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Indoor and Built Environment, Vol. 15, No. 4, 333-346 (2006)
DOI: 10.1177/1420326X06067904

Effects of Headroom on the Performance of the Displacement Ventilation System

Zhang Lin

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

T. T. Chow

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

C. F. Tsang

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

K. F. Fong

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

L. S. Chan

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

A numerical simulation applying a validated computational fluid dynamics model was used to investigate the effect of the headroom on a displacement ventilation (DV) system. Two different headroom heights in a space were simulated and compared. It was found that the effect of increased headroom was to improve the thermal comfort of the indoor space. It was also concluded that given the thermal boundary conditions commonly encountered and the typical low headroom found in Hong Kong, DV was found to work effectively in terms of thermal comfort and indoor air quality (IAQ).

Key Words: Displacement ventilation • Computational fluid dynamics • Ventilation • Indoor air quality • Thermal comfort • Headroom


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