Use the given values Air as an ideal gas flows through the turbine and heat exchanger arrangement. Steady-state data are given on the figure and on the table. Stray heat transfer and kinetic and potential energy effects can be ignored.

a) Determine the power developed, in Turbine 2

Find the rates of entropy production, each in kW/K, for

1. b) Turbine 1 and
2. c) Heat exchanger
3. d) Which component contributes more to inefficient operation of the overall system? How do you know?

W1 = 10,000 kW W = ? Turbine 1 Turbine 2 P3 = 4.5 bar T = ? T2 = 1100 K TA=980 K PA = 1 bar P2 = 5 bar Air in + 2 1 www twy 3 4 Ti= 1500 K -6 Heat exchanger VT = 1200 K Ts= 1480 K p = 1.35 bar P6 = 1 bar Air in State 1 2 3 4 5 6 units Turbine 1 1100 Turbine 2 980 Heat Exchanger 1480 1200 T K 1500 1369 bar 20 5.0 4.5 1.0 1.35 1.0 h kJ/kg 1635.97 1161.1 1478.28 1023.3 1611.8 1277.8 s kJ/(kg K) 3.44516 3.07732 3.33504 2.94468 3.42892 3.17888 m kg/sec 21.1 21.1 21.1 21.1 20 20