The effect of turbine exhaust pressure on the performance of the ideal steam Rankine cycle given in Problem 9.13 with superheat to 300◦C is to be studied. Calculate the thermal efficiency of the cycle and the moisture content of the steam leaving the turbine for turbine exhaust pressures of 5, 10, 50, and 100 kPa. Plot the thermal efficiency versus turbine exhaust pressure for the specified turbine inlet pressure and temperature.

Data from Problem 9.13 

For a nozzle, what is the output and input (source) expressed in exergies?