ISO 27327-2:2014

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
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©  International Organization for Standardization, 2012

ISO/DIS 27327-2
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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
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