Compared with traditional photovoltaic (PV) cells, bifacial PV cells can generate electricity on both sides. The study aims to research the electricity generation improvement of bifacial PV module as building envelope, and to find factors affecting its power generation performance in order to optimize it. A prefabricated building was renovated with two facades and the roof installed with bifacial PV modules. A test rig was established to monitor the electricity generation of the bifacial PV facades and roof, as well the indoor illuminance. It was found that the roof had the highest power generation per unit area. The electricity generation of bifacial PV module was simulated and validated. Through the simulation, the electricity improvement of the bifacial PV module was about 4.7%–18.8%. Then the simulation model was used to research the important factors to improve bifacial PV modules. The correlation between indoor light environment and bifacial PV power generation improvement is found. With the increase of reflectivity of the inner surface properly, the improvement of electricity was increased until the reflectivity of the ceiling reaches 0.8. In addition, the best coverage of bifacial PV was found. This study will provide optimization guidance for the application of bifacial PV modules in buildings envelope.

与传统的光伏（PV）电池相比，双面PV电池可以在两侧产生电能。该研究旨在研究双面光伏组件作为建筑围护结构的发电改进，并找出影响其发电性能的因素以对其进行优化。翻新的预制建筑有两个立面，屋顶安装了双面光伏组件。建立了一个测试台，以监控双面光伏立面和屋顶的发电量以及室内照度。发现屋顶具有每单位面积最高的发电量。对双面光伏组件的发电进行了仿真和验证。通过仿真，双面光伏组件的电力改善约为4.7％–18.8％。然后利用仿真模型研究了改进双面光伏组件的重要因素。发现室内光环境与双面光伏发电改善之间的相关性。随着内表面反射率的适当增加，电力的提高会不断增加，直到天花板的反射率达到0.8。此外，发现双面PV的最佳覆盖范围。这项研究将为双面光伏组件在建筑物围护结构中的应用提供优化指导。找到了双面PV的最佳覆盖范围。这项研究将为双面光伏组件在建筑物围护结构中的应用提供优化指导。找到了双面PV的最佳覆盖范围。这项研究将为双面光伏组件在建筑物围护结构中的应用提供优化指导。