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Case study
GESP Project at The Treasury
Scope of Sharing
• Background
• ECMs
• Energy Savings
• Learning Points
Treasury Building
Treasury building
• GFA 47,047 sqm, 11 storey, office space from L2 to L11
• 6 Ministries and 2 Commercial tenants
• Occupancy – 1200 pple
• Daily visitors – 300 pple
• Average monthly electricity consumption – 649,484 (kWh)
(Before GESP implementation)
Treasury has been awarded :
•Energy Smart Office in 2007
•Green Mark Gold award in 2009
Why ?
• Treasury’s commitment To Reducing Carbon Emission
• FCM on Public Sector to take the lead on Environmental
Sustainability
GESP Tender
• Pilot energy saving project under the ED initiative using
Guaranteed Energy Saving Performance (GESP)
Contracting Services:• Investment cost by client / owner
• Energy Service Company (ESCO)
– Guaranteed the annual savings for a fixed period
– Guaranteed Return of Investment (ROI)
Milestones
• GESP tender was called in Jan 08
• Energy Audit conducted in Sep 08
• Implementation started from Jul 09
• Project completed in Feb 10
• Guaranteed annual saving commence in Apr 10
Project Cost and Saving
• Consultancy fee - $35K
• Investment cost - $1.3M
• Guaranteed annual saving of $260k per year
for 5 years - ROI of 20%
Energy Conservation Measures
(ECMs)
Energy Conservation Measures (ECMs)
• ECM 1 – Chiller system
• ECM 2 – AHU system
• ECM 3 – Mechanical Ventilation system
CHILLER SYSTEM CONFIGURATION (After GESP)
Site Implementation
ECM 1 – Chiller System
• Replaced the 650RT and 200RT chillers with new
efficient 700RT and 120RT chillers
• Replaced 4 sets of the chilled water pumps and 4
sets condenser water pumps
• Replaced 3 cooling towers’(CT) motors
• Provided common header of condenser water
•Provided Variable Frequency Drives(VFD) for all
pumps and CT motor with optimisation
New Efficient Chiller (Day)
• Capacity – 700RT
• Refrigerant – R134a
• Chiller Efficiency – 0.519 kW/RT
2. SITE IMPLEMENTATION
New Efficient Chiller (night)
• Capacity – 120RT
• Refrigerant – R410A
• Chiller Efficiency – 0.643 kW/RT
New Efficient Pumps
• Chilled Water Pumps
• Condenser Water Pumps
2. SITE IMPLEMENTATION
CIRCULATING PUMPS VFD
New Variable Frequency Drives for
• Chilled Water Pumps
• Condenser Water Pumps
2. SITE IMPLEMENTATION
COOLING TOWERS
2. SITE IMPLEMENTATION
• High efficient fan motor
and VFD control Cooling
Towers 1, 2 & 3
VFD
Efficient Motor
COMMON HEADERS FOR
CONDENDER WATER
• Cooling Towers 1, 2 & 3 at Roof Top
2. SITE IMPLEMENTATION
AfterBefore
• All chillers at B3 outside chiller plant room
2. SITE IMPLEMENTATION
• New Electro-Magnetic In-
line flow meter at Chilled
Water Return Header
• New Hi-accuracy
Platinum PT-100
Temperature sensors at
Chilled Water Supply &
Return header
• High Accuracy Monitoring Devices
POWER ANALYZER
• New 3 sets Power Analyzer
at Chiller Plant System
MCC incoming 1, 2, & 3
(2500A / 2500A / 600A)
2. SITE IMPLEMENTATIONS
ENERGEY CALCULATOR AND DATA
COLLECTOR
• Chiller Plant System efficiency calculator at
B3 chiller Plant room control room
• Continuous trend data collector at L1 BMS
room
Energy Master - Efficiency & Energy Monitoring
2. MONITORING DEVICES
Basement 3 – Energy
Master Energy &
Efficiency Calculator
Hi Accuracy In-Line
Electromagnetic Flowmeter
Hi Accuracy 4-wired
Temperature Sensors
Hi Accuracy Power
Analyzer
Level 1 – Control Room
Building Management
System
Site Implementation
ECM 2 – AHUs (21 nos.)
