Oil must be cooled in a heat exchanger from a temperature of 110°C to 30°C at constant pressure (1 atm). The oil has a specific heat of 1.82 kJ/kg-K, and its density is 915 kg/m3. The mass flow rate of the oil is 2.5 kg/s. Design an insulated concentric-tube heat exchanger that will accomplish this task. The velocity of either fluid may not exceed 8 m/s. You may choose the fluid to be used, and its inlet and outlet properties, and you should size the tubes (although the length can be ignored in this design). Consider several possibilities, and choose the design with the lowest entropy generation rate for the heat exchanger.
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