HVAC Systems and Applications! - Resources, Tools and Basic Information for Engineering and Design.
Noise and sound calculation in HVAC systems ...
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A procedure for acoustic calculation of noise in ventilation systems
The logarithmic decibel scale is convenient when calculating resulting sound power levels and sound pressure levels for two or more sound or noise sources.
Noise can be eliminated with reactive silencers, diffuser type silencers, active silencers and/or dissipative silencers
Decibel is a logarithmic unit used to describe the ratio of the signal level - power, sound pressure, voltage, intensity, etc.
The sound pressure is not equally sensed by the human ear at different frequencies. This can be compensated with the dB(A), dB(B) or dB(C) filters.
The attenuation in a room depends on the receiver and source location.
The Sound Power Level from fans depends on the motor power and the capacity of the fan - the static pressure and/or the discharged volume.
An introduction to Noise Rating - NR - curves - developed by the International Organization for Standardization (ISO)
Calculate the attenuation in decibels in an outdoor free field.
An online Noise Criterion - NC - Calculator
An online Noise Rating - NR - Calculator
Convert between sound level, sound pressure and sound intensity.
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Outdoor ambient sound level in different rural and urban business and industrial environments with or without limited traffic.
Sound and noise in a room will reach the receiver as direct and reverberant sound.
Outdoor propagation of sound - distance and attenuation.
The transmission of sound through and around outdoor barriers.
Mean absorption coefficients and reverberation times for some typical rooms.
An online acoustic calculator for estimating the reverberation time and designing the acoustics of rooms
Sound absorption coefficients for some common materials as plaster walls, brickwork, plywood panels etc.
Estimation of sound attenuation when ducts are split to terminals
Sound attenuation for main ducts to branches.
Some of the low frequency noise transferred to the end terminals in a ventilation system, reflects back to the duct.
Attenuation in duct elbows is caused by reflected sound. It is only in big ducts and at high frequencies the attenuation is considerable.
Attenuation of sound in unlined sheet-metal ducts
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Sound attenuation in rectangular straight, lined, sheet metal ducts.
An introduction to the nature of sound with frequency, wavelength and octaves.
The sound intensity level is the acoustic power of a sound per unit of area in relation to a fixed reference.
The definition of Sound Power Level and the Sound Power from some common sources as fans, jet engines, cars, humans ....
An introduction to decibel, sound power, sound intensity and sound pressure
The Sound Pressure is the force of sound on a surface area perpendicular to the direction of the sound.
Maximum recommended sound pressure levels in rooms with activities as kindergartens, auditoriums, libraries, cinemas and ...
Estimating sound transmission from a duct to the surrounding room.
Noise and sound transmitted through duct walls, through floors or through ceilings
Calculation formulas for the speed of sound in gases, fluids and solids.
An online Speed of Sound calculator for air
Velocity of sound in common fluids as water, glycerol, kerosene ...
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Velocity of sound in some common solids as aluminum, brass, concrete and ...
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