Correlation for Diffuse Radiation from Global Solar Radiation and Sunshine Data at Beijing, China
Publication: Journal of Energy Engineering
Volume 135, Issue 4
Abstract
Solar radiation data are essential for the work of energy planners, engineers, and agricultural scientists. However, most solar radiation recording stations measure only global radiation in China. It is, therefore, necessary to elaborate correlations between the rarely available diffuse radiation and other climatic data. In the present study, 10-year data (1995–2004) of daily global diffuse solar radiation and sunshine duration obtained at Beijing meteorological station of China was analyzed to guide future projects. Nine models correlating the diffuse fraction with both the clearness index and percentage possible sunshine and each variable separately were tested. The accuracy of the correlations is performed in terms of the two widely used statistical indicators, mean bias error, and root mean square error. The results indicate that the correlations relating with both and are more reliable than using each variable separately and Model 9 is preferred for its accuracy. The recorded data of Zhengzhou meteorological station are compared with the corresponding values predicted by Model 9 of Beijing. Model 9 provides predictions very close to the measured values of Zhengzhou. Therefore, it may be concluded that Model 9 can be used for estimating diffuse solar radiation for locations of semiwet region of the north of China where only global solar radiation and sunshine duration are available.
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Acknowledgments
This work was financially supported by the Doctoral Foundation of Xi’an Jiaotong University.
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Information & Authors
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Published In
Journal of Energy Engineering
Volume 135 • Issue 4 • December 2009
Pages: 107 - 111
Copyright
© 2009 ASCE.
History
Received: Jun 5, 2007
Accepted: Dec 9, 2008
Published online: Nov 13, 2009
Published in print: Dec 2009
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