An assessment of a revised Olmo et al. model to predict solar global radiation on a tilted surface at Beer Sheva, Israel

摘要: Abstract A model to convert horizontal solar global radiation that on a tilted surface is presented. It based upon relatively simple proposed by [Olmo FJ, Vida J, Foyo I, Castro-Diez Y, Alados-Arboledas L. Prediction of irradiance inclined surfaces from irradiance. Energy 24 (1999) 689–704]., which requires only measurements but was found produce significant errors when tested with data another site. The present assumes the availability databases for at least two three types, viz., global, beam and diffuse. converted applying Olmo diffuse component, whereas component using geometrical relationship between surfaces. original anisotropic correction factor now assumed be function sky conditions. were subsets corresponding clear, partially cloudy clearness index values. factors determined fitting 12-months database. then it second database consisting 24-months not involved in development. give better results than highly regarded more complex models.