From which part of a double-pipe condenser should purging be done?

Purging a double-pipe condenser is essential for removing any air or non-condensable gases that can negatively impact the efficiency of the system. The correct approach is to perform this process from the top of the condenser, near the gas inlet. This is because non-condensable gases, such as air, tend to rise and accumulate at the highest point of the condenser. By purging from the top, you effectively remove these unwanted gases, allowing for optimal heat exchange and system performance.

This location ensures that as the gases are displaced, they escape properly without causing any disturbance in the refrigerant flow within the condenser. Maintaining the efficiency of the refrigeration cycle depends significantly on ensuring that the condenser operates without interference from air or other gases, which is why purging from the top is the most effective method.