What is the correct sequence of steps in the vapor-compression refrigeration process?

In the vapor-compression refrigeration process, the correct sequence of steps is compression, condensation, expansion, and vaporization.

To understand why this sequence is correct, it’s essential to recognize the functions of each step. The process starts with the compressor, where the refrigerant gas is compressed, increasing its pressure and temperature. This high-pressure, high-temperature gas then moves to the condenser, where it releases heat to the surroundings and changes state from gas to liquid.

Next, the liquid refrigerant undergoes expansion as it passes through an expansion valve. This rapid decrease in pressure allows the refrigerant to cool further, and it enters the evaporator as a low-pressure liquid. Inside the evaporator, the refrigerant absorbs heat from the environment (the space being cooled), causing it to evaporate and convert back into a low-pressure gas. This cycle then repeats as the gas returns to the compressor.

Understanding this sequence is crucial for not only recognizing how refrigeration systems operate but also for troubleshooting and maintenance tasks in A/C systems. Each step plays a vital role in ensuring that the refrigeration cycle efficiently removes heat and maintains the desired temperature in the conditioned space.