Short Circuit and Mixing Loss due to Inappropriate Layout of Openings for HVAC system

Abstract

Several types of ceiling air diffuser form the attached air jet along the ceiling which diffuses throughout a room. However, if the layout of supply openings and exhaust ones is not appropriate, the short circuit between them appears and ventilation/air-conditioning efficiency becomes very low. Additionally mixing loss between interior zone and perimeter zone may occur and make energy consumption. In this paper, flow visualization test was conducted in the office and the problems described above were confirmed. Then CFD simulations were carried out to study adequate layout of openings for HVAC system.