TRG-TRC007-EN
Air Conditioning Clinic
Fundamentals of HVAC Acoustics
One of the Fundamental Series
3600 Pammel Creek Road La Crosse WI
BUSINESS REPLY MAIL
BUSINESS REPLY MAIL
TRANE Attn Applications Engineering
Acoustics
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Fundamentals of HVAC
One of the Fundamental Series A publication of
Trane, an American Standard Company
Fundamentals of HVAC Acoustics
Preface
Fundamentals of HVAC Acoustics
A Trane Air Conditioning Clinic
period five
Contents
period two Sound Perception and Rating Methods
period three
TRG-TRC007-EN
period one
period one
Fundamentals of Sound
Fundamentals of Sound
Fundamentals of Sound
What is Sound?
period one
What is Sound?
Sound Wave and Frequency
Fundamentals of Sound
period one
Wavelength
Fundamentals of Sound
period one
period one
Broadband Sound
Broadband Sound and Tones
Fundamentals of Sound
Octave Bands
Octave Bands
Fundamentals of Sound
period one
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
period one
Octave Bands
One-ThirdOctave Bands
Fundamentals of Sound
period one
period one
Sound Power and Sound Pressure
Sound Power and Sound Pressure
Fundamentals of Sound
K Correlates to bulb wattage
An Analogy
Fundamentals of Sound
period one
period one
dB = 10 log10
Decibel
Fundamentals of Sound
ratio
Logarithmic Scale
Fundamentals of Sound
period one
Equation for Sound Pressure
Equation for Sound Power
= 10 log10
= 20 log10
period one
Logarithmic Addition of Decibels
50 dB + 44 dB = 51 dB
Fundamentals of Sound
period two
period two
Sound Perception and Rating Methods
Sound Perception and Rating Methods
period two
Loudness Contours
Sound Perception and Rating Methods
period two
Response to Tones
Single-NumberRating Methods
Sound Perception and Rating Methods
A-B-CWeighting
Sound Perception and Rating Methods
period two
A-WeightingExample
Sound Perception and Rating Methods
period two
A-Weighting
Sound Perception and Rating Methods
period two
Noise Criteria NC Curves
Sound Perception and Rating Methods
period two
NC-39
Sound Perception and Rating Methods
period two
Noise Criteria NC Curves
Room Criteria RC Curves
Sound Perception and Rating Methods
period two
dB ref
Sound Perception and Rating Methods
period two
Room Criteria RC Curves
Sound Perception and Rating Methods
period two
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
RC-31R
Sound Perception and Rating Methods
period two
Room Criteria RC Curves
Phon and Sone
Sound Perception and Rating Methods
period two
Octave-BandRating Method
Octave-BandRating Method
Sound Perception and Rating Methods
period two
period three
period three
Acoustical Analysis
Acoustical Analysis
Acoustical Analysis
Setting a Design Goal
period three
Setting a Design Goal
period three
Setting a Design Goal
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
Acoustical Analysis
Source-Path-ReceiverAnalysis
Acoustical Analysis
Acoustical Analysis
period three
Source-Path-ReceiverModel
Acoustical Analysis
period three
IAirborne
Typical Sound Paths
Acoustical Analysis
period three
period three
Examples of a Single Sound Path
Example of Multiple Sound Paths
Acoustical Analysis
packaged rooftop air conditioner
Identifying Sound Sources and Paths
Acoustical Analysis
period three
Sound-PathModeling
Modeling Sound Paths
Acoustical Analysis
period three
supply
Acoustical Analysis
period three
Example of Multiple Sound Paths
Algorithms for Sound-PathModeling
Acoustical Analysis
period three
Computerized Analysis Tools
Acoustical Analysis
period three
Terms Used in Sound-PathModeling
Attenuation and Regeneration
Acoustical Analysis
period three
Sound Transmission
Acoustical Analysis
period three
IInsertion loss IL INoise reduction NR
Acoustical Analysis
period three
Sound Transmission
Absorption
Acoustical Analysis
period three
Reflected Sound
Acoustical Analysis
period three
Receiver Sound Correction
Acoustical Analysis
period three
period four
period four
Equipment Sound Rating
Equipment Sound Rating
Fields of Measurement
period four
Free Field
Equipment Sound Rating
Equipment Sound Rating
= Lp1
20 log10
Distance Correction in a Free Field
Lp2 = 95 dB - 20 log10 120 ft / 30 ft = 83 dB
Equipment Sound Rating
period four
Distance Correction in a Free Field
Near Field
Equipment Sound Rating
period four
source reflective walls
Reverberant Field
Equipment Sound Rating
period four
Semireverberant Field
Equipment Sound Rating
period four
HVAC Equipment Sound Rating
Rating HVAC Equipment
Equipment Sound Rating
period four
Reverberant-RoomMethod
Equipment Sound Rating
period four
Free-FieldMethod
Equipment Sound Rating
period four
Industry Standards
Equipment Sound Rating
period four
supply-airoutlet
Ducted Air-HandlingEquipment
Equipment Sound Rating
period four
Air Handler Test Configurations
Equipment Sound Rating
period four
I ASHRAE generic fan algorithm
Former Methods of Sound Testing
Equipment Sound Rating
period four
IUses reverberant- room method
ARI Standard
Equipment Sound Rating
period four
1 2 3
Sound Power by Octave Band
Equipment Sound Rating
period four
period five
period five
Review
Review
TRG-TRC007-EN
period five
Review-PeriodTwo
Review
Review-PeriodThree
Review
period five
Review-PeriodFour
Review
period five
Review
period five
nTrane Acoustics Program TAP
Quiz
Questions for Period
Questions for Period
7True or False Sound can only travel from a source to the receiver along one path
Quiz
Questions for Period
Questions for Period
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
E/AV-FND-TRG-TRC007-1101-EN
Literature Order Number
TRG-TRC007-EN
File Number