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Before going into the details of the two dehu-
midification methods, we first have to dispel a
myth:
Heating makes the air warmer, not drier
Heating is certainly not among the dehumidifi-
cation methods! It is true that warm air can ab-
sorb more water than cold air. Thus, by heating
the room air with a constant water content, the
relative humidity level of this warm air would
indeed be reduced at first.
But the hotter the air, the more it is surrounded
by cold surfaces on which the moisture con-
denses. After all, heating alone cannot make
moisture disappear – and therefore the water
content of the air remains the same.
To withdraw moisture from the room air eec-
tively and permanently, the only technical
solution available is dehumidification, either by
condensation or desiccation.
Condensation versus desiccation
All devices oered on the market with designa-
tions such as refrigerant dryer, condenser dryer,
condensation dehumidifier, electric or Peltier
dehumidifier are based on the principle of con-
densation.
On the other hand, there are technologies for
desiccant dehumidification. These include the
still widely advertised granules. However, truly
eective, permanent dehumidification can only
be achieved with this method when using elec-
trical devices with hot air regeneration, more
commonly known as desiccant dehumidifiers.
It is just a matter of technology
Even if many device designations on the market
may vary, the devices usually belong to either
of the two groups, and their names provide in-
formation on the dehumidification technology
used.
Leaving aside the granules, the procedure is
the same for all electrically operated devices:
ambient air is sucked in by a fan, moisture is
withdrawn from the air inside the device, and
drier air is emitted into the room, which contin-
uously mixes with the more humid room air
until the desired humidity level is reached.
However, the dehumidification methods as well
as the fields and limits of application of both
device groups dier considerably.
The figure above shows the content
of a typical refill pouch for passive
dehumidification by means of
granules. These disposable pouches
usually contain highly hygroscopic
salts such as calcium chloride
serving as a drying agent that can
withdraw moisture from the room air
by desiccation.
In direct comparison with electrical
dehumidification units with hot air
regeneration, the cost-benefit ratio of
such solutions is extremely poor.
Desiccant bags are mainly used for
protection against temporary humid-
ity damage during transport, for in-
stance for shoes, electronic equip-
ment, suitcases, bags or medicinal
products.
DEW POINT
VERSUS
HYGROSCOPY
DEHUMIDIFICATION METHODS
TWO TECHNIQUES – ONE OBJECTIVE:
A CONTROLLED REDUCTION OF EXCESSIVE HUMIDITY
4


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