Simulation and optimization of advance glazing systems to reduce energy consumption for office buildings in Hong Kong

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Simulation and optimization of advance glazing systems to reduce energy consumption for office buildings in Hong Kong

 

Author: Li, Kuangyi
Title: Simulation and optimization of advance glazing systems to reduce energy consumption for office buildings in Hong Kong
Degree: M.Eng.
Year: 2014
Subject: Glazing
Office buildings -- Energy consumption -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: xiii, 79 leaves : illustrations ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2760613
URI: http://theses.lib.polyu.edu.hk/handle/200/7636
Abstract: Windows are widely installed in high-rise buildings in Hong Kong, and even serve as walls with priority. Meanwhile, windows are considered to be a seriously weak part of building envelopes, easily letting through massive heat gain and loss. This leads to tremendous energy consumption in the buildings to offset the heat gain and loss. Thus, research on glazing to reduce energy consumption is significant and necessary. There have been numerous studies about improving the energy performance of glazing to reduce solar heat gain or thermal conduction through it. Additionally, optimization of window selections has been researched by scholars. This research focuses on various advanced glazing systems utilized in the buildings to reach such energy savings. Different types of advanced glazing systems possess yvarious components or features such as vacuum, water chamber, liquid crystal and thermal properties such as emissivity, absorptivity, reflectivity, conductivity, and solar transmittance. These features and properties directly influence the performance of advanced glazing, while other factors such as window wall ratios (WWR), and orientations also play an essential role in affecting the overall function of advanced glazing systems. Thus, to obtain a comprehensive assessment of advanced glazing systems, a methodology was developed in this dissertation using energy simulation modeling software Energy Plus. Various window thermal properties, window wall ratios and orientation were input into the program. Then annual energy consumption and load were calculated and output. By analyzing the data, the research compares the energy savings of different types of advanced glazing systems, and optimizes the advanced glazing systems by changing the parameters to reduce energy consumption in the buildings under Hong Kong climate. Results in this study mainly cover energy performances of various advanced glazing systems and life cycle cost of these windows. Reflective glazing can be the most energy-efficient window type in Hong Kong, but it may not frequently be beneficial in terms of life cycle cost. Different combinations of window selection are used on the building to optimize the energy performance and economic performance of advanced glazing systems. But more detailed work in the future are needed which involves with balance of economic feasibility and OTTV, and more advanced glazing types should be covered in the future research. With respective and significant results involved with energy saving, this research may be a simple guideline for the simulation and optimization of advanced glazing systems to reduce energy consumption for buildings in Hong Kong.

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