Optimization of Photovoltaic Integrated Shading Devices

Abstract

This study investigated methods of optimizing the operation of photovoltaic (PV) integrated shading devices to attain their maximum benefits to indoor spaces and occupants. A shading device consisting of multiple adjustable louvers coated with PV cells was examined. A motor adjusted the blind angle of the louvers. Sensors measured the available sunlight and daylight levels. The operation of the motor was controlled by a computer based on measured climatic conditions. In developing optimal operation methods, fire energy, thermal, lighting, and visual factors were considered: shading effect, energy production from the PV cells, indoor daylight levels, visual comfort, and thermal comfort. In our control methods, visual comfort supersedes any other physical factors. This is based on the fact that visual comfort is the most important factor in office environments. Thus, it was regarded as the first-order factor in the PV integrated shading control. The performance of a PV integrated louver-type shading device was examined in terms of energy production, light transmission, and visual comfort.