A theoretical model for the direct evaluation of daylighting performance in a space under cloudy sky condition

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A theoretical model for the direct evaluation of daylighting performance in a space under cloudy sky condition

 

Author: Luk, Ho-wai
Title: A theoretical model for the direct evaluation of daylighting performance in a space under cloudy sky condition
Degree: M.Eng.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
Daylighting -- Evaluation.
Commercial buildings -- China -- Hong Kong -- Lighting.
Commercial buildings -- Energy consumption -- China -- Hong Kong.
Department: Dept. of Building Services Engineering
Pages: viii, 83, [24] leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2117580
URI: http://theses.lib.polyu.edu.hk/handle/200/3367
Abstract: Windows in buildings significantly affect the energy use. If the daylight can be utilized effectively, the peak cooling load can be reduced. The Canadian Standards Association (CSA) had developed the first window energy rating system (WERS) for residential buildings. However, there is no such a daylight system for the commercial office buildings. In this project, a specific window energy rating system for commercial office buildings will be developed. The success of this project will have very positive long-term effects. The knowledge of relationship between the window properties, building design parameters and operation strategies and the window energy performance and daylight use in a densely-packed urban environment can be better understood. Simplified evaluation and design tools will encourage and assist the importer and professionals to import or use windows with high energy performance. This will change the conventional use and selection of windows in the commercial office buildings in Hong Kong, which will significantly reduce annual energy use. The research work can be further extended to different building forms and types, and to buildings in South China. The major outcome proposed in this project is a theoretical model for the direct evaluation of daylighting performance in a space under cloudy sky condition. The model can also be used for evaluating of the average energy performance of windows in the commercial office buildings in Hong Kong. It is very important that assisting designers to combine operation strategies, building parameters and window properties to minimize electrical lighting use in the world for different climates and conditions.

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