Assignment 6

# Assignment 6 - Mech Eng 2W04 2014 Thermodynamics ASSIGNMENT...

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Mech. Eng. 2W04, 2014 Thermodynamics Page 1 of 3 ASSIGNMENT # 6 SECOND LAW OF THERMODYNAMICS Due Friday, March. 7 th , 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. 26 & 28. (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. f. You are required to solve all questions. Six randomly chosen questions will only be marked. 1. The data listed below are claimed for a power cycle operating between hot and cold reservoirs at 1000 K and 300 K, respectively. For each case, determine whether the cycle operates reversibly, operates irreversibly, or is impossible . (a) Q H = 600 kJ, W cycle = 300 kJ, Q C = 300 kJ (b) Q H = 400 kJ, W cycle = 280 kJ, Q C = 120 kJ (c) Q H = 700 kJ, W cycle = 300 kJ, Q C = 500 kJ (d) Q H = 800 kJ, W cycle = 600 kJ, Q C = 200 kJ 2. As shown in Figure, a reversible power cycle receives energy Q H by heat transfer from a hot reservoir at T H and rejects energy Q C by heat transfer to a cold reservoir at T C . (a) If T H = 1200 K and T C = 300 K, what is the thermal efficiency? (b) If T H = 500 o C, T C = 20 o C, and W cycle = 1000 kJ, what are Q H and Q C , each in kJ?

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