VAV Controllers LVC-LowVelocity - TROX
VAV Controllers LVC-LowVelocity - TROX
VAV Controllers LVC-LowVelocity - TROX
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Case-radiated noise<br />
Example (contd.)<br />
Calculation of air-regenerated noise<br />
fm 63 125 250 500 1000 2000 4000 8000<br />
LW 53 53 53 49 45 43 39 32<br />
Distribution 0 0 0 0 0 0 0 0<br />
Duct bend 0 0 1 2 3 3 3 3<br />
End reflection 10 5 2 0 0 0 0 0<br />
Sound power level<br />
to room<br />
43 48 50 47 42 40 36 29<br />
Room attenuation 6 6 5 5 4 4 4 4<br />
A-weighting −26 −16 −9 −3 0 1 1 −1<br />
Corrected level 11 26 36 39 38 37 33 24<br />
LPA 44<br />
Calculation of case-radiated noise<br />
fm 63 125 250 500 1000 2000 4000 8000<br />
LW₂ 30 23 25 29 33 32 25 24<br />
Ceiling attenuation 4 4 4 4 4 4 4 4<br />
Room attenuation 6 6 5 5 4 4 4 4<br />
A-weighting −26 −16 −9 −3 0 1 1 −1<br />
Corrected level 0 0 7 17 25 25 18 15<br />
LPA₂ 29<br />
In a variation from the quick selection, different room attenuation<br />
values have been assumed.<br />
The logarithmic addition of air-regenerated noise and<br />
case-radiated noise equals 44 dB(A) and does therefore not<br />
exceed the required sound pressure level of 45 dB(A).<br />
Nominal<br />
size<br />
V<br />
Case-radiated noise<br />
∆pst = 50 Pa ∆pst = 150 Pa ∆pst = 300 Pa<br />
LW₂ in dB LW₂ in dB LW₂ in dB<br />
fm in Hz fm in Hz fm in Hz<br />
l/s<br />
m³/h<br />
63<br />
125<br />
250<br />
500<br />
1000<br />
2000<br />
4000<br />
8000<br />
63<br />
125<br />
250<br />
500<br />
1000<br />
2000<br />
4000<br />
8000<br />
63<br />
125<br />
250<br />
500<br />
1000<br />
2000<br />
4000<br />
8000<br />
8 30 25 6 7 12 14 4 7 13 26 14 16 20 24 18 21 28 27 18 21 26 30 26 29 38<br />
125<br />
30 110 28 18 19 21 22 15 13 10 29 25 27 29 32 29 27 25 30 30 33 35 38 37 35 35<br />
55 200 29 23 24 25 26 20 16 8 31 30 32 33 35 33 29 24 31 35 38 39 42 42 38 33<br />
75 270 30 26 27 27 28 23 17 7 31 33 36 36 37 36 31 23 32 38 41 41 44 45 40 33<br />
12 45 24 5 6 12 15 9 3 4 26 10 13 20 25 22 19 22 28 13 18 25 31 30 28 33<br />
160<br />
50 180 28 18 18 21 24 19 9 7 30 23 25 29 33 32 25 24 31 26 30 34 40 40 35 36<br />
85 305 29 23 22 24 27 23 12 8 31 28 30 32 37 36 28 26 33 31 35 37 43 44 38 37<br />
120 430 30 27 25 26 30 25 14 9 32 32 33 34 39 38 29 26 34 35 38 39 45 47 39 38<br />
20 70 26 10 14 19 13 8 4 7 28 16 20 28 24 22 19 22 29 19 24 34 31 31 29 32<br />
200<br />
75 270 29 19 21 25 22 18 11 9 31 24 27 34 33 32 26 24 32 27 31 39 40 41 36 34<br />
135 485 30 22 24 27 26 22 14 9 32 28 30 36 37 36 29 25 33 31 34 42 43 45 39 34<br />
190 685 31 25 26 28 28 25 15 10 33 30 32 37 39 39 31 25 34 33 36 43 46 48 40 35<br />
30 110 24 13 8 19 23 18 11 2 26 17 17 27 32 30 26 21 28 20 22 32 38 38 36 33<br />
250<br />
120 430 28 22 18 25 30 27 17 7 31 27 27 33 39 40 33 26 32 30 32 38 45 47 43 38<br />
210 755 30 26 22 27 33 31 20 9 32 30 31 35 42 44 35 28 34 33 36 40 48 51 45 40<br />
300 1080 31 28 25 29 35 34 22 10 34 33 33 37 44 46 37 29 35 36 38 42 50 54 47 41<br />
9