Award Date
5-1-2022
Degree Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Mechanical Engineering
First Committee Member
Douglas Reynolds
Second Committee Member
Brendan O'Toole
Third Committee Member
Darrell Pepper
Fourth Committee Member
Evangelos Yfantis
Fifth Committee Member
Samaan Ladkany
Number of Pages
168
Abstract
The design objectives for HVAC air distribution systems are thermal comfort, good indoor air quality, energy efficiency, low construction cost, and appropriate indoor noise levels. The last objective requires that the designer can predict the attenuation of sound transmitted through an air duct. One form of attenuation commonly introduced to an air distribution system to achieve interior noise criteria is fiberglass liner. Past research has been conducted to obtain reliable and accurate insertion loss (IL) data for duct with fiberglass liner. Empirical efforts have relied on limited data sets. Computational efforts have produced numerical models that are not practical for everyday use by practicing designers. The most recent research in this subject, funded by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) and completed at the University of Nevada, Las Vegas (UNLV), produced considerable IL data based on laboratory measurement. A set of 96 regression equations were developed to predict the IL of ducts with fiberglass liner. The equations and long tables of coefficients did not include frequency as an independent variable. This research project studies the data further and provides new deterministic models that have frequency as an independent variable. Further, these models include equations that predict the level and frequency of the peak IL.
Keywords
duct lining; duct noise; fiberglass lining; HVAC noise control; sound attenuation; sound insertion loss
Disciplines
Acoustics, Dynamics, and Controls | Architectural Engineering | Mechanical Engineering
File Format
File Size
16000 KB
Degree Grantor
University of Nevada, Las Vegas
Language
English
Repository Citation
Schwob, Michael Anthony, "New Mathematical Models for Acoustic Insertion Loss of Fiberglass Lining in HVAC Duct" (2022). UNLV Theses, Dissertations, Professional Papers, and Capstones. 4469.
http://dx.doi.org/10.34917/31813364
Rights
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