Air Conditioning Repair Certification (ETI) Practice Exam

In the vapor-compression refrigeration process, the sequential order of steps is essential to effectively transfer heat from a lower temperature area to a higher temperature area. The correct order starts with compression, wherein a refrigerant gas is compressed, raising both its pressure and temperature. This high-pressure gas then moves into the condensation phase, where it releases heat to the surrounding environment, typically through a condenser, and changes from a gas to a liquid.

Next, the refrigerant enters the expansion phase. Here, it experiences a pressure drop as it passes through an expansion valve, which decreases its pressure and temperature, allowing it to evaporate in the final phase. The refrigerant then absorbs heat from the surrounding environment during the evaporation phase, changing from a liquid back to a gas. This cycle repeats, making vapor-compression refrigeration effective for cooling applications.

This sequence illustrates the continuous flow of the refrigeration cycle, highlighting how energy transfer and phase changes are essential for efficient temperature regulation. Understanding this order is crucial for those pursuing air conditioning repair certification, as it forms the basis of diagnosing and troubleshooting refrigeration systems.