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Manage sound and vibration
Compressor sound
radiation
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)
For sound radiating from the compressors,
the emission path is air and the sound waves
are travelling directly from the machine in all
directions.
Compressor model
DSF090
DSF100
DSF115-175
DSF200
Sound power and attenuation are given at ARI conditions, measured in free space
• For compressors running simultaneously,
- the global sound level of "n" identical compressors is:
L
= Li + 10 Log
n
GLOBAL
10
Example for the trio DSF465T = 3 x DSF155 (50 Hz)
L
= 78dB(A)
DSF155
L
= 78 + 10 Log
3 = 82.8dB(A)
DSF465T
10
- the global sound level of "n" different compressors with respectively Li sound level is:
i=n
0.1*Li
L
= 10 Log
(∑ 10
)
GLOBAL
10
i=1
Example for the tandem
DSF285U = DSF130+DSF155 (50 Hz)
L
= 78dB(A), L
= 78dB(A)
DSF130
DSF155
0.1x78
0.1x78
L
=10 Log
(10
+10
DSF285U
10
Model
DSF180E
DSF200E
DSF230E
DSF260E
DSF215U
DSF230U
DSF255U
DSF275U
DSF285U
DSF300U
DSF305U
Tandem
DSF310E
DSF315U
DSF331U
DSF350E
DSF400E
DSF330U
DSF355U
DSF375U
DSF400X
DSF500X
DSF470X
DSF525X
DSF465T
Trio
DSF525T
DSF600T
• Gas pulsation (through refrigerant)
The following sections focus on the causes and
methods of mitigation for each of the above
sources.
Sound levels are as follows:
• For compressors running alone:
50 H
Z
Sound power
dB(A)
74
76
78
80
) = 81dB(A)
Composition
DSF090+DSF090
DSF100+DSF100
DSF115+DSF115
DSF130+DSF130
DSF100+DSF115
DSF100+DSF130
DSF100+DSF155
DSF100+DSF175
DSF130+DSF155
DSF100+DSF200
DSF130+DSF175
DSF155+DSF155
DSF115+DSF200
DSF130+DSF200
DSF175+DSF175
DSF200+DSF200
DSF155+DSF175
DSF155+DSF200
DSF175+DSF200
DSF130+DSF270
DSH175+DSH325
DSH200+DSH270
DSH200+DSH325
DSF155 trio
DSF175 trio
DSF200 trio
60 H
Z
Sound power
dB(A)
77
79
81
83
Sound power dB(A)
50Hz
60Hz
77
80
79
82
81
84
81
84
80
83
80
83
80
83
80
83
81
84
81.4
84.4
81
84
81
84
82
85
82.1
85.1
81
84
83
86
81
84
82.1
85.1
82.1
85.1
84.2
87.2
84.2
87.2
84.8
87.8
84.8
87.8
82.8
85.8
82.8
85.8
84.8
87.8
AB367332784529en-000101
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