Hot oil at 150°C is used to preheat a cold fluid at 30°C in a I:I shell and tube heat exchanger. The exit temperature of the hot oil is 110°C. Heat capacities (product of mass flow rate and specific heat capacity) of both the streams are equal. The heat duly is 2 kW. Under co-current flow conditions, the overall heat transfer resistance (I/UA) is A. 0.4°C/W B. 0.04°C/W C. 0.36°C/W D. 0.036°C/W

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