Influence Of Different Total Heat Transfer Coefficient Of South Wall On Solar Energy Absorption In Winter

The rapid development of China's economy has pushed China's urbanization construction to a new stage of development.However,the booming construction industry has also brought about a series of problems.For example,due to the increased demand for energy in the construction industry,building energy consumption accounts for an increasing proportion of the total energy consumption in China.At present,as heating behavior is becoming more common in hot summer and cold winter regions,the growth rate of heating energy consumption is also accelerating.However,due to the comprehensive factors such as geographical location,the indoor and outdoor temperature difference in the region is significantly smaller than that in the northern region,so solar energy plays a greater role in reducing heating energy consumption.In the winter,the effective absorption of solar energy by the South Wall is of great significance in reducing the energy consumption of buildings.When solar energy also enters the room in the form of heat,it reduces the building's energy consumption.To this end,this paper will analyze the effects of solar energy on building energy efficiency in winter hot and cold winter areas under different solar radiation intensity and total heat transfer coefficient of different envelope structures.This paper takes the typical city of Shanghai in the middle and lower reaches of the Yangtze River as the representative,and uses CFD numerical simulation method to discuss the study of different wall insulation methods,different solar radiation intensity(cloudy,overcast,sunny)and four different envelope structures.When the heat coefficient is used,the south wall gets solar energy.The research results show that the temperature of the outer surface of the south wall is increased after the solar energy is absorbed,so some of the solar energy absorbed by the wall is lost to the atmosphere through convective heat transfer.Although the larger heat transfer coefficient of the south wall will lead to greater heat transfer by the temperature difference between the indoor and outdoor,the lower the overall temperature of the south wall is,which is beneficial to the actual absorption effect of the wall on solar energy,so the heat transfer coefficient is larger,south.The temperature difference heat transfer loss of the wall is more,but when the heat transfer coefficient is increased by four times,the total heat loss of the outer surface of the south wall is only 1.5 times higher.Therefore,after improving the insulation performance of the south wall to a certain extent in this area,it is possible to suppress the actual absorption of solar energy.Therefore,the design of the thermal insulation performance of the south wall of the building in the hot summer and cold winter zone should take into account the actual absorption effect of solar energy.