Bedienungsanleitung Trotec TTP 5 E (Seite 4 von 12) (Englisch)

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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withdrawn from the air inside the device, and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

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