Publicité
Les langues disponibles
Les langues disponibles
Ventilate: the thermal sensation of the air that surrounds us depends on its
speed. That is, a current of air gives us a lower sensation of temperature than
calm air.
air speed
m/s
8
9
10
11
12
That is why on many occasions a simple fan is capable of relieving us from the
sensation of heat. But, what if in addition to moving the air, we managed to cool
it? This is exactly what an evaporative cooler does! Ventilate and cool the air
through evaporative cooling.
1.3 EVAPORATIVE COOLING.
higher
temperature
minor
humidity
Evaporative air conditioners use the natural principle of water evaporation to
produce fresh air: dry air naturally decreases its temperature if we increase its
humidity. This phenomenon is the same that occurs, for example, on the shores
of the sea or a river, where the wind that comes into contact with the water
becomes a breeze capable of refreshing us.
This principle is very interesting because it is not necessary to spend energy to
humidify the air, but rather it is something that we can achieve naturally, and
this makes the energy consumption of an evaporative cooler equivalent to that
of a fan.
Evaporative coolers work by passing a flow of air through cooling filters, which
are soaked with water and the air captures moisture and reduces its tempera-
ture as it passes through them. They convert hot, dry air into cooler, more
humid air. In addition, the fact that they filter the air serves to purify the envi-
ronment and improve air quality.
Sensation of perceived temperature as a function of air speed.
Air temperature (ºC)
25
26
Equivalent temperature (ºC)
22.1
23.5
24.7
22.1
23.5
24.7
22.0
23.3
24.5
22.0
23.2
24.5
21.9
23.1
24.3
air
hot
dry
27
28
29
26.5
27.8
26.5
27.8
26.2
27.4
26.2
27.4
26.0
27.2
air
water
cool
wet
03
30
31
32
29.2
29.8
32.2
29.2
29.8
32.1
29.0
29.6
31.0
29.0
29.6
31.0
28.8
29.4
30.6
lower
temperature
elderly
humidity
Publicité
