Desiccant dehumidification by Munters
Munters dehumidification systems remove moisture from the air by using a desiccant; a material which easily attracts and holds water vapor. Desiccant dehumidifiers are especially well-suited for removing moisture from air at a low temperature and low humidity level.
At the heart of these dehumidifiers is a patented desiccant wheel made up of corrugated material. Air passes through the flutes of the material, contacting the desiccant. The incoming process air stream gives off its moisture to the desiccant. The process air is dry as it leaves the wheel. The humidity-laden wheel rotates slowly into a second, smaller airstream which has been heated.
This smaller exhaust airstream, known as reactivation air, warms the desiccant. The warmed desiccant gives off its moisture which is then carried away by the reactivation air. The newly dried desiccant material is rotated back into the process air, where it absorbs moisture once again. Desiccant dehumidification systems have become increasingly popular in recent years because of lower equipment costs achieved through economies of scale, modular designs, and the use of desiccant silica gel wheels. It should be noted that whereas the reactivation heat in the original desiccant systems was produced by burning natural gas, all electric desiccant systems are now available. These desiccant systems are extremely efficient and simple in that they use rejected heat from the condenser to regenerate the desiccant wheel.