Technology Update: Hybrid Dryer
Innovative combined refrigeration/adsorption dryer technology.

CompAir's innovative CDT Series of compressed air dryers from 2.5 to 34 m³/min combines refrigerant and adsorption dryer technology deliver high quality compressed air at low energy consumption levels. This feature contributed by Rastgar & Co. highlights the unique technological combination of the CDT Series, which offers lower energy consumption compared to traditional heatless and heat regenerative adsorption dryer technology.

Energy saving dual drying technology

The CompAir's innovative CDT Series of compressed air dryers from 2.5 to 34 m³/min combines refrigerant and adsorption dryer technology delivering high quality compressed air at low energy consumption levels.

The energy saving solution

The unique technology combination of the CDT Series offers lower energy consumption compared to traditional heatless and heat regenerative adsorption dryer technology.

Where high quality compressed air is key

The major advantage over other compressed air drying technologies is its contribution to energy-efficiency and overall running-cost reduction. Less overall power consumption, less purge-air consumption, constant and stable outlet pressure dew points as well as reduced operating and maintenance costs characterize this new CompAir dryer range.

Two stage drying technology

The unique combination of refrigerant and adsorption drying technology enables high quality compressed air to be provided to the end-user at low energy consumption levels.

In this drying process, untreated humid compressed air is initially confronted by a pre-filter protecting a traditional but modified refrigeration circuit. The majority of the water vapour is effectively removed from the incoming air in this first stage.

The second stage consists of a highly compact desiccant drying stage, protected before and after by high-performance oil/water aerosol and particle removal filters to further reduce the moisture content of the air to a standard dew point of -40°C.  Finally, clean, dry compressed air exits via the patented air/air heat-exchanger to be re-heated and delivered to the air distribution system.

This technology exploiting both PSA (Pressure Swing Adsorption) and TSA (Temperature Swing Adsorption) brings together an effective and economical solution to meet the needs of the compressed air user. With the addition of a dew point dependent switching feature for periods of intermittent load, incorporated into the electronic controller of every CDT dryer, initial investment costs are quickly amortised and life-time costs minimised.

The CDT dryers can be equipped with an optional by-pass to meet the demands of seasonal variations of dew point requirements above zero in summer and below zero in winter. In such cases the dual technology can be operated solely as a refrigeration dryer or regularly in dual combination including adsorption stage.


Installation system.

Combined technology – combined benefits

The unique combined package of refrigeration and adsorption technology offers several advantages of which the most important one is the reduced overall power consumption.

  • Lower operating costs versus traditional heatless and heat regenerative adsorption dryers (lower purge-air requirement and lower heater consumption).
  • Reduced maintenance costs due to less desiccant-fill with extended life time.
  • Reliable pressure dew point without peaks above set-point.
  • Additional savings with seasonal by-pass option.
  • Additional savings at partial load (dew point dependent switching).
  • Small footprint.
  • Innovative digital controller.

Benefits at a Glance

  • Small amount of regeneration purge air:  Upto 60% lower power versus Twin Tower heatless regeneration dryers.
  • Low regeneration power consumption: Up to 30% reduced regeneration costs versus heat regenerated solutions.
  • Energy management system: Delivered air quality dew point monitoring allows energy saving extension of drying cycle as appropriate.
  • Desiccant by-pass option: Avoids using more energy when only positive dew point is required.
  • Low temperature filtration: Better oil vapour filtration, better air quality downstream.
  • No need to modify desiccant bed or change orifices: Flexible solution, fits for any working condition and performance required.

 

 
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