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Problem
Which expression gives the coefficient of performance (COP) of an ideal Carnot refrigerator working between a cold reservoir at temperature
T
C
T_C
T
C
and a hot reservoir at temperature
T
H
T_H
T
H
? a)
T
H
T
H
−
T
C
\dfrac{T_H}{T_H-T_C}
T
H
−
T
C
T
H
b)
T
C
T
H
−
T
C
\dfrac{T_C}{T_H-T_C}
T
H
−
T
C
T
C
c)
T
H
−
T
C
T
H
\dfrac{T_H-T_C}{T_H}
T
H
T
H
−
T
C
d)
T
H
−
T
C
T
C
\dfrac{T_H-T_C}{T_C}
T
C
T
H
−
T
C
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