Estimation of solar radiation from the number of sunshine hours

David B. Ampratwum and Atsu S. S. Dorvlo

Applied Energy, 1999, vol. 63, issue 3, 167 pages

Abstract: Several expressions have been used to estimate global solar radiation from sunshine hours for weather stations in Oman, an arid region. These included original (linear) and modified (linear-logarithmic) Angström-Black type regression functions, a quadratic function, a power relationship, a power-trigonometric equation and one from a new Angström-Black type logarithmic model. For the power-trigonometric model, the solar altitude of the station was used as additional information for estimating the solar radiation. All the models performed well as estimators of global solar-radiation from sunshine hours but the non-linear models were better than the basic linear model. The power-trigonometric model estimated the radiation values best. The quadratic and linear-logarithmic models are the preferred models when only the relative sunshine is used.

Date: 1999
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