In recent years,the number of BIPV projects is increasing gradually.Most of the studies on photovoltaic walls focus on the electrical and thermal performance of photovoltaic modules,and few studies on the optimization of the comprehensive heat transfer characteristics of photovoltaic walls of different structures combined with the thermal performance of energy-saving walls.Taking Tianjin area as the application scene,this paper establishes heat transfer models of basic wall,ordinary photovoltaic wall and new photovoltaic wall embedded with thermal insulation integrated board in accordance with the four-step energy-saving design technical index of residential buildings in Tianjin respectively.The temperature distribution and surface heat flux of the wall were numerically simulated by ANSYS FLUENT software,and the heat transfer coefficient of different types of wall and the electrical performance of photovoltaic modules were obtained by further analysis of the simulation results.The results show that,compared to basic walls,the surface heat gain of ordinary photovoltaic walls in summer can be increased by 46.88%,the surface heat loss of ordinary photovoltaic walls in winter can be reduced by 5.47%,the thickness of the insulation layer in the new photovoltaic wall should not be less than 20 mm,at this time,the maximum surface heat gain of the new photovoltaic wall in summer can be increased by 18.16%,and the minimum surface heat loss of the new photovoltaic wall in winter can be reduced by 20.07%.Based on the calculation results,the heat dissipation structural measures can be simplified when the photovoltaic modules are used in the exterior walls of buildings in cold areas such as Tianjin.
ordinary photovoltaic wallnew photovoltaic wall embedded with thermal insulation integrated boardcomprehensive heat transfer characteristics