Table of Contents
ISRN Renewable Energy
Volume 2011, Article ID 439410, 6 pages
Research Article

Estimation of Diffuse Solar Radiation for Selected Cities in Nigeria

1Department of Electrical and Electronic Engineering, Ambrose Alli University, PMB 14, Ekpoma 310006, Nigeria
2Department of Electronic Engineering, University of Nigeria, Nsukka 410001, Nigeria

Received 10 July 2011; Accepted 9 August 2011

Academic Editors: E. R. Bandala, A. C. Rastogi, and P. Tsilingiris

Copyright © 2011 M. S. Okundamiya and A. N. Nzeako. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study proposes a multivariable model of monthly mean daily diffuse solar radiation on horizontal surfaces for three cities (Abuja, Benin City and Katsina), in Nigeria. The estimation was based on a correlation between clearance index and diffuse to global solar radiation ratio and was computed using monthly mean daily data set for global solar radiation on horizontal surfaces. The predictive efficiency of the proposed model was compared with the observed values and those believed to be universally applicable. The results suggest that the existing methods could be replaced by the developed model for a diffuse solar radiation data generation scheme.