Features and technical data
12
1
AD14
AD20
Water drain
type
-
M
diameter (Ø)
mm
60
Humidifying panel
surface
m²
2,7
3,4
thickness
mm
100
saturation efficiency
%
89
87
sound power L
w
at maximum speed
dB(A)
94,0
90,0
at average speed
dB(A)
85,0
82,0
at minimum speed
dB(A)
80,0
77,0
sound pressure L
p
at 5 m
at maximum speed
dB(A)
72,0 (2)
68,0 (2)
at average speed
dB(A)
63,0 (2)
60,0 (2)
at minimum speed
dB(A)
58,0 (2)
55,0 (2)
Dimensions
width
mm
1150
1650
depth
mm
1150
height
mm
1050
Air delivery outlet
width
mm
600
1185
height
mm
600
590
Weight
weight
kg
67
120
in operation
kg
88
146
Electrical specifications
Power supply
voltage
V
230
type
-
single-phase
frequency
Hz
50
Electrical power absorption
nominal
kW
1,10
1,90
maximum power consumption
A
4,8
7,0
(1) Test conditions: outdoor temperature 33 °C, relative humidity 60%.
(2) Maximum sound pressure levels in free field, with directionality factor 2, obtained from the sound power level in compliance with standard EN ISO 9614.
1.6
SYSTEM OPERATION
1.6.1
Ventilation and cleaning of the room
The evaporative cooling system is a system that works dy-
namically and works on the basis of a natural principle: it
introduces large quantities of cooled external air into the
room and extracts the exhausted hot air through doors,
windows and other evacuation openings that are left
open.
The operating principle is very simple: if the system expels
all the introduced air, the system produces maximum ef-
ficiency, grants all the planned air renewals and cools the
environment under the design conditions.
It is also possible to have a slightly lower extract air flow
than the supplied one (but not less than 80%), which al-
lows the room to be kept slightly overpressurised com-
pared to the outside, preventing the outside hot air from
re-entering the room through the natural openings.
The ideal condition is to place the air diffusers away from
the openings (windows, doors, etc.) and distribute them
evenly inside the room. By opening a window away from
the diffusers, the air passes through the room cooling it
before being extracted. By calculating the correct dimen-
sions of the evacuation openings the maximum efficiency
of the system is reached. The system must be able to ex-
tract the large volume of air supplied so as not to reduce
the effectiveness of the system.
If the available openings are not sufficient, it is necessary
to add forced air extraction systems (extraction towers).
Failure to comply with these conditions precludes the
planned air renewal, reduces the cooling effect and in-
creases the relative humidity inside the room.
To extract the exhaust air, natural openings of about 1 m
2
per 1000 m
3
of air are required.
1.6.2
Performances of the system
the system increases its air cooling capacity as the relative
humidity of the outside air decreases: the drier the fresh
outside air is, the higher the possibility of saturation, the
higher the reduction of the sensible heat contained in it,
therefore the greater the achievable decrease in the air
temperature.
The AD evaporative cooler is equipped with a high satu-
ration efficiency evaporating unit which produces a good
level of cooling even at relative air humidity values of
around 70%.
In areas with high humidity, the cooler must be oversized
to ensure improved air renewal, so as to compensate for
the smaller temperature difference. In these areas, maxi-
mum cooling will be achieved by ensuring that there are
the correct air changes and that the unit is put into oper-
ation early in the morning to stop the increase of latent
heat within the cooled space. In the design phase, howev-
er, it is advisable to consider the local climatic conditions.
On days when the external relative humidity rate is close
to or higher than 70÷75%, it is advisable to operate the
unit in ventilation mode only.
The cooling efficiency is not only related to the efficiency
of the appliance, but also to the design of the ductwork
and the installation. Insulated ceilings will decrease the
internal temperature significantly compared to non-in-
sulated ceilings. The same concept is applicable for air
ducting.
