What state of the refrigerant is expected when leaving the third evaporator coil in a system with three compressors?

When discussing the state of refrigerant leaving the third evaporator coil in a system with three compressors, the correct understanding revolves around the typical operation of an evaporator coil in a refrigeration cycle. An evaporator coil is primarily designed to facilitate the vaporization of the refrigerant as it absorbs heat from its surroundings.

As the refrigerant enters the evaporator, it is usually in a low-pressure liquid state. As it circulates through the evaporator coil, it absorbs heat, causing the refrigerant to change from a liquid to a vapor. By the time the refrigerant exits the evaporator coil, it has typically absorbed enough heat to completely vaporize, transitioning into a gaseous state.

Since this particular scenario describes the refrigerant leaving the third evaporator coil, and given that the system incorporates multiple compressors, the refrigerant is expected to be in a superheated vapor state. This phase signifies that the refrigerant has not only turned into a vapor but has also absorbed additional energy beyond its phase change, increasing its temperature further.

Understanding this phase is essential for maintaining efficiency in the refrigeration cycle, as the superheated vapor is then ready to be compressed in the compressors, continuing the cycle effectively.