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Abstract
In the present article, the optimum tilt and azimuth angles have been calculated utilizing non-isotropic Klein and Hay methods in Isfahan. This is to obtain the maximum monthly total solar energy during a year. In the first part, the optimum tilt angle of the panel with zero azimuth angle is obtained using the isotropic Liu model. The results showed that the yearly optimum slope angle is near the latitude angle of the region. Comparison between the total solar energy of a tilted panel at an optimum angle and a horizontal panel show that the tilted panel receives significantly more energy during the year. In the second part, the effects of an azimuth angle are considered using non-isotropic models. The results also show that the panel of optimum tilt and azimuth angles receives higher solar energy compared with the fixed panel. Finally, the results depict that the effect of setting the panel at the optimum angles is more significant in summer and winter compared to other seasons.