What is the primary role of the compressor in a refrigeration system?

The primary role of the compressor in a refrigeration system is to increase the pressure of the refrigerant. This process is essential for the refrigeration cycle to function effectively. When the refrigerant enters the compressor as a low-pressure gas, the compressor compresses it, which raises both its pressure and temperature. This pressurized gas then moves on to the condenser, where it can release heat and condense into a liquid.

Increasing the refrigerant pressure is crucial because it allows the refrigerant to flow through the system, enabling it to absorb heat from the environment and facilitate the cooling process. Without the compressor's ability to elevate the refrigerant's pressure, the overall cycle would not function, and heat would not be effectively removed from the space being cooled.

Other options describe important functions within the refrigeration system but do not capture the primary role of the compressor. For instance, while the system does need to circulate the refrigerant, this circulation is specifically enabled by the action of the compressor. Condensing the refrigerant and absorbing heat are functions associated with the condenser and evaporator, respectively, rather than the core purpose of the compressor itself.