Machine Condenses Drinking Water Out of Thin Air 438
longacre writes "A new $1,200 machine that uses the same amount of power as three light bulbs promises to condense drinkable water out of the air. On display at Wired Magazine's annual tech showcase, the WaterMill 'looks like a giant golf ball that has been chopped in half: it is about 3ft in diameter, made of white plastic, and is attached to the wall. It works by drawing air through filters to remove dust and particles, then cooling it to just below the temperature at which dew forms. The condensed water is passed through a self-sterilising chamber that uses microbe-busting UV light to eradicate any possibility of Legionnaires' disease or other infections. Finally, it is filtered and passed through a pipe to the owner's fridge or kitchen tap.'"
Amazing! They've invented... (Score:5, Funny)
...the dehumidifier!
Re: (Score:2)
Exactly my first thought on reading this, too.
I bought one last week for $135. (Score:3, Funny)
Re:I bought one last week for $135. (Score:5, Insightful)
I don't know if there are any good kits for steam distillation at home, can anyone point me to one?
Home Distallation Kits (Score:5, Informative)
Steam Distiller for Countertop [promolife.com] $180. 565 watts. 1 gallon every 4 hours. You say you want 20 gallons a day? That will cost you $5000 and draw down 3000 watts 24/7/365. Polar Bear Home Water Distiller [betterthannature.com] For the geek, the micro-brewery might be the better - or at least, more rewarding - investment.
Re:Amazing! They've invented... (Score:5, Funny)
No, it's called a Vaporator, and it was invented by George Lucas in the 70's: http://upload.wikimedia.org/wikipedia/en/8/83/Luke-Treadwell_close_large.jpg [wikimedia.org]
Re:Amazing! They've invented... (Score:5, Funny)
Now all we need is a droid that understands the binary language of moisture vaporators.
Re: (Score:3, Funny)
Re:Amazing! They've invented... (Score:4, Funny)
You mean George Lucas stole it from the designs of the Fremen windtraps in Dune, just like he stole everything else in Star Wars.
Re:Amazing! They've invented... (Score:5, Funny)
Yes, but to compensate he added muppets.
Re:Amazing! They've invented... (Score:5, Informative)
Sir, I do think you just uncovered the long lost answer to:
2. ?
3. Profit!
Hell, it seems to have worked for Lucas.
Re: (Score:3, Funny)
Re: (Score:3, Informative)
He did [wikipedia.org]. From a Kurosawa film from the '50's. Including the behavior (although not the appearance) of R2D2 and C3P0.
Re:Amazing! They've invented... (Score:4, Informative)
Re:Amazing! They've invented... (Score:5, Funny)
...the dehumidifier!
Don't be a smartass. It's a dehumdifier with a filter. Big difference.
Re:Amazing! They've invented... (Score:5, Informative)
Don't forget the sanitizing UV light...
I remember instructions on how to make something like this in the scouts - it involved a sheet of plastic and some rocks.
Re:Amazing! They've invented... (Score:4, Informative)
Yeah, but that only works at night
Re:Amazing! They've invented... (Score:5, Funny)
Re: (Score:3, Funny)
Re:Amazing! They've invented... (Score:4, Insightful)
Given that it's supposed to connect to your fridge or tap, I think their target market has access to water.
Re:Amazing! They've invented... (Score:4, Interesting)
Don't forget the sanitizing UV light...
You know, I've never been terribly confident in those since an 8th grade science experiment. I think the point was to try and come up with something that might cause a mutation in some bacteria - so we grew some in a petri dish, picked one colony (to get all the same type of bacteria), then grew it in a petri dish, then picked some out of that uniform batch and put them in another petri dish. We covered half with aluminum foil, then put it in the UV hood designed for disinfecting lab goggles. The bacteria had no problems growing after being supposedly "killed" by the UV (not to mention, no mutations like we wanted).
Of course, that was still an interesting result that our science teacher liked - so we spread more bacteria on a petri dish, put it uncovered into the UV hood (in case the plastic on the petri dish was opaque to UV or something like that), and ran it for much longer than normal. The bacteria still had no problems growing.
