Characteristics of the monthly averaged hourly diffuse irradiance at Lagos and Zaria, Nigeria

A.A.L. Maduekwe and B. Garba

Renewable Energy, 1999, vol. 17, issue 2, 213-225

Abstract: An extensive study of characteristics of the monthly averaged hourly diffuse radiation has been carried out for the southern and coastal city of Lagos, latitude 6.58°N, and at Zaria, latitude 11.10°N, a northern city situated in the savannah belt. Correlations have been established for the prediction of the monthly averaged hourly diffuse fraction of the total irradiance reaching these locations. The inclusion of the solar elevation as an explanatory variable in the usual K-Kt correlation improved the correlation for Zaria using the root mean square error as a measure by 31.6%, while the correlation for Lagos was not improved by the inclusion of the solar elevation as a predictor. Comparison with five models from higher latitudes indicate that their use for the prediction of the diffuse solar irradiance at Nigerian locations will not give correct results. © 1999 Elsevier Science Ltd. All rights reserved.

Date: 1999
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:17:y:1999:i:2:p:213-225

DOI: 10.1016/S0960-1481(98)00034-2

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