What happens to the refrigerant in a flooded evaporator compared to a dry expansion evaporator?

In a flooded evaporator system, the design allows for a larger quantity of liquid refrigerant to be present within the evaporator compared to a dry expansion evaporator. In a flooded evaporator, the liquid refrigerant fills a significant portion of the evaporator coil, which means that there is always a substantial amount of liquid refrigerant available to absorb heat. This contrasts with dry expansion evaporators, where the refrigerant is introduced in a way that only a portion of it is in a liquid state at any given time.

This difference in liquid refrigerant levels leads to increased surface area for heat exchange, as the liquid refrigerant can uniformly contact the coil surfaces, thereby maximizing heat transfer. Therefore, the correct answer reflects that more refrigerant is present in liquid form in the flooded evaporator system, enhancing the overall cooling efficiency due to improved heat exchange capabilities.