Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam

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What does the term "superheat" refer to in an A/C system?

The change in pressure of the refrigerant

The temperature rise of the refrigerant gas as it moves from the evaporator to the compressor

The term "superheat" specifically refers to the temperature rise of the refrigerant gas as it moves from the evaporator to the compressor. This occurs after the refrigerant has absorbed enough heat to change from a liquid to a vapor, and it continues to absorb heat as it passes through the evaporator and into the compressor. The superheat temperature is critical because it ensures that the refrigerant is in the vapor state when entering the compressor, preventing any liquid refrigerant from causing damage.

An appropriate level of superheat also indicates that the evaporator is functioning efficiently, as it ensures that all liquid refrigerant has evaporated and any additional heat absorbed increases the vapor temperature. Properly managing superheat helps maintain the effectiveness of the system and prevents compressor failure due to liquid slugging.

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The amount of refrigerant in the system

The cooling efficiency of the evaporator

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