Consider the two-stage steam turbine with interstage heating shown in the figure. Assume a constant pipe diameter in the heater and assume that the efficiency of each stage is n %.

Additional Stream information is:

P1 = 24 MPa   P2 = 1.5 MPa  P4 = 1.5 MPa P5 = 30 kPa
T1 = 600 C                                 T4 = 360 C
m1 = 12 kg/s    m2 = 2 kg/s

(Note that m is for mass flow rate!)