fan speed

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fan speed

Postby Craig » Sat May 07, 2005 6:37 am

I have a fan 48 inches in diameter and does 20,000cfm what is that in meters per second
Craig
 
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Re: fan speed

Postby Guest » Sun May 08, 2005 8:56 am

Craig wrote:I have a fan 48 inches in diameter and does 20,000cfm what is that in meters per second


The area of the fan is (pi/4)*(4 ft)^2 = 12.57 sq. ft
If we assume the flow is uniform across the fan opening,
the average velocity is 20000 cfm/12.57 sq. ft. x 1 min/60 s = 26.53 ft/sec
Since 1 foot - 0.3048 m, this is 8.1 m/s
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