The principle of dehumidifier is to absorb the moisture in the air by chemical adsorption or physical adsorption, thus reducing the humidity in the air. Dehumidifiers are often used in indoor spaces, such as wardrobes, drawers and damp basements. , to prevent mold breeding, bacterial reproduction and metal corrosion. Dehumidifying agent absorbs water in the air by chemical adsorption principle, that is, water molecules and adsorbents on the surface of dehumidifying agent form chemical bonds through chemical reaction, and water is adsorbed on the surface of dehumidifying agent.
The common components of dehumidifier are silica gel, activated carbon and zeolite. Among them, silica gel is a kind of material with strong hygroscopicity. When water molecules come into contact with the surface of silica gel, they will adsorb water molecules on the surface of silica gel, thus adsorbing water. Activated carbon is also a commonly used desiccant material, which has strong adsorption capacity and can adsorb organic compounds and odors in the air.
Dehumidifier principle
Dehumidifying agent can also adsorb water in the air through physical adsorption principle, that is, water is adsorbed on the surface of dehumidifying agent through van der Waals force or intermolecular electrostatic force. For example, zeolite is a commonly used physical adsorbent, which has a porous structure and can provide a larger adsorption surface area, thus increasing the contact area between water molecules and zeolite surface and realizing water adsorption.
In addition, some humidity indicators, such as sapphire blue or bromophenol blue, are often added to the dehumidifier, and it can be judged whether the dehumidifier needs to be replaced according to the color change. Although the principle of dehumidifier is simple, there are some matters needing attention in practical application. Firstly, the moisture absorption effect of dehumidifier is related to temperature and humidity.