Outdoor thermal comfort study in a sub-tropical climate: a longitudinal study based in Hong Kong |
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Authors: | Vicky Cheng Edward Ng Cecilia Chan Baruch Givoni |
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Institution: | (1) Department of Architecture, University of Cambridge, 1–5 Scroope Terrace, Cambridge, CB2 1PX, UK;(2) School of Architecture, The Chinese University of Hong Kong, 5/F Wong Foo Yuan Building, Shatin, New Territories, Hong Kong;(3) City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;(4) Department of Architecture, University of California Los Angeles (UCLA), Los Angeles, CA, USA |
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Abstract: | This paper presents the findings of an outdoor thermal comfort study conducted in Hong Kong using longitudinal experiments—an
alternative approach to conventional transverse surveys. In a longitudinal experiment, the thermal sensations of a relatively
small number of subjects over different environmental conditions are followed and evaluated. This allows an exploration of
the effects of changing climatic conditions on thermal sensation, and thus can provide information that is not possible to
acquire through the conventional transverse survey. The paper addresses the effects of changing wind and solar radiation conditions
on thermal sensation. It examines the use of predicted mean vote (PMV) in the outdoor context and illustrates the use of an
alternative thermal index—physiological equivalent temperature (PET). The paper supports the conventional assumption that
thermal neutrality corresponds to thermal comfort. Finally, predictive formulas for estimating outdoor thermal sensation are
presented as functions of air temperature, wind speed, solar radiation intensity and absolute humidity. According to the formulas,
for a person in light clothing sitting under shade on a typical summer day in Hong Kong where the air temperature is about
28°C and relative humidity about 80%, a wind speed of about 1.6 m/s is needed to achieve neutral thermal sensation. |
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