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About Compressed Air Dryers 

What Are They and Why Use Them

Refrigerated Compressed Air Dryers




SPRF - Standard Compressed Air Dryers

SPTX - Thermal Exchange Cycling Dryers

SPHT - High Inlet Temperature Dryers


All atmospheric air contains some amount of water vapor.  When air is then cooled to saturation point, the vapor will begin to condense into liquid water. The saturation point is the condition where the the air can hold no more water vapor. The temperature at which this occurs is knows as the dew point.

When ambient air is compressed, heat is generated and the air becomes warmer. In industrial compressed air systems, the air is then routed to an aftercooler, and condensation begins to take place.


To remove the condensation, the air then goes into separator which traps the liquid water. The air leaving the aftercooler is typically saturated at the temperature of the discharge, and any additional cooling that occurs as the air is piped further downstream will cause more liquid to condense out of the air. To address this condensation, compressed air dryers are used.

It is important to dry the air and prevent condensation in the air. Many usages of the compressed air are impacted by liquid water being present. Rust and corrosion can occur in the compressed air piping, leading to scale and contamination at point -of -use processes. Processes such as drying operations and painting would see lower quality if water was deposited onto the parts. 

- Brian Bergmann, Application Engineer


The typical advantages of Refrigerated Dryers are-

  1.  – Low initial capital cost

  2.  – Relatively low operating cost

  3.  – Low maintenance costs

Sullivan-Palatek utilizes only environmentally friendly refrigerants. These low or non-ozone depleting products; HFC, have enabled a global transition away from environmentally destructive CFCs. Sullivan-Palatek refrigerated air dryers utilize HFC (R404A) & (R134A) refrigerant. Optional refrigerant types are available, consult your representative for details.


Thermal Exchange Cycling Air Dryer   12-2650 CFM


High Inlet Temperature Dyer

28-155 CFM


Refrigerated Compresses Air Dryer 12-2650 CFM

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AES Series

Energy Savings, Digital Scroll Refrigerated Air Dryer 600 – 10,000 scfm

The AES Series with stainless steel, brazed plate heat exchanger and digital scroll compressor provides unmatched energy efficiency in a refrigerated air dryer. The 4″ color touch screen display provides multiple features, including: ethernet capability to interface into main control system, instant feedback on energy savings, monitor refrigeration suction, discharge pressure, and temperature, instantaneous load, and hours saved.

  • Continuously matches load demand from 10% to 100%

  • ISO 8573.1 Class 4 (38°F/3°C) dew point performance

  • Ambient Air Temperature: 40°F – 120°F (35°F with low ambient protection)

  • Inlet Air Temperature: 40°F – 120°F

  • Operating Pressure: 60 – 232 psig


DHT Series

High Inlet Temperature Refrigerated Air Dryer      20 – 125 scfm

The Aircel DHT Serieshigh inlet temperature refrigerated dryers are perfect for compressors without an after cooler.

  • Accepts inlet temperatures up to 205°F

  • ISO 8573.1 Class 5 (45°F/7°C) dew point performance

  • Ambient Air Temperature: 40°F – 120°F (32°F with low ambient protection)

  • Maximum Inlet Air Temperature: 205°F

  • Maximum Operating Pressure: 200 psig

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