Comparison Of Diffuse Solar Radiation Models Using Data For Onne, Nigeria

Abstract

Measurements of global solar radiation and sunshine duration data during the period from 1984 to 1999 were supplied by IITA (International Institute of Tropical Agriculture) at Onne. The data were used to establish empirical relationships that would connect the daily monthly average diffuse irradiation with both relative sunshine duration and clearness index separately and in combination. The estimated results were then compared with measured values of a nearby location since measured data on diffuse radiation for this location is not available. The correlation connecting diffuse radiation with percentage possible sunshine is found to be applicable over Onne.

Keywords: Diffuse, solar radiation, Onne.

Global Journal or Pure and Applied Sciences Vol. 14 (4) 2008: pp. 473-476