A double pipe heat exchanger is used to heat water with a mass flow rate of 10 kg/s from 15°C to 33°C. The heating fluid enters at 75°C with a capacity rate of 25 kW/K and the mean overall coefficient...

A double pipe heat exchanger is used to heat water with a mass flow rate of 10 kg/s from 15°C to 33°C. The heating fluid enters at 75°C with a capacity rate of 25 kW/K and the mean overall coefficient of heat transfer is 1570 W/ m².K. Determine the surface areas for counter flow and parallel flow arrangements.