The Main Types of Compressed Air Dryers

Compressed air dryers significantly reduce the amount of moisture that is contained in ambient air which can ultimately damage your compressed air system. There are 3 main types of compressed air dryers, so we have explained the differences and which applications they are most suited for.

Refrigerated Compressed Air Dryers

The most common choice of compressed air dryer is the refrigerated dryer; they work by lowering the temperature of the ambient air and condensing it. The condensation is then drained off so the moisture is completely extracted and the dry air is reheated. They are available in both cycling and non-cycling, and they are not suitable for water vapour sensitive applications, sub-freezing temperatures or processes that require extremely dry air.

Desiccant Compressed Air Dryers

Desiccant compressed air dryers use a bed of desiccant material, such as silica gel, to adsorb the water vapour from the ambient air. They are available in both heated and heatless options; heated dryers use heat to remove the water vapour from the saturated material whereas heatless use the dry air created by the dryer to do this. Unlike refrigerated dryers, these can be used in subfreezing conditions or if extremely dry air is required.

Membrane Compressed Air Dryers

Finally, membrane compressed air dryers use membrane microtubes to remove the water vapour from the ambient air; as the air travels through these, the moisture gets trapped within the membrane, leaving dry compressed air to be released. Membrane dryers are ideal for when a consistent dew point is required, in freezing temperatures and remote locations due to no power or moving parts.

Water vapour can cause more damage than you realise so it is very important to invest in compressed air drying equipment. If you need more information or advice on which one would best suit your application, get in contact with us today.