Evaporative cooling (also called adiabatic cooling in some cases) whose beneficial effects are used with increasing frequency for the cooling of medium and large buildings, is based on a simple physical principle known for hundreds of years and used in different forms and systems already in antiquity.
The advent of Gas Fitting Penrith technology, the availability of more ductile and resistant materials and above all the introduction of electronics has allowed the development of increasingly practical and efficient equipment to make best use of this physical principle which provides cooling as a whole natural, that is, that does not use any refrigerant, with very low energy consumption, requiring only very little electricity (necessary for the operation of a simple fan and a small water distribution pump).
Operating principle of the evaporative cooler. vaporative cooling uses one of the physical properties of air which, as is known, is able to absorb, and therefore contain, a certain amount of water vapor (water) depending on its temperature. The ratio between the actual quantity of water vapor contained in a given moment and the maximum value that it can contain, defines the% (percentage) of relative humidity (U.R.) of the air in question. The more the air is dry and the more water vapor it is able to absorb.
The more it is moist, the less it is able to receive more. The absolute amount of water vapor that the air can contain depends on its temperature: the warmer the air the more it is able to take on water vapor and vice versa. This physical characteristic of air is clearly expressed in the psychrometric diagram (Fig. 1) which shows the different conditions and typical characteristics of humid air.
Evaporative cooling allows you to add to the air the amount of missing water vapor to make it saturated (or very close to saturation), ie with a humidity close to 100%. If an air volume has a low relative humidity (% of U.R.), it means that, if properly treated, it can absorb more water up to 90/95% of U.R. The absorption of water vapor by the air is possible thanks to Gas Fitting Penrith and the heat contained in the air, which makes it possible to evaporate a certain amount of water that turns into water vapor.
This evaporation heat is taken from the same air, which therefore increases its% of U.R. while losing part of its heat, and therefore lowering its temperature. In energy terms the reduction of air temperature does not lead to a change in the enthalpy content of the air, since the reduction of sensitive energy (air temperature) is compensated with the increase in contained water vapor (hence the concept of adiabatic cooling, that is, without modifying the enthalpy content of the fluid in question).
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