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HomeworkSolutions3

# HomeworkSolutions3 - 6.14(b-2391.84 kJ(c-5.5238 kJ/K 6.17(a...

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Thermodynamics ME 200 – Fall 2011 Numerical Answers to Homework Problems Lectures 21 through 30 5.2 The inventor’s claim is invalid. 5.3 (a) Possible; (b) Possible; (c) Impossible; (d) Indeterminate; (e) Possible; (f) Impossible; (g) Indeterminate SP21 Not attached 5.18 (a) Irreversibly; (b) Reversibly; (c) Irreversibly; (d) Impossible 5.20 (a) 0.75 (75%); (b) Q H = 1610 kJ, Q C = 610 kJ; (c) T H = 790°F; (d) 327°C 5.38 1.99 kg/s SP22 (a) 0.08 kg/s; (b) 67.2 kW 5.55 0.243 kW 5.65 (a) 0.8 kW; (b) 246.7 K SP23 (a) 18.5 kW; (b) 79867 kJ/hr 5.77 (b) q 12 = 1640.07 kJ/kg, w 12 = 190.77 kJ/kg; q 23 = 0 kJ/kg, w 23 = 364.31 kJ/kg; q 34 = -1297.70 kJ/kg, w 34 = -115.03 kJ/kg; q 41 = 0 kJ/kg, w 41 = -97.68 kJ/kg; (c) 0.2088 5.85 (a) 47.7%; (b) 33.3%; (c) 20.0%; (c) 0% SP24 (a) – σ cycle = -0.0069 kJ/kg-K 6.2 (a) 1.54 Btu/lb·°R; (b) 0.43552 Btu/lb·°R; (c) 1.1315 Btu/lb·°R; (d) 1.3903 Btu/lb·°R 6.3 (a) 1430.55 kJ/kg; (b) 7.7622 kJ/kg·K; (c) 0.7649 kJ/kg·K; (d) 1331.94 kJ/kg SP25 (a) -5188.2 kJ; (b) -7.96 kJ/K
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Unformatted text preview: 6.14 (b) -2391.84 kJ; (c) -5.5238 kJ/K 6.17 (a) 662.8 kJ/kg; (b) 0.2566 kJ/kg-K 6.20 Q 12 = 0, W 12 = -254.25 kJ, Q 23 = -301.51 kJ, W 23 = -277.61 kJ SP26 (a) -1.05 kJ/K; (b) 1.33 kJ/K 6.26 (a) 0.2693 bar; (b) W 12 = 121.14 kJ, Q 12 = 59.93 kJ; (c) 0.1478 kJ/K 6.29 1000 kJ/cycle; 0.5 SP27 0.6343 kJ/kg·K 6.23 65.6 Btu; 873.3 Btu 6.46 0.08835 Btu/lb-°R; An adiabatic process is possible. 6.53 σ _dot = -1.5 Btu/s·°R < 0, claim cannot be valid SP28 (a) 0.00645 kJ/kg·K; (b) 0.00989 kJ/kg·K 6.66 (a) 400 K; (b) 3 bar; (c) 0.1274 kJ/K 6.88 (a) Flow is from 1.0 MPa, 320˚C to saturated vapor at 100 kPa; (b) 418.4 kJ/kg SP29 (a) +0.00125 kW/K 6.97 σ _dot/m_dot = -0.202 kJ/kg-K; σ _dot/m_dot cannot be negative. The exit temperature reading cannot be correct. 6.115 (b) 577.1 kJ/kg; (c) valve #1: 0.1806 kJ/kg·K, turbine: 0.0502 kJ/kg·K, valve #2: 0.7346 kJ/kg·K; (d) valve #2, valve #1, turbine SP30 (a) 20.4 MW; (b) 27.2 kW/K (turbine), 0.9177 kW/K (compressor)...
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