Appendix A - Project Information and Current Building Performance Chiller No 1 Project information Building name: Year Built: Site Area: Skunk Works Tower 2017 7,132 m² Gross Floor Area: Plot Ratio: Block: Storey: Average cooling load (weekdays): Average Air-con system efficiency: 32,000m² 4.5 Single block 12-storey, with open car park 560 RT 0.95 kW/RT Information on current energy efficiency No permanent measuring instrumentation to monitor the chilled-water system 8 nos. lifts (which includes 2 nos. of fire/service lifts) with destination control system, sleep mode and variable frequency motor drive No escalator in the building 90% of the office areas are air-conditioned Air-conditioning equipment list Equipment Description Quantity Refrigerant Capacity Remarks 1 R123 650RT VSD, certified by SGBC Chiller No 2 1 R134a 500RT VSD, certified by SGBC Chiller No 3 1 R134a 250RT VSD, certified by SGBC Chiller No 4 1 R134a 150RT VSD, certified by SGBC Chilled Water Pump 1 & 2 2 15kW (each) VSD Chilled Water Pump 3 1 5.5kW VSD Chilled Water Pump 4 1 3.5kW VSD Condenser Water Pump 1 1 55kW VSD Condenser Water Pump 2 1 37kW VSD Condenser Water Pump 3 & 4 Cooling Towers 2 19kW(each) VSD 4 7.5kW x 2 (each) VSD Air-distribution system Total Existing Total Air Flow Existing Motor Power Allowable nameplate motor Total Allowable Motor Power Equipment Rating Variable volume Constant volume Total (CMH) 11,000 9,000 20,000 (W/CMH) 0.74 (W) power (W/CMH) Rating (W) 8,140 0.74 8,140 0.47 4,230 0.47 4,230 12,370 12,370 Others Toilets and staircases: Pantries and lift lobbies: Carpark: Natural Ventilation Existing lighting schedule Mechanical Ventilation Mechanical ventilation with CO sensors Total Reference Total Existing Power Monthly Electricity Consumption (kWh) Spaces Estimated Area (m²) (SS530) Power Consumption (W) Consumption (W/m²) Months kWh Jan 616,000 Feb 642,000 Mar 670,000 Apr 536,000 May 556.000 Jun 638,000 Jul 512,000 Aug 559,000 Sep 513,000 Oct 432,000 Offices 24,000.00 475,000.00 15 Lobbies 2,600.00 20,000.00 10 Stairs 800.00 4,800.00 6 Corridors 1,200.00 18,000.00 10 Stores 650.00 4,500.00 10 Café 450.00 6,500.00 15 Toilet 500.00 7,500.00 14.8 Nov 551,000 Dec 467,000 Total 6,692,000

Appendix A - Project Information and Current Building Performance Chiller No 1 Project information Building name: Year Built: Site Area: Skunk Works Tower 2017 7,132 m² Gross Floor Area: Plot Ratio: Block: Storey: Average cooling load (weekdays): Average Air-con system efficiency: 32,000m² 4.5 Single block 12-storey, with open car park 560 RT 0.95 kW/RT Information on current energy efficiency No permanent measuring instrumentation to monitor the chilled-water system 8 nos. lifts (which includes 2 nos. of fire/service lifts) with destination control system, sleep mode and variable frequency motor drive No escalator in the building 90% of the office areas are air-conditioned Air-conditioning equipment list Equipment Description Quantity Refrigerant Capacity Remarks 1 R123 650RT VSD, certified by SGBC Chiller No 2 1 R134a 500RT VSD, certified by SGBC Chiller No 3 1 R134a 250RT VSD, certified by SGBC Chiller No 4 1 R134a 150RT VSD, certified by SGBC Chilled Water Pump 1 & 2 2 15kW (each) VSD Chilled Water Pump 3 1 5.5kW VSD Chilled Water Pump 4 1 3.5kW VSD Condenser Water Pump 1 1 55kW VSD Condenser Water Pump 2 1 37kW VSD Condenser Water Pump 3 & 4 Cooling Towers 2 19kW(each) VSD 4 7.5kW x 2 (each) VSD Air-distribution system Total Existing Total Air Flow Existing Motor Power Allowable nameplate motor Total Allowable Motor Power Equipment Rating Variable volume Constant volume Total (CMH) 11,000 9,000 20,000 (W/CMH) 0.74 (W) power (W/CMH) Rating (W) 8,140 0.74 8,140 0.47 4,230 0.47 4,230 12,370 12,370 Others Toilets and staircases: Pantries and lift lobbies: Carpark: Natural Ventilation Existing lighting schedule Mechanical Ventilation Mechanical ventilation with CO sensors Total Reference Total Existing Power Monthly Electricity Consumption (kWh) Spaces Estimated Area (m²) (SS530) Power Consumption (W) Consumption (W/m²) Months kWh Jan 616,000 Feb 642,000 Mar 670,000 Apr 536,000 May 556.000 Jun 638,000 Jul 512,000 Aug 559,000 Sep 513,000 Oct 432,000 Offices 24,000.00 475,000.00 15 Lobbies 2,600.00 20,000.00 10 Stairs 800.00 4,800.00 6 Corridors 1,200.00 18,000.00 10 Stores 650.00 4,500.00 10 Café 450.00 6,500.00 15 Toilet 500.00 7,500.00 14.8 Nov 551,000 Dec 467,000 Total 6,692,000

