Abstract
The aim of this work has been to obtain a typical annual time a function by the application of a calculation procedure based on a Fourier analysis to global solar radiation data of nine years at Helwan Egypt from June 1991 to August 1999. This function allows us to estimate the most probable values of the horizontal daily global solar radiation for every day of the year at Helwan Egypt. It is confirmed that the harmonic model presents an important percentage with 98% confidence bounds. The applied method permits its application to the new measurements of solar radiation that are being carried out, This will be necessary because of the number of years used in this study.
Highlights
The Solar radiation data needed for effective research into solar energy utilization
This work tried to describe the state of global solar radiation in Helwan, Egypt and, to assess the relative effectiveness of true noon instantaneous irradiance observations at this site in terms of modeling long-term
To investigate the suite of empirical models used in the estimation of the global solar radiation at Helwan, Egypt
Summary
The Solar radiation data needed for effective research into solar energy utilization. The parameters, which govern a physical model of the sky, take; hour-by-hour or day by day, values which fluctuate according to the fluctuating changes in the meteorological and environmental situations. These parameters include the sunshine hours, the relative humidity, cloud cover, temperature, and water vapor pressure. This work tried to describe the state of global solar radiation in Helwan, Egypt and, to assess the relative effectiveness of true noon instantaneous irradiance observations at this site in terms of modeling long-term. To investigate the suite of empirical models used in the estimation of the global solar radiation at Helwan, Egypt
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