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Green Initiative Item 9 – Solar Films/ Motion Sensors

Solar heat gain is one of the heat sources in an air conditioned space. Reducing solar heat gain can save air conditioning energy, especially in summer time. It is estimated that the solar heat gain through glazing can account for 15% - 20% of the air conditioning cooling load. Hence, reducing solar heat gain through windows can save energy.

A typical motion sensor is comprised of a motion detector, electronic control component, relay and power supply. Motion detectors are typically infrared type or ultrasonic sensors. Motion sensors can reduce a building's lighting energy by turning lights off in unoccupied spaces. The amount of saving is highly dependent on the occupancy pattern.

The Environment and Conservation Fund (ECF) relevant Vetting Subcommittees approved a total of 2 TWGHs schools for TWGHs solar film pilot project, and the Administration Headquarters and 2 community services centres for TWGHs motion sensor pilot project. Details of the services units and the work progress are listed below:

Solar Film

Services Units Work Progress
TWGHs Li Ka Shing College Completed
TWGHs Chan King Har Kindergarten Completed

Motion Sensor

Services Units Work Progress
Administration Headquarters Completed
TWGHs Fong Shu Chuen Social Service Building Completed
TWGHs Jockey Club Rehabilitation Complex Completed

Solar films in TWGHs Li Ka Shing College
TWGHs Li Ka Shing College

Solar films in TWGHs Chan King Har Kindergarten
TWGHs Chan King Har Kindergarten
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