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3. Hot oil at 100C is used to heat air in a shell-and-tube heat exchanger. The oil makes six tube passes, and the air makes

3. Hot oil at 100C is used to heat air in a shell-and-tube heat exchanger. The oil makes six tube passes, and the air makes one shell pass; 2.0 kg/s of air (Cp=1009 J/kgC) are to be heated from 20 to 80C. The specific heat of the oil is 2100 J/kgC, and its flow rate is 3.0 kg/s. Calculate the area required for the heat exchanger for U= 200 W/m2 C

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