# Respostas incropera

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ANSWERS TO END-OF-CHAPTER PROBLEMS Fundamentals of Heat and Mass Transfer (5 th Edition) Introduction to Heat Transfer (4 th Edition) F.P. Incropera And D.P. DeWitt
CHAPTER 1
1.1 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.21 1.22 1.23 1.25 1.27 1.28 1.30 1.31 1.32 1.33 1.34 1.35 1.36 1.37 1.38 1.39 1.40 1.41 1.43 378°C 4312 W, \$4.14/d 0.10 W/m⋅K 8400W 19,600W, 120 W 54 mm 2 16.6 W/m , 35.9 W 375 mm 110.40°C, 110.25°C 1.1°C 2 (a) 9800 W/m 2 2 (a) 1400 W/m ; (b) 18,000 W/m 2 (a) 22.0 W/m ⋅K; (b) 22.12, 0.6 2 2 4570 W/m ⋅K, 65 W/m ⋅K 51.8°C, 3200°C 6.3 m/s 0.35 W, 5.25 W 2.94 W 15 mW 2 6.4 W/m ⋅K 102.5°C 254.7 K 726 W, 547 W (a) 18,400 W; (b) \$6450 3.5% (a) 0.223 W; (b) 3.44 W (a) 8.1 W; (b) 0.23 kg/h 100°C 5 3 2 (a) 0, 144 W, 144 W, 0; 0, 0, 144 W,-144 W; (b) 2.04 × 10 W/m ; (c) 39.0 W/m ⋅K (a) 0.052°C/s; (b) 48.4°C 364 K, 380 K 6380 kWh, \$510 or \$170 (a) 4180 s; (b) 319 K, 359 K; (c) 830 K 3 (a) 0.0181 m /s, 4.7 m/s 840 kW 2 2 (a) 32.5 kW/m , 126 kW/m , 17.6 K/s, 68.4 K/s (a) 104 K/s; (b) 1251 K

1.46 1.47 1.48 1.49 1.50 1.51 1.53 1.54 1.55 1.56 1.59 1.60 1.61 1.62 1.63 1.65 1.66 1.67 1.68 1.69 1.70 1.71

(a) 1950 A 132 J/kg⋅K (a)–0.089 K/s; (b) 439 K -3 (a) 1.41 × 10 kg/s 3.2 h -3 2 2 -3 2 (a) 60.6 × 10 kg/s⋅m , 121 g/m ; (b) 32.3 × 10 kg/s⋅m 49°C -3 3 (a) 7.13 × 10 m /s; (b) 70°C (a) 86.7°C; (b) 47°C (a) 79.1 K; (b) 457 mW 37.9°C (a) 600 K 2 375 W/m ⋅K 2 (a) 5500 W/m ; (b) 87.8°C (a) 5268 W; (b) 41°C 345°C (a) 84°C 214 K, 20.0 mW (a) 190.6 W (a) 153°C 2 (a) 386 W/m ; (b) 27.7°C; (c) 55% (a) 47.0°C or 39.9°C