Now maybe it's just difficult to kill bacteria when you've put them on top of a nice big pile of food (aka agar)... But I really don't expect UV to kill anything. That doesn't mean I wouldn't drink the water - it just means that the UV shouldn't be the only line of defense if I think there's really a risk of getting sick (which there probably isn't a big one anyway...).
Re:Amazing! They've invented... (Score:5, Informative)
I think the point is not to sterilize the water, but make it safe to drink. Our bodies are fairly tolerant to bacteria getting inside. Think of it this way: Do you really think that tap water is 100% germ free? Is the glass you're putting your lips on sterile?
The idea of the UV light is to get the parts/qty down to such a level as to be safe for your body to take care of the rest.
Re: (Score:3, Informative)
Most water regulations in the US require 4 nines deactivation of specific indicator viruses and 3 nines removal of specific indicator bacteria.
Re:Amazing! They've invented... (Score:5, Informative)
I'm assuming you got some nice fuzzy mounds in pretty colors, all very opaque. Exposing those mounds to UV light mutates the surface bacteria so badly that they can't reproduce, but you've still got millions upon millions living beneath that one layer in ignorant bliss because their brethren above them absorbed all the UV radiation, sparing them.
The reason UV exposure works better in water is because water is clear and any bacteria that is present is not masked by... well... anything. It even works in fairly turbid water, assuming the water is agitated while being exposed to the UV so all areas get equally exposed.
Sorry to poke holes in your 8th grade fun... but that's what you were observing, not the failure of UV light to kill things.
Re: (Score:3, Informative)
Re:Amazing! They've invented... (Score:5, Funny)
Damn, that was you? I remember reading that article in 8th Grade Science Weekly. Mindblowing dude, mindblowing. If I recall correctly, it was right next to an article about a new field of geological theory based on the observation of baking soda volcanoes. That reminds me, better go renew my subscription!
Re:Amazing! They've invented... (Score:4, Interesting)
Or perhaps your machine wasn't puting out the UV light like it should have, Hell, someone probably looked at the 20 dollar bulbs and said this $1.57 one looks like the same thing.
We did similar experiements in 8th grade, we subjected a lot of things to uv light and it always killed them. I even know of sewage treatment systems that use UV light in the last stage and have never found anything growing in the samples. I'm pretty sure it had something to do with your UV source.
Re: (Score:3, Informative)
If UV sterilized everything, you'd think the Great Outdoors would be microbe-free, and that's hardly the case (nor would we like living here much if it were! :)
I'm reminded of an experiment we did in some advanced college microbiology course. First we grew bacteria from random realworld samples, then assaulted it with various antibiotics to kill it off. Well, that much worked, but all sorts of other interesting slime then grew on the agar instead. :)
Re:Amazing! They've invented... (Score:5, Funny)
WHO?
Re: (Score:3, Informative)
Re: (Score:2)
Hm ... funny or insightful, insightful or funny ...
Oh fuck I just commented, nevermind.
Re:Amazing! They've invented... (Score:5, Insightful)
My dehumidifier in my basement also uses "the electricity of about three light bulbs". The article claimed "$0.3 per litre". Lets run the numbers.
"Three light bulbs" is journalistic code for 300 watts. My electricity costs about 8 cents per kWh. $0.3 per liter implies it uses 3.75 kWh per liter. At 300 watts, it takes 12.5 hours to generate a liter of water. Or rephrased, it could fill a 2 liter soda bottle in about a day.
However, my $200 Chinese dehumidifier purchased at home depot, using the same electricity, easily fills its multigallon bucket in a day, at least during summer months. To help any NASA scientists here, multiple gallons is quite a bit more than two liters.
So, why does this greenwashing gadget cost five times as much as my dehumidifier but only produces about half the output? Surely it can't be continuously dumping 150 watts of UV sterilization light. Maybe those are metric kilowatt-hours as opposed to imperial kilowatt-hours.
