2009/4/29 Nick Cleaton <n...@cleaton.net>: > On Wed, 2009-04-29 at 12:23 +0100, Jasper wrote: >> 2009/4/29 Nick Cleaton <n...@cleaton.net>: >> >> > >> > 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.. -- Jasper