Less energy required
May 1st 2005

Following intensive work on its Boreas series of refrigerant compressed air dryers for medium to high volume flows, Donaldson has come up with a machine that now uses even less energy.

The new generation dryers are equipped with Variopulse control.

This electronic control on microprocessor basis sequentially measures the data of the sensors that give information on the current status of the refrigerant compressed air dryer, evaluates these signals with the dryer-specific parameters and, on the basis of this evaluation, sends out control signals with which, among other things, the refrigeration agent and the fans are controlled.

The advantage claimed for this is that a hot-gas bypass is not needed which from an energy as well as economical point of view only destroys energy and causes operation costs.

With the smallest sizes of the Boreas series (1800 to 2800m3/h), presented in a compact housing, the Variopulse control makes use of an energy saving suction pressure control. This guarantees that only as much refrigerant agent is compressed as is needed for the safe, reliable operation and generation of the defined pressure dew point. For other sizes (to flow rates of 28 500m3/h), speed control by frequency converter is used.

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