Evaporative Cooling; How it Works

cooling repair in MissouriAmerican Services heating and cooling installation in Edwardsville knows that evaporative cooling uses evaporated water to naturally and efficiently (energy) cool the environment. Modern technology has produced two types of evaporative coolers, direct and indirect. Direct evaporative coolers, better known as swamp coolers, operate by cooling outdoor air by passing it over water saturated padding, causing the water to evaporate into the padding. The 15-40degree Fahrenheit cooler air is then directed into the building and pushes warmer air out through windows. When direct evaporative cooling systems are used in commercial buildings they are most often roof mounted.

When operating a direct evaporative cooler, windows or vents must remain open part way
to allow warm air to escape outside, being replaced by cooled air. Unlike central air conditioning circulating the same air; evaporative coolers provide a steady stream of fresh air into the building.

Indirect evaporative coolers have a heat exchanger that prevents humidity from entering the building. Efficiency tends to be lower than that of the swamp coolers mentioned above.

Another type of evaporative cooling for commercial buildings is night sky radiant cooling. This approach works best in climates with large diurnal temperature swings, such as in the Southwestern United States.

The process begins when water is sprayed on to a low slope roof surface at night then cooled through a combination of evaporation and radiation. The water then drains to a tank in the basement or is circulated through tubing embedded in a concrete floor deck. Cooling is accomplished during daylight hours by either recycling the water that was routed to the basement tank the night before, or circulating cool water thru tubing located in the concrete floor slab.