WHAT IS AIR DRYER？

The relationship between compressed air and drain

In most factories, air compressors are used as a source of compressed air to power various machines and tools, as well as for applications such as chip-blowing, dewatering, and painting.

Air compressors compress the surrounding air to approximately eight times its original pressure and supply it as compressed air throughout the factory.

Regardless of type, whether piston or screw, when air is compressed, the moisture originally present in the air is also compressed, resulting in water droplets appearing within the compressed air.

Even if visible moisture is removed with a filter, the amount of water in the compressed air remains relatively high compared to the original air. This means that even slight temperature changes can lead to the formation of condensation.
Using compressed air with insufficiently removed moisture (condensate) can lead to various issues. 

The Disadvantages of drain

When compressed air is used for various applications without removing condensate (moisture) beforehand, the following disadvantages can occur:

• Moisture can mix with the equipment and tools using compressed air, leading to rust formation in the internal components and pipes, which can cause malfunctions.

• Water can adhere to products when sprayed, resulting in defective items.

• The quality of painting can deteriorate.

The Role of an Air Dryer

To prevent such issues, it is necessary to reduce the moisture content in compressed air to an appropriate level.

An air filter alone cannot sufficiently remove invisible moisture.

By using an air dryer, the temperature of the compressed air is first lowered to condense and remove the moisture, and then reheated using the original heat, resulting in lower relative humidity and supplying drier air. 

Dew Point and Compressed Air

The compressed air discharged through the air dryer becomes clean air with a reduced dew point, making it safe for use.

In general applications, a refrigerant-type air dryer is used, with a pressure dew point of about 10°C being the standard (for some applications, a dew point of 3°C or 5°C may be preferred).

A dew point of 10°C means that theoretically, no condensate will form as long as the air is not cooled below 10°C.

Additionally, for special applications such as pharmaceuticals, semiconductors, and cosmetics, a lower dew point (between -20°C to -40°C) is required. In these cases, a desiccant dryer is used. 

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