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Active heating and ventilation can help achieve a comfortable
and healthy living environment and may even save you heating
costs.
The interaction of temperature and
air humidity
If the room air is too humid, ventilation would at first appear non-
sensical in the winter, when the outside air is also cold, damp and
just as humid.
Cold air however, can absorb little or no moisture. When this air
enters the living areas it becomes warmer. And then the air can
absorb much more water vapour. After just a few minutes of giving
a room an airing, you can see on the digital display how the relative
humidity goes down.
Room air temperature Water content (in g/m
in °C
± 0
+ 6
+ 12
+ 18
+ 24
* at 100 % air humidity
Dew-point
This interdependency of temperature and relative humidity is
expressed by means of the dew-point:
If the air is cooled continuously at constant absolute humidity,
then the relative humidity will steadily increase up to a maxi-
mum of 100%. If the air is cooled further, then the excess water
vapour is separated out in the form of water droplets.
air humidity in the air
3
) in case of saturated*
4.8
7.3
10.7
15.4
21.8
11
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