Nope, it doesn't have to be open loop!

Example of such a system being used specifically for datacenters: https://blog.vantage-dc.com/2026/04/22/cooling-without-the-d...

Evaporated water is condensed, and in the process transfers its heat into another place that removes it. Another simple example is a pot of boiling water with a lid on it.

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Eisenstein an hour ago | parent [-]

The link you cited is not evaporative cooling and a pot of boiling water with a sealed lid on it is a pressure vessel which eventually explodes.

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Ductapemaster an hour ago | parent [-]

If you were to remove the heat at a sufficient rate by, say, turning the lid into a heat exchanger, you would have a stable system.

	▲	Eisenstein an hour ago \| parent [-]
		How is that different from not using evaporative cooling and just putting the heat exchanger on the burner?