Page 3 - drytec_process-air-drying

Humidity, brief and dry.

Moisture denotes the content of liquid, e.g. water, in a substance or gas. In industrial
practice, it is mostly about the water content of the process air or a product.

Depending on the temperature of the air, only a saturation, and corresponds to a relative humidity of
limited amount of water can be absorbed. The rule is 100 % (see temperature-humidity diagram below).
that warm air can absorb more water than cold air.
The absolute humidity x is given in mass of water per Since each temperature along the saturation line can
amount of dry air. be assigned an absolute moisture value, the saturation
or dew point temperature can also be specified for an
The liquid content of the air, from which no more liquid explicit description of the liquid content. This is
can be absorbed at a certain air temperature, is called particularly advantageous when the moisture content
is low (e.g. <1 g / kg).

Temperature-humidity diagram

30 g / kg 34.4 g / m 3

25 g / kg 100 % 28.7 g / m 3
No further water relative
absorption possible humidity
(saturation)
20 g / kg 23.0 g / m 3
If the water
Water content 15 g / kg less than Cooling leads to 50 % relative 17.2 g / m 3 Absolute moisture
content is
condensation of water
1 g / kg,
humidity
only the
as drops or mist
dew point
temperature
10 g / kg is an 11.5 g / m 3
illustrative
moisture Heating or drying
value lead to a lower
5 g / kg relative humidity 5.7 g / m 3

0 g / kg 0.0 g / m 3
-20 ⁰C -10 ⁰C 0 ⁰C 10 ⁰C 20 ⁰C 30 ⁰C

Air or dew point temperature

3