Logis-Tech, inc. products

Refrigerant Dehumidifiers thrive in warm, humid conditions. A refrigerant dehumidifier is basically an optimized air conditioner. The goal is no longer to cool the air but use the process to remove moisture. Air is passed across a cold evaporator coil where the lower temperature causes condensation to occur.  This water is either captured in a tank or plumbed away. The cold air is then passed across a hot condenser coil and the air becomes warmer and drier. As the incoming air becomes dryer the dew point (the point where condensation occurs) becomes lower and requires the evaporator coils to become colder. When the coil drops lower than freezing the moisture freezes to the coils, which then require defrosting.  Refrigerate dehumidifier operating range is normally 56°F - 95°F.

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.