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