Prediction Of Clearness Index For Some Nigerian Stations Using Temperature Data

Abstract

Global solar radiation and mean temperature data for five Nigeria stations have been used to fit the Angstrom model for the clearness index (KT =H/Ho), the mean temperature (Tmean) and maximum temperature (Tmax). The tests of performance of the model for the five stations have been done in terms of the widely used statistical indicators, Mean Bias Error (MBE) and Root Mean Square Error (RMSE). It was found from statistical model performance indicators that the models provided reasonably high degree of precision in the prediction of average monthly global solar radiation on horizontal surfaces.