Abstract
The monthly frequency distribution of solar irradiance has now become a common meteorological input for solar energy system sizing methods, either directly or through the concept of “Utilizability”. Cumulative Frequency Curves (CFC) of solar irradiance were investigated within the frame of the European Solar Energy R and D Programme (Project F). The aim of this study was to prepare a European data set of CFC's for various typical climates and tilted planes. An algorithm for computing global irradiance on tilted planes has been validated, using 3 years of measured data on inclined planes at Carpentras. CFC's of global irradiance for 6 tilt angles at 12 European locations have been derived, using this algorithm and the “Test Reference Years” (TRY) hourly meteorological data base. CFC's are presented for each month in the form of parameters of an orthogonal polynomial fitting. La distribution statistique mensuelle de l'eclairement solaire est devenue aujourd'huiune entree meteorologique c1assique pour les me...
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