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Ass. Lect. Maha Abd Elsalam Mohamed Attallah :: Publications:

Prediction of the daily global solar irradiance received on a horizontal surface -New approach
Authors: MK El-Adawi, SA Shalaby, SESA El-Ghany, FE Salman, MA Attallah
Year: 2015
Keywords: Prediction of solar irradiance ,Daily global solar radiation, Solar distribution function for clear days,Computation on theoretical basis of qmax
Journal: International Refereed of Engineering and Science
Volume: 4
Issue: 6
Pages: 85-93
Local/International: International
Paper Link:
Full paper Not Available
Supplementary materials Not Available

A general distribution function q (t) W/m2for clear days is suggested to predict the global solar irradiance incident on a horizontal surface as a function of the local day time and the maximum daily value of the incident solar irradiance qmax. Moreover, the authors suggested a form to express qmaxin terms of the solar constant. The value of the solar constant is also adjusted to its variation with the distance between earth and the sun. This is done to get a complete theoretical expression for q (t) rather than semi- empirical formulae introduced in previous trials. Comparison between the computed values according to the introduced theoretical formula of q (t) and the corresponding published experimental data recorded in Barcelona(Spain) , Hong Kong (China), Cairo(Egypt), Makkah ,Jeddah(Saudi Arabia) is made.Good fitting is obtained except for few extreme points.

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