Certified Facility Manager (CFM) Practice Exam

In the vapor compression refrigeration cycle, what is the first action performed on the refrigerant?

1. Condensing

2. Compressing

3. Boiling

4. Cooling

The correct answer is: Boiling

In the vapor compression refrigeration cycle, the first action performed on the refrigerant is boiling. This process occurs within the evaporator where the refrigerant absorbs heat from the ambient environment, causing it to transition from a liquid state to a vapor state. This phase is critical because it allows the refrigerant to absorb thermal energy, which is then used to cool the surrounding area or substance. The goal of this initial boiling action is to maximize the heat absorption before the refrigerant enters the compressor. By ensuring that the refrigerant is fully vaporized, the system enhances efficiency and improves the overall cooling effect. Once the refrigerant vapor collects in the evaporator, it then moves to the compressor for the next phase of the cycle. Understanding the sequence of actions in this cycle is essential as it highlights the importance of heat absorption at the beginning, laying the groundwork for the subsequent processes of compression, condensation, and expansion.