[quickthrowman]

No they don’t, if you remove evaporative cooling and go to a closed loop system, the coefficient of performance is almost cut in half. The people building data centers will almost invariably choose evaporative cooling because opex is substantially cheaper.

[nomel]

Why is this downvoted? It's a simple fact of physics that's been fully understood for literal centuries, taught in high school [1]. For a given heat exchanger size, evaporative cooling will always win (well, unless it's raining), with drastically lower thermal resistance.

[1] https://en.wikipedia.org/wiki/Specific_heat_capacity

[quickthrowman]

I assume people get upset when they’re told they are wrong, I don’t take it personally.

Thanks for seconding me :)