Experimental and Theoretical Study on the Thermal Environment Based on Simultaneously Model in a Room

Abstract

A simultaneously solving model is presented for a small room with single thermal environment, and the model is used to predict inner surface temperature and air temperature. Combined heat transfer consists of thermal conduction, convection, and radiation, which exist on building inner surface temperature and air temperature that are coupled through each other. The construction thought of simultaneously solving model: Based on the principle of energy conservation, heat conservation equations are established for inner surface by considering thermal conduction, convection, and radiation, and air heat conservation equations are also established by using indoor air as control volume. Inner surface temperature and air temperature can be received by simultaneously solving and iterative calculation. Direct radiation absorption model and Gebhart absorption coefficient model are considered, respectively, in heat conservation equations of simultaneously solving model. Taking environmental laboratory (5 × 3.5 × 2.5 m) as physical model, condition calculation and experimental verification have taken. Under variety of conditions such as different wall heat flow and different air supply volume, inner surface temperature and air temperature are calculated by simultaneously solving model. The simultaneously solving model based on Gebhart absorption coefficient model is more exact than the model based on direct radiation absorption model. The calculation results of two kinds of simultaneously solving model are compared with test date and provide some important information for applying radiation model of simultaneously solving model.