Quote:
Originally Posted by stonebreaker
Storing the energy as heat is inefficient. Use the heat from the exhaust to boil water and generate steam to turn a generator and charge batteries. When the batteries are full, turn the gasoline motor off and just run on battery power.
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If heat is needed, storing it makes sense. The secondary steam engine has been an obvious option for a century, but steam engines are only efficient with a much higher temperature difference, so they would dissipate most of any remaining heat.