Building Owner World Empire Investment (CI) Limited
Replacement of more efficient chiller
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
Replacement of high efficacy lighting source
Provision of Power and Harmonic Analyser
Building/Project Name Avon Mall
Systems HVAC - Waterside Air Conditioning System
HVAC - Airside Air Conditioning System
Electrical System - Lighting
Electrical System - Electricity Distribution System
Building Automation /Management System
Building Types Commercial - Retail
Description of the building:

  • Shopping Mall with 2 Storeys.
  • Fully air-conditioned with air-cooled central chilled water system, deferential pressure by-pass, constant speed pumps.
  • AHUs / PAUs for shopping mall common area.
  • Low Efficiency LED downlight in Atrium.
       


Retrofitted initiative:
  • HVAC – Chiller System (with BIM)
    • Replace depreciated chillers to higher efficiency chillers and review new chiller combination.
    • Newly install high static condenser fans in new chillers with Variable Speed Drive Control to increase the air circulation rate of condenser in different outdoor temperature conditions.
    • Improve pump efficiency by converting constant speed pumps to variable speed pumps.
    • Replace the zone valves to increase the reliability and accurately control the chilled water supply to designated area.
    • 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. 
       
  • HVAC – Air Side
    • Replace centrifugal fan in AHU by using EC Plug Fan to increase the efficiency.
       
  • Lighting
    • Replace the high efficiency LED downlights in Atrium to improve the lumen but reduce the power density & overall electricity power supply.
       
  • Power Analyser
    • Data collection and monitoring of power consumption of chiller system and tenancy area by installation of power analyser.


Observed benefits other than energy saving:
  • 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.
  • Better human comfort in thermal, lighting and noise.
  • Reduce frequency of working at heights for maintenance of lighting in Atrium. 


General observations of the retrofitting project:
  • HVAC system retrofit have not affected the tenants.
  • Standard retrofitting initiatives with proven technologies and straight forward.
  • Lightings for shopping mall are replaced during overnight with sufficient advanced notice and cordon-off the working area. No complaint from tenant is received.
  • Training to operation staff can strengthen their understanding and familiarising the operation of new Integrated Building Management System (iBMS) and chiller systems.
  • Overall retrofitting of air-conditioning and lighting systems gained the satisfaction from tenants and customers.


Other information:
  • Photos indicating the implementation
    Replace the zone valves for Chilled water control  Use EC Plug Fan for AHU Convert constant speed pumps to variable speed pump
     
    Replace higher efficiency chiller plant Replace higher efficiency LED downlight Install central control and monitor system
    Replace high static condenser fans Chiller plant BIM model rendering  
      
 
Cost Saving
Total cost: HKD 5.6 million Total savings/year: HKD 637,000
Cost breakdown: 1. Chilled Water System with CCMS: HKD 5 million
2. AHU with EC Plug Fan: HKD 0.37 million
3. High Efficiency LED Downlights: HKD 0.25 million		 Savings/year breakdown: • Chilled Water System with iBMS: HKD 575,000 / 8.7 years
• AHU with EC Plug Fan: HKD 42,000 / 8.8 years
• High Efficiency LED Downlight: HKD 20,000 / 12.5 years
Payback: ~ 8.82 years
Award
Award received by the project: CLP Smart Energy Award 2021 - Merit Certificate
Subsidy/ Funding
The project is supported by: CLP Eco Building Fund


Replacement of more efficient chiller
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
Replacement of high efficacy lighting source
Provision of Power and Harmonic Analyser
Building Owner World Empire Investment (CI) Limited
Building/Project Name Avon Mall
Systems HVAC - Waterside Air Conditioning System
HVAC - Airside Air Conditioning System
Electrical System - Lighting
Electrical System - Electricity Distribution System
Building Automation /Management System
Building Types Commercial - Retail
Description of the building:


  • Shopping Mall with 2 Storeys.
  • Fully air-conditioned with air-cooled central chilled water system, deferential pressure by-pass, constant speed pumps.
  • AHUs / PAUs for shopping mall common area.
  • Low Efficiency LED downlight in Atrium.
       
Retrofitted initiative:

  • HVAC – Chiller System (with BIM)
    • Replace depreciated chillers to higher efficiency chillers and review new chiller combination.
    • Newly install high static condenser fans in new chillers with Variable Speed Drive Control to increase the air circulation rate of condenser in different outdoor temperature conditions.
    • Improve pump efficiency by converting constant speed pumps to variable speed pumps.
    • Replace the zone valves to increase the reliability and accurately control the chilled water supply to designated area.
    • 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. 
       
  • HVAC – Air Side
    • Replace centrifugal fan in AHU by using EC Plug Fan to increase the efficiency.
       
  • Lighting
    • Replace the high efficiency LED downlights in Atrium to improve the lumen but reduce the power density & overall electricity power supply.
       
  • Power Analyser
    • Data collection and monitoring of power consumption of chiller system and tenancy area by installation of power analyser.

Observed benefits other than energy saving:

  • 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.
  • Better human comfort in thermal, lighting and noise.
  • Reduce frequency of working at heights for maintenance of lighting in Atrium. 

General observations of the retrofitting project:

  • HVAC system retrofit have not affected the tenants.
  • Standard retrofitting initiatives with proven technologies and straight forward.
  • Lightings for shopping mall are replaced during overnight with sufficient advanced notice and cordon-off the working area. No complaint from tenant is received.
  • Training to operation staff can strengthen their understanding and familiarising the operation of new Integrated Building Management System (iBMS) and chiller systems.
  • Overall retrofitting of air-conditioning and lighting systems gained the satisfaction from tenants and customers.

Other information:

  • Photos indicating the implementation
    Replace the zone valves for Chilled water control  Use EC Plug Fan for AHU Convert constant speed pumps to variable speed pump
     
    Replace higher efficiency chiller plant Replace higher efficiency LED downlight Install central control and monitor system
    Replace high static condenser fans Chiller plant BIM model rendering  
      
 
Cost Saving
Total cost: HKD 5.6 million Total savings/year: HKD 637,000
Cost breakdown: 1. Chilled Water System with CCMS: HKD 5 million
2. AHU with EC Plug Fan: HKD 0.37 million
3. High Efficiency LED Downlights: HKD 0.25 million		 Savings/year breakdown: • Chilled Water System with iBMS: HKD 575,000 / 8.7 years
• AHU with EC Plug Fan: HKD 42,000 / 8.8 years
• High Efficiency LED Downlight: HKD 20,000 / 12.5 years
Payback: ~ 8.82 years
Award
Award received by the project: CLP Smart Energy Award 2021 - Merit Certificate
Subsidy/ Funding
The project is supported by: CLP Eco Building Fund


Replacement of more efficient chiller
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
Replacement of high efficacy lighting source
Provision of Power and Harmonic Analyser

   


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