|
Building Owner
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Housing Authority
|
Installation of indirect evaporative cooling System (IEC) for pre-cooling of primary fresh air with exhaust air
| | Building/Project Name |
A wet market at Ying Tung Estate in Tung Chung
| | Systems |
HVAC - Airside Air Conditioning System
| | Building Types |
Others - other building types
|
Description of the building:
- A wet market with a total floor area of 260 m2 for this experimental study.
- An all-fresh-air air-conditioning system.
- The cool exhaust air from the air-conditioned space cannot be reused, but exhausted through this IEC system.
- Two air handling units (AHUs) were installed for the wet trade area and each one is responsible for half of the area.
- Two rotating heat recovery wheel systems (HRW) are installed before each AHU to pre-cooling/pre-heating fresh air by recovering cold/heat from exhaust air in summer/winter.
Retrofitted initiative:
- HVAC primary fresh air system:
Two Regenerative Indirect Evaporative Coolers (RIEC) are designed and installed in parallel with the two existing heat recovery wheel (HRW) systems. The cool exhaust air from the indoor environment is introduced to the IEC secondary air channels. The fresh air is pre-cooled before it passes through the AHUs.
Observed benefits other than energy saving:
- Simple system.
- Less initial cost and operational cost.
- Shorter payback period.
General observations of the retrofitting project:
- During the renovation process, the existing HRW system could still work for fresh air pre-treating, so it will not affect the thermal comfort of people in the wet market.
- All refurbishment work is carried out in a proprietary plant room only, with no impact on other activities.
- RIECS can substitute the HRW and treat fresh air to the aimed setpoint and satisfy the thermal requirement with less energy consumption.
Other information:
- The view of plant room for central AC system
- The duct arrangement of the packed RIEC system
| Cost |
Saving |
| Total cost: |
HKD 96,000 |
Total savings/year: |
HKD 23,000 |
| Payback: |
4.17 years |
| |
|
Installation of indirect evaporative cooling System (IEC) for pre-cooling of primary fresh air with exhaust air
|
|
|
Building Owner
|
Housing Authority
| | Building/Project Name |
A wet market at Ying Tung Estate in Tung Chung
| |
Systems |
HVAC - Airside Air Conditioning System
| |
Building Types |
Others - other building types
|
Description of the building:
|
|
- A wet market with a total floor area of 260 m2 for this experimental study.
- An all-fresh-air air-conditioning system.
- The cool exhaust air from the air-conditioned space cannot be reused, but exhausted through this IEC system.
- Two air handling units (AHUs) were installed for the wet trade area and each one is responsible for half of the area.
- Two rotating heat recovery wheel systems (HRW) are installed before each AHU to pre-cooling/pre-heating fresh air by recovering cold/heat from exhaust air in summer/winter.
Retrofitted initiative:
- HVAC primary fresh air system:
Two Regenerative Indirect Evaporative Coolers (RIEC) are designed and installed in parallel with the two existing heat recovery wheel (HRW) systems. The cool exhaust air from the indoor environment is introduced to the IEC secondary air channels. The fresh air is pre-cooled before it passes through the AHUs.
Observed benefits other than energy saving:
- Simple system.
- Less initial cost and operational cost.
- Shorter payback period.
General observations of the retrofitting project:
- During the renovation process, the existing HRW system could still work for fresh air pre-treating, so it will not affect the thermal comfort of people in the wet market.
- All refurbishment work is carried out in a proprietary plant room only, with no impact on other activities.
- RIECS can substitute the HRW and treat fresh air to the aimed setpoint and satisfy the thermal requirement with less energy consumption.
Other information:
- The view of plant room for central AC system
- The duct arrangement of the packed RIEC system
| Cost |
Saving |
| Total cost: |
HKD 96,000 |
Total savings/year: |
HKD 23,000 |
| Payback: |
4.17 years |
| |
|
Installation of indirect evaporative cooling System (IEC) for pre-cooling of primary fresh air with exhaust air
|
|
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