Gemalto Pte Ltd
Gemalto Pte Ltd is a digital security company, providing secure personal devices such as smart cards and tokens in addition to software applications and managed services.
Chiller plant optimisation
The existing chillers and associated equipment were overhauled and optimised. The result was a 30% improvement in chiller system efficiency.
AHU Retrofitting & Optimization
CO2-based controllers were installed to modulate fresh air intake into the AHUs. Ducts were reworked to increase return air flow into AHUs. Control valves were replaced.
|Implementation cost || S$228,000|
| Annual energy savings|| 1,338 MWh|
| Annual cost savings|| S$270,000|
| Payback period|| 0.8 years|
Molex Singapore Pte Ltd
Molex Singapore is a leading manufacturer of electronic and fibre optic connectors and interconnect components.
The energy appraisal of facility covered the chilled water system, air distribution system, compressed air system, lighting system and process cooling system.
Energy saving measures
Energy saving measures identified from the energy appraisal and subsequently implemented are:
- Replacing chiller with proper sizing and optimizing of chiller operations.
- Reducing energy consumption of pumps and cooling towers through use of variable speed drives (VSDs) to control flow rate
- Replacing metal halide lamps and fluorescent lamps with energy efficient induction lamps and LEDs
- Retrofitting of air compressors with modern efficient models and rectifying compressed air leakages
The above measures yielded Molex Singapore substantial annual energy savings with a short simple payback period.
|Annual energy savings||2,475 MWh|
|Annual cost savings||S$628,200|
|Payback period||1.8 years|
Senoko Energy Supply Pte Ltd
Senoko Energy is a power generation and retail company located in the northern part of Singapore.
Combine-Cycle Plant improvement works
Combine-Cycle Plant Re-heater Spray Valves and Combined-Cycle Plant High Pressure Spray Valve were discovered passing (allowing fluid to pass through despite being completely closed) and the defects were rectified during the planned shutdowns of the units. Steam that was initially lost through the passing valves can thereafter be utilised to generate more energy resulting in energy savings.
|Annual energy savings||2,340 MWh|
|Annual cost savings||S$230,000|
|Payback period||0.2 years|
Singapore Oxygen Air Liquide Pte Ltd (SOXAL)
Singapore Oxygen Air Liquide Pte Ltd (SOXAL) is an industrial gas company in South-east Asia, providing gases, equipment, services and packaged solutions to the Singapore manufacturing industry.
Shutting down of chiller plant at night
Before the implementation of this measure, the chiller plant was operated 24 hours daily although the facility only operates from 8am to 7pm on a 5.5-day week. The main reason for this was to prevent condensation from taking place.
The shutdown sequence was modified such that the Air Handling Units (AHUs) are switched off only after a period of time where the supply, exhaust and scrubber fans have stopped operation. This minimised condensation problems.
Retrofit of chiller plant
The existing chillers and associated pumps were replaced with more efficient ones. As a result, the chiller system efficiency improved by 38%.
Variable speed drives (VSDs) were installed on the new chilled water pumps, allowing them to run at a speed proportional to the cooling load demand.
|Annual energy savings||2,200 MWh|
|Annual cost savings||S$324,000|
|Payback period||0.8 years|
Systems on Silicon Manufacturing Co. Pte Ltd (SSMC)
Systems on Silicon Manufacturing Co. Pte Ltd (SSMC) is a semiconductor fabrication company offering CMOS, Embedded flash, Analog and Mixed Signal, RF and BCD process technologies provider of Embedded flash, Analog Mixed Signal, Power and CMOS foundry services.
Optimisation of chillers
To optimise SSMC's chillers, an optimal level of refrigerant charging was determined for best chiller efficiency. In addition, a controller was implemented to control and maintain optimal performance of the chillers under all operating or loading conditions.
|Annual energy savings||2,500 MWh|
|Annual cost savings||S$319,000|
|Payback period||0.2 years|