radiator noise presentation - enoisecontrol · radiator noise control summary • use acoustical...
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![Page 1: Radiator Noise Presentation - eNoiseControl · Radiator Noise Control Summary • Use acoustical louvers or sound traps for a skid- mounted radiator, if space is available. • Consider](https://reader033.vdocument.in/reader033/viewer/2022041921/5e6c2cd121c83a47f6758d46/html5/thumbnails/1.jpg)
Mark E. Schaffer, P.E.
Schaffer Acoustics Inc.Pacific Palisades, CA
Genset Radiator Noise
Return to www.enoisecontrol.com
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Sample Municipal Code Limits
75 dBA75 dBAIndustrial
60 dBA65 dBACommercial
45 dBA55 dBAResidential
NighttimeDaytimeLand Use
Codes usually require compliance during testing,but not during emergency operation
ASHRAE TC 2.6
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Skid-Mounted Radiator
ASHRAE TC 2.6
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1500 KW GensetMechanical Noise
60
70
80
90
100
110
63 125 250 500 1000 2000 4000 8000
Octave Band Center Frequency in Hertz
L P @
15
met
ers
in d
B
Without Radiator, 89 dBA
With Radiator, 92 dBA
ASHRAE TC 2.6
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Acoustical Louver
Length4” – 12 “
Insertion Loss3 – 10 dBA
Pressure Drop∼0.25” w.g.@ 500 FPM
ASHRAE TC 2.6
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Lined Duct Transition
Length30” – 120“
Insertion Loss1 to 5 dBA
Pressure Drop0.0” w.g.
ASHRAE TC 2.6
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Sound Traps
Length30” – 120“
Insertion Loss10 to 40 dBA
Pressure Drop0.05” to 0.30” w.g.
@ 500 FPM
ASHRAE TC 2.6
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Typical Low Noise1.5 MW Genset Installation
118,000 CFM
GeneratorRad
10’ long, 236 ft2 face area
Intake AirSoundTraps
Disch.Air
SoundTraps
ASHRAE TC 2.6
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Low Noise Genset Installationwith Remote Radiator
40,000 CFM
Generator
10’ long,80 ft2 face area
IntakeAir
SoundTraps
Disch.Air
SoundTraps
Exh.Fan
ASHRAE TC 2.6
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Vertical CoreRemoteRadiator
Note narrowfan blades
ASHRAE TC 2.6
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Horizontal CoreRemote Radiator
ASHRAE TC 2.6
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Remote Radiator Installation
ASHRAE TC 2.6
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RemoteRadiator
Air InletView
Note widefan blades
ASHRAE TC 2.6
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Radiator Noise Levels
30
40
50
60
70
80
90
100
110
63 125 250 500 1000 2000 4000 8000
Octave Band Center Frequency in Hertz
L P @
15
met
ers
in d
B 84” Skid-mounted
64” Remote
81” Remote93” Remote
ASHRAE TC 2.6
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Fan Noise Level vs RPM
-20
-15
-10
-5
0
100 95 90 85 80 75 70 65 60 55 50
% of Full RPM
Rel
ativ
e Le
vel i
n d
B
ASHRAE TC 2.6
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Differential Costs ofRemote Radiator for 1500 KW
($25,000)($25,000)Radiator
$20,000$5000Room Ventilation
$62,000+$99,400Total
$10,000+---Radiator Piping
$32,000$94,400Sound traps
RemoteRadiator
Skid-MountedRadiator
ASHRAE TC 2.6
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Remote Radiator Benefits
• Smaller ventilation opening(1/2 to 2/3 smaller)
• Fewer or shorter sound traps(1/2 to 2/3 reduction)
• More space in generator room
• Option to select quiet radiator
• Option to locate radiator for lowest noiseexposure to noise-sensitive areas
ASHRAE TC 2.6
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Radiator Noise Control Summary
• Use acoustical louvers or sound traps for a skid-mounted radiator, if space is available.
• Consider remote radiator if space precludessound traps for skid-mounted radiator.
• Consider several remote radiator fan selections,weighing cost, location and size.
• Consider VFD fan motor for lower speed &lower noise during cooler nighttime ambient airconditions.
Return to www.enoisecontrol.com
ASHRAE TC 2.6