Daylighting assessment by average daylight factor

Pao Yue-kong Library Electronic Theses Database

Daylighting assessment by average daylight factor

 

Author: So, Ka-shun
Title: Daylighting assessment by average daylight factor
Degree: M.Sc.
Year: 2003
Subject: Hong Kong Polytechnic University -- Dissertations
Daylighting -- Evaluation
Daylight -- Measurement
Department: Dept. of Building Services Engineering
Pages: vii, 64 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1733110
URI: http://theses.lib.polyu.edu.hk/handle/200/2971
Abstract: Daylighting in buildings provides positive contribution in replacing the need for electricity used for artificial interior lighting. It is highly desirable to consider the contribution of daylight in building design in order to achieve improvements of energy efficiency and environmental performance of buildings. The Hong Kong Building Environmental Assessment Methods (HK-BEAM) had included the assessment of daylight performance to be a part of the overall environmental performance evaluation for giving different levels of certification to buildings. Due to the lack of local data, the daylighting criteria are based essentially on recommendations and guidelines used in the UK. Experience in actual building assessment using HK-BEAM reveals difficulties in applying the average daylight factor in local office buildings. It is therefore necessary to test the validity of the UK based criteria for use in Hong Kong where different climate and different building density are found. This dissertation presents a study to the accepted standards of daylight performance used in other places and to test the validity of the CIBSE formula to calculate average daylight factor by the use of a computer lighting simulation program called SUPERLITE. Room models of different sizes, window and subjection to external obstructions were created to compare the values of average daylight factors calculated by the CIBSE formula and that obtained from the simulation program. A few field measurements were also recorded for further comparison purpose.

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