Development of Zonal Model for Predicting Temperature Distribution inside an Office Room with Hybrid Air-conditioning System

Recently, the hybrid air-conditioning system that used natural ventilation together with a mechanical air-conditioning was proposed. Hybrid air conditioning system is expected to be saving energy and maintain keep indoor thermal environment comfort.
The purpose of this study is to develop a simplified numerical model that predicts distribution of indoor air temperature when the office room is air-conditioned by hybrid air-conditioning. An office room with hybrid air-conditioning system with wind-driven ventilation as natural ventilation was used by object of this study. The temperature distribution can be calculated by solving the equations of air balance and heat balance in each zone. The results of CFD analysis are assumed to be a correct answer in this paper. The air temperature prediction of zonal model was compared with the results of CFD analysis to optimum solution.