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EML4147C Test 1 Fall 2008

# EML4147C Test 1 Fall 2008 - EML 4147C Test 1 Open book...

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EML 4147C Test 1, Open book, closed notes Name ____________________ Page 1 of 6 Circle the closest answer. 1a) What is the thermal resistance due to the stainless steel tube? a) 8.85 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 1b) 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 1c) What is the cold-side overall heat transfer coefficient U c ? a) 230 W/mK b) 215 m 2 K/W c) 0.0689 W/m 2 K d) 14.51 W/m 2 K e) 225 W/m 2 K 2a) What is the log mean temperature difference Δ T lm ? a) 91.72 °C b) 93.18 °C c) 98.65 °C d) 105.83 °C e) 112.27 °C 2b) What is the length of the heat exchanger? a) 0.921 m b) 0.968 m c) 1.23 m d) 1.31 m e) 1.39 m 2c) After 3 years of operation, performance is degraded by fouling on the water side of the exchanger, and the water outlet temperature is only 65 C for the same fluid flow rates and inlet temperatures. What is the new heat transfer rate q ? a) 2010 W b) 2250 W c) 2430 W d) 2660 W e) 2775 W 2d) What is the new outlet temperature of the oil?

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

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