Adsorption dryers can only be energy efficient if they contain premium desiccant material. The desiccant used in Pneumatech adsorption dryers is carefully selected from a wide range of European and North-American suppliers, based on following key selection criteria:
We carefully balance initial capital investment with ongoing running cost. Silica gel has the highest adsorption capacity and is therefore used in heat regenerated adsorption dryers (PE & PB). In the dynamic operation conditions of heatless adsorption dryers (PH) only a small percentage of the total static adsorption capacity is used because of the relatively short cycle times. The use of silica gel in the case of -40°C/-40°F PDP applications would increase the initial investment significantly, but would not bring any purge loss reduction or other benefits. Heatless adsorption dryers are therefore filled with activated alumina3 which provide equal dew point requirements (-40°C/-40°F PDP) and energy efficiency at lower investment costs.
³Exception is the PH2-45 which makes use of molecular sieves. 4NWR: non water resistant 5WR: water resistant