Estimation and comparison of solar radiation intensity by some modeles in a region of Iran

       The 6th Asia-Pacific Power and Energy Engineering Conference (APPEEC 2014)——Due to the increasing expantion of new energy application on a world scale and because of the reduction of invironmental pollution arise from usage of solar energy in reigns which have the high potential of solar energy, the necessity of measurment of solar radiation in different regions of Iran is obvious. Therefore, in this study, the amount of radiation is measured by Pyranometer from begining of February to Agust 2010 in Semnan(The central part of Iran), and it is compared with daily sunny hours, different estimated models of daily radiation such as Angstrom-Pryskat (Montis, Climate classification based on the Terwartha scientific map , using the results of 40 world wide station, using the results of 9 Synoptic station in Iran), the maximum likelyhood (using the results of 100 stations in world wide, using the results of 9 Synoptic station in Iran). Finally Terwartha scientific map model is proposed because of more match with measured data on location.