CHAPTER 2
2.72.8 2.9 2.11 2.12 2.14 2.15 2.17 2.18 2.19 2.22 2.23 2.24 2.25 2.26 2.40 2.41 2.43 (a) 200 K/m, -5000 W/m2 ; (b) 225°C, 6250 W/m2 ; (c) -20°C, -5000 W/m2 ; (d) -85°C, -160 K/m; (e) -30°C, 120 K/m 2 2 2 (a) –280 K/m, 14.0 kW/m ; (b) 80 K/m, -4.0 kW/m ; (c) 110°C, -8.0 kW/m ; (d) 60°C, 4.0 2 2 kW/m ; (e) -20°C, -10.0 kW/m 2 2 2 (a) 2000 K/m, -200 kW/m ; (b) –2000 K/m, 200 kW/m ; (c) 2000 K/m, -200kW/m 0, 60 K/m 100°C, 18.75 W; -40°C, 16.25 W (a) 197 W; (b) 87 W; (c) 8.0 W; (d) 7.3 W; (e) 0.093 W; (f) 0.026 W; (g) 0.69 W 2 2 2 2 2 (a) 593 kW/m ; (b) 151 kW/m ; (c) 33.5 kW/m ; (d) 9.95 kW/m ; (e) 0.88 kW/m ; (f) 3.5 2 kW/m (a) 15.0 W/m⋅K, 400 K; (b) 70.0 W/m⋅K, 380 K (a) 51.9 W/m⋅K, 350 K 765 J/kg⋅K, 36.0 W/m⋅K 5 (a) 0, 0.98 × 10 W/m; (b) 56.8 K/s 5 3 2 (a) 2 × 10 W/m ; (b) 0, 10,000 W/m 2 2 22 (a) 200 W/m , 182 W/m , 18 W/m ; (b) 4.3 W/m ⋅K 5 3 2 2 2 2 5 (b) 2 × 10 W/m ; (c) –2950 W/m , 5050 W/m ; (d) 51 W/m ⋅K, 101 W/m ⋅K; (f) –2 × 10 3 6 2 W/m ; (g) 20°C, 4.94 × 10 J/m 6 3 4 5 2 4 5 2 (a) 10 W/m ; (b) 120°C, 10 K/m, -10 K/m ; (c) 220°C, 10 K/m, -10 K/m ; (d) 220°C, 2 × 4 5 2 10 K/m, -2 × 10 K/m (a) 0.20 m; (b) 0; (c) –144,765 W; (d) 72,380 W, -72,380 W (d) 133°C, 122°C, 133.1°C (d)52.5°C

2.45 2.51 2.53 2.54

(c) 18.0 kW/m , -360 K/m; (d) 8.73 × 10 J/m ; (e) 8.73 × 10 J/m 6 3 5 2 7 2 (a) 1.8 × 10 W/m ; (c) 1.8 × 10 W/m ; (d) 7.77 × 10 J/m (a) 25°C, 35°C; (b) 50°C, 30°C; (c) 86.1°C 8 3 5 2 (b) 3.18 × 10 W/m , 1.59 × 10 W/m

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CHAPTER 3
3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.24 3.253.26 3.27 3.28 3.29 3.30 3.35 3.36 3.37 3.39 3.40 3.41 3.42 3.43 3.44 3.45 3.47 3.48 3.49 3.51 3.52 (a) 7.7°C, 4.9°C 2 (a) 1270 W/m 2 (b) 2830 W/m 2 14.1 W/m 2 2 (a) 996 W/m ⋅K, 0.40%; (b) 14.5 W/m ⋅K, 37.9% (a) 0.553; (b) 22.1°C, 10.8°C; (c) –56.3°C (a) 29.4 W 1.53 W/m⋅K 2 2 40.4 W/m ⋅K, 50.7 W/m ⋅K (b) 86 mm (a) 15 W; (b) 130 W; (c) 76 W (b) 4.2 kW; (c) 0.5% 8 1.3 × 10 J 0.185 K/W 2.13 (b) 64 m, 8,307 kW, 40% (b) 515°C (b) 327°C 2 (a) 34,600 W/m 4 2 3.70 × 10 W/m , 55.6°C (a) 762 W 590 W (a) 83%; (b) 1512 W; 259 W; (c) \$0.68 5.7 W 2 (b) 49°C; (c) 67,200 W/m (a) 0.27 W (b) 5.76 kW (b) 189 W (a) 603 W/m 0.784 m, 0.784 m, 0.025 m 2380 W/m (a) 12.6 W/m; (b) 7.7 W/m (a) 214 mm, 420 W/m (a) 251 W/m; (b) 23.5°C 6 3 (a) 4 W/m, 1.27 × 10 W/m ; (b) 58°C; (c) 37.6°C, 34.8°C 4.5 W/m, 13 mm (b)...