Panasonic Aquarea WH-ADC0309J3E5 Planning And Installation Manual page 99

A rough determination of the sound pressure level L
heat pump can be calculated with the following formula and based on the sound power level L
L = L
Aeq WAeq
This only requires the direction factor Q in addition, which takes into account the spatial
propagation conditions of the sound source.
Direction factor Q for different arrangements of the sound source
Sound
propagation
Q =
Arrangement
Example
The outdoor unit WH-UX16HE8 of a T-CAP bi-bloc system has a sound power level of 67 dB(A)
and is set up such that the sound can propagate in the quarter space (Q = 4). The sound pressure
level at 10 m distance is then:
L (10 m) = 67 dB (A) + 10 × log
Aeq
At a distance of 20 m, the sound pressure level is however still only:
L (20 m) = 67 dB (A) + 10 × log
Aeq
The sound pressure level can roughly be calculated even more easily by using the table below, by
subtracting the table value from the device-specific sound power level (→
(bi-bloc systems), p.
Table for rough determination of the sound pressure level based on the sound power level
Guide factor Q
Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
( )
Q
+ 10 × log
4 × π × r²
In half space
(1 boundary: floor)
2
(
4 × π × 10²
(
4 × π × 20²
40, →
4.6.3.3 Technical Data (mono-bloc systems), p.
1
2 -8
4
-5
8
-2
at a certain location at a distance r to the
Aeq
In quarter space
(2 boundaries: floor + 1 wall)
4
)
4
= 42 dB (A)
)
4
= 36 dB (A)
Distance from the sound source (m)
2 4 5
-14 -20 -22
-11 -17 -19
-8 -14 -16
Planning
In eighth space
(3 boundaries: floor + 2 walls)
8
4.6.2.3 Technical Data
55).
6 8 10 12
-23.5 -26 -28 -29.5
-20.5 -23 -25 -26.5
-17.5 -20 -22 -23.5
:
Waeq
5
15
-31.5
-28.5
-25.5
99