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Thermo Midterm 2007

Thermo Midterm 2007 - Midterm MAE 221 Thermodynamics...

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Midterm MAE 221 Thermodynamics Wednesday, 24 October 2007 10:00am – 10:50am FC004 Closed Book and Closed Notes Be sure to draw any relevant sketches, list any assumptions and/or simplifications, show all analyses, and be very sure to check dimensions/units of your final answer, along with ascertaining that the sign and rough order-of-magnitude of the answer appears reasonable (and if it doesn’t, please comment accordingly). 1. (40%) A two-phase liquid-vapor mixture of H 2 O, initially at x =30% and a pressure of 100 kPa, is contained in a piston-cylinder assembly, as shown below. The mass of the piston is 10 kg, and its diameter is 15 cm. The pressure of the surroundings is 100 kPa. As the water is heated, the pressure inside the cylinder remains constant until the piston hits the stops. Heat transfer to the water continues at constant volume until the pressure is 150 kPa. Friction between the piston and the cylinder wall and kinetic and potential energy effects are negligible.
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