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Heat Transfer Answers f11
Course: ME 2124, Spring 2011School: Virginia Tech
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Transfer Heat Homework Answers ME 2124 Fall 2011 Problem Answer(s) & a) dT/dx = -280 K/m, Q = 14,000 W/m2 & b) dT/dx = 80 K/m, Q = -4,000 W/m2 HT1 & c) T2 = 110C, Q = -8,000 W/m2 & d) T1 = 60C, Q = 4,000 W/m2 & e) T1 = -20C, Q = -10,000 W/m2 HT2 3.5 3.7 3.8 HT3 HT4 3.11 HT5 HT6 HT7 HT8 HT9 3.13 HT10 3.18 3.23 3.41 3.42 3.45 a) d increasing, b decreasing b) a,e...
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Transfer Heat Homework Answers ME 2124 Fall 2011
Problem Answer(s)
& a) dT/dx = -280 K/m, Q = 14,000 W/m2 & b) dT/dx = 80 K/m, Q = -4,000 W/m2
HT1
& c) T2 = 110C, Q = -8,000 W/m2 & d) T1 = 60C, Q = 4,000 W/m2 & e) T1 = -20C, Q = -10,000 W/m2
HT2 3.5 3.7 3.8 HT3 HT4 3.11 HT5 HT6 HT7 HT8 HT9 3.13 HT10 3.18 3.23 3.41 3.42 3.45
a) d increasing, b decreasing b) a,e higher; c lower; b,d varying c) b added, d removed 21.3 hr 57,600 Btu/hr 209C 36.9 kW 5.41 e26 W 72.6% 1.53 W/m/K 1116F 30.0 W 2.0 minutes a) 35.0 W/m2/K b) Bi = 0.00111 << 1 12.47 minutes 87F 81F 60.7 Btu/hr 9.88 s a) 130F b)56.9 s 9.92 W
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