Parker Pneumatic
PRD Refrigeration Air Dryers 325-2400 SCFM

Key Features

  • Optimum dewpoint levels for highest system performance
  • Advanced patented design solutions
  • Environmentally friendly refrigerant
  • High reliability, easy to use and maintain
  • Unique 4-in-1 SmartPack heat exchanger
  • Integral drain
  • Extremely low pressure drop design
  • SmartControl energy saving function
  • Excellent dewpoint performances
  • Advanced compliant scroll compressor
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Refrigeration dryers use a set of heat exchangers or a single heat exchanger (with chambers) first to pre-cool the air; second, to refrigerate the air to condense out moisture vapor; and last, to re-heat the air to prevent pipe sweating downstream. 

Direct Expansion dryers are a type of dryer where the compressed air and the refrigerant come into direct contact via the heat exchanger. While reliable and simple to use, they generally require that the unit continue to run regardless of actual compressed air flow through the dryer. Cycling dryers utilize a thermal mass as the means to absorb the heat from the compressed air. By chilling a thermal mass, a refrigerant compressor may turn off in times of low demand thereby saving energy by shutting off the refrigerant compressor. There is, however, an additional heat transfer (the thermal mass), so a small amount of additional cost may or may not offset the amount of money saved by shutting off the compressor.

The use of refrigeration dryers is preferred:

  • In the capacity range of 10 SCFM (17 Nm3/hr) to 2,400 SCFM (4078 Nm3/hr)
  • Inlet temperatures to 120°F (48.9°C)
  • Wide ranges of operating pressures
  • Indoor applications
  • System with fluctuating conditions and demand