Building Owner The Hong Kong & China Gas Company Limited
Using high volume low pressure (HVLP) ceiling fan for ventilated cooling
Using electronically commutated (EC) plug fan in AHU / PAU / CRAC
Replacement of high efficacy lighting source
Modernisation of lifts and escalators
Building/Project Name Towngas Headquarters Building
Systems HVAC - Airside Air Conditioning System
HVAC - Carpark Mechanical Ventilation System
Electrical System - Lighting
Electrical System - Lift and Escalator
Building Types Commercial - Office
Description of the building:
  • Office in Industrial-Office Building with 28 floors (13 floors of offices, 5 floors of warehouse, 5 floors of carpark, 2 floors of multifunctional areas (11/F &12/F), B/F, G/F Entrance and R/F Plant Rooms).
  • Fully air-conditioned with water cooled centrifugal oil free type VSD chillers, VSD Chilled Water Pumps and Cooling Towers.
  • Air Handling Units and Fan Coil Units with pre-treated fresh air.
  • ACVVVF Lift Control for Cargo Lifts.
  • T5 LED Light Tubes.
  


Retrofitted initiative:
HVAC-Air-side:
HVAC Primary Fresh Air System:
  • Replacement of belt-driven centrifugal VSD fan in AHU/PAU by electronically commutated (EC) plug fan.
  • Installation of High Volume Low Speed Ceiling Fans for 1/F Carpark.

Electrical Systems:
Lighting
  • Replacement of all 13/F-25/F office lightings into T5 LED tubes.
Lift
  • Cargo Lift Modernization of the existing DC Lift Control to ACVVVF Lift Control.


Observed benefits other than energy saving:
  • Fan speed reduced and less noise created. Improved indoor air quality and nil complaint for insufficient fresh air.
  • Produced a large scale of natural wind, ventilate and cool the air in large space.
  • Reduced the maintenance cost and manpower cost by prolonged lifetime of the LED tube up to average 30,000 hours.
  • Improved the operation stability and reliability, and reduced breakdown rate.


General observations of the retrofitting project:
  • Fresh air supply system retrofit did not affect the users in general.
  • The installation of 2 nos. HVLS fans in 1/F Carpark required extra personnel to conduct traffic control, in order to enhance site safety.
  • Lightings were replaced in non-office working hours with sufficient advance coordination with users and cordoned-off the working area.
  • Lift modernization required advance planning of lift arrangement, in order to minimizie the lift waiting time and the disturbance to the passengers.


Other information:
EC Fan   Lift Modenisation
   
     
 LED Lighting    HVLS Fan in Carpark
     

Cost Saving
Total cost: HKD 9,224,000 Total savings/year: HKD 594,000
Cost breakdown: EC plug fan replacement for B/F AHU: HKD 30,000
EC plug fan replacement for G/F AHU: HKD 50,000
EC plug fan replacement for 21/F PAU: HKD 58,000
HVLS fans for 1/F Carpark: HKD 277,000
Replacement of LED tubes at 13/F-25/F: HKD 1,946,000
Cargo lift modernization: HKD 6,710,000
CRAC units with EC fans: HKD 153,000		 Saving/year breakdown:
EC plug fan replacement for B/F AHU: HKD 29,500 Payback: 1 year
EC plug fan replacement for G/F AHU: HKD 8,200 Payback: 6.1 years
EC plug fan replacement for 21/F PAU: HKD 6,000 Payback: 9.5 years
HVLS fans for 1/F Carpark: 7.4 years
LED tubes replacement: HKD 225,200 Payback: 8.6 years
Cargo lift modernization: HKD 261,100 Payback: 25.7 years
CRAC units with EC fans: HKD 26,900 Payback: 5.7 years
Payback: 15.5 years


