak in refrigerant circuit Avoiding compressor breakdown
Additional data and trends are also saved:• Running hours • Power input • Maximum and mínimum consumption
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Network Controls - Adapters
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➢ VRV indoors
➢ Ventilation
➢ Controls
VRV - Connections
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Thank you