HW_8 - (c) -29.17 kJ/kg 3) 6.35 (b) 18.1% 4) 6.59 (a) 319.9...

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1) Use thermodynamics tables a. At T=200 o C, and p = 500 kPa, find the specific entropy of nitrogen b. At T=200 o C, and p = 500 kPa, find the specific entropy of water c. Refrigerant 12 expands isothermally from an initial state at p=300kPa, T=40 o C to a final state at p = 150 kPa. Find the change in specific entropy of Refrigerant 12 that occurs in this process. d. Calculate the change in entropy for air between the states p 1 =1 atm, T 1 =50 o C and p 2 =10 atm, T 2 =1000 o C. e. Calculate the change in specific entropy of carbon dioxide as an ideal gas between the state T1 = 820 o F, p1 = 1 amt, T2=77 o F, p2=3 atm. 2) 6.27 (b) 375 K
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Unformatted text preview: (c) -29.17 kJ/kg 3) 6.35 (b) 18.1% 4) 6.59 (a) 319.9 K (b) 1.64 x10-3 kW/K (c) 1.79 x 10-3 kW/K 5) A massless container of fixed volume encloses 1 kg of nitrogen at 1000K. A second similar container encloses 3 kg of argon at Ta <1000 K. Both containers are isolated from the surroundings. The containers are brought together, and there is heat transfer until the containers are in thermal equilibrium. Plot a curve of Sgen, the entropy generation during this process versus Ta. (Here Ta is in the range 100 ≤ Ta ≤ 1000 K. Assume constant specific heats for argon and nitrogen....
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This note was uploaded on 10/28/2009 for the course ENGRD 2210 taught by Professor Torrance during the Fall '08 term at Cornell.

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