|
Building Owner
|
Swire Properties Limited
|
Installation of auto-cleaning devices for condensers of water-cooled chillers
| | Building/Project Name |
Devon House
| | Systems |
HVAC - Waterside Air Conditioning System
| | Building Types |
Commercial - Office
|
Description of the building:
- A 29-storey Grade-A office building with 4 basements floors.
- Served by 4 nos. of water-cooled chillers with VSD.
|
|
 |
Retrofitted initiative:
- Installation of automatic tube cleaning system (ATCS) for condenser of water-cooled chillers
Automatic cleaning system for the inner surface of condenser tubes of water-cooled chillers. One ATCS can serve two chillers at Devon House.
Observed benefits other than energy saving:
- Better efficiency operation of the condenser as well as overall efficiency of the chiller plant.
- Reduce maintenance cost and manpower for periodic manual cleaning.
General observations of the retrofitting project:
- VSD Chiller (seawater-cooled) was unable to operate at designed condition.
- Seems the operating pattern more like constant speed, as frequency was limited to 46-50Hz and IGV adjusted to match load.
- Condenser refrigerant temperature is high (high approach temperature and condensing water inlet temperature, due to seawater quality).
- RIECS can substitute the HRW and treat fresh air to the aimed setpoint and satisfy the thermal requirement with less energy consumption.
Other information:
- Installation of automatic tube cleaning system (ATCS) for condenser of water-cooled chillers
- Monitoring of approach temperature to determine condensing tube cleaning.
- Optimize condensing water loop to lower condensing water inlet temperature.
- Frequency able to reduce, down to 35Hz, and fluctuate to match load while IGV remains at 100% opening.
| Cost |
Saving |
| Total cost: |
HKD 520,000 |
Total savings/year: |
HKD 220,000 (for 2 chillers) |
| Payback: |
2.4 years |
| |
|
Installation of auto-cleaning devices for condensers of water-cooled chillers
|
|
|
Building Owner
|
Swire Properties Limited
| | Building/Project Name |
Devon House
| |
Systems |
HVAC - Waterside Air Conditioning System
| |
Building Types |
Commercial - Office
|
Description of the building:
|
|
- A 29-storey Grade-A office building with 4 basements floors.
- Served by 4 nos. of water-cooled chillers with VSD.
|
|
|
Retrofitted initiative:
- Installation of automatic tube cleaning system (ATCS) for condenser of water-cooled chillers
Automatic cleaning system for the inner surface of condenser tubes of water-cooled chillers. One ATCS can serve two chillers at Devon House.
Observed benefits other than energy saving:
- Better efficiency operation of the condenser as well as overall efficiency of the chiller plant.
- Reduce maintenance cost and manpower for periodic manual cleaning.
General observations of the retrofitting project:
- VSD Chiller (seawater-cooled) was unable to operate at designed condition.
- Seems the operating pattern more like constant speed, as frequency was limited to 46-50Hz and IGV adjusted to match load.
- Condenser refrigerant temperature is high (high approach temperature and condensing water inlet temperature, due to seawater quality).
- RIECS can substitute the HRW and treat fresh air to the aimed setpoint and satisfy the thermal requirement with less energy consumption.
Other information:
- Installation of automatic tube cleaning system (ATCS) for condenser of water-cooled chillers
- Monitoring of approach temperature to determine condensing tube cleaning.
- Optimize condensing water loop to lower condensing water inlet temperature.
- Frequency able to reduce, down to 35Hz, and fluctuate to match load while IGV remains at 100% opening.
| Cost |
Saving |
| Total cost: |
HKD 520,000 |
Total savings/year: |
HKD 220,000 (for 2 chillers) |
| Payback: |
2.4 years |
| |
|
Installation of auto-cleaning devices for condensers of water-cooled chillers
|
|
|
