Solar radiation estimation from geostationary satellite images is accepted by the international scientific community, especially where no previous ground radiometric measurements are available. The most accepted methodology is Heliosat. In this work, a combination of the existing methods Heliosat-1 and Heliosat-2 has been implemented for this purpose, and the obtained results are presented. To analyze the results provided by the implemented methodology a validation against measurements has been made. Firstly, solar Global Horizontal Irradiance (GHI) has been estimated from satellite images using data of the Meteosat Second Generation (MSG) satellite corresponding to the period from 2009 to 2011. Secondly, measurements recorded during the same period of time at the Cener station which belongs to the Baseline Surface Radiation Network (BSRN) have been obtained. Both estimated and measured data have been integrated into hourly values for the validation process. The obtained values for Cener BSRN station are a MBE of 2% and a RMSE of 113 W/m2, which are smaller than the recommended values for hourly GHI data (MBE smaller than 5% and RMSE smaller than 160 W/m2). During the months of summer the errors in terms of W/m2 are bigger than during the months of winter. However, since the irradiance is higher during the months of summer, the errors are smaller in terms of % during the months of summer. Although the methodology can be applied to locations where no ground measurements are available, it is preferable to analyze locations with available measured data.
A Combination of Heliosat-1 and Heliosat-2 Methods for Deriving Solar Radiation from Satellite Images
2014
7 Seiten, 8 Quellen
Aufsatz (Konferenz)
Englisch
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