Condair Esco

4.3.1 Type DR 73
3
The conical discharge of steam at a right angle to the air current, and
the variable arrangement of the steam pipes (illustration 1), account for the
very high steam resolution achieved with the distribution pipes type DR 73.
Steam therefore is absorbed by the air after a relatively short distance;
accordingly, the humidification distances to a downstream obstacle or the
measuring point are also short.
As depicted in illustration 1, the arrangement and distribution of the
steam outlet openings of the distribution pipe DR 73 is identical to that of
a spray nozzle air humidifier. Furthermore, compared to most commercial
steam humidifiers, the steam pipes are spaced considerably closer, so
the max. steam mass flow per meter of distribution pipe is substantially
reduced.
To compute the humidification distances B N, B F or B S to the respective
obstacles and B M to the measuring point (in accordance with illustrations
2-5), and the “terminology of the humidification distance”, the aforementioned
optimal steam distribution and the following values are essential:
• Air velocity w
• Humidity x1 before humidifier
• Humidity increase ∆x
• Air temperature t before humidification
• Type of downstream obstacle and measuring point
Max. spacing between steam distribution pipes and
steam nozzles, and max. steam capacity in kg/hr
per meter of distribution pipe
E
E
D C D
W C max D E m D max.
[m/s] [mm] [mm] [mm] [kg/hr · lfm]
1 450 400 150 30
2 425 350 150 35
3 400 300 150 40
4 390 270 150 45
5 385 200 150 50
W = air velocity
D, E = distance from wall
C max. = max. distance between
distribution pipes
m D max. = max. steam capacity in kg/hr
per meter of distribution pipe
Figure 1