What are two other critical components of a refrigeration system aside from the compressor, condenser, expansion device, and evaporator?

In a refrigeration system, the function of piping and refrigerant is essential for the overall operation. Piping serves as the pathway through which the refrigerant circulates, allowing it to move between various components such as the compressor, condenser, expansion device, and evaporator. This circulation is crucial for the efficient transfer of heat, which is the fundamental principle of refrigeration.

Refrigerant, on the other hand, is the working fluid that absorbs and releases heat during the refrigeration cycle. Its properties allow it to change states between liquid and vapor, facilitating the heat exchange process. The design and selection of both the piping system and refrigerant type can significantly influence the efficiency and effectiveness of the refrigeration system.

The other options presented, while they may include components that are part of the refrigeration system, do not encompass these two critical aspects of the system. Piping and refrigerant are foundational for ensuring proper functionality and performance in a refrigeration setup, making them integral parts of the overall system.