All around us in the air that we breathe is water, although we cannot see it, is there in the form of humidity suspended in the air as an invisible gas. Water in the air is measured in Relative Humidity, which simply means the amount of water suspended in relationship to the temperature and the maximum holding capacity being 100%.
Many places in the world suffer from humidity levels greater than 80% for the majority of the year
Principal of Dryair Dehumidification
The process air, which requires dehumidification, is passed through a slowly rotating rotor. This rotor is constructed using a heat resistant material which is then corrugated, producing a matrix of flutes. Silica Gel is bonded to the surface of the rotor under extremely high temperature; this unique process gives the rotor a strong hygroscopic surface and a very high water absorbing capacity.
A small section of the rotor (usually about 25%) is used in the regeneration process to rid the rotor of water. Heated air passes through this section in a counter flow direction to the process airflow and the moisture contained in the Silica Gel is evaporated and exhausted to the outside of the building via ducting. Prior to heating, the airflow is passed through the 10% of the rotor to rid the process air of any cross contamination, cool the rotor and pre-heat the regeneration air. This process of dehumidifying and regeneration is done continuously and automatically as shown in the diagram above.
You can download a PDF called 'CHE - an explaination' that further explains these principals and expands on it's uses, click the logo below;
