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Calculating CFM with a variable speed fan

Forum Overclocking : AMD - Calculating CFM with a variable speed fan

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Anonymous   07-27-2005 at 01:49:18 AM

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

 

is CFM linear? for instance if a 5000 rpm 80CFM fan is run at 2500rpm will
the CFM be 40CFM?

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Anonymous   07-29-2005 at 03:04:28 PM
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Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

 

leadfoot wrote:
> is CFM linear? for instance if a 5000 rpm 80CFM fan is run at 2500rpm
> will the CFM be 40CFM?

Approximately, yes. The approximation getting better as the pressure
difference across the fan goes to zero (with a perfect theoretical fan being
exactly linear).

--
Michael Brown
www.emboss.co.nz : OOS/RSI software and more :)
Add michael@ to emboss.co.nz ---+--- My inbox is always open

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Anonymous   07-30-2005 at 02:23:53 AM
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Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

 

leadfoot wrote:
> is CFM linear? for instance if a 5000 rpm 80CFM fan is run at 2500rpm will
> the CFM be 40CFM?
>
>
If I remember the physics properly (it has been a couple of decades) a
perfect fan will have air flow linear with rotational speed. Rotational
speed is wildly nonlinear with the voltage applied.
--
John McGaw
[Knoxville, TN, USA]
http://johnmcgaw.com

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