The refrigeration dryers of the DHR series are designed for continuous operation in compressed air systems. The direct cooling of the evaporator saves energy. If no compressed air is passed through the dryer, the refrigeration compressor switches off automatically, only when the compressed air is passed through again does the cooling compressor automatically switch on.
The hot and humid compressed air that enters the dryer is pre-cooled in an air to air heat exchanger. It flows through an evaporator, where its temperature drops further to the programmed dew point due to heat exchange with the cooling medium. The compressed air then flows into the separator, where the precipitating water is removed by a separation system. Before being fed back into the compressed air network, the amount of heat recovered is fed back into the dry air.