Heat Exchange Efficiency: The design of the evaporator directly affects the efficiency of the refrigeration system. Its surface area, piping layout, and materials are key factors. For example, evaporators using copper tubes or aluminum fins can significantly improve heat transfer efficiency because copper has a thermal conductivity as high as 401 W/(m·K), while aluminum has a thermal conductivity of 237 W/(m·K), both far higher than ordinary steel. Furthermore, the fin spacing (typically 1.5-3 mm) and pipe diameter (commonly 6-12 mm) of the evaporator need to be optimized according to the application scenario to balance airflow resistance and heat exchange area. In large cold storage facilities, evaporators may adopt a pipe-type design with a surface area of hundreds of square meters to cope with high-load cooling demands; while in household air conditioners, evaporators are more compact, with a surface area typically between 1 and 5 square meters.
The evaporator is one of the core components of a refrigeration system. Its function is to absorb heat to achieve the "evaporative heat absorption" process in the refrigeration cycle, thereby lowering the ambient temperature or maintaining a low temperature in a specific space. From a technical perspective, the evaporator is filled with a low-temperature, low-pressure liquid refrigerant. When the refrigerant flows through the evaporator's pipes, it exchanges heat with the surrounding air or medium. Because the boiling point of the liquid refrigerant is much lower than the ambient temperature, it rapidly absorbs heat and evaporates into a gaseous state; this process is called "boiling evaporation." By continuously absorbing heat, the evaporator lowers the temperature of the surrounding medium, for example, by reducing indoor air temperature in an air conditioning system or maintaining a low-temperature environment in refrigeration equipment.