I havnt done the math yet to see how loud it may be...I will have to physically measure rpm to do that as it is not shown on the fan....may be 2550 rpm it saya 2550min-1 ???? EBM's german site seems to list fan speeds like that from what I can tell.
3. Acoustic Noise
Cooling electronic systems by air is a common practice throughout the industry. In cases where the system is cooled by forced convection, a blower or a fan is used as the air mover. The size of the air mover is a function of the cooling requirements for the system and the individual components. Associated with the air movers is the acoustic noise that is generated as the result of the air moving within the system. If we look at the sound power level (Lw) for a blower, we can see the role air velocity plays in the noise generated by a blower, (reference 3)
Lw=logh(G / D3N)+2logP+logG+12 (8)
Likewise, LW for the small axial-flow fans is given by the following equation:
Lw=3.71logVt+0.96logG-10.8 (9)
where,
G = the volumetric flowrate
N = the impeller speed in rpm
D = the impeller diameter
P = static pressure drop
Vt = the tip speed of the impeller
Last edited by jlrii; 01-02-2005 at 04:24 PM.
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