5.16 A parallel-flow heat exchanger is utilizing a cold 20% magnesium chloride solution to cool a flow of hexane. The hexane enters the heat exchanger at 30°C and the magnesium chloride solution enters at −20°C. The volumetric flow rates of the hexane and magnesium chloride solution are 25 and 20 L/s, respectively. The heat exchanger has an overall heat transfer coefficient of 1280 W/m2 K. The required heat transfer rate between the fluids is 1100 kW.

Determine the following:

a. Outlet temperature of the hexane (°C)

b. Outlet temperature of the magnesium chloride solution (°C)

c. Required heat transfer area of the heat exchanger (m2)