Panasonic Aquarea PAW-DHWM 80-120 ZNT Gebrauchsanweisung Seite 13

Rectangular elbow horizontal 90°
Flexible tube (DN125)
Air intake grid
Table 3: Example of pressure drop calculation
Note:
As mentioned above, the total loss of static pressure, which can be calculated by
adding up the losses of individual elements built into the pipeline system, may not
exceed 95 Pa. If they do, the values of COP start dropping more dramatically.
DETERMINING THE FAN SETTING
When pressure drop is determined, select the mode in which the fan will operate.
This determines the speed of the fan. The mode is selected using Diagram no. 1,
which shows the aerodynamic characteristics of the fan depending on the air flow and
pressure drop in the pipeline*.
Note:
*Pressure drop in the pipeline – in diagram 1 this is marked as pressure difference.
Zone of operation of the sanitary heat pump
On diagram 1 there are two zones of operation of the sanitary heat pump among the
curves:

The dark green zone represents the area of use with higher efficiency. The
volumetric air flow is higher in this zone, which requires a lower pressure drop
(channel system version with minimum pressure drop).

The light green zone represents the area of use with lower air flow in relation to the
pressure drop and fan setting.
Noise
Like the aerodynamic characteristics rise from the lowest to the highest, the noise
increases as well. Between the aerodynamic characteristics 80% and 100 % there is
a zone with increased noise.
Checking the calculation of pressure drop
Determining the aerodynamic characteristics based on the calculation of pressure
drop while taking into account individual elements of the pipeline and air flow is an
iteration. Once the aerodynamic characteristic has been determined and set, we must
measure the air flow in the pipeline. If the air flow does not correspond to the
ventilation system, we select the next higher or lower aerodynamic characteristic that
corresponds to the ventilation system.
Number of
elements
4
13.5
1
Total:
p (Pa) p (Pa)
5
1.85
3
(at 150 m /h)
25
20
25
25
70
13