Physical questions

Ray Muno muno at aem.umn.edu
Wed Jan 15 10:07:11 EST 2003


Liebert has an interesting solution for high density rack cooling. They 
call it RackCooler.

http://www.liebert.com/dynamic/displayproduct.asp?id=1037&cycles=60hz

They are designed to remove 8kW per rack on the exit side, before it enters 
the room allowing the central system the ability to maintain the general 
room temperature and eliminate some of the heat in the "hot aisle". 

On Tue, Jan 14, 2003 at 06:19:42PM -0500, Robert G. Brown wrote:
> On Tue, 14 Jan 2003, Michael Stein wrote:
> 
> > > High density clusters also carry a fire risk of their very own.  One can
> > > easily achieve node densities that consume 2 or 3 thousand watts in a
> > > rack (and with effort, can maybe double that).
> > 
> > I've seen a dual 2.4 GHz Xeon Intel 1U machine measured at 250 W (multiple
> > "burn*" running).  A rack full of these (42 U) really is 10KW.
> 
> Has anyone actually filled a rack with nodes this hot and burned this
> much power, per node, sustained?  Kind of scary, if you have;-)
> 
> A joule is dropping a one kilogram hammer on your finger from 10 cm.
> 
> So 10KW is a one-metric-ton jackhammer, pounding up and down one meter
> once a second, sustained.  With all the cooling fans running, it
> probably sounds like one as well...:-)
> 
> Ouch!
> 
>    rgb
> 
> -- 
> Robert G. Brown	                       http://www.phy.duke.edu/~rgb/
> Duke University Dept. of Physics, Box 90305
> Durham, N.C. 27708-0305
> Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at phy.duke.edu
> 
> 
> 
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 Ray Muno                           http://www.aem.umn.edu/people/staff/muno
 University of Minnesota                          e-mail:   muno at aem.umn.edu
 Aerospace Engineering and Mechanics               Phone:     (612) 625-9531
 110 Union St. S.E.		                     FAX:     (612) 626-1558
 Minneapolis, Mn 55455			

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