Refrigerated Air Dryers: What You Need To Know

A refrigerated air dryer is a device that is used to remove moisture from a compressed air system

. If a compressed air system contains moisture, it can run through the hoses and into the equipment, causing damage to the equipment that will cost a lot in repairs. You will need to install a properly sized refrigerated air dryer that you can use with your compressed air system.

The air compressor inlet air filter on the compressed air system is the typical entry point for moisture. A standard air compressor will convert 7 cubic feet of air to 100 psig at 1 cubic foot. Any water vapor that is in the air is also compressed to this size.

Water that is contained in compressed air comes in different forms. This includes liquid water, a mist and a gas or vapor. A general purpose filter can be used with a compressed air system to remove almost all of the liquid water in the system. The remaining water that is in the form of a mist or vapor is removed by using a refrigerated air dryer.

The holding capacity of moisture in air will be reduced by 50 percent when the air temperature drops at 50 degree intervals. The use of a refrigerated air dryer prevents the contamination of equipment located downstream from the air compressor. Water contamination can cause moving parts to fail that may lead to costly repairs.

The use of an air-to-air heat exchanger is used first to cool the compressed air. The heat exchanger for a refrigerated air dryer condenses small amounts of moisture by pre-cooling incoming air. This air is then sent to an air-to-refrigerant exchanger and is cooled even further by using a liquid refrigerant. All of the remaining moisture is condensed into a liquid that is drained out of the system. Air is then heated inside the air-to-air heat exchanger to prevent sweating of the pipe of hose.

When looking for a refrigerated air dryer, an important factor to consider is the pressure dew point. The pressure dew point is the required temperature for water mist or vapor to condense into liquid. The type of pressure dew point class that is commonly used is a Class 4. A test of your equipment is required if a specific pressure dew point needs to be determined. This is needed to calculate your pressure dew point temperature requirements.

by: Bill Fitzell

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