EW Luan Nguyen

7/29/2019 EW Luan Nguyen

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s u s t a i n a b I l I t y

Consultant Defined System Parameters

PLANT REFRIGERATION CAPACITY 2,700 ton (9,500 kW)

CHILLED WATER DISTRIBUTION 12.2C Evaporator EWT 6.7C Evaporator LWT 37.2C Condenser LWT

31.7C Condenser EWT


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The First Step...The First Step...


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If one chiller is fault, remain 50% load ?

Chiller must be off 2 compressor when it is serviced,

proper evacuation of a refrigeration

system is practically impossible with

active chilled-water flow


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The Next Step...The Next Step...


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Evaluated Pumping Systems

Primary/Secondary System

Variable Primary Flow System

Conclusion: VPF proves best life cycle value

Fewer pumps

Reduced plumbing connections

Reduced electrical connections

Slight Increase in VFD costs

Greatly reduced pump operating costs


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Use Low Flow, Low Temperature,High Efficiency Systems

+/+/--$$

air handlers

+/+/--$$

+/+/--$$controls

chillers

+/+/--$$piping

~/~/$$

ductwork

~/~/$$

Earthwise can help the

owner not only reduce

first cost, it is also

saving operating cost

TheThe 3th3th Step...Step...


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8.0

ASHRAE Standard 90.1

C

hillerefficiency

,COP

6.0

4.0

2.0

0.0best

available

Centrifugal>600 tons

Screw

150-300 tonsScroll


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Cool More or Pump More?

Pump efficiency 70%

COP 0.7

Chiller COP 7.0

Chiller COP 10x the pump COP

Conclusion work your most efficientequipment harder


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How ?

Leaving condenser watertempature

Leaving Chilled watertemperature

Flow rates Towers

Pumps

Piping

Valve


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Do you want your building green


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Ashrae green guide

Page 169- Ashrae green guide


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Ashrae green guide

Page 170- Ashrae green guide


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M-Quay newsletter


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Show Me the Impact

Cooling towers

Cooling coils

Chilled pumps Condenser pumps

Chillers

Controls


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37.2/31.7/29

240 LPS

5.5C range

2.7C approach

60 hp

45 kW

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113 LPS

8C range

3C approach

30 hp

22 kW

Cooling Tower Performance

2x1800 tons 3x1000 tons

STD EARTHWISE


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lessons learned

Cooling Tower Performance

!Tower watershould be hot!

Towers should use

inverters!


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3unit ( 1standby)

Flow rate 205 L/S

Pump head 15 m

Pump efficiency 78.2%

Pump power 39 kW

Primary Chilled Water Pump

4unit ( 1standby)

95 L/S

22 m

81.5%

25 kW

EARTHWISESTANDARD


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5unit ( 1standby)

Flow rate 102.5 L/S

Pump head 29 m


Pump power 35 kW

Less pumps less space

Secondary Chilled Water Pump

STD

Total system flow : 411l/s vs 285l/s

NONE

EARTHWISE + VPF


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3unit (1standby)

Flow rate 240 L/S

Pump head 32 m


Pump power 94 kW

4unit (1standby)

113 L/S

22 m

81.2%

30 kW

In this installation:a 30% reduction in flow =nearly 50% reduction in condenserwater pumping energy consumption

Condenser Water Pump

STD EARTHWISE


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Chiller Energy

Capacity 2X1350 tons

LWT 6.7C ( DeltaT 5.5)

Power 2x785kW (0.58kW/RT)Capacity 2X1350 tons

LWT 5C ( DeltaT 8)

Power 3x557 kW (0.619kW/RT)

No lunch is free

Earthwise Chiller consume more 29kW

Standard

Earthwise


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System Power

Chil ler 2x785 kW

P-Chilled water pump 2x39 kW

S-Chilled water pump 4x35 kW

Cond water pump 2x94 kW

Cooling tower 2x45kW

Total 2066kW

Standard

3x557 kW

3x25 kW

0

3x30kW

3x22kW

3x634 = 1902 kW

EARTHWISE

kW/RT 0.765 0.70


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Chiller plant analyzer


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Monthly energy consumption

ALT1: Lef tALT2: Right


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Monthly energy cost ($)

Alternative Standard Earthwise Saving

Month $ $ %

Jan 44,250.60 37,004.50 16%

Feb 40,877.00 35,192.10 14%

Mar 51,121.40 44,361.90 13%

Apr 46,792.00 40,090.90 14%

May 51,351.20 44,232.60 14%

Jun 48,920.50 41,896.30 14%

Jul 43,512.10 37,673.90 13%

Aug 49,276.30 42,603.60 14%

Sep 42,338.30 36,906.30 13%

Oct 48,493.40 41,996.40 13%

Nov 46,157.40 39,835.90 14%

Dec 43,512.20 37,129.90 15%


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Annual cost

Saving

14%/yr

-

50,000.00

100,000.00150,000.00

200,000.00

250,000.00

300,000.00

350,000.00

400,000.00

450,000.00

500,000.00

$ $ $ $

Electric Water Electric Water

Standard Earthwise

Standard Earthwise

Electric Water Electric Water

$ $ $ $

556,602.38 11,141.40 478,924.31 9,407.40


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Chilled Water Plant Costs Estimated

