In an industry, 0.6 kg/s of oil (C p = 2.5 kJ/kg.K) is to be cooled in a counter flow heat exchanger from 110°C to 30°C by the use of water entering at 20°C. The overall heat transfer coefficient is...

In an industry, 0.6 kg/s of oil (C_p
= 2.5 kJ/kg.K) is to be cooled in a counter flow heat exchanger from 110°C to 30°C by the use of water entering at 20°C. The overall heat transfer coefficient is expected to be 1500 W/ m².K. Assume that the exit temperature of water is not to exceed 80°C. Using NTU method calculate (a) the water flow rate, (b) the surface area required and (c) the effectiveness of the exchanger.