Report on EnergyReport on Energy--Saving SurveySaving Survey · Chiller Plant Each Chiller COP has...

Report on EnergyReport on Energy--Saving SurveySaving Survey

Commercial Building WG24Commercial Building WG24

February February 21, 201121, 2011yy ,,

Yamatake CorporationYamatake CorporationYamatake CorporationYamatake Corporation

Table of Contents

1 Background and Objective

Table of Contents

1．Background and Objective2．Introduction of the Survey/Surveyed

CCompanies3．Survey Process4．Results

・Current Status and issuesCurrent Status and issues on Energy Efficiency

・Energy saving plan and its effect・Energy-saving plan and its effect5．Suggestions

All Rights Reserved, Copyright © GIPC 2011 2

BackgroundBackground

Targeted big potential of CO2 reduction

People’s livelihood partPeople’s livelihood

Growth rate from 1973 to 2005 2.1 timesCarrier

2.0times p p

Energy Efficiency Improvement

People s livelihood

1.0timesIndustry

1973 2005

HVAC ・Efficiency up of HVAC Power・Exclusion of wasteful energy use


Objective

Focused on

Objective

・Chillers replacement to high efficiency

・Introduction of BEMS instead of existing BMS- Visualization of energy performance- Infrastructure for Energy Efficiency operation

BEMS ； Building Energy Management System

・Introduction of energy saving application to theChill Pl t S tChiller Plant System- Chiller sequence control system

OthAll Rights Reserved, Copyright © GIPC 2011 4

- Others

Introduction of Surveyed CompanyIntroduction of Surveyed Company

Target building for survey UOB Alexandra BuildingTarget building for survey UOB Alexandra Building

Building Owner United Overseas Bank Ltd.

Type

Commercial Building *** At the beginning, it was a commercial building

with tenants, but now it was 100% occupied by UOB

Total space area 22,694 m2 25stories above and 1 under ground

Construction 1993

Chiller Plant Centrifugal chiller 4sets (550RT*2, 275RT*2)

Air Conditioners AHU 25 setsEquipped with VAV, FCU


Introduction of Survey CompanyIntroduction of Survey Company

CRUDE OIL (T) / M$-2000Y

450

400

350

$

300

250

200200

150

100

50

19731980

1985 50

0

19851990

19952000

2004


Summary of the surveySummary of the survey

Survey Process Result of the Survey

D d Chill ’ COP

Current Status Energy-Saving Plan and Its Effect

First Step(July 2010) for 4 days・Walk through in site for 4 days Chiller replacement・Decreased Chiller’s COP

・Aged sensor, no longer

reliable

・Walk through in site for 4 days

Second Step(Aug 2010) for 6 days

・Chiller replacement

・Installation of Energy Saving Application

reliable

・Balance situation of the

chiller’s ability and the air-

・Installs the measuring instrument・Installs the new type control valve to AHU

・Modification of AHU Control System

・BEMS installation instead of y

conditional load

・Aged VAV units

Third Step(July 2010) for 3 days・Removes the measuring

BMS

Energy Reductionand vane-motor for AHU

・BMS feature

ginstrument

Fourth Step(July 2010～Oct 2010)

gy760,000kW/Year

Electric fee Reduction167,000SGD/Year


(July 2010～Oct .2010)・Data analysis & writing report

167,000SGD/YearCO2 Emission Reduction

380 ton/Year

Survey Process （Summary）Survey Process （Summary）

ProposalAnalysisField Survey

From July 2010 to Sept. 2010Date

First Step (Jul/7 ～Jul/10 2010)

From Sept. 2010 to Oct. 2010

Data AnalysisCalculationComparison

First Step (Jul/7 ～Jul/10 2010)・Walk through in site for 4 days

Second Step (Aug/19 ～Sep/27 2010) Comparison

・Energy Consumption per each dayCOP (O ti ffi i f hill )

・Data Collection・Exchange the AHU control valve from existing one to new type that can

th i f AHU ・COP (Operating efficiency of chiller)・Change of Load frequency per each day・Change of chilled water temperature diff. between Inlet and Outlet of chiller

Action measure the using energy of AHU

Main Data Items1.Chilled Water Flow Rate in Plant (*3sets)2 El t i P i h Chill (*4 t ) between Inlet and Outlet of chiller

