A shell-and-tube heat exchanger is designed to cool 10000 kg/hr of oil from 150°C to 40°C using cooling water available at 20°C. The specific heat capacity of oil is 2.2 kJ/kg·K and that of water is 4.18 kJ/kg·K. If the overall heat transfer coefficient is 800 W/m²·K, what is the required surface area of the heat exchanger?

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