VAV Controllers LVC-LowVelocity - TROX

Acoustic quick selection
Using quick selection for sizing VAV controllers will rapidly
provide optimum results. The first selection criteria are the given
volume flow rates Vmin and V max . The expected sound pressure
level in the room is then determined from the static pressure
differential. The quick selection tables are based on normally
accepted attenuation levels; if the sound pressure level exceeds
the required level, a larger volume flow controller and/or a
silencer is required.
For dimensions and technical data for type CS sound
attenuators refer to leaflet 6/5/EN/....
For a more detailed selection and design of
type LVC-LowVelocity VAV controllers refer to the
Easy Product Finder design programme on our homepage.
System attenuation in dB/oct. acc. to VDI 2081
(values incorporated in the quick selection table)
fm in Hz
63
Duct bend 0 0 1 2 3 3 3 3
Room attenuation 5 5 5 5 5 5 5 5
End reflection 10 5 2 0 0 0 0 0
125
250
500
Correction for distribution into the duct system
(values incorporated in the quick selection table)
V
1000
2000
4000
l/s 150 200 250 300
m³/h 540 720 900 1080
dB per octave 0 1 2 3
8000
4 dB/octave ceiling reduction and 5 dB/octave room attenuation
have been allowed for in the calculation of case-radiated noise.
Quick selection of sound pressure level LPA in dB(A)
Air-regenerated noise
Case-radiated
noise
Nominal
size
V
∆pst
min
∆V
∆pst in Pa ∆pst in Pa ∆pst in Pa ∆pst ∆pst in Pa
50 150 300 50 150 300 50 150 300 300 50 150 300
Without CS
CS050
L = 500
CS050
L = 1000
CS050
L = 1500
LPA LPA₁ LPA₁ LPA₁ LPA₂
l/s m³/h Pa ±% dB(A) dB(A) dB(A) dB(A) dB(A)
8 30 30 15 27 37 43 14 22 28 4 10 15 10 9 21 30
125
30 110 30 12 35 45 51 24 33 39 17 24 29 26 16 27 34
55 200 30 8 39 49 55 30 39 44 24 31 36 33 20 30 38
75 270 30 5 42 52 58 34 42 48 29 36 41 38 22 33 40
12 45 30 15 28 38 45 19 28 34 12 19 24 20 8 20 28
160
50 180 30 12 34 44 51 25 34 40 19 27 32 28 17 28 36
85 305 30 8 36 46 54 29 37 43 23 31 36 33 21 32 39
120 430 30 5 38 48 56 21 39 45 28 34 39 36 23 34 42
20 70 30 15 31 40 47 21 30 36 13 20 26 23 10 21 29
200
75 270 30 12 35 45 52 25 34 42 19 26 32 29 17 29 37
135 485 30 8 36 47 54 28 37 44 22 29 35 33 21 32 40
190 685 30 5 36 47 55 29 37 45 26 31 36 35 23 34 42
30 110 30 15 31 41 48 24 32 40 17 25 32 30 16 27 34
250
120 430 30 12 36 47 54 28 38 46 21 30 38 35 24 35 42
210 755 30 8 36 47 55 28 39 47 23 31 39 36 27 38 46
300 1080 30 5 36 48 55 29 39 48 25 32 39 37 29 40 48
7