Abstract:

Vehicle integrated photovoltaic(VIPV) can effectively reduce the dependence of vehicles on fossil fuels, help to reduce carbon dioxide emissions, and it is an important measure to promote the development of sustainable transportation. The irradiance of the whole vehicle was analyzed, and the annual cumulative radiation of the vehicle was calculated for evaluating the solar energy resources of the whole vehicle and optimizing the design of the integrated photovoltaic system on the vehicle. Based on the triangular mesh surface model, the global horizontal irradiance of a static vehicle at a specific time and position was calculated according to Kasten Clear Sky model, and then the direct normal irradiance on the inclined surface was analyzed by using the ray-casting algorithm in 3D space, and the diffuse irradiance was calculated combined with Perez model. Finally, the global irradiance on each triangular mesh and the irradiance distribution of the whole vehicle was obtained. The radiation energy of the vehicle in different regions and different driving conditions was also calculated and analyzed, providing a reference for the fine design of the vehicle efficient photovoltaic system. The result shows that the irradiance of different parts of the car is greatly different, the cumulative radiation energy throughout the year of the hood, the roof, the front and rear windshields, the left and right sides of the car and the windows varies from 15.8% to 42.5%, and the average radiation energy of the car is about 75% of the horizontal plane, and the difference of radiation energy is not more than 5% when the car is in different orientations.

Key words: vehicle integrated photovoltaic, solar radiation, ray casting, triangle mesh model