Final answer:
option c,Purging a double-pipe condenser is correctly done at the top near the gas inlet, as non-condensable gases accumulate in this high pressure and temperature area during the condensing process.
Step-by-step explanation:
The process of purging a double-pipe condenser in a refrigeration or heat pump system is essential for removing non-condensable gases, which can reduce the efficiency of the system. The appropriate point for purging is at the highest pressure and temperature area, which is where the non-condensables will accumulate due to their lower density compared to the refrigerant. Therefore, the correct answer to where purging a double-pipe condenser should be done is (C) top, near the gas inlet. This is because it is at this location that the condensing process begins, and non-condensable gases would be most likely to collect as the refrigerant gas transitions to a liquid state.
Purging a double-pipe condenser should be done from the top, near the gas inlet.
In a refrigeration system, the condenser is responsible for transferring heat from the refrigerant gas to the surrounding environment. As the gas flows through the condenser coils, it condenses into a liquid. Purging from the top, near the gas inlet, ensures that any impurities or air bubbles trapped in the condenser are effectively removed.