ASHRAE 120-2017 Method of Testing to Determine Flow Resistance of HVAC Ducts and Fittings.pdf
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1、ANSI/ASHRAE Standard 120-2017(Supersedes ANSI/ASHRAE Standard 120-2008)Method of Testingto DetermineFlow Resistance ofHVAC Ducts and FittingsApproved by ASHRAE on January 31, 2017, and by the American National Standards Institute on February 1, 2017.ASHRAE Standards are scheduled to be updated on a
2、five-year cycle; the date following the Standard number is the year ofASHRAE approval. The latest edition of an ASHRAE Standard may be purchased on the ASHRAE website (www.ashrae.org)or from ASHRAE Customer Service, 1791 Tullie Circle, NE, Atlanta, GA 30329-2305. E-mail: ordersashrae.org. Fax: 678-5
3、39-2129. Telephone: 404-636-8400 (worldwide) or toll free 1-800-527-4723 (for orders in US and Canada). For reprintpermission, go to www.ashrae.org/permissions. 2017 ASHRAE ISSN 1041-2336SPECIAL NOTEThis American National Standard (ANS) is a national voluntary consensus Standard developed under the
4、auspices of ASHRAE. Consensus is definedby the American National Standards Institute (ANSI), of which ASHRAE is a member and which has approved this Standard as an ANS, as“substantial agreement reached by directly and materially affected interest categories. This signifies the concurrence of more th
5、an a simple majority,but not necessarily unanimity. Consensus requires that all views and objections be considered, and that an effort be made toward their resolution.”Compliance with this Standard is voluntary until and unless a legal jurisdiction makes compliance mandatory through legislation. ASH
6、RAE obtains consensus through participation of its national and international members, associated societies, and public review.ASHRAE Standards are prepared by a Project Committee appointed specifically for the purpose of writing the Standard. The ProjectCommittee Chair and Vice-Chair must be member
7、s of ASHRAE; while other committee members may or may not be ASHRAE members, allmust be technically qualified in the subject area of the Standard. Every effort is made to balance the concerned interests on all Project Committees. The Senior Manager of Standards of ASHRAE should be contacted fora. in
8、terpretation of the contents of this Standard,b. participation in the next review of the Standard,c. offering constructive criticism for improving the Standard, ord. permission to reprint portions of the Standard.DISCLAIMERASHRAE uses its best efforts to promulgate Standards and Guidelines for the b
9、enefit of the public in light of available information and acceptedindustry practices. However, ASHRAE does not guarantee, certify, or assure the safety or performance of any products, components, or systemstested, installed, or operated in accordance with ASHRAEs Standards or Guidelines or that any
10、 tests conducted under its Standards or Guidelineswill be nonhazardous or free from risk.ASHRAE INDUSTRIAL ADVERTISING POLICY ON STANDARDSASHRAE Standards and Guidelines are established to assist industry and the public by offering a uniform method of testing for rating purposes, bysuggesting safe p
11、ractices in designing and installing equipment, by providing proper definitions of this equipment, and by providing other informationthat may serve to guide the industry. The creation of ASHRAE Standards and Guidelines is determined by the need for them, and conformanceto them is completely voluntar
12、y.In referring to this Standard or Guideline and in marking of equipment and in advertising, no claim shall be made, either stated or implied,that the product has been approved by ASHRAE.ASHRAE Standing Standard Project Committee 120Cognizant TC: 5.2, Duct DesignSPLS Liaison: Peter SimmondsKevin J.
13、Gebke*, Chair Gary L. Miller*, Secretary Alex M. Kouvolo*Herman F. Behls*, Vice-Chair Patrick J. Brooks* Stephen R. Wiggins*Stephen A. Idem* Denotes members of voting status when the document was approved for publicationASHRAE STANDARDS COMMITTEE 20162017Rita M. Harrold, Chair Michael W. Gallagher C
14、yrus H. NasseriSteven J. Emmerich, Vice-Chair Walter T. Grondzik David RobinJames D. Aswegan Vinod P. Gupta Peter SimmondsNiels Bidstrup Susanna S. Hanson Dennis A. StankeDonald M. Brundage Roger L. Hedrick Wayne H. Stoppelmoor, Jr.Drury B. Crawley Rick M. Heiden Jack H. ZarourJohn F. Dunlap, Sriniv
15、as Katipamula William F. Walter, BOD ExOJames W. Earley, Jr. Cesar L. Lim Patricia Graef, COKeith I. Emerson Arsen K. MelikovJulie M. Ferguson R. Lee Millies, Jr.Stephanie C. Reiniche, Senior Manager of StandardsCONTENTSANSI/ASHRAE Standard 120-2017,Method of Testing to Determine Flow Resistance of
16、HVAC Ducts and FittingsSECTION PAGEForeword .21 Purpose.22 Scope23 Definitions, Symbols, and Subscripts24 Compliance Requirements35 Applicability .36 Instrumentation .37 Flow Measuring Systems and Test Setups.68 Observations and Conduct of Test89 Calculations.910 Test Results and Report1311 Referenc
17、es13Informative Annex ATime-Weighted Average33Informative Annex BLeakage Measurement35Informative Annex CFlexible Duct Test Setup Guide 41Informative Annex DExample Test Systems .45NOTEApproved addenda, errata, or interpretations for this standard can be downloaded free of charge from the ASHRAEwebs
18、ite at www.ashrae.org/technology. 2017 ASHRAE1791 Tullie Circle NE Atlanta, GA 30329 www.ashrae.org All rights reserved.ASHRAE is a registered trademark of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.ANSI is a registered trademark of the American National Stand
19、ards Institute.2 ANSI/ASHRAE Standard 120-2017(This foreword is not part of the standard. It is merelyinformative and does not contain requirements necessaryfor conformance to the standard. It has not been pro-cessed according to the ANSI requirements for a standardand may contain material that has
20、not been subject topublic review or a consensus process. Unresolved objec-tors on informative material are not offered the right toappeal at ASHRAE or ANSI.)FOREWORDFirst published in 1999, ASHRAE Standard 120 establishesuniform methods of laboratory testing of HVAC ducts and fit-tings to determine
21、their resistance to airflow. The fittinglosses, which are reported as local loss coefficients, are usedto update and refine the ASHRAE Duct Fitting Database. Todate, at least eight research projects have used the test meth-ods of Standard 120 to improve this database. The significantchange to this e
22、dition of the standard is that the lengthupstream of the test duct or fitting was increased from 10 to15 hydraulic diameters.1. PURPOSEThis standard establishes uniform methods of laboratory test-ing of HVAC ducts and fittings to determine their resistanceto airflow.2. SCOPE2.1 This standard may be
23、used to determine the change intotal pressure resulting from airflow in HVAC ducts and fit-tings.2.2 The test results can be used to determine duct flow lossesin pressure loss per unit length. Fitting losses are reported aslocal loss coefficients.2.3 This standard does not cover interpretation of te
24、st data.3. DEFINITIONS, SYMBOLS, AND SUBSCRIPTS3.1 Definitions accuracy: the degree of conformity of an indicated value toan accepted standard value or true value. The degree of inac-curacy is known as “total measurement error” and is the sumof bias error and precision error.bias error (systematic e
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