Answer: The thermal efficiency of a Rankine Cycle is nothing but the ratio of net work output to the heat input into the boiler.
η = net work output/heat input into the boiler
η = Wnet/Qin
Net work output is given by,
Wnet = Qin-Qout
Also,
Net work can also be calculated by,
Wnet = Wturbine - Wpump
The overall efficiency of the Rankine cycle is given by,
η = power available at the generator terminals/rate of energy released by combustion of fuels.
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