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Adiabatic Humidifiers
You may have read about AxAir resistive boilers (Defensor Mk 5), which solve the scaling problem in electrical steam humidifiers and AxAir gas fired steam humidifiers (Condair GS) that save on energy costs.
Another well accepted practical humidification technology is the adiabatic system. An adiabatic system depends on two technologies: evaporation via mats/filters or a contact media sprayed/wetted with water and atomising using one or two component nozzles and ultrasonic dispersal.
However, adverse media reports have raised the problem of dissemination of germs, dust, allergens, bacteria, spores and fungi, through air conditioning plants and, specifically, adiabatic humidification systems. The critics are certainly correct where the technology does not match hygiene requirements or if the installation and maintenance is below standard. Older systems, in particular, such as "washers" and evaporative systems by mats, require a large amount of maintenance.
Moreover, adding biocides to the humidifier water or the humidification process results in high costs. UV radiation of the water, also frequently applied, can only be effective where radiation is applied directly. Edges, corners, suspended particles, etc. may be left untreated and generated shadows severely limit effectiveness. In addition, UV radiation only kills the germs that it reaches and fails to prevent the growth of bacteria at non-radiated places.
Regular draining of water from washing through or operating with fully demineralised water is rarely successful. To counter these limitations, a system is needed which addresses the inherent problems and satisfies the requirements for total hygiene.
The unique technology of the AxAir Condair Dual 2 adiabatic system provides a solution, with:
- Modular construction - suitable for retrofitting existing adiabatic systems, such as "washers";
- Short absorption distances - unlike classical nozzle systems which require a very long absorption distance and droplet separator, limiting efficiency and increasing water consumption;
- Satisfaction of all hygienic standards;
- Economical use of water and electricity;
- Low maintenance costs.
The Condair Dual 2 uses specially developed molecular, low-pressure nozzles, with ceramic orifices, to atomise humidification water as an aerosol, providing primary evaporation.
Located 80 cm downstream of the nozzles, a highly porous resistant ceramic plate, 50 mm thick and arranged in a brick form, captures residual non-evaporated water as humidification films, which are then evaporated by the energy of the passing air. An added advantage of this method is the rapid drying effect after switching off spraying, whenever there is no humidification demand.
Fully demineralised water is used exclusively, firstly for the hygiene and also for general cleanliness. However, the central feature that takes the concept of total hygiene further is silver ionisation. According to the flow of the humidification water silver ions are added by means of electrolysis to the water just before the nozzles. This silver, in turn, accumulates via the aerosols on the ceramic plates, applying an additional preventative effect on the airflow. Thus, the Condair Dual's combination of an aerosol technique with subsequent evaporation ensures high humidification efficiency (above 90 per cent) with a very low volume of residual water, hygienic operation, low energy and maintenance costs.
PDF - Condair Dual 2 (150kB) »
For further information please contact Lindsey Henderson, Humidification Product Manager,
Lindsey Henderson
E-mail: lhenderson@axairclimate.co.uk | |
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