Fundamentals of HVAC Acoustics
Air Conditioning Clinic
One of the Fundamental Series
TRG-TRC007-EN
BUSINESS REPLY MAIL
BUSINESS REPLY MAIL
TRANE Attn Applications Engineering
3600 Pammel Creek Road La Crosse WI
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Fundamentals of HVAC
Acoustics
Trane, an American Standard Company
One of the Fundamental Series A publication of
Fundamentals of HVAC Acoustics
Fundamentals of HVAC Acoustics
Preface
A Trane Air Conditioning Clinic
period two Sound Perception and Rating Methods
Contents
period three
period five
TRG-TRC007-EN
Fundamentals of Sound
period one
Fundamentals of Sound
period one
period one
What is Sound?
What is Sound?
Fundamentals of Sound
Fundamentals of Sound
Sound Wave and Frequency
period one
Fundamentals of Sound
Wavelength
period one
Broadband Sound and Tones
Broadband Sound
Fundamentals of Sound
period one
Fundamentals of Sound
Octave Bands
period one
Octave Bands
period one
Fundamentals of Sound
Octave Bands
Octave bands compress the range of frequencies between the upper and lower ends of the band into a single value. Sound measured in an octave band is the logarithmic sum of the sound level at each of the frequencies within the band
Fundamentals of Sound
One-ThirdOctave Bands
period one
Sound Power and Sound Pressure
Sound Power and Sound Pressure
Fundamentals of Sound
period one
Fundamentals of Sound
An Analogy
period one
K Correlates to bulb wattage
Decibel
dB = 10 log10
Fundamentals of Sound
period one
Fundamentals of Sound
Logarithmic Scale
period one
ratio
= 10 log10
Equation for Sound Power
= 20 log10
Equation for Sound Pressure
50 dB + 44 dB = 51 dB
Logarithmic Addition of Decibels
Fundamentals of Sound
period one
Sound Perception and Rating Methods
period two
Sound Perception and Rating Methods
period two
Loudness Contours
period two
Sound Perception and Rating Methods
Single-NumberRating Methods
Response to Tones
Sound Perception and Rating Methods
period two
Sound Perception and Rating Methods
A-B-CWeighting
period two
Sound Perception and Rating Methods
A-WeightingExample
period two
Sound Perception and Rating Methods
A-Weighting
period two
Sound Perception and Rating Methods
Noise Criteria NC Curves
period two
period two
Sound Perception and Rating Methods
Noise Criteria NC Curves
NC-39
Sound Perception and Rating Methods
Room Criteria RC Curves
period two
period two
Sound Perception and Rating Methods
Room Criteria RC Curves
dB ref
period two
Sound Perception and Rating Methods
nPerceptible vibration RV The sound level in the octave bands between 16 Hz and 63 Hz falls in the shaded regions A and B. These regions indicate sound-pressurelevels at which walls and ceilings can vibrate perceptibly-rattlingcabinet doors, pictures, ceiling fixtures, and other furnishings in contact with them
period two
Sound Perception and Rating Methods
Room Criteria RC Curves
RC-31R
Sound Perception and Rating Methods
Phon and Sone
period two
Sound Perception and Rating Methods
Octave-BandRating Method
period two
Octave-BandRating Method
Acoustical Analysis
period three
Acoustical Analysis
period three
period three
Setting a Design Goal
Setting a Design Goal
Acoustical Analysis
When defining the acoustical design goal for an outdoor environment, to meet a local noise ordinance for example, the A-weightedscale is typically used. This generally takes the form of a maximum A-weighted sound-pressurelevel at the lot line of the property
Setting a Design Goal
Acoustical Analysis
period three
Acoustical Analysis
Acoustical Analysis
period three
Source-Path-ReceiverAnalysis
Acoustical Analysis
Source-Path-ReceiverModel
period three
Acoustical Analysis
Typical Sound Paths
period three
IAirborne
Example of Multiple Sound Paths
Examples of a Single Sound Path
Acoustical Analysis
period three
Acoustical Analysis
Identifying Sound Sources and Paths
period three
packaged rooftop air conditioner
Acoustical Analysis
Modeling Sound Paths
period three
Sound-PathModeling
period three
Acoustical Analysis
Example of Multiple Sound Paths
supply
Acoustical Analysis
Algorithms for Sound-PathModeling
period three
Acoustical Analysis
Computerized Analysis Tools
period three
Acoustical Analysis
Attenuation and Regeneration
period three
Terms Used in Sound-PathModeling
Acoustical Analysis
Sound Transmission
period three
period three
Acoustical Analysis
Sound Transmission
IInsertion loss IL INoise reduction NR
Acoustical Analysis
Absorption
period three
Acoustical Analysis
Reflected Sound
period three
Acoustical Analysis
Receiver Sound Correction
period three
Equipment Sound Rating
period four
Equipment Sound Rating
period four
Free Field
period four
Equipment Sound Rating
Fields of Measurement
20 log10
= Lp1
Distance Correction in a Free Field
Equipment Sound Rating
period four
Equipment Sound Rating
Distance Correction in a Free Field
Lp2 = 95 dB - 20 log10 120 ft / 30 ft = 83 dB
Equipment Sound Rating
Near Field
period four
Equipment Sound Rating
Reverberant Field
period four
source reflective walls
Equipment Sound Rating
Semireverberant Field
period four
Equipment Sound Rating
Rating HVAC Equipment
period four
HVAC Equipment Sound Rating
Equipment Sound Rating
Reverberant-RoomMethod
period four
Equipment Sound Rating
Free-FieldMethod
period four
Equipment Sound Rating
Industry Standards
period four
Equipment Sound Rating
Ducted Air-HandlingEquipment
period four
supply-airoutlet
Equipment Sound Rating
Air Handler Test Configurations
period four
Equipment Sound Rating
Former Methods of Sound Testing
period four
I ASHRAE generic fan algorithm
Equipment Sound Rating
ARI Standard
period four
IUses reverberant- room method
Equipment Sound Rating
Sound Power by Octave Band
period four
1 2 3
Review
period five
Review
period five
Review-PeriodTwo
period five
Review
TRG-TRC007-EN
Review
Review-PeriodThree
period five
Review
Review-PeriodFour
period five
period five
Review
nTrane Acoustics Program TAP
Questions for Period
Quiz
Questions for Period
Questions for Period
Quiz
Questions for Period
7True or False Sound can only travel from a source to the receiver along one path
Answers
Glossary
hertz Hz The unit of measure for frequency. One hertz is equal to one cycle per second
Glossary
reverberant field A uniform, or diffuse, sound field that is the opposite of a free field. In a perfectly reverberant field, the sound-pressurelevel is equal at all points
Glossary
the receiver, and everything it encounters as it travels along the way, constitutes the path
Glossary
TRG-TRC007-EN
Literature Order Number
File Number
E/AV-FND-TRG-TRC007-1101-EN