High Pressure Refrigerated Air Dryers

High Pressure Refrigerated air dryers

Working Principle

Refrigeration dryers employ two heat exchangers, one for air-to-air and one for air-to-refrigeration. However, there is also a single Trisab heat exchanger that combines both functions. The compressors used in this type of dryer are usually of the hermetic type and the most common gas used is R-134a. The goal of having two heat exchangers is that the cold outgoing air cools down the hot incoming air and reduces the size of compressor required. At the same time the increase in the temperature of outgoing air prevents re-condensation.

Most manufacturers produce "cycling dryers". These store a cold mass that cools the air when the compressor is OFF. When the refrigeration compressor runs, the large mass takes much longer to cool, so the compressor runs longer, and stays OFF longer. These units operate at lower dew points, typically in the 35–40 °F range. When selected with the optional "cold coalescing filter", these units can deliver compressed air with lower dew points.

Commonly a coalesing prefilter is installed immediately upstream of a refrigerated dryer to remove lubricating oil and other contaminants that have the potential to foul the dryer's heat exchangers.


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BHRD - Series


  • More compact construction
  • Reduced charge of cooling systems
  • Complete system available with prefilteration and final filteration
  • High overloading capabilities
  • Refrigerant R134a,as standard in the entire series
  • Secure operation by performance regulation
  • Secure operation with implemented performance control
  • Improved product handling
  • All components requiring maintenance can easily be accessed from one side
  • Secure operation upto an environmental temperature of +50C
  • Condensate drain provided within the frame work,protection against external mechanical influence
  • Control panel,designed in a proper way,thus giving a better access to the control elements and to the displays
  • Basic version with power control facility
  • High energy reduction of upto 90%
  • Available flow capacity of 15 to 2800 m3/Hr
  • Highly accurate electronic timer.
  • Designed to meet the requirements of ISO 7183.
  • Dried air as per requirements of ISO 8573-1 class 3-3-4.
  • Painted for aesthetic look and additional protection.

Evaporator Unit

  • Tube/Tube , Shell/Tube evaporator unit ensure to produce the required Dew point level

Air to Air Exchangers:

  • Shell and Tube Heat exchanger with moderate Heat handling capacity.


  • Auto Drain Valve for Micro prefilters


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