Analysis of Point Daylight Factor (PDF) Average Daylight Factor (ADF) and Vertical Daylight Factor (VDF) under various unobstructed CIE Standard Skies

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Original languageEnglish
Article number012044
Journal / PublicationIOP Conference Series: Materials Science and Engineering
Online published19 Aug 2019
Publication statusPublished - 2019


Title9th International SOLARIS Conference, SOLARIS 2018
Period30 - 31 August 2018



The usual method for computing natural illuminance for a given location in a building is the daylight factor (DF) approach, which is based on the traditional overcast sky without sunlight, as defined by the International Commission on Illumination (CIE). In 2003, the CIE adopted a range of 15 skies as international standard models that represent the actual skies of many places and cover the whole probable spectrum of skies found in nature. Previously, we developed a number of calculation tools to predict daylight illuminance for rooms facing different orientations under various CIE Standard skies. This paper presents the work on the calculation of the point DF (PDF), average DF (ADF) and vertical DF (VDF) under various overcast and non-overcast skies. The strong correlations between these three DF types can help to estimate the required DF values for architectural and daylighting designs and evaluations.

Research Area(s)

  • Average Daylight Factor, CIE Standard Skies, Point Daylight Factor, Split-flux theory, Vertical Daylight Factor

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