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State whether the following is true or false.
The coefficient of performance falls as the temperature difference between the two reservoirs widens.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: D

More work is needed per unit of heat moved as the lift increases, which is why a deep freezer is much less efficient than a chiller. The Carnot expression makes the dependence explicit. Freezer and chiller duties are often split for this reason.

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