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HW3 - conditions(3 points 2 Hot oil at 120ºC with a flow...

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ME 426 Homework #3 15.10.2009 1. A feed water heater uses a shell-and-tube exchanger with condensing steam in one shell pass at 120ºC. (1) Water enters the tubes at 30ºC and makes four passes to produce an overall heat transfer coefficient of 2000 W/m 2 K. The mass flow rate of the water is 2.5 kg/s and the water exit temperature is 100ºC. Calculate the area of the heat exchanger. (3 points) (2) Suppose that the exchanger has been in service for a long time such that a fouling factor of 0.0002 m 2 K/W is experienced. What would be the exit water temperature under these
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Unformatted text preview: conditions? (3 points) 2. Hot oil at 120ºC with a flow rate of 95 kg/min is used in a shell-and-tube heat exchanger with one shell pass and two tube passes to heat 55 kg/min of water which enters at 30ºC. The surface area of the exchanger is 14 m 2 . Calculate the heat transfer rate and exit temperatures of both fluids if the overall heat transfer coefficient is 250 W/m 2 K. The heat capacity of the oil is 1920 J/kg K. (3 points)...
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