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TEST_2_F95 - ME 326 THERMODYNAMICS I Test 2 1(25 A steam...

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ME 326: THERMODYNAMICS I Test 2, October 27, 1995 1) (25%) A steam turbine is being designed that must provide a power output of 100 MW when steam flows through it at a rate of 75.2 kg/s. The exit conditions are required to be P 2 =8 kPa, x 2 =90%. The inlet pressure cannot exceed 5 MPa. What is the minimum inlet steam temperature (°C) that will provide the required power output? SOLUTION: First Law for steady-state, steady flow, with the turbine itself as the CV, and assuming DPE and DKE negligable, Q=0 for adiabatic turbune, gives h e =173.85+0.9x2402.3=2335.9 kJ/kg (Table D.11) From Table D.12, at 5000 kPa, T must be >600°C to achieve this h in .. _______________________________________________ 2) (25%) A 5 m 3 insulated tank is initially perfectly evacuated. It is attached to a valve connected to the lab air line, which provides an unlimited supply of air at P=4 atm and T=25°C. The tank is attached to the lab air line, and the tank is filled with air from the line until the tank pressure just reaches 4 atm. The valve to the air line is then closed. What is the temperature of the air in the tank when the valve is closed (°C)?
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