文档介绍：Solar aspects of papers
Computation of Monthly Mean Hourly Global Solar
Radiation from Daily Total
S. Alam*, S. N. Garg** and S. C. Kaushik**
*University Polytechnic, Jamia Millia Islamia University, Jamia Nagar
**Centre for Energy Studies, Indian Institute of Technology, Hauz Khas
New Delhi 110016, India
Email: shah_******@
(Received on 28 May 2006, revised on 25 Feb 2007)
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Abstract
New quadratic equations between global solar radiation fraction and day length have been developed for Indian region in this paper. Measured data over a period of 19 years, 1960–1978, for the four stations, namely New Delhi, Mumbai, Kolkata and Chennai and Gopinathan-Soler approach, have been used in this analysis. The developed correlations are tested for two new stations, Jaipur and Pune, whose recent solar radiation data, 1995 – 2002, is available. The values, computed by present model pared with puted by Liu and Jordan model and by Collares-Pereira and Rabl model, in term of statistical error estimators, like root mean square error (RMSE), mean bias error (MBE), and mean absolute percentage error (MAPE). It is found that for large hour angles from solar noon (HFSN), and , Liu and Jordan model shows 20% - 50% RMSEs, Collares-Pereira and Rabl model, 10% - 20%, while the present m