4.5 Article

Evaluation of a Simple Method for Determining the Vertical Daylight Factor against Full-Scale Measured Data

Journal

INDOOR AND BUILT ENVIRONMENT
Volume 18, Issue 6, Pages 477-484

Publisher

SAGE PUBLICATIONS LTD
DOI: 10.1177/1420326X09337042

Keywords

vertical daylight factor; obstructions; computer simulation; reflectance; overcast skies

Funding

  1. Research Grants Council of the Hong Kong Special Administrative Region, China [1001-PPR-2]
  2. City University of Hong Kong studentship

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Hong Kong is one of the most densely populated cities in the world. Its buildings are largely high-rise blocks constructed close to each other and, hence outdoor obstructions play significant roles in daylighting designs. The light reflected from the ground and surrounding buildings can be important sources of interior lighting and detailed computations are required. We currently propose a calculation procedure in terms of a number of regression equations to determine the daylight illuminance on vertical surfaces. This paper presents the work to assess this approach via full-scale measurements under real sky conditions. The mean surface reflectance for external obstructions was estimated using lighting simulation techniques. It was shown that daylight illuminance obtained by the proposed method were in reasonably good agreement with measured readings. The simple nature of the proposed approach offers building professionals and students a reliable and convenient alternative to predict daylight illuminance particularly when different daylighting schemes and concepts are being considered.

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