Numerical Simulation Study of the Influence of Building Exterior Windows on Indoor Thermal Environment in Zhangjiakou Area

Abstract

Under natural conditions in winter in Zhangjiakouarea, taking hollow glass (3+12+3mm) window as an example, the influence of external windows on indoor thermal environment under natural conditions in winter was simulated, and the cold radiation condition of external windows after adding external thermal insulation curtain was also simulated using DO radiation model in CFD. The simulation results showed that the exterior windows have a strong cold radiation effect on the indoor thermal environment in the winter night in Zhangjiakou area. The effect of cold radiation can strengthen indoor air natural convection, and enhance the convection heat transfer between external windows and indoor warm air, and then results in heat loss. After installing external thermal insulation curtain, the total heat loss is reduced by 48%, which can effectively improve the cold radiation effect of external window glass. The spatial distribution of temperature and heat flux on the inner surface of the outer window is simulated and analyzed in order to provide reference for the evaluation of indoor thermal environment and energy consumption of the outer window.