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Swirl Diffusers - 17 Pages
Example
Data given:
Type RFD-R-D-US/125
Volume flow per diffuser V = 24 l/s
Required: Octave band sound power level of regenerated
noise Lw
Diagram 1: Sound power level and pressure drop
LWA = 30 dB(A)
Apt = 22 Pa
Effective jet velocity veff:
V 24
veff = --- = -—- = 7.1 m/s
Aeff-1000 0.0034-1000
Octave band centre frequency in Hz | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
in dB(A) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
AL in dB | + 2 | - 1 | + 1 | + 0 | - 6 | - 12 | - 18 | -28 |
Lw in dB | 32 | 29 | 31 | 30 | 24 | 18 | 12 | 2 |
Correction to Diagram 1: Damper angle
1 Sound power level and pressure drop Size 125
Construction with discharge nozzle
7 10 l/s 15 20 30 40 60
30 40 m3/h 60 80 100 150 200
2 Sound power level and pressure drop Size 125
Construction without discharge nozzle
7 10 l/s 15 20 30 40 60
30 40 m3/h 60 80 100 150 200
Blade angle 0° 45° 90°
Ap, x1 x1.2 x2
Correction to Diagram 2: Damper angle | |
Blade angle | 0° 45° 90° |
A p, | x1 x1.1 x1.6 |
LWNC | |
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Contents • Description Description_ 2 Construction • Dimensions_ 3 Installation • Fixing_ 5 Materials_ 5 Nomenclature_... -
P. 3
Dependant on requirements of maximum volumetric flow, noise level and installation situation, swirl diffusers are available with or without discharge... -
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Construction • Dimensions The face section of the diffuser or side entry plenum box is demountable, held in position by a central fixing... -
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Installation • Fixing Because of their excellent performance, type RFD swirl diffusers can be installed flush with a continuous ceiling or freely... -
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Nomenclature · Quick Selection · Spectral Data·V·VA, BXH1vH1Nomenclaturein l/s:in m3/h:in m:in m:in m:in m/s:Lin m:vLͬ tZin m/s:in... -
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Acoustic Data Correction to Diagram 3: Damper angleBlade angle0°45°90°Ap,x 1x 1.2x2.4 + 1+ 3 + 1+ 3 Correction... -
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Acoustic Data Correction to Diagram 7: Damper angle Correction to Diagram 9: Damper angle Blade angle 0° ... -
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Acoustic DataExampleData given:·Volume flow per diffuserV = 30 l/sSupply air temperature differential ͬ t Z = – 8 KSound pressure level... -
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Air velocity at a distance 75 mm from the wall vL = 0.21 m/s L = X+H1 = 2.90 m L = A/2 + H1 = 2.90 m AtL/Atz = 0.019 At |_ = 0.019 x (-8)... -
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Aerodynamic Data RFD 160 Diagrams 17 to 20: Permitted volume flow ranges see Selection Table Page 6. Diagrams 17 to 20 are applicable to...
