Acoustics control of room ventilators

Pao Yue-kong Library Electronic Theses Database

Acoustics control of room ventilators

 

Author: Ng, Fung-lin
Title: Acoustics control of room ventilators
Degree: M.Sc.
Year: 2001
Subject: Hong Kong Polytechnic University -- Dissertations
Ventilation -- Noise
Noise control
Department: Dept. of Civil and Structural Engineering
Pages: viii, 65, 81 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1611635
URI: http://theses.lib.polyu.edu.hk/handle/200/4987
Abstract: The objective of this project is to find out the feasible ways to achieve the optimal acoustic design for room ventilators in Hong Kong.The methodology used in this project is to make use of a computer spreadsheet to calculate the resultant sound level. In this project, it was focused on classroom in school design 2000 in Hong Kong which includes heat and recovery ventilators, dissipative silencer, panel type silencer, lining and a combination of the said acoustic treatment. The reason for only focusing on fan noise is that fan represents the major noise source equipment of the ventilation and air-conditioning system in classroom. The spreadsheet designed is not only applicable to school design 2000 in Hong Kong, but can also be used in other environment. The spreadsheet provides a convenient way to determine the feasible solutions in respect to noise and ventilation criteria.Apart from analysing the results obtained from the simulation to find cut the optimized solution, the energy consumption is also a criterion for determination of optimal solution. An acoustic design procedure for ventilation system is also suggested as a guideline for engineers. Besides studying the acoustic control of heat and recovery ventilators used in classroom, the application of heat and recovery ventilators and its associated acoustic treatment in bedrooms is also worked out. In evaluating type of acoustic treatment to be applied for simulation, it is found that the panel type silencer is good to attenuate low-frequency noise and have many advantages over the conventional dissipative silencer in the view of reliability, hygiene and maintenance. Thus, this new panel type silencer can be used as a substitution for conventional dissipative silencer especially in controlling low-frequency noise.

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