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SP32-37

# SP32-37 - ME300 Spring 2011 Special Problems SP32 Consider...

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1 ME300 Spring 2011 - Special Problems SP32 Consider the following steam cycle. P 5 = P 6 =P 1 = 120 bar. The turbine inlet temperature T 1 = 740 °C. The working fluid is a saturated liquid at point 7 and at point 4. Both turbine stages are isentropic. The mass flow rate of steam, 1 25 / m kg s . The extraction pressure is P 2 = P 7 = 20.0 bar, and further assume that T 6 = T 7 . The condenser pressure is 0.1 bar. P 3 = P 4 = P 8 = 0.1 bar. Accuracy is important. Interpolate at state 2 to get an accurate value. Include pump work to obtain state 5. a) Draw the T-s diagram for this cycle. b) Compute the steam extracted at point 2, in kg/s. Answers: (b) 7.43 kg/s c) Complete the following table State P [bar] T [C] h [kJ/kg] s [kJ/kg-K] x 1 120.0 740.0 3957.4 7.1746 2 20.0 3 0.1 4 0.1 45.81 191.83 5 120.0 6 120.0 212.4 908.79 7 20.0 212.4 908.79 8 0.1 Trap 8 7 5 4 3 1 6 2 W Q Q

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2 SP33 A steam power plant operates on an ideal cycle as shown in the following figure and provides both power output and heat for a process. Superheated steam with a flow rate of 20 kg/s leaves the boiler at 10.0 MPa and 400 o C. Exactly 2.0 kg/s of steam leaving the
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