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K. Orehounig, S. Dervishi, A. Mahdavi:
"Comparison of Computed and Measured Irradiance on Building Surfaces";
Talk: Building Simulation 2011 - IBPSA 2011, Sydney, Australien; 2011-11-14 - 2011-11-16; in: "driving better design through simulation - Proceedings of the 12th Conference of The International Building Performance Simulation Association", V. Soebarto, H. Bennetts, P. Bannister, P.C. Thomas, D. Leach (ed.); Konferenzpublikation mit wissenschaftlichem Lektorat, (2011), ISBN: 978-0-646-56510-1; 757 - 764.

To simulate buildings' energy use or gains from
building-integrated solar energy systems, information
is required regarding solar irradiance on building
surfaces. Since measurement databases typically
include only horizontal irradiance values, radiation
intensity on inclined surfaces must be calculated. The
performance of models proposed for this purpose
must be evaluated against measurements. Toward
this end, this paper considers six options to derive,
from horizontal irradiance data, radiation intensity on
vertical surfaces. To evaluate these options,
simulated vertical irradiance values were compared
with respective measurements obtained in Vienna,
Austria. The range of errors was found to be rather
high for all options.

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