Volume Flow Controller - TROX - #9

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9 Case-radiated Noise Correction values for case-radiated noise ca. 6 m ca. 6 m Installation configuration Ä LW / Ä LW1 in dB, base on fm in Hz 63 125 250 500 1000 2000 4000 8000 31 30 27 21 19 11 11 9 30 29 26 21 18 12 12 10 30 29 24 21 19 16 14 12 29 28 23 22 21 18 16 13 25 25 20 18 16 14 12 11 22 22 19 17 15 13 11 10 20 19 18 17 15 12 10 10 33 28 26 26 34 33 37 31 32 29 25 27 33 33 37 32 32 32 24 28 34 38 40 34 31 31 26 33 39 44 43 35 27 28 23 29 35 42 36 31 24 25 23 29 34 41 35 29 22 23 22 29 35 39 33 29 100 125 160 200 250 315 400 100 125 160 200 250 315 400 Ä LW Ä LW1 Ä LW/ Ä LW1 Nom. size TVR-Easy LW2 = LW - Ä LW TVRD-Easy (with acoustic cladding) LW3 = LW - Ä LW1 TVR-Easy TVRD-Easy Duct system according to DIN EN 1506 High density acoustic insulation, supplied by others Example Given: ‡max = 105 l/s or 378 m3/h  pg = 500 Pa Specified sound pressure level in the room 45 dB(A) For further assumptions, see calculation procedure Calculation procedure Quick selection: TVR-Easy 125 Air-regenerated noise LpA = 52 + 8 = 60 dB(A) Specification is not met, so circular silencer required TVR-Easy 125 with CF050/125 x 1500 Air-regenerated noise LpA1 = 36 + 8 = 44 dB(A) Case-radiated noise LpA2 = 32 + 8 = 40 dB(A) fm 63 125 250 500 1000 2000 4000 8000 LW (Page 8) 72 76 74 66 61 57 54 52 Ä LW 30 29 26 21 18 12 12 10 LW2 42 47 48 45 43 45 42 42 Ceiling reduction 4 4 4 4 4 4 4 4 Room attenuation 6 6 5 5 5 4 4 4 A-weighting –26 –16 –9 –3 0 1 1 –1 Corrected level 6 21 30 33 34 38 35 33 Result: LpA2 = 42 dB(A) Specification is met. Case-radiated noise calculation procedure approx. 6 m approx. 6 m