Swiss technology can solve GCC water shortage problem

Switzerland - Researchers have developed technology that allows them to harvest water 24 hours around the clock, with no energy input

For arid climates like the Middle East that is still grappling with water scarcity, the solution could be lying on the rooftop of ETH university’s building in Zurich.

The condenser developed using a small device made up of a specially coated glass pane, and a cone-shaped solar radiator could be the first big breakthrough for zero energy water harvesting from the atmosphere.

Iwan Hächler, a young doctoral researcher at the public research university, says the zero-energy condenser is a much more energy-efficient solution for addressing water shortages than the desalination process that is commonly used in the GCC countries for potable water supplies.

“While desalination is an option to produce drinking water out of salty saline water, it requires a lot of energy, and the impact is something to consider if we want to make the shift towards renewable energy,” said Hächler.

While 40 per cent of the world’s population is affected by water scarcity, he says there is enough water in the atmosphere if we have the right harvesting techniques.

Researchers at ETH Zurich have now developed a technology that, for the first time, allows them to harvest water 24 hours around the clock, with no energy input, even under the blazing sun. The new device essentially consists of a specially coated glass pane, which both reflects solar radiation, and also radiates away its own heat through the atmosphere to the outer space. It thus cools itself down to as much as 15 degrees Celsius below the ambient temperature. On the underside of this pane, water vapour from the air condenses into water.

Watergen's largest machines can provide 6,000 litres of water in a day and have already been used to support villages in Africa and hospitals in the Gaza Strip.