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HydroCool Advanced Outdoor Systems
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A comprehensive site of the latest product ranges of outdoor cooling, misting and heating solutions for commercial, industrial and hospitali
A comprehensive site of the latest product ranges of outdoor cooling, misting and heating solutions for commercial, industrial and hospitali

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What is Evaporative cooling ?

An evaporative cooler (also swamp cooler, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. Evaporative cooling differs from typical air conditioning systems which use vapor-compression or absorption refrigeration cycles. Evaporative cooling works by employing water’s large enthalpy of vaporization. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration. In extremely dry climates, evaporative cooling of air has the added benefit of conditioning the air with more moisture for the comfort of building occupants.

The cooling potential for evaporative cooling is dependent on the wet bulb depression, the difference between dry-bulb temperature and wet-bulb temperature. In arid climates, evaporative cooling can reduce energy consumption and total equipment for conditioning as an alternative to compressor-based cooling. In climates not considered arid, indirect evaporative cooling can still take advantage of the evaporative cooling process without increasing humidity. Passive evaporative cooling strategies offer the same benefits of mechanical evaporative cooling systems without the complexity of equipment and ductwork.

How does a Misting System work ?

The principle behind misting depends on evaporation. Smaller particles of mist are better because they evaporate quicker. Smaller particles are created by increased water pressure. Therefore, the higher your water pressure is the more effective your system will be.

Some misting systems can operate directly off of your household pressure. These are considered “low pressure” systems. They are the least expensive type of system and their effectiveness is limited. Additionally, because of the lower water pressure, a higher frequency of clogging is probable and therefore more maintenance is required.

If a pump is added to the system, the efficiency of the system can be increased. “Medium pressure” systems are often the choice of homeowners because they are efficient and yet not cost prohibitive. These systems typically operate at 100 to 200 Pounds of water pressure.

To achieve the highest level of performance, a “high pressure” system is required. These systems, often called fog systems because of the cloud like appearance they create, are generally operated at 800 pounds of pressure or more. They are also the most expensive since the materials used endure such high pressure. Although these systems can be installed in private homes, their higher price tag generally limits them to use in commercial applications, such as restaurants, zoos, hotel pool bars and amusement parks.

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