this post was submitted on 04 Dec 2023
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It depends on which part of the environment the heat is being exchanged with - if your watercooling system is releasing heat to the ground under your house or a somebody else suggested (which is even more effective) a river next to your house, it's not at all equivalent to air cooling.
Further, the heat storage capacity of a material depends on both the kind of material and its mass, so almost all liquids have a higher heat sforage capacity per unit of volume than air (certainly water does) and solids even more (much more, given their much higher density) so even in the big scheme of things (i.e. were will most of that heat end up in given enough time), even heat released by a watercoolong system to the air will mostly end up in tne Earth's crust and oceans and only a tiny fraction of it will remain in the athmosphere.
Even if the water is used from a river, the heat still gets dissipated into the air from the surface of that river.
So river cooling is still just air cooling with extra steps.
It all makes its way into the cold vacuum of space eventually
As I pointed out further down in my comment, solids and liquids have a much higher heat capacity than air (or in other words, they can absorb a lot more heat before they warm up), so most of the heat dissipated to the river would end up stored in the Earth's Crust and Oceans and very little of it in the Air.