Abstract
Accurate knowledge about solar radiation in a region is of indispensible significance for sizing, designing and monitoring solar energy systems. In case of inaccessibility to measure solar data, proper solar radiation models may be used. This study aims to present the closeness or the relationship between the predicted and measured values of global horizontal irradiance and direct normal solar irradiance in a solar monitoring station located in National Institute of Technology (NIT), Tiruchirappalli. The measured data is promoted under Indo-German Energy programme by the Ministry of New and Renewable Energy, Centre for wind energy technology and federal of German government named GIZ. The data were monitored for the duration of five months from August 2013 to December 2013. The validation is brought out by the significance of the regression coefficient, which approaches to unity declaring the fitness of the model resulting in proposing regression models for the considered region. A statistical approach is also carried out for the validation by the evaluation of mean bias error (MBE) and the root mean square error (RMSE) from the predicted and the model values. Thus the proposed models lead to theoretical assessment of global horizontal irradiance and direct normal irradiance for a particular location.
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