The difference between a flooded evaporator and a direct expansion evaporator is the presence of a low-pressure receiver. A flooded evaporator works in conjunction with a low-pressure receiver which separates gas and liquid refrigerant. In a flooded evaporator, the refrigerant is not fully evaporated and heated, while in a direct expansion evaporator, the refrigerant is fully evaporated and heated at a high temperature.
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