Energy performance of an innovative bifacial photovoltaic sunshade (BiPVS) under hot summer and warm winter climate.

The bi-facial photovoltaic sunshade (BiPVS) is an innovative solution that utilizes vertically mounted bi-facial photovoltaic modules to provide shading. The BiPVS is capable of converting incident solar radiation into electricity on both the front and rear sides of the module, resulting in higher electrical efficiency compared to traditional mono-facial PV sunshades. The BiPVS has great potential as a sustainable solution for building shading and energy generation, which allows for improved indoor light/thermal environment and building energy efficiency. In this study, the bi-facial photovoltaic sunshade (BiPVS) was implemented in an office under typical hot summer and warm winter climate of Shenzhen, China. The energy performance of the BiPVS was analyzed using Energyplus. The comprehensive building energy saving was evaluated by comparing the energy consumption of the office with and without the BiPVS. Results showed that the total annual photovoltaic power generation was 133.19 kWh, while the comprehensive building energy savings were 159.65 kWh. Additionally, carbon dioxide emissions were reduced by 83.29 kgCO2 per year. The proposed method can help optimize the design parameters of BiPVS according to specific climate conditions, building types, and orientation, and contribute to the development of high-efficiency BIPV technology and support efforts towards carbon neutrality.