Anti-Condensation Measures - Siemens SINAMICS S120 Equipment Manual
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Cabinet Design and EMC
14.7 Cooling
14.7.3
Anti-condensation measures
Special measures must be taken to prevent condensation.
Condensation occurs when the inlet temperature of the cooling medium is significantly lower
than room temperature (ambient temperature).
The table below shows the dew points (in °C) for an atmospheric pressure of 1 bar (≈
installation altitude: 0...500 m). If the temperature of the cooling medium is below the
specified value, condensation may occur (i.e. the temperature of the cooling medium must
always be ≧ the dew point temperature).
Table 14-20 Dew point temperature as a function of the relative air humidity (Φ) and the room temperature at an
installation altitude of between 0 m and 500 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).
Various measures can be taken to prevent condensation:
1. Temperature-controlled valves in the supply line.
In the cooling circuit, a temperature-controlled valve must be provided in the supply line.
2. Water temperature control.
The water temperature is adjusted in line with the room temperature. This is the preferred
method with high room temperatures, low water temperatures, and high air humidity.
3. Physical dehumidification.
This is only effective in closed spaces. This method involves condensing the air humidity
in an air-to-water heat exchanger, which is continuously operated using the cold cooling
water.
4. Installing a heater with a sufficient capacity in the cabinet.
To prevent condensation, a humidity detector can be used to monitor the air humidity. The
humidity detector is not included in the scope of supply.
342
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
Manual, (GH4), 03.2007, 6SL3097-2AJ00-0BP4
Φ=90%
Φ=90%
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
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