Question: Determine the area required in parallel flow heat exchanger to cool oil from 60C to 30C using water available at 20C. The outlet temperature

Determine the area required in parallel flow heat exchanger to cool oil

Determine the area required in parallel flow heat exchanger to cool oil from 60C to 30C using water available at 20C. The outlet temperature of the water is 26C. The rate of flow of oil is 10 kg/s. The specific heat of the oil is 2200 J/kg K. The overall heat transfer coefficient U = 300 W/m2 K. Compare the area required for a counter flow exchanger. Parallel Flow 60'C AT, = 40 30'C AT, = 4 26'C 20'C Inlet Outlet Q= m, c, (T-T) = 10 x 2200 (60-30) J/s = 6,60,000 w Q =UA (LMTD) 40 - 4 LMTD 15.635C 40 In 6,60,000 = 300 x A x 15.635 A= 140.71 m2 Counter Flow 60C AT, = 34 26C 30C AT, = 10 20C Inlet A Outiet

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