Comparative Study on Accuracy of Several Diffuse Radiation Models

Abstract:

Based on an analysis of the existing diffuse radiation models in combination with the measured solar radiation data in Shanghai, a new anisotropic diffuse radiation model was established. Then, its accuracy was compared with the existing models in terms of the weather type, orientation, season and inclination. Research on weather types shows that for cloudy and partially cloudy days, Klucher model, Hay model and Skartveit & Olseth model are more consistent with the measured values, but for clear days, Perez model and new anisotropic diffuse radiation (NADR) model are better. Research on orientation shows that for the east and the north, Perez model and NADR model are more accurate, but for the south and the west, Liu & Jordan model and NADR model are better. Research on season shows that for summer and autumn, Perez model and NADR model are more accurate, but for autumn and winter, Liu & Jordan model and NADR model are better. Research on inclination shows that Klucher model is more consistent with the measured values. All kinds of diffuse radiation models in calculation diffuse radiation of small angle of inclination are better than the large angle of inclination. A comprehensive consideration of weather type, orientation, season, inclination and son on shows that the Temps & Coulson model and Gueymard model are of a lower accuracy, while NADR model is of the highest accuracy of all.