Installation manual
146
5.2.3
Fig. 5.3: Reduction in sound pressure level for sound propagation with a hemispherical form
For example:
Sound pressure level at a distance of 1m: 50 dB(A)
Fig. 5.3 on p. 146 shows a reduction in the sound pressure level
of 11 dB(A) at a distance of 5 m.
Sound pressure level at a distance of 5 m:
50 db(A) – 11 db(A) = 39 db(A)
NOTE
Directional sound pressure levels are significant for heat pumps installed
outdoors (see Chap. 2.12 on p. 71).
Fig. 5.4: Sound directions for air-to-water heat pumps installed outdoors
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