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TRG-TRC007-EN 63
notes
We will now review the main concepts that were covered in this clinic on the
fundamentals of HVAC acoustics.
Period One explained some of the basic concepts of sound. Sound is the
audible emissions resulting from the vibration of molecules within an elastic
medium. It is generated at many different frequencies at the same time. Noise
is defined as unwanted, or obtrusive, sound.
Sound power and sound pressure are both terms that are used when describing
sound. Sound power is the acoustical energy emitted by the sound source and
is not affected by the environment. Sound pressure is a disturbance in the
atmosphere and can be measured directly. Its intensity is influenced not only by
the strength of the source, but also by the surroundings and the distance from
the source to the listener. Sound pressure is what our ears hear and what sound
meters measure.
period five
Review
Fundamentals of HVAC Acoustics
Figure 68
Review—Period One
I Sound power
K Acoustical energy emitted by source
K Unaffected by the environment
K Correlates to bulb wattage
I Sound pressure
K Pressure disturbance in atmosphere
K Affected by strength of source,
surroundings, and distance from source
K Correlates to brightness in a particular
location
Figure 69
period five
Review