The last line is also funny "reduces it from mid-afternoon when a blazing sun dries the air." The only way to dry air is rain, snow, mixing with drier air, dew, and frost. I am a firm believer in the conservation of mass, In a closed system if you evaporate a gallon at midnight I think it will still be there at noon. So, where, pray tell, does the water in the air go when the sun strikes it? Into a cave like a vampire? Outer space? Surely the "blazing sun" isn't visible from underneath a thunderstorm. I think in their inept little journalist way they are trying to say the device becomes vastly less efficient as the relative humidity falls. That would be no big deal, except that where ever there is high humidity, there is probably open water, and its usually cheaper to filter and desalinate open water than to dehumidify it. There is a certain perfection in a device that only works where you don't need it and can't work where you would otherwise need it the most.
Re: (Score:3, Interesting)
The output might depend on the climate it's in, would your dehumidifier grab as much water in the desert?
The "dry air" simply has a lower water saturation, hot air can hold more water than cold air.
Re: (Score:3, Interesting)
"Three light bulbs" is journalistic code for 300 watts.
In practice it could mean anything between
My electricity costs about 8 cents per kWh. $0.3 per liter implies it uses 3.75 kWh per liter. At 300 watts, it takes 12.5 hours to generate a liter of water. Or rephrased, it could fill a 2 liter soda bottle in about a day.
Thus you'd need several of these mach
Re:Amazing! They've invented... (Score:5, Funny)
Or where our water supply is hijacked by a multinational illuminati-esque superpower spending multiple billions of dollars drilling and building super secret underground dams restricting the flow of ground water in a coordinated attempt with the CIA and other world powers to make millions by raising the price of water, which still rains in large quantities.
Also, did you know water vapor is the biggest contributor to the greenhouse effect? This should help stop that.
Re: (Score:3, Insightful)
The latent heat that must be removed when water vapor condenses to liquid is 540 calories per gram.
At a room/air temperature of 20 degrees C, 12 liters of water is 11,978 grams.
So, to condense that 12 liters of water would take 6,468,336 calories, or 27,063,518 joules,
which is equivalent to 7.52 kilowatt hours.
Now, a well made, typical Peltier
Re:Amazing! They've invented... (Score:4, Insightful)
"Three light bulbs" is journalistic code for 300 watts.
I was going to be snarky but I got to the party late. Screw it, I'll get snarky anyway (not to you; your comment makes it a bit more on-topic). I have CFLs, so this thing uses 75 watts? Or maybe the morons are talking about 600 watt street lamps, so it's 1800 watts?
This is slashdot. We know what a watt is. Saying "the power of three lightbulbs" at a nerd site is not only fucktardedly stupid, but insulting as well.
Someone mod the submitter down, "-1 not a nerd and stupid besides."
Because bottled water probably sucks (Score:4, Insightful)
Really, most bottled water is just tap water, a plastic bottle, and marketing. I put my tap water through a tabletop filter pitcher before drinking it. Yeah, I'm a little bit paranoid about what might be in tap water.
And I can't stand that these news articles use a comparison such as "three light bulbs" (which in the middle of the growing popularity of CF bulbs is more vague than ever - 7W? 11? 13? 25? 50? 60? 75? 100??? What's an order of magnitude between friends, anyway?) instead of just stating the number of watts of electric power the thing consumes.
On journalistic units (Score:3, Funny)
It's a simple measure - enough to clearly illuminate a volkswagen but not enough to light up a football feild and only a fraction of what you would need for the library of congress.
Re: (Score:3, Funny)
Really, most bottled water is just tap water, a plastic bottle, and marketing. I put my tap water through a tabletop filter pitcher before drinking it. Yeah, I'm a little bit paranoid about what might be in tap water.
Flouride is in your tap water, poisoning your vital essences.
Re: (Score:3, Funny)
Yeah, why can't they use regular units we all understand? What does it draw in kiloergs per fortnight?
Dasani's UK failure wasn't due to being tap water (Score:3, Informative)
Coke's UK launch of Dasani failed primarily due to an almost immediate full recall [bbc.co.uk] after the initial batches were found to be contaminated with bromate. That basically killed the brand from the start, making what people thought of tap vs. spring water a moot point.
(And the bromate contamination was, oddly enough, not actually present in the tap water they source Dasani from, but was introduced in the "purification" process.)
MOD UP (Score:4, Informative)
http://www.elementfour.com/products/the-watermill [elementfour.com]
"The WaterMill is designed to minimize energy use. It's so efficient that producing one liter of water costs only three to four cents. Alternative bottled water systems typically cost ten cents per liter or more."
