A thin walled concentric tube heat exchanger is used to cool engine oil from 160 0C to 60 0C and water, which is available at 25 0C acts as coolant. The oil and water flow rate are each 2 kg/s and the diameter of the inner tube is 0.5m and corresponding value of overall heat transfer coefficient is 250 w/m2k. how long must the heat exchanger accomplished the desired cooling. Cp = 4.187 Kj/kgk and 2.035 kj/kgk.
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A thin-walled concentric tube heat exchanger is used to cool engine oil from 160°C to 60°C and water, which is available at 25°C acts as a coolant. The oil and water flow rates are each 2 kg/s each and the diameter of the inner tube is 0.5 m and the corresponding value of overall heat transfer coefficient is 250 W/m 2 K. How long must the heat exchanger be to accomplish the desired cooling? Take, CP of water= 4.187 kj/kg K CP of engine oil = 2. 035 kj/kg K.
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