1、BSI Standards PublicationBS ISO 27327-2:2014Fans Air curtain unitsPart 2: Laboratory methods of testing forsound powerBS ISO 27327-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 27327-2:2014.The UK participation in its preparation was entrusted to Techn
2、icalCommittee MCE/17, Fans.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014
3、. Published by BSI StandardsLimited 2014ISBN 978 0 580 77686 1ICS 17.140.20; 23.120Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2014.Amendments issued
4、since publicationDate Text affectedBS ISO 27327-2:2014 ISO 2014Fans Air curtain units Part 2: Laboratory methods of testing for sound powerVentilateurs Rideaux dair Partie 2: Mthodes dessai en laboratoire des niveaux de puissance acoustiqueINTERNATIONAL STANDARDISO27327-2First edition2014-02-15Refer
5、ence numberISO 27327-2:2014(E)Corrected version2014-03-01BS ISO 27327-2:2014ISO 27327-2:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by an
6、y means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Gen
7、eva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 27327-2:2014ISO 27327-2:2014(E) ISO 2014 All rights reserved iiiContents PageForeword vIntroduction vi1 Scope . 12 Normative references 13 Terms, definitions, symbols and units . 23.
8、1 Terms and definitions . 23.2 Air curtain unit sound power levels . 33.3 Other symbols 34 Limitations on use . 44.1 General . 44.2 Noise source 54.3 Character of noise . 54.4 Uncertainty . 54.5 Quantities to be measured 55 Measurement uncertainty 56 Instrumentation 76.1 General . 76.2 Frequency ana
9、lyser . 76.3 Turbulence screens and windshields 76.4 Reference sound source (RSS) . 87 Test procedure 87.1 Comparison method . 87.2 Direct method 88 Acoustic environment . 88.1 Test environment 88.2 Reverberant room 89 Air curtain unit installation conditions 910 Air curtain unit operating condition
10、s . 910.1 General . 910.2 Measurement of ambient conditions . 910.3 Air curtain unit rotational speed . 910.4 Determination of air curtain unit aerodynamic operating point . 910.5 Control of air curtain unit operating condition 911 Test setup . 911.1 Setup categories . 911.2 Sound pressure levels 14
11、11.3 Aerodynamic performance 1511.4 Test conditions . 1511.5 Mounting methods 1511.6 Microphone travel or positions . 1512 Information to be recorded 1612.1 General 1612.2 Air curtain unit under test . 1712.3 Acoustic environment 1712.4 Acoustical data appropriate to the method of test1813 Calculati
12、ons and evaluations 1913.1 Calculation of one-third octave band levels 1913.2 Calculation of overall sound power levels 1913.3 Calculation of A-weighted sound power level . 19BS ISO 27327-2:2014ISO 27327-2:2014(E)iv ISO 2014 All rights reserved13.4 Background corrections . 2013.5 Sound power level,
13、LW. 2013.6 Evaluation . 2114 Test report 2114.1 General 2114.2 Description of test site, arrangement of fan, location of measuring points.2114.3 Instrumentation used 2214.4 Subjective assessment of the noise character . 2214.5 Measured values of the noise character . 22Annex A (normative) Effect of
14、rotational speed changes .23Annex B (normative) Uncertainty analysis 24Annex C (normative) Calibration of reference sound source.28Annex D (informative) Filter weighted measurements 30Annex E (normative) Room qualification for sound sources with broadband sound 31Annex F (informative) Room qualifica
15、tion for sound sources with pure tones/narrow-band sound 33Bibliography .37BS ISO 27327-2:2014ISO 27327-2:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards
16、is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take pa
17、rt in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particu
18、lar the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this
19、 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.i
20、so.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the W
21、TO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 117, Fans.ISO 27327 consists of the following parts, under the general title Fans Air curtain units: Part 1: Laboratory methods of t
22、esting for aerodynamic performance rating Part 2: Laboratory methods of testing for sound powerThe following parts are under preparation: Part 3: Test method to determine energy effectiveness Technical ReportThis corrected version of ISO 27327-2:2014 incorporates the following correction: the senten
23、ce “This first edition of ISO 27327-2:2014 cancels and replaces ISO 13347-1:2004 and ISO 13347-2:2004” has been removed from the Foreword. ISO 2014 All rights reserved vBS ISO 27327-2:2014ISO 27327-2:2014(E)IntroductionThe need for this part of ISO 27327 has been evident for some time. While a numbe
24、r of national standards exist for the measurement of fan noise, none addressed the particular considerations required for the noise testing of air curtain units.Forming part of the ISO/TC 117 series of fan standards, this part of ISO 27327 deals with the determination of the air curtain unit sound p
25、ower level appropriate to a particular application. In describing the test and rating procedures, numerous references are made to ISO 5801 and ISO 13347, as well as to other ISO standards.The test procedures described in this part of ISO 27327 relate to laboratory conditions. The measurement of perf
26、ormance under site conditions is not included. Acoustic system effects can be considerable where the airflow into and out of the air curtain unit is not free from swirl nor fully developed.This part of ISO 27327 describes methods for determining sound power levels of air curtain units in one-third-o
27、ctave bandwidths and one-octave bandwidths.Data obtained in accordance with this part of ISO 27327 can be used for the following purposes, amongst others:a) comparison of air curtain units which are similar in size and type;b) comparison of air curtain units which are different in size, type, design
28、, speed, etc.;c) determining whether an air curtain unit is suitable for a specified upper limit of sound emission;d) scaling air curtain unit noise from one size and speed to another size and speed of the same type of air curtain unit;e) prediction of sound pressure level in application of the air
