Rapporten från etapp 1 - BeBo

Figure 8. The small area duct is in the foreground and large area
duct is in the background connected to the pressure tap.
For the large area duct results, the
pressure drop at twelve liters per
second is most interesting with the
observed air speed of approximately
1,53 meters per second. The
dimension of this duct will contain
twelve liters per second air flow to
feed radial ducts of smaller air flows.
Therefore, upon observing Figure 3,
the pressure drop for both the large
area duct and the small area duct
with respect to their optimal air
flows falls near 40 Pa. The limit, in
grey, is an area where a compromise
of pressure drops can be made for
both duct areas.
Observing the sound level results, the decibel readings are all the same because of the
background noise in the laboratory affected the results. Even still, it can be observed that
no extra sound occurs when the flow is increased.
Conclusions
For each duct, it is possible to combine them into a ventilation system to provide seven
liters per second air into a room. The large area duct can supply the smaller area ducts at
roughly the same pressure drop, thereby simplifying the fan requirements on the supply
air side. As well, sound levels do not increase when the flow is increased in the large area
duct.
Bilaga 5 sid 6 (6)
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