Energy in the Engine Exhaust

The maximum amount of energy which an ideal turbine can recover from the exhaust gas of an engine is the same as the additional energy obtainable from an ideal, complete-expansion piston engine. This energy, known as the convertible blowdown energy, is equal to the tail triangle of the p-v diagram. A chart is presented for the quick determination of the convertible blowdown energy for exhaust release pressures between 10 and 1000 psia, exhaust release temperatures between 0 and 4000 F, and altitudes between sea level and 40,000 ft.