• Cooling and heating takes place outside the unit;
• uses relatively cheap coolants, like well water, river and cooling tower water;
• corrosion-proof, units made of polypropylene;
• microbiological decontamination;
• compactly built;
• fixed dimensions;
• competitive costs;
• easy to engineer;
• minimal maintenance;
• easy to relocate;
• very long life span;
• standard system, available in four sizes;
• low running costs;
• easy to integrate;
• operates as a humidifier too.

Working principle

Dehumidifier:

A hygroscopic salt solution called DrySol is pumped around and sprayed into dehumidfier/conditioner (A). Humid air (from outside or recycled air) passes into the conditioner. This air comes into close contact with the hygroscopic salt-solution spray, which absorbs the moisture present in the air. Dry air leaves the top of the unit. 

The salt solution including the absorbed moisture is collected in the lower part of the unit. By subsequently cooling the salt solution, the air is cooled and dried simultaneously. Droplet Eliminators at the air outlet of the dehumidifier ensure that the air stream does not contain any salt-solution particles.

Besides the low energy consumptions we very often use very cheap cooling media. The main factor for the determination of the required cooling media temperature is the desired air outlet temperature. The temperature of the cooling media should generally be 5 to 7°C below the desired air temperature.

Generally speaking Imtech DryGenic’s energy costs are at least 50% lower than those of a refrigeration coil system.
If, for instance, an Imtech DryGenic system is set at 25°C / 20% relative humidity (dew-point of 0°C), the systems needs a cooling media that has a temperature of approximately 20°C. Thus, the system can typically operate on cheap cooling media with a relatively high temperature, such as water from a river, well, sea, or cooling tower.

Removal of airborne micro-organism
Extensive research carried out by the Research Foundation of Toledo University of Ohio, USA, shows that virtually all germs and micro-organisms are killed in an absorption dehumidification system. The hygroscopic salt absorbs moisture from the air, and in addition, virtually all water contained in any micro-organisms present.
Based on a normal distribution of bacteria in the outside or return air about 97% of the bacteria is washed out of the air and eliminated in the hygroscopic solution

This spells instant death for most germs, moulds etc. The salt's germicidal action does not wear off, in contrary to a bacteria filter, which has to be replaced or cleaned regularly. A major advantage in processes or spaces requiring sterile air. In addition to the system's excellent germicidal action, it also removes gasses and solid particles from the air, resulting in a reduced emission to the environment.

The system enables complete recycling of air. Any pollution present, such as dust particles are 'scrubbed' from the air by the salt solution. An Imtech DryGenic dehumidifier can be used as humidifier as well. By simply adding demineralised water or steam condensate to the salt solution, air can be humidified hygienically during the cold, dry winter months.