Not a plant to be seen, the desert ground is too dry. But the air contains water, and research scientists have found a way of obtaining drinking water from air humidity. The system is based completely on renewable energy and is therefore autonomous.
Cracks permeate the dried-out desert ground, the landscape bears testimony to the lack of water. But even here, where there are no lakes, rivers or groundwater, considerable quantities of water are stored in the air. In the Negev desert in Israel, for example, annual average relative air humidity is 64 percent – in every cubic meter of air there are 11.5 milliliters of water.
Research scientists at the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB in Stuttgart working in conjunction with their colleagues from the company Logos Innovationen have found a way of converting this air humidity autonomously and decentrally into drinkable water.
“The process we have developed is based exclusively on renewable energy sources such as thermal solar collectors and photovoltaic cells, which makes this method completely energy-autonomous. It will therefore function in regions where there is no electrical infrastructure,” says Siegfried Egner, head of department at the IGB.
The principle of the process is as follows: hygroscopic brine – saline solution which absorbs moisture – runs down a tower-shaped unit and absorbs water from the air. It is then sucked into a tank a few meters off the ground in which a vacuum prevails. Energy from solar collectors heats up the brine, which is diluted by the water it has absorbed.
Because of the vacuum, the boiling point of the liquid is lower than it would be under normal atmospheric pressure. This effect is known from the mountains: as the atmospheric pressure there is lower than in the valley, water boils at temperatures distinctly below 100 degrees Celsius. The evaporated, non-saline water is condensed and runs down through a completely filled tube in a controlled manner. The gravity of this water column continuously produces the vacuum and so a vacuum pump is not needed.
The reconcentrated brine runs down the tower surface again to absorb moisture from the air.
“The concept is suitable for various sizes of installation. Single-person units and plants supplying water to entire hotels are conceivable,” says Egner. Prototypes have been built for both system components – air moisture absorption and vacuum evaporation – and the research scientists have already tested their interplay on a laboratory scale. In a further step the researchers intend to develop a demonstration facility. …
If we are going to extract water from the air, we need to do it sustainably and this seems like one of the best ways. Here’s another:
Airdrop is a low-cost, self-powered solution to growing crops in arid regions.
Inspired by Australia’s worst drought in a century, Mr Linacre – a former student at Swinburne University of Technology in Melbourne – turned to nature to find ways of capturing moisture from air.
He studied the Namib beetle, an ingenious species that lives in one of the driest places on earth.
With half an inch of rain per year, the beetle can only survive by consuming the dew it collects on the hydrophilic skin of its back in the early mornings.
Airdrop uses the same concept, working on the principle that even the driest air contains water molecules that can be extracted by lowering the air’s temperature to the point of condensation.
It pumps air through a network of underground pipes, to cool it to the point at which the water condenses, delivering water directly to the roots of plants.
James Dyson said: ‘Biomimicry is a powerful weapon in an engineer’s armoury. Airdrop shows how simple, natural principles like the condensation of water, can be applied to good effect through skilled design and robust engineering.
Cool. I wonder if I could combine the two ideas. I like the AirDrop device because it is small. That little bulb is an air turbine powered by a solar panel on top. Air enters the underground housing where water condenses out on copper wool-filled copper tubing. Where can I buy one?