29、curtain unit;f) engineering work to assist in developing machinery and equipment with lower sound emissions.vi ISO 2014 All rights reservedBS ISO 27327-2:2014Fans Air curtain units Part 2: Laboratory methods of testing for sound power1 ScopeThis part of ISO 27327 deals with the determination of the
30、acoustic performance of air curtain units. In addition, it can be used to determine the acoustic performance of air curtain units combined with an ancillary device.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable fo
31、r its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 266:1997, Acoustics Preferred frequenciesISO 3740:2000, Acoustics Determination of sound power levels of noise sources
32、 Guidelines for the use of basic standardsISO 3741:2010, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for reverberation test roomsISO 3743-1, Acoustics Determination of sound power levels and sound energy levels of nois
33、e sources using sound pressure Engineering methods for small movable sources in reverberant fields Part 1: Comparison method for a hard-walled test roomISO 3743-2, Acoustics Determination of sound power levels of noise sources using sound pressure Engineering methods for small, movable sources in re
34、verberant fields Part 2: Methods for special reverberation test roomsISO 3747, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering/survey methods for use in situ in a reverberant environmentISO 5801:2007, Industrial fans Performance
35、 testing using standardized airwaysISO 6926:1999, Acoustics Requirements for the performance and calibration of reference sound sources used for the determination of sound power levelsISO 13347-1:2004, Industrial fans Determination of fan sound power levels under standardized laboratory conditions P
36、art 1: General overviewISO 13347-2:2004, Industrial fans Determination of fan sound power levels under standardized laboratory conditions Part 2: Reverberant room methodISO 13349:2010, Fans Vocabulary and definitions of categoriesISO 27327-1:2009, Fans Air curtain units Part 1: Laboratory methods of
37、 testing for aerodynamic performance ratingINTERNATIONAL STANDARD ISO 27327-2:2014(E) ISO 2014 All rights reserved 1BS ISO 27327-2:2014ISO 27327-2:2014(E)3 Terms, definitions, symbols and units3.1 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 3740, IS
38、O 3747, ISO 5801, ISO 13347-1, ISO 13347-2, ISO 13349, ISO 27327-1 and the following apply.3.1.1inlet sound power levelsound power level of an air curtain unit determined at the air curtain unit inlet in test installation type A3.1.2outlet sound power levelsound power level of an air curtain unit de
39、termined at the air curtain outlet in test installation type A3.1.3total sound power levelsound power level of an air curtain unit in test installation type E3.1.4casing sound power levelsound power level radiated from an air curtain unit casingNote 1 to entry: If the air curtain unit drive is exter
40、nal to the air curtain unit casing, the casing sound power shall include the sound power generated by and radiated from the air curtain unit drive.3.1.5frequency range of interestfrequency range including octave bands with centre frequencies between 63 Hz and 8 000 Hz and one-third octave bands with
41、 centre frequencies between 50 Hz and 10 000 HzNote 1 to entry: For special purposes, the frequency range can be extended at either end, provided that the test environment and instrument accuracy are satisfactory for use over the extended frequency range. For air curtain units which radiate sound at
42、 predominantly high (or low) frequency, the frequency range of interest can be limited in order to optimize the test facility and procedures.3.1.6blade passage frequency (BPF)frequency of air curtain unit impeller blades passing a single fixed objectNote 1 to entry: The blade passage frequency is ca
43、lculated by the following formula:BPF=60Hzxnwherex is the number of blades;n is the fan speed, expressed in revolutions per minute.3.1.7chamberenclosure used to regulate flow and absorb sound; it can also conform to air test chamber conditions outlined in ISO 58012 ISO 2014 All rights reservedBS ISO
44、 27327-2:2014ISO 27327-2:2014(E)3.1.8air curtain unit inlet area1summation of open areas (slots, holes, louvres, openings, etc.) through which air will flow into the air curtain unit; normally a grille and/or air inlet opening3.1.9air curtain unit outlet area2summation of open areas through which ai
45、r will discharge out of the air curtain; normally a grille and/or air outlet opening3.1.10reverberant roomenclosure meeting the requirements of Annex A and/or Annex B of ISO 13347-2:20043.1.11standard airair with a density of 1,2 kg/m3Note 1 to entry: Standard air has a ratio of specific heats of 1,
46、4 and a viscosity of 1,815 10-3kg/ms.Note 2 to entry: Air at 16 C dry bulb temperature, 50 % relative humidity, and 100 kPa barometric pressure has these properties, but this is not part of the definition.Note 3 to entry: Air at 20 C dry bulb temperature, 50 % relative humidity, and 101,325 kPa baro
47、metric pressure has these properties, but this is not part of the definition.3.2 Air curtain unit sound power levelsConsidering all possible combinations for installation conditions specified in Clause 4, five different sound power level (LW) descriptions are defined in Table 1, e.g. LW(A,in).Table
48、1 Sound power levelsNumber Suffix Description1 (A,in) free-inlet sound power level, type A installation2 (A,out) free-outlet sound power level; type A installation3 (E,tot)total sound power level; type E installation (includes the contributions from the inlet, outlet, casing, and drive)4 (A,in+cas)
49、free-inlet sound power level plus casing-radiated noise; type A installation5 (A,out+cas) free-outlet sound power level plus casing-radiated noise; type A installationNOTE 1 All of these symbols can be used to indicate levels in one-third octave or octave frequency bands, as well as overall sound power levels and A-weighted sound power levels, provided that the sound power to which the symbols relate is clearly defined.Where noise from the drive can contribute to the noise radiated from
