GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Manage sound and vibration
Typical sounds and vibrations in systems can be
broken down into the following three categories:
• Sound radiation (through air)
• Mechanical vibrations (through parts and
structure)
• Gas pulsation (through refrigerant)
The following sections focus on the causes and
methods of mitigation for each of the above
sources.
Compressor sound
radiation
For sound radiating from the compressors,
the emission path is air and the sound waves
are travelling directly from the machine in all
directions.
Sound levels are as follows:
• For compressors running alone:
Compressor model
50 HZ 60 HZ
Acoustic hood
code number
Bottom insulation
code number
Sound power
dB(A)
Attenuation
dBA
Sound power
dB(A)
Attenuation
dBA
DSH090 73 6 76 6 120Z0034
Not Needed
DSH105 75 6 78 6 102Z0035
DSH120 75 6 78 6 120Z0035
DSH140 76 6 79 6 120Z0035
DSH161 76 6 79 6 120Z0035
DSH184 78 6 81 6 120Z0135
DSH240 82 6 86 4 120Z0022 120Z0353
DSH295 82 6 86 4 120Z0022 120Z0353
DSH381* 87 6 89 4 120Z0022 120Z0353
DSH485** 89 4 91 4 120Z0022 120Z0353
Sound power and attenuation are given at ARI conditions, measured in free space
* For DSH381code 3 use acoustic hood reference 120Z0579
**No acoustic hood available for DSH485 code 3
Attenuation given with acoustic hood
• For compressors running simultaneously,
- the global sound level of “n” identical compressors is:
L
GLOBAL
= Li + 10 Log
10
n
Example for the trio DSH720 = 3 x DSH240 (50Hz)
L
DSH240
= 82dB(A)
L
DSH720
= 82 + 10 Log
10
3 = 86.8dB(A)
Example for the tandem
DSH424 = DSH184+DSH240 (50Hz)
L
DSH184
= 78dB(A), L
DSH240
= 82dB(A)
L
DSH424
=10 Log
10
(10
0.1x78
+10
0.1x82
) = 83.5dB(A)
L
GLOBAL
= 10 Log
10
(∑ 10
0.1*Li
)
i=n
i=1
- the global sound level of “n” different compressors with respectively Li sound level is:
32 FRCC.PC.045.A7.02
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