The Long Island Chapter of ASHRAE (the American Society of Heating, Refrigeration, and Air Conditioning Engineers) is dedicated to advancing the arts and sciences of the HVAC industry, supporting ASHRAE's strategic plan, and providing personal development opportunities for our members. Learn More
Next Chapter Meeting(Virtual only this month):
Duct System Acoustics (1 PDH)
Presented by Patrick Brooks, PE
Senior Project Manager for SMACNA
ASHRAE Distinguished Lecturer
Tuesday, January 11th
For meeting information and RSVP
Please email Murat: email@example.com
Duct System Acoustics (1PDH credit)
Patrick Brooks, PE Senior Project Manager for SMACNA, ASHRAE Distinguished Lecturer
This presentation covers the fundamentals of calculating duct system acoustics. The designer will learn what noise is, how to mathematically combine noise levels is and how to control noise in duct systems. Frequency and amplitude and how people perceive noise are important concepts that are also covered. The designer will also learn the difference between sound power and sound pressure and how to convert sound power levels to sound pressure. The range of hearing and the problems with low frequency noise vs high frequency noise is discussed. Natural attenuation of duct elements and how to determine it will be reviewed. How to solve acoustic problems using distance, silencers and duct insertion losses are examined as well as how noise criteria (NC) levels are used.
Patrick “Pat” Brooks is a Professional Engineer with over 40 years of experience focusing on duct and acoustics design, duct construction and duct fabrication as well as being a general manager and a director of manufacturing.
Pat received his undergraduate degree in Mechanical Engineering in 1978 from The Ohio State University in Columbus Ohio. He received a Master of Science Degree in Mechanical Engineering from the same University in 1986. He also received a Master of Business Administration from The Ohio State University in 1990. He has served as the Manager of Research and Development, General Manager and Director of Manufacturing while at United McGill Corporation. He has also been a General Manager for Eastern Sheet Metal, Inc. and is currently a Senior Project Manager with the Sheet Metal and Air Conditioning Contractors’ National Association, In.c (SMACNA).
As the Manager of the Research and Development department at United McGill, Pat oversaw the development of friction loss and loss coefficients for many types of duct and fittings that are in the ASHRAE Duct Fitting Database, an ASHRAE web-based program used to determine pressure losses that he also helped to develop. He also developed a state-of-the-art duct design program and wrote many technical bulletins and reports. As a General Manager at United McGill and later at Eastern Sheet Metal, he oversaw general operations of the manufacturing and sales of sheet metal ductwork. As Director of Manufacturing he oversaw all manufacturing operations for United McGill including sheet metal ductwork, acoustical panels and silencers, and air pollution control equipment. Now as a Senior Project Manager at SMACNA he helps write and maintain their duct construction, sound and vibration and duct design manuals, as well as write technical papers. He also provides technical support to the Association’s many contractor members. Pat also gives duct construction and other seminars to the sheet metal contractors as well as code officials and engineers. He was also an instructor in duct design and acoustics at the University of Wisconsin.
Pat is an active participant with ASHRAE, SPIDA, AWS and AMCA. He is the ASHRAE Duct Design Guide Chair and Duct Fitting Database Chair and has been a member of the TC5.2 Duct Design committee with over 30 years of service. He is also a member of SPIDA and serves as their technical Chair giving technical support to its members and helping develop research for the round and flat oval spiral duct industry and has given seminars on behave of SPIDA. Pat also is a member of the COVID mitigation committee for AMCA and help develops guidelines for new and existing buildings. He is a committee member of AWS 9.1 Sheet Metal Welding Code.
Pat has published several papers on duct design, duct leakage, acoustics and COVID mitigation including:
09/24/2020 HVAC COVID-19 Guidance SMACNA
12/05/2019 HVAC Duct Air Leakage SMACNA
12/01/2010 ASHRAE Standard 90.1 and Leakage The NEBB Professional
10/01/2007 Industrial Noise Control Occupational Health & Safety
04/01/2001 Designing Industrial Exhaust Systems ASHRAE Journal
04/01/1995 Duct Design Fundamentals ASHRAE Journal
06/18/1990 Computer-aided duct design: Comparing the methods Air Conditioning, Heating & Refrigeration News
The ASHRAE Long Island Chapter would acknowledge and thank all those who Sponsored the Chapter and donated generously to the Research Promotion Campaign.
ASHRAE Chapter Sponsorship
ASHRAE Long Island Research Promotion
ASHRAE.org has been making many resources available on their website: Handbook chapters, and free Standards and Guidelines editions for online reading. Please take a look at the links below.
ASHRAE EPIDEMIC TASK FORCE (BUILDING READINESS)
ASHRAE EPIDEMIC TASK FORCE (SCHOOLS AND UNIVERSITIES)
GUIDANCE FROM OTHERS