EN ISO 5136:2009

Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method (ISO 5136:2003)

Publication date:   Jan 30, 2010

General information

60.60 Standard published   Aug 5, 2009

CEN

CEN/TC 211 Acoustics

European Norm

17.140.20   Noise emitted by machines and equipment | 23.120   Ventilators. Fans. Air-conditioners

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Scope

ISO 5136 specifies a method for testing ducted fans and other air-moving devices to determine the sound power radiated into an anechoically terminated duct on the inlet and/or outlet side of the equipment.
The method is applicable to fans which emit steady, broad-band, narrow-band and discrete-frequency sound and to air temperatures between - 50 °C and + 70 °C. The test duct diameter range is from 0,15 m to 2 m. Test methods for small (d < 0,15 m) and large (d > 2 m) test ducts are described in the informative annexes H and I, respectively.
The maximum mean flow velocity at the microphone head for which the method is suitable, depends on the type of microphone shield used, and is as follows:
foam ball 15 m/s; nose cone 20 m/s; sampling tube 40 m/s.
Above these values the suppression of turbulent pressure fluctuations by the microphone shield may be insufficient.
The method described in ISO 5136 is applicable to a sound source in which a fan is connected to ducts on at least one side. It is also applicable to other fan/attenuator combinations or equipment incorporating fans which can be considered as "black boxes".
Examples of fans and other equipment covered by ISO 5136 are
ducted centrifugal fans, ducted axial flow fans, ducted mixed-flow fans, ducted air-handling units, ducted dust-collection units, ducted air-conditioning units, and ducted furnaces.
ISO 5136 is also applicable to other aerodynamic sources such as boxes, dampers and throttle devices provided that a quiet air flow delivered by an auxiliary fan is available, and the signal-to-noise ratio of sound pressures to turbulent pressure fluctuations in the test duct is at least 6 dB.
It is not applicable to non-ducted fans or equipment.

Related legislation

Legislation related to this standard

98/37/EC

Machinery

2006/42/EC

Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)

Harmonized/Supporting

Life cycle

PREVIOUSLY

WITHDRAWN
EN ISO 5136:2003

NOW

PUBLISHED
EN ISO 5136:2009
60.60 Standard published
Aug 5, 2009

Relations

Adopted from ISO 5136:2003 IDENTICAL