Which component is responsible for compressing refrigerant in a Thermo King unit?

The compressor is the component responsible for compressing refrigerant in a Thermo King unit. In refrigeration cycles, the compressor plays a crucial role by increasing the pressure of the refrigerant vapor, which allows it to flow to the condenser. As the refrigerant is compressed, its temperature rises, enabling it to release heat effectively when it passes through the condenser. This process is essential for the refrigeration cycle to function correctly, as it helps in moving refrigerant through the system and ensuring efficient heat transfer.

The evaporator is involved in absorbing heat from the environment, where the refrigerant evaporates and cools the air or product being refrigerated. The condenser's role is to release the heat absorbed by the refrigerant and condense the vapor back into liquid form. The expansion valve regulates the flow of refrigerant into the evaporator by lowering its pressure, but none of these components perform the compression function. Thus, understanding the specific roles of each component in the system clarifies why the compressor is the correct answer regarding which part compresses the refrigerant.