If a Carnot heat engine is run in reverse, it becomes

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When a Carnot heat engine is run in reverse, it operates as a refrigerator. This is because it extracts heat from a low-temperature reservoir and delivers it to a high-temperature reservoir, which is the opposite of what a heat engine does. The Carnot refrigeration cycle achieves the greatest possible coefficient of performance, similar to how the Carnot heat engine achieves the greatest possible efficiency. It is also important to note that the operation of a Carnot engine in reverse does not violate the second law of thermodynamics.

If a Carnot Heat Engine Is Run in Reverse, It