Design optimization and experimental evaluation of photovoltaic double skin facade

Abstract

This study proposed the introduction of a photovoltaic double skin façade (PV-DSF) as a way to economically and easily improve the performance of building envelopes. This system has been designed to be installed not only in new buildings but also in remodeling or renovation projects of existing buildings even in a state where occupants are present inside. For the PV-DSF system suggested, this study aimed to perform experimental evaluation of 1) the optimal operation method to maximize electric energy production of the PV vent window and to reduce the heating and cooling energy consumption of buildings and 2) the thermal behavior and energy performance of the building when the proposed PV-DSF is applied.Analysis results using simulation have shown that the monthly optimal operating angles of the PV vent window to minimize heating and cooling energy demand were the same as the operating angles to maximize power generation. It has also been proven through experiments that the proper operation of the PV vent window can significantly reduce the energy demand of buildings. In particular, the difference between the DSF and outdoor temperatures was 12 °C in winter, showing that it is possible to achieve a significant reduction of heating energy demand. Lastly, when the PV-DSF was applied, air and wall temperatures were decreased by 0.5 °C and 2 °C in summer, respectively, and cooling energy consumption was also at least 10% reduced on average.