What primary role does a compressor serve in a refrigeration cycle?

A compressor plays a vital role in the refrigeration cycle primarily by increasing the refrigerant pressure. When the refrigerant vapor from the evaporator enters the compressor, it is low in pressure and temperature. The compressor functions by drawing this vapor in, compressing it, and then expelling it at a higher pressure.

This increase in pressure raises the temperature of the refrigerant, allowing it to flow through the condenser, where it releases its heat to the outside environment and changes back into a liquid state. This process is essential for maintaining the overall efficiency and effectiveness of the refrigeration cycle, as it enables the refrigerant to absorb heat in the evaporator and then expel it effectively outside the system.

In the context of the other options, while absorbing heat and cooling the evaporator are key functions of different components within the refrigeration circuit, the compressor's primary role remains centered around increasing pressure. Circulating air is also an essential function but is primarily handled by fans and blowers, not the compressor itself.