Effects of ceiling induction diffusers on indoor environmental quality of sickroom under the cooling air supply condition

Abstract

ABSTRACTA series of experiments were carried out in a full-scaled model room to verify the characteristics of the air-conditioning system with ceiling induction diffusers. By the step-up tracer gas method and decay method, 10 cases with three varying parameters (the positions of exhausts, the heights of the exhaust ports and the states of the curtains around the beds) were designed to examine the influence on the indoor environment. It can be found that the exhaust ports had obvious influence on the normalised concentration distributions. The curtains made the indoor temperature higher than that of in without curtains and prevent the contaminant escaping out when in patients breathed. In terms of the local mean age of air, the ventilation efficiency presented an optimum result on a specific position of the exhaust port. However, there was minor influence on the air age caused by the height of the exhaust ports.