Alien April 19, 2012 12:08 AM If this machine can extract water from the really dry air in deserts, how much more could it produce in a humid climate, where clean drinking water is still needed? Mr Stiffy April 19, 2012 12:12 AM Electric chilling? I would have thought a straight compressor with a variable speed drive and temperature controlled ducting. Tim Parnell April 19, 2012 10:51 AM extra to Alien - Like Haiti for example.... Karsten Evans April 19, 2012 11:51 AM Before compressor refridgeration there was cyclone refridgeration and you can get pnematic powered coolers. They are noisy so never took on.Instead of using electric maybe the wind could be gathered into cyclone units seprating cold air molycules from warmer. Then use the cold air flow to cool metal plate or heat exchange unit which then cools either normal outside air or the warmer air flow so the moisture drops out.Might be noisy but in the desert who cares. Just let the water feed into the ground so it joins the local environment. It's trees and irrigation that is needed to stop deserts expanding.. My vision is a wind gathering trumpet/trombone like mouth mounted on rotating base with a 'Dyson' cyclone unit and a simple heat exchanger...Anyone have any ideas on this? Slowburn April 19, 2012 01:18 PM If the windmill compressed air so that electricity could be produced on demand the expanding gas will provide the cold to produce condensation. ps. Use the waste heat from compression to drive another compressor. John Comeau April 19, 2012 01:28 PM the headline appears to be misleading, the energy "harvested" is used to extract the water; you don't get to use both the energy and the water. good engineering though. StWils April 19, 2012 02:11 PM Airwells were invented in ancient Iraq about 4.5 to 5 thousand years ago. Airwells consist of carefully selected, shaped and placed rocks in a spiral tower. With an optimal airspace and an exact inward tilt such that condensation drips down an interior path to a cistern, or quanat, in the ground at the base of an airwell. Roughly, a 30 ft tall tower, 15-20 ft in diameter can produce 1000 gallons of water per day. Correspondingly, during the Soviet invasion of Afghanistan one of the Soviet's essential objectives was to bomb Airwells and thereby devastate the countryside. Prior to the Soviet invasion Afghanistan had been the world's second largest exporter of dried apricots, behind Turkey. After the invasion, the Afghan people were unable to feed themselves and were driven into urban slums. hooner April 19, 2012 03:59 PM Abu Dhabi has anything but dry desert air. It is very humid much of the time. Kudos for taking advantage of this fact. Now, how to get the population to stop consuming so much water that each person would need their own personal water harvester to offset their consumption. Slowburn April 19, 2012 06:03 PM re; hoonerTrying to solve problems by limiting consumption just perpetuates the problem and empowers the government. Two things I try to avoid. joeblake April 19, 2012 10:04 PM I live in Perth, Western Australia, and during the summer just ending there were daytime temperatures of over 40 degrees Centigrade, for 3-5 days in a row. I purchased a small "wheel around" refrigerated air cooler, which could produce anything up to 10 litres of "waste" water per day. Several years previously I'd bought a small "water from air condenser" (that I first saw in Gizmag) which produced over half the water, but filtered and sterilised, and quite delicious. I have 1600 watts of photovoltaic panels on the roof of my house (on-grid). The air cooler consumed a maximum of 1100 watts of power. The water condenser consumed about 900 watts when condensing, and 40 watts when pumping the condensate through its multiple filters and UV light steriliser, but did nothing to cool the air inside the house, simply reducing the humidity. So this summer I was able to run the cooler (from the photovoltaic panels) and put the condensate through the condenser filtering system. More water. And even when the outside daytime temperature was in the mid-40s, the inside temperature of the house never went above about 27 degrees Centigrade. In effect, the brighter the sun, the cooler the house.There seems to be an invention waiting. A refrigerated air-cooler with built in filtration and sterilisation that runs off the sun. A fairly high tech solution, but it seems to work well.@slowburn, I'm at a loss to understand how "limiting consumption just perpetuates the problem and empowers the government".