alt Hacker NewsNot an engine, but some friends of mine got a mylar sheet that's black on one side and reflective on the other. We tried it out in the desert tied onto trees/vehicles. You put the shiny side down, so the hot IR radiation of the earth is reflected away, and the black side sees the extremely cold (in IR) desert sky. If you put a little hole in the middle and put a bucket under it, you get a fair bit of water, because the mylar sheet gets about 20 degrees C below ambient and a lot of water condenses on it. (even in the desert)
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Wow, that's awesome, and a much bigger temperature difference than I would have guessed. Did you get frost?
Fascinating 20 degrees C is huge. What's a fair bit of water? At what time of day and how long did you collect water?
Now you just need a couple of droids and you could go into the moisture farming business