About this deal
Its main use is in habitable rooms where it operates continuously without noise and over a 24 hour period can extract a maximum of 1 litre of water/day even at low vapour pressures. Thermoelectric dehumidifiers use a Peltier heat pump to cool a surface and condense water vapor from the air. A novel thermo-mechanical anti-icing/de-icing system using bi-stable laminate composite structures with superhydrophobic surface" (PDF).
g. when it comes into contact with a cold surface, it exceeds dew point (100% RH) and the excess moisture condenses into water on the cold surface as condensation. Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling". Unlike a refrigerant, peltier elements don’t need a defrost mechanism as the plates never get cold enough to freeze up.
Power Consumption - Generally desiccant type will use consume slightly higher energy cost compared to compressor type.
To be effective as a dehumidifier, an air conditioner must be designed or modified so that most or all of the water that condenses is drained away in liquid form, rather than re-evaporated. Not only would that increase the size of the unit to something totally unmanageable, it would also send the energy consumption through the roof. The effect of the hot gas is to melt any ice on the evaporator so that it runs down into the condensate collection device (bucket). But no, it’s not right because we haven’t taken into account the moisture in the external air that will seep into the room.They cannot absorb much moisture, the area they can affect without a fan is tiny and once saturated the packets have to be dried out manually or replaced, making them a single use item.