RO
SR EN ISO 5136:2010
Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method (ISO 5136:2003)
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 w
Status :
Valid
Approval date : 1/29/2010
Publish date : 1/31/2010
Number of pages : 76
ICS : 17.140.20 Noise emitted by machines and equipment,23.120 Ventilators. Fans. Air-conditioners
Technical Committee : 274 - Human protection against noise and mechanical vibration
- Replaces SR EN ISO 5136:2003
- Normative reference SR EN 61672-2:2004
- Normative reference SR EN 61260:1997
- Normative reference SR EN 60942:2004
- Normative reference SR EN ISO 266:2003
- Normative reference SR EN ISO 5801:2009