A well in insulated heat exchanger is used to heat 4.5 kg/s of water from 20 degrees C to 75 degrees C at a constant pressure. Heat is supplied by 10 kg/s of hot oil (Cp=2.3 kJ/kg K) that enters at 170 degrees C. Oil pressure also constant. No boiling occurs. *a.) What is the heat transfer rate to the water? *b.) What is the rate of entropy production, Sgen? *c.) What is the primary source of irreversibility? d.) sketch and label a T-s diagram for both oil and water. e.) What is the rate of irreversibility of the device, I?
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a) The heat transfer rate to the water = 3,535,844BTU/hr/3413 = 1036KW The outlet temperature of the water = 75 DegC (167 DegF) The outlet temperature of the oil = 127 DegC (260.8DegF)
