Evaluation of 12 models to estimate hourly diffuse irradiation on inclined surfaces
Renewable Energy, Jun 30, 2008
This study evaluates the performance of 12 models to estimate hourly diffuse solar irradiation on... more This study evaluates the performance of 12 models to estimate hourly diffuse solar irradiation on inclined surfaces from those measured on horizontal surfaces. Total solar irradiation incident on a tilted surface consists of three components including: beam, diffuse and reflected from the ground. On a semi-hourly basis, the beam component can be calculated by the ratio of the incidence angle to the solar zenith angle. The reflected component has a small effect on calculations and may be calculated with an isotropic ...
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