--- Log opened Tue Aug 17 00:00:40 2021
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18:18 < nmz787> fenn: yeah there's a youtube video talking about a CaCl "waterfall" but I am unsure of whether this would be a literal waterfall (albeit salty), or if it would be a "powder/granule fall"
18:22 < L29Ah> the trick is that it becomes waterfall if it falls long enough
18:30 < fenn> i was going to do a literal waterfall, like one of those laminar flow fountains http://www.youtube.com/watch?v=n4h8JtZGieY
18:30 < fenn> with fluorescent dye and internal LED lighting of course
18:31 < fenn> i am a little concerned about having chloride ions everywhere degrading all my clean steel surfaces
18:31 < fenn> so i was looking into using magnesium sulfate instead, but it's nowhere near as good as CaCl as far as hygroscopicity
18:32 < fenn> calcium nitrate is another option
18:32 < fenn> that has flammability issues
18:33 < nmz787> how about CaSO4
18:33 < nmz787> idk how that compares hygroscopically
18:33 < fenn> not very soluble
18:33 < fenn> salt wiki has some useful tables
18:33 < nmz787> "Anhydrous calcium sulfate is ground to form a colorless, inert pigment which is often used as a paper filler. It is strongly hygroscopic and is also used as a drying agent for solids, organic liquids, and gases."
18:36 < fenn> i suppose you could also mix cations
18:39 < fenn> https://www.saltwiki.net/index.php/Calcium_chloride#Hygroscopicity i think the important thing is that the solution phase is at a low water activity around 30C ("hot")
18:43 < nmz787> I don't think being a solution is necessary though
18:44 < nmz787> as long as water adsorbs
18:44 < fenn> it is if you want a waterfall
18:44 < nmz787> the it can desorb later
18:44 < nmz787> ah, true
18:44 < nmz787> I was also thinking of just a packed tube or something
18:44 < fenn> i guess you could move powder around with augers, but since it's deliquescent it's probably a giant clod of stuff stuck together
18:45 < nmz787> have a drinking bird sort of thing that shaded and unshaded the tube to change ab/desorb phase
18:45 < fenn> right
18:45 < fenn> waxtuators
18:45 < fenn> useless modern internet... can't find anything
18:46 < nmz787> .g waxtuator
18:46 < saxo> https://gnusha.org/logs/2020-09-07.log
18:46 < nmz787> lol
18:46 < fenn> wow an old irc log of me complaining about the same thing
18:46 < nmz787> not even that old really
18:46 < fenn> google really hates showing you old things
18:48 < fenn> the wax melts and expands inside a piston, pushing it out a little bit, and with some leverage this can be used to open greenhouse windows at a certain temperature, or close the lid on your desorption box
18:49 < fenn> we also discussed using a linkage mechanism with some hysteresis; when the mass of the sorbent increases it compresses a spring and this drives the mechanism
18:50 < fenn> then it gets hot and drives all the water off, which reduces the mass, and it resets
18:52 < fenn> .title http://rexresearch.com/ellsworth/ellsworth.htm
18:53 < saxo> Ellsworth, et al. -- Atmospheric Water Generator -- Air Well
18:53 < fenn> https://en.wikipedia.org/wiki/Air_well_(condenser)
18:56 < fenn> i'm mostly interested in the CaCl stuff for use as a solar (thermal) dehumidifier, for approximating something like air conditioning
18:56 < fenn> i bet you can use reverse osmosis to regenerate it
--- Log closed Wed Aug 18 00:00:41 2021