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Comparative Studies of Measured and Estimated Values of Global Solar Radiation using a Constructed Reliable Model Pyranometer and Angstrım-Prescott Model at Bauchi, Nigeria

Burari, F.W., Abdul’Azeez, M. A. and Medugu, D. W.

In this study, Angstrım – Prescott model was utilized for estimation of global solar radiation for Bauchi, Nigeria from sunshine hours. The estimated results obtained for twelve months, starting from 1st November, 2008 to 31st October, 2009 were compared to measured values obtained with a constructed reliable model pyranometer. The measurements were obtained within the same period.The values of the global solar radiation estimated and measured were tested using Mean Bias Error (MBE), Root Mean Square Error (RMSE), and the t-statistics. Average RMSE and MBE for comparison between measured and estimated global solar radiation were 43.60Wm-2 and 12.59Wm-2 , respectively. The t-statistics was used as the best indicator; this indicator depends on both, and is more effective in determining the model’s performance. The agreements between the estimated and measured data were remarkable.