After leaving the purge unit of a low-pressure centrifugal system, where does the refrigerant go?

In a low-pressure centrifugal refrigeration system, after the refrigerant exits the purge unit, it goes to the evaporator. The primary function of the evaporator is to absorb heat from the environment, allowing the refrigerant to vaporize and thereby cool the surrounding area. This process happens after the refrigerant has been purified, removing non-condensable gases and moisture that were collected in the purge unit.

The movement from the purge unit to the evaporator ensures that only the clean, vaporized refrigerant continues through the system to effectively absorb heat. This is crucial for the efficiency and operation of the system, as contaminants can hinder performance.

In the context of the other components: the condenser is responsible for rejecting heat and condensing vapor refrigerant back into a liquid, the expansion valve regulates the flow of refrigerant into the evaporator, and the compressor is responsible for increasing the pressure of the refrigerant. After the purge unit, the correct sequence naturally directs the refrigerant to the evaporator, emphasizing its role in the cooling cycle.