In the dry desert, where no shadows of lakes, rivers and groundwater can be seen, where to find drinking water? German researchers have recently invented a new method: asking for water from ubiquitous air.
The Institute of Interface Engineering Processing and Biotechnology of the Fraunhofer Institute in Germany announced on June 2 that the institute and a German company have jointly developed a device that can self-sufficiently convert moisture in the air into drinking water. It can help residents of the desert area solve some water shortage problems, because even in the desert, the air still contains available moisture. In the Israeli Negev desert, the average annual relative humidity of the air is 64%, which is equivalent to 11.5 milliliters of water per cubic meter of air.
The researchers say that this device relies entirely on solar power for heating and can be used in areas without a grid. Its core technology is to use the hygroscopic effect of salt water to absorb moisture in the air. The first step is to let the salt water flow down from the top of a tower and absorb moisture from the air in the process. Then pump the brine into a vacuum container several meters high, and then use solar energy to heat the brine diluted by the absorption of moisture to distill out the salt-free water. The reason why the vacuum container is used is to make the brine boil at a temperature far below 100 degrees Celsius, thereby reducing the energy consumption of the distillation process.
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