Evaluation of combined cooling and daylight with use of advanced glazings in commercial building

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Evaluation of combined cooling and daylight with use of advanced glazings in commercial building


Author: Lau, Ho-sum
Title: Evaluation of combined cooling and daylight with use of advanced glazings in commercial building
Degree: M.Sc.
Year: 2001
Subject: Commercial buildings -- Energy consumption
Commercial buildings -- Energy conservation
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: ix, 67, [18] leaves : ill. ; 30 cm
Language: English
OneSearch: https://www.lib.polyu.edu.hk/bib/b1597781
URI: http://theses.lib.polyu.edu.hk/handle/200/2455
Abstract: Daylight utilization and the application of advance glazing in commercial building are important for energy efficiency. Their impact on the cooling and total energy requirement of a commercial complex building in Hong Kong is presented in this report. The DOE-2.1E energy simulation program was used to determine the annual cooling, lighting and total electricity use and peak electric load. A representative commercial building comprised of a shopping center and an office tower was modeled as a prototype in the simulation study. The performance of conventional single clear glazing was used as the basis for comparison with advanced glazing. Using the prototype model comparison of the energy requirement was made with and without daylight utilization. Daylighting illuminance was assessed by applying a lighting control strategy. The overall thermal transfer value (OTTV) of the prototype building using different glazing was analyzed with respect to the cooling and total energy requirement. The results lead to determination of the desirable properties of the advanced glazing. For overall energy efficiency, the optimum value of the visible transmittance and the coolness index are determined to be 0.65 and greater than 1, respectively. When spectrally selective glazing is used, improved energy performance can be achieved. It is possible to yield reduction of the annual cooling energy by 6.7%, reduction of the electricity consumption by 9.3% and reduction of the peak electric demand by 9.2%. Comparing to a conventional single clear glazing, switchable glazing will be more energy effective for the building if daylighting is utilized. Some glazing properties, such as low shading coefficient, may be good for satisfying the OTTV requirement but not desirable for overall energy efficiency.

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