How does the F+ (VSD) dryer work?

A refrigerant dryer uses a refrigerant circuit and heat exchanger(s) to pre-cool air, refrigerate it to condense out moisture vapor, and then re-heat the air to prevent pipe sweating downstream. Refrigerant dryers can lead to a pressure dewpoint (PDP) as low as +3°C/+37.4°F for many applications where there is a need for dry air. They can be used at different pressures and consume no processed compressed air.

In almost every production environment, compressed air flow fluctuates depending on different factors (time of the day, week or even months). In addition to fluctuation of compressed air flow, operational temperatures such as ambient and compressed air temperature may vary. VSD technology allows the F+ VSD dryers not only to save energy at full load, but also to save a significant amount of energy at partial load or under lighter working conditions.

Atlas Copco’s F+ refrigerant dryers

Based on years of experience in the industry, we have chosen to incorporate direct expansion technology with cycling, non-cycling and Variable Speed variants in its range.

Direct expansion dryers without Saver Cycle Control (non-cycling)

• Applications: stable dewpoint, full load applications.
• Key advantage: fixed speed dryers run continuously to ensure a stable dewpoint by design (irrespective of varying load conditions).
• Range: F 330+-850+.

Variable speed dryers (VSD = Variable Speed Drive)

• Applications: varying temperatures, varying flows.
• Key advantage: VSD dryers match the energy consumed to the actual compressed air used. This ensures supreme energy saving as well as a stable dewpoint across the whole spectrum of temperature and flow.
• Range : F 1000+-4170+ VSD.

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