What is an ideal refrigerator?

(N/A) An ideal refrigerator is a theoretical device that operates on a perfectly reversible cycle (such as the Carnot cycle) to transfer heat from a cold reservoir to a hot reservoir using work input.
In an ideal refrigerator,there are no dissipative effects like friction,turbulence,or heat leakage.
The coefficient of performance $(COP)$ of an ideal refrigerator is given by the formula:
$COP = \frac{T_L}{T_H - T_L}$
where $T_L$ is the temperature of the cold reservoir and $T_H$ is the temperature of the hot reservoir.
It represents the maximum possible efficiency for a given temperature range.