What is the difference between a direct expansion and flooded evaporator?

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.