COTS cooling

Greg Lindahl lindahl at keyresearch.com
Sun Apr 28 15:16:16 EDT 2002


On Tue, Apr 23, 2002 at 10:00:16PM -0700, Robert B Heckendorn wrote:

> 450W/dualnode * 3.4BTU/hr/W * 400 nodes  = 612K BTU/hr

One thing that I haven't seen anyone point out is that these nodes
won't actually pull 450W in actual operation. However, you also need
to spec enough additional cooling to (1) survive the failure of one of
the AC units, and (2) account for the fact that the efficiency of the
AC units falls over time, by as much as 30%.

greg

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