Modelization of Solar Radiation on Tilted Surface by Using Regression Analysis for Delhi, India

The main objective of this study is analysis of various models like Liu and Jordan, HDKR and Perez models and to establish a model for solar radiation on tilted surface by using regression analysis for a selected location, Delhi, India (27.89_N, 78.08_E) which lies in the Humid Subtropical and semi – arid with high variation between summer and winter. Global solar radiation is generally measured on a horizontal surface, whereas the maximum amount of incident solar radiation is measured on an inclined surface. Over the last decade, a number of models were proposed for predicting solar radiation on inclined surfaces. These models have various scopes; applicability to specific surfaces, the requirement for special measuring equipment, or limitations in scope. To find the most suitable model for a given location the hourly outputs predicted by available models are compared. In the present work, availability of solar radiation for south-facing flat surfaces in the Humid Subtropical Climatic Region of India has been estimated.