Solid Moisture absorber refill tab is a solid substance that can absorb water vapor from the air, also known as solid desiccant. Using a porous material with a large surface area, it absorbs moisture from the air under surface adsorption and capillary condensation. Since the partial pressure of water vapor on the surface of the solid hygroscopic agent is lower than the partial pressure of water vapor in the air, it absorbs the moisture in the air and achieves the purpose of air dehumidification.

The most commonly used solid Moisture absorber refill tabs are silica gel and calcium chloride. On the psychrometric diagram, the air treatment process using the solid hygroscopic agent is an isenthalpic heating. When the solid hygroscopic agent is in contact with the moist air, the solid hygroscopic agent absorbs the moisture in the moist air, and at the same time releases the latent heat of vaporization to heat the air, and the enthalpy value of the air before and after dehumidification remains unchanged.
The typical application of solid Moisture absorber refill tab in evaporative cooling air conditioning technology is to use it in the runner, and the runner dehumidifier uses the solid moisture absorbent to absorb the moisture in the air to achieve the purpose of air dehumidification. The key component of the rotary dehumidifier is the rotary wheel, which is composed of a corrugated medium made of special composite heat-resistant materials, and the corrugated medium is loaded with solid moisture absorbent.
The advantages of using solid Moisture absorber refill tabs are simpler equipment and lower investment and operating costs.
The disadvantage is that after the solid Moisture absorber refill tab absorbs moisture to a certain extent, it needs to be regenerated, and the dehumidification performance is also unstable, so it is suitable for use in places with a small amount of dehumidification.