# HomeworkAnswers3 - 6.27(a Not attached(b 375 K(c-29.17...

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ME 200 Thermodynamics I Spring 2011 Answers to Assigned Homework Problems Lectures 23 through 30 5.59 Minimum power required: 0.445 hp; COP = 3.93 5.63 (a) 4.4 kW; (b) 239.7 K; (c) 0.12 kW SP23 588.5 K 5.78 Not attached 5.84 (a) Possible; (b) Internally reversible; (c) Impossible SP24 (b) W 12 = 236 kJ; Q 12 = 2209 kJ; W 23 = 780 kJ; Q 23 = 0 kJ; W 34 = -122 kJ; Q 34 = -1644 kJ; W 41 = -329 kJ; Q 41 = 0 kJ; (c) 0.256 6.1 (a) 6.6549 kJ/kg-K; (b) 1.303 kJ/kg-K; (c) 4.4468 kJ/kg-K; (d) 5.9734 kJ/kg-K 6.3 (a) -4.9128 kJ/kg-K; (b) +0.4337 kJ/kg-K; (c) +0.97515 kJ/kg-K; (d) -22.163 kJ/kg-K SP25 (a) -0.2347 kJ/kg-K; (c) -61.02 kJ/kg 6.14 (a) -2391.84 kJ; (b) -5.524 kJ/K 6.17 (a) +662.8 kJ/kg; (b) +0.2566 kJ/kg-K SP26 (a) -5.094 kJ/K; (b) 9.148 kJ/K; (c) 4.054 kJ/K
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Unformatted text preview: 6.27 (a) Not attached; (b) 375 K; (c) -29.17 kJ/kg 6.29 (a) 1000 kJ; (b) 50% SP27 (b) -0.7837 kJ/kg-K 6.23 W = 65.6 Btu, Q = 873.3 Btu 6.44 (a) Adiabatic, W 12 = +27.7 Btu/lbm; (b) Heat transfer out of system 6.66 (a) 300 K; (b) 1.5 bar; (c) +0.0566 kJ/K SP28 1.011 kJ/kg-K 6.82 (a) +393.53 kJ/kg; (b) Irreversible 6.84 (a) Not attached; (b) 0.0235 kW/K SP29 (a) -10.09°C; (b) 0.019 kJ/kg-K 6.97 Incorrect, entropy production must be positive 6.110 (a) -131.4 kJ/kg; (b) +3.26 kJ/kg-K 6.115 (a) Not attached; (b) 577.1 kJ/kg; (c) 0.1806 kJ/kg-K (Valve 1), 0.0502 kJ/kg-K (Turbine), 0.7346 kJ/kg-K (Valve 2) SP30 (a) 250 kW; (b) 0.2466 kW/K; (c) 0.2821 kW/K...
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