TITANUS
MICRO·SENS
®
Design
06/13
91
Project design for forced air flow
Air conditioning plants are divided into low-speed and high-speed plants
(see table below). The information given in this chapter applies only to low-
speed plants. There is insufficient information from experience with high-
speed plants. Where air conditioning ducts have flow speeds of more than
10 m/s, therefore, smoke testing must be carried out for the best reaction
behavior to be determined.
Low-speed systems High-speed systems
Flow speed maximum 6 bis10 m/s > 10 m/s
Duct cross-section large small
Differential pressures
along the flow direction
small
large
The speed distribution in an air conditioning duct looks as follows:
Figure 54: Speed distribution in an air conditioning duct
To achieve optimum detection results, the pipe system must be arranged in
the area v
1
to v
3
.
To achieve the best location for constructing the pipe system, the exhaust
duct should be as far as possible from sound dampers, air baffle plates and
kinks. The guideline figure for the distance from such “obstacles” is at least 3
x the smallest duct diameter.
If it is absolutely essential to fit the pipe system directly behind baffle plates,
sound dampers or bends, the main speed areas must be monitored.
5.3.4
Monitoring ai
conditioning ducts
spiration
Location of the pipe system
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