2. The below figure provides steady-state operating data for a vapor power plant using water as

the working fluid. The mass flow rate of water is 12 kg/s. The turbine and pump operate

adiabatically but not reversibly (pump and turbine efficiencies are 88%; other assumptions:

problem 1). Determine

(a) the thermal efficiency.

(b) the rates of heat transfer in and Qout, each in kW.

Steam generator

in M

State

1

2

3

4

5

6

P

6 MPa

10 kPa

10 kPa

7.5 MPa

7 MPa

6 MPa

m₁²

Pump

= 12 kg/

T(C)

500

Sat.

---

Turbine

40

550

Condenser

h(KJ/Kg)

3422.2

1633.3

191.83

199.4

167.57

3545.3