Building Owner Hornbrook Investment Limited
Replacement of more efficient chiller
Installation of electromagnetic clamp-on / ultrasonic devices for condensing water system
Conversion to variable speed chilled water pump
Replacement of high efficacy lighting source
Provision of Smart Metering
Renewable energy integrated with roof / green roof
Building/Project Name Empire Centre
Systems HVAC - Waterside Air Conditioning System
Electrical System - Lighting
Electrical System - Electricity Distribution System
Opaque Wall and Roof System
Building Automation /Management System
Building Types Commercial - Retail
Others - Carpark    
Description of the building:
  • Grade A commercial complex with 11 floors of offices, 4 floors of shopping arcade and 1 floor of basement carpark
  • Fully air-conditioned with seawater-cooled central chilled water system with differential pressure by-pass
  • Fan coil units for offices and shopping arcade
  • LED, T8 & T5 light tube





Retrofitted initiative:
HVAC- Water-side :
  • Replacement of 2 sets seawater-cooled centrifugal chillers to variable speed drive (VSD) screw chillers. (one completed and one in progress);
  • Replacement of 2 sets of chilled water pump with IE3 motor and installation of variable speed drive to 2 sets of new secondary chilled water pumps;
  • Installed electromagnetic water conditioner for condensing water;
  • Installed a Central Control & Monitoring System (CCMS) for system monitoring and data logging;

Electrical Systems & Smart Control Systems :
  • Replacement of LED tubes for carpark area;
  • Installed smart metering in HV and LV power supply system with energy management system for whole buildings (tenants & common area) ; 
Others :
  • Installation of 126.9 kW Photovoltaic System on R/F;
  • Conducted retro-commissioning (RCx)


Observed benefits other than energy saving:
  • Increase reliability and life span of system and equipment;
  • Reduced maintenance resources in chiller plant operations and future continuous RCx and balancing;
  • Better efficiency operation under light load condition;
  • More information for chiller plant monitoring and reporting; and
  • Enables real-time monitoring of power quality of all building services in our buildings, hence aiding the planning and implementation of energy saving initiatives through turning raw measurement data into insightful power quality performance information. 


General observations of the retrofitting project:
  • HVAC system retrofit & PV system with waterproofing work at R/F has not affected the tenants; and
  • Some advanced technologies, such as CCMS and remote condensing water monitoring system, can be led in a chiller plant retrofit project. This is value-added. 


Other information:
 Central Control & Monitoring System (CCMS)


Smart Meter for HV System

Power Management



Chiller Plant and Electromagnetic Water Conditioner


PV Panels


Cost Saving
Total cost: HKD 9.8 million Total savings/year: HKD 1.4 million
Savings/year breakdown: Chiller Plant : HKD 0.8 million (10.1 years)
PV System : HKD 0.57 million (3.0 years)
Carpark Lighting : HKD 3,700 (1.1 years)
Cost breakdown: Chiller Plant : HKD 8.1 million
PV system : HKD 1.7 million
Carpark lighting : HKD 4,000		 Payback: 7.0 years
Award
Award received by the project: BEAM Plus EB V2.0, Platinum
Subsidy/ Funding
The project is supported by: CLP Eco Building Fund
CLP Renewable Energy Feed-in Tarif


Replacement of more efficient chiller
Installation of electromagnetic clamp-on / ultrasonic devices for condensing water system
Conversion to variable speed chilled water pump
Replacement of high efficacy lighting source
Provision of Smart Metering
Renewable energy integrated with roof / green roof
Building Owner Hornbrook Investment Limited
Building/Project Name Empire Centre
Systems HVAC - Waterside Air Conditioning System
Electrical System - Lighting
Electrical System - Electricity Distribution System
Opaque Wall and Roof System
Building Automation /Management System
Building Types Commercial - Retail
Others - Carpark    
Description of the building:

  • Grade A commercial complex with 11 floors of offices, 4 floors of shopping arcade and 1 floor of basement carpark
  • Fully air-conditioned with seawater-cooled central chilled water system with differential pressure by-pass
  • Fan coil units for offices and shopping arcade
  • LED, T8 & T5 light tube



Retrofitted initiative:

HVAC- Water-side :
  • Replacement of 2 sets seawater-cooled centrifugal chillers to variable speed drive (VSD) screw chillers. (one completed and one in progress);
  • Replacement of 2 sets of chilled water pump with IE3 motor and installation of variable speed drive to 2 sets of new secondary chilled water pumps;
  • Installed electromagnetic water conditioner for condensing water;
  • Installed a Central Control & Monitoring System (CCMS) for system monitoring and data logging;

Electrical Systems & Smart Control Systems :
  • Replacement of LED tubes for carpark area;
  • Installed smart metering in HV and LV power supply system with energy management system for whole buildings (tenants & common area) ; 
Others :
  • Installation of 126.9 kW Photovoltaic System on R/F;
  • Conducted retro-commissioning (RCx)

Observed benefits other than energy saving:

  • Increase reliability and life span of system and equipment;
  • Reduced maintenance resources in chiller plant operations and future continuous RCx and balancing;
  • Better efficiency operation under light load condition;
  • More information for chiller plant monitoring and reporting; and
  • Enables real-time monitoring of power quality of all building services in our buildings, hence aiding the planning and implementation of energy saving initiatives through turning raw measurement data into insightful power quality performance information. 

General observations of the retrofitting project:

  • HVAC system retrofit & PV system with waterproofing work at R/F has not affected the tenants; and
  • Some advanced technologies, such as CCMS and remote condensing water monitoring system, can be led in a chiller plant retrofit project. This is value-added. 

Other information:

 Central Control & Monitoring System (CCMS)


Smart Meter for HV System

Power Management



Chiller Plant and Electromagnetic Water Conditioner


PV Panels


Cost Saving
Total cost: HKD 9.8 million Total savings/year: HKD 1.4 million
Savings/year breakdown: Chiller Plant : HKD 0.8 million (10.1 years)
PV System : HKD 0.57 million (3.0 years)
Carpark Lighting : HKD 3,700 (1.1 years)
Cost breakdown: Chiller Plant : HKD 8.1 million
PV system : HKD 1.7 million
Carpark lighting : HKD 4,000		 Payback: 7.0 years
Award
Award received by the project: BEAM Plus EB V2.0, Platinum
Subsidy/ Funding
The project is supported by: CLP Eco Building Fund
CLP Renewable Energy Feed-in Tarif


Replacement of more efficient chiller
Installation of electromagnetic clamp-on / ultrasonic devices for condensing water system
Conversion to variable speed chilled water pump
Replacement of high efficacy lighting source
Provision of Smart Metering
Renewable energy integrated with roof / green roof

   


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