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All of the following terms are normally dropped when analysing a large industrial heat exchanger EXCEPT

  • A.the potential energy change term itself
  • B.the enthalpy change of each stream
  • C.the shaft work term
  • D.the kinetic energy change

Answer: B

The enthalpy change is the whole point of the device, so it is the one term that must be kept. The other three are genuinely negligible in a shell and tube unit operating at ordinary velocities. Fluid velocities there are a few metres per second at most.

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