Answer
As reverse Carnot cycle has highest possible COP of a refrigeration cycle or it is a ideal refrigeration cycle. hence we study reverse Carnot cycle to compare COP of the other realistic refrigeration cycle with it.
Work Step by Step
As reverse Carnot cycle has highest possible COP of a refrigeration cycle or it is a ideal refrigeration cycle. hence we study reverse Carnot cycle to compare COP of the other realistic refrigeration cycle with it.