Review of Compressed Air Dryers

After so many reviews about airless spray gun, today, we are going to review about Air Dryer. Air Dryer is known as a device for removing water vapor from compressed air. Compresses air dryers are commonly used in Industrial and commercial facilities. So, if you are working in telecomm industry, painting, pneumatic tools, textile manufacturing, pneumatic control systems, or dental Office air, you may need Air dryers to support your work. There are so many types for Air Dryers, but we will be narrowing the types. Below is the explanation of Refrigerated Compresses Air Dryers as further types will be explained in next article.

Refrigerated Compressed Air Dryers

Refrigerated Air Dryers’ dew point range is on 33°F- 39°F (5°C to 3.8°C), this is because most refrigerated air dryers cool the compressed air to a temperature of approximately 35°F to 50°F (1.6°C to 10°C), with this range the pressure dew point falls within limits which are achievable with common refrigeration system controls. This equipment is usually utilized as a mechanical refrigeration system to cool the compressed air and condense water and hydrocarbon vapor. Moreover, refrigerated air dryers are also available in two basic configurations, non-cycling and cycling.

Non-Cycling Compressed Air Dryer

Non-cycling compressed air dryers (fig. AD1-2) cools the compressed air in an air-to-refrigerant heat exchanger (evaporator). The air will be passaged out from two different sides, the warm compressed air flows into one side of the evaporator while low pressure liquid refrigerant is channeled into another side of the evaporator. The temperature of the compressed air is reduced by the refrigerant, the heat from the compressed boiled air. Because it requires a combination of control valves to regulate refrigerant flow as the heat load from the compressed air changes, so the operation of the refrigeration compressor is continuous or non-cycling.

Cycling Compressed Air Dryers

Cycling compressed air dryers (fig. AD1-3) cools the compressed air through an intermediate heat exchanger medium. Propylene glycol is added inside a tank as a safe guard to prevent freezing and corrosion while heat from the water/glycol fluid is removed by the refrigeration system. The cycling process results in significant energy savings up to 50% when compared to equally sized non-cycling designs, so this kind of air dryers provide more benefits than non-cycling one.

More benefits of additional cycling compressed air include:

  • Simple refrigeration circuit as hot gas bypass valves are not allowed
  • Reduction in the required quantity of refrigerant charge up to 60%
  • Additional energy savings because of cycling process.

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