|
Building Owner
|
Government Property Agency
|
Conversion to demand fresh air control system coupling with exhaust air system
| | Building/Project Name |
Queensway Government Offices
| | Systems |
HVAC - Carpark Mechanical Ventilation System
Building Automation /Management System
| | Building Types |
Commercial - Office
|
Description of the building:
Queensway Government Offices (QGO) was completed in 1985, located at 66 Queensway, Admiralty. It consists of 5-storey Low Block and 47-storey High Block, with a total gross floor area of approximately 60,000 sqm. It is a government property that consists of various government departments, such as Department of Justice, Architectural Services Department and Food and Environmental Hygiene Department.
Retrofitted initiative:
This replacement project has the initiatives of energy efficiency, sustainability and innovation.
In the chillers selection process, data collection on cooling load was carried out in th first place. The data was then utilized to develope a new energy model for the prediction of energy-savings. The analysis revealed that the proposed combination of R-514A VFD centrifugal water-cooled chillers was superior in terms of energy saving.
The selection of chillers also took the consideration of sustainability. The refrigerant R-514A is the latest generation HFO refrigerant that has Ozone Depletion Potential (ODP) of 0 and Global Warming Potential (GWP) of 2. Given its higher toxicity classification (B1), safety measures were implemented in the QGO chiller plant room, including a refrigerant leakage detection system, an eye-washing facility, and regular safety drills for refrigerant leakage incidents.
Innovative ideas were incorporated into the project to enhance construction processes and equipment monitoring. Building Information Modelling (BIM) was utilized during the construction stage to minimize clashes and reduce project delays. For operation and maintenance, the new chillers allow for monitoring through mobile app. This enables the operation team to access real-time data wirelessly, providing crucial information on chiller operation and energy performance
Observed benefits other than energy saving:
- Better sustainability. The new generation HFO refrigerant R-514A has ODP of 0 and GWP of 2.
- The new chillers had lower noise level than conventional chillers, which could benefit working environment on-site.
- Reduced maintenance resources in plants operations and future retro-commissioning
General observations of the retrofitting project:
- Upon all 4 chillers were replaced, it is estimated that 1,280,000 kWh could be saved per year. This is equivalent to approximately HKD 1,500,000, when estimated using HKD 1.2 per kWh.
- The operation COP is closely monitored, and it has been aligning with the expected manufacturer COP.
Other information:
| Cost |
Saving |
| Total cost: |
HKD 14,000,000 |
Total savings/year: |
HKD 1,500,00 |
| Payback: |
Approx. 9 years |
| Awards |
| Awards received by the project: |
• First Place - ASHRAE Hong Kong Chapter Technology Award 2021
• Second Place - ASHRAE XIII Region Level Competition
• Honorable Mention - ASHRAE Society Level Competition |
| |
|
Conversion to demand fresh air control system coupling with exhaust air system
|
|
|
Building Owner
|
Government Property Agency
| | Building/Project Name |
Queensway Government Offices
| |
Systems |
HVAC - Carpark Mechanical Ventilation System
Building Automation /Management System
| |
Building Types |
Commercial - Office
|
Description of the building:
|
| Queensway Government Offices (QGO) was completed in 1985, located at 66 Queensway, Admiralty. It consists of 5-storey Low Block and 47-storey High Block, with a total gross floor area of approximately 60,000 sqm. It is a government property that consists of various government departments, such as Department of Justice, Architectural Services Department and Food and Environmental Hygiene Department.
Retrofitted initiative:
This replacement project has the initiatives of energy efficiency, sustainability and innovation.
In the chillers selection process, data collection on cooling load was carried out in th first place. The data was then utilized to develope a new energy model for the prediction of energy-savings. The analysis revealed that the proposed combination of R-514A VFD centrifugal water-cooled chillers was superior in terms of energy saving.
The selection of chillers also took the consideration of sustainability. The refrigerant R-514A is the latest generation HFO refrigerant that has Ozone Depletion Potential (ODP) of 0 and Global Warming Potential (GWP) of 2. Given its higher toxicity classification (B1), safety measures were implemented in the QGO chiller plant room, including a refrigerant leakage detection system, an eye-washing facility, and regular safety drills for refrigerant leakage incidents.
Innovative ideas were incorporated into the project to enhance construction processes and equipment monitoring. Building Information Modelling (BIM) was utilized during the construction stage to minimize clashes and reduce project delays. For operation and maintenance, the new chillers allow for monitoring through mobile app. This enables the operation team to access real-time data wirelessly, providing crucial information on chiller operation and energy performance
Observed benefits other than energy saving:
- Better sustainability. The new generation HFO refrigerant R-514A has ODP of 0 and GWP of 2.
- The new chillers had lower noise level than conventional chillers, which could benefit working environment on-site.
- Reduced maintenance resources in plants operations and future retro-commissioning
General observations of the retrofitting project:
- Upon all 4 chillers were replaced, it is estimated that 1,280,000 kWh could be saved per year. This is equivalent to approximately HKD 1,500,000, when estimated using HKD 1.2 per kWh.
- The operation COP is closely monitored, and it has been aligning with the expected manufacturer COP.
Other information:
| Cost |
Saving |
| Total cost: |
HKD 14,000,000 |
Total savings/year: |
HKD 1,500,00 |
| Payback: |
Approx. 9 years |
| Awards |
| Awards received by the project: |
• First Place - ASHRAE Hong Kong Chapter Technology Award 2021
• Second Place - ASHRAE XIII Region Level Competition
• Honorable Mention - ASHRAE Society Level Competition |
| |
|
Conversion to demand fresh air control system coupling with exhaust air system
|
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