Numerical Analysis of the Spread of Solar Radiation Flux across Multiple Walls for a Living Area in Adrar Region

This study aimed to determine the amount of solar radiation flux incident on the walls of a simple residential house located in an arid desert area. To this end, a preliminary model of the sun’s path throughout the whole day was made. A numerical code in the FORTRAN language was also developed. This code is based on numerical models to calculate all the astronomical quantities necessary to determine the values of the solar radiation flux mentioned above. After comparing and analyzing of the results obtained from this numerical code, it was found that the percentage of agreement between the calculated values and the values measured by the Renewable Energy Research Unit in Saharan Medium (URERMS) is very satisfactory. The error rate does not exceed 4% for the average outdoor temperature and the average global solar radiation flux for the selected typical day.