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TRG-TRC007-EN 35
period three
Acoustical Analysis
notes
Sound can travel between a single source and the receiver along one or
multiple paths. In the case of an air-cooled chiller sitting on the roof of a
building, and a receiver located across a parking lot at the edge of the property,
sound travels along only one path.
Another example is a fan-coil unit installed under a window in an office. Sound
travels primarily along one path, from the fan-coil to the receiver in the same
room.
In other cases there may be several paths for sound to travel from a source
to the receiver. This particular example shows the paths associated with an
air handler that is installed in a mechanical equipment room adjacent to an
occupied space. Only one sound source is included in this analysis, the fan
located in the air handler. The receiver is the person working in the office.
The sound travels from the source to the receiver along four separate paths:
Examples of a Single Sound Path
fan
fan
-
-
coil
coil
air
air
-
-
cooled chiller
cooled chiller
Figure 39
Example of Multiple Sound Paths
wall transmission
wall transmission
return
return
airborne
airborne
supply
supply
airborne
airborne
supply
supply
breakout
breakout
1
1
2
2
3
3
4
4
source
source
Figure 40