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Which is NOT any type of vapor compression cycle?

  • A.Cycle with superheated vapor before compression
  • B.Cycle with dry saturated vapor after compression
  • C.Cycle with superheated vapor after compression
  • D.Cycle with wet vapor before compression

Answer: D

The cycle with wet vapour before compression is not a type of vapour compression cycle in the key. In the vapour compression cycle the vapour is compressed in the compressor, and it enters either dry saturated or superheated, and may leave dry saturated or superheated. Compression of wet vapour is avoided because liquid droplets damage the compressor, so it is not a standard cycle, and the other three options are standard types.

Slugging, the entry of liquid into the cylinder, is the damage that wet compression risks, so practical machines are designed to take only dry or superheated vapour.

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