Study on natural lighting and electrical performance of louvered photovoltaic windows in hot summer and cold winter areas

Abstract

Building integration with photovoltaics has received more and more attention in the development of green buildings. But traditional photovoltaic windows cannot make monthly adjustments to changes in solar altitude and weather. This paper proposes a new type of photovoltaic shutter system, the inclination angle and spacing of which can be adjusted according to the solar altitude angle and weather in different months. In order to better study the natural lighting quality and photoelectric conversion characteristics, this paper builds an experimental test platform for louvered photovoltaic windows. The final results of Illuminance of experiment and simulation are consistent. Furthermore, a new daylighting index is innovatively proposed, which compared to the general annual statistical indicators that are not precise enough. Combined with the typical weather in the area with hot summer and cold winter, the monthly angle and spacing regulation strategy is optimized. The research results show that compared with the change of the inclination angle, the change of the spacing makes the change of indoor lighting and electricity revenue more obvious. The months before and after June are the months with the lowest electric energy and the best indoor lighting quality of louvered photovoltaic windows. Its electricity revenue is between 9.18 and 22.46 kWh, and the proportion of indoor space that meets the 450–2000 lx illuminance range and the daylighting time exceeds 50% is about 85%. The months with higher electricity revenues are around March and October, with revenues ranging from 14.11 to 53.04 kWh.