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Evaporative Cooling

 Evaporative Cooling

As the name implies, evaporating cooling works by evaporating water into an air stream. This system is best illustrated in a personal way with the cool effect you feel when you step out of the swimming pool and get a breeze all over your body! The cold effect is caused by a process of rapid evaporation of water from your body. The same thing happens when you sweat. The “cool air” is simply the air that flows through your body in the form of sweat. It is a natural way to keep us cool in hot weather or for physical exertion.


Steam cooling is the use of this evaporation process to cool air passing through wet cooling sources. Cooling media can be as simple as a damp cloth. In fact, this process has been used for hundreds (if not thousands) of years. Hanging a wet cloth in an open window cools the air passing through the fabric.


In technical terms, temperature is measured in two (2) important ways related to evaporating cooling. These are the "dry lamp" and the "wet lamp" expressed in degrees Fahrenheit or Celsius. There are a few other measurements that indicate the amount of moisture in the air. These are "dewpoint", "a grain of moisture per pound of dry air" and "pounds of moisture per pound of dry air", "absolute moisture" and "related moisture". The following brief description of these measures will help to understand this process.


Dry bulb: ambient temperature (air circulation) taken with a thermometer.


Wet Lamp: The lowest air temperature that can be achieved by evaporating air.


Wet Bulb Stress: Differences between Dry Bulb and Wet Bulb temperatures. I.E. if the Dry Bulb is 100 degrees (f) and the Wet Bulb is 70 degrees (f), the Web Bulb Depression is 30 degrees (f). Disappointment of Water Bulbs depends on the efficiency of the cooling media and the depth of the cooling sources used.


Cooling Performance: Percentage of temperature drop across all media compared to Wet Bulb Depression. I.E. if the Wet Bulb Depression is 30 degrees (f) (as in the example above) and the actual temperature drop is measured in the cooling media by 27 degrees (f), the effective cooling of the media is 90%. (27/30 = .90). The cooling efficiency is also called "Saturation Efficiency" because it means the amount of moisture in the air. Saturation efficiency of 100% will indicate a decrease in temperature by 30 degrees (f) in the above example of the pressure of a wet bulb.


Dewpoint: The temperature at which a humidity starts at a slippery surface indicating a 100% increase in air per humidity. That's the way dew gets on the grass in the morning. The air temperature of the dry bulb drops to the temperature of the wet bulb.


Moisture values ​​in a pound of dry air: A method of measuring actual water vapor (moisture) in a pound of dry air, commonly referred to as a "humidity measure". I.E. 50 degrees of humidity at 100 degrees (f) is equal to 12% of the corresponding humidity and 70 degrees (f) the liquid at sea.


Kilograms of moisture per pound of dry air: It is the same as grains except the weight of water vapor (moisture) expressed in kilograms. In the same example above, the moisture content would be equal to .009 # pound of dry air.


Total humidity: The actual measure of water vapor in the air.


Relative humidity: Percentage of moisture in the air compared to the amount of moisture that the air can absorb. This is the most commonly read reading in weather reports. The report of "100 degrees and 12% relative humidity (RH)" is similar to all the above examples. Using the analogy of a part of a glass filled with water means that the glass is 50% full. It can hold an additional 50% where it can start to fill up if more water is not added.


Evaporation Level: The rate at which water is pumped into the air through cooling sources. For practical purposes, this level is measured in liters of water per hour (or minute).


Cooling Sources: The Evaporative Cooling Pad (ECP), made of cellulose paper is designed for specially designed portable portable devices that can absorb and retain water to provide high cooling efficiency. Cellular media are managed by agents that strengthen and resist decay to enhance its useful life. The geometry of cellular media provides cooling without any water carryover as long as the air velocity through the pipes is below the recommended level.


The most effective media is EcoCool Evaporative Cooling Media. The EcoCool ECP media is treated with anti-rot and retrieving components. The media has a cross made with eyes to increase the mixing of air and water.


Saturation efficiency from 60 to 98% can be achieved depending on the air velocity and depth of the cooling pad.