Abstract
A test of the validity of applying the isotropic model in simulating the global radiation incident on an inclined surface in Beer Sheva, Israel has been performed. The average hourly global radiation incident on a surface tilted to the south at 40° has been simulated by means of the isotropic model, utilizing measured normal incidence beam and horizontal global radiation values. The simulated values were then compared to the corresponding measured global radiation values for the tilted surface. The analysis has been based upon seasonal average hourly as opposed to monthly average hourly values in order to broaden the available solar radiation database. The isotropic model was able to simulate the winter, spring and summer average hourly values with less than a 10% RMSE between 10:00 - 14:00 and the autumn values with approximately a 12% RMSE.
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