Comparison of diffuser model in numerical simulation for task air conditioning

This paper is concerned with the different methods to present inlet condition for computational fluid dynamics (CFD) simulation of task air conditioning (TAC). The boundary conditions at the supply opening have a strong influence on the flow in the room, and they are, therefore, very important. Usual methods are outlined. Comparison and analysis are then given. The terminal device of TAC is close to people and is relatively large compared to the dimension of the occupied zone. The occupied zone is in the forward flow zone, not return flow zone. Sufficient description of the diffuser is very important for the prediction of the flow in whole room. The authors prefer to generate the boundary conditions at diffuser by CFD simulation. Computer-generated supply openings give a good description of flow not only in the room but also in the diffuser. For comparison, the basic method among usual supply opening models was used.