Low Sound Solutions
Transcript of Low Sound Solutions
Specialists in Heat Transfer Products and Services
The The AAdvanced dvanced TTechnologyechnology Low Sound SolutionsLow Sound Solutions
CONFIDENTIALThis document is the property of EVAPCO, Inc.
It should not be copied or disclosed without prior written authorization.
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Same Great AT Features and Benefits
Low Energy Consumption
Low Sound Options
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
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CTI Test Code ATC-128 (currently in revision process)
Ensures sound data will be measured, evaluated and presented in the same manner. Specifies instrumentation and operating conditions. Defines measurement locations. Describes how to account for background noise in
data reduction. Once adopted, recommended for use in engineering
specifications
Sound Basics Sound Basics
SoundSound
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Measuring Sound Pressure Levels. It is important to be aware of testing tolerances. Variables:
Ambient Temperature and Humidity Wind Speed Background Noise Reflectivity Accuracy of Instrumentation
Sound BasicsSound Basics
SoundSound
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Uncertainty in Measuring Sound Pressure Levels.
Sound Basics Sound Basics
Octave Band Frequency Testing Tolerance* (dB)63 ± 5
125 ± 3250 ± 2500 ± 1.5
1000 ± 1.52000 ± 1.54000 ± 1.58000 ± 2.5
* per ISO standard 3744
SoundSound
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Rules of Thumb: Adding two identical sources results in a 3 dB(A) increase
Ex: 73 dB(A) + 73 dB(A) = 76 dB(A)
Sound Basics Sound Basics
SoundSound
!
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Rules of Thumb: Adding two identical sources results in a 3 dB(A) increase
Ex: 73 dB(A) + 73 dB(A) = 76 dB(A) ±1 dB(A) change in sound level is inaudible +10dB(A) sounds twice as loud Doubling far field distance from a point sound source results
in a 6 dB(A) reduction Ex: 73 dB(A) @ 50 ft (15m) = 67 dB(A) @ 100 ft (30m)
Sound BasicsSound Basics
SoundSound
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Features and BenefitsFeatures and Benefits
• Four options to reduce sound levels
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
EVAPCOEVAPCO®® Induced Draft Products are Induced Draft Products are thethe QuietestQuietest in the Industryin the Industry
– SUPER Low Sound Fan
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
9 to 15 dB(A) Reduction!SUPER Low Sound Fan –SUPER Low Sound Fan –
9 to 15 dB(A) Reduction!
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• Available on all 8.5’ cells• Adds 12” to 21” (330 to 530mm) to cell
height• One piece molded construction, heavy
duty FRP.
• Extremely wide chord blades• Unique forward swept blade profile• Reduced fan speed
• No thermal performance derate!
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
9 to 15 dB(A) Reduction!SUPER Low Sound Fan –SUPER Low Sound Fan –
Dimensional Impact
Construction
Thermal Performance
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
8 to 13 dB(A) Reduction!SUPER Low Sound Fan –SUPER Low Sound Fan –
Just BIGGER!
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Features and BenefitsFeatures and Benefits
• Four options to reduce sound levels– SUPER Low Sound Fan
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
EVAPCOEVAPCO®® Induced Draft Products are Induced Draft Products are thethe QuietestQuietest in the Industryin the Industry
– Low Sound Fan
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
4 to 7 dB(A) ReductionLow Sound Fan –Low Sound Fan –
4 to 7 dB(A) Reduction!
• Available on all 12’ (3.6m) and 14’ wide cells
• Add 7” (177mm) to overall unit height
• Wide chord fan blades• Aluminum
construction with steel fan hub
• No thermal performance derate!
Dimensional Impact
Construction
Thermal Performance
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Features and BenefitsFeatures and Benefits
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
EVAPCOEVAPCO®® Induced Draft Products are Induced Draft Products are thethe QuietestQuietest in the Industryin the Industry
– Discharge Attenuation
• Four options to reduce sound levels– SUPER Low Sound Fan– Low Sound Fan
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• Available on all standard AT products, except 4’ wide units
• Cannot be used with SUPER Low Sound Fan option
• Can be used with Low Sound Fan option
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Up to 10 dB(A) ReductionDischarge Attenuation –Discharge Attenuation –
Up to 10 dB(A) Reduction!
