Prediction of solar global radiation on a surface tilted to the south
2008
Solar global and diffuse radiation intensities are, in general, measured on horizontal surfaces, whereas stationary solar
conversion systems (both flat plate solar collector and PV) are tilted towards the sun in order to maximize the amount of
solar radiation incident on the collector surface. Consequently, the solar radiation incident on a surface tilted to the south
(northern hemisphere) must be determined by converting the solar radiation intensities measured on a horizontal surface
to that incident on the tilted surface of interest. There exist a large number of models designed to perform such a
conversion. Eleven such models have been tested utilizing data measured in Beer Sheva, Israel. The data consist of
hourly solar global and diffuse radiation on a horizontal surface, normal incidence beam and global radiation on a south-oriented
surface tilted at 40°. The individual model performance is assessed by an inter-comparison between the
calculated and measured solar global radiation on the south-oriented surface tilted at 40° using both graphical and
statistical methods. The relative performance of the different models under different sky conditions, i.e., clear, partially
cloudy and cloudy as defined by the hourly clearness index value, has been studied.
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