How it works? The operating principle of condensation dehumidifiers


The compressor cooling system is the most important part of the condensation dehumidifiers. It allows for condensing the steam and lowering water contents in the air. At the heart of the cooling system lies a compressor which compresses and pumps the refrigerant, forcing it to circulate around the whole system. The higher the pressure gets, the more the temperature grows. A compressed refrigerant (in gaseous state) is transferred by a pipe to the condenser, where it is cooled down.

The heat of the refrigerant is received by the air around the exchanger (condenser). The refrigerant changes its state from gas to liquid due to its pressure and the temperature drop. A condensed refrigerant runs through the de-watering filter, which absorbs the steam that could find its way into the drier when its manufactured or maintained. After passing through the filter, the liquid runs through a throttle (a capillary or an expanding valve), whose flow resistance causes a pressure difference, that makes the refrigerant expand and evaporate. The evaporation process takes place in the evaporator.

Unlike condensation, evaporation causes a drop in both pressure and temperature. Owing to this phenomenon, the air gives up its heat to the refrigerant (and allows it to evaporate). The air temperature falls below the dew point, which makes the excess humidity condense on the walls of the condenser. The expanded refrigerant is sucked in again by the compressor, and the whole cycle starts over.

In case of operating in lower ambient temperatures, the water condensed in the evaporator may freeze, which increases the resistance of air flow in the exchanger. To avoid this, an electronic control system periodically opens the electromagnetic valve. This redirects the hot refrigerant (in its gaseous state) to the evaporator. This makes the ice thaw and flow down to the condensate tank.