|
Building Owner
|
Synco (H.K.) Ltd.
|
Using advance control algorithm to improve energy efficiency and operational performance for major equipment and building services systems
| | Building/Project Name |
No. 7 Tai Shun Street Tai Po Industrial Estate
| | Systems |
Building Automation /Management System
| | Building Types |
Industrial
|
Description of the building:
The pharmaceutical factory building has a gross floor area of around 3,500 square meters.
The cleanrooms in the factory are served by an HVAC system that consists of three water-cooled chillers and two boilers.
On the air side, fresh air is cooled by the PAU and mixed with recirculation air in the AHUs. Cooling coils and heating coils are installed in the AHUs for temperature and humidity control. To maintain the required cleanliness in the cleanrooms, high recirculation airflow is maintained and passes through HEPA filters. Room static air pressure is also controlled to prevent particle transmission from lower-level spaces to higher-level spaces. |
|
 |
Retrofitted initiative:
The initiative primarily focused on the control of air-side systems. The cleanrooms have specific control requirements for indoor air temperature, relative humidity, recirculation airflow rate, and room static air pressure. The air handling processes for these requirements interact with each other, making the control challenging. A smart optimal control strategy was developed, tested, and implemented in the HVAC system.
After the retrofitting, the dehumidification process was decoupled from other air handling processes, resolving the cooling and heating counteraction problem. The energy saving rate is 42%.
Observed benefits other than energy saving:
- The indoor air temperature, relative humidity, recirculation airflow, and room static pressure are strictly maintained within the required range in all working conditions.
- Equipment operation time is reduced due to lower cooling and heating loads, thereby prolonging The lifetime of The equipment.
- Carbon emissions are reduced due to decreased electricity and town gas consumption.
General observations of the retrofitting project:
Before the retrofitting, the system consumed a significant amount of cooling and heating energy to maintain the required environment in the cleanrooms.
A set of new control strategies has been developed, tested, and implemented in the system. The new strategies were programmed into the building automation system and required no modifications to the existing hardware. With the new method, no external humidity load was introduced into the air-conditioned space, and simultaneous heating and cooling were avoided in the AHUs. The indoor air temperature and relative humidity are strictly controlled within the required range, while the recirculation airflow rate and indoor static air pressure are strictly maintained at the required level. No inconvenience was caused during the implementation work.
Other information:
| Cost |
Saving |
| Total cost: |
HKD 0.3 million for programming the control strategies into BMS |
Total savings/year: |
Over HKD 4 million |
| Saving/year breakdown: |
- The annual electricity consumption was reduced by 981,432 - 1,314,000 kWh;
- The town gas consumption was reduced by 14,561,712 - 17,520,000 MJ;
- Total annual cost saving was around HKD 4.2 - 5.1 million
|
| Payback: |
Within 1 month |
| Name of consultant and contractor |
Building Energy and Automation Research Laboratory, Department of Building Environment and Energy Engineering (BEEE), The Hong Kong Polytechnic University
|
| |
|
Using advance control algorithm to improve energy efficiency and operational performance for major equipment and building services systems
|
|
|
Building Owner
|
Synco (H.K.) Ltd.
| | Building/Project Name |
No. 7 Tai Shun Street Tai Po Industrial Estate
| |
Systems |
Building Automation /Management System
| |
Building Types |
Industrial
|
Description of the building:
|
|
The pharmaceutical factory building has a gross floor area of around 3,500 square meters.
The cleanrooms in the factory are served by an HVAC system that consists of three water-cooled chillers and two boilers.
On the air side, fresh air is cooled by the PAU and mixed with recirculation air in the AHUs. Cooling coils and heating coils are installed in the AHUs for temperature and humidity control. To maintain the required cleanliness in the cleanrooms, high recirculation airflow is maintained and passes through HEPA filters. Room static air pressure is also controlled to prevent particle transmission from lower-level spaces to higher-level spaces. |
|
|
Retrofitted initiative:
The initiative primarily focused on the control of air-side systems. The cleanrooms have specific control requirements for indoor air temperature, relative humidity, recirculation airflow rate, and room static air pressure. The air handling processes for these requirements interact with each other, making the control challenging. A smart optimal control strategy was developed, tested, and implemented in the HVAC system.
After the retrofitting, the dehumidification process was decoupled from other air handling processes, resolving the cooling and heating counteraction problem. The energy saving rate is 42%.
Observed benefits other than energy saving:
- The indoor air temperature, relative humidity, recirculation airflow, and room static pressure are strictly maintained within the required range in all working conditions.
- Equipment operation time is reduced due to lower cooling and heating loads, thereby prolonging The lifetime of The equipment.
- Carbon emissions are reduced due to decreased electricity and town gas consumption.
General observations of the retrofitting project:
Before the retrofitting, the system consumed a significant amount of cooling and heating energy to maintain the required environment in the cleanrooms.
A set of new control strategies has been developed, tested, and implemented in the system. The new strategies were programmed into the building automation system and required no modifications to the existing hardware. With the new method, no external humidity load was introduced into the air-conditioned space, and simultaneous heating and cooling were avoided in the AHUs. The indoor air temperature and relative humidity are strictly controlled within the required range, while the recirculation airflow rate and indoor static air pressure are strictly maintained at the required level. No inconvenience was caused during the implementation work.
Other information:
| Cost |
Saving |
| Total cost: |
HKD 0.3 million for programming the control strategies into BMS |
Total savings/year: |
Over HKD 4 million |
| Saving/year breakdown: |
- The annual electricity consumption was reduced by 981,432 - 1,314,000 kWh;
- The town gas consumption was reduced by 14,561,712 - 17,520,000 MJ;
- Total annual cost saving was around HKD 4.2 - 5.1 million
|
| Payback: |
Within 1 month |
| Name of consultant and contractor |
Building Energy and Automation Research Laboratory, Department of Building Environment and Energy Engineering (BEEE), The Hong Kong Polytechnic University
|
| |
|
Using advance control algorithm to improve energy efficiency and operational performance for major equipment and building services systems
|
|
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