Seems kind of silly (Score:5, Funny)
They would get much better results using one of these things in thick, humid air rather than insisting on using thin air.
Re: (Score:3, Informative)
You see, at a given temperature and pressure, there are a given number of gas molecules per unit volume. That's counting nitrogen, oxygen, water vapor, everything.
Nk = PV/T
But never mind theory. The fact is, humid air is substantially less dense than dry air in real life. (There's a lot of truth in what actually happens.) The measurement confirms the theory nicely. For further proof, planes need more runway (higher sp
Who spends $1200 for a pimped dehumidifier... (Score:5, Funny)
Re:Who spends $1200 for a pimped dehumidifier... (Score:5, Interesting)
"public water authority"?
Ah... you must live in a large built-up area where water comes out of a big pipe provided by a municipality of some sort.
I'm on a dug well with extremely hard water and a tendency to go dry during droughts. Between the filters, UV treatment, water softener, RO filter system, pumps, cisterns, etc... there's probably $5000 for all the bits and parts of my water system. I've spent $1200 on far dumber things than drinking water. For someone with, say, a sulphur problem... $1200 would be darn cheap.
c.
Re: (Score:3, Informative)
The whole Yavapai County area.
I lived in Sedona and spent time in Cottonwood. Both of these places as well as the Prescott Valley area has varying degree of arsenic in the ground water.
Of course, the wells are very deep typically 200 feet or more. Back in the Midwest one can dig a hole in the ground with a shovel and have it fill up with water.
Typical well water in Cottonwood Arizona area contains approximately 50 ppb
The University of Arizona
Cooperative Extension
Recommends:
Test your well water regul
Re:Who spends $1200 for a pimped dehumidifier... (Score:5, Insightful)
> I imagine the target market is people who live off the grid...
Such people usually use a clever invention called a well.
> ...a backup in case the grid fails.
It comes with a hand crank?
Re:Who spends $1200 for a pimped dehumidifier... (Score:5, Interesting)
And in many places, digging a well in prohibited. At least Colorado and other parts of the US West. Water rights are a major problem here; Colorado state law doesn't even allow you to collect water which runs off your roof: http://www.hcn.org/issues/40.18/a-good-idea-2013-if-you-can-get-away-with-it [hcn.org]
Re: (Score:3, Interesting)
I think what's going on here is a play on the fear of local tap water, where no amount of filtering can substitute for completel
Dune (Score:5, Interesting)
I'm surprised no one has mentioned Dune or its wind traps yet.
Or that no one has mentioned another story on slashdot [slashdot.org] about extracting water from wind, even if the other one used a windmill to do so.
Re:Or Star Wars (Score:5, Funny)
I don't know - coming to slashdot and getting you're/your wrong... *sigh*
Uncle Owen? (Score:2)
Didn't he make a living with these machines back in the 70's? Something about moisture vaporators...
Re:Uncle Owen? (Score:4, Funny)
Efficiency (Score:3)
I'm somewhat sure that a communal water treatment plant achieves a better efficiency than 600 watt-hours per litre.
Efficiency really sucks... (Score:5, Informative)
IOW, your comment is an understatement.
Just Vaporware (Score:5, Funny)
Re:Just Vaporware (Score:4, Informative)
Re:Just Vaporware (Score:5, Funny)
Solid liquid, eh? Exactly what phases of matter do you have over there?
Re: (Score:3, Insightful)
or is it? [ucr.edu]
Re: (Score:3, Funny)
So it might make Duke Nukem real?
It might, although doing so would likely tear a hole in the space time continuum. Even if you accept the many-universes interpretation of quantum mechanics, a universe in which DNF exists as a playable game is just too improbable.
dehumidifier? (Score:2)
Uhh... am I missing something, or is it just a dehumidifer with a UV light (and maybe some antimicrobial plastic)? Here's a hint: if you are so desperate for water as to need this, there's probably very little moisture in the air anyway.
The target market for this is the ecologically-posturing super-yuppie who doesn't like bottled water but wouldn't be caught dead using (horrors!) water from the plebeian tap.
