What are common sources of moisture in a low pressure refrigeration system?

In a low pressure refrigeration system, one of the primary sources of moisture is from leaking tubes and fittings on the evaporator side. When there are leaks in these areas, humid air can enter the system, leading to moisture accumulation. This moisture can cause various operational issues, including reduced efficiency and potential damage to the system components.

Moisture in the system is particularly problematic as it can lead to the formation of ice or hydrate blockages, leading to refrigeration failure. It also reacts with the refrigerant and lubricants, forming acids that may corrode metal parts of the system and lead to catastrophic failures.

While other factors, like condenser leaks or high ambient temperatures, can contribute to system inefficiencies or pressure issues, the specific introduction of moisture into a low pressure refrigeration system predominantly stems from leaks in the evaporator, where the pressure is lower and the likelihood of pulling in moisture from the environment is higher.