Anti-Condensation Measures - Siemens SINAMICS S120 Manual
Cabinet modules liquid-cooled
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Commissioning the cooling circuit
5.2 Coolant for the internal deionized water circuit
Note
Determining the appropriate biocide
The type of bacteria determines the biocide.
The concentration must be adapted to be in compliance with what the manufacturer
recommends.
It is not permissible that biocides and antifreeze are mixed.
Antifreeze already has a biocidal effect in the minimum concentration specified above.
5.2.3
Anti-condensation measures
The customer must take measures to protect the devices against condensation.
If condensation occurs in the device, it must be de-energized and dried before switching on
again.
Condensation occurs when the inlet temperature of the coolant is significantly lower than
room temperature (ambient temperature). The permissible temperature difference between
coolant and air varies as a function of the relative humidity ϕ of the ambient air. The air
temperature at which the aqueous phase drops out is referred to as the "dew point".
The table below shows the dew points (in °C) for an atmospheric pressure of 1 bar
(≈ installation altitude, 0 to 500 m). If the temperature of the coolant is below the specified
value, condensation may occur, i.e. the coolant temperature must always be ≥ the dew point
temperature.
The coolant temperature must be controlled according to the following table.
Table 5- 6
Dew point temperature as a function of relative air humidity ϕ and room temperature at an installation altitude
of 0 m.
T room
φ=20%
φ=30%
[° C]
10
<0
<0
20
<0
2
25
0.6
6.3
30
4.7
10.5
35
8.7
14.8
38
11.1
17.4
40
12.8
19.1
45
16.8
23.3
50
20.8
27.5
The dew point also depends on the absolute pressure, i.e. the installation altitude.
The dew points for low atmospheric pressure are lower than those at an altitude of 0 m, i.e. it
is always acceptable to calculate the coolant supply temperature for an altitude of 0 m.
120
φ=40%
φ=50%
φ=60%
<0
0.2
2.7
6
9.3
12
10.5
13.8
16.7
14.9
18.4
21.3
19.3
22.9
26
22
25.7
28.8
23.7
27.5
30.6
28.2
32
35.3
32.6
36.6
40
φ=70%
φ=80%
φ=85%
4.8
6.7
7.6
14.3
16.4
17.4
19.1
21.2
22.2
23.8
26.1
27.1
28.6
30.9
32
31.5
33.8
34.9
33.4
35.8
36.9
38.1
40.6
41.8
42.9
45.5
46.6
φ=90%
φ=95%
φ=100%
8.4
9.2
10
18.3
19.1
20
23.2
24.1
24.9
28.1
29
29.9
33
34
34.9
36
36.9
37.9
37.9
38.9
39.9
42.9
43.9
44.9
47.8
48.9
49.9
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A
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