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[–] 1 point 2 years ago* (last edited 2 years ago)

There are currently no production heat pumps using the electrocaloric effect to my knowledge. Stirling engine I doubt as well. Either way still classes as refrigeration. In fact a Stirling engine heat pump/refrigerator would still need refrigerant as it needs a working fluid.

Edit: also pretty sure a Stirling engine is an implementation of a carnot engine

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