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32 TRG-TRC007-EN
notes
period three
Acoustical Analysis
Source–Path–Receiver Analysis
Achieving the desired acoustical characteristics in a space, however, requires
more than selecting an appropriate single-number descriptor. Including a
single-number descriptor in a HVAC system specification means that someone
must perform an acoustical analysis to determine if the proposed HVAC system
and equipment will satisfy the space acoustical requirements. To make such a
prediction, the analysis must convert the sound-power level of the source (the
fan in the air handler in this example) to the sound-pressure level in the
occupied space, assessing the effect of installation and environmental factors
along the way.
Sound that reaches the occupied space will be altered by ductwork, wall and
ceiling construction, room furnishings, and many other factors. The validity
of an acoustical analysis, therefore, depends on the analyst’s familiarity with
construction details.
Acoustical Analysis
air handler
(source)
air handler
air handler
(source)
(source)
ductworkductwork
ductwork
diffuserdiffuser
diffuser
occupied space
(receiver)
occupied space
occupied space
(receiver)
(receiver)
VAV boxVAV box
VAV box
Figure 36