The evaporator in the chest freezer is one of the key components in the refrigeration system, responsible for changing the refrigerant from a liquid state to a gas state and keeping the temperature low by absorbing heat from the surrounding environment.
The evaporator is usually located inside the freezer compartment of a freezer, attached to or around the wall of the freezer. This position facilitates direct contact with the air and food in the freezer compartment for effective cooling.
The process of absorbing heat:
The main task of the evaporator is to absorb heat inside the freezer and evaporate the refrigerant from a liquid state into a gas state. As high-pressure liquid refrigerant flows through the evaporator's coils or tubes, it exchanges heat with the air and food inside the freezer. This causes the refrigerant to absorb heat while changing itself from a liquid to a gas.
Phase change of refrigerant:
Within the evaporator, the temperature and pressure of the refrigerant are reduced, causing it to rapidly change from a liquid state to a gas state. This phase change process requires the absorption of a large amount of heat to provide the energy to change the refrigerant from liquid to gas. This heat absorption reduces the surface temperature of the evaporator, thereby achieving a cooling effect on the freezer compartment.
The function of heat sink:
The surface of the evaporator is usually designed with heat sinks, which helps to increase the surface area and improve the efficiency of heat exchange. The presence of the heat sink allows the refrigerant to absorb heat from the surrounding environment more effectively, ensuring that the surface temperature of the evaporator is low enough to maintain the low temperature inside the freezer.
Relationship with expansion valve:
The evaporator cooperates with the expansion valve in the refrigeration system. The function of the expansion valve is to regulate the flow rate and pressure of the refrigerant to ensure that the appropriate amount of refrigerant enters the evaporator. This helps maintain the proper temperature and pressure inside the evaporator to ensure that the refrigerant undergoes a phase change within the evaporator.