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Re: Data Center AC Issues
From: David VanHorn <dvanhorn () cedar net>
Date: Mon, 24 Sep 2001 21:26:16 -0500

At 10:18 PM 9/24/01 -0400, ainman () umich edu wrote:

Can anyone recommend an expert Troubleshooting/Design firm that has
extensive experience with Data Center specifici AC issues?

We have a strange problem (probably with the airflow/vents/arrangements) which
has machines in various locations dying due to heat, when the ambient temp
isn't above 90.

Are you monitoring your line voltage?
I've seen "normal" AC lines, in the US, anywhere from 70-140VAC.
Modern equipment use switcher power supplies, which draw more current as the voltage goes lower.
Heat in the power supply is a function of current squared.
So, as the line voltage goes lower, the equipment gets hotter.
(paradoxical-seeming, ain't it?)

Dave's Engineering Page: http://www.dvanhorn.org

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