Srivastava, S. K.; Singh, O. P.; Pandey, G. N. - In: Applied Energy 52 (1995) 1, pp. 55-64
Empirical correlations for estimating the ratios of monthly mean hourly to daily global solar radiation received on horizontal surfaces have been compared and their validities tested. The correlation of Collares-Pereira and Rabl [Solar Energy, 22, (1979) 155] yields the best results, while the...