HomeworkSolutions1

HomeworkSolutions1 - SP8 (b) W 12 = -2.2 kJ (work input), Q...

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Thermodynamics ME 200 – Fall 2011 Numerical Answers to Homework Problems Lectures 1 through 11 1.6 (a) 2500 N; (b) 981 N 1.16 -25.8 ft/s 2 SP1 (a) 5.2 lb f ; (b) 1.03 x 10 -3 m 3 1.21 (a) 14.96 ft 3 /lb, 433.39 ft 3 /lbmol; (b) 33.7 lbf 1.37 127.7 kPa, 20 cm 1.42 P 1 = 150 kPa = 1.48 atm; P 2 = 100 kPa = 0.99 atm SP2 (a) 0.152 m 3 ; (b) 0.151 m 3 1.49 3.06 lb f /in 2 (gage) 1.51 Summer: 526.77˚R, 67.10˚F; Fall: 482.85˚R, 23.18˚F SP3 3463.8 ft 2.7 207,623 kJ; 1,369,200 kJ 2.19 9.54 ft/s 2 SP4 (a) 56,250 kJ; (b) 490,000 kJ; (c) 162.8 m/s 2.34 0.8 ft 3 ; W 12 = -5.92 Btu; W 23 = 0 Btu; W 31 = 11.92 Btu 2.37 20 ohm; 9 kJ 2.42 (- k /2)[( l 2 l o ) 2 – ( l 1 l o ) 2 ]; -20 J SP5 (a) 59.68 kJ/kg; (b) 58.43 kJ/kg 2.28 0.5 m 3 ; -1285.7 kJ 2.29 5.0 bar; 12.59 kJ SP6 (b) W 12 = -5000 kJ, W 23 = 3250 kJ, W 31 = 0 kJ 2.56 gas: W = 4 kJ, Q = 4.25 kJ; piston: W = -2 kJ, Q = 2 kJ 2.57 W A = -900 kJ; Q A = -850 kJ; W B = -230.3 kJ, Q B = -180.3 kJ SP7 (b) 240 kJ; (c) 1210 kJ 2.74 Q 12 = 74 kJ, Q 31 = 22 kJ, U 3 = 540 kJ 2.84 (a) 200 MW; (b) 50 MW (to environment); (c) $56.1 M/year
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Unformatted text preview: SP8 (b) W 12 = -2.2 kJ (work input), Q 12 = 0 kJ; W 23 = +2.85 kJ (work output), Q 23 = +10.2 kJ (heat added); W 34 = +4.23 kJ (work output), Q 34 = 0 kJ; W 41 = 0 kJ, Q 41 = -5.32 kJ (heat rejected); (c) W net = +4.88 kJ => power cycle 3.6 Not attached. 3.8 (a) 6.622 ft 3 /lb; (b) 127.9F; (c) 6.015 ft 3 /lb SP9 (b) 0.467 m 3 ; (c) 0.7704 bar; (d) -94.3 kJ (heat rejected) 3.27 T a = 8C; 0.1673; 0.0414 m 3 3.38 1.18 Btu SP10 (b) -4945.5 kJ (heat rejected); (c) 7 bar, 2599.8 kJ/kg 3.40 (a) v = 0.2675 ft 3 /lb, T = 100.56F; (b) p = 18.85 lb f /in 2 , h = 615.2 Btu/lb; (c) p = 47.60 lb f /in 2 , h = 108.80 Btu/lb 3.43 (a) v = 0.2636 ft 3 /lb; (b) h = 77.24 Btu/lb; (c) u = 624.44 Btu/lb; (d) u = 42.32 Btu/lb; (e) u = 143.14 Btu/lb 3.59 (a) T 1 = 79.17F; (b) P 2 = 174.4 lb f /in2; (c) Q 12 = 2583 Btu SP11 (b) -202 kJ/kg; (c) -1655 kJ/kg...
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HomeworkSolutions1 - SP8 (b) W 12 = -2.2 kJ (work input), Q...

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