Chemical Absorbent Dehumidifiers
For industrial use as well as damp homes
You will often find a little packet of silica inside the packaging of any goods that need proofing against condensation and water damage. On a larger scale, this material can be used to adsorb moisture and dehumidify the air.
These are especially useful if you live in an extremely warm or humid climate. Desiccant dehumidification is also used for larger applications such as ice rinks and industrial facilities. In an ice rink, for example, humidity is certainly an issue, and it can be counter-effective to the maintenance of the ice. Very effective, desiccant dehumidification is also very energy intensive. These usually require the use of heavy fans.
This form of dehumidification is advisable for especially humid conditions but it is impractical for moderately humid conditions.
How does a chemical adsorbent dehumidifier work?
In this process air from a building’s interior flows over the desiccant material. It attracts moisture. The desiccant material is simultaneously dried by air flowing the other way that exhausts the moisture to the outside of the building. This describes the most common form, cyclical chemical adsorbent dehumidifiers.
A wheel cycles the desiccant material. On one side of the wheel, material takes moisture out of the air. On the other end, material is dried by air flow that removes the moisture to the outside air.
Non-cyclical chemical adsorbent dehumidifiers are a variation that is not as common. In this process, the chemical adsorbent material is contained on a bed. Two different air streams, low humidity and high humidity, are passed through sealed chamber sections (without mixing the high humidity and low humidity air streams). The desiccant material may be removed and dried at intervals.
One of the downfalls of a chemically adsorbent dehumidifier and its desiccant material is that there are varying stages of humidity coming out of the unit. For example, if the material is very wet then it will dehumidify at a different rate than when the material is almost dry. This means that chemically adsorbent dehumidifiers are generally not as controlled and as effective as other types.