Measuring power

Jasper jaspermccrea at
Wed Apr 29 13:22:39 BST 2009

2009/4/29 Nick Cleaton <nick at>:
> On Wed, 2009-04-29 at 12:23 +0100, Jasper wrote:
>> 2009/4/29 Nick Cleaton <nick at>:
>> >
>> > One possibility might be to measure the heat output of the servers,
>> > rather than the electricity input.  If you assume that the servers lose
>> > heat mainly by pumping hot air out with fans, you'd need to measure both
>> > the air flow rate and the difference between output air temperature and
>> > input air temperature.
>> Fascinating, but there would be no way of calibrating this, unless you
>> built an identical server room that you could play with.
> Not really.  If you know how much air is being heated up by how many
> degrees each second, you can look up the specific heat capacity of air
> and convert that number to the power in Watts required to perform that
> heating.

My point was that the room would not be a closed system..


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