In a compression system, where is vapor charged?

In a compression system, vapor is charged on the suction side of the compressor. This is because the suction side is where the compressor draws in refrigerant vapor from the evaporator. The purpose of charging vapor at this stage is to ensure that the compressor operates efficiently and can compress the vapor into a high-pressure state for it to circulate through the system.

When vapor is introduced here, it allows for proper cycling of the refrigerant in the system, maintaining the required pressure for effective heat exchange. Other options involve locations where liquid refrigerant is typically charged or that are not suitable for charging vapor directly into the system. The design of the system allows the compressor to compress this vapor into a high-pressure gaseous state which is vital for the cooling process to work effectively.