Re: (Score:3, Informative)
Send this to the third world (Score:3, Interesting)
If we can solve the problem of giving it power (possibly with a hand crank and battery or some such thing), this should be sent to countries where drought is a problem.
Re:Send this to the third world (Score:5, Insightful)
At 600 watt-hours per liter, you're going to be losing more energy to sweat and breathing than you could possibly get close to generating by hand.
Re:Send this to the third world (Score:5, Insightful)
Yeah, this is ONLY 200 times less efficient than desalinization.
Criminy.
Re:Send this to the third world (Score:4, Interesting)
They are standard equipment on any "large" (50+ feet or so) Ocean going boat. They're pretty common even on 30-40 foot boats where the owners are planning extended off-shore voyaging.
Even more: http://www.katadyn.com/ [katadyn.com] manufactures hand powered reverse osmosis devices for lifeboat style use.
So yeah, Reverse Osmosis isn't limited to major industrial installations in any way.
Re: (Score:3, Insightful)
Exactly.
Dehumidification = 600 Wh/liter
Desalinization = 3 Wh/liter
Pumping = 2 Wh/liter (cost to much of So.CA from Colorodo River)
So add in the pumping costs (assuming a LONG pumping distance) and it is still more than 2 orders of magnitude more expensive.
Only on Arrakis would this make sense.
Re:Send this to the third world (Score:5, Insightful)
this should be sent to countries where drought is a problem.
If drought is a problem I suspect there isn't going to be a whole lot of humid air to extract water from. "The mill ceases to be effective below about 30 per cent relative humidity levels,"
And after cranking that thing to produce 300W (about three light bulbs, and I'm guessing it means old-style, power inefficient, ones), you're going to need more than a glass of water.
And that's before we even consider the price tag.
Re:Send this to the third world (Score:5, Funny)
> And after cranking that thing to produce 300W (about three light bulbs, and I'm guessing
> it means old-style, power inefficient, ones), you're going to need more than a glass of
> water.
But you may sweat enough to drive the humidity up to 30% so that the thing will begin to work.
Comment removed (Score:5, Interesting)
Re:The balance may remain.. (Score:4, Funny)
getting your water through the air, or wireless (sic) if you will
How about "tubeless"?
Re: (Score:2)
you just described the water cycle.
We pull it from somewhere. might as well be the air.
Not quite the water cycle (Score:5, Interesting)
You're correct, that's exactly how the water cycle works. But this gadget skips a couple of steps.
The water that's in the bottle on my desk started out as atmospheric moisture over Northern California. Then it precipitated out as snow or rain, ending up as ground water or in a reservoir. From there it was pumped into the local water system, and where I siphoned it into my bottle. Eventually I'll drink it, piss it into a toilet, whence it will find its way through the sewage system and out to sea. Then it will evaporate into the air and the whole cycle will start over again.
Right now, only a small part of the the rain and snow that falls on Northern California ends up in the various water systems we humans depend on. The rest is used by what's left of the natural ecology. One reason this ecology keeps shrinking is that humans keep sequestering more and more water for their own use. With gadgets like this one, we could potentially sequester every single drop before it has a chance to fall out of the sky.
That notion might seem far-fetched. And indeed, we'll probably never go that far in a relatively moist region like the one I live in. But consider an arid region like Arizona. There's relatively little atmospheric moisture there, but what there is sustains a thriving desert ecology. It also is home to human communities that are always struggling to find water [westernfarmpress.com]. It's not hard to imagine Arizonans building enough of this gadgets to grab virtually all the precipitation before it has a chance to fall. When that happens, the desert ecologies are, so to speak, toast.
Which is not to say that this technology is totally evil. I can think of many situations where it would be the most ecologically sound way to obtain water. You just have to remember that this is not an ecological free lunch.
Hmm. (Score:5, Funny)
Re: (Score:3, Funny)
Just install emacs, it has syntax highlighting for over six million dialects of lisp.
Minerals? (Score:2, Insightful)
Regular tap water has a small amount of minerals, whereas distilled water (which this is, I presume) has none. Those minerals are actually rather critical:
http://en.wikipedia.org/wiki/Water_intoxication [wikipedia.org]
(Of course, regular tap water is dangerous too in laaarge doses.)
