This is a very intriguing device that uses a low current at low voltage to transfer moisture from inside an enclosure to the outside. Effectively a solid state dehumidifier with no moving parts.
The version I put in the box is a PD2 and is rated to remove up to 84mg of water a day, so really intended for small enclosures.
The large square unit can handle up to 2.9g of water a day.
Note that these units are intended for use with sealed electrical enclosures and not for house dehumidification.
When I mentioned a ceramic capacitor in the power supply I actually meant the ceramic HRC style fuse which is a good design choice.
The test results in the small test enclosure were:-
9.30pm 67% peaking at about 200mA then settling at 86mA.
10.00pm 58% 25mA
10.30pm 49% 24mA
11.00pm 44% 23mA
12.20am 41% 21mA
1am 37% 21mA
3am 33% 20mA
Running the unit for about 12 hours the following day bottomed out at 22% at 17mA.
The modules I showed here were generously contributed by Westside International when I enquired about getting a sample to make a video about:-
http://westside-int.com/rosahl/
And are made by Rosahl:-
https://www.micro-dehumidifier.com/
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
The version I put in the box is a PD2 and is rated to remove up to 84mg of water a day, so really intended for small enclosures.
The large square unit can handle up to 2.9g of water a day.
Note that these units are intended for use with sealed electrical enclosures and not for house dehumidification.
When I mentioned a ceramic capacitor in the power supply I actually meant the ceramic HRC style fuse which is a good design choice.
The test results in the small test enclosure were:-
9.30pm 67% peaking at about 200mA then settling at 86mA.
10.00pm 58% 25mA
10.30pm 49% 24mA
11.00pm 44% 23mA
12.20am 41% 21mA
1am 37% 21mA
3am 33% 20mA
Running the unit for about 12 hours the following day bottomed out at 22% at 17mA.
The modules I showed here were generously contributed by Westside International when I enquired about getting a sample to make a video about:-
http://westside-int.com/rosahl/
And are made by Rosahl:-
https://www.micro-dehumidifier.com/
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
This can be intresting to dry 3d printer Filament.
Does it collect liquid water on the output side? Could I put this in a sealed container with the input on the outside and draw water out of the atmosphere?
Really cool. If this were being used to protect sensitive electronics I think you'd also want to put a sacrificial piece of metal in there which would oxidize and thereby absorb the excess oxygen to protect the valuable equipment. Of course, it may be a lot cheaper just to apply some moisture-repellant coating like you do with nail varnish.
The company for that I work also uses those deumidifiers and I didnt know that company that produces those. I got the idea maybe you can build a dehumidifier for your 3d printing filament. The biggest problem those modules have is that you have to limit the inrush current to a certain limit. If you dont do that those modules can die very fast.
It is kind of interesting how much it behaves like an led. It is also pretty interesting how it pulls the hydrogen atoms off the water, which is then transported to the other side where it combines with an O2 molecule to form another H2O. It reminds me of the electron transport chain (present in several cellular metabolic processes).
If this is only passing the hydrogen out, then why would it draw moisture in if installed backwards? Have you ever done a test with multiple sealed chambers with humidity sensors in each? If not, that would make a good video I think. 3 or 4 of those project boxes sealed side to side and sealed well with silicone, with the dehumidifiers venting from one box into the next, and the last one venting into the atmosphere. Do multiple tests where one or more are powered up, and compare the humidity in each box. See if having only the 1st one on raises the humidity in the second box, keeps it he same, or even lowers it in both connected boxes. Then turn all of them on and see if there's any significant changes in result. Does it take longer to get the humidity down? Shorter? I'm sure you can think of some other ideas to make such a video, if you haven't already. I sure haven't seen it yet if you have, but I haven't seen ALL of your videos (yet) since this one came out 4 years ago.
It's a proton pump! Living things invented these devices, billions of years ago. The hydroxyl ions will follow due to osmotic pressure.
We have used peltier module types in some of our enclosures .With a drain tube and fan 24v system .The cold side of the peltier plate collects the moisture and drips it outside via drain tube .We use it in wash down rated food production equipment .
This is actually an electrolyzer.
For a moment I was expecting it to be a peltier dehumidifier
There is misconception that reduction in rh is dehumidification . Every 1 deg c temperature rise will drop rh by 5 to 6% but amount of moisture remain same. In current video there is rise in temperature from 19.7 deg c to 20.4 deg c and hence rh dropped from 67% to 60% . I do not think that any substantial moisture has reduced.
What do these cost?
3v is quite close to the energy levels I remember being discussed of hydrogen way back in mumblephysics. Don't have 3v available and the electrons can't do their thing and the ions can't do their migration – can't do the jump, or have too much energy and do the wrong jump?
Also batteries. 3v is close to a typical cell voltage of many chemistries. And they work through migration. If you get the wrong voltage out of them, that's because your chemistry is depleted (or if you put the wrong voltage in them, then they glow menacingly)