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37Mounting and installation work
5.4.2 Positioning of the steam distributor
The location of the steam distributor should be determined at the time of dimensioning the air condition-
ing system. Please note the following instructions to ensure proper humidication of the duct air.
Calculating the absorption distance
The steam, emitting from the steam distributor, requires a certain distance to be absorbed by the air so that
it is no longer visible as steam. This distance is referred to as absorption distance "B
N
" and serves as
a basis for the determination of the minimum distances from the downstream components in the system
Fig. 16: Absorption distance "B
N
"
The calculation of the absorption distance "B
N
" is dependent on several factors. For a rough estimation
of the absorption distance "B
N
", the following table is useful. Recommended standard values listed in
this table are based on a supply-air temperature range of 15 °C to 30 °C. The values given in bold type
apply to steam distribution pipes DV41-..., DV61-... and DV81-..., the values in brackets apply to
the OptiSorp steam distribution system.
Humidity at inlet
ϕ1 in %rh
Length of absorption distance B
N
in m
Humidity at outlet ϕ2 in %rh
40 50 60 70 80 90
5 0.9 (0.22) 1.1 (0.28) 1.4 (0.36) 1.8 (0.48) 2.3 (0.66) 3.5 (1.08)
10 0.8 (0.20) 1.0 (0.26) 1.3 (0.34) 1.7 (0.45) 2.2 (0.64) 3.4 (1.04)
20 0.7 (0.16) 0.9 (0.22) 1.2 (0.30) 1.5 (0.41) 2.1 (0.58) 3.2 (0.96)
30 0.5 (0.10) 0.8 (0.17) 1.0 (0.25) 1.4 (0.36) 1.9 (0.52) 2.9 (0.88)
40 0.5 (0.11) 0.8 (0.20) 1.2 (0.30) 1.7 (0.45) 2.7 (0.79)
50 0.5 (0.13) 1.0 (0.24) 1.5 (0.38) 2.4 (0.69)
60 0.7 (0.16) 1.2 (0.30) 2.1 (0.58)
70 0.8 (0.20) 1.7 (0.45)
φ1 in %rh: Relative supply air humidity prior to humidication at the lowest supply air temperature
φ2 in %rh: Relative supply air humidity after the steam distribution pipe at maximum capacity
For duct widths <600 mm the absorption distance for the OptiSorp system increases by approx. 50%
φ1: Supply air humidity before humidication
φ2: Supply air humidity after humidication
Expansion and mixing zone
Absorption
distance B
N
Safety humidistat /
Humidity sensor
37


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