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11
LAST BUT NOT LEAST:
INFILTRATION
What sounds like a term from a spy nove
l
does
n
o
t r
e
f
e
r t
o
th
e
infiltr
a
ti
o
n
o
f h
os
til
e
subjects, but of damp ambient air. For with
r
egard to dehumidi
er capacity calculation,
“infiltration” refers to the external ingress
o
f
add
iti
o
n
a
l m
o
i
s
t
u
r
e
int
o
th
e
r
oo
m t
o
be
d
ehumidi
ed.
There
f
ore, the in
ltration
f
actor plays an i
m
-
portant role when calculating the dehumid
-
ification capacity required. After all, not onl
y
t
h
e air insi
d
e t
h
e room contains
h
umi
d
ity.
A
dditional moisture penetrates into the
r
oom from outside, for example due to the
c
ondition of the building’s insulation,
through door gaps, or when doors, wi
n
-
d
ows etc. are opened
.
For instance, i
f
you want to dehumidi
f
y a
room with a tem
p
erature of 20 °C from a
relative humidit
y
of 80 % to 60 %, the water
content must be reduced from 13.8 g/m
³
(80 % RH) to 10.4 g/m
³
(60 % RH), i.e. by
3
.4 g per cubic metre of air.
T
h
is amounts to 340g or m
l
in a room wit
h
1
00cubic metres of air, right? No. The mois
-
t
u
r
e
intr
oduced
fr
o
m
ou
t
s
i
de
m
us
t
a
l
so
be
ta
k
en into account.
I
f
we assume an outdoor climate o
f
2
5
°
C
a
nd 70 % RH, the water content of the out
-
door air is 16.2g/m
³
, i.e. 5.8g more than in
-
si
d
e. Casua
ll
y spea
k
ing, t
h
is moisture wou
ld
like to mix with the indoor air, which, how
-
ever, happens only partially as the room is
c
l
ose
d
an
d
we
ll
insu
l
ate
d
. T
h
is is w
h
ere t
he
i
nfiltration factor comes into play, which is
0
.3 for well insulated rooms
,
for instance.
Hence, every hour 5.8 g/m
³
x 100m
³
x infil
-
tration factor 0.3l/h = 174 g/h (0.174 l
)
would be introduced from outside, whic
h
corresponds to a daily water volume of
4.176
l
itres (0.174
l
x 24) to
b
e
d
e
h
umi
di
-
ed.
“Moisture factory human being
But a
dd
itiona
l
moisture is a
l
so intro
d
uce
d
f
rom inside. As in the case o
f
in
ltration
,
this
f
actor additionally increases the moi
s
-
ture
l
oa
d
. A sing
l
e pot p
l
ant a
dd
s a
b
out
1
50ml o
f
moisture to the room air ever
y
d
ay. T
h
is is a
l
rea
d
y more t
h
an a typica
l
Peltier device can dehumidi
f
y on averag
e
wit
h
in 24
h
ours. However
,
t
h
e moisture
l
oa
d
f
actor becomes even more in
uential i
f
pe
r
-
sons are presen
t.
During s
l
eep, every
h
uman
b
eing pro
d
uces
a
pprox.50ml o
f
moisture per hour that i
s
given o
to the room air through the skin
.
T
h
is va
l
ue increases to 70m
l
d
uring easy
se
d
entary activities an
d
excee
d
s 100m
l
d
uring
h
ouse
h
o
ld
activities. T
h
e moisture
i
ngress must there
f
ore be taken into co
n
-
sideration when selecting a dehumidifier.
It goes wit
h
out saying t
h
at you cannot use
a Peltier device to keep a bedroom dry i
f
two sleeping persons alone add 800ml of
m
oisture to t
h
e room air
d
uring eig
h
t
h
ours
of sleep, while a Peltier dehumidifier in pra
c
-
tice has a dehumidification capacity of onl
y
m
aximally 300ml in 24hours, for instance.
In the morning, the air would be more h
u
-
m
id than on the day before.
Considering that up to 2litres of water ar
e
emitte
d
into t
h
e am
b
ient air w
h
en coo
k
in
g
f
ood and even 2.5 litres when taking
a
s
h
ower, it soon
b
ecomes c
l
ear t
h
at a
ll
app
l
ications invo
l
ving an a
dd
itiona
l
moi
s
-
ture load are a hopeless endeavour
f
o
r
Pe
l
tier
d
evices or granu
l
es
!
There
f
ore, when planning your requir
e
-
m
ents, always include power reserves
f
or
t
h
e a
dd
itiona
l
moisture
l
oa
d
.
T
h
e easiest way is to re
l
y on Trotec’s app
l
i
-
cation recommendations
f
or the respectiv
e
device,
f
or here all typical parameters o
f
u
se are a
l
rea
d
y ta
k
en into account.
Quick overview of application
possibilities sorted by dehumidifier type
Condensation Desiccation
Peltier
(electrical)
Compressor Granules Desiccant
wheel
Air
circu lation
Hot gas
Kee
p
in
g
ver
y
small closed areas dr
y
(
< 10 m³
)
without infiltration
(
moisture in
p
ut
)
W
q
q
W
q
Keeping rooms with temperatures
f
rom 0 to 8
°C
dry
W
Keeping rooms with temperatures from 5 to 35 °C dr
y
W
q
Keeping rooms with temperatures from 15 to 35 °C dr
y
W
W
q
Construction dryin
g
4
4
4
Water damage restoration
4
4
i
mposs
ibl
e
;
q
poss
ibl
e;
W
recommen
d
e
d;
4
commercial types only, comfort dehumidifiers are not suited
4
TTK
100
E
TTK 100 E
TTR
57
E
TTR 57 E
TTP
2
E
TTP 2
E
Offering the world’s largest range of dehumidifiers, Trote
c
has the ideal comfort dehumidifier for every demand.
Representative
f
or the variety o
f
our devices the exemplary
s
ize comparison from left to right shows the condense
r
dryer TT
K
100 E, which for example already achieve
s
the whole daily capacity o
f
a Peltier dehumidi
f
ier in 10
minutes, the ultra-compact TT
P
2
E with Peltier technology
and the adsorption dehumidifier T
TR
57
E for cool,
unheated rooms
.
11


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