COMPUTATION OF AIRFLOW IN A DISPLACEMENT VENTILATION/CHILLED CEILING ENVIRONMENT

摘要

Displacement ventilation combined with a chilled ceiling system have been investigated by (Kofoed, 1994), (Almadari and Eagles, 1996), (Fitzner, 1996), (Taki et al., 1996), (Loveday, et al 1998) and (Rees, 2001). However, characterisation tests in such a combination system revealed that the use of a chilled ceiling with displacement ventilation could have a detrimental effect upon the displacement flow. This paper presents an assessment of the ability to model airflow and temperature distributions in such combination environments with a standard Computational Fluid Dynamics (CFD) code. Modelling is carried out over a range of typical office conditions for a range of heat loads and ceiling surface temperatures. It was found that the CFD code could be used to successfully predict the airflow in these environments by showing good agreement with those of earlier studies. The implications for the future design of displacement ventilation and chilled ceiling environment are discussed.