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E.M. Vazifeh, S. Dervishi, A. Mahdavi:
"Calculation models for the diffuse fraction of global solar radiation";
Talk: CESBP - 2nd Central European Symposium on Building Physics, Wien, Österreich; 2013-09-09 - 2013-09-11; in: "Proceedings of the 2nd Central European Symposium on Building Physics 9-11 September 2013, Vienna, Austria", A. Mahdavi, B. Martens (ed.); ÖKK-Editions, 1 (2013), ISBN: 978-3-85437-321-6; 587 - 590.

Data on the magnitudes of diffuse and direct solar radiation data is needed for a number of engineering applications. For example, configuration and sizing of solar energy systems require reliable solar radiation data. Measured data of global and diffuse irradiance on horizontal surface or direct normal irradiance are available only for a limited number of locations. However, most weather stations provide global irradiance data. Hence, numerous models have been proposed to derive the diffuse fraction of the global solar radiation. This paper compares the performance of six diffuse fraction models for derivation of horizontal diffuse irradiance based on the more widely available global horizontal irradiance data. Data from our Department's micro-climatic monitoring station (Vienna, Austria) was used for the model comparison purposes. The results suggest that none of the models provide acceptable predictive performance.

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