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Models available in literature to calculate the global radiation on an inclined surface are similar except for the diffuse radiation component. Among these approaches the simplification of the distribution of diffuse radiation in the atmosphere to be isotropic is the simplest and has a minor effect on the accuracy of prediction of the global radiation. because the diffuse radiation contributes 20% of global radiation in clear skies. A computer programmed is constructed on mathematical formulation to find the hourly, daily and monthly average values of optimum tilt angle, optimum orientation and maximum total radiation on the tilted surface of the collector. The daily and monthly average values of optimum tilt angle are calculated, so that the average values of the maximum total radiation will be near to its hourly values. The following results have been drawn : 1. The optimum slope is found to depend on Several parameters, namely ) W , A Z, C, , , n, , f( = p i opt ρ γ φ β the first three of these parameters are the most

international conference on aerospace sciences and aviation technology

MATHEMATICAL MODEL &amp; COMPUTER PROGRAM DEVELOPED FOR CALCULATING THE TOTAL RADIATION ON SLOPED SOLAR SURFACE COLLECTORS BASED ON OPTIMUM TILT ANGLE IN AMMAN, JORDAN