Practical Guide to Noise and Vibration Control, Second …

1 A Practical Guide toNoise and Vibration Controlfor hvac Systems American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ( ). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE s prior written first edition of this book was prepared under ASHRAE Research ProjectRP-526, sponsored by TC , Sound and Vibration . This revised and updatedsecond edition was prepared under the direction of TC THE AUTHORMark E. Schaffer, PE, Member ASHRAE, is president of Schaffer Acoustics Inc.

2 ,a southern California acoustical consulting and testing firm. He has been an acous-tical consultant for 29 years and an hvac subcontractor for 5 years. He is an activemember of ASHRAE Technical Committee , Sound and Vibration , and a co-presenter of the ASHRAE Professional Development Seminar on hvac Noise andvibration control . He has participated in the development of ASHRAE Handbookchapters in that area. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ( ). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE s prior written Society of Heating, Refrigeratingand Air-Conditioning Engineers, Practical Guide toNoise and Vibration Controlfor hvac SystemsSECOND EDITIONMark E.

3 SchafferRP-526 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ( ). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE s prior written 978-1-931862-77-6 Library of Congress control Number: 2005926749 1991, 2005 American Society of Heating, Refrigeratingand Air-Conditioning Engineers, Tullie Circle, , GA rights edition 1991 Second edition 2005 Printed in the United States of AmericaCover design by Tracy has compiled this publication with care, but ASHRAE has not investigated, andASHRAE expressly disclaims any duty to investigate, any product, service, process, procedure,design, or the like that may be described herein.

4 The appearance of any technical data or edito-rial material in this publication does not constitute endorsement, warranty, or guaranty byASHRAE of any product, service, process, procedure, design, or the like. ASHRAE does notwarrant that the information in the publication is free of errors, and ASHRAE does not neces-sarily agree with any statement or opinion in this publication. The entire risk of the use of anyinformation in this publication is assumed by the part of this book may be reproduced without permission in writing from ASHRAE, exceptby a reviewer who may quote brief passages or reproduce illustrations in a review with appro-priate credit.

5 Nor may any part of this book be reproduced, stored in a retrieval system, or trans-mitted in any way or by any means electronic, photocopying, recording, or other withoutpermission in writing from STAFFSPECIAL PUBLICATIONSM ildred GeshwilerEditorErin HowardAssociate EditorChristina HelmsAssociate EditorMichshell PhillipsSecretaryPUBLISHING SERVICESD avid SoltisManagerJayne JacksonProduction AssistantPUBLISHERW. Stephen Comstock American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ( ). For personal use only.

6 Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE s prior written 1 General Design Guidelines1 Chapter 2 Airside Equipment25 Chapter 3 Waterside Equipment73 Chapter 4 Packaged and Unitary Equipment89 Chapter 5 Vibration Isolation101 Chapter 6 Specifications117 Chapter 7 Construction Phase Tasks125 Chapter 8 Troubleshooting Noise and Vibration Complaints143 Appendix A Some Basics of hvac Acoustics167 Appendix B Acoustical Rating Systems and Criteria177 Appendix C Measuring hvac System Noise191 Appendix D Using

7 Manufacturers Sound Data197 Appendix E Definitions and Abbreviations201 Appendix F Addresses of Agencies and Associations207 Appendix G Bibliography and Selected References209 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ( ). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE s prior written of an air-handling unit room with several acoustical of an air-handling unit room with optimal acoustical 11-1 Guideline for duct chase, shaft.

8 And enclosure comparison of various building core area for the preliminary selection of mechanical room mechanical penthouse equipment air path used for sound attenuation at an equipment room ventilation Noise control for mechanical Noise control using an auxiliary views through two types of floating floor transmission at perimeter mechanical conduit routing into a mechanical lagging for Noise of rumbly and quieter parallel fan for a basement built-up fan duct silencer arrangement at vane-axial American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.

9 ( ). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE s prior written and refracted equipment sound at a building support of rooftop equipment for Vibration for mechanical room wall and pipe penetrations through view of return air shaft with supply duct takeoffs obstructing return comparison of several duct chase, shaft, and enclosure typical duct control duct 22-1 Inlet and discharge octave band LW values for a 36 in. plenum power level comparison for three types of centrifugal for centrifugal fan fan airflow view into a mixed flow fan sound power level for ducted axial flow fan for unducted axial flow fan side of a direct-drive plenum side of a belt-drive plenum roof ventilators (mushroom fans)

10 Mounted on intake duct silencers and roof type exhaust fan on Vibration -isolated roof octave band LW comparison for three propeller fan with a 12-socket aluminum hub and plastic propeller fan with backswept airfoil hood for propeller fan Noise isolation suspension for propeller and quiet installations of ceiling-mounted exhaust clearance at AHU and cabinet fan AHU with supply ducts attached to the top of discharge sketch of a plenum fan air-handling American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.