Converting server or computer exhaust heat back to electrical energy is not really feasible for servers/personal computers.
This is because converting heat into electrical energy is a very inefficient process that requires one side of a generator to be extremely high temp and the other be extremely low temp to be able to supply anything with energy.
There is different tech that are capable of converting lower temp heat into electrical energy, but they’re very expensive and take up a ton of space so it wouldn’t be feasible
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