|
Building Owner
|
Harvest Sun Limited
|
Conversion of air-cooled to water-cooled chiller plant
Conversion to variable speed cooling tower fan
Conversion to variable speed chilled water pump
Supply and return chilled water temperature differential control with zone control valve
Using electronically commutated (EC) plug fan in AHU / PAU / CRAC
Provision of Smart Metering
Renewable energy integrated with roof / green roof
| | Building/Project Name |
Olympian City 1
| | Systems |
HVAC - Waterside Air Conditioning System
HVAC - Airside Air Conditioning System
Electrical System - Electricity Distribution System
Opaque Wall and Roof System
Building Automation /Management System
| | Building Types |
Commercial - Retail
|
Description of the building:
- Wholly Owned Shopping Arcade with parking space from G/F to 1/F.
- Three floors shopping centre.
- Fully water-cooled air-conditioned system.
- BMS monitored A/C, Plumbing and Electrical System.
- Grid-connected Photovoltaic System.
|
|
 |
Retrofitted initiative:
Chiller plant
- Replace depreciated air-cooled chillers to water-cooled and review new chiller combination.
- Newly install cooling tower fans with Variable Speed Drive Control to control the air flow rate to suit the operation condition.
- Improve chilled / condenser water pumps efficiency by converting constant speed pumps to variable speed pumps.
- Newly install Integrated Building Management System(iBMS) to enhance the system monitoring and optimise the chiller operation so as to maximise the overall system efficiency.
- Data collection and monitoring of power consumption of chiller system by installation of power analyser.
Electrically Commutated (EC) plug fans for AHU
- To provide the higher efficiency of motor as well as the cost and energy efficient.
Energy Valve
- Better control of water flow rate which matches the cooling load.
- More precise control with better control logic by controlling the flow rate instead of valve position only.
Photovoltaic system
- Total 178 pcs. of PV panels with 89 kWp.
Observed benefits other than energy saving:
Replacement of air-cooled chiller plant to fresh water-cooled chiller plant
- Increase reliability and life span of system and equipment.
- Enhance hardware to for future retro-commissioning and operation review.
- More information for data analysis to implement plant monitoring and reporting.
Electrically Commutated (EC) plug fans for AHU
- Fan speed reduced and less noise created.
Energy Valve
- Better balancing of chilled water flow. Can reduce excessive demand of chilled water and circulate surplus water to other moredemanding AHUs/FCUs.
- Can check the actual flow rate of the AHU and whether or not the system chilled water flow is well balanced or not.
General observations of the retrofitting project:
- HVAC system retrofit have not affected the tenants.
- Standard retrofitting initiatives with proven technologies and straight forward.
- Training to operation staff can strengthen their understanding and familiarising the operation of new Integrated Building Management System (iBMS) and chiller systems.
- The flow & delta temperature control mode of the Energy Valve help in saving chilled water flow in individual AHU. By adopting the VSD feature of chilled water pump,more energy can be saved.
- Permanently measures and logs the energy usage of the application, the flow and the differential temperature across the coil. This creates full load transparency in the system.
- Electronic PI valves have a much lower pressure drop that mechanical PI valves and therefore require significantly lower differential pressures to achieve designed flow.
Other information:
- Water-cooled Chiller Plant
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|
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|
|
|
|
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|
|
|
|
|
|
| Cost |
Saving |
| Total cost: |
HKD 17,495,000 + HKD 1.89 million |
Total savings/year: |
HKD 2.17 million & PV: HKD 0.21 million |
| Savings/year breakdown: |
• Chiller Plant: HKD 2.1million
• EC fan: HKD 62,000
• Energy Valve: HKD 9,000
• PV system generated power: HKD 214,000 |
| Cost breakdown: |
• Chiller Plant : HKD 17.4 million
• EC Fans (4 nos.) HKD 74,000
• Energy valve (1 no.) HKD 21,000
• PV system : HKD 1.89 million |
Payback: |
• Chiller Plant: 8.3 years
• EC fans: 1.2 years
• Energy Valve: 2.3 years
• PV system :9 years |
| Subsidy/ Funding |
| The project is supported by: |
CLP Eco Building Fund
CLP Renewable Energy Feed-in Tariff |
| |
|
Conversion of air-cooled to water-cooled chiller plant
Conversion to variable speed cooling tower fan
Conversion to variable speed chilled water pump
Supply and return chilled water temperature differential control with zone control valve
Using electronically commutated (EC) plug fan in AHU / PAU / CRAC
Provision of Smart Metering
Renewable energy integrated with roof / green roof
|
|
|
Building Owner
|
Harvest Sun Limited
| | Building/Project Name |
Olympian City 1
| |
Systems |
HVAC - Waterside Air Conditioning System
HVAC - Airside Air Conditioning System
Electrical System - Electricity Distribution System
Opaque Wall and Roof System
Building Automation /Management System
| |
Building Types |
Commercial - Retail
|
Description of the building:
|
|
- Wholly Owned Shopping Arcade with parking space from G/F to 1/F.
