Desiccant Dehumidification Desiccant Dehumidification Technology Demonstrations Desiccant systems use either absorption or adsorption processes to dehumidify the air.
Common desiccants are lithium chloride, silica gel and molecular sieve.
As the air passes through the desiccant, latent heat load is converted to a sensible heat load resulting in warm, dry air. This air is then cooled to the desired process air temperature. In comparison, a conventional vapor-compressor chiller cools the air to be conditioned below its dew point thereby causing the moisture in the air to condense in the evaporator. The evaporator temperature must be low if it is to be used for applications requiring low humidity levels. The process air is then too low for application purposes and must be reheated to the desired levels.