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Topic Summary

Posted by: AGelbert
« on: March 26, 2018, 02:42:00 pm »

This new device can draw water from desert air
At humidities as low as 10% 

By Rob Thubron on Mar 23, 2018

Researchers have developed a device that can draw water from even the driest desert air. Scientists from MIT and UC Berkeley have field-tested the invention, which improves on a concept design from last year, in Tempe, Arizona, proving the potential of the method.

When it was first proposed in a Science article last year, the paper drew a lot of attention—not all of it good. "It got a lot of hype, and some criticism," said Professor Evelyn Wang, who worked on both studies. “All of the questions that were raised from last time were explicitly demonstrated in this paper. We've validated those points.”

Most methods of drawing water from air require humidities of over 50 percent and lots of energy to work, but the improved design can extract potable water at humidities as low as 10 percent and is solar-powered. 🌞

“This has no moving parts. It can be operated in a completely passive manner in places with low humidity but large amounts of sunlight ,” said researcher Sameer Rao.

The device is based on a type of high-surface-area, super-porous material called metal-organic framework (MOF). The MOF in this device can extract water from the air during the night and store it in its pores. The water is released during the day using sunlight.


By testing the device on the rooftop of an Arizona State University building, the team "was field-testing in a place that's representative of these arid areas, and showed that we can actually harvest the water, even in subzero dewpoints."

Researchers say that the device’s output is estimated to be more than a quarter-liter of water per day per kilogram of MOF, and no impurities were found during testing. If scaled up and made more efficient, that yield could be tripled. "We hope to have a system that's able to produce liters of water," said Wang.

https://www.techspot.com/news/73850-new-device-can-draw-water-desert-air.html
Posted by: AGelbert
« on: May 11, 2014, 10:54:31 pm »

Greentechnology Spotlight: Collect Water From the Air

SustainableBusiness.com News

 We have all heard about how difficult it is for people to access clean water in many developing countries, with people walking miles every day to collect some.


All sorts of low-tech technologies have been developed, from people riding bicycles to pump water to Bill Gates's famous toilet that converts wastewater to drinking water. Most of them don't work in the end because either they are too complicated, or require people to find a water source.


 The Smithsonian published an article on an inspiring invention that just might work - it literally draws water from the air.


Developed by industrial designers Arturo Vittori and Andreas Vogler, Warka Water can collect over 25 gallons of clean drinking water each day. It looks like a 30-foot-tall vase and every detail has a function.




Warka Water Vase

Smithsonian explains it this way:

 "The rigid outer housing of each tower is comprised of lightweight and elastic juncus stalks, woven in a pattern that offers stability in the face of strong wind gusts while still allowing air to flow through. A mesh net made of nylon or  polypropylene, which calls to mind a large Chinese lantern, hangs inside, collecting droplets of dew that form along the surface. As cold air condenses, the droplets roll down into a container at the bottom of the tower. The water in the container then passes through a tube that functions as a faucet, carrying the water to those waiting on the ground."


Gathering Juncus stalks


Juncus textiles



Even in the desert, the tower works because condensation occurs based on the difference in temperature between nightfall and daybreak, where they can vary as much as 50 degrees F, Vittori says.   

It's easy to clean and can be erected in about a week without special tools. And at $500, it's less than a quarter of the price for a Gates toilet.


 Vittori is looking for an investor to mass produce Warka Water towers.

http://www.sustainablebusiness.com/index.cfm/go/news.display/id/25700

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