The Cold Radiation Characteristics Research Of Building External Window In The Severe Cold Area

The cold winter in the severe cold region,the outdoor temperature is very low,the building outside the window and the external environment has a strong heat exchange,the indoor staff near the window will be cold radiation obviously and feel more cold with uncomfortable feeling.In view of this phenomenon,this paper does not consider the influence of solar radiation and analyzes the outside window cold radiation effects in winter night,so as to explore ways to improve the exterior glass cold radiation from the mechanism,and proposed the use of an external curtain to reduce the application effect of window cold radiation to provide a theoretical basis.Firstly,the thermal environment parameters of the experimental chamber were measured under the natural condition of winter in severe cold region and analyzed the effect of indoor thermal environment characteristics under window cold radiation according to the experimental results.The heat loss of the various parts of the hollow glass is calculated,the calculation results show that the radiation heat transfer heat transfer loss is the main form of ordinary insulating glass,and the total heat loss ratio increases with the increase of the temperature difference between the indoor and outdoor experiments,the final the effect of external insulation curtain to improve windows cold radiation phenomenon is tested.This article also use the CFD numerical simulation method to simulate the heat transfer characteristics of a single three-dimensional hollow glass model.At the same time,this paper combines the actual conditions,adopt a new thermal boundary condition setting method,which is based on information given to outdoor weather outside the window glass thermal boundary conditions,results show that this method is more close to the actual value of the simulation.Furthermore,the indoor thermal environment of the whole building is simulated,and the influence of the external window on the indoor thermal environment can be obtained by the temperature and velocity distribution nephogram.The results show that the temperature distribution of the indoor air in the severe cold region in winter is obviously stratified by the cold radiation of the outer window,which leads to the serious uneven temperature field in the room.When adding external curtains,curtains can be significantly weakened external window heat radiation heat loss,greatly reduces the asymmetric radiation indoors,the indoor thermal comfort environment improvement effect,should be widely popularized and applied in severe cold area.