Evaluation of combined daylight and cooling requirement of residential buildings

Pao Yue-kong Library Electronic Theses Database

Evaluation of combined daylight and cooling requirement of residential buildings

 

Author: Chan, Hon-yu
Title: Evaluation of combined daylight and cooling requirement of residential buildings
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Dwellings -- Energy conservation -- Evaluation
Buildings -- Energy conservation -- Evaluation
Buildings -- Energy consumption -- Evaluation
Daylighting -- Evaluation
Heat -- Transmission -- Evaluation
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: xi, 113 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1661005
URI: http://theses.lib.polyu.edu.hk/handle/200/1710
Abstract: In Hong Kong, over 90% of population live in high rise residential buildings. According to statistics, the total electricity consumption of residential building increases at a rate of 5.7% per annum in avenge. A survey showed that about one third of total electricity used in residential sector is due to air conditioning and solar heat gain from windows is one of the major source of space cooling load. However, window is also a path letting daylight into interior spaces. The change in brightness due to variations in daylight allows the occupant's eye to change focus and views, relieving stress and fatigue, which is important to occupant's psychological health. Owing to the symmetrical design of residential building in Hong Kong, the building external walls often shade themselves, which reduce not only solar load but also daylight level of the buildings. Therefore, in this study, the self-shading effect of a model residential building on cooling energy consumption and daylight level is evaluated. Besides, the energy performance of common types of fenestration system and glazing material is analyzed. The model building is of 35-storey with eight units per floor, typical of most recent high density residential building projects in Hong Kong Building energy simulation program DOE-2.1E is adopted to perform the calculation, including cooing energy consumption and daylight level under the situation with and without self-shading effect. The findings show that, in the hot season from May to October, self-shading effect reduces about 5-10% cooling energy consumption and 70-80% daylight illuminance level. The extent of reduction depends on the orientation of window. In addition, an analysis on the common design of fenestration system and glazing material in Hong Kong shows that the overhang design window and tinted glass is more effective to reduce solar heat gain.

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