|
Building Owner
|
Champion REIT
|
| | Building/Project Name |
Champion Tower
| | Systems |
| | Building Types |
Commercial - Office
|
Description of the building:
South-west facing office unit at 25/F of Grade A office building in Central
Retrofitted initiative:
- To improve solar shading performance of current curtainwall glass and hence cooling energy saving for the office unit.
- To improve thermal comfort of office unit occupants.
- To stabilise indoor air temperature in sunny and cloudy days.
- To validate solar shading and energy saving improvement for consideration of full scale retrofit for the whole building. Validation was done by HK Polytechnic University
Typical Details for BVG
Observed benefits other than energy saving:
- Improved thermal comfort.
- Improved sound reduction from 35 to 40dB (Rw).
- Reduced UV light transmittance to indoor to 5%.
- Reduced glass indoor reflectance from 47% to 35%.
- Eliminated condensation on glass at cold morning time.
- Stabilised solar heat flow to indoor.
General observations of the retrofitting project:
- The measured data indicates that, for both sunny day and cloudy day, the VIG retrofit can effectively stabilise the inside surface temperature of the window glass and significantly reduce the heat gain through windows.
- The risk of condensation on the insider surface of windows can be eliminated because of the VIG retrofit as the inside glass surface temperature is higher in winter.
- For VIG retrofit on this glass in the building, the energy-saving potential is 8.4% - 32.1% for different orientation.
- A higher cooling setpoint temperature for the indoor space is possible for additional energy saving without compromising the indoor thermal comfort. The potential saving is 25.2 kWh/m2 (floor area) when cooling set point is increased by 1ºC.
- The OTTV is reduced by around 70% to 11 W/m2 level.
- Annual energy saving per window area HK$150.82/year.
- Reduce the carbon emission of 63.8 kg CO2-e/ m2 (window area).
Other information:
Installation
| Cost |
Saving |
| Total cost: |
HKD 26,730 |
Total savings/year: |
HKD 2,443 (first year) |
| Payback: |
8.25 years for case office unit
4.58 years for west facing office units |
| Award |
| Award received by the project: |
CIC Green Product Certificate (Platinum) for vacuum glass |
| Subsidy/ Funding |
| The project is supported by: |
Building owner |
| |
|
|
|
|
Building Owner
|
Champion REIT
| | Building/Project Name |
Champion Tower
| |
Systems |
| |
Building Types |
Commercial - Office
|
Description of the building:
|
| South-west facing office unit at 25/F of Grade A office building in Central
Retrofitted initiative:
- To improve solar shading performance of current curtainwall glass and hence cooling energy saving for the office unit.
- To improve thermal comfort of office unit occupants.
- To stabilise indoor air temperature in sunny and cloudy days.
- To validate solar shading and energy saving improvement for consideration of full scale retrofit for the whole building. Validation was done by HK Polytechnic University
Typical Details for BVG
Observed benefits other than energy saving:
- Improved thermal comfort.
- Improved sound reduction from 35 to 40dB (Rw).
- Reduced UV light transmittance to indoor to 5%.
- Reduced glass indoor reflectance from 47% to 35%.
- Eliminated condensation on glass at cold morning time.
- Stabilised solar heat flow to indoor.
General observations of the retrofitting project:
- The measured data indicates that, for both sunny day and cloudy day, the VIG retrofit can effectively stabilise the inside surface temperature of the window glass and significantly reduce the heat gain through windows.
- The risk of condensation on the insider surface of windows can be eliminated because of the VIG retrofit as the inside glass surface temperature is higher in winter.
- For VIG retrofit on this glass in the building, the energy-saving potential is 8.4% - 32.1% for different orientation.
- A higher cooling setpoint temperature for the indoor space is possible for additional energy saving without compromising the indoor thermal comfort. The potential saving is 25.2 kWh/m2 (floor area) when cooling set point is increased by 1ºC.
- The OTTV is reduced by around 70% to 11 W/m2 level.
- Annual energy saving per window area HK$150.82/year.
- Reduce the carbon emission of 63.8 kg CO2-e/ m2 (window area).
Other information:
Installation
| Cost |
Saving |
| Total cost: |
HKD 26,730 |
Total savings/year: |
HKD 2,443 (first year) |
| Payback: |
8.25 years for case office unit
4.58 years for west facing office units |
| Award |
| Award received by the project: |
CIC Green Product Certificate (Platinum) for vacuum glass |
| Subsidy/ Funding |
| The project is supported by: |
Building owner |
| |
|
|
|
|
