Design And Performance Research Of One-way Heat Transfer Module Integrated Onto Walls Of Buildings In The Highland With High Altitude

In this paper,a passive one-way heat transfer wall is designed based on the radiation resources of the building wall,gravity heat pipe as the heat conducting element and water tank as the heat storage and heat release part,aiming at the climate characteristics of high altitude and low latitude area.The problem of indoor temperature regulation in the winter and night without cooling in summer is solved,and some domestic hot water is provided by using the wall.Based on the law of daily earth movement and the empirical relationship between collires Pereira and Rabl,the mathematical correlation formula is established to calculate the lighting quantity of building vertical wall and the ground radiation,latitude and azimuth.Based on this,the influence of geographic latitude,wall azimuth and climate characteristics on the annual,seasonal and monthly lighting of wall surface is analyzed based on the analysis of the average ground solar radiation resources of 35 meteorological stations in China,The empirical correlations between the ratio of annual,winter / summer daylight and ground radiation to geographic latitude,building azimuth and air transparency index were found.The results show that the south wall of buildings in low latitude and high altitude areas represented by Lhasa and Kunming is very suitable for the installation of solar energy systems such as solar heating system for winter use,while the west wall is suitable for installing solar system in summer,but any wall is not suitable for installing solar system for the whole year.According to the climate characteristics of Kunming and the need of building heating in winter,a functional building module of heat transfer and heat storage based on heat pipe is constructed;The influence of the diameter,shell thickness,filling rate,pressure in the tube,installation angle and shape of the heat pipe on the heat transfer performance of the heat transfer module is analyzed;The influence of unit area thickness of heat storage module on wall temperature is calculated.The heat demand of actual unit area is calculated.The ratio of passive wall area installed on different vertical wall to indoor horizontal area is proposed.In order to detect the effect of the module on improving the indoor thermal environment in winter,an experimental platform was built.The experimental results showed that the maximum daily efficiency of the device was 48.041%,and the average heat efficiency of seven days was 44.894%.The passive wall installed in the west wall receives 310.66 MJ of solar radiation per square meter module in January of winter,and releases 62.772 MJ of heat for indoor;Compared with the room without module,the indoor temperature can be increased by 2 ℃ ～ 3 ℃ at night.When the temperature drops suddenly,the passive wall can release 6.018 mj per unit area per day,and the average indoor temperature per day can be 3 ℃ higher than that of the control room.The results show that the module can effectively control the indoor temperature,reduce the fluctuation of indoor temperature,make the indoor environment more comfortable and can effectively reduce the use of conventional energy.