Data Center traditionally uses raised floor and in room CRAC units to supply cooling.
Google shared a month ago its hot aisle containment with water heat exchange which is the 5th iteration since 2006.
Google shared its thinking in evaluating heat removal methods.
So should you pump heat or use a fan? Google modeled a 10MW IT load. The fans use 3.85x more energy than a pump!!!
Google found what it had created was so unique they could patent the innovation.