Steam at 32 MPa, 520C enters the first stage of a supercritical

reheat cycle including three turbine stages. Steam exiting

the first-stage turbine at pressure p is reheated at constant

pressure to 440C, and steam exiting the second-stage turbine

at 0.5 MPa is reheated at constant pressure to 360C. Each turbine

stage and the pump has an isentropic efficiency of 85%.

The condenser pressure is 8 kPa.

(a) For p  4 MPa, determine the net work per unit mass of

steam flowing, in kJ/kg, and the thermal efficiency.

(b) Plot the quantities of part (a) versus p ranging from 0.5 to

10 MPa.