Which component helps prevent moisture and impurities from entering the refrigeration system?

The component that helps prevent moisture and impurities from entering the refrigeration system is the filter drier. Its primary function is to remove contaminants such as moisture and particulate matter from the refrigerant. Moisture in the system can lead to corrosion, freezing at low temperatures, and other issues that can compromise the efficiency and longevity of the refrigeration system. The filter drier typically contains a desiccant that absorbs moisture and a filtration element that traps solid particles, ensuring that only clean, dry refrigerant circulates through the system.

The compressor, while essential for circulating refrigerant and maintaining system pressure, does not filter out moisture or impurities. The muffler's role is to reduce noise produced by the refrigerant flow and does not address contaminants. The expansion valve regulates the flow of refrigerant into the evaporator but does not protect the system from moisture or impurities. Therefore, the filter drier is the specific component designed to maintain the cleanliness and integrity of the refrigeration system.