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Indoor and Built Environment
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Effect of Air Supply Temperature on the Performance of Displacement Ventilation (Part I) - Thermal Comfort

Zhang Lin

Division of Building Science and Technology, City University of Hong Kong, bsjzl{at}cityu.edu.hk

T. T. Chow

Division of Building Science and Technology, City University of Hong Kong

C. F. Tsang

Division of Building Science and Technology, City University of Hong Kong

L. S. Chan

Division of Building Science and Technology, City University of Hong Kong

K. F. Fong

Division of Building Science and Technology, City University of Hong Kong

The effect of the air supply temperature on the performance of a displacement ventilation (DV) system has been investigated. The study looks into the case of a typical office building in Hong Kong, under local thermal environment and airflow conditions. These are characterised by the high cooling load density, which commonly occurs in Hong Kong. The lower supply temperatures were found to result in higher draft effects, yet increasing temperatures leads to an increase in the predicted percentage of dissatisfied people (PPD). The DV system was found to provide acceptable thermal comfort at certain air supply temperatures. The levels of PPD could be marginal should the parameters of the system not be optimised.

Key Words: Displacement ventilation • Thermal comfort • Air velocity • Percentage of dissatisfied people (PD) • Predicted percentage of dissatisfied people (PPD) • Air supply temperature

Indoor and Built Environment, Vol. 14, No. 2, 103-115 (2005)
DOI: 10.1177/1420326X05052563
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