Calculation example VEX200

VEX unit: VEX250

Desired output:  qv = 900 l/s (3,240 m3/h) and pt = 250 Pa

VEX250, LWA1 - Suction side

 

VEX250sound, sugeside, red spot 

VEX250, LWA2 - Pressure side

 

VEX250 Sound curve, red spot 

 

Reading:

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

LWA1: 67.5 in range I (marked with red dot on diagram)

LWA2: 81 in range I (marked with red dot on diagram)


Suction side (outdoor air/extract air)

Frequency band  63 125  250  500  1K  2K  4K   8K
 LWA1 67,5
Correction factor KW (LW1) 9 0 -4 3 -13 -17 -24 -39
Sound output level suction side LW1 76,5 67,5 63,5 70,5 54,5 50,5 43,5 28,5

Pressure side (supply air/exhaust air)

Frequency band  63 125  250  500  1 K  2 K  4 K   8 K.
 LWA2 81
 Correction factor KW (LW2) read off on diagram  -2 -10 -12  -6 -9  -16  -26
 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 67,5  
Correction factor KW (LW1) read off on diagram  2 -6 -15 -19 -23 -28 -33  -37  -16
Sound output level surroundings (LW1) 69,5 61,5 52,5 48,5 44,5 39,5 34,5 30,5 51,5

Surroundings (sound pressure)

Weighting  dB(A) 
LWA1 read off in range I  67,5
Correction factor KpA (LW3) read off on diagram  -32
 Sound pressure level surroundings (LpA3) 35,5

 

See measurement setup here:

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