BS EN ISO 5136:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Uncertainty of the measurement method
5 Test facilities and instrumentation
6 Test arrangement
7 Test procedure
8 Calculations
9 Information to be recorded
10 Information to be reported
Annex A (normative) - Determination of the combined mean
        flow velocity and modal correction C[3,4]
Annex B (normative) - Determination of the signal-to-noise
        ratio of sound vs. turbulent pressure fluctuation
        in the test duct
Annex C (normative) - Computational procedures for
        calculating the A-weighted sound power level from
        one-third-octave-band sound power levels
Annex D (informative) - Example of calculation of C[3,4] for
        a given duct diameter and mean flow velocity
Annex E (informative) - Guidelines for the design and
        construction of an anechoic termination
Annex F (informative) - Evaluation of performance of
        anechoic terminations
Annex G (informative) - Sampling tube information
Annex H (informative) - Test method for small ducted fans
Annex I (informative) - Test method for large ducted fans
Annex J (informative) - Measurement of the swirl component
Bibliography
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 98/37/EC
Annex ZB (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 2006/42/EC

Describes 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.

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.) NOTE2 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).