Carbon Dioxide (CO2) Sensors are provided to regulate outdoor air supply to the stations. Installation of CO2 sensors automatically adjust fresh air supply rates to the station public areas while ensuring CO2 level is below 1000ppm. This measure reduces energy consumption of the air-conditioning system without compromising air quality. The estimated reduction in energy is up to 0.36% of a typical station’s power consumption.Variable Speed Drives are also provided for Chilled Water Pumps and Cooling Towers. The use of variable speed drives helps to reduce the energy consumption of chilled water pumps and cooling towers during part load operation, with estimated reduction of up to 0.4% in station power consumption.Temperature sensors are provided in some mechanically-ventilated plant rooms, ...the possibility of utilising natural lighting is often explored to reduce the lighting energy consumption.for example, Service Transformer, 22Kv switchroom, etc., to cut-in and cut-out the fans so that the fans only run when necessary, thus leading to further energy savings (Table 1).
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