Practical Guide to Noise and Vibration Control for HVAC Systems 2nd Edition, ISBN-13: 978-1936504022
[PDF eBook eTextbook]
- 234 pages
- Publisher: American Society of Heating, Refrigerating and Air-Conditioning Engineers; 2 edition
- Language: English
- ISBN-10: 1936504022
- ISBN-13: 978-1936504022
For engineers, architects, contractors, and other building industry professionals who have little or no experience with acoustical terms or concepts. This book presents practical design guidelines supplementing information found in the Sound and Vibration chapters of the ASHRAE Handbook and includes information for developing system designs minimizing the possibility of excessive HVAC system noise and vibration in and around buildings.
The text explains how to conduct troubleshooting investigations to resolve noise and vibration problems. Extensively revised, it highlights the acoustical features of a wide range of HVAC system components, is up to date on new noise and vibration control products, and discusses new strategies for selecting equipment and designing systems.
Over the past few decades, building design teams have become more aware of the potential noise and vibration problems from HVAC systems. Mechanical engineers are specifying sound traps (duct silencers), acoustical louvers, sound-absorbing duct liners, and vibration isolators, while architects are designing mechanical room walls and slabs with high sound transmission class (STC) ratings. Despite the addition of these noise and vibration control features in more and more building designs, complaints of excessive HVAC system noise and vibration are still common. Investigations into these complaints by acoustical professionals have found that, in many cases, the correct equipment and materials were used, but they were not properly integrated into a quiet system, or some seemingly insignificant detail was omitted that negated the expected acoustical benefit.
Correcting a noise or vibration problem usually costs much more than preventing one. The real costs include not only the direct payments to the retrofitting contractor but also the time required to coordinate the investigation and retrofit and the loss of goodwill from the complaining tenants. Therefore, in most cases the slight extra cost for prevention (usually about 1% to 2% of the total HVAC system cost) is money well spent.
Specifying quiet equipment and adding noise control materials to an HVAC system design are necessary initial steps of the design process. Calculations during the initial steps can be used to estimate the sound levels in a room or to select noise control materials to achieve a design goal. Comparing equipment sound data for competing products can help in the selection of quiet equipment. However, design decisions based on such work lose their value if the equipment and materials are not integrated into a properly designed system or if certain system detailing is ignored.
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