» Excessive concentrations in the circulating water » Impurities brought into the system » Increased temperatures and oxygen supply
The problem 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.
Pipe corrosion
Limescale deposits
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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water sample taken on site.
21.05.2012 / 22:12 