Using high volume low pressure (HVLP) ceiling fan for ventilated cooling
Using electronically commutated (EC) plug fan in AHU / PAU / CRAC
Replacement of high efficacy lighting source
Modernisation of lifts and escalators
Building Owner The Hong Kong & China Gas Company Limited
Building/Project Name Towngas Headquarters Building
Systems HVAC - Airside Air Conditioning System
HVAC - Carpark Mechanical Ventilation System
Electrical System - Lighting
Electrical System - Lift and Escalator
Building Types Commercial - Office
Description of the building:

  • Office in Industrial-Office Building with 28 floors (13 floors of offices, 5 floors of warehouse, 5 floors of carpark, 2 floors of multifunctional areas (11/F &12/F), B/F, G/F Entrance and R/F Plant Rooms).
  • Fully air-conditioned with water cooled centrifugal oil free type VSD chillers, VSD Chilled Water Pumps and Cooling Towers.
  • Air Handling Units and Fan Coil Units with pre-treated fresh air.
  • ACVVVF Lift Control for Cargo Lifts.
  • T5 LED Light Tubes.
  
Retrofitted initiative:

HVAC-Air-side:
HVAC Primary Fresh Air System:
  • Replacement of belt-driven centrifugal VSD fan in AHU/PAU by electronically commutated (EC) plug fan.
  • Installation of High Volume Low Speed Ceiling Fans for 1/F Carpark.

Electrical Systems:
Lighting
  • Replacement of all 13/F-25/F office lightings into T5 LED tubes.
Lift
  • Cargo Lift Modernization of the existing DC Lift Control to ACVVVF Lift Control.

Observed benefits other than energy saving:

  • Fan speed reduced and less noise created. Improved indoor air quality and nil complaint for insufficient fresh air.
  • Produced a large scale of natural wind, ventilate and cool the air in large space.
  • Reduced the maintenance cost and manpower cost by prolonged lifetime of the LED tube up to average 30,000 hours.
  • Improved the operation stability and reliability, and reduced breakdown rate.

General observations of the retrofitting project:

  • Fresh air supply system retrofit did not affect the users in general.
  • The installation of 2 nos. HVLS fans in 1/F Carpark required extra personnel to conduct traffic control, in order to enhance site safety.
  • Lightings were replaced in non-office working hours with sufficient advance coordination with users and cordoned-off the working area.
  • Lift modernization required advance planning of lift arrangement, in order to minimizie the lift waiting time and the disturbance to the passengers.

Other information:

EC Fan   Lift Modenisation
   
     
 LED Lighting    HVLS Fan in Carpark
     

Cost Saving
Total cost: HKD 9,224,000 Total savings/year: HKD 594,000
Cost breakdown: EC plug fan replacement for B/F AHU: HKD 30,000
EC plug fan replacement for G/F AHU: HKD 50,000
EC plug fan replacement for 21/F PAU: HKD 58,000
HVLS fans for 1/F Carpark: HKD 277,000
Replacement of LED tubes at 13/F-25/F: HKD 1,946,000
Cargo lift modernization: HKD 6,710,000
CRAC units with EC fans: HKD 153,000		 Saving/year breakdown:
EC plug fan replacement for B/F AHU: HKD 29,500 Payback: 1 year
EC plug fan replacement for G/F AHU: HKD 8,200 Payback: 6.1 years
EC plug fan replacement for 21/F PAU: HKD 6,000 Payback: 9.5 years
HVLS fans for 1/F Carpark: 7.4 years
LED tubes replacement: HKD 225,200 Payback: 8.6 years
Cargo lift modernization: HKD 261,100 Payback: 25.7 years
CRAC units with EC fans: HKD 26,900 Payback: 5.7 years
Payback: 15.5 years


Using high volume low pressure (HVLP) ceiling fan for ventilated cooling
Using electronically commutated (EC) plug fan in AHU / PAU / CRAC
Replacement of high efficacy lighting source
Modernisation of lifts and escalators

   


Privacy Policy | Disclaimer
  
© 2025 Hong Kong Green Building Council Limited. All Rights Reserved.


  
 
Eng | 繁體 | 简体