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

9th Edition of the International SOLARIS Conference

W Li, Danny H.^1 ; Li, Shuyang^1 ; Chen, Wenqiang^1 ; Lou, Siwei^2

Building Energy Research Group, Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong^1

School of Civil Engineering, Guangzhou University, 230 GuangZhou University Town Outer Ring Road, Guangzhou

510006, China^2

关键词: Daylight factors;    Daylight illuminance;    Daylighting design;    Flux theory;    International Commission;    International standards;    Standard skies;    Vertical daylight factor;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/556/1/012044/pdf
DOI  :  10.1088/1757-899X/556/1/012044

来源: IOP

【 摘 要 】

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.