Question 66Refrigeration & AC - Assistant Engineer

The correct answer is D) Those purge units which discharge very little refrigerant with the air being removed. In a low-pressure centrifugal chiller, a high efficiency purge unit is one that is designed to remove non-condensable gases (such as air) from the refrigerant circuit while minimizing the loss of refrigerant. The key characteristic of a high efficiency purge unit is that it can effectively remove air and other gases while discharging very little of the valuable refrigerant. This is important to maintain system efficiency and minimize refrigerant losses. The other answer choices are incorrect because they do not accurately describe the defining characteristic of a high efficiency purge unit in a low-pressure centrifugal chiller system.