When a voltage is applied to the porous electrode attached to the membrane, the moisture on the anode side (dehumidifying side) dissociates into hydrogen ions (H+) and oxygen. Holding the material in a wheel-shaped matrix, as shown in this animation, is one of the most common methods. This process works most effectively at higher ambient temperatures with a high dew point temperature. Defrosting using a hot gas mechanism is much faster and more effective than air circulation at lower temperatures so when you’ve got an application with an ambient below 15°C then this is the system to go for. However a desiccant dehumidifier will generally extract moisture at a faster speed than a compressor, therefore it is debatable as to whether a desiccant dehumidifier is more expensive to run.

However, because of its relatively poor Coefficient of Performance, this design is mainly used for small dehumidifiers. One of the most popular uses for industrial dehumidifiers is on building site where it can get pretty cold during the winter months even with doors and windows in but without the heating yet plumbed in, with this in mind most portable dehumidifier manufacturers will have a hot gas defrost in their systems. If you’re looking for a dehumidifier then there are four main considerations to take into account: 1) Room temperature. The cold evaporator coil of the refrigeration device condenses the water, which is removed, and then the air is reheated by the condenser coil. Peltier dehumidifiers might look cheap when it comes to the initial outlay and running costs but there very limited in performance.

Large dehumidifiers are used in commercial buildings such as indoor ice rinks [2] and swimming pools, as well as manufacturing plants or storage warehouses.

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). The most common form of defrost mechanism is hot gas bypass, where a timer within the unit will activate a valve in the circuit to divert the warm refrigerant on its way to the condenser straight through the evaporator instead. The dehumidification process is the inverse of adding water to the room with an evaporative cooler, and instead releases heat. To get the same sort of performance from a semiconductor dehumidifier as you would from the other types mentioned, say 10l-20l per 24 hours, you’d need to have 40-80 Peltier elements operating parallel in a single unit.In day to day life it’s the RH level that causes most issues and often the first we know about it is the signature musty smell, a damp patch or speckled mould on a wall. In contrast to electrical dehumidifiers, the chemical variant uses a white granulate which withdraws the moisture from the air. litres respectively to a room it’s pretty obvious that for the vast majority of dehumidifier activities you’ll probably need a refrigerant unit. Explore our range of Passyfier Vents, which all come in a number of different colours to suit your requirements.