[mythtv-users] Cooling data centres (Was: raid array spin down possible?)
linux at thehobsons.co.uk
Tue Sep 27 11:38:29 UTC 2011
Ian Clark wrote:
>I wonder how much energy would be saved if the worlds datacenters just
>operated a few degrees hotter.
Actually, I doubt that either would make a significant difference.
Whilst cooling systems would be very slightly more efficient (higher
Energy Efficiency Ratio) running at a slightly higher indoor
temperature, I don't think this is a particularly great effect in the
grand scheme of things.
Where huge savings can be made is by not "cooling" the datacentre at
all - but instead just use outside air at whatever temperature it
comes in at. In relative terms, blowing outside air in (through
filters) is very cheap compared with active cooling.
We do the latter at work. Our load is about 8kW, and to cool that
with refrigerant based cooling would need something in the order of 2
to 2.5kW to run the chillers. We actually use about 1/10 of that to
run a couple of fans.
>(and stopped cooling dead underfloor
>space, but that's another issue.)
Again, unless you have some very poor insulation it's unlikely to be
an issue. The space under the floors is a convenient and large duct -
so it's really easy to stuff a large volume of air through it. Once
you've cooled down the stuff that's in there (floor supports,
underlying concrete slab, the floor itself), then it doesn't take any
more energy to keep it cool.
As an analogy, if you go and stuff a load of unfrozen food in your
freezer then it takes a lot of effort to get it frozen. Once it is
fully frozen through, then the only energy input need to keep it like
that is to deal with the heat that leaks in through the imperfect
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