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An idea that’s been floating in my head for years, and it has just demanded to get out, but I don’t have the funds to prototype.
This could be as cheap as some 2″ x 12″ structure holding a 48′ piece of sheet-metal duct, painted flat black. My hunch is that it will start a significant draft as soon as the sun hits it, no matter the season. It’d die off pretty fast when the sun was down, though.
Could also be done with some form of masonry, and although the startup from sunup would be far slower, the thermal mass would cause it to draft for a good while after sundown.
I’m thinking the 48″ (122cm) duct because that is a pretty common and relatively inexpensive Industry Standard size, and by my analysis, more cost-effective (and powerful) than the 36″ Standard. It does vary a lot by manufacturer, for the same wind speeds, too, yes?
I personally would mount the turbine at the bottom for ease of maintenance and less load on the supporting structure, and, if there’s sufficient draft, multiples might even be stack-able?
There’s also the obverse variant, where, in a terribly arid climate, one could mount a mist sprinkler on top, and evaporatively cool the air (edit: causing a downdraft), which, now that I think of it, would be a nice switch-over after dark during Arizona Summers™, where it stays OMG hot for a good bit. I think I remember an issue of Popular Science, where they featured an inflatable, bouyant, large-scale one, over a **significant** area, that also acted as a Swamp Cooler *for* said area.
O shit… this is a true late-night old stoner thought… could evaporative cooling help combat global warming? <IF scratchhead = TRUE then (endramble)>
I have not the maths. And at this age and stage am a bit too often medicated enough to focus to learn. Is there some energetic genuis out there willing to help, and let me know if 60′ (18 m) would be enough?
And if anyone gets froggy and wants to steal outright, have at it!!!
And one more edit for an and where an an should have been. Good night, Anne.
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