Mohammed, Hayder NooriMengüç, Mustafa Pınar2019-01-252019-01-2520181742-8297http://hdl.handle.net/10679/6122https://doi.org/10.1504/IJEX.2018.091560The present study is conducted with two primary objectives: First, a new formulation for the maximum efficiency of the solar radiation conversion is developed by considering the radiative energy transfer between two surfaces at different temperatures for a constant volume system. Second, a new methodology is introduced for estimating the exergy value of the monthly average daily horizontal global radiation, including many parameters, such as monthly average daily value of the horizontal extraterrestrial radiation, the number of sunny hours, the day length, the mean temperature and the mean wind velocity. Seven statistical parameters are used to validate the accuracy of all models. The results of the two new models are found to be more reliable than the results obtained from other models. This study, which was conducted for four locations in Iraq and Turkey. The findings would help in predicting the maximum availability of solar radiation based on weather parameters.enginfo:eu-repo/semantics/restrictedAccessArticle25436438500043413270000610.1504/IJEX.2018.091560Solar radiationSolar radiation exergyEmpirical models2-s2.0-85047199523