Which component helps prevent corrosion in a refrigeration system?

The moisture drier plays a critical role in preventing corrosion within a refrigeration system. It functions by removing moisture and contaminants from the refrigerant before it circulates through the system. Moisture can lead to the formation of acids when it combines with refrigerants and oils present in the system, which can corrode metal components and lead to system failure. By ensuring that the refrigerant remains dry and free of impurities, the moisture drier helps maintain the integrity of the refrigeration system, thereby extending its lifespan and efficiency.

In contrast, the other components mentioned, while essential for the operation of the refrigeration system, do not serve the same purpose in protecting against corrosion. The evaporator fan is primarily involved in circulating air over the evaporator coil to facilitate heat exchange. The expansion valve regulates the flow of refrigerant into the evaporator, and the compressor is responsible for circulating the refrigerant throughout the system and increasing its pressure. None of these components directly address moisture removal, which is crucial for preventing corrosion.