I am no physics guy, but it seems to me if the heat was already created, you lost a chance to more efficiently turn it into electricity before it was turned into heat.
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I’m no physics or chemistry guy either but I know that gas engines need to be kept in a narrow temperature range to avoid creating pollutants that cannot be recombined/destroyed in a catalytic converter,, most of todays engines could be made much more energy efficient if we rolled back pollution controls to the early 1990’s or so and reprogrammed the fuel and ignition curves. Capturing and using the heat created after the fact is the only workable solution I see to creating electricity via induction as he proposed... Think about how inefficient your cars alternator is ,, it makes AC power (which is why it’s called an alternator) and then 1/2 of the wave is discarded using a diode to turn the output to DC..
Just a point of correction about car alternators.
They are three-phase, full-wave rectified alternators, producing six voltage peaks per revolution. None of the six half-waves are “discarded.”