Rapporten från etapp 1 - BeBo
Rapporten från etapp 1 - BeBo
Rapporten från etapp 1 - BeBo
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Pressure Meter: Testo AG Germany<br />
Model: Testo 521 Serial Number: 01362781/709<br />
Sound Meter: Brüel & Kjær Precision Sound Level Meter Octave<br />
Analyzer<br />
Model: Typr 2215 Serial Number: 866138<br />
Air Speed Meter: Alnor Compuflow Thermo-Anemometer<br />
Model: GGA-65P Serial Number: 900181<br />
Methodology and Procedure<br />
Figure 2. Pressure meter<br />
The first steps of the experiment were the calibration and performance measuring of the<br />
equipment and instrumentation. Fan speeds and air flow performance were tested to<br />
establish the range of the equipment. The tests conducted on the ducts are limited to<br />
seven liters per second and twelve liters per second, to meet the indoor air quality<br />
requirements.<br />
The configuration of the ducts includes three parts: a three meter duct, a two meter duct<br />
connected with a 90 degree right angle elbow joint, and a one meter duct connected with<br />
a 90 degree boot joint. The entire system was put together and joints attached with duct<br />
tape. For the experiment, two sizes of ducts are to be compared. The large area duct and<br />
the small area duct have a cross sectional area of 3456 mm 2 and 2016 mm 2 respectively.<br />
For the pressure tests, four holes<br />
were drilled into the ducts to hold<br />
pressure taps. The first hole was<br />
drilled in the three meter duct 30<br />
centimeters from the inlet. The<br />
second pressure was set 15<br />
centimeters from the outlet of the<br />
three meter duct which then<br />
follows the 90 degree right angle<br />
elbow joint. The third hole is<br />
situated 15 centimeters from the<br />
outlet of the two meter duct, which<br />
then follows the 90 degree boot<br />
joint. Finally, a pressure tap was<br />
drilled 15 centimeters from the<br />
outlet of the one meter duct. The<br />
reason behind the dimensions of<br />
the pressure taps is to obtain a high<br />
level of laminar flow for appro-<br />
priate pressure measurements.<br />
Length 3<br />
Length 2<br />
Length 1<br />
Figure 3. Laboratory room with duct system setup<br />
Bilaga 5 sid 2 (6)<br />
2