- Three floors shopping centre.
- Fully water-cooled air-conditioned system.
- BMS monitored A/C, Plumbing and Electrical System.
- Grid-connected Photovoltaic System.
|
|
|
Retrofitted initiative:
Chiller plant
- Replace depreciated air-cooled chillers to water-cooled and review new chiller combination.
- Newly install cooling tower fans with Variable Speed Drive Control to control the air flow rate to suit the operation condition.
- Improve chilled / condenser water pumps efficiency by converting constant speed pumps to variable speed pumps.
- Newly install Integrated Building Management System(iBMS) to enhance the system monitoring and optimise the chiller operation so as to maximise the overall system efficiency.
- Data collection and monitoring of power consumption of chiller system by installation of power analyser.
Electrically Commutated (EC) plug fans for AHU
- To provide the higher efficiency of motor as well as the cost and energy efficient.
Energy Valve
- Better control of water flow rate which matches the cooling load.
- More precise control with better control logic by controlling the flow rate instead of valve position only.
Photovoltaic system
- Total 178 pcs. of PV panels with 89 kWp.
Observed benefits other than energy saving:
Replacement of air-cooled chiller plant to fresh water-cooled chiller plant
- Increase reliability and life span of system and equipment.
- Enhance hardware to for future retro-commissioning and operation review.
- More information for data analysis to implement plant monitoring and reporting.
Electrically Commutated (EC) plug fans for AHU
- Fan speed reduced and less noise created.
Energy Valve
- Better balancing of chilled water flow. Can reduce excessive demand of chilled water and circulate surplus water to other moredemanding AHUs/FCUs.
- Can check the actual flow rate of the AHU and whether or not the system chilled water flow is well balanced or not.
General observations of the retrofitting project:
- HVAC system retrofit have not affected the tenants.
- Standard retrofitting initiatives with proven technologies and straight forward.
- Training to operation staff can strengthen their understanding and familiarising the operation of new Integrated Building Management System (iBMS) and chiller systems.
- The flow & delta temperature control mode of the Energy Valve help in saving chilled water flow in individual AHU. By adopting the VSD feature of chilled water pump,more energy can be saved.
- Permanently measures and logs the energy usage of the application, the flow and the differential temperature across the coil. This creates full load transparency in the system.
- Electronic PI valves have a much lower pressure drop that mechanical PI valves and therefore require significantly lower differential pressures to achieve designed flow.
Other information:
- Water-cooled Chiller Plant
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Cost |
Saving |
| Total cost: |
HKD 17,495,000 + HKD 1.89 million |
Total savings/year: |
HKD 2.17 million & PV: HKD 0.21 million |
| Savings/year breakdown: |
• Chiller Plant: HKD 2.1million
• EC fan: HKD 62,000
• Energy Valve: HKD 9,000
• PV system generated power: HKD 214,000 |
| Cost breakdown: |
• Chiller Plant : HKD 17.4 million
• EC Fans (4 nos.) HKD 74,000
• Energy valve (1 no.) HKD 21,000
• PV system : HKD 1.89 million |
Payback: |
• Chiller Plant: 8.3 years
• EC fans: 1.2 years
• Energy Valve: 2.3 years
• PV system :9 years |
| Subsidy/ Funding |
| The project is supported by: |
CLP Eco Building Fund
CLP Renewable Energy Feed-in Tariff |
| |
|
Conversion of air-cooled to water-cooled chiller plant
Conversion to variable speed cooling tower fan
Conversion to variable speed chilled water pump
Supply and return chilled water temperature differential control with zone control valve
Using electronically commutated (EC) plug fan in AHU / PAU / CRAC
Provision of Smart Metering
Renewable energy integrated with roof / green roof
|
|
|
