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-2
0
-15 -1
0
-5
0
51
0
15 2
0
25 3
0
Ab
so
l
ute
h
um
i
d
i
ty
g/
A
ir temperature °
C
5CVWTCVKQPEWTXG
|TGNCVKXGJWOKFKV[
Indicates the maximum humidity value in grams o
f
water
per cubic metre o
f
air that can be absorbed by the air.
Water vapour contents above t
h
is curve are impossible
.
I
LLUSTRATION © TROTE
C
.
1
.
4
2
.
1
3
.
3
4.
9
6
.
8
9
.
4
1
2
.
9
1
7.
3
23
.1
3
0
.
0
3
0
25
2
0
15
10
5
0
3
2
6 °
C
2
4 °
C
2
2 °
C
20
°
C
18 °
C
0
%
1
0
%
2
0
%
30
%
40
%
5
0
%
60
%
7
0
%
80
%
90
%
1
00
%
0 %
2
0
%
40 %
6
0 %
8
0 % 100 %
0 %
2
0
%
40 %
6
0 %
8
0 % 100 %
0 %
2
0
%
40 %
6
0 %
8
0 % 100 %
0
%
2
0
%
40
%
6
0
%
8
0
%
100
%
0
%
2
0
%
40
%
6
0
%
8
0
%
100
%
0
%
2
0
%
40
%
6
0
%
8
0
%
100
%
0 %
2
0
%
40 %
6
0 %
8
0 % 100 %
I
n
ue
n
ce
of
th
e
r
e
l
a
tiv
e
h
umidity on human
biolo
g
ical interactions:
B
acteria
V
iruses
M
ould
M
ites
I
n
f
ection o
f
r
es
p
iratory organs
A
llergies, asthma
C
orrosion
R
e
p
resentat
i
ons accor
di
n
g
t
o
S
c
o
e
ld/Sterlin
g
dia
g
ram
H
ealthy and pleasant
r
oom
h
um
idi
ty
l
eve
l
Formation o
f
biological
organ
i
sms an
d
i
ntera
c
-
ti
ons w
i
t
h
h
uman or
environment
THEORY FIRST, PRACTICE SECOND
A basic knowledge of the subject of humidit
y
is rather helpful for keeping your rooms ideall
y
dry. The air cannot absorb an unlimited amoun
t
of water. There is a saturation limit, i.e. a max
i
-
mum amount of water vapour that can be ab
-
sorbed by the air in absolute terms. This is the
absolute humidity, given in grams of water per
cub
i
c
m
e
tr
e
o
f
a
ir.
On that basis, the water vapour content that is
actually dissolved in the air in relation to the
water vapour quantity that the air could max
i
-
mally absorb at the respective temperature is
referred to as the “relative humidity” (RH).
Thi
s
m
ea
n
s
th
a
t if th
e
r
oo
m
a
ir’
s
r
e
l
a
tiv
e
h
u
mi
d
-
ity amounts to 50 %, for instance, exactly half
of the maximum amount of water possible fo
r
the current temperature is dissolved in the air
.
It is just a matter of temperatur
e
The water absorption capacity of the air ther
e
-
fore always depends on the prevailing tempe
r
-
ature. T
h
e coo
l
er t
h
e air, t
h
e
l
ess water it can
a
b
sor
b
. T
h
is is i
ll
ustrate
d
in t
h
e c
h
art on page
2
on the basis o
f
ve temperature values.
In examp
l
e1, t
h
e re
l
ative
h
umi
d
ity remains
80 %, w
h
ereas t
h
e correspon
d
ing a
b
so
l
ute w
a
-
ter content in the air
uctuates considerably de
-
pen
d
ing on t
h
e temperature.
In example2, the amount o
f
water contained
in t
h
e air in a
b
so
l
ute terms remains i
d
entica
l
,
w
h
ic
h
is w
h
y t
h
e re
l
ative
h
umi
d
ity increases
w
h
i
l
e t
h
e temperature
d
rops.
W
e
h
ave to a
d
mit t
h
at t
h
is is quite a comp
l
ex
ma
tt
e
r
and it becomes even more compl
i
-
c
ated in view of the fact that corrosion, rotting
a
nd mould formation are only promoted by the
re
lativ
e
humidity, and never by the
a
b
so
lut
e
wa
t
e
r
co
nt
e
nt
o
f th
e
a
ir.
O
nly relative is absolutely relevant
S
o as demonstrated in example2: at a room
t
emperature of 5 °C and a water content of
5
.4g/m
³
the relative humidity level would b
e
8
0 % – at which even metal corrodes – entailing
t
he risk of mould formation
,
whereas the same
w
ater content at a room temperature of 25 °C
l
eads to a relative humidity of only 23.5 %,
w
hich represents a much too dry room climat
e
t
hat irritates the respiratory system.
I
n thi
s
c
lim
a
t
e
m
ou
l
d
a
n
d
r
us
t w
ou
l
d
n
o
t
s
t
a
n
d
a
chance even though the room air still contain
s
t
he same amount of water, namely 5.4g/m³
.
So all that matters is regulating the relative
humidity level in a controlled manner. The
absolute amount of moisture being with-
drawn from the air is irrelevant; only the rel-
ative humidity level is important!
A
basic understanding o
f
these physical corre
-
l
ations is a crucial
f
actor
f
or implementing an
e
ective dehumidi
cation solution adapted t
o
your app
l
ication
.
Temperature
COMFORT CHART (according to Leusden and Freymark)
co
mf
o
rt
ab
l
e
s
till
co
mf
o
rt
ab
l
e
uncomfortable, dry or humid
Relative humidity
3


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