To calculate the Carnot coefficient of performance:
Determine the temperature of the hot reservoir (Th) in K or °R.
Determine the temperature of the cold reservoir (Tc) in K or °R.
Use the coefficient of performance formula:
For a reversible refrigerator: COPr = 1/(Th/Tc - 1).
For a reversible heat pump: COPhp = 1/(1 - Tc/Th).
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