Ah, I see. I keep thinking that modern datacenters would looks more like [1], or at least like [2], with direct water cooling. Supermicro servers and even Dell PowerEdge servers now have the direct water cooling option.

OTOH the cooling of the resulting hot water can be evaporative indeed :(

[1]: https://blogs.nvidia.com/blog/blackwell-platform-water-effic...

[2]: https://www.gigabyte.com/Enterprise/DLC-Rack