(a) In a two-stage carnot heat engine, a quantity of heat | Q1 | is absorbed at a temperature T1 , work | W1 | is done, and a quantity of heat |Q2| is expelled at a lower temperature T2, by the first stage. The second stage absorbs the heat expelled by thefirst, does work |W2|, and expelsa quantity of heat |Q3| at a lower temperature T3 .prove that the efficiency of the combination is (T1 – T3)/T1 . (b) A combination mercury steam turbine takes saturated mercury vapour from a boiler at 469ºC and exhausts it to a condenser at 37.8ºC. Calculate the maximum efficiency of the combination.

Shane Macguire , 9 Years ago

Grade upto college level