Predicted and measured global solar radiation in Egypt

Evaluation of sunshine duration from cloud data in Egypt

“…The MPE values of the deduced formulae (1)-(3) were ranged from À0.5465% to +0.6298%, from À0.6144% to +0.6823% and from À0.6240% to +0.8069%, respectively. All values of the statistical tests, MBE and RMSE, for the three deduced formulae (1)- (3) have been found very close to zero. It could be concluded that Egypt's formula (3) gives precise estimations for n/N and is recommended for use at any location in Egypt.…”

“…Some works used sunshine duration [2][3]5,[7][8][9]15,24], others used mean daytime cloud cover or relative humidity and maximum and minimum temperature [11,16,18], while still others used the number of rainy days, sunshine hours and a factor that depends on latitude and altitude [6]. Most of the models for estimating solar radiation that appear in the literature use sunshine duration.…”

“…1 and Table 1). Therefore, many empirical models have been proposed to estimate the solar radiation in Egypt using sunshine duration [3,[26][27][28][29][30][31]. In Egypt, sunshine data are obtained from the Campbell-Stokes recorder.…”

Correlation of global solar radiation with meteorological parameters over Egypt

“…The solar radiation data are not easily available for many countries. Many countries cannot aord the measuring equipment and techniques involved [1]. Therefore, it is rather important to develop methods to estimate the solar radiation using whatever weather parameters are available.…”

Sunshine and global solar radiation estimation at different sites in Egypt

“…Information on global solar radiation received at any sites (preferably gained over a long period) should be useful not only to the locality where the radiation data is collected but also for the wider world community (Massaquoi, 1988). A global study of the world distribution of global solar radiation requires knowledge of the radiation data in various countries and for the purpose of world wide marketing, the designers and manufactures of solar equipment will need to know the average of global solar radiation available in different and specific regions (Ibrahim, 1985). Obviously, measured data is the best form of this knowledge.…”