【太阳能“水收割机”:缺水或成过去式】

【太阳能“水收割机”:缺水或成过去式】据报道,加州大学伯克利分校发明了一种“水收割机”,能够在低湿度和低成本的情况下每天(晚上)从沙漠空气中提取饮用水,其金属有机骨架(MOF)捕获水分子,随温度升高排出水分子,并且收集的水可立即清洁并饮用。据介绍,其本质上是一个“简单的盒子”,除了阳光之外不需要任何能量,在非常低的湿度下也能正常工作,将有望造福缺水地区生活的人民。

The solar-powered humidity harvester that can suck drinkable water out of THIN AIR

  • A water harvester from UC Berkeley is capable of extracting drinkable water from desert air each day/night cycle at low humidity and at low cost
  • The technology could be useful for people living in water-starved areas
  • A metal-organic framework (MOF) traps water molecules, expels them as temperatures rise, and the water collected is clean and drinkable immediately
  • Water scarcity may soon be a thing of the past.

    A water harvester developed by researchers from UC Berkeley is capable of extracting drinkable water from desert air each day/night cycle at a low cost, even at very low humidity.

    It's essentially a 'simple box' that requires no energy other than sunlight.

    Scroll down for video 

    A water harvester from UC Berkeley is capable of extracting drinkable water from desert air each day/night cycle at low humidity and at low cost

    A water harvester from UC Berkeley is capable of extracting drinkable water from desert air each day/night cycle at low humidity and at low cost

    'There is nothing like this,' said Omar Yaghi, who invented the technology underlying the harvester.

    'It operates at ambient temperature with ambient sunlight, and with no additional energy input you can collect water in the desert.

    'This laboratory-to-desert journey allowed us to really turn water harvesting from an interesting phenomenon into a science.'

    It uses an organic compound called metal-organic framework (MOF) that contains an extremely absorptive porous material.

    he technology traps water molecules even in low humidity. It then moves them into a receptacle, where it is immediately clean and drinkable.

    'The key development here is that it operates at low humidity, because that is what it is in arid regions of the world,' Yaghi said.

    In these conditions, the harvester collects water even at sub-zero dew points.

    The UC Berkeley team sets up the water harvester for field tests in Arizona in October 2017. It uses an organic compound called metal-organic framework (MOF) that contains an extremely absorptive porous material

    The UC Berkeley team sets up the water harvester for field tests in Arizona in October 2017. It uses an organic compound called metal-organic framework (MOF) that contains an extremely absorptive porous material

    Optical microscope image of crystals of the newest aluminum-based metal-organic framework, MOF-303, which captures twice as much water as the aluminum-based MOF used in desert tests

    Optical microscope image of crystals of the newest aluminum-based metal-organic framework, MOF-303, which captures twice as much water as the aluminum-based MOF used in desert tests

    The current MOF (MOF-801), made from the expensive metal zirconium.

    With this, they estimate they can ultimately harvest about 200 milliliters (about 7 ounces) of water per kilogram (2.2 pounds) of MOF, or 3 ounces of water per pound.

    However, Yaghi has created a new MOF made mostly from aluminum, which is 150 times cheaper and has captured twice as much water in tests.

    'There has been tremendous interest in commercializing this, and there are several startups already engaged in developing a commercial water-harvesting device,' Yaghi said.

    'The aluminum MOF is making this practical for water production, because it is cheap.'

    The harvester is basically two boxes, one inside the other.

    The inner box has MOF spread on top, acting like a sponge. The outer box collects the water expelled as temperatures rise.

    As ambient air diffuses through the porous MOF, water molecules preferentially attach to the interior surfaces. X-ray diffraction studies have shown that the water vapor molecules often gather in groups of eight to form cubes.

    Sunlight entering through a window heats up the MOF and drives the bound water toward the condenser, which is at the temperature of the outside air.

    The vapor condenses as liquid water and drips into a collector.

    “The key development here is that it operates at low humidity, because that is what it is in arid regions of the world,” Yaghi said.

    The next field test will be carried out later this summer in Death Valley, where temperatures can reach up to 110 degrees.

    http://www.dailymail.co.uk/sciencetech/article-5840997/The-solar-powered-humidity-harvester-suck-drinkable-water-AIR.html


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