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Sustainable Police HQ in Hong Kong

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©2023 This excerpt taken from the article of the same name which appeared in ASHRAE Journal, vol. 65, no. 10, October 2023.

About the Author
Ken C.K. Yeung is chief building services engineer, H.L. Tang is a senior project manager, and Allison Y.M. Law is a project manager in the Architectural Services Department in Hong Kong, China.

The new Kowloon East Regional Police Headquarters and Operational Base cum Ngau Tau Kok Divisional Police Station (KERHQ) was designed for high energy efficiency with reference to ASHRAE Standard 90.1-2016 and the 2015 to 2018 ASHRAE Handbook. To achieve a green government building with emphasis on building energy efficiency and sustainability, many sustainable elements including energy efficiency features (EEFs) and renewable energy technologies (RETs) were adopted.

Building Envelope

A low window-to-wall ratio of 0.35 and glazing with a low shading coefficient of 0.29 were adopted, which were 46% and 55% lower than the baseline building model set to achieve an overall thermal transfer value (OTTV) barely meeting the threshold stipulated in the Code of Practice for Overall Thermal Transfer Value in Buildings issued by the Buildings Authority of Hong Kong.

The OTTV of 14 W/m2 (1.3 W/ft2) was achieved, which was about 58% less than the statutory requirement. A vertical green wall was constructed on the west façade to enhance the building performance by reducing heat gain from the western exposure. Shading fins were also installed to avoid excessive solar radiation, taking the sun’s path into consideration.

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