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Q4. In a steam plant, using reheat, the turbine receives the steam at a pressure and temperature of 20 bar and 300°C respectively. The steam isentropically expands in the first stage until it is just dry saturated. It is then reheated at constant pressure to 250°C and is isentropically expanded in the second stage to a condenser pressure of 1 bar.

The feed pump work can be neglected, there is no undercooling in the condenser.

(a) Sketch the T-s diagram for the cycle.

(b) Calculate the thermal efficiency of the process.