Desiccant Dehumidifier

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Desiccant Dehumidifiers


Desiccant dehumidifiers work by drawing air into the unit and pass it over a material, such as silica gel, which will absorb the moisture. Just like how a packet of silica gel works that you find in medicine bottles, only on a much larger scale.  These units have the ability to dry large areas quickly because they typically can process large volumes of air.  Refrigerant units do not typically process the volume of air that a desiccant can.

While there are other dehumidifiers that can also a do a great job of keeping spaces dry, desiccant types are ideal for colder climates where temperatures go below 70°F. This is mainly because they don’t need to cool air before dehumidifying it. There is no condensate pump in these units which means you won’t have problems with water freezing inside the unit during extremely cold conditions. Additionally, similar to a tumble dryer, all the moisture is removed as water vapor, not a liquid, and the wet air outlet, or reactivation air, is warm and wet and needs to be vented to the outdoors.

The desiccant dehumidifier wheel technology makes it quiet and will work in a wide range of conditions. It does not matter whether the temperature is 55° or 95°F, its performance will remain the same. While the single phase units operate on electric reactivation only, there is a choice of steam, direct-fired gas (natural and LPG), or diesel with larger trailer mounted units. These other heating options will reduce running costs.  Some systems feature a combination of different heaters. 

The dry desiccant dehumidifier system is the one we have been discussing and is the most widely used in the market today, although there are other types of units.  These units have a rotating wheel with absorbent material in them.  As the wheel rotates the air passes through the absorbent material and comes out the other side as dry air.  It then goes through a regenerating zone where the material is heated to remove the moisture it collected.  This moisture is then exhausted to the outdoors.

The benefits of using this type of equipment include a reduction in heating bills, reduced mold and mildew problems, purified air for allergy sufferers, minimal noise and the efficient drying of air in a wide range of temperatures.  Typically refrigerant style units only operate in temperatures between 70° - 90°.  This is because refrigerant dehumidifiers efficiency is drastically reduced when temperatures go outside of this range.

Desiccant dehumidifiers are most commonly used for large commercial and industrial applications.  These would include but not be limited to manufacturing facilities, packaging companies, water restoration jobs, food manufacturers, large warehouses, libraries, museums, pharmaceutical companies, railroad companies, and more.  In other words, desiccant dehumidifiers are a great choice for large areas that would need to be dehumidified continuously or have a temperature that is consistently below 70°F. 

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This article was published on Sunday 22 July, 2012.

Back to main topic: Desiccant Dehumidifiers
Desiccant Dehumidifier is Best for Large Buildings
Portable Desiccant Dehumidifiers
When to Choose a Desiccant Dehumidifier
Desiccant Dehumidifiers Can Process Large Volumes of Air
Uses of Portable Desiccant Dehumidifiers
Portable Desiccant Dehumidifier Technologies
Dessiccant, What Does it do?

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