Award Date

5-1-2012

Degree Type

Thesis

Degree Name

Master of Science in Engineering (MSE)

Department

Mechanical Engineering

First Committee Member

Douglas Reynolds

Second Committee Member

Brian Landsberger

Third Committee Member

Samir Moujaes

Fourth Committee Member

Samaan Ladkany

Number of Pages

112

Abstract

A by-product of Heating, Ventilation, and Air-conditioning (HVAC) systems is noise that is produced by fans, compressors, and other related equipments and the noises from the turbulence that is created by moving air. Sometimes, it is impractical to modify the sources of the noise, which requires designers to modify the path of the noise, the duct system. These modifications might include installing an in-duct silencer or acoustical lining on the inside walls of the ducts. The testing and the precise quantification of the performance of these silencers and duct linings are necessary for any designer to be able to make the correct modifications to the ventilation system. The ASTM E477 code calls for strict standardization of the testing of such noise attenuation devices. The ASTM E477 test facility used by the Center for Mechanical & Environmental Systems Technology (CMEST) at UNLV was first constructed in 1991 and required upgrades to meet the newer revisions of the ASTM code. This study includes making modifications to the facility (1) to increase sound input, (2) reduce sound leakage, and (3) to integrate the measurement systems. These upgrades will bring the facility into compliance with the current version of the ASTM E477 test standard.

Keywords

Air ducts; Buildings – Environmental engineering; Duct; HVAC; Liner; Noise; Noise barriers; Noise control; Sheet-metal; Sheetmetal; Silencer

Disciplines

Electro-Mechanical Systems | Engineering | Mechanical Engineering

Language

English


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