Re: Data Center AC Issues

[David VanHorn <dvanhorn () cedar net>]

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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