Building Simulation

, Volume 6, Issue 4, pp 379–383 | Cite as

A simple model for the derivation of illuminance values from global solar radiation data

  • Sokol Dervishi
  • Ardeshir Mahdavi
Research Article Building Thermal, Lighting, and Acoustics Modeling


This paper presents a new simple luminous efficacy model for global horizontal irradiance. The objective is to derive values of outdoor global horizontal illuminance data from typical local weather station data including global horizontal irradiance and Humidity Ratio of outdoor air. The proposed luminous efficacy model incorporates, as the main influencing variable, the Clearness Factor, which is an original derivative from the Clearness Index. Two further variables are included in the model formulation. These are the Humidity Ratio and the solar altitude. Moreover, the model includes a location-dependent variable, which may be derived from the latitude information. The paper includes the result of the statistical analysis of the relationship between the model predictions and the measured data. The results of this analysis display a good agreement between predictions and measurements.


daylight irradiance illuminance luminous efficacy simulation 


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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Department of Building Physics and Building EcologyVienna University of TechnologyViennaAustria
  2. 2.Department of ArchitectureEpoka UniversityTiranaAlbania

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