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Refrigeration drying live: the room air
that is taken in is cooled to below its
dew point at the dehumidifier’s cold
evaporator and water condenses on
the fins and refrigerant line.
Since most dehumidification tasks at home are
carried out at temperatures between 12 and
25 °C, and thanks to its excellent ratio of price,
performance and energy eciency, this refrig-
erant dryer is among the most frequently used
dehumidifiers in the private sector and building
industry.
Compressor-operated condenser dryers work
on the same principle as a refrigerator. The de-
vice houses a compression refrigeration system
conveying a refrigerant through two heat ex-
changers – a condenser and an evaporator.
Made possible by abrupt cold shock
By means of a compressor and an expansion
valve, the refrigerant is exposed to changing
pressures within this closed circuit, which results
in the gas heating up on the condenser side
during compression, and abruptly cooling
down far below the room temperature on the
evaporator side during decompression.
At the evaporator, the temperature is literally
brought to a full stop – the air is abruptly cooled
to below its dew point temperature, the mois-
ture bound in the air condenses and turns into
drops of water dripping into a collection con-
tainer. The cold, dry air is now guided through
the hot condenser, absorbs heat and then flows
back into the room as dry, warm air before taking
up moisture again.
Ice doesn’t stand a chance
Depending on the ambient temperature and
humidity level, the evaporator can be extremely
cold and there might be icing at its surface at
room temperatures below 15 °C.
An increasing formation of ice virtually “clogs”
the fins (icing) and reduces the device’s dehu-
midification capacity.
This is why all compressor-operated condensa-
tion dehumidifiers are equipped with mecha-
nisms for regular evaporator defrosting – usually
by means of air circulation or hot gas, see types
of defrosting on page7. If there was no defrost-
ing by air circulation or hot gas, the evaporator
(cooling element) would freeze completely over
time until a full-fledged “ice wall” would make
any kind of air flow impossible.
TECHNICAL DIFFERENCES
AND FUNCTIONAL PRINCIPLE
CONDENSER DRYERS WITH COMPRESSOR TECHNOLOGY
6


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