Mini peltier dehumidifier teardown.

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bigclivedotcom

bigclivedotcom

Күн бұрын

These little dehumidifiers are widely available under several brand names and with wildly varying prices for the exact same units.
They are usually described as 300ml or 500ml dehumidifiers although that does not in any way relate to their daily extraction performance. In short these work for very small spaces, but are not as efficient as traditional compressor or desiccant drum dehumidifiers. If you buy one to keep a room dry you may be disappointed, but for a small portacabin or camper they may actually be a viable option.
They're very quiet due to the only moving part being a computer style fan. The two main components, the fan and peltier array both operate directly on 12V so it's actually viable to run one of these from a small solar panel. Note that the operating current is 3A.
The main failure modes of these things are probably the fan bearing going noisy due to it's low cost and the power supply failing due to the relatively heavy load of 3A at 12V and inevitable cost cutting.
The design is very similar to the little mini-fridges you get that can run from a cigarette lighter socket in a car. Theoretically you could use one of these dehumidifiers in a car, but the battery load of 3A is quite high for continuous operation.
The internal construction is ultra simple. A peltier array is sandwiched between two heatsinks. A small smooth one on the cold side that condenses water vapour out of the air that is pulled in across it, and a larger heatsink on the hot side that the air then passes to keep it cool.

