What is Evaporative Cooling? It is vital to understand the properties and functions of heat, water, and air. Direct type is the most commonly used evaporative coolers. Here, hot outside air is cooled within a machine, forced inside the building, and then exhausted back outside. Other types include the Air Washer and the indirect type.
What Is Heating?
Before we can discuss cooling, we must first understand heat. It exists in two forms, sensible heat and latent.
The heat required for water vaporization is known as Latent Heat. For example, heat from the pavement is used to evaporate water after a summer thunderstorm, while heat from a stove burner heats water to boil. When liquid water evaporates it absorbs heat. Although the temperature of the liquid does not change, the molecular structures of the vapor show how much heat or energy the vapor absorbs.
What Is The Origin Of Latent Heat?
It comes from the environment and the materials it surrounds. The substance absorbs heat when it changes from liquid to solid or liquid to gas. This is a sign that surrounding air, solid objects, or liquids become cooler when they release heat to melt or evaporate.
Total Heat is simply the sum of sensible heat and latent heat. It is the sum of the heat that can be felt and the heat that cannot be felt in a room. Total heat is measured as kilojoules (kJ). 1 kJ corresponds to about 1 BTU. One liter of water evaporates approximately 2,000 Kilojoules of heat energy. This process occurs without external energy.
The Evaporative Air Cooling Technique
Direct Evaporative Air Cooling machines enable heat exchange through a water pump that cools the pads and a fan is driven by a motor that blows outside air through the media panels. These components are combined to speed up natural heat transfer.
A portion of the air’s sensible heat is converted to latent warmth by the Evaporative Heat Cooler.
As we have already explained, the conversion of sensible heat into latent warmth causes hot air in to cool. This happens because some of its sensible heating has been used. This causes the air to cool. The cold air then is pumped into the building. It is never distributed.
Air coolers that rely upon evaporation may slightly increase the relative humidity within a building. However, it is important that you note that the temperature has dropped. Human comfort is created by the combination of temperature, humidity, and evaporative cooling systems are widely used worldwide because they can provide pleasant conditions. Comfortable temperatures are 16degC (61degF), which is 80% humidity. Evaporative air cools increase comfort by increasing air velocity, even in hot environments. Additionally, they reduce the humidity by generating sufficient movement.
As you can see, the relationship between temperature (and relative humidity) is inverse. Higher temperatures result in lower relative humidity. Low relative humidity makes it easier for evaporation, which is why Evaporative cooling technologies work well when temperatures are high.
Thus, even in extremely humid climates, the combination between temperature and humidity will still allow effective cooling.