Sound and vibration data
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 for compressors running alone as follows:
Table 9: Compressor sound radiation
Compressor model
50 Hz
60 Hz
Acoustic hood code no.
Sound power, dB(A)
Attenuation, dB(A)
Sound power, dB(A)
Sound power, dB(A)
DSF090
74
4
77
4
Body 120Z0490
Top 120Z0493
DSF100
76
4
79
4
Body 120Z0490
Top 120Z0493
DSF115-175
78
4
81
5
Body 120Z0491
Top 120Z0493
DSF200
80
5
83
6
Body 120Z0492
Top 120Z0493
DSF270
83
4
86
4
120Z0768
DSF325
83
4
86
4
DSF485
89
4
92
4
DSF530
89
4
92
4
NOTE:
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
GLOBAL
= Li + 10 Log
10
n
Example for the trio
DSF810T = 3 × DSF270
L
DSF270
= 83dB(A)
L
DSF810T
= 83 + 10 Log
10
3 = 87 . 8dB(A)
The global sound level of “n” different compressors with respectively Li sound level is:
L
GLOBAL
= 10
i = 1
i = n
log
10
(
∑
10
0.1
∗
Li)
Example for the tandem
DSF1180T = DSF530
L
DSF325
= 83dB(A), L
DSF530
= 89dB(A)
L
DSF1180T
=10 Log
10
(10
0 . 1×83
+ 10
0 . 1×83
+ 10
0 . 1×89
) = 90 . 8 dB(A)
Scroll compressors, DSF090 to DSF530 | Sound and vibration data
© Danfoss | Climate Solutions | 2023.06
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