Desiccant Dehumidification
A dehumidification method that removes moisture from air by passing it over a rotating wheel or bed of silica gel or other desiccant material. More effective than refrigerant dehumidifiers in cold or low-humidity environments.
What Is Desiccant Dehumidification
Desiccant dehumidification is a moisture removal process that passes wet air over a hygroscopic material (typically a rotating silica gel wheel) that absorbs water vapor from the air stream, then regenerates the desiccant with heated air that is exhausted outside the building, removing moisture from the structure without the temperature limitations of refrigerant-based dehumidifiers. This technology is essential for drying in conditions where conventional dehumidifiers underperform.
When Desiccant Dehumidifiers Are Necessary
Refrigerant (LGR) dehumidifiers lose efficiency as temperature drops because the refrigerant coil must be colder than the dew point to condense moisture. Below 65 degrees, their output drops dramatically. Desiccant units do not rely on condensation. They adsorb moisture chemically, so they maintain full capacity regardless of temperature. This makes them the correct tool for winter water losses, unheated buildings, cold basements, and any environment where the temperature cannot be raised sufficiently for refrigerant units.
Desiccant Dehumidifiers in Insurance Estimates
Desiccant dehumidifiers are more expensive to operate than refrigerant units, and adjusters may push back on the higher daily rate. The justification is environmental conditions. Document the ambient temperature and relative humidity at the start of drying. If conditions are below the effective range of refrigerant dehumidifiers, the desiccant unit is not an upgrade but a necessity. IICRC S500 standards support the use of desiccant dehumidification when conditions dictate. Include the temperature and humidity readings in the drying log to document the justification.
Frequently asked questions
A desiccant dehumidifier uses a rotating wheel or bed of moisture-absorbing material (typically silica gel) to pull water vapor from the air. Wet air passes through the desiccant, which absorbs the moisture. The desiccant is then regenerated by passing hot air through it to drive off the absorbed water, which is exhausted outside the building.
Desiccant dehumidifiers outperform refrigerant units in cold environments (below 65 degrees), in low-humidity conditions where the air is already relatively dry, and in situations requiring very low dew points. They are standard equipment for hardwood floor drying, pharmaceutical and data center restoration, and winter water damage work.
No credit card required