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Old 08-30-2003, 10:03 AM
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Is there a mathematical way to work out how much cfm a fan is pushing? just curious coz i found some reallllly old fans the otherday and theres no specs at all...

:cheers:

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Old 09-13-2003, 11:07 AM
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there isn't an equation that i know of to compute the cfm, but if there was it'd need to be really complex, taking into account the efficiency of the fan design (angle of the blades) and the rpm.
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Old 09-13-2003, 04:38 PM
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Quote:
Originally Posted by The Evolved One
Is there a mathematical way to work out how much cfm a fan is pushing? just curious coz i found some reallllly old fans the otherday and theres no specs at all...

:cheers:

The Evolved One
Yep with a CRAY and a highly sophisticated modeling system. Much easier to just measure it.

CFM dosn't matter much anyway... It's all bout airspeed BABY :)
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Old 09-13-2003, 05:00 PM
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cfm...isn't that airflow of your computer? If it is...doesn't that really matter? It would also drop the cpu temp about 5 degrees?
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Old 09-13-2003, 05:10 PM
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CFM is a volume/time measuremnt. a large fan can move a higher volume at even a slow speed. Convective cooling in regards to AIR is 99% dependent on two variables. AIRSPEED and AIR TEMPERATURE. Unfortunately fan manufacturers do not measure airspeed as it is not consistant across the diameter of a fan.:(
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Old 09-13-2003, 05:19 PM
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just in case someone doesnt know CFM stands for CubicFeetperMinute.
So X rating in CFM means how many (X) CUBIC FEET (1ft x 1ft x 1ft) can a fan move in 1 minute.
:2cents:
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