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

In summary, the reason dryers are used even though they are closed systems without water is because during the initial gassing process, there is still some water vapor present in the cooling pipework and gas. The drying capsule removes this moisture and keeps it trapped until the system is opened and resealed. If the system is left with water present, it can cause corrosion and blockages.
  • #1
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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  • #2
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.
 
  • #3
Thank you!
Regards
 

1. Why is a dryer necessary in a cooling circuit?

Dryers are essential components in a cooling circuit because they remove moisture from the system. Moisture can lead to the formation of ice, which can block the flow of refrigerant and hinder the cooling process. Additionally, moisture can cause corrosion and damage to the components of the circuit.

2. What is the purpose of a dryer in a refrigerator?

In a refrigerator, the dryer is responsible for removing any moisture that may have entered the cooling circuit during the manufacturing process. It also absorbs any moisture that may have seeped in through the door seals or other openings over time. This helps to maintain the efficiency and longevity of the fridge.

3. Do all cooling circuits need a dryer?

Not all cooling circuits require a dryer. In some cases, the refrigerant itself may have a low moisture content, making a dryer unnecessary. However, for most refrigeration systems, a dryer is a crucial component for maintaining optimal performance and preventing damage.

4. How does a dryer work in a cooling circuit?

A dryer in a cooling circuit typically consists of a desiccant material, such as silica gel or activated alumina, contained in a filter or cartridge. As the refrigerant passes through the dryer, the desiccant absorbs any moisture present, leaving the refrigerant dry and ready to continue the cooling process.

5. How often should a dryer be replaced in a cooling circuit?

The frequency of dryer replacement depends on the specific system and its usage. In general, dryers should be replaced every 2-3 years or as recommended by the manufacturer. It is important to regularly inspect and replace the dryer to ensure the efficient operation of the cooling circuit and prevent any potential issues caused by moisture buildup.

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