Water at the rate of 1 kg/s is heated from 35°C to 75°C by oil in a double pipe counter-flow heat exchanger. Oil has a specific heat of 1.9kJ/kgk and it enters the heat exchanger at 110°C and 2.5...

Water at the rate of 1 kg/s is heated from 35°C to 75°C by oil in a double pipe counter-flow heat exchanger. Oil has a specific heat of 1.9kJ/kgk and it enters the heat exchanger at 110°C and 2.5 kg/s. The overall heat exchanger coefficient is 300 W/m2K. Calculate the area of heat exchanger tube.