Mahmood Hosseini - Islamic Azad University, Nour Branch, Nour
Hadi Salavati - Young Researchers & Elites Club, Islamic Azad University of Science and Research of Tehran
Naser Kordani - Young Researchers & Elites Club, Nour Branch, Islamic Azad University, Nour
Jalal Khaleghinia - Islamic Azad University, Nour Branch, Nour

The performance of a solar collector is affected by its orientation and its slope angle with the horizontal plane. In the present article, the optimum slope angle and theoptimum slope and azimuth angles of solar collectors are calculated utilizing Klein and Hay models in Mazandaran-Iran. The results showed that the energyreached to the collector oriented at optimum slope and azimuth angles increased about 31.28% comparing to the horizontal one utilizing KT model. This was about57.76% utilizing Hay models, respectively. Moreover, the results showed that the collector oriented at Hay optimum angles received significantly more energy

Solar Collector, Optimum Slope Angle,Optimum Azimuth Angle