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ME326_HW5_28Sept2011

# ME326_HW5_28Sept2011 - ME 326-Homework Assignment#5 Due 28...

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ME 326-Homework Assignment #5 Due: 28 Sept 2011 Topic: 1 st Law Text: SEH&B Chapter 4 Problem #1: A rigid tank contains a partition the divides the tank into two sections, each having a volume of 2.7 ft 3 . The left side contains 4 lb m of water at a pressure of 25 psia, the right side contains 0.1 lb m of water at 25 psia. The partition is removed and the contents are allowed to mix. Heat transfer occurs with the surroundings until the entire contents of the tank reaches an equilibrium temperature of 300 °F. For this process determine: a) the initial temperature of the left and right sections (°F), b) the final pressure in the tank (psia), c) write an expression for the heat transfer that occurs with the surroundings involving the mass and intensive properties of the system, d) calculate the amount of heat transfer with surroundings (BTU), indicating whether the heat transfer is in or out of the system. Problem #2: A frictionless piston-cylinder apparatus contains 6 kg of air at 50 °C and occupies 1.2 m 3 as shown in the figure below (state 1). Heat is added until the pressure reaches 1.5 MPa, at which point the piston just lifts off the stops (state 2).

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