Desiccant dryers or absorption dryers are used to remove water vapour from your compressed air system. Unlike refrigerant air dryers that will reduce the pressure dew point to around +3 ºC, absorption dryers can typically reduce your dew point to -40 ºC and as low as -70 ºC. This means for water vapour to condense into a liquid, the air temperature would have to drop below -40 ºC or -70 ºC respectively. An added benefit to desiccant dry air is that a pressure dewpoint of less than -27 ºC will also prevent the growth of bacteria within the compressed air system.

Selecting the right dryer

When designing a compressed air system, not only is it important to size your air compressor correctly but also your desiccant air dryer. A common mistake is to only look at the flow capacity that a dryer is advertised at. However, pressure and temperature play a vital role when selecting a desiccant air dryer. Most dryer manufacturers advertise their flow rate at 7 bar with an ambient of 25 ºC and a compressed air temperature of 35 ºC. If any of these variables change, then the size of the dryer will be affected. It is important to understand the conditions that your new dryer will operate in, to allow for the correct size to be selected.

Desiccant air dryers come in a variety of sizes and designs. It is important to understand the difference in the various types available, as each dryer type has its advantages and disadvantages. Here at UAP we specialise in the design of compressed air systems and can help you select the best dryer to fit your system and provide the best ROI (Return on investment).

Desiccant Air Dryers

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Heatless Absorption Dryers

Heatless Absorption Dryers providing pressure
dew points of -70°C, -40°C or -20°C
Flow rates up to 34m³/min @ 7barg.
Suitable for all industrial compressed air applications.

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Hybrid Desiccant/Refrigerant Combination Dryers

Energy efficient Hybrid Refrigerant/Desiccant Combination Dryers providing pressure dewpoints of -70C, -40C or -20C
Flow Rates up to 110m³/min @ 7 barg.
Suitable for all industrial compressed air applications.

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Heat Regeneration Absorption Dryers

Energy efficient heat regeneration absorption dryers providing pressure dew-points of -70C, -40C or-20C with Zero Purge
Flow Rates up to 226m³/min @ 7 barg.
Suitable for all industrial compressed air applications.

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Heat of Compression Absorption Dryers

Energy efficient heat of compression absorption dryers providing pressure dewpoints of -70C, -40C or -20C with zero purge.
Flow Rates up to 1000m³/min @ 7barg.
Suitable for all industrial compressed air applications.

Contact one of our experts
We can provide a wide range of energy efficient air compressors to meet with your individual requirements.