• Provide Pre-Cooled Coils to treat fresh air
• Fine tune FA damper to comply with SS 553
•
Pre-cooled
coils
Pre-Cooled Coil Installation
ECM 3 – Ventilation System (8 sets)
Site Implementation
Temperature Sensors
VFD
• Install new Variable Frequency
Drives(VFD) and temperature sensor for
Mechanical Ventilation (MV) systems
• Optimise the operation of MV fan by
using VFD with temperature control
Projected Energy Savings
ECM 1 - Chillers Plant
Notes:
DO – During Office Hours AO – After Office Hours
Period Performance
(kW/RT)
Average
Load
(RT)
Operating
hour
(Hours)
Daily Power
Consumption
(kWH/day)
Monthly Power
Consumption
(kWH/ mth)
Pre-Retrofit Consumption
Weekday (DO/AO) 1.01 / 1.91 579 / 66.6 12.5 / 3.5 7,755.1 (Peak)
1,017.6 (Off-Peak)
217,308
Sat 1.91 66.6 16 / 8 2,025.3 (Peak)
1017.6 (Off-peak)
Sun 1.91 66.6 16 / 8 2,025.3 (Peak)
1017.6 (Off-peak)
Post-Retrofit Consumption
Weekday (DO/AO) 0.647/ 0.845 579 / 66.6 12.5 / 3.5 4,698.4 (Peak)
405.6 (Off-Peak)
121,131
Sat 0.845 66.6 16 / 8 811.2 (Peak)
405.6 (Off-peak)
Sun 0.845 66.6 16 / 8 811.2 (Peak)
405.6 (Off-peak)
Monthly kWH Savings 96,177
Projected Energy Savings
Projected Energy Saving
ECM 2 - AHUs
Period Performance
(kW/RT)
Average
Load
(RT)
Operating
hour
(Hours)
Daily Power
Consumption
(kWH/day)
Monthly Power
Consumption
(kWH/ mth)
Pre-Retrofit Consumption
Weekday (DO/AO) 0.27 / 0.59 579 / 66.6 13.3 / 4.0 1,714.8 (Peak)
154.2 (Off-Peak)
43,021
Sat 0.59 66.6 3.5 / 4.0 137.4 (Peak)
154.2 (Off-peak)
Sun 0.59 66.6 3.5 / 4.0 137.4 (Peak)
154.2 (Off-peak)
Post-Retrofit Consumption
Weekday (DO/AO) 0.25 / 0.25 579 / 66.6 13.3 / 4.0 1,572.3 (Peak)
142.7 (Off-Peak)
38,241
Sat 0.25 66.6 3.5 / 4.0 58.3 (Peak)
66.7 (Off-peak)
Sun 0.25 66.6 3.5 / 4.0 58.3 (Peak)
66.7 (Off-peak)
Monthly kWH Savings 4,780Notes:
DO – During Office Hours AO – After Office Hours
ECM 3 - MV Fans
Period Daily Power
Consumption
(kWH/day)
Monthly Power
Consumption
(kWH/ mth)
Pre-Retrofit Consumption
Weekday (DO/AO) 1,504.2 (Peak)
374.15 (Off-Peak)
51,759
Sat 1,254.6 (Peak)
374.15 (Off-peak)
Sun 784.7 (Peak)
139.2 (Off-peak)
Post-Retrofit Consumption
Weekday (DO/AO) 940.3 (Peak)
253.3 (Off-Peak)
33,510
Sat 890.1 (Peak)
253.3 (Off-peak)
Sun 524.0 (Peak)
97.6 (Off-peak)
Monthly kWH Savings 18,250
Projected Energy Saving
Estimated
(Based on Energy Audit
Report)
Projected
(Based on 1 week data after
Implementation)
Description
Proposed
Savings
(kWH/mth)
Proposed
%
Reduction
Projected
Savings
(kWH/mth)
Projected
%
Reduction
EMC 1 (Chiller) 95,044 43.7 96,177 44.3
EMC 2 (AHU) 4,780 11.1 4,780 11.1
EMC 3 (MV) 17,081 33.0 18,250 35.3
116,905 37.5% 119,207 38.2%
Projected Energy Saving
Learning Points
Learning PointsProject Stage
- Pre-survey of site prior to work commencement.
Eg. Removing of access slab for Hoisting of Chiller between
basement 3 plant room and Level 1 hoisting platform.
- Installation of in-line flow meter without disrupting the entire
chilled water system. Eg. Isolation valve faulty during the shutdown.
- Avoid positioning the inlet/discharge PVC chemical dosing pipes
facing the chiller control panel.
- Consider unexpected breakdown during installation stage.
Eg. during the installation of common header for condenser pipe,
consider unexpected breakdown of cooling tower.
Learning Points
GESP Project
• use of high accuracy monitoring devices such as temperature sensors, flow meter, power meter, etc for better monitoring chiller plant system efficiency.
Monitoring Devices
– Hi Accuracy 4-wired Temperature Sensors
– Hi Accuracy In-Line Electromagnetic Flowmeter
– Hi Accuracy Power Analyzer
Hi Accuracy 4-wired
Temperature Sensors
Hi Accuracy In-Line
Electromagnetic Flowmeter
Basement 3 – Energy
Master Energy &
Efficiency Calculator
Hi Accuracy Power
Analyzer
After GESP Measures
• Achieved the COP of 5.48
for Chiller system
• Installed monitoring
instrumentation for cooling
load, electrical power and
chiller efficiency reporting
THANK YOU