Chiller's price is based on TraneVSDs price is based on Trane

Pump's price is based on Drunfos,

Cooling Tower is based on Ocean

the prices are not include piping, valves


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Compare prices with 2 alternative

Items STANDARD EARTHWISE STD ($) EWS ($)

Chiller 2x1350RT(0.58kw/RT) 3x900RT(0.619kw/RT) 1,200,000 1,250,000

P-Chilled water

pump3x205 l/s-15m(39kw) 4x95 l/s-22m(25kw) 47,000 40,000

S-Chilled water

pump5x102.5 l/s-29m(35kw) 0 70,000 0

Condenser water

pump3x240 l/s-32m(94kw) 4x113 l/s-22m(30kw) 115,000 48,000

VSD for chilled

pumps5x45kw 4x30kw 30,000 15,000

Cooling tower 2x1800RT (45kw) 3x1000RT (22kw) 120,000 100,000

VSD for Cooling

tower 0 3x22kw 0 10,000

Chiller plant control OtherTrane chiller plant

control0 40,000

Total chiller plant 2066kw 1902kw 1,580,000 1,500,000

System Kw/RT 0.765 0.7 - 80,000


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EARTHWISE SYSTEM

FIRST

COST

5%

OPARATING

COST

14%

1,580,000 $

1,500,000 &

567,743.00/yr

488,330.00/yr

This saving is not account for the reduction of piping, valves..


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Tranes chiller plant control

Your chiller system is

not optimal like our

analyzer without

chiller plant

control


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EarthWise Chiller Plant Control SystemFeatures and Benefits

Software Features

3-D animated system and equipment graphics

Energy monitoring & reports

System and equipment performance analysis

Web access

Energy Optimization

Advanced chiller sequencing

Cooling tower optimization

Variable primary chilled water flow control

Reliable & Flexible Operation

Matrix pump & cooling tower control

Auto equipment failure recovery

Auto equipment rotation

Alarm Management

Chiller diagnostic messages

SMS alarm notification

Factory Panel

Pre-wired and tested


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Energy OptimizationEnergy Optimization

Factory-engineered Optimization Algorithms Advanced Chiller Sequencing

Cooling Tower Optimization

Variable Primary Chilled Water Flow Control

Optimized based on Best System efficiency;

and NOT best equipment efficiency


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Advanced Chiller Sequencing

Results

Good chiller sequencing and chiller loading

CHILLER LOADING

30

40

50

60

70

80

90

100

TIME

%R

LA

CH-1

CH-2

CH-3

CH-4

CH-5

CH-6

5 10%chiller plant energy saving


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Energy Optimisation


But, Im tired Water is so cool, Im ok


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Energy Optimisation


Minimum chiller + cooling tower kW input

condenser water temperature, F

400

74

en

ergyconsumption,

kW

76 78 80 8272

300

200

100

084

tower

chiller

total

optimalcontrol point



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Scan and evaluate all AHU valves position every minute Reset pump speed according to satisfy most critical Fan coil

Fan coils should equip with modulating control valves

EarthWise Chiller Plant ControlSystem

P

Variable

speedpump

Fan coil with modulating valve

VFD

Energy Optimisation

Variable Primary Chilled Water Flow ControlEnergy Optimisation

Variable Primary Chilled Water Flow Control



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Connected with the other system

If you want to have a saving energy chiller system ,

you must have Tranes chiller plant control


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Conclusion

Use Earthwise concept help the owner savingboth first and operating cost

Remember that the meter is on the building,not on the chiller

The first cost saving is not account thereduction of piping, valve.

Use the innovative chiller plant control for

optimal HVAC system Tranes solution can help your building

greener


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Yeah!

Show me the references


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BITEXCO FINANCIAL TOWER

THE HIGHEST BUILDING IN HCM CITY

68 STOREYS

4 x 900 TONS R123

CENTRIFUGAL CHILLER

5-13oC; 37-45oC

YEAR: 2008-2009-2010


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Vincom Eden

Complex in HCMC

8x 1000RT

CenTraVac R123

Chiller

Year: 2009

5-13oC/ 32-39oC


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Crowne Plaza

InterContinential

5 Stars Hotel,

in Hanoi

4x 750RT

R123 Centrifugal

ChillerYear 2009

5-12oC/32-37oC


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Intel Viet Nam Factory- A9T9

4 x 2350 Tons

R123 Duplex Chillers +

AHU

Installation year: 2008-

2009

5-13oC on Chilled Side


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Centre Point Office

The 1st Green

Building in HCMC

R123 Chiller

3 x 450RT

Installation year :2008- 2009

5-12oC/32-37oC


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Sheraton NhaTrangHotel

3 x 700 Tons

Centrifugal R123

Chiller

5-12oC/32-37oC

Installation year :

2008-2009


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2x 250 Tons

RTHD

Water-Cooled

Screw Chiller

5-12oC/32-40oC

Year: 2009

Cuu Long

Commercial

Center in

Camau


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Questions orComments?

EW Luan Nguyen

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