Evaporative Cooling

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Evaporative Cooling:
An evaporative cooler is a device that cools air through the evaporation of water. 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. Evaporative cooling requires a water source, and must continually consume water to operate.
Other definitions:Wikipedia Reegle


Evaporative Cooling

Evaporative Cooling Tower

Diagram of Evaporative Cooling Tower

Evaporative cooling technologies take advantage of both air and water to extract heat from a power plant. By utilizing both water and air one can reduce the amount of water required for a power plant as well as reduce the footprint required for an air cooling system. Evaporative cooling towers are commonly used in any thermal generation technologies (i.e. coal, natural gas, geothermal, CSP, etc). Evaporative cooling towers flow air over the cooling water to induce evaporation of the cooling water and simultaneously condense the steam exiting the turbine back into a liquid state. Evaporative cooling towers are able to circulate most of the cooling water that is available, greatly reducing the plant's water consumption. Since the water is evaporating off make up water is required, but typically in the magnitude of 2-5% of the total flow.