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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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- Fall '09