Environmental friendly assessment of noise control methods in air-conditioning ductworks

Pao Yue-kong Library Electronic Theses Database

Environmental friendly assessment of noise control methods in air-conditioning ductworks


Author: Tai, Tak Yin
Title: Environmental friendly assessment of noise control methods in air-conditioning ductworks
Degree: M.Eng.
Year: 2012
Subject: Air conditioning -- Noise.
Ventilation -- Noise.
Noise control.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: ix, 77, 76 leaves : ill. (chiefly col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2525565
URI: http://theses.lib.polyu.edu.hk/handle/200/6645
Abstract: Environmental problems including global warming, ozone layer depletion and energy crisis have let to the development of solutions to alleviate their impacts. However, in studies of the large building services systems which usually dominate the building energy consumption, acoustic control systems in mechanical ventilation and air-conditioning system (MVAC) were overlooked. This has led to obvious negative effect on the environment when significant amount of control system units installed in MVAC is the corollary of need for proper selection of acoustic control systems. This dissertation provides solutions to evaluate the sustainable performances of acoustic control methods including the silencer, the duct lining, active noise control and semi-active noise control and select the most appropriate control method in term of sustainability. Two analytical models, analytical hierarchy process (AHP) and life cycle analysis (LCA), were used to analyze environmental, social as well as human impacts of the control methods. AHP involved survey to collect intangible information, such as system complexity and performance to human comfort. The survey targets involved experts including local university professors and acoustic consultants (totally 13 respondents). LCA involved computer simulation of LCA TOOL provided by Electrical and Mechanical Services Department (EMSD) to collect tangible information, such as resource depletion, carbon emission and energy consumption. The results of the models showed that the silencer performed the best in AHP while the duct lining performed the best in LCA. This difference was directly attributable to the misunderstanding of sustainable development of noise control methods, as the respondents believed that the lower the initial cost and resource depletion, the more sustainable the methods are. However, LCA results showed that sustainable performance also depended on the life span of the systems and differences between initial and operation stages. The combined result showing the sequence from most sustainable to least sustainable was: duct lining, silencer, active noise control and semi-active noise control respectively.

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