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You may be going for the concept of entropy (H, Greek upper case eta). It's not that entropic heat is of no 'particular' use. Before the heat flowed to where it is now entropy, it might have been used to do work of some kind. The potential to do work that this heat once had cannot be retrieved. The heat can be collected again, but at a substantial energy cost; perhaps too high a cost to make it practical. The previously lost potential to do work is lost forever.

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