Sound power of fans
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Calculation of the noise of a blower or a fan emitted into a duct system or into the ambient air dependent on the type of fan, on the air volume and on the pressure difference.
Lw=A+10*lg(V)+B*lg(D) (Lärmbekämpfung, Kurtze e.a. 1975)
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Air volume (V) [m3/h]
Pressure difference (D) [mbar]
- backward curved blades in duct (A=34, B=18)
- backward curved blades in environment (A=45, B=10)
- forward curved blades in duct (A=24, B=24)
- forward curved blades in environment (A=33, B=18)