Heat Exchanger - 1.9 kJ/kg ºC. The fluids are used in a...

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ME 426 Homework #1 30.09.2009 1. Hot water flows through a circular tube where ID = 0.0550 m and OD = 0.0630 m. The thermal conductivity of the material is 50 W/m K. The tube surfaces have crust deposits such that fouling factors for inner and outer surfaces are i R = 0.000200 m 2 K/W and o R = 0.000300 m 2 K/W, respectively. The heat transfer coefficients in the inner and outer surfaces of the tube are 4620 W/ m 2 K and 1600 W/ m 2 K, respectively. Calculate the overall heat transfer coefficients based on the outer surface area. 2. Water at the rate of 68 kg/min is heated from 35 to 75ºC by an oil having a specific heat of
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Unformatted text preview: 1.9 kJ/kg ºC. The fluids are used in a counterflow double-pipe heat exchanger, and the oil enters the exchanger at 110ºC and leaves at 75ºC. The overall heat-transfer coefficient is 320 W/m 2 ºC. Calculate the heat-exchanger surface area. 3. Instead of the double-pipe heat exchanger of Problem 2, it is desired to use a shell-and-tube exchanger with the water making two shell passes and the oil making four tube passes. Calculate the area required for this exchanger, assuming that the overall heat-transfer coefficient remains at 320 W/m 2 ºC....
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