The ability of water to change from a gas to a liquid (condensation) and back to gas causes problems for many consumer and industrial products. Removing moisture from enclosures using solid-state dehumidifiers has many advantages over conventional methods. It is smaller, more convenient and inexpensive to run. In a You Tube video Big Clive made an independent assessment of their performance.
Rosahl solid-state dehumidifiers use a low-voltage electrical supply to remove moisture from enclosures. Dehumidification takes place at a molecular level using a solid-state polymer electrolytic membrane (SPE). This gives the process several advantages for protecting enclosures. Firstly, it works without condensing the moisture to liquid water, so cleaning and maintenance are not needed. Secondly, the membranes have a long operating life and do not need recharging or replacing. They are also very small and for enclosures from under two litres, the membrane is thumbnail size. Being sold-state, there is no noise or vibration and nothing to wear out.
Big Clive reviews Rosahl
Traditional methods for solving this are effective but have some operational disadvantages. Moisture adsorption using silica gel or similar materials is compact and cost effective but requires regular maintenance. It must be the recharged or replaced or it will fail to effective. Another way is to condense the moisture into liquid water and then dispose of it by drainage of pipework. This is particularly suited to larger volumes. Peltier coolers are compact and effective for small volumes but need a fan. They also need regular draining and cleaning to discourage mould growth.
Finally, solid-state dehumidifiers are suitable for a range of application including remote or difficult to access sites and equipment.