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Q4. In a steam plant, using reheat, the turbine receives the steam at a pressure and temperature of 70 bar and 300°C respectively. The steam isentropically expands in the first stage until it is just dry saturated.

The steam then enters the reheater and leaves with an enthalpy of 2907 kJ/kg and an entropy of 6.3935 kJ/kgK and is isentropically expanded in the second stage turbine 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. (3)

(b) Calculate the thermal efficiency. (13)