Abstract
Installing outdoor units of air-cooled, separated type packaged air-conditioners in a concentrated way can reduce their cooling capacity and overall efficiency due to a temperature rise in the cooling air caused by a short circuiting of the exhaust air. Systematic reduced scale model experiments were carried out with the aim of relating the geometric configuration of grouped outdoor units to the resultant temperature rise of suction air under stagnant surrounding conditions. Experimental data together with theoretical consideration of a new structure around the outdoor units were summarized into a model equation using two parameters. Observed peak temperature rise of suction air and its spatial distribution were both well reproduced using the prediction method based on the proposed model equation.
