The inlet temperature is 16 C and the oil mass flow rate is 100 kg/s.

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Design a shell-and-tube heat exchanger with one shell pass and eight tube passes. The heat exchanger is required to cool mhkg/s of a petroleum oil inside the tubes from 135C to 50C. Water is supplied to the shell at mckg/s and enters at Tc,i. The exchanger should have 200 tubes. The overall heat transfer coefficient is estimated to be 172W/m2K. For the oil, take Cp,h=2200J/kgK and for the water, take Cp,c=4180J/kgK. Neglect heat loss to surroundings, (i) determine the required heat exchanger areas for three water mass flowrates, mc:160kg/s,170kg/s and 180kg/s, respectively, (ii) based on your results, discuss the effect of water flowrate on the required surface area of the heat exchanger