・Change of condenser water temperature diff. between Inlet and Outlet of chiller・Pump operation condition

2.Electric Power in each Chiller (*4sets) 3.Temperature･Chilled Water in Plant (*5sets)･Cooling water in each Chiller (*8sets)


・Pump operation condition･Cooling water for PAC (*2sets)

Survey Process （Detail）①Survey Process （Detail）①

Chilled Water Flow Rate in Chiller Plant

99All Rights Reserved, Copyright © GIPC 2011

Survey Process （Detail）②Survey Process （Detail）②

Electric Power in each Chiller

All Rights Reserved, Copyright © GIPC 20111010

Survey Process （Detail）③Survey Process （Detail）③Exchange the AHU control valve from existing one to new type that can measure the usingone to new type that can measure the using energy of AHU

As a control andAs a control and energy monitoring device


Current Status and issues of Energy Efficiency (Summary)(Summary)

ITEM Current Status and issues of Energy EfficiencyChiller Plant Each Chiller COP has decreased, so energy consumption has increased

Chiller Plant Load changes roughly in a day, so it is difficult to decide the operating chiller bChiller Plant numbers

Chiller Plant There is no balance of Chilled water between chiller plant side and load side, so there is waste in pump powerso there is waste in pump power

BMS Original BMS does not have data storage function, so it is impossible to compare the data

BMS Many local sensors are very old and not reliable

BMS Room temperature is local control, therefore no temperature feedback to BMSBMS

AHU Many VAV units are very old, so it is difficult to control room temperature

AHU Most of AHU vane motor to control the static pressure are very old and are


AHU p yfully opened and fixed, so there is waste in AHU power

Current Status and issues of Energy Efficiency （Details）①（Details）① Chiller efficiency

Power Efficien Chill (CH 1 2) COP d i 8/20 9/13Designa

tion

Refrigerator CapacityPower Input

Efficiency

COP

kW USRT MJ (kW) (kW/TR)

CH 1 1 936 550 6 970 328 3 6 5 9

Chiller (CH-1,2) COP　during 8/20～9/13

4.0

6.0

Val

ue

CH-1 1,936 550 6,970 328 3.6 5.9

CH-2 1,936 550 6,970 328 3.6 5.9

CH-3 968 275 3,485 179 3.6 5.4

0.0

2.0

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000

Load Calorie (MJ)

CO

P V

CH-4 968 275 3,485 179 3.6 5.4

Chill COP 20108/24

Load Calorie (MJ)

CH-1　Electric Power Consumption rate on20108/24

300

400

Chiller COP on 20108/24

5.0

6.0

7.0

e

0

100

200

300

7:0

0

8:0

0

9:0

0

10

:00

11

:00

12

:00

13

:00

14

:00

15

:00

16

:00

17

:00

18

:00

19

:00

kW

0.0

1.0

2.0

3.0

4.0

CO

P V

alu

1 1 1 1 1 1 1 1 1 1

Time7:0

0

8:0

0

9:0

0

10:0

0

11:0

0

12:0

0

13:0

0

14:0

0

15:0

0

16:0

0

17:0

0

18:0

0

19:0

0

20:0

0


Current Status and issues of Energy Efficiency （Details）②（Details）②

Chiller Load Frequency　(8/20～9/16)

40

Chiller load frequency

175RT 550RT

10

15

20

25

30

35

Count

0

5

1～5

6～10

11～15

16～20

21～25

26～30

31～35

36～40

41～45

46～50

51～55

56～60

61～65

66～70

71～75

76～80

81～85

86～90

91～95

96～100

Load (%)

141414


Current Status and issues of Energy Efficiency （Details）③（Details）③ Chilled water flow rate

2010/9/13 Chilled Water Flow Rate Data

700 0

300A　Flow rate 150A　Flow rate Bypass Flow rate

Secondary Pump Flow rate Primary Pump Flow rate

400.0

500.0

600.0

700.0

3/h)

