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ThermoAnswers - TD15(a 240 Btu(b 259 Btu(c 259 Btu TD16(a...

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Thermodynamics Homework Answers – ME 2124 – Spring 2008 Problem Answer(s) TD1 34.4 furlongs/fortnight TD2 4.99 × 10 8 yen/day 1.13 (a) 30.9 ft/s 2 ; (b) 10 lbf 1.20 29.62 N TD3 Explanation TD4 (a) open, fixed; (b) closed; (c) closed; (d) open, moving TD5 (a) ∆ T = 25 ° C = 25 K. Makes no difference (b) ° C: T 2 / T 1 = 1.833, K: T 2 / T 1 = 1.082. Makes a difference. 1.27 33.39 lbf 1.55 71.6 ° F TD6 (a) 27.9 kg/kgmol; (b) nitrogen, carbon monoxide, or ethylene TD7 (a) 0.00396 lbm; (b) 1275 ° F TD8 (a) 688 m 3 ; (b) 200 m 3 3.87 460 K 3.88 65.4 ft 3 TD9 (a) 7.80 ft 3 , 33,900 ft-lbf; (b) 1.00 ft 3 , 0; (c) Explanation TD10 (a) -1500 kJ; (b) 800 kJ; (c) 0; (d) -243 kJ 2.28 6816 ft-lbf, 8.76 Btu 2.29 80.47 kJ 2.35 0.27 hp, 115 rpm TD11 (a) 12400 Btu (b) 12400 Btu TD12 4.16 s TD13 (a) - 25 Btu (b) 15 Btu 2.71 (a) U 41 = -200 kJ, U 23 = 300 kJ, Q 12 = 0, Q 23 = -1000 kJ, W 34 = 700 kJ (b) Refrigeration cycle (if it is a useful cycle!) 2.74 (a) Sketch (b) 8.28 kJ, power cycle (c) 18.78 kJ (d) -36.9 kJ 2.77 W cycle = 21.54 MJ, Q in = 61.54 MJ

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2.87 (a) 8 kW (b) \$128 TD14 Derivation
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Unformatted text preview: TD15 (a) 240 Btu (b) 259 Btu (c) 259 Btu TD16 (a) 400 Btu (b) 600 Btu 3.100-298 Btu, 24.1 lbf/in 2 3.105 (a) 32.88 kJ (b) 25.15 kJ (c) 27.25 kJ 3.106 (a) -252 kJ/kg, -252 kJ/kg (b) -245 kJ/kg, -245 kJ/kg TD17 (a) 23.4 minutes (b) \$ 0.34 TD18 0.167 qt. hot, 0.333 qt. cold TD19 0.416 kJ TD20 (a) P 2 = 2000 kPa, P 3 = 4000 kPa, P 4 = 2000 kPa (b) ∆ U 12 = 0, ∆ U 23 = 1500 kJ, ∆ U 34 = 0, ∆ U 41 = -1500 kJ (c) Q H = 1386 kJ, W = 693 kJ, η = 50% 3.70 73.7 ° F 3.107 12.1% 4.10 (a) 0.372 kg/s (b) 6.10 cm 2 4.12 (a) 0.989 lbm/s (b) 117.8 ft 3 /min (c) 13.41 ft/s 4.17 (a) 0.44 kg/s (b) 0.361 m 3 /s (c) 1.28 m/s, 1.24 m/s 4.19 1.309 ft/s, 0.738 ft/s TD21 (a) 96 ft/s (b) 76.5 psia 4.27 8.35 e-3 ft 2 4.31 319.6 K 4.34 7.53 kg/s, 0.108 m 2 4.45 669 R TD22 928,000 kg/s, 371 m 2 4.65 1.71 lbm/min, 50 gal 4.68 68 ° F, 4.73 ft 4.71 2.79 kW 4.82 1301.5 K, 10,570 kW...
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ThermoAnswers - TD15(a 240 Btu(b 259 Btu(c 259 Btu TD16(a...

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