For cooling or humidifying purposes, water is either trickled through a cooling tower or atomised in an air-scrubber. The water evaporates, leaving behind the salts previously dissolved in it. The evaporation loss is compensated for by the continual resupply of fresh water. Since the resupply water also contains salts, the concentration of salts in the system increases continually. This is referred to as excessive concentration.
In order to avoid this, VDI 3803 recommends upper concentration limits for the most important salts. Exceeding these limits can result either in corrosion (e.g. sulphate and chlorine) or stubborn, performance-inhibiting deposits (carbonate hardness).
The increased temperatures and continual influx of oxygen lead to an increased likelihood of corrosion. In air-scrubbers, this also creates the risk of drip corrosion due to the high salt contents.
Reliable concentration figures can be calculated from the ratio of the limit values in VDI 3803 and the concentrations of the constituents in the supply water. If the maximum permissible concentration level is exceeded, the salt content in the circuit must be reduced. This can be achieved with the aid of a JUDO automatic desalination device, which opens a solenoid valve when the preset conductivity level is exceeded, and drains off a small part of the system contents, and the salts contained in it, into the drainage system.
The volume of water removed in this way, plus the evaporation volume, gives the resupply volume required. The most economical concentration figures are those from at least 3.5x, corresponding to a 3.5x higher salt concentration in the circuit than in the resupply water.
With water treatment systems, the water can be treated in such a way that the highest possible concentration figures are reached, incurring only small desalination losses.
Pollen or other impurities brought into the system from outside lead to the accumulation of sludge. In this case, the installation of JUDO filter systems is advisable.
Microbial contamination, algae (cooling tower) and slime, which are promoted by increased temperatures and accumulations of nutrients in the circuit, as well as the action of light (cooling tower), can be effectively combated with JUDO cleaning agents. JUDO UV disinfection systems should preferably be used for spray-humidifiers and air-scrubbers.
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30.07.2010 / 10:20 
