مقايسه روش هاي مختلف پيش بيني تابش ديفيوز براي اقليم هاي ايران

Comparative Study of Various Methods of Estimation of the Solar Radiation Diffuse in Iranian Climates

Calculating the solar radiation (global, direct or diffuse) has many applications. The global solar radiation has already been measured in Iran, but the diffuse or direct solar radiation yet has to be measured. In this study, the global solar radiation was measured by IRIMO and direct solar radiation was predicted and the Maxwell method used to calculate the diffuse solar radiation. Results were then compared with many methods for predicating the diffuse solar radiation and the best method extracted was calculated. Finding showed that the Boland method was the best in Iranian cities to predict the solar radiation diffuse.