Re: DATACENTER: Cooling and Cost Data for Web Hosting Data Centers

[scott w <scott@digisle.net>]

KVA has the same units as watts (volts * amps), but is written KVA so as
to denote complex power.  complex power = real power + i*imaginary power.
Imaginary in the sense that you use the square root of -1 and that doesn't
exist, so it's an imaginary number represented by i. Here's a sort of
hueristic approach. I haven't followed much of the thread so I hope it
helps.  Got my flame-proof panties on just in case...  ;-)

1.add up the total DC wattage
2.divide total DC Watts by 0.7 (1 divided by the square root of 2 ~= .7)
3.divide by 0.65 to cover for power factor and apparent power correction
(rough estimate)
4.divide by 1000 to get KVA  


scott