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An energy balance on a steady flow process with no shaft work reduces to

  • A.the heat added equalling the enthalpy change
  • B.the heat added equalling the internal energy change
  • C.the work done equalling the enthalpy change
  • D.the enthalpy of every stream being equal

Answer: A

Flow work is folded into enthalpy, and with no shaft work and negligible velocity terms nothing else remains. This is the form used for nearly every heater, cooler and exchanger calculation. Kinetic and potential terms are dropped as negligible.

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