Final answer:
A person is allowed to refill a refrigeration system with refrigerant only if (a) they possess a valid license, ensuring they're qualified to follow necessary safety protocols and handle the refrigerant properly in the complex heat transfer process of the refrigeration cycle.
Step-by-step explanation:
A person may refill a refrigeration system with refrigerant if they have the proper license. This is necessary to ensure the person handling the refrigerant understands the accompanying regulations and safety procedures. Refrigerants are critical components in refrigeration systems that enable the heat transfer process, central to a refrigerator's operation. In a closed-door operation of a refrigerator or freezer, the system works on the principles of heat transfer, work, and conservation of energy.
The evaporator plays a crucial role in the refrigeration cycle by converting liquid refrigerant into gas, which absorbs heat from inside the refrigerator. The compressor then increases the pressure, and as a result, the temperature of this vapor. The resulting high-pressure hot vapor moves to the condenser, where it converts back into a liquid, releasing the absorbed heat to the outside air. The cycle repeats, continuously removing heat from the refrigerator's interior, keeping food cold.