Award Date

1-1-1996

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Douglas D. Reynolds

Number of Pages

118

Abstract

Acoustical breakout is the transmission of sound through the walls of heating, ventilation, and air conditioning ducts. Equations for predicting the breakout from rectangular, circular, and oval sheet metal ducts have been published by the American Society of Heating, Ventilation, and Air Conditioning Engineers (ASHRAE); Recent advances in manufacturing techniques have led to the development of fiberglass lined sheet metal ducts, and ducts made from fiberglass ductboard. The equations presented by ASHRAE do not accurately predict the transmission loss from fiberglass ducts; This project involved testing of rectangular and circular sheet metal, lined fiberglass, and fiberboard ducts. The breakout transmission loss was determined experimentally. Regression equations based on the empirical data were derived for each of the duct categories tested. Included are the equations to determine the ring frequency of circular ducts, and the transition frequency for each region of breakout transmission loss presented.

Keywords

Acoustic; Breakout; Ducts; Fiberglass

Controlled Subject

Mechanical engineering; Sound

File Format

pdf

File Size

2498.56 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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