The desiccant rotor structure comprises a large number of narrow and parallel air channels, processed to a composite material that is highly effective in attracting and retaining water vapor.
The rotor is exposed in sectors to different airflows. The airflow that is to be dehumidified is called process air (1) and passes through the largest sector of the rotor. The moisture in the process air is deposited into the rotor structure and the process air will then leave the rotor as dry air (2). While the rotor rotates slowly the incoming process air always meets a dry rotor structure, thus creating a continuous dehumidification process. The airflow that is used to reactivate (dry) the rotor structure is called reactivation air (3) and is first heated. Passing through the smallest sector of the rotor, in the opposite direction to the process airflow, the reactivation air removes the deposited moisture and leaves the rotor as wet air (4) – warm, moist air.