Google open sources solar atmospheric water generator
Check out Thunderf00t's videos cricising solar water collectors, e.g.:<p>- <a href="https://www.youtube.com/watch?v=vc7WqVMCABg" rel="nofollow">https://www.youtube.com/watch?v=vc7WqVMCABg</a> -  Zero Mass Water: BUSTED! "Honestly, it drives me crazy how many people have reinvented the dehumidifier, put a solar panel on it, and the media has danced around like theyve just saved the world!"<p>- <a href="https://www.youtube.com/watch?v=aPvXnmBIO7o" rel="nofollow">https://www.youtube.com/watch?v=aPvXnmBIO7o</a> - Self-filling water bottle: BUSTED! "<i>The fact that its thermodynamically impossible seem to stop 'science communicators' from promoting this.  The fact that its a really dumb, and not particularly inventive idea didnt stop the 'science communicators' from promoting this.  Kinda depressing really.</i>"<p>Problems include:<p>- it's much cheaper to bring in a tanker of water from somewhere else, than for the electricity to do this.<p>- It's a dehumidifier; in places where the air is wet, it rains, and you don't need it. In places where you need it, you need it <i>because</i> there's not much water, so it doesn't work well.<p>- It's going to be prone to growing bacteria; warm and moist.<p>- It needs a vast volume of air; when water becomes steam it expands 1000x. Which means to go the other way you need at least 1000 litres of steam dragged through for a litre of water. Air can be around 4% water says Britannica.com, so 20,000 litres of humid air for a litre of water if it's perfectly efficient. Thunderf00t's estimate is 50,000 litres of air for 1 litre of water; And the air needs to be cooled.  That needs big fans and lots of power (air is heavy to move).