VEX100, calculation example

VEX unit: VEX170-1-FC

Desired output:  qv = 1800 l/s (6500 m3/h) and pt = 250 Pa

VEX170-1-FC, LWA1 - Suction side

VEX170-1-FC, LWA1 - Pressure side

 

Reading:

Read LWA1 (extract duct) and LWA2 (pressure ducts) on curve.

LWA1: 73 in range 1 (marked with red dot on diagram)

LWA2: 85.5 in range 1 (marked with red dot on diagram)


Suction side (outdoor air/extract air)

Frequency band  63 125  250  500  1K  2K  4K   8K
 LWA1 73
Correction factor KW (LW1) 6 -3 -3 2 -5 -17 -24 -33
Sound output level suction side LW1 79 70 70 75 68 56 49 40

Pressure side (supply air/exhaust air)

Frequency band  63 125  250  500  1K  2K  4K   8K
 LWA1 85,5
 Correction factor KW (LW2) read off on diagram  -7 -11  -8 -3   --3  -9  -13  -21
 Sound output level pressure side LW2 78,5  74,5  77,5  82,5  82,5  76,5  72,5  64,5

 

Surroundings (sound output)

Frequency band  63 125  250  500  1K  2K  4K   8K Db(a) 
LWA1 73  
Correction factor KW (LW1) read off on diagram  10  -9 -10  -17  -24  -24  -33  -9
Sound output level surroundings (LW1) 83  75 64  63  56 49  43  37 64 

Surroundings (sound pressure)

Weighting  dB(A) 
LWA1 read off in range I  73
Correction factor KpA (LW3) read off on diagram  -26
 Sound pressure level surroundings (LpA3)  47

 

See measurement setup here:

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