I have no idea if this is an issue... Anyone have a clue? :)
Also, three lightbulbs? Watts please... Found no proper specs on the site.
Re: (Score:3)
Might want to check your post, it's a bit disjointed.
The minerals in tap water are indeed useful, if not critical. Most distilled water intended for drinking has 'minerals and salts added for taste'. ;)
As your post notes, water intoxication is indeed a valid issue - on average it takes out a couple of military people in basic training a year.
Re: (Score:3, Funny)
In very large doses, everything eventually collapses and forms a black hole, and black holes, as we all know, are dangerous. Therefore, everything is dangerous in large doses.
Re: (Score:3, Insightful)
Re: (Score:3, Informative)
Here in Iowa we get our water from limestone-based aquafers and sand wells. Water's almost crunchy. I just got done using an entire gallon of vinegar to remove the lime from my bathtub, and I have to soak the tap filters several times a year or the screens solidify.
Though once you get used to drinking "real water", bottled water is almost nasty tasting. It's hard to describe... it's just like drinking water from a tap at someone's house that has a water conditioner. It almost has a soapy or dulling/flat
This could be very useful on ships... (Score:3, Insightful)
Nowadays, you either bring all your water along in tanks or use vaps to get fresh water from seawater.
If this works reliably and with that small amount of power, I can see ships and submarines adopting this to save weight and power requirements.
Why? (Score:3, Insightful)
The Element Four site doesn't say, but the inane "3 lightbulbs" remark from the Guardian article suggests it uses 200-300 W to produce 12 liters of water per day, if the humidity is >30%. Assuming 200 W, that's 1750 kWh/year.
The site markets this to First World households. But is that where its value lies? I get potable water from the tap, and so does most of Europe (and I pay E 1/m^3 instead of $0,30/litre). IDK about the States. The site mentions a ludicrous amount of bottled water, is that because US tap water isn't potable or is it just a fad?
The locations that most need this (hot and dry climates) I guess would fail the "humidity >30%" criterium.
The site only compares its efficiency with that of "bottled water" production, but what we need would be a comparison with e.g. a desalinisation plant.
Sorry for rambling a bit, but it adds up to this: is this condensor something the world needs, or just another "a fool and his money are soon parted" scheme?
This is great! (Score:5, Funny)
Both of them.
Snake Oil (Score:5, Insightful)
It really pisses me off that even supposedly "quality" newspapers like the Guardian just reprint some PR's press releases with marginal editing rather than doing even the most basic of reasarch or even, god forbid, any thinking.
TFA answers none of the pertinent questions about this device. But reading between the lines and doing a little thinking it's pretty easy to determine this device is going to be useless as anything but a gimmik.
Firstly, how much power does it use? "Three lightbulbs" says TFA, now as far as I'm aware the lightbulb is not a standard measurement for power consumption. But let's be generous and assume they're taling about standard 60-80W bulbs, that about 200W, give or take.
How much water does it produce? The article doesn't say, their website claims "up to" 12L per day, which I'd imagine is operating under optimium conditions (i.e hot air at close to 100% humidity). That's actually not a lot of water, and i'd imagine operating in any real conditions you could halve or quater that amount.
So adding up the numbers, that's 4.8kWh of electicty to produce about 6L of water. Or 800kwh/m^3. This is a ridiculously, hideously energy intensive way to make water, even desalination, which is seen as ecologically unfreindly, uses about 3kwh/m^3, or is about 250 times more efficient.
TFA also states this device is useless below 30% humidity, which removes the last reason one might consider using it, providing water where no other method is possible.
My point in all this is that doing about 2 minutes thinking, and exactly one google search, I have been able to determine that this thing is anything but ecologically friendly, and anything but economic. The journo writing this article for the Guardian, which for those of you who don't know it prides itself on being a "green" newspaper, couldn't even be bothered to do that and reprinted some PR's words wholesale, giving people the impression that what is in fact a toy for rich consumers who want to feel good about being "green" is some kind of ecological miracle device.
It should be a source of lasting shame to any newspaper to allow their editorial content to be used by some idiot for marketing purposes, sadly it's all too common and nobody even seems to notice the extent to which PR is taking over journalism.
