Device pulls water from dry air, powered only by the sun

Posted by $ nickursis 4 years ago to Technology
46 comments | Share | Flag

Now this is very interesting and Gault like. About time genius appears...
SOURCE URL: https://phys.org/news/2017-04-device-air-powered-sun.html


Add Comment

FORMATTING HELP

All Comments Hide marked as read Mark all as read

  • Posted by NealS 4 years ago
    Fantastic, but at this stage in my life I'm really more impressed with this little device. If you're into fishing, you might want to take a look, especially if you can't see very good, have shaky hands, or any of the other issues that come along with age. I bought 30 of them (wholesale @ Qty of 10) for all my friends that fish.
    https://tyepro.com/
    Reply | Mark as read | Best of... | Permalink  
    • Posted by $ 4 years ago
      Cool, just illustrates where there is a need, and a producer, something happens...if only more of the world worked that way..Nice little item, I don't fish, but I can see the use of it, I have trouble with little screws and things in electronics...
      Reply | Mark as read | Parent | Best of... | Permalink  
  • Posted by Eyecu2 4 years ago
    I saw something on this about a year ago. The one I saw was a personal portable device, essentially a self filling canteen. At that time it was being bandied about as a year or 2 off from production. This makes me think that the one I saw was wishful thinking. God knows I would LOVE to have something like that.
    Reply | Mark as read | Best of... | Permalink  
    • Posted by jsw225 4 years ago
      Reply | Mark as read | Parent | Best of... | Permalink  
      • Posted by $ 4 years ago
        So, the bottle thing is based on a construct with a limited power supply available, and promises made of performance.

        These guys are making a claim of a physical performance of a specific material, adn said they had confirmed the performance in testing, they also say:

        This proof of concept harvester leaves much room for improvement, Yaghi said. The current MOF can absorb only 20 percent of its weight in water, but other MOF materials could possibly absorb 40 percent or more. The material can also be tweaked to be more effective at higher or lower humidity levels."

        The water is being released by the materiel, then condensed, the condensation being done at ambient, which would certainly limit performance.

        Just remember, in the 20 years before the Wright Brothers, numerous "scientists" and "experts" debunked and pilloried the idea of flight. It took a fundamental breakthrough in the application of power to weight (their little engine) plus an efficient wing design, to get the Wright Flyer off the ground.

        The fundamental science is the hard part, the rest is just engineering.
        Reply | Mark as read | Parent | Best of... | Permalink  
      • Posted by Riftsrunner 4 years ago
        I saw this topic and brought it to Phil's attention. He tweeted he will be debunking this as well. It does claim to be different from a Pelletier collector, but is still violates thermodynamics to work as they claim.
        Reply | Mark as read | Parent | Best of... | Permalink  
  • Posted by Rudde 4 years ago
    This is just a boring old dehumidifier, not powered by the sun, not very efficient at extracting any mentionable quantities of water from the air.

    So the device will not work on dry air as the title state, their example is from 20-30% air humidity. They claim 2.8l in 12 hrs, assuming 30% humidity and I will assume 30°C since nothing else is stated and lower is worse. They would need to extract 100% of the water from 311 cubic meters of air assuming 100% efficiency, and this in 12 hrs. I know for a fact this is not possible by the device in the picture, and they do not say how much energy it used doing this. If we had just too much energy we could simply convert salt water to fresh water way more efficiently then this device would be able to extract fresh water from air, we don't do that today because it's inefficient.
    Reply | Mark as read | Best of... | Permalink  
  • Posted by starbird56 4 years ago
    But -- but -- no environmental impact study has been performed! It will add to global warming by changing the climate! What about the effect on local wildlife? It will require a state and a federal tax to maintain this elitist water grab that in no way benefits those too poor to buy one for themselves! ad nauseam
    Reply | Mark as read | Best of... | Permalink  
  • Posted by $ Dobrien 4 years ago
    Tremendous potential. Could change what is land habitable or not.
    Reply | Mark as read | Best of... | Permalink  
    • Posted by jsw225 4 years ago
      Not likely. For a device like this to be useful, you need sunlight, humidity, and warm air. Otherwise the process would be so inefficient, you'd probably gain about 1/10th the claimed results. The places that are inhabitable are usually missing 1 or more of these things.

      For example, you could put something like this in the desert where there is little water. There is so little humidity, that you'd better spend the energy created bringing in water from somewhere else. Or, like Sam Kinison said: https://www.youtube.com/watch?v=P0q4o... .
      Reply | Mark as read | Parent | Best of... | Permalink  
      • Posted by $ Dobrien 4 years ago
        "Not likely" Please explain your reasoning.
        A water harvester that uses only ambient sunlight to pull liters of water out of the air each day in conditions as low as 20 percent humidity, a level common in arid areas.
        The prototype, under conditions of 20-30 percent humidity, was able to pull 2.8 liters (3 quarts) of water from the air over a 12-hour period, using one kilogram (2.2 pounds) of MOF.
        Reply | Mark as read | Parent | Best of... | Permalink  
        • Posted by jsw225 4 years ago
          See here for information on the engineering behind what's happening: https://www.youtube.com/watch?v=aPvXn...

          Total amount of water in the air is based on Temperature. 20% relative humidity at freezing temperatures contains 1/8th the amount of water 20% relative humidity does at 100 degrees (F). For 2.8 liters of water at room temperature, the system would need to filter 50X shipping containers of air at normal efficiencies to achieve this. And to power this in the time claimed, you'd basically need 15 square meters of solar panels to do it. And that's assuming everything is perfect (perfect sunlight, perfect weather...).

          There's no such thing as a free lunch...
          Reply | Mark as read | Parent | Best of... | Permalink  
          • Posted by $ Dobrien 4 years ago
            I thank you for your response. The article implies a
            Successful testing.
            Reply | Mark as read | Parent | Best of... | Permalink  
            • Posted by jsw225 4 years ago
              Oh, I have no doubt that they successfully tested it. But they left out several important things like Weather, Temperature, and Power Expended to hit 2.8 liters...
              Reply | Mark as read | Parent | Best of... | Permalink  
              • Posted by $ 4 years ago
                Ah, but just as Intel starts with 1 good transistor in a new process, then experiments, tweaks and adds new minor discoveries to get a functional die, then you tweak and experiment more to get 10's of good die, then you do more and get 80% of the die on a wafer. It is an iterative process, the killer is that first transistor. They will tweak it, and have verified the basic concept works, the rest is just engineering.
                Reply | Mark as read | Parent | Best of... | Permalink  
    • Posted by $ 4 years ago
      Oh, Dob, huge implications, and huge money on the table.
      Reply | Mark as read | Parent | Best of... | Permalink  
      • Posted by $ Dobrien 4 years ago
        Hi Nickursis,
        Thanks for the post. With regard to the table of cash, One can only imagine how the heads are spinning trying to figure an effective tax and the global warming effect we will be causing by lowering the humidity . Sarcastically , with out humor but as a prophesy. Alas the last thing the environazi's want is for a lot of people to have fresh water.
        ”Isn’t the only hope for the planet that the industrialized civilizations collapse? Isn’t it our responsibility to bring that about?”
        Maurice Strong,
        Founder of the UN Environment
        Reply | Mark as read | Parent | Best of... | Permalink  
        • Posted by $ 4 years ago
          All true, but competing liberal interests, like saving poor people in foreign countries, clean water for Mexico and everywhere else, no power used, less global warming gases, etc. So they will have to fight among themselves, while someone gets rich...
          Reply | Mark as read | Parent | Best of... | Permalink  

FORMATTING HELP

  • Comment hidden. Undo