Experimental Comparison of Different Global Irradiation Models with and without Sun Tracking for the South of Spai

Abstract

It is very unusual to have global irradiance data for a tilted surface and even more for a surface with a perfect sun tracking. The most common available data is the global horizontal irradiance, thus it is necessary to convert the available data into the desirable inclination. The purpose of this paper is to analyse the different response of the radiation models that are used to calculate the global irradiance in static surfaces and in surfaces with a perfect sun tracking (two axis). For that end 10 years of measured data has been utilized. The combination of methods that better approaches to the experimental values is the one formed by Orgill - Hollands and Perez for stationary surfaces and mode- Temps-Coulson for two-axis tracking.