Direct Normal Irradiance for CSP Based on Satellite Images of Meteosat Second Generation
2009
We present a method to derive the direct normal irradiance (DNI) from MSG data. For this, we apply the Heliosat method and a new model for the direct fraction of the irradiance. The clear sky irradiance is mainly determined by the aerosol optical depth (AOD) and water vapour content, which are taken from suitable climatologies. The accuracy of satellite derived DNI data has been analyzed for Spanish sites, more sites will be evaluated within the project SESK (Standardisierung der Ertragsprognose Solarthermischer Kraftwerke – standardization of yield prognosis for solar thermal power plants). As for concentrating solar power (CSP) the frequency distribution of DNI is of special importance, special attention is given to correct modeling of this feature.

Combining Solar Irradiance Measurements and Various Satellite-Derived Products to a Site-Specific Best Estimate
July 2008
Combining Solar Irradiance Measurements and Various Satellite-Derived Products to a Site-Specific Best Estimate', Proceedings of the 14th biennial SolarPACES Symposium, Las Vegas, NE (USA), 04.03.-07.03.2008

Evaluation of a new model to calculate direct normal irradiance based on satellite images of Meteosat Second Generation
2008
We present a method to derive the direct normal irradiance DNI from MSG data. For this we apply the Heliosat method to extract cloudiness from the satellite images. Clouds are causing high fluctuations in the DNI. A new model for the direct fraction of the irradiance is introduced to calculate DNI. The clear sky irradiance is mainly determined by the aerosol optical depth (AOD) and water vapour content, which are taken from suitable climatologies. The accuracy of satellite derived DNI data is analyzed here for Spanish sites.