Lubricating oil used in the gearbox of a 14,000 rpm high-speed blower is recycled continuously through a double pipe counterflow heat exchanger for cooling. The oil will be cooled from 70°C to 40°C at 1000 kg/h using water entering at 28°C. The water temperature at the exit should not exceed 42°C. The specific heat of oil is 2.05 kJ/kg°C, and that of water is 4.17 kJ/kg°C. Calculate the required rate of flow of water. Calculate the overall heat transfer coefficient if the heat exchange area is 3 m2.

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