Why does the compression refrigeration cycle have a high-pressure side?

The presence of a high-pressure side in the compression refrigeration cycle is essential for the efficient operation of the system. When the refrigerant is compressed by the compressor, it is subjected to an increase in pressure, elevating its temperature. This high-pressure, high-temperature refrigerant then moves to the condenser.

In the condenser, the refrigerant releases heat to the surrounding environment and condenses into a liquid. This process is crucial because the refrigerant must operate at a high pressure to ensure it can change states from vapor to liquid effectively. The high pressure also raises the boiling point of the refrigerant, allowing it to remain in a liquid state at elevated temperatures. This functionality directly contributes to the efficiency of the refrigeration cycle, ensuring the refrigerant condenses properly, thus maximizing the cooling effect when it later evaporates on the low-pressure side of the system.

Therefore, the high-pressure side is integral to maintaining the necessary conditions for the refrigerant to condense effectively, making option B the appropriate choice.