Assignment 4

# Assignment 4 - Mech Eng 2W04 2014 Thermodynamics ASSIGNMENT...

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Mech. Eng. 2W04, 2014 Thermodynamics Page 1 of 3 P atm =1 bar Air 0.7 bar N 2 0.2 bar ASSIGNMENT # 4 ENERGY ANALYSIS FOR A CLOSED SYSTEM Due Monday, Feb. 10th, 2014 before 4:00 pm (Drop box # 4 in JHE-307) General instructions: a. This assignment will be worked on through the tutorials of Feb. 5 & 7. (Be prepared) b. Choose one of your peers to be your partner for this assignment, c. Solve the assignment together or solve it separately and check the results with each other, d. Submit just one answer sheet having both of your names, e. The same mark will be given to each one of you. 1. A piston-cylinder device with a set of stops initially contains 0.3 kg of steam at 1.0 MPa and 400°C. The location of the stops corresponds to 60 percent of the initial volume. Now the steam is cooled. Determine the compression work if the final state is (a) 1.0 MPa and 250°C and (b) 500 kPa. (c) Also determine the temperature at the final state in part ( b ). 2. One kg of a fluid expands reversibly according to linear law from 4.2 bar to 1.4 bar. The initial and final volumes are 0.004 m 3 and 0.02 m 3 , respectively. The fluid is then cooled at constant pressure and finally compressed according to a law pV = C back to the initial conditions of 4.2 bar and 0.004 m 3 . Calculate the work done in each process stating whether it is done on or by the fluid and calculate the net work of the cycle. Sketch the cycle on a p-V diagram.

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