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2.3.1 Absorption distance "D"
Make sure that the absorption distance is met in order to let the air absorb the steam dispersed by the tubes.
In this absorption distance, the steam is still visible in the air stream in the form of fog. If any obstruction is
placed in this area, condensate may occur. For this reason, it is imperative to consider this absorption distance
when placing the humidifiers.
2.3.2 How to calculate absorption distance « D »
In order to determine the absorption distance, the attached calculation table can be used:
•
RH1 = relative humidity of air before humidification in %.
•
RH2 = relative humidity of air after humidification in %.
•
D mini = minimum absorption distance in feet (ft).
This calculation table is to be used for temperatures between 68°F
speed 985 fpm).
For calculated distances, contact your Armstrong agent.
2.3.3 Minimum absorption distance
The steam dispersion pipes must be positioned after the minimum specified absorption distance. Please follow
the guidelines depending on the configuration of your air handling unit.
D
Fig. B 2-3: Before / after a fan
= Dispersion tube
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
12
5
10
Outlet RH2
[%]
2.95
2.62
40
3.61
3.28
50
4.59
4.27
60
5.91
5.58
70
80
7.55
7.22
90
11.48 11.15 10.50
D
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Inlet RH1 [%]
20
30
40
Minimum absorption distance "D" [ft]
2.30
1.64
-
2.95
2.62
1.64
3.94
3.28
2.62
4.92
4.59
3.94
6.89
6.23
5.58
9.51
8.86
and 77°F
(20°C)
Fig. C 2-3: Before / after heating battery or filter
1.5 x D before a particle filter or absolute filter
50
60
70
-
-
-
-
-
-
1.64
-
-
3.28
2.30
-
4.92
3.94
2.62
7.87
6.89
5.58
. (Maximum air
(25°C)
1.5 X D
1.97 X in
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