Liebert Hiflex - Page 110

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11.11 -Deadening cartridges for delivery channels - Silent Carts (models Over)
These are special cartridges made of self-extinguishing material with
high deadening power. They are guaranteed against particle disag
gregation and release as a result of the friction with the channel air. The
pressure drop due to the introduction of these cartridges in the channel
are low in comparison with the advantages resulting from the noise re
duction.
One or two cartridge rows can be installed in the delivery channel: for
channel heights between 600 mm and 1100 mm one single rank, where
as for channel heights between 1100 mm and 1200 mm one or two rows,
by simply fitting them from the top.
With these cartridges, despite a small additional pressure drop, it is possible to obtain a considerable
noise reduction as shown below.
The maximum achievable noise reduction is -8.5 dB(A) at 2 m on the front part (and at 1.5 m from the
floor) and -13 dB(A) at 1 m and at 45 from the unit top with a cartridge rank in a 1200-mm-high channel.
The reduction values refer to the comparison with the noise values that can be measured for each unit
with free drain. In the same conditions, with a supplementary cartridge
rank, respectively -9.5 dB(A) and -14 dB(A) can be obtained.
Cartridge features
Unit
dimensions
free section
cartridge number
Unit dimensions free section
1 rows 2 rows
4 500 x 195 x 500 400 x 100 2 4
6 500 x 195 x 500 400 x 100 3 6
8 500 x 195 x 500 400 x 100 3 6
5 500 x 195 x 500 400 x 100 4 8
7 500 x 195 x 500 400 x 100 6 12
9 500 x 195 x 500 400 x 100 6 12
Damping in dB(A)
n rows
Damping in dB(A) at different frequencies (Hz)
n. rows
63 125 250 500 1000 2000 4000 8000
1 1 4 7 15 26 28 27 14
2 1 6 12 27 49 53 49 23
Pressure drop
n rows
Pressure drop (Pa) for the different air flows (m
3
/s)
n. rows
0.2 0.4 0.6
1 1 4 9
2 3 11 26