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TRG-TRC007-EN 55
period four
Equipment Sound Rating
notes
The most common test method for HVAC equipment is the reverberant-room
method. The objective of a reverberant room is to create a uniform, or diffuse,
sound field by reflecting and mixing the sound waves. The walls, floor, and
ceiling of the reverberant room are hard, in order to cause multiple reflections
of sound waves. In this environment, the sound pressure is essentially the same
at all locations within the room.
Sound-pressure levels are measured in the reverberant room and used to
calculate sound-power levels for the piece of equipment. The reverberant-room
method is commonly used to determine the sound power of fans, air handlers,
compressors, in-room air conditioners, terminal equipment (such as fan-coils
and VAV boxes), and diffusers.
Reverberant-Room Method
Figure 60