ISO 27327-2:2014
(Main)Fans — Air curtain units — Part 2: Laboratory methods of testing for sound power
Fans — Air curtain units — Part 2: Laboratory methods of testing for sound power
ISO 27327-2:2014 deals with the determination of the 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.
Ventilateurs — Rideaux d'air — Partie 2: Méthodes d'essai en laboratoire des niveaux de puissance acoustique
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Standards Content (Sample)
DRAFT INTERNATIONAL STANDARD ISO/DIS 27327-2
ISO/TC 117 Secretariat: BSI
Voting begins on Voting terminates on
2012-10-01 2013-01-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ ORGANISATION INTERNATIONALE DE NORMALISATION
Fans — Air curtain units —
Part 2:
Laboratory methods of testing for sound power
Ventilateurs — Rideaux d'air —
Partie 2: Méthodes d'essai en laboratoire des niveaux de puissance acoustique
[Revision of first edition (ISO 13347-1:2004, ISO 13347-1:2004/Cor.1:2006, ISO 13347-2:2004 and
ISO 13347-2:2004/Cor.1:2006)]
ICS 17.140.20; 23.120
To expedite distribution, this document is circulated as received from the committee
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publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2012
ISO/DIS 27327-2
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
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Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2012 – All rights reserved
ISO/CD 27327-2
Contents Page
1 Scope . 1
2 Normative References . 1
3 Terms, definitions, symbols and units . 2
3.1 Terms and definitions . 2
3.2 Air curtain unit sound power levels . 3
3.3 Other Symbols . 4
4 Limitations on use . 5
4.1 General . 5
4.2 Noise source . 5
4.3 Character of noise . 5
4.4 Uncertainty . 5
4.5 Quantities to be measured . 5
5 Measurement uncertainty . 5
6 Instrumentation . 7
6.1 General . 7
6.1.1 Microphone . 7
6.1.2 Microphone cable . 7
6.1.3 Sound level meter or other microphone amplifier . 7
6.2 Frequency analyser . 7
6.3 Turbulence screens and windshields . 8
6.3.1 Windshields . 8
6.3.2 Wind-generated false noise . 8
6.4 Reference sound source (RSS) . 8
7 Test procedure . 8
7.1 Comparison method . 8
7.2 Direct method . 8
8 Acoustic environment . 8
8.1 Test environment . 8
8.2 Reverberant room . 9
9 Air curtain unit installation conditions . 9
10 Air curtain unit operating conditions . 9
10.1 General . 9
10.2 Measurement of ambient conditions . 9
10.3 Air curtain unit rotational speed . 9
10.4 Determination of air curtain unit aerodynamic operating point . 9
10.5 Control of air curtain unit operating condition . 9
11 Test set-up . 10
11.1 Set-up categories . 10
11.2 Sound pressure levels . 15
11.2.1 Sound pressure levels, background (L ) . 15
pb
11.2.2 Sound pressure levels, RSS (L ) . 15
pqm
11.2.3 Sound pressure levels, air curtain unit (L ). 15
p
11.3 Aerodynamic performance . 15
11.4 Test conditions . 15
11.5 Mounting methods . 16
11.6 Microphone travel or positions . 17
ISO/CD 27327-2
12 Information to be recorded .19
12.1 General .19
12.2 Air curtain unit under test .19
12.2.1 Description of the air curtain unit under test .19
12.2.2 Operating conditions .19
12.2.3 Mounting conditions .19
12.3 Acoustic environment .19
12.3.1 Description of the test environment and method .19
12.3.2 Acoustical qualification of the test environment .20
12.3.3 Test data .20
12.3.4 Laboratory and instrumentation .20
12.3.5 Location of the air curtain unit in the test environment .20
12.3.6 Additional noise sources .20
12.4 Acoustical data appropriate to the method of test .20
13 Calculations and evaluations .21
13.1 Calculation of one-third octave band levels .21
13.2 Calculation of overall sound power levels .21
13.3 Calculation of A-weighted sound power level .22
13.4 Background corrections .22
13.5 Sound power level, L .23
W
13.6 Evaluation .23
14 Test report .23
14.1 General .23
14.2 Description of test site, arrangement of fan, location of measuring points .24
14.3 Instrumentation used .24
14.4 Subjective assessment of the noise character .24
14.5 Measured values of the noise character .24
Annex A (normative) Effect of rotational speed changes .25
Annex B (normative) Uncertainty analysis.26
B.1 General .26
B.2 Definitions .26
B.3 Uncertainties .26
B.4 Room response .26
B.4.1 Broad-band measurement in a reverberant room .27
B.4.2 Pure tone measur
...
INTERNATIONAL ISO
STANDARD 27327-2
First edition
2014-02-15
Corrected version
2014-03-01
Fans — Air curtain units —
Part 2:
Laboratory methods of testing for
sound power
Ventilateurs — Rideaux d’air —
Partie 2: Méthodes d’essai en laboratoire des niveaux de puissance
acoustique
Reference number
©
ISO 2014
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any 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 ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and units . 2
3.1 Terms and definitions . 2
3.2 Air curtain unit sound power levels . 3
3.3 Other symbols . 3
4 Limitations on use . 4
4.1 General . 4
4.2 Noise source . 5
4.3 Character of noise . 5
4.4 Uncertainty . 5
4.5 Quantities to be measured . 5
5 Measurement uncertainty . 5
6 Instrumentation . 7
6.1 General . 7
6.2 Frequency analyser . 7
6.3 Turbulence screens and windshields . 7
6.4 Reference sound source (RSS) . 8
7 Test procedure . 8
7.1 Comparison method . 8
7.2 Direct method . 8
8 Acoustic environment . 8
8.1 Test environment . 8
8.2 Reverberant room . 8
9 Air curtain unit installation conditions . 9
10 Air curtain unit operating conditions . 9
10.1 General . 9
10.2 Measurement of ambient conditions . 9
10.3 Air curtain unit rotational speed . 9
10.4 Determination of air curtain unit aerodynamic operating point . 9
10.5 Control of air curtain unit operating condition . 9
11 Test setup . 9
11.1 Setup categories . 9
11.2 Sound pressure levels .14
11.3 Aerodynamic performance .15
11.4 Test conditions .15
11.5 Mounting methods .15
11.6 Microphone travel or positions .15
12 Information to be recorded .16
12.1 General .16
12.2 Air curtain unit under test .17
12.3 Acoustic environment .17
12.4 Acoustical data appropriate to the method of test.18
13 Calculations and evaluations .19
13.1 Calculation of one-third octave band levels .19
13.2 Calculation of overall sound power levels .19
13.3 Calculation of A-weighted sound power level .19
13.4 Background corrections .20
13.5 Sound power level, L .20
W
13.6 Evaluation .21
14 Test report .21
14.1 General .21
14.2 Description of test site, arrangement of fan, location of measuring points.21
14.3 Instrumentation used .22
14.4 Subjective assessment of the noise character .22
14.5 Measured values of the noise character .22
Annex A (normative) Effect of rotational speed changes .23
Annex B (normative) Uncertainty analysis .24
Annex C (normative) Calibration of reference sound source.28
Annex D (informative) Filter weighted measurements .30
Annex E (normative) Room qualification for sound sources with broadband sound .31
Annex F (informative) Room qualification for sound sources with pure tones/narrow-
band sound .33
Bibliography .37
iv © ISO 2014 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards 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
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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 particular 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 I
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