Comment by nyrikki
As other have stated, evaporative cooling is most of the usage, AC dries the air and requires adding moisture to the air to prevent problems with static electricity, this drives a much smaller portion of the usage.
Note that evaporative cooling also produces significant amounts of brine, as it is similar to distillation, producing a brine that is difficult to treat and often not useful for other purposes.
With AC can't you just well re-introduce it? The cold side could be almost closed system as nothing demands you to remove water in such location. For occupied spaces lower humidity generally feels better so moisture is removed. But for data centre it could be re-introduced?