Design a shell-and-tube heat exchanger with one shell pass and eight tube passes. The heat exchanger is required to cool mh kg/s of a petroleum oil inside the tubes from 135 C to 50 C. Water is supplied to the shell at mc kg/s and enters at Tc,i. The exchanger should have 200 tubes. The overall heat transfer coefficient is estimated to be 172 W/m2K. For the oil, take Cp,h = 2200 J/kgK and for the water, take Cp,c = 4180 J/kg*K. Neglect heat loss to surroundings,

1. What is the required heat exchanger areas for three water mass flowrates, mc,: 160 kg/s, 170 kg/s and 180 kg/s, respectively,

2. Based on your results, discuss the effect of water flowrate on the required surface area of the heat exchanger.

The value of Tc,i is 18 C

The value of mh is 100 kg/s