Publications in Scientific Journals:

A. Mahdavi, S. Dervishi:
"A comparison of luminous efficacy models based on data from Vienna, Austria";
Building Simulation, 4 (2011), 4; 183 - 188.

English abstract:
To support building design in view of daylight quality, computational (simulation) tools can
provide effective support. To perform detailed daylight analysis via simulation, appropriate sky
models are needed. In the past, various sky luminance distribution models have been developed.
Such models, however, require illuminance data for the relevant location. As measured external
illuminance levels are not available for many locations, the more widely available irradiance
measurements can be translated, using proper luminance efficacy functions, into illuminance
values. The present paper compares five global luminous efficacy models based on a database of
measured illuminance and irradiance data from Vienna, Austria. These models typically involve
mathematical formulations with multiple coefficients, whose values are derived for a specific
location. The results suggest that these models performed rather poorly, once tested against Vienna
data. However, the models' performance improved significantly, once the respective coefficients
were modified (calibrated) using the Viennese database.

German abstract:
siehe englischen abstract

daylight, illuminance, irradiance, global luminous efficacy, simulation

"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)

Created from the Publication Database of the Vienna University of Technology.