Which sequence correctly represents the order of steps in the vapor-compression process?

The sequence of the vapor-compression process is crucial for understanding how refrigeration and air conditioning systems operate. The correct order begins with compression, where the refrigerant gas is compressed in the compressor, raising its pressure and temperature.

Next is condensation, where the high-pressure gas flows into the condenser coils. Here, the refrigerant releases heat to the surrounding environment and changes from gas to liquid. Following this, the refrigerant passes through the expansion valve, where it expands, which causes a drop in pressure. This expansion results in a cooling effect and prepares the refrigerant for the final step.

Finally, in the vaporization stage, the low-pressure liquid refrigerant absorbs heat as it evaporates, thus cooling the indoor environment. This process repeats continuously as the system operates.

Understanding this proper sequence helps technicians diagnose issues and service HVAC systems effectively, as reversing these stages leads to system inefficiencies or failures.