How does a Home Desiccant Dehumidifier Work

A home desiccant dehumidifier makes use of certain materials in order to remove moisture from the surrounding air. This is accomplished by exposing a desiccant type of material to an air stream that has a high relative humidity level. The desiccant material attracts and retains some water vapor and the desiccant is then exposed to an air stream that has lower relative humidity causing the retained moisture to be drawn out of the material.

Desiccant Dehumidifier Moisture Content

Substances that are considered to be desiccant materials have a natural affinity for absorbing water vapor. In general, the moisture content of desiccant matter is relative to the humidity of the surrounding environment. If they are brought into contact with atmospheres that have lower humidity levels, then desiccant materials will have comparably low moisture content. When in areas of high relative humidity these materials will quickly develop high moisture content.

Virtually all kinds of substances have some degree of desiccant behavior. However, the phrase "desiccant material" is used only to refer to materials that demonstrate a high enough level of vapor absorption that allows it to be predictable produce, with a beneficial result. This is the type of material that is used in a desiccant dehumidifier.

In the operation of a desiccant dehumidifier, the first stream of air will be dehumidified and the second stream of air is simply used to revitalize the desiccant substance so that it can begin another dehumidification cycle. Because of this procedure, the water vapor content of the first air stream is lowered and the second air stream's humidity level will be increased.

Desiccant Dehumidifier Design

In most cases, the desiccant types of air dehumidifiers on the market will have four main components. The first component holds the desiccant substance, which could be any of several types of materials.

The second component of a room dehumidifier that uses desiccant material is the fan that moves the air that needs to be dehumidified through the compartment that holds the desiccant.

Portable Desiccant DehumidifierThe third part is another fan to draw the low humidity air through the holding compartment of the desiccant material. Finally, a heater is employed to heat up the stream of air that is used to regenerate the desiccant.

Some desiccant dehumidifier models are designed for a cyclical humidifier dehumidifier mode of operation, in which the desiccant substance is held in a compartment and the air that needs to be dehumidified is moved through that chamber. As the desiccant material in the chamber gets to a certain degree of moisture content, a low humidity stream of air is then introduced into the container until the material has been renewed and is dried out enough to be effective as an air dehumidifier again.

Some desiccant dehumidifier models are designed with two chambers to hold the desiccant materials. In this type of arrangement, one of the containers will function as an air dehumidifier while the other one is being rejuvenated. In this way, the home dehumidifier is able to be constantly dehumidifying and keeping the humidity levels in the home in check.