HANKISON HHDp SERIES dryers deliver a guaranteed dew point of +2C. A guarantee that lets our customers rest easy during their daily operations. The economic-and therefore cost-efficient-treatment of the compressed air on a constant basis is made possible by the two base functions of the dryer –air cooling and refrigerant cooling. In the first of two cooling stages, namely in the air-to-air heat exchanger, the incoming warm, saturated compressed air is pre-cooled. In the second stage, in the air-to-refrigerant heat exchanger, the compressed air is cooled to a dew point temperature of +2 C using evaporated refrigerant. This causes the water vapour to condense to a liquid. Any moisture droplets, contaminants or dirt particles still in the air stream are removed in the Centriflex® separator / filter system. The condensate is safely extracted by means of automatic condensate drains. We at HANKISON are particularly proud of the fact that we can keep our promise of a +2 C dew point on a constant basis owing to the finely-adjusted balance between air and refrigerant cooling. Subsequently, the outgoing compressed air passes the warm incoming compressed air in the air-to-air heat exchanger. This exchange of heat brings the outgoing compressed air up to processing temperature. In the refrigeration cycle, the compressor sucks in the gaseous refrigerant and pressurises it to the condensing pressure. The compressed refrigerant is liquefied bye cooling in the air-cooled or water-cooled condensor.

The liquid refrigerant is fed into the air-to-refrigerant heat exchanger where it is completely evaporated. The refrigerant exits the air-to-refrigerant heat exchanger as a gas, which is taken into the compressor by suction.

The unit can handle changing loads and partial loads. This prevents freeze-up of the dryer.