Correlations for Estimation of Solar Radiation on Horizontal Surfaces
Publication: Journal of Energy Engineering
Volume 134, Issue 4
Abstract
In this study, variation of the solar radiation over horizontal surfaces for clear-sky atmospheres was predicted and compared with measurements carried out in Erzurum, Turkey (latitude: 39.55, longitude: 41.16, and altitude: ). Hottel’s clear-sky model was used in calculations of solar radiation on horizontal surfaces for clear-sky atmospheres. The results show that the model calculations are reasonably consistent with the measured data. It is recommended that Hottel’s clear-sky model can be used for solar radiation calculations in Erzurum. Also, correlation equations giving monthly averages of clear-sky and global solar radiation on horizontal surfaces have been developed. In order to indicate the performance of the correlation equations, the relative percentage error, correlation coefficient, mean percentage error, mean bias error, and root-mean-square-error methods were used.
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Acknowledgments
The writer thanks the Turkish State Meteorological Service for providing Erzurum meteorological data and the Atatürk University Research Fund for providing support for the solarimeter and its equipment.
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© 2008 ASCE.
History
Received: Apr 16, 2007
Accepted: Aug 27, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
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