Converting Daily Solar Radiation Tabulated Data with Different Sky Conditions into Analytical Expression using Fourier Series Technique

This paper presents a method to convert the Meteorological tabulated data into an analytical expression in which it can be used in engineering application. The paper uses a Fourier series technique to convert the solar radiation variation during the day for clear days and for a beclouded intermittent days to predict an analytical expression for solar radiation at any time of that day by finding the weights for both (an & bn) parameters for Fourier series upto (n =10). It is found an encouraged result that will help the researchers to use Fourier series to convert any tabulated data into an analytical expression which gives a useful indication for using such method in solar applications. The results which are drawn in the plots for (n upto 10) showing the accuracy in coincidence of this series increases for the given function as the (n terms) increases from (n = 0 to n =10), for more precision the weights for both (an & bn) parameters (n more than 10) should be found.