UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

ISO 5136

Acoustics - Determination of Sound Power Radiated into a Duct by Fans and Other Air-Moving Devices - In-Duct Method

active, Most Current
Buy Now
Organization: ISO
Publication Date: 1 April 2003
Status: active
Page Count: 76
ICS Code (Ventilators. Fans. Air-conditioners): 23.120
ICS Code (Noise emitted by machines and equipment): 17.140.20
scope:

General

This International Standard 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.

NOTE 1 For the sake of brevity, wherever the term "fan" occurs in the text, it means "fan or other air-moving device".

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 (see 3.9) may be insufficient.

It is expected that sound power tests will be conducted in conjunction with airflow performance tests in accordance with ISO 5801. The ducting arrangement will therefore normally incorporate a "star" type flow straightener on the outlet side of the fan which will minimize swirl (see 7.3). Where it is permissible to delete the straightener as, for example, with large fans to installation category C according to ISO 5801:1997, the method is limited to a swirl angle of 15°. (An example of a method for determining the angle of swirl is given in Annex J.)

NOTE 2 The installation categories defined in ISO 5801 imply that the fan is either ducted on the outlet side only (category B), on the inlet side only (category C) or on both sides (category D).

Document History

ISO 5136
April 1, 2003
Acoustics - Determination of Sound Power Radiated into a Duct by Fans and Other Air-Moving Devices - In-Duct Method
General This International Standard 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...
December 15, 1990
Acoustics - Determination of Sound Power Radiated into a Duct by Fans - In-Duct Method
A description is not available for this item.

References

Advertisement