DSH720 = 3 × DSH240 (50 Hz)
L
DSH240
= 82dB(A)
L
DSH720
= 82 + 10 Log
10
3 = 86 . 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
DSH424 = DSH240 (50 Hz)
L
DSH184
= 78dB(A), L
DSH240
= 82dB(A)
L
DSH424
=10 Log
10
(10
0 . 1×78
+ 10
0 . 1×82
) = 83 . 5dB(A)
Mechanical vibrations
A compressor generates some vibrations that propagate into the surrounding parts and structure. The vibration
level of a DSH compressor alone does not exceed 120µm peak to peak for DSH090 to DSH184, and 154µm peak to
peak for DSH240 to DSH600. However, when system structure natural frequencies are close to running frequency,
vibrations are amplified due to resonance phenomenon.
A high vibration level is damageable for piping reliability and generates high sound levels.
© Danfoss | Climate Solutions | 2022.10
AB288965961751en-001402 | 17
Scroll compressors, DSH090 to DSH600 | Sound and vibration data
