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The coefficient of performance of a refrigerator is defined as

  • A.the heat rejected to the surroundings divided by the work input
  • B.the work input divided by the heat removed
  • C.the temperature ratio between condenser and evaporator
  • D.the heat removed from the cold space divided by the work input

Answer: D

It measures what you want against what you pay for, which is why it exceeds one for a working machine. The second definition belongs to a heat pump, whose coefficient is larger by exactly one. Both describe the same machine viewed from different ends.

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