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

Danny H W Li; Shuyang Li; Wenqiang Chen; Siwei Lou

doi:10.1088/1757-899X/556/1/012044

Author(s)

Related Research Unit(s)

Department of Architecture and Civil Engineering

Detail(s)

Original language	English
Article number	012044
Journal / Publication	IOP Conference Series: Materials Science and Engineering
Volume	556
Online published	19 Aug 2019
Publication status	Published - 2019

Conference

Title	9th International SOLARIS Conference, SOLARIS 2018
Place	China
City	Chengdu
Period	30 - 31 August 2018

Link(s)

DOI	DOI https://doi.org/10.1088/1757-899X/556/1/012044 Final Published version
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Attachment(s)	Documents 37506768.pdf Final Published version, 612 KB, PDF Publisher's Copyright Statement This full text is made available under CC-BY 3.0. https://creativecommons.org/licenses/by/3.0/
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85072106082&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(af025d2f-6ff7-4e8b-a166-10cac8a11e30).html

Abstract

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.