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For a steady flow compressor with heat loss, the work required is

  • A.equal to the heat rejected alone
  • B.equal to the enthalpy rise alone
  • C.the enthalpy rise plus the heat rejected
  • D.the enthalpy rise minus the heat rejected

Answer: C

Work put in must cover both the rise in enthalpy of the gas and the energy that escapes as heat, so cooling a compressor does not reduce the work unless the compression path itself is changed. Sign conventions cause most of the errors here.

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