In a dry type evaporator, why must liquid refrigerant boil away as close to the end of the coil as possible?

In a dry type evaporator, it is crucial for the liquid refrigerant to boil away as close to the end of the coil as possible to operate at high efficiency. This ensures that the evaporator is functioning effectively, allowing the refrigerant to absorb as much heat as possible before exiting the coil.

When the refrigerant boils and changes from a liquid to a vapor, it absorbs heat from the surrounding environment, which is vital for the cooling process. If the refrigerant does not boil efficiently or does so too early in the coil, it can lead to a reduction in heat transfer efficiency and negatively impact the cooling capacity of the system.

By ensuring that the refrigerant vaporizes at the end of the coil, the system achieves optimal performance and efficiency, as this allows for maximum heat exchange before the refrigerant exits the evaporator and continues on to the compressor. Therefore, maintaining the correct boiling point and location is essential for maximizing the efficiency of the refrigeration cycle.