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EML4147C Test 1 Spring 2008

EML4147C Test 1 Spring 2008 - EML 4147C Test 1 Open book...

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EML 4147C Test 1, Open book, closed notes Name ____________________ Be very careful with units. If the units aren’t right, the answer is not right. 1a) What is the value of q r ? a) 10198 W/m 2 b) 10198 W c) 23481 W/m 2 d) 23481 W e) -23481 W 1b) What is the value of the uncertainty in q r due to the uncertainty in r 2 ? a) 183904 W b) 183904 W/m 2 c) 183.9 W d) 1839 W e) 0.018 W 1c) The uncertainty in q r due to the uncertainty in r 2 is what percent of the total heat transfer rate? a) 18% b) 118% c) 7.8% d) 1.8% e) 3.6% 2a) What is the thermal resistance due to the stainless steel tube? a) 8.351 x 10 -4 W/K b) 0.0017 K/W c) 8.351 x 10 -4 K/W d) 1197.4 W/K d) 0 2b) What is the thermal resistance due to the fouling on the outside of the tube? a) 0.0037 K/W b) 272.3 K/W c) 6.46 x 10 -8 K/W d) 0.141 K/Wm e) 0.159 K/Wm 2c) What is the cold-side overall heat transfer coefficient U c ? a) 228 W/mK b) 218 m 2 K/W c) 0.0689 W/m 2 K d) 14.51 W/m 2 K e) 225 W/m 2 K 3a) Find the effective radiation heat transfer coefficient . a)
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EML4147C Test 1 Spring 2008 - EML 4147C Test 1 Open book...

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