Re:Snake Oil (Score:5, Insightful)
Another way to say it: the amount of energy required to produce 6L of water is about equal to half a liter of diesel. Burning half a liter of diesel would produce about 7L of water.
This device is even more ridiculous than propelling a sailing ship with a fan powered by a windmill...
Incomplete information (Score:5, Insightful)
OK, it uses the same amount of power as three light bulbs when it's operating, but how long does it take to generate a liter of water? Without this, the "three light bulbs" is meaningless.
Legionnaires' disease? (Score:5, Informative)
Legionnaires' disease is only if you INHALE the bacteria. The germ is ubiquitous in water, and drinking it is harmless.
Wiki Legionella [wikipedia.org]
Re: (Score:2)
Re:Pretty sure this isn't new (Score:4, Informative)
not sure what the diff between this and that is, but this one says it's not useful below 30% rel humidity. Not useful in the desert. Not during the daytime anyway. Maybe at night. There's a lot of critters in the desert that get all of their moisture by licking up the morning dew.
Re:Pretty sure this isn't new (Score:5, Informative)
Actually, it can get quite humid in the desret. I work with folks who have spent a lot of time in Saudi Arabia and in such places and they report that it is very humid in the summer time. The reason it doesn't rain is that there is no cold dry air masses that come down to mix with the hot humid ones.
There are some places this might be a very nice appliance.
Kevin
Re: (Score:3, Informative)
At 300 watts you'd need a fair amount of solar panels. And even then you'd only be able to run it during the day -- if you wanted to run it 24/7 you'd need something more like 1+ kW and a battery system. And you'd still be hoping for enough rain to drink rainwater any day it wasn't sunny.
Re:Useful on boats? (Score:4, Informative)
I know that getting drinking water is often an issue for smaller boats which may not have room or power for desalination or reverse osmosis units.
From a systems analysis standpoint, the dehumidifier machine doesn't work. It would be far more efficient to install an electric fan on the stern of the boat pointed at the sails, so as to go faster, thus requiring less stored drinking water. Err, maybe that wouldn't work, how about installing a big windmill in front of the sail and hooking that up to an electric trolling motor.
Seriously though, a Katdyn 35 hand operated R.O. desalinator pump produces about as much water in 30 minutes of hand pumping as this "dehumidifier" produces in a day of using 300 watts.
http://products.katadyn.com/brands-and-products/produkte/Survivor_34/Katadyn_Survivor_35_48.html [katadyn.com]
Or if you prefer to save your hand and arm strength for other purposes (?) and use electricity to desalinate, a katadyn model 40E/12V draws only 4 amps at 12 volts and squirts out 1.5 gallons per hour. It only weighs 25 lbs and is about 7 by 17 by 15 inches. It's amazing that the off the shelf katdyn produces about 30 times as much water per day yet uses about a tenth the electricity of this "greenwash" dehumidifier product.
http://products.katadyn.com/brands-and-products/produkte/Survivor_34/Katadyn_Survivor_35_48.html [katadyn.com]
I have no connection to katadyn other than happily owning a couple of their backpacking R.O. filters.
Re:Hmmmm. The arid west (Score:5, Funny)
Fixed that for you.
Re: (Score:3, Insightful)
Here's a hint. MOVE to Where The WATER IS LOCATED.
Just complete the circuit . . . (Score:3, Funny)
. . . the machine produces water, and water can be used to produce hydroelectric power . . . which can be used to produce even more water . . . and then again more electricity!
Can this be scaled to power an electric car? The static electricity would be the turbocharger.
Re: (Score:3, Interesting)
Cap. Kirk, is that you? (Score:3, Funny)
Kirk .... Are ... you ... back ? ... or ... ar ... you... his .... evil ... twin?
Re: (Score:3, Informative)
I don't think this is much of an issue to worry about because:
1) This tech is only really useful in areas where there isn't already abundant fresh water. For example, I live in Ohio, USA. We have lots of rivers (including the Ohio River, which is a large tributary river of the Mississippi R.), streams, lakes (including a northern coast on Lake Erie, one of the "Great Lakes", which contains a pretty massive amount of fresh water), and lots of ground water as well. Because of the energy requirements to operat