Rapporten från etapp 1 - BeBo
Rapporten från etapp 1 - BeBo
Rapporten från etapp 1 - BeBo
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Distance between the pressure taps is as follows:<br />
Figure 4. Length 3 large area duct setup with<br />
Tap 2 in the foreground<br />
Results<br />
Table 1 Pressure tap distances<br />
Pressure Taps Distance<br />
Tap 1 to Tap 2 255 cm<br />
Tap 2 to Tap 3 211,5 cm<br />
Tap 3 to Tap 4 110 cm<br />
The results of the laboratory experiment are below.<br />
Once the ducts were put together, one size i.e., the<br />
large area duct, was connected to the fan system.<br />
The fan was set to deliver seven liters per second<br />
and later twelve liters per second of air through the<br />
ducts. Pressure drops were first measured for ten<br />
minutes from Tap 1 to Tap 2, then Tap 1 to Tap 3,<br />
then Tap 1 to Tap 4 or Length 1, Length 2 and<br />
Length 3 respectively. This procedure was repeated<br />
on the other duct system of different area.<br />
To measure the sound, the sound meter was pointed<br />
at the outlet of the duct, approximately one meter<br />
away. According to building code standards, low<br />
frequency sounds need to be minimized. The sound<br />
experiments measured decibels from 125 Hz, 250<br />
Hz and 500 Hz. In the laboratory, background noise<br />
was reduced to a minimum, by performing tests<br />
during non-working hours.<br />
Bilaga 5 sid 3 (6)<br />
3