Logis-Tech - Desiccant Dehumidifiers
Desiccant dehumidifiers thrive in cooler temperatures and excel when low relative humidity and dew points are required. These units can operate in sub-freezing environments. Units have a normal operating range of -40°F to 120°F. Desiccant dehumidification requires a desiccant media, airflow and heat to reactivate (purge moisture from the desiccant). A typical setup involves a desiccant wheel or desiccant rotor that slowly spins within a sealed chassis. The wheel is segmented into two non-equal parts usually around a 75%-25% ratio. Moisture-laden air is pulled through the larger portion of the rotor where the desiccant material absorbs the moisture and the conditioned air exits warmer and dryer and is distributed as Process Air.
A heated air stream is pulled in the opposite direction through the other 25% of the wheel. The hot air causes the desiccant wheel to release its captured moisture and is generally vented to the outdoors as warm, wet Reactivation air. (Heat Exchangers can be adopted for greater efficiency in the Reactivation process)
As the Process Inlet air temperature increases, reactivation efficiency is lost.
Small dehumidifiers under 400 SCFM
Dehumidifiers under 400 SCFM are generally lightweight and portable and can used to dehumidify rooms, small green houses, interior of civilian and military vehicles, interior of aircraft, storage containers or just about any small storage area that needs protection for stored material from corrosion, mold, mildew and moisture damage. Bug infestation can also be eliminated with a low RH environment. These dehumidifiers can usually dehumidify areas from 500 square feet up to 4,000 square feet with a normal ceiling height of 10 feet; however, dehumidifier effectiveness in controlling space RH conditions is contingent on how well the controlled space is sealed from the outside. Desiccant or refrigerate based models have power requirements from 120VAC/1Phase/50-60Hz to 460VAC/3Phase/50-60Hz depending on what site electrical power is available and what style dehumidifier you choose for your climatic RH and temperature conditions. Normally dehumidifiers in this size range will be offered in desiccant or refrigerate models.