Evaporative cooling. What does it mean?

Evaporative cooling is a process of  decreasing outside temperature due to a fine spraying of  tiny drops of water.

This process of  decreasing temperature takes place because through evaporation, water absorbs the heat of the environment.

Why does this phenomenon take place?

According to physics law, for 1 gram of water to change its state from liquid to gas it takes about 600 calories, more exactly 2260 Joules.

This is the necessary energy in the process of evaporation. This phenomenon is widely used in nature by animals including people in a process

called perspiration in order to adjust their body temperature.

What are the determining factors?

-          outside temperature: the hotter outside, the cooler inside

-          relative air humidity : the drier is air outside the same thing is cooler inside

-          the size of water drops sprayed in the air : the smaller are the drops the better

-          the amount of  sprayed water : more water is better cooling.

-          air flow

How much can the air be cooled and under what conditions?

Theoretically, in ideal conditions, air temperature can be dropped to over 20 degrees Celsius. These ideal conditions mean hot and very dry air, having a relative humidity close to 0.

Practically taking into account weather condition in our country, it is possible to gain a drop of temperature between 7 – 12 degrees Celsius. More precisely in a

hot summer day, at a temperature of 35 degrees Celsius and a relative humidity of 55%, a drop of 8,5 degrees Celsius can be gained.

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