Estimation of solar radiation on the tilted surfaces in Songkhla, Thailand

This work presents a method to estimate the average yearly solar radiation on tilted surfaces. In addition, calculation of the monthly average daily diffuse fraction correlation by using the monthly average daily solar radiation on horizontal surface of satellite data, and review of the monthly average daily diffuse solar radiation on horizontal surface of R. H. B. EXELL are presented. The proposed method is compared to the cases of Serm Janjai, Page, and Liu and Jordan. The estimation of an average yearly solar radiation consists of a zero azimuth surface and non-zero azimuth surface.