How Do Ventless Dryers Work?
The clothes dryer that most of us are familiar with works by pulling in air, heating the air and then discharging through a vent. The discharged air is full of moisture so it is sent through an airtight hose, a rigid vent placed in a wall and expelled outside.
Ventless clothes dryers have no output air vent and rely on other methods to dispel the moisture laden air. Two types are condensation dryers and heat pump dryers. Ventless dryers can function anyplace in the home and do not require installing a vent pipe making them perfect for renters and small spaces. All ventless dryers are powered by electricity due to the combustible nature of gas.
Like a traditional dryer, the condensation dryer pulls in cool, dry air from the room. It is heated and passed through the clothes, but instead of being vented out, the air travels through a heat exchanger. A cooling device, the heat exchanger cools the air causing the moisture in the air to condense and flow into your washer drainpipe or into a containment chamber. As the air is dried, it is reheated and passed through the clothes again. The process is repeated until the clothes are dry.
Heat Pump Dryers
A heat pump dryer pulls air from the room which is passed through a heat pump where the cold side condenses the water vapor into either a drain pipe or a collection tank and the hot side reheats the air to use again. Heat pump dryers use less than half the energy required by either condensation or traditional dryers.
Care and Maintenance
As with traditional dryers, ventless dryers require attention to keep lint filters clean. And those with condensation tanks need to be cleaned out monthly to be sure that no debris or lint is clogging pipes. Ventless dryers do require adequate air flow to operate properly. So, if they are housed in a closet, the door should be open during drying cycles.