An oil cooler is in the form of a single shell 4 tube heatexchanger in which oil passes through the tubes and cool waterpasses through the shell. Water comes in at 15C and leaves at 25Cand has a mass flow rate of 20 kg/min. Oil enters at 35C with amass flow rate of 30 kg/min. Cp of oil is 2.13 kJ/KgCand that of water is 4.18 kJ/kgC. If the surface area of the heatexchanger is 0.5 m2, calculate the overall heat transfercoefficient. Assume the heat exchanger is adiabatic with regards tothe surroundings.
