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Their efficiency is far less than 100% as indicated by your reverse operation example. It is their Coefficient Of Performance
(COP) that is greater than 1. COP>1 machines produce more energy than what YOU put in by also taking energy from the environment.
Efficiency is Total Energy Out/Total Energy In. COP is Total Energy Out/Energy only YOU put in. That said I still agree with all
you said. I did see an article once where some big rigs replaced there alternator for powering accessories by lining their
exhaust stacks with small TEG's which, when at operating temperature would produce about 1.2KW worth of electricity.

> Cor van de Water wrote:

> ...but nevertheless these are amazing devices
> with efficiency well above 100%."



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