The Romans water treatment. They knew the pleasures of sitting in a cool well, but it was the ancient Egyptians who started refining the first air conditioning system.
The Egyptians were in the Nile River in the River of Life in many ways. Not only is it provides water for drinking and bathing, but it has allowed farming, the otherwise arid landscape. In addition to the Nile provided water for the first evaporative cooling on a large scale.
The Ages, people knew that putting water tank semi-porous, unglazed clay pot than one, resulting in a cold drink because of evaporative cooling. The Egyptians kicked it up a notch when they built walls and sheets of water cascading over that. Slaves with huge fans stood close by and kept the air circulating through the moving water. The result of the evaporation cooling.
Several ancient cultures also used "wet carpet." We know that the Egyptians, Romans and Greeks used both wet carpet in the air inside homes and other buildings cool. When a thick, damp cloth hung over the doors and / or windows, the air movement effectively promote evaporative cooling and reduce the indoor temperature is even lower, about 66 ° Fahrenheit. The Egyptians have figured out how to make the ice!
In the first days of conditioning, especially in the US, evaporative cooling is still widespread use in dry areas. The cube, adobe-style houses, the Southwest is often the roof structure is designed to support the weight of a large shallow lake. The roof is flooded, the fan blows the dry air in the liquid which accelerates evaporation. The cooled air then passes through the building, a welcome relief in the hot summer months. These coolers, sometimes called "swamp coolers" economical operation and are still in use in some areas.
Modern air conditioning systems no longer rely on water evaporation cooling. Gases, such as Freon refrigerants modern Puro or that reduce the air temperature. The actual air conditioner is usually placed outside the building because it is a harmless and effective way to get rid of internal heat (the atmosphere).
An important function in today's AC system to reduce the humidity inside the structure. Keeping the humidity low (30% of the area) and reduces mold problems, and help alleviate the serious health problems for people who suffer from allergies. Furthermore, heavy dust mite survival low humidity.
When conditioning unit is up and running, it works to maintain a pressure level of the whole structure. In order to work effectively the unit, doors and windows must be closed so that pressure can remain as constant as possible. Spot cooling, pick up a small fan to move the air where you need to get out of your comfort level.