If the exhaust of the air car is -30C, and the surrounding air is 20C that is a difference of 50C. Has anyone heard of peltier devices, a group of thermocouples bonded to ceramic plates? They produce electricity on a temperature difference, or create a temperature difference when supplied with electricity. It was just an idea of mine that maybe electricity could be supplied by the temperature difference and perhaps reclaim some of the energy required during the compression.
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