[Beowulf] cooling question: cfm per rack?

Andrew Piskorski atp at piskorski.com
Sat Feb 12 13:02:54 PST 2005

On Sat, Feb 12, 2005 at 10:53:47AM -0600, Dean Johnson wrote:
> On Sat, 2005-02-12 at 09:49 -0500, Robert G. Brown wrote:
> > 
> > Relative airflow can probably be measured with a kid's toy -- one of the

> Could you not use one of those cheapish wind speed devices that amateur

> Could you not use one of those cheapish wind speed devices that amateur
> weather folks use? That would give you a rating, presumably in miles per

When I asked Jack Wathey (architect of the Ammonite cluster) about the
small hand-held anemometers intended for hikers and such, what he said

On Wed, Nov 10, 2004 at 10:58:16AM -0800, Jack Wathey wrote:

> What I found most useful was the Kestrel 2000, which measures wind speed 
> and temperature.  The Kestrel 1000 is cheaper ($80 vs $100) and just 
> measures windspeed.  The Kestrel was the only windmeter I could find that 
> was sensitive and accurate enough for measuring the flowrate at ammonite's 
> filters (typically in the 120 to 200 feet per minute range).  They are 
> EXTREMELY DELICATE though! You can wreck the sapphire bearing just by 
> blowing on it hard (yes, I discovered this the hard way).  But the bearing 
> and impeller are replaceable for about $15, so it's not a disaster.
> http://www.kestrelmeters.com

A while back, I purchased one here:


Andrew Piskorski <atp at piskorski.com>

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