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Throttling a stream is thermodynamically wasteful because it

  • A.destroys pressure exergy while producing no work
  • B.removes a quantity of heat from the flowing stream
  • C.raises the enthalpy of the stream considerably
  • D.reduces the mass flow rate through the line

Answer: A

The same pressure drop taken through a turbine would deliver work, so the valve discards an opportunity. Enthalpy is unchanged across an ideal throttle, which is precisely why the loss is invisible in an energy balance.

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