Question

A 1 shell pass, 4 tube pass shell-and-tube heat exchanger is used to cool therminol 59...

A 1 shell pass, 4 tube pass shell-and-tube heat exchanger is used to cool therminol 59 in a refinery. The therminol 59 enters the tubes at a mass flow rate of 0.87 kg/s and changes in temperature from 93◦C to 49◦C. Water is the other fluid. It enters the shell at a mass flow rate of 1.20 kg/s, and changes in temeperture from 23◦C to 37.1◦C. Determine the following:

(a) (10 pts) The heat transfer between the two fluids

(b) (15 pts) The value of Udirty, if A=23 m2

(c) (10 pts) The fouling thermal resistance, if Uclean=500 W m2·K

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