Have you already heard of an evaporative cooler? It seems the most practical and economical solution for cooling rooms, when the fan is not enough and when you cannot or do not want to install an air conditioning system.
The evaporative cooler, evaporative fan or swamp cooler is a device for cooling the air in a natural way, without the use of refrigerant gasses or compressors, but equipped with a water tank to keep the filter humidified. The hot air is in fact drawn in, passes through this filter, and then evaporates, colder.
The evaporative cooler and the principle of adiabatic transformation
The operation of this device is based on the principle known in thermodynamics as adiabatic transformation, in which refrigeration takes place through the exchange of energy between water and air.
The technique, in fact, has been known since the times of the ancient Assyrians, who used it to cool their homes: the air can be cooled by water.
In an evaporative cooling system, therefore, the hot air is passed through humid filters by means of a motor fan. The filters, or cooling plates, are continuously moistened by a water tank. The air thus transfers part of its heat to the water, which evaporating, causes the lowering of the air temperature. The cooled air is then circulated again in the environment.
With this system, the outgoing air can then be cooled between 60 and 90%, depending on the effectiveness, even if it contains a high amount of humidity.
The advantages of an evaporative cooler
Surely this type of appliance cannot compete with an air conditioning unit, but if you have no special needs and just want to lower the temperature by a few degrees in fairly small rooms, this can become the optimal solution. In fact, its advantages are numerous:
- Low energy consumption
- It is easy to use and clean
- It can also be used with open doors and windows
- It has no gas or refrigerant fluids
- It can be easily moved from one room to another or to different homes
The disadvantages of an evaporative cooler
As anticipated, these devices do not reach the cooling levels of an air conditioner. Indeed:
- It does not allow precise temperature regulation
- Increases the level of humidity in the rooms, so at a certain point you can feel the heat more, making it less effective
- It requires an air change, so as not to saturate the environment with humidity
- It is almost useless in too large spaces
- After prolonged use and without proper maintenance, it can emit a bad smell.
However, it remains a product that can give relief and refreshment in the hottest periods or for limited periods of time. What do you think about it?
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