Desiccant Dehumidifier
How It Works
Mode of operation №1
This mode of operation involves only one common fan for both air flows i.e. the process air and reactivation air. In this case occurs maximum heat recovery due to distribution of the air flows shown on the picture. This solution makes the installation easier and allows achieving the lowest possible dew point.
This mode of operation is implemented only in the smallest desiccant dehumidifier type MDC250.
In this case, desiccant dehumidifier has only one radial fan for both process air and reactivation air intake and exhaust/supply. The process air passes through the honeycomb rotor (desiccant wheel) with tremendous active dehumidification surface. The rotor is made of Silica Gel that has enormous capacity to absorb water molecules. The humid process air passes through ~60% of the rotor face area. The process air is dry after crossing the rotor, because the moisture has been extracted by absorption process to the silica gel.
Simultaneously reactivation airflow initially is partly dehumidified and preheated while crossing the small purge face area of the desiccant wheel. Then the air is heated up to 90-140oC and crosses so called regeneration zone of the rotor. The silica gel gives away the moisture in to the reactivation airflow by means of evaporation of water in to the hot air flow that has increased capacity to be saturated with water vapor. The warm and humid airflow then is exhausted to the outside of the desiccant dehumidifier.
In such way, the rotor (desiccant wheel) restores its capacity to absorb water molecules from the process airflow. The reactivation airflow performs also the function of cleaning the rotor from contaminants that could be present on the surface of the rotor. Continuous rotation of the rotor provides a nonstop process of adsorption/reactivation. Special holding frame from both sides of the desiccant wheel prevents the mixing of the process air and the reactivation airflows. Moreover, the absence of condensation during the dehumidification process allows installing the desiccant dehumidifier, without a connection to drainage system.
