Most modern Datacenters are liquid (Glycol) cooled. The problem is not with cooling, it's with the power delivery. Most colo environments only offer single phase power. You will need 3-phase power to fire up a 42U rack full of blade servers.
The total kW's delivered on a 3-Phase 208 V 30A power whip is calculated as 208 V x 30A x 1.732 or 10.8 kW of power versus a standard 208 V 30 A whip which only delivers 6.2 kW of power. So the 3-Phase system delivers almost twice or 1.732 times the amount of power that a single phase system delivers.
Incidentally, my company builds systems that will fit up to 96 computer blades in a single rack, and yes, it is tough to find a colo that will offer this power at a resonable rate.
Malcolm, if you need more information, we can take this off line and i will be glad to help you.
CSD
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