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34 replies
  1. Avatar
    rmendes2 says:

    there is no way the wind is going to force air through that pipe or any other part of that system.. maybe if you had a larger diameter pipe like 4 inches all the way to the cooling box and your air collecting funnel was like 3-4 feet in diameter gradually tapering to the 4 inch pipe the wind would also be needed to keep the funnel pointing into the wind. you would have water collecting inside the pipe from the warmer air having moisture in it. so it would need a drain hole some where. the water filled container as an evaporator would not work., the sun would heat the water. you would have to use some kind of wet media like shredded cardboard. something that would absorb water and be touching the copper pipe, then as the sun evaporated the water out of the media it would extract heat from the copper pipe. there would have to be an exit pipe in the box so air could move. a heat tower would work to create a convection inside the box which could pull the air through the system.

  2. Avatar
    john Doe says:

    Here's a good project: You remem how when (in FL) you go outside in summer for just 5 min and come back in with a wet shirt in summer, we always thought that was sweat (well it is partly) but I'm thinking that the dew point on the very very thinnest upper surface of the shirt falls low enough to condense water (realize we get 95 F and 99% Humidity many times); i measured temp on damp napkin with infrared therm once and the temp on surface (in the shade) fell to 70F well below the dewpoint (remem at 100% humidity the temp IS the dewpoint); am i right ? I'd really like to know for sure, if most of the wetness is condensation or is it all sweat? if its dew, then I think a way can be devised to keep the dew from forming ? On their cooling system, neat if it works, like to see a video. I think the evap box would have to be in the shade otherwise it would be like a greenhouse picking up sun heat to create more heat than the evap cooling would provide (ie why doesn't ocean in summer sun go down to 40F ? there's plenty of wind out on the ocean ); the geo thermal would work to get it down to something like 56-59F if enough coils were deep enough (one guy in nebraska grows oranges in winter using an olympic size swimming pool of air ducts to feed a greenhouse in winters; he uses cheap fans one at entrance of ductwork at one end of greenhouse and one at outlet at other end of Greenhouse; so it keeps the whole greenhouse above freezing, then in daytime the sun contributes to raise it up to perhaps 65-70F , NEAT !

  3. Avatar
    Dalton says:

    Would is not be cheaper so either use the solar panel to power a chest freezer with ice as a thermal "battery"? Or use a "cooling tower" type device that uses the solar fan to drive air up a tube that water is misted down to get the cold? Since we've established that the solar fan somehow does not count as "electricity" despite being an electric fan driven by a source of power that in this case is a solar panel I guess we could just build a bigger panel and directly run a fridge off of it and use the economies of scale already formed by consumer society.


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