What does the term "superheat" refer to in a refrigeration system?

The term "superheat" refers specifically to the condition when the temperature of a vapor refrigerant is above its boiling point at a given pressure. In refrigeration systems, once a refrigerant evaporates inside the evaporator, it can continue to absorb heat which increases its temperature above the saturation temperature corresponding to its pressure. This phenomenon is crucial for ensuring that the refrigerant remains in a vapor state before it exits the evaporator and enters the compressor. If the refrigerant were to potentially accumulate in a liquid state, it could lead to compressor damage. Therefore, measuring and managing superheat is essential for maintaining the efficiency and safe operation of refrigeration cycles.

In context, while other options may discuss aspects related to heat in a refrigeration system, they do not accurately capture the definition and significance of "superheat" as it specifically pertains to the condition of a vapor refrigerant.