The evaporator is an important part of the four major parts of refrigeration. The low-temperature condensed liquid passes through the evaporator to exchange heat with the outside air, vaporizes and absorbs heat to achieve the effect of refrigeration. The evaporator is mainly composed of two parts, a heating chamber and an evaporation chamber. The heating chamber provides the heat needed for evaporation to the liquid to promote the boiling and vaporization of the liquid; the evaporation chamber completely separates the gas and liquid phases. The vapor generated in the heating chamber contains a large amount of liquid foam. After reaching the evaporation chamber of a larger space, these liquids can be separated from the vapor by self-condensation or defoamer . Usually the demister is located at the top of the evaporation chamber.

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