Air well (condenser)
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An air well or aerial well is a structure or device that collects water by promoting the condensation of moisture from air. Designs for air wells are many and varied, but the simplest designs are completely passive, require no external energy source and have few, if any, moving parts. A related, but quite distinct, technique of obtaining atmospheric moisture is the fog fence. An air well should not be confused with a dew pond. A dew pond is an artificial pond intended for watering livestock. The name dew pond sometimes cloud pond or mist pond derives from the widely held belief that the pond w...
An air well or aerial well is a structure or device that collects water by promoting the condensation of moisture from air. Designs for air wells are many and varied, but the simplest designs are completely passive, require no external energy source and have few, if any, moving parts. A related, but quite distinct, technique of obtaining atmospheric moisture is the fog fence. An air well should not be confused with a dew pond. A dew pond is an artificial pond intended for watering livestock. The name dew pond sometimes cloud pond or mist pond derives from the widely held belief that the pond was filled by moisture from the air. In fact, dew ponds are primarily filled by rainwater. All air well designs utilise a substrate with a temperature sufficiently low so that dew forms. This condensation releases latent heat which must be continuously dissipated. Cooling of the substrate is typically achieved by radiating heat to the sky, during periods of cool breezes particularly at night,or by conduction to some other heat sink. Three principal design are used for air wells: high mass, radiative and active. High-mass air wells were used in the early 20th century, but the approach failed.
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