HT answers - 3.5 21.3 hr 3.7 57,600 Btu/hr 3.8 209 C HT3...

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Heat Transfer Homework Answers – ME 2124 – Spring 2009 Problem Answer(s) HT1 a) dT/dx = -280 K/m, Q = 14,000 W/m 2 b) dT/dx = 80 K/m, Q = -4,000 W/m 2 c) T 2 = 110 ° C, Q = -8,000 W/m 2 d) T 1 = 60 ° C, Q = 4,000 W/m 2 e) T 1 = -20 ° C, Q = -10,000 W/m 2 HT2 a) d increasing, b decreasing b) a,e higher; c lower; b,d varying c) b added, d removed
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Unformatted text preview: 3.5 21.3 hr 3.7 57,600 Btu/hr 3.8 209 C HT3 36.9 kW HT4 5.41 e26 W 3.11 72.6% HT5 2.0 minutes HT6 a) 35.0 W/m 2 /K b) Bi = 0.00111 << 1 HT7 12.47 minutes HT8 1.53 W/m/K HT9 1116 F HT10 30.0 W 3.13 87 F 3.18 81 F 3.23 60.7 Btu/hr 3.41 9.88 s 3.42 a) 130 F b)56.9 s 3.45 9.92 W...
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