Sound Level Attenuation Through A Noise Barrier - Sanyo SGP-E70J2GU2 User Manual

Design

(3) Sound level attenuation through a noise barrier

Sound attenuation of an outdoor unit at a reception point behind a noise barrier or building depends upon the
frequency and difference in path length.
δ:difference in path distance
δ=(A+B)-d
Example 1
Outdoor unit
Example 3
Outdoor unit
● The barrier should be positioned as close as possible to the
outdoor unit (sound source).(Figure 3)
(take care to ensure air intake and exhaust space, and service
and maintenance space)
● The barrier should be sufficiently higher than the top of the
outdoor unit (Figure 3).
(however, not more than 1m higher)
● The width of the barrier on both sides should be more than
several times the height. Where this is not possible then as
shown in Figure 4, the barrier should bend around the unit.
A
Outdoor unit
B
Sound
barrier
As close as possible (however, ensure intake and exhaust space
and service and maintenance space)
Fig. 3 Noise barrier
A
B
d
Reception point
Noise
barrier
A
B
d
Reception point
building
Effective area
1m or less
Example 2
Outdoor unit
Several
times
barrier
height
Sound reception
point
D - 24
6. Sound-proofing measures
A
d
B
building
Reception point
Reception
point
Sound
source
Sound path difference (m)
Fig. 2 Diffraction attenuation
Outdoor
the
Sound
barrier
Fig. 4 Noise barrier
When bent, longer than
this line