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• Straight sided discharge hood• Adds 55” (1400mm) to
standard unit height
• High density fiberglass insulated walls and low pressure drop baffling system
• Self supporting on unit
• Only 2% thermal performance derate
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Up to 10 dB(A) ReductionDischarge Attenuation –Discharge Attenuation –
Dimensional Impact
Construction
Thermal Performance
Specialists in Heat Transfer Products and Services
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
EVAPCOEVAPCO®® Induced Draft Products are Induced Draft Products are thethe QuietestQuietest in the Industryin the Industry
– Water Silencer
• Four options to reduce sound levels– SUPER Low Sound Fan– Low Sound Fan– Discharge Attenuation
Features and BenefitsFeatures and Benefits
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• Available on all standard AT products
• No dimensional impact
• Lightweight PVC • Easily removable sections
rest on steel supports• Located in the falling water
area of the cold water basin
• No thermal performance derate!
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
EVAPCO Water SilencersEVAPCO Water Silencers
Dimensional Impact
Construction
Thermal Performance
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
EVAPCO Water SilencersEVAPCO Water Silencers
Measured at 5 ft (1.5m) from air inletMeasured at 5 ft (1.5m) from air inlet
Fans at Full Speed 4 – 7 dB(A) reduction
Fans at Half Speed 7 – 10 dB(A) reduction
Fans Off 9 - 12 dB(A) reduction
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Octave Band Sound Analysis – 5ft. (1.5m) dataOctave Band Sound Analysis – 5ft. (1.5m) data
300 Ton Cooling Tower
Conditions: 900 gpm, 95/85/78(300 Nominal Tons)
Selection: (1) AT 19-6128.5’ x 12’ plan area(1) 20 HP Motor
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Octave Band Sound Analysis – 5ft. (1.5m) dataOctave Band Sound Analysis – 5ft. (1.5m) dataModel AT 19-612
Standard Sound Data
20 HP (15kW)BAND END SIDE TOP
63 Hz 78 78 80
125 Hz 81 81 86
250 Hz 81 81 86
500 Hz 75 76 80
1k Hz 72 73 75
2k Hz 69 71 73
4k Hz 72 72 71
8k Hz 73 73 68
dB(A) 80 81 83
Model AT 19-612
with Water Silencers
20 HP (15kW)BAND END SIDE TOP
63 Hz 78 78 80
125 Hz 81 81 86
250 Hz 81 81 86
500 Hz 74 76 80
1k Hz 67 70 75
2k Hz 62 66 73
4k Hz 63 64 71
8k Hz 64 65 68
dB(A) 76 77 83
80 – 76 = 4 dB(A)
72 – 63 = 9 dB
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Model AT 19-612
SUPER Low Sound Fan
20 HP (15kW)BAND END SIDE TOP
63 Hz 74 77 74
125 Hz 70 72 79
250 Hz 68 66 69
500 Hz 69 69 66
1k Hz 71 71 66
2k Hz 69 70 65
4k Hz 72 71 63
8k Hz 73 73 65
dB(A) 78 78 72
Model AT 19-612
Standard Sound Data
20 HP (15kW)BAND END SIDE TOP
63 Hz 78 78 80
125 Hz 81 81 86
250 Hz 81 81 86
500 Hz 75 76 80
1k Hz 72 73 75
2k Hz 69 71 73
4k Hz 72 72 71
8k Hz 73 73 68
dB(A) 80 81 83
Octave Band Sound Analysis – 5ft. (1.5m) dataOctave Band Sound Analysis – 5ft. (1.5m) data
83 – 72 = 11 dB(A)
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Model AT 19-612
SUPER Low Sound Fan
& Water Silencers
20 HP (15kW)BAND END SIDE TOP
63 Hz 74 73 74
125 Hz 70 76 79
250 Hz 68 69 69
500 Hz 63 68 65
1k Hz 63 67 65
2k Hz 61 65 64
4k Hz 63 63 62
8k Hz 64 65 63
dB(A) 70 73 72
Model AT 19-612
Standard Sound Data
20 HP (15kW)BAND END SIDE TOP
63 Hz 78 78 80
125 Hz 81 81 86
250 Hz 81 81 86
500 Hz 75 76 80
1k Hz 72 73 75
2k Hz 69 71 73
4k Hz 72 72 71
8k Hz 73 73 68
