Wildeboer FK90, Быстрый старт

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ve sound power levelit
al
e
R
]
Bd[
L
-20
+10
+5
0
-5
-15
-25
125 250 500 1000 2000 4000 8000
Octave mid frequency [Hz]
+15
-10
Flow velocity v [m/s]
A
63
-30
2
4
6
8
10
12
2
4
6
8
12
v [m/s]
A
User Manual 5.0-2 (2016-10) 10 Subject to change
Series FK120
FK90 fire dampers
Dimensioning (3) Relative sound power level, examples, nomenclature
Relative sound power level
Example:
V = 4000 m³/h
B = 500 mm
H = 300 mm
A
A
= 0.150 m²
A
free
= 0.098 m²
D
p
s
= 29 Pa
v
A
= 7.4 m/s
L
WA
= 47 dB(A)
Sound power level L
W-Oct
for the octave mid frequencies
f [Hz] 63 125 250 500 1000 2000 4000 8000
L
WA
[dB(A)] 47 47 47 47 47 47 47 47
D
L
7.4 m/s
[dB] 5 6 1 -3 -6 -9 -15 -22
L
W-Oct
[dB] 52 53 48 44 41 38 32 25
B [mm] Width
H [mm] Height
A
A
[m²] Inflow cross-section B x H
A
free
[m²] Free cross-section
V [m³/h] Volume flow
v
A
[m/s] Flow velocity in inflow cross-section
D p
s
[Pa] Static pressure drop
L
WA
[dB(A)] A-weighted, area-corrected sound power level
L
W-Oct
[dB] Octave sound power level L
W-Oct
= L
WA
+ D L
D L [dB] Relative sound power level to L
WA
f [Hz] Octave mid frequency
Nomenclature