Residential Construction Academy: House Wiring (MindTap Course List)

4th Edition

ISBN:9781285852225

Author:Gregory W Fletcher

Publisher:Gregory W Fletcher

Chapter14: Branch-circuit Installation

Section: Chapter Questions

Problem 11RQ

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The office building was built in year 2017 and has not obtained any Green Mark certification

before. The office building is occupied by a single tenant/entity. The building management team had

done an analysis of the building’s energy performance by extracting the data from the various

systems. The current performance and findings of the systems are listed in Appendix A.

The client is considering to have the building undergo retrofitting to improve the building’s energy performance.

The objective is to achieve Green Mark Gold Plus under the new Green Mark 2021 framework.

For part (a) below, you are to use Pathway 1: EUI for this.

(a) As part of the feasibility exercise, you are to interpret the current performance of the existing building based on the data available (Refer to Appendix A). You should then organise and present to the client how does the current building relate to the Energy Efficiency Section of GM: 2021. With the information above, demonstrate your ability to identify and recommend areas for improvement to comply to the pre-requisites for the Energy Efficiency Section of GM: 2021 for the building.

For part (b) below, you are to use Pathway 2: Fixed Metrics for this.

(b) Similar to the feasibility exercise above, you are to evaluate the current performance and findings of the existing building based on the data available (Refer to Appendix A), You should then organise and present to the client how does the current building relate to the Energy Efficiency Section of GM: 2021. Finally, demonstrate your ability to identify and recommend areas for improvement to comply to the pre-requisites for the Energy Efficiency Section of GM: 2021 for the building

Appendix A - Project Information and Current Building Performance
Chiller No 1
Project information
Building name:
Year Built:
Site Area:
Skunk Works Tower
2017
7,132 m²
Gross Floor Area:
Plot Ratio:
Block:
Storey:
Average cooling load (weekdays):
Average Air-con system efficiency:
32,000m²
4.5
Single block
12-storey, with open car park
560 RT
0.95 kW/RT
Information on current energy efficiency
No permanent measuring instrumentation to monitor the chilled-water system
8 nos. lifts (which includes 2 nos. of fire/service lifts) with destination control system,
sleep mode and variable frequency motor drive
No escalator in the building
90% of the office areas are air-conditioned
Air-conditioning equipment list
Equipment Description
Quantity Refrigerant
Capacity
Remarks
1
R123
650RT
VSD, certified by SGBC
Chiller No 2
1
R134a
500RT
VSD, certified by SGBC
Chiller No 3
1
R134a
250RT
VSD, certified by SGBC
Chiller No 4
1
R134a
150RT
VSD, certified by SGBC
Chilled Water Pump 1 & 2
2
15kW (each)
VSD
Chilled Water Pump 3
1
5.5kW
VSD
Chilled Water Pump 4
1
3.5kW
VSD
Condenser Water Pump 1
1
55kW
VSD
Condenser Water Pump 2
1
37kW
VSD
Condenser Water Pump 3 & 4
Cooling Towers
2
19kW(each)
VSD
4
7.5kW x 2 (each)
VSD
Air-distribution system
Total Existing
Total Air Flow
Existing
Motor Power
Allowable
nameplate motor
Total Allowable
Motor Power
Equipment
Rating
Variable volume
Constant volume
Total
(CMH)
11,000
9,000
20,000
(W/CMH)
0.74
(W)
power
(W/CMH)
Rating
(W)
8,140
0.74
8,140
0.47
4,230
0.47
4,230
12,370
12,370
Others
Toilets and staircases:
Pantries and lift lobbies:
Carpark:
Natural Ventilation
Existing lighting schedule
Mechanical Ventilation
Mechanical ventilation with CO sensors
Total Reference
Total Existing Power
Monthly Electricity Consumption (kWh)
Spaces
Estimated Area (m²)
(SS530) Power
Consumption (W)
Consumption (W/m²)
Months kWh
Jan
616,000
Feb
642,000
Mar
670,000
Apr
536,000
May
556.000
Jun
638,000
Jul
512,000
Aug
559,000
Sep
513,000
Oct
432,000
Offices
24,000.00
475,000.00
15
Lobbies
2,600.00
20,000.00
10
Stairs
800.00
4,800.00
6
Corridors
1,200.00
18,000.00
10
Stores
650.00
4,500.00
10
Café
450.00
6,500.00
15
Toilet
500.00
7,500.00
14.8
Nov 551,000
Dec
467,000
Total
6,692,000

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