dB(A) 80 81 83
Octave Band Sound Analysis – 5ft. (1.5m) dataOctave Band Sound Analysis – 5ft. (1.5m) data
Specialists in Heat Transfer Products and Services
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Model AT 19-612
SUPER Low Sound Fan & Water Silencers
20 HP (15kW)BAND END SIDE TOP
63 Hz 74 73 74
125 Hz 70 76 79
250 Hz 68 69 69
500 Hz 63 68 65
1k Hz 63 67 65
2k Hz 61 65 64
4k Hz 63 63 62
8k Hz 64 65 63
dB(A) 70 73 72
Octave Band Sound Analysis – 5ft. (1.5m) dataOctave Band Sound Analysis – 5ft. (1.5m) dataInduced Draft
Brand “B”Induced Draft
EVAPCOModel 3333A/Q
Crossflow Unit with Low Sound Fan
20 HP (15kW)BAND END SIDE TOP
63 Hz 63 56 55
125 Hz 63 65 73
250 Hz 68 68 80
500 Hz 68 71 74
1k Hz 70 74 76
2k Hz 67 73 77
4k Hz 60 66 74
8k Hz 54 61 70
dB(A) 73 78 82
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Model LSTA 8P-125
Standard Sound Data
50 HP (37kW)BAND End Fan Side TOP
63 Hz 77 79 77
125 Hz 74 77 77
250 Hz 69 76 76
500 Hz 69 77 78
1k Hz 68 75 74
2k Hz 65 73 71
4k Hz 62 70 71
8k Hz 57 66 71
dB(A) 73 80 80
Model AT 19-612
SUPER Low Sound Fan & Water Silencers
20 HP (15kW)BAND END SIDE TOP
63 Hz 74 73 74
125 Hz 70 76 79
250 Hz 68 69 69
500 Hz 63 68 65
1k Hz 63 67 65
2k Hz 61 65 64
4k Hz 63 63 62
8k Hz 64 65 63
dB(A) 70 73 72
Octave Band Sound Analysis – 5ft. (1.5m) dataOctave Band Sound Analysis – 5ft. (1.5m) dataForced Draft Induced Draft
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Model LSTA 8P-125 @ 50HP
Unit Price with:
• Standard Product
Price (ex-factory) = $ 16,500
Model AT 19-612 @ 20HP
Unit Price with:
• Water Silencers
• SUPER Low Sound Fan
Price (ex-factory) = $ 18,000
Life Cycle Cost ComparisonLife Cycle Cost Comparison
$ 1,500
$ 7,050
Annual Energy Savings
Total Fan Power Cost / yr = $ 4700 Total Fan Power Cost / yr = $ 11,750
$0.09 / kWh and 3500 hours per year (40% usage rate)
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
SUPER Low Sound Fan(s):
Suggested Mechanical SpecificationSuggested Mechanical Specification
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Specify Sound Data 5’ above Fan Discharge at Full Speed
Suggested Mechanical SpecificationSuggested Mechanical Specification
Verification of Supplier Data
45°
5’
Microphone Position
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Specify Sound Data 5’ above Fan Discharge at Full Speed
Suggested Mechanical SpecificationSuggested Mechanical Specification
• Verification of Supplier Data
Specialists in Heat Transfer Products and Services
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Specify Sound Data 5’ above Fan Discharge at Full Speed
Suggested Mechanical SpecificationSuggested Mechanical Specification
45°5’
Verification of Supplier Data
5’
Not Here
Property Line
Not Here
Microphone Position
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Specify Sound Data 5’ above Fan Discharge at Full Speed
Suggested Mechanical SpecificationSuggested Mechanical Specification
• Verification of Supplier Data
• Sound Quality
• Sound Frequency
• Acoustical Shadow
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Suggested Mechanical SpecificationSuggested Mechanical Specification
Sound Quality• Sound Frequency
• Acoustical Shadow*
High FrequencySelf Attenuating
Not Here
Microphone Position
Low-Mid Frequencies
Specify Sound Data 5’ above Fan Discharge at Full Speed
Property Line
*Seelbach & Oran, What to do about Cooling Tower Noise, Industrial Acoustics Co., Inc., 1998.
