Water at a rate of 1.13 kg/s is heated from 35 to 75°C by an oil having a specific heat of 1900 J/kg K. The fluids are used in a counter-flow double-pipe heat exchanger, and the oil enters the exchanger at 110°C at a rate of 2.85 kg/s. The overall heat-transfer coefficient is 320 W/m²K. [Given, Cp,w = 4200 J/kg.K] (20) Calculate the area of the heat-exchanger Determine the outlet temperature of the oil
