Harvesting Water from Air with Less Energy

Harvesting Water from Air with Less Energy



Scientists from the Technion (Israel) recently reported findings in a new study that shows a saving of between 5% and 65% of the traditional electrical energy requirements needed to extract water from air. These numbers are based on modeling results and scientists report that the system will produce high-quality water.

According to an International Organization for Dew Utilization study published in 2000, amounts water vapor comparable to all the underground and surface liquid freshwater on the planet is present in the atmosphere around us.


water from air

An innovative atmospheric moisture harvesting system (Image credits: American Chemical Society)


The new design, pioneered by scientists from the Technion (Israel), uses a liquid desiccant to separate the vapor from air first and then cool only the vapor rather than cooling the air first.

Three interconnected cycles (air, water and desiccant) were studied over a range of ambient conditions using modeling techniques. Different operation conditions resulted in various optimal configurations being identified. The savings reported are ascribed to the vapor separation process.

When integrated into atmospheric moisture harvesting systems, the liquid desiccant separation stage can work under a wide range of environmental conditions. Solar or low-grade heating is used as a supplementary energy source. The researchers believe that the performance of the combined system is far superior to anything being currently used.

The full study was published in the journal Environmental Science & Technology.


July 22, 2016 / by / in , , , ,

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