Evaluation of simplified procedure for indoor daylight illuminance determination against data in scale model measurements

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)213-223
Journal / PublicationIndoor and Built Environment
Issue number3
Publication statusPublished - Jun 2006


An accurate estimation of the amount of daylight entering a building is the key step in evaluating daylighting designs. The concept of the daylight coefficient (DC), which considers changes in the luminance of the sky elements, offers an effective way of computing indoor daylight illuminances under various sky conditions and solar positions. We currently propose a numerical procedure in the form of nomograph to compute the interior daylight illuminance using the DC concept. This paper presents the work to validate this method via scale model measurements under different actual sky patterns. It was shown that daylight illuminances calculated by the proposed method were in reasonably good agreement with measured results. The findings will hopefully provide building professionals and students with a reliable and simple alternative to current practices that incorporate sky luminance variations to predict the indoor daylight illuminance and assess visual performance under various real sky conditions. © 2006 SAGE Publications.

Research Area(s)

  • CIE standard skies, Daylight coefficient, Daylight factor, Scale model, Sky luminance