Atmospheric water generators

<p >An&nbsp;<b>atmospheric water generator</b>&nbsp;(<b>AWG</b>), is a device that extracts water from&nbsp;<a href="http://en.wikipedia.org/wiki/Humidity" title="Humidity" >humid</a>&nbsp;ambient air. Water vapor in the air is&nbsp;<a href="http://en.wikipedia.org/wiki/Condensation" title="Condensation" >condensed</a>&nbsp;by cooling the air below its&nbsp;<a href="http://en.wikipedia.org/wiki/Dew_point" title="Dew point" >dew point</a>, exposing the air to&nbsp;<a href="http://en.wikipedia.org/wiki/Desiccant" title="Desiccant" >desiccants</a>, or pressurizing the air. Unlike a&nbsp;<a href="http://en.wikipedia.org/wiki/Dehumidifier" title="Dehumidifier" >dehumidifier</a>, an AWG is designed to render the water&nbsp;<a href="http://en.wikipedia.org/wiki/Potable_water" title="Potable water" class="mw-redirect" >potable</a>. AWGs are very useful in locations where pure drinking water is difficult or impossible to obtain, as there is almost always a small amount of water in the air. The two primary techniques in use are cooling and desiccants.

The extraction of atmospheric water may not be completely free of cost, because significant input of energy is required to drive some AWG processes, sometimes called "trading oil for water". Certain traditional AWG methods are completely passive, relying on natural temperature changes, and requiring no external energy source. Research has also developed AWG technologies to produce useful yields of water at a reduced (but non-zero) energy cost.</p>