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You may have missed when I said there could be 3 steps to the cogeneration:
Gas turbines making electricity
Heat recovery makes steam to drive turbines to make more electricity
Then use the low grade heat for heating or cooling buildings.
In a car, the engine could turn a generator to make electricity
Heat recovery makes steam to drive a small turbine to make more electricity
Then use the low grade heat for heating when needed.
So, a plug-in serial hybrid, with a cogeneration unit to charge the batteries and heat the car when needed.
The engine could spin the armature, and the steam turbine could spin the stator in the opposite direction, so there would only need to be one generator.
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