Respostas dos problemas do final de cada capítulo Fundamentos de Transferência de Calor e Massa

RESPOSTAS DOS PROBLEMAS DO FINAL DE CADA CAPÍTULO

Fundamentos de Transferência de Calor e Massa (6.ª Edição)

F.P. Incropera

D.P. DeWitt

T.L. Bergman

A.S. Lavine

CAPÍTULO 1

1.1 14,5 W/m2; 58 W

1.2 2667 W

1.3 4312 W; $4,14/d

1.4 0,10 W/(mK)

1.5 8400 W

1.6 19.600 W; 120 W

1.7 54 mm

1.8 16,6 W/m2; 35,9 W

1.9 375 mm

1.10 110,40°C; 110,24°C

1.11 1,1°C

1.12 (a) 9800 W/m2

1.13 (a) 1400 W/m2; (b) 18.000 W/m2

1.14 (a) 22,0 W/(m2K); (b) 22,12; 0,6

1.15 4570 W/(m2K); 65 W/(m2K)

1.16 51,8°C; 3203°C

1.17 6,3 m/s

1.18 0,35 W; 5,25 W

1.19 2,94 W

1.21 15 mW

1.22 6,3 W/(m2K)

1.23 102,5°C

1.25 254,7 K

1.27 0,42; 264 W

1.28 (a) 18.405 W; (b) $6450

1.30 3,5%

1.31 (a) 0,223 W; (b) 3,44 W

1.32 (a) 8,1 W; (b) 0,23 kg/h

1.33 100°C

1.34 (a) 0; 144 W; 144 W; 0; 0; 144 W; 144 W; 0; (b) 2,04105 W/m3; (c) 39,0 W/(m2K)

1.35 (a) 0,052°C/s; (b) 48,4°C

1.36 375 W; 1,8  104 W; 0,065 W

1.37 6380 kWh; $510 ou $170

1.38 (a) 4180 s; (b) 319 K; 359 K; (c) 830 K

1.39 (a) 0,0181 m3/s; 4,7 m/s; (b) 5,97 W

1.40 840 kW

1.41 (a) 32,5 kW/m2; 126 kW/m2; 17,6 K/s; 68,6 K/s

1.43 (a) 104 K/s; (b) 1251 K

CD-40 Respostas dos Problemas do Final de Cada Capítulo

1.46 (a) 1950 A

1.47 132 J/(kgK)

1.48 (a) 0,084 K/s; (b) 439 K

1.49 (a) 1,41103 kg/s

1.50 3,2 h

1.51 (a) 60,6103 kg/(sm2); 121 g/m2; (b) 32,3103 kg/(sm2)

1.53 49°C

1.54 (a) 7,13103 m3/s; (b) 70°C

1.55 (a) 86,7°C; (b) 47°C

1.56 (a) 0,044 K/s; (b) 230 W; 230 W

1.57 (a) 26°C; (b) 4,0  105 /s

1.58 (b) 80°C

1.59 12,2 W/(m2K); 12,2 W/(m2°C)

1.60 (a) 600 K

1.61 375 W/(m2K)

1.62 (a) 5500 W/m2; (b) 87,8°C

1.63 (a) 5268 W; (b) 41°C

1.65 345°C

1.66 (a) 84°C

1.67 214 K; 20,0 mW

1.68 (a) 190,6 W

1.69 (a) 153°C

1.70 (a) 386 W/m2; (b) 27,7°C; (c) 55%

1.71 (a) 47,0°C ou 39,9°C

CAPÍTULO 2

2.8 (a) 280 K/m; 14,0 kW/m2; (b) 80 K/m; 4,0 kW/m2; (c) 110°C; 8,0 kW/m2; (d) 60°C; 4,0

kW/m2; (e) 20°C; 10,0 kW/m2

2.9 (a) 2000 K/m; 200 kW/m2; (b) 2000 K/m; 200 kW/m2; (c) 2000 K/m; 200 kW/m2

2.11 0, 60 K/m

2.12 100°C; 18,75 W; 40°C; 16,25 W

2.14 1010 W; $1050; 151 W; $157; 10,1 W; $10

2.15 (a) 85 W

2.16 14,5 (Btu/(hft2°F))1; 18 (Btu/(hft2°F))1; 18 (Btu/(hft2°F))1

2.17 (a) 15,0 W/(mK); 400 K; (b) 70,0 W/(mK); 380 K

2.18 (b) 5,9  103 W/(mK); (c) 0,74  103 °C; (d) 25,02°C

2.19 765 J/(kgK); 36,0 W/(mK)

2.22 (a) 0; 0,98105 W/m; (b) 56,8 K/s

2.23 (a) 2105 W/m3; (b) 0; 10000 W/m2

2.24 (a) 200 W/m2; 182 W/m2; 18 W/m2; (b) 4,3 W/(m2K)

2.25 (b) 2105 W/m3; (c) 2950 W/m2; 5050 W/m2; (d) 51 W/(m2K); 101 W/(m2K); (f) 2105

W/m3; (g) 20°C; 4,94106 J/m2

2.26 (a) 106 W/m3; (b) 120°C; 104 K/m; 105 K/m2; (c) 220°C; 104 K/m; 105 K/m2; (d) 220°C;

2104 K/m; 2105 K/m2

2.40 (a) 0,20 m; (b) 0; (c) 144.765 W; (d) 72.380 W; 72.380 W

2.41 (d) 133°C; 122°C; 133,1°C

2.43 (d) 52,5°C

Respostas dos Problemas do Final de Cada Capítulo CD-41

2.45 (c) 18,0 kW/m2; 360 K/m; (d) 8,73106 J/m2; (e) 8,73106 J/m2

2.51 (a) 1,8106 W/m3; (c) 1,8105 W/m2; (d) 7,77107 J/m2

2.53 (a) 25°C; 35°C; (b) 50°C; 30°C; (c) 86,1°C

2.54 (b) 3,18108 W/m3; 1,59105 W/m2

CAPÍTULO 3

3.2 (a) 7,7°C; 4,9°C

3.3 (a) 1270 W/m2

3.4