thecarchik writes "In an internal combustion engine, fuel is burned to power the engine, but as a result a lot of heat is also produced. Most of that heat in ordinary vehicles is wasted; but what if you could catch the energy from the heat, turn it into electricity, and use it to increase your fuel efficiency?
If German exhaust system supplier Eberspaecher has its way, some of that currently-wasted heat may go back into powering a steam turbine, that may some day replace the alternator. The concept is simple: water is piped into a housing that surrounds part of the exhaust system. Residual heat from the exhaust vaporizes the water, producing steam that drives a miniature turbine blade. The turbine can then spin a generator, which can either supplement or replace a conventional alternator."
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