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Indoor and Built Environment
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Equations for a Ventilation Design Derived from Computational Fluid Dynamics

W.K. Chow

Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China

L.T. Wong

Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China

Computational fluid dynamics (CFD) was used in a study of the air flow char acteristics in the occupied building zone. Correlation equations between the mean air speeds and the percentage dissatisfied with the macroscopic flow numbers were derived. Ten macroscopic flow numbers including the total ventilation rate, the air change rate, ventilation rate, air diffusion performance index, modified jet momentum number, two new flow numbers and three expressions of jet momentum ratio were investigated. A total number of 25 numerical experiments under isothermal flow conditions with four different geometrical arrangements (labelled A-D) were performed. The correlation equations derived from CFD were compared with those obtained from experi mental studies. It is found that the jet momentum ratio RM2 gives the equation with the best correlation coefficient and so is recommended for ventilation design.

Key Words: Computational fluid dynamics • Ventilation

Indoor and Built Environment, Vol. 7, No. 5-6, 276-288 (1998)
DOI: 10.1177/1420326X9800700505
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