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How to find the length?

A shell and tube heat exchanger is to be designed to heat 2.5 kg/s of water from 15 to 85 C. The heating is to be completed by passing hot hydraulic oil flowing at 2.5 kg/s that is available at 250 C, throughout the shell side of the exchanger. The heat capacity of the oil is 2220 J/(kg - K). If the overall heat transfer coefficient is 350 W/m 2 - K, discourage mine the heat exchanger area, outlet oil temperature, and length of the tubes (thin walled, diameter = 22 mm) required-

(a) For one shell pass, 2 tube passes

(b) For one shell pass, 3 tube passes

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