Evaporative cooling uses the power of evaporation to cool the air. Hot and dry air from outside is drawn through cooling pads soaked in water. The water evaporates as the air passes through the pads. This heat absorbs, which reduces the temperature. The cool air is then pushed through ducts by a fan.
Evaporative cooling works best when all cooling pads are fully saturated. The fan and motor must be sized to provide the right airflow to the area. Evaporative cooling works by heating the air to convert liquid water into vapor.
Latent heat is the heat that evaporates water into water vapor. This heat cannot be detected by a thermometer. It is, for example, the heat of the hot pavement that evaporates water after a summer storm. The liquid water transforms into vapor when it absorbs heat from the surrounding environment. The molecular structure in the vapors contains the energy it absorbs.
This natural phenomenon of latent warmth is what makes evaporative cooling possible. The temperature and sensible heat (that can be felt or sensed) of the airdrop as a result. The humidity and latent heat are increased by the moisture vapor that is introduced to the air. Evaporative cooler cool air through the evaporation water. Evaporative cooling is a different type of air conditioning system than traditional ones that use chemical vapor compression refrigeration cycles.
This natural phenomenon is called evaporative cool and evaporative chills. However, many terms are used interchangeably with the same meaning, including adiabatic cooling and swamp coolers.
The principle of adiabatic cooling or water evaporation is used to cool the air down to a comfortable level.
It is a cooling and ventilation method that uses water as its refrigerant.
The evaporative cool process converts water from a liquid to gas by vaporizing it in an air stream. This transformation requires energy that is extracted from air as heat. This causes the air to cool down.
You can apply this evaporative cooling process in many different ways.
- Direct Aerobic Cooling
- Indirect/directadiabatic cooling
- Indirect adiabatic chilling
Evaporative Cooling: How Does It Work
A motor-driven fan blows hot air through cooling pads to create an evaporative system. The water pump delivers water to the cooling pad and keeps them moistened. The cool-down air is then blown inside the building. The wet bulb can be reduced to 60 to 90 percent by cooling the outgoing air. This depends on the effectiveness and efficiency of the evaporative materials. The outgoing air is cooled down to 10 to 15% at room temperature but retains a lot of humidity. For cooling living spaces and work, direct evaporative cooling should not be used.
Two-stage Evaporative Cooling has a higher efficiency than the wet bulbs, with temperatures up to 7°C lower and 60% less humidity than direct or indirect evaporative cooling.
Why Evaporative Cooling Is Important?
The indirect/direct method of evaporative cooling is highly efficient and sustainably powered. It provides a pleasant and productive environment for office buildings, distribution centers, and production facilities. Indirect/direct cooling systems use 10% less energy than mechanical cooling and deliver more or lesser equal temperatures to evaporative cooling. Evaporative cooling doesn’t recirculate warm, polluted air. Instead, it circulates 100% fresh, filtered, and cooled air into space or building. Indoor air quality improves significantly as a consequence.