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Title: Active noise control: A tutorial for HVAC designers

Abstract

This article will identify the capabilities and limitations of ANC in its application to HVAC noise control. ANC can be used in ducted HVAC systems to cancel ductborne, low-frequency fan noise by injecting sound waves of equal amplitude and opposite phase into an air duct, as close as possible to the source of the unwanted noise. Destructive interference of the fan noise and injected noise results in sound cancellation. The noise problems that it solves are typically described as rumble, roar or throb, all of which are difficult to address using traditional noise control methods. This article will also contrast the use of active against passive noise control techniques. The main differences between the two noise control measures are acoustic performance, energy consumption, and design flexibility. The article will first present the fundamentals and basic physics of ANC. The application to real HVAC systems will follow.

Authors:
Publication Date:
OSTI Identifier:
538139
Resource Type:
Journal Article
Journal Name:
ASHRAE Journal
Additional Journal Information:
Journal Volume: 39; Journal Issue: 8; Other Information: PBD: Aug 1997
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; NOISE POLLUTION CONTROL; SPACE HVAC SYSTEMS; DESIGN; BLOWERS; DUCTS; ELECTRIC FILTERS; MATHEMATICAL MODELS

Citation Formats

Gelin, L J. Active noise control: A tutorial for HVAC designers. United States: N. p., 1997. Web.
Gelin, L J. Active noise control: A tutorial for HVAC designers. United States.
Gelin, L J. 1997. "Active noise control: A tutorial for HVAC designers". United States.
@article{osti_538139,
title = {Active noise control: A tutorial for HVAC designers},
author = {Gelin, L J},
abstractNote = {This article will identify the capabilities and limitations of ANC in its application to HVAC noise control. ANC can be used in ducted HVAC systems to cancel ductborne, low-frequency fan noise by injecting sound waves of equal amplitude and opposite phase into an air duct, as close as possible to the source of the unwanted noise. Destructive interference of the fan noise and injected noise results in sound cancellation. The noise problems that it solves are typically described as rumble, roar or throb, all of which are difficult to address using traditional noise control methods. This article will also contrast the use of active against passive noise control techniques. The main differences between the two noise control measures are acoustic performance, energy consumption, and design flexibility. The article will first present the fundamentals and basic physics of ANC. The application to real HVAC systems will follow.},
doi = {},
url = {https://www.osti.gov/biblio/538139}, journal = {ASHRAE Journal},
number = 8,
volume = 39,
place = {United States},
year = {1997},
month = {8}
}