Ductless Systems Heating Cooling. Mobile Adsorption Dehumidifier.

This basic dehumidification process uses a special humidity-absorbing material called a desiccant, which is exposed to the air to be conditioned. The humidity-saturated material is then moved to a different location, where it is "recharged" to drive off the humidity, typically by heating it. The desiccant is usually mounted on a belt or other means of transporting it during a cycle of operation. Dehumidifiers which work according to the adsorption principle are especially suited for high humidity levels at low temperatures. They are often used in various sectors in industry because humidity levels below 35% can be achieved.

Ductless Systems Heat Pumps. Ionic Membrane Dehumidifier.

Ionic membranes are used in many industrial areas such as fuel cell technology, chemical engineering, and for water improvement. A specialized type of membrane can be used as an "ionic pump" to move humidity into or out of a sealed enclosure, operating at a molecular level without involving visible liquid water.
 
The solid polymer electrolyte (SPE) membrane is a low power, steady state dehumidifier for enclosed areas where maintenance is difficult. The electrolytic process delivers dehumidifying capacities up to 0.2 grams/day from a 0.2m³ (7 cu ft) space to 58 grams/day from an 8m³ (280 cu ft).
 
SPE systems generally do not have high dehumidification capacities, but because the water vapor is removed through electrolysis, the process is maintenance free. The process also requires very little electrical energy to operate, using no moving parts, making the ionic membranes silent in operation and very reliable over long periods of time. SPE dehumidifiers are typically used to protect sensitive electrical components, medical equipment, museum specimens, or scientific apparatus from humid environments.

Ductless Systems Mini Split. Disposal.

Most portable dehumidifiers are equipped with a condensate collection receptacle, typically with a float sensor to detect when the collection vessel is full, to shut off the dehumidifier and prevent an overflow of collected water. In humid environments, these buckets will generally fill with water in 8–12 hours, and may need to be manually emptied and replaced several times per day to ensure continued operation.
 
Many portable dehumidifiers can also be adapted to connect the condensate drip output directly to a drain via an ordinary garden hose. Some dehumidifier models can tie into plumbing drains or use a built-in water pump to empty themselves as they collect moisture. Alternately, a separate "condensate pump" may be used to move collected water to a disposal location when gravity drainage is not possible.

Fujitsu Ductless Systems Reviews. Ice Buildup.

Under certain conditions of temperature and humidity, ice can form on the dehumidifier cooling coils. The ice buildup can impede airflow and eventually form a solid block of ice encasing the cooling coils. This buildup prevents the dehumidifier from operating effectively, and can cause water damage if condensed water drips off the accumulated ice and not into the collection tray. In extreme cases, the ice can deform or distort mechanical elements, causing permanent damage.
 
Many better quality dehumidifiers have a so-called frost or ice sensor. which simply turns off the machine, allowing the icy coils to warm and defrost, before automatically restarting. Most ice sensors are simple thermal switches, and do not directly sense the presence or absence of ice buildup. An alternative design senses the impeded airflow, and shuts off the cooling coils in a similar manner.