Estimation of global and diffuse solar radiation for Nawabshah, Sindh, Pakistan

The study of solar irradiation has been carried out for the first time over Nawabshah,Sindh,Pakistan. In this study, twenty-two years (1983–2005) of measured data of bright sunshine hours in this region have been used to estimate global and diffuse solar radiation. Regression coefficients a and b have been calculated for the first order Angstrom type correlation for the city using relationship given by Tiwari and Sangeeta. The results obtained via four empirical models (Angstrom 1924, Liu & Jordon 1960, Page 1977, Hawas & Muneer 1980) were compared with values obtained from NASA Satellite-based data (Global, diffuse). A good agreement was found between both models. The global irradiation possesses larger value for the months (April –July), for the period of study.