Not Here
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Replacement Projects Consider EVAPCO Induced Draft AT Style Units First!
Low Energy Low Sound Simplified Maintenance
Retro-Fit ApplicationsRetro-Fit Applications
SoundSound
Replacement Sections / Retro-fits All Low Sound Solutions can be Retro-fitted
into existing EVAPCO Induced Draft Units!
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Success StorySuccess StorySuccess Story
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BACKGROUND:• 500,000 Sq.Ft. Office Building in Boston
•Noise related complaints from tenants – shaking windows •Building Owner hired sound consultant•Sound Consultant recommended 14 dB reduction in 250 and 500Hz octave bands
• Building owner contacted Evapco to inquire about possible solutions to address sound consultant recommendation.
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Success StorySuccess Story
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Two Cooling Towers: 8’x24’ and 8’x18’ - 4 Fans Total - 20 Hp EachTwo Cooling Towers: 8’x24’ and 8’x18’ - 4 Fans Total - 20 Hp Each
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Success StorySuccess Story
• Towers end to end
• Sound reflecting off the building walls and windows
BACKGROUND:
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SOLUTION:• EVAPCO proposed replacing the standard fans with
EVAPCO SUPER Low Sound Fans
• EVAPCO Guaranteed:• 18 dB sound reduction in 250 Hz Octave Band• 15 dB sound reduction in 500 Hz Octave Band
• Building owner loved the idea!•Requested identical replacement units withEVAPCO SUPER Low Sound Fans installed.
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Success StorySuccess Story
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• Independent sound consultant was hired to record “before” and “after” sound measurements to verify guaranteed reductions.
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
Success StorySuccess Story
Cerami & Associates – New York, NY
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RESULT:Cerami & Associates, Inc. Acoustical Engineers, Project # 14810Cerami & Associates, Inc. Acoustical Engineers, Project # 14810
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REDUCTION – 5ft Above Top
Tower: 8’x24’ 8’x18’
BAND 5 ft. 5 ft.
63 Hz 14 11
125 Hz 14 21
250 Hz 18 19
500 Hz 19 25
1k Hz 14 21
2k Hz 12 16
4k Hz 17 15
8k Hz 13 9
dB(A) 15 21
Success StorySuccess Story
INITIAL SOUND – 5ft Above Top
Tower: 8’x24’ 8’x18’
BAND 5 ft. 5 ft.
63 Hz 92 93
125 Hz 91 98
250 Hz 89 92
500 Hz 87 93
1k Hz 83 90
2k Hz 79 82
4k Hz 73 75
8k Hz 64 67
dB(A) 89 94
Specialists in Heat Transfer Products and Services
• Four options to reduce sound levels– SUPER Low Sound Fan– Low Sound Fan– Discharge Attenuation– Water Silencers
• Sound Reduction from the top, sides and ends
• No capacity derate in most cases• Low Energy• Overall sound pressure levels available in
EVAPCO’s selection software
AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS
EVAPCO® Induced Draft Products are the Quietest in the Industry
ConclusionsConclusions
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AAdvanced dvanced TTechnology LOW SOUND SOLUTIONSechnology LOW SOUND SOLUTIONS