0.0

100.0

200.0

300.0

Flow rat

e (m3

-200.0

-100.0

0.0

7:0

0

7:3

0

8:0

0

8:3

0

9:0

0

9:3

0

10:0

0

10:3

0

11:0

0

11:3

0

12:0

0

12:3

0

13:0

0

13:3

0

14:0

0

14:3

0

15:0

0

15:3

0

16:0

0

16:3

0

17:0

0

17:3

0

18:0

0

18:3

0

19:0

0

19:3

0

20:0

0

20:3

0

21:0

0

CH-1 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

CH-2 ○ ○ ○

CH 3 ○ ○ ○ ○ ○ ○CH-3 ○ ○ ○ ○ ○ ○

CH-4

Bypass flow, low Delta T

1515

Bypass flow, low Delta THigh Supply TemperatureHigh Flow

High consumption of pumps energy


Current Status and issues of Energy Efficiency （Details）④ AHU Control（Details）④ AHU Control


Energy-saving Plan and Its Effect (Summary）Energy saving Plan and Its Effect (Summary）

Expected Total Effect Proposals

E i Pl Eff

Chiller replacement

Energy-saving Plan Effect

30% reduction

(300 000kWH/year)

Estimated 13% reduction of total building energy Chiller replacement

Installation of Energy30% reduction

(300,000kWH/year)

E R d ti

g gyconsumption

Installation of Energy Saving Application (392,200kWH/year)Energy Reduction：

760,000kW/YearElectric fee Reduction：

4% reduction

(67,000kWH/year)Modification of AHU

control system167,000SGD/YearCO2 Emission Reduction：380 ton/Year

BEMS installation instead of BMS

Motivation of every person to energy

ti

380 ton/Year

More over, limitless energy reduction can be done by


instead of BMS conservationPDCA cycle through BEMS

Energy-saving Plan and Its Effect (Details） ①Chiller replacement and Chiller Numbers Control

Chiller operation numbers Chiller operation numbers is decided by

Chiller replacement and Chiller Numbers Control

550RT

is decided manually Chiller Plant Control automatically

Chiller Plant

550RT High efficiency High efficiency

Control

550RT High efficiency type 550RT

High efficiency

High efficiency type 175RT


275RT

275RT


type 175RT

275RT

The reduction of Man Power


The reduction of much electric power

Energy-saving Plan and Its Effect (Details） ②Installation of Energy Saving Application to Chiller Plant System

Cooling Tower

SecondaryPump

Condenser Water Pump

‐VSD control of primary pumps‐VSD control of secondary pumps‐ VSD control of condenser water

Primary Pump

Chillerpumps‐ Optimized condenser water temp. control for PAC


‐ Usage of remaining heat in the chiller plant

Energy-saving Plan and Its Effect (Details） ③M difi ti f AHU t l tModification of AHU control system

・Exchange the existing vane t l t t VSD t t lcontrol motor to VSD to control

static pressure・Exchange the VAV controller gwhich has communication function with AHU Controller・Exchange to the new type・Exchange to the new type control valve with measuring function

・AHU power consumption to be reduced・Measuring and monitoring of the room temperatures by the communication of each VAV controller


communication of each VAV controller・Restrain the exceed flow rate in AHU

Energy-saving Plan and Its Effect (Details） ④BEMS installation instead of BMS

Energy saving gy ginvestment

Energy saving infrastructure


BEMS is infrastructure for EE operation!

SuggestionsSuggestions

• Confirmed thing Cl ifi d th t ti l f th i i i ti ffi– Clarified the potential of the energy saving in existing office building

– Further energy saving can be done with lighting itemgy g g g

• Proposal To realize the energy saving, is it necessary to adopt BEMS thatcan visualize the energy performance as the building operationinfrastructureinfrastructure .Investment for BEMS is not the object of ROI.By the operation of BEMS, the trend of energy can be more grasped, y p , gy g p ,and investment for energy saving can be efficiently implemented.The popularization of the BEMS investment is the key that to expand


the energy saving in existing building

SuggestionsSuggestions

For Energy Savings…

ENERGY SAVINGS

View

OperationOperation

Maintenance


Contact ListContact ListIf you have interests in our survey, please feel free to contact to the following addresses.g

Name E-mail adrress Company

Kiritani Satoshi [email protected] Japan Yamatake

M T hihi t @ bil J Y t kMurayama Toshihisa [email protected] Japan Yamatake

Kurosaawa Shuuichi [email protected] Japan Yamatake

Takesako Masashi [email protected] Azbil Singapore


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