|
Calculation formula |
|
Correction factor Кp |
|---|
|
ΔPp = ΔP х Кp |
|
|
0° |
22° |
45° |
|
|
Кp |
1 |
1.25 |
1.5 |
|
Calculation formula |
|
Correction factor К |
|---|
|
LWA = LWAO x K |
|
Sap [m2] |
0.01 |
0.02 |
0.05 |
0.1 |
0.2 |
0.4 |
|
|
K [dB(A)] |
-9 |
-6 |
-3 |
0 |
+3 |
+6 |
Designation:
ΔPp - pressure loss at various vane positions [Pa];
ΔP - pressure loss [Pa];
Кp – correction factor for pressure loss calculation depending on louvre deflection angle;
LWA - sound power level [dB(A)];
LWAO - sound power level for air pass 0,1 m2 [dB(A)];
K - correction factor for sound power level calculation depending on air pass [dB(A)];
Sap - air pass [m2];
V - rated speed [m/s].