Quote:
Originally Posted by RedDevil
The big problem with using exhaust heat to power anything is not so much in aquiring the heat - it is right there - but shedding it on the other side of whatever device you'd use.
As you cannot power anything with just heat. You need a temperature differential...
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There's no heat transfer required with the turbine in the ICE exhaust. It's a bottoming process, solely based on the reduction in pressure across the turbine. The work out through the turbine shaft is equal to the loss of internal energy in the gas as its pressure drops. It cools adiabatically (ideally).
An alternative would be to extend the expansion stroke relative to the compression stroke in the engine and extract the energy from the gas in that way, through the crankshaft i.e. use Atkinson or Miller cycles. Same thing done in a different way.