Teaching The Theory And Options For Improving The Efficiency Of Piston Cylinder 1~ Combustion Engines

It is now common practice to use a heat recovery bottoming cycle on internal combustion gas turbines with a resulting 5(Mo increase in power and fuel efficiency. While power is not now typically recovered from the exhaust of piston cylinder engines, a similar but somewhat more complicated potential exists for a comparable increase in power and efkiency. While the exhaust of a gas turbine engine contains availabtity or exergy in the form of elevated temperature, a piston cylinder engine exhaust has availability associated with the surplus pressure at the end of the power stroke along with the resulting elevated temperature. The potential also exists to increase the efficiency of such engines by 50% and the corresponding miles per gallon performance of motor vehicles by 50%. This means a30mpgcar could bea45mpgcar anda65mpgcar could be a 100 mpg car.