Diffuser layout optimization of stratified air distribution system in different types of buildings

With a validated simulation model, investigates the influence of diffuser layout on the thermal comfort and energy saving potential of stratified air distribution (STRAD) systems applied to different types of building spaces. The results indicate that for small buildings, the induction effect of the return air inlets on the indoor air distribution should be noticed to avoid the thermal comfort problems caused by “short circuit” phenomenon of the cold air. But for large space buildings with wide horizontal span, air supply diffusers should be arranged surrounding the occupied zone as uniform as possible, so as to improve the uniformity of the indoor air distribution and the thermal comfort in the lower zone. The return air inlets should be designed to the low air temperature area of lower occupied zone, in order to reduce the cooling load and improve the energy saving capacity of the STRAD systems. Furthermore, the enhancement of the thermal plume flow along with exterior walls is beneficial for further energy conservation of the STRAD systems.