Why cooling circuits, in a fridge for example, need a dryer?

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SUMMARY

Cooling circuits in refrigerators require a dryer to eliminate initial moisture trapped in the gas and pipework before the system is sealed. The dryer utilizes a desiccant that absorbs water vapor, preventing corrosion and blockages caused by freezing. If the sealed system is compromised, a new drying capsule must be installed during the re-gassing process to maintain system integrity and performance. This process is crucial for ensuring efficient coolant flow and preventing damage to the refrigeration components.

PREREQUISITES
  • Understanding of refrigeration cycle principles
  • Knowledge of desiccants and their function in closed systems
  • Familiarity with gas handling and re-gassing procedures
  • Basic concepts of moisture control in HVAC systems
NEXT STEPS
  • Research the types of desiccants used in refrigeration dryers
  • Learn about the refrigeration cycle and its components
  • Explore best practices for re-gassing sealed refrigeration systems
  • Investigate the effects of moisture on coolant flow and system efficiency
USEFUL FOR

Refrigeration technicians, HVAC engineers, and anyone involved in the maintenance and repair of cooling systems will benefit from this discussion.

Charles123
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Since they are closed systems, and do not contain water, why do they use a dryer?
And how does that dryer works? It uses a dissecant? If so does it need to be changed?
 
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The explanation is that it WASN'T a closed system before it was gassed-up.
The cooling pipework, and the actual gas itself initially contains some water vapour.
The drying capsule removes this initial trapped moisture and it remains locked into the dessicant until such time as the sealed system is ruptured, either by a leak or by re-gassing.
At that point, during the resealing process, a new drying caspsule will be installed. Any water in the system would obviously corrode stuff from the inside, but would also no doubt cause problems to the coolant flow, by FREEZING and blocking the system.
 
Thank you!
Regards
 

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