Compressed air contains naturally occurring moisture, which can negatively affect applications that require moisture-free air. Dryers are a common solution for removing moisture content. One of the most popular options is the refrigerated air dryer because of its ability to reach an acceptable dew point in general industrial plant air applications. Refrigerated air dryers operate with a similar principle to domestic refrigerators or home air conditioning systems.
An air-to-air heat exchanger is used to both pre-cool the incoming air, and re-heat the outgoing air as it leaves the dryer. In a non-cycling refrigerated dryer, the refrigerant circulates continuously through the system. In a separate circuit, liquid refrigerant is evaporated in the evaporator, to cool down the warm compressed air. The air is cooled, while the refrigerant gets warmer.
The refrigerant is compressed by a small compressor and cooled again in the condenser. Here are two pictures of the inside of an old refrigerated compressed air dryer. You can see the various parts of the refrigerant circuit with refrigerant compressor and condenser. You can also see the condensate trap with discharge lines.
The evaporator where the refrigerant cools down the compressed air is located at the top of the dryer the whole area at the top is the insulated evaporator. In the background you see the refrigerant circuit of a compressed air dryer. In the middle is the condensate trap with water discharge lines. At the right the condenser with cooling fan.
In the middle you see the refrigerant pipes that go to the evaporator. At the left the condensate trap again. There are basically two types of refrigerated compressed air dryers. Cycling and non-cycling.
The advantage of the cycling dryer is that it will increase or decrease cooling capacity according to air use. This reduces the energy used and saves you money. The non-cycling is the most common type and is extremely reliable and have the lowest maintenance costs. Example of a refrigerated compressed air dryer.
Absorb means the material that attracts the moisture is dissolved in and used up by the moisture. Absorption takes place in a deliquescent desiccant type dryer.
Regenerative desiccant dryers normally are of twin tower construction. One tower dries the air from the compressor while the desiccant in the other tower is being regenerated after the pressure in the tower has been reduced to atmospheric pressure. Regeneration can be accomplished using a time cycle or on demand by measuring the temperature or humidity in the desiccant towers or by measuring the dew point of the air leaving the on-line tower.
In the heatless regenerative desiccant type, no internal or external heaters are used. Heat reactivated regenerative desiccant dryers may have internal or external heat applied by heaters. In the internal type, steam or electricity may be used in heaters embedded in the desiccant bed. The purge air plus normal radiation is used to cool the desiccant bed after regeneration to prevent elevated air temperatures going downstream. In externally heated regenerative desiccant dryers, the purge air is heated to an elevated temperature and then passes through the desiccant bed.
The purge air from the compressed air system can be eliminated if a blower is used for the circulation of heated atmospheric air through the desiccant bed. To protect the desiccant bed from oil contamination from the air compressor, a coalescing filter is required upstream of the dryer.
Download your copy of our guide to adsorption air dryers. The final type of air dryer for your compressor , is the membrane air dryer.
As the name indicates, it runs incoming air over a hygroscopic membrane to rid it of moisture. The air builds up on the membrane until it migrates through to the other side, which is low pressure. A dry gas is then run through, carrying the moisture away for expulsion. They are often a second or even third stage dryer. Membrane air dryers are a popular choice for medical use thanks to the low dew point in a controlled environment resulting in small amounts of high-quality air.
Choosing the right compressed air drying system for your business can be a complicated task. Air dryers. Contact form. Sales and support. This is useful in several sectors and applications.
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And how does it work? In many applications, having dry compressed air is essential. It is paramount to make use of the right air drying system for your air compressor. E-mail: export multiairitalia. Screw Compressors. Belt drive - MSM Series 2. Piston Compressor. Air Dryers. Desiccant dryer - ADS Series 1 to Line filter - 2 to Condensate management.
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