Пікірлер: 345
@AlexanderClark-zv9ne
@AlexanderClark-zv9ne Жыл бұрын
My original intention for this humidifier was to use it for plants that require high moisture levels. After using it in my room, kzbin.infoUgkxtD9aJ2m6GU-X1IChQxjn9l31K1A7Kpwj however, I think that's where it is going to stay in the fall and winter season at least. The increased humidity in my room made the room warmer and more comfortable. I had first ran the humidifier for 4 hours with the timer setting for it. After the first hour, I checked my room and can feel the difference. When the full 4 hours was up, I checked again and noticed that the humidifier was shut off as it is suppose to. The moisture level never seem to get passed 56/57%. I then let it run until all the water is used up, which it wasn't all used up. There are still some left in the base that you are not suppose to add water to. I filled up the water tank all the way again, being careful when removing it from the base. Some left over water may spill out. After putting it back on and setting the unit to auto, I let it operate. It didn't stop running, rather I don't know if it did at any point since I didn't check it regularly, for 24 hours after which the water in the tank ran out. The moisture reading never passed 56/57%, which may be a good thing for me. Being situated right next to my bed, the noise was not very noticeable with the occasional water gurgle from time to time as the unit ran.
@thelastfrontier_
@thelastfrontier_ 5 ай бұрын
What the hell are you on about
@surronzak8154
@surronzak8154 5 ай бұрын
This is a dehumidifier ...
@RcLifeOn
@RcLifeOn 8 жыл бұрын
Hi man! So basically if I were to have a fan, heat sink, cooling chip and a second heat sink I could build my own dehumidifier?
@jawr1215
@jawr1215 7 жыл бұрын
RCLifeOn or fridge. This is what those tiny mini fridges use, and why they can often warm cans up as well (by reversing polarity across the PD).
@memphisalvaro8587
@memphisalvaro8587 3 жыл бұрын
Instablaster.
@brothyr
@brothyr 8 жыл бұрын
Congrats. you became an example against Pontus "The self-filling water bottle"
@batlin
@batlin 6 жыл бұрын
sWeasel511 no clue about what?
@batlin
@batlin 6 жыл бұрын
That's a rather ironic comment given that you spelled 2 out of the 4 words incorrectly.
@ArlenMoulton2
@ArlenMoulton2 6 жыл бұрын
lern how too spoke enlish!
@pilotsmoe
@pilotsmoe 7 жыл бұрын
compressor (phase-change) cooling is so more efficient then these peltier fridges and dehumidifiers coming out. I have a compressor mini fridge that draws 45 watts (closer to 500w for a few seconds on startup) and can freeze everything solid, but have a relitive that has a peltier based mini-fridge and is always complaining that the internal temp is around 50 degrees, I put my kill-a-watt on it and it was drawing 200w, not to mention it'll never reach temperature and kick off unlike a compressor version.
@bigclivedotcom
@bigclivedotcom 7 жыл бұрын
The peltier fridges are terrible. very inefficient, but cheap to make and sell to people without actually mentioning that the running costs will be so massive.
@1drumshark
@1drumshark 4 жыл бұрын
They're really meant to be used for small, battery powered chillers. Or in small places like a gun vault or safe. Something to bring camping or on a picnic to keep things cold for a few hours. If you don't need it to be portable, phase change is absolutely the best option.
@RichardDTube
@RichardDTube 24 күн бұрын
Didn't know you could get a 45W compressor cooler. A dehumidifier based on that would be convenient. Typical smallest is 220W.
@bobbivaneman1584
@bobbivaneman1584 5 жыл бұрын
You are hilarious! "It was certainly worth taking to bits" & "It's brand new but that's never stopped me before"! Thank you for the very educational video & the smiles.😁
@bradjohnson5323
@bradjohnson5323 9 жыл бұрын
The module is very cheap, you can get what I think is the exact same unit on ebay for $0.99. This is a 4 amp model, you can get a 15 amp version for $5.00.
@brianmi40
@brianmi40 3 жыл бұрын
Without a mention of the humidity you exposed it to, and the temperature and square footage of the space, and the exact time allotted for the device to run, there is no way to determine whether the small amount of water you found is reasonable for such a small device or not. When attempting to review a product try to think of all the relevant parameters to pass on as without them you could be misleading people with comments like that. Certainly you know they only function well in ideal conditions: above 50% humidity and about 50F is where they can start to work, but the "bell curve" for performance will be around 80F and 80% humidity so it has plenty to draw from the air. All humidifiers (and air conditioners) depend on the purchaser properly selecting the device for the space and environment. A device like this can take the edge off a small room, like a bathroom, but that's about all. For anything demanding a Peltier unit won't cut it and you need a compressor based unit as mentioned.
@grimlycurmudgeon1298
@grimlycurmudgeon1298 8 жыл бұрын
I've been using one for years in a stored car, every winter. It's quite happily extracting a litre every few days and the full turn-off switch works fine. However, don't forget to empty it every so often, as when a big freeze occurs, the ice formed in the catch tank will crack it wide open. Of course, the availability of spares for these is non-existent. As you found, the fan is nothing more than a cheap generic PC component - I replaced the OEM one after a year due to noisy bearings. The replacement, a decent quality Papst, has lasted for years. One thing I found was the unit, more importantly, the power supply brick, wasn't immune to flood damage, and that killed it. It lives on though; now being powered by an ATX PSU, the Peltier modules just chuntering away like they'll never give up. In fact, I was so impressed by how it did its job, when it wasn't being nearly killed by weather and bad luck, I bought another one recently, to go into another car. These things are ok for that size of volume, but for a room, forget it.
@D3cyTH3r
@D3cyTH3r 8 жыл бұрын
My first thoughts were solar-powered water collection as well -did you develop the idea further Clive?
@MyBigThing2010
@MyBigThing2010 7 жыл бұрын
so 30W x 10 hours = half-ish a cup of water? ...seems like a waste of electricity/very inefficient to me...looks designed by an engineering class clown that was lazy...n like it could have been done better VERY easily by sizing the heat sink properly and running the air better..
@JamesSmith-dn8lb
@JamesSmith-dn8lb 5 жыл бұрын
Undervolting the peltiers helps alot with efficiency. The problem is it takes a lot more peltiers to do the same job, which increases manufacturing costs.
@JodBronson
@JodBronson 8 жыл бұрын
THANK YOU for this tear down :D. I wanted to see how they build it, now I know :D
@stulop
@stulop 7 жыл бұрын
I have a slightly larger one of these in a walk in wardrobe with an outside wall. we suffered much condensation mould. since using it we have no mould. they are good for small spaces like wardrobes.
@honzco
@honzco 9 жыл бұрын
i'm researching in regard to extracting water from air using desiccant surface. if a dehumidifier like this modifies in design it can produce considerable amount of water. thank you for your video very useful
@pattytwowheels2273
@pattytwowheels2273 8 жыл бұрын
Hi Clive, thanks for this teardown video. I've always wanted a small dehumidifier for a tiny room and had looked into the peltier-based models, but found $35USD+ way too expensive for what essentially is a peltier and a few heatsinks. Now that I know how these things work, I can use a few peltiers I have and some spare heatsinks to recreate this device for only the cost of my time. Thanks again!
@bigclivedotcom
@bigclivedotcom 8 жыл бұрын
+Patty Two Wheels A recent test showed that the peltier unit was only about 20% as efficient as the desiccant drum unit. So the initial cost of the small unit would soon be outweighed by the running costs.
@josh6715
@josh6715 8 жыл бұрын
+bigclivedotcom and the full switch will never work and less one it changers its mind to how much water it wants to get out of the air
@mspark400smith2
@mspark400smith2 7 жыл бұрын
The point of the vid is this design is bad even when optimized it’s just a very ineffective way if you’re looking to actually draw a decent amount of water per day. This inherent limitation and slope of increasing inefficiency as the area around it comes to temp. His whole point is this would be completely ineffective in any practical sense. So I don’t suggest you waste your parts and time this way, Peltier modules as a whole are just super inefficient even with the high power units it would be terrible at this practically for condensation uses even with high power consumption. The math has been done and even with the most efficient end best units we can make it would still be wildly ineffective. Technically they work but there exist much better ways as even refrigeration with gasses abs compression is more efficient generally. Hence the self filling water bottle thing or the “water seer” devices and anything similar can never work and would barely provide a few sips of water a day. Sorry but they haven’t found a miracle that solves the water crisis so simply and easily. Keep in mind the Waterseer was a straight up scam and basically so is any similar fonts self filling bottle and they absolutely know it never word. And high school student could do the math to show what would be produced with the power used and the modules we can make and quickly find the idea as laughable and only works technically ever so slightly in (theory usually lol) as being a step away from free energy . Physics says so. Maybe try some of the other project uses for your spare unit and make something more useful and effective like a fridge. And you could do solar but the required panel would defeat the purpose and raise size and cost vastly. Wall power is cheap and likely available to you.
@condew6103
@condew6103 6 жыл бұрын
Of course it adds about 30W of heat to the space it's operating in, which lowers the humidity by raising the temperature. When I worked with my dad in a resort, there was a 100W light bulb in the outdoor box that contained the PA system, just to keep it a little warmer inside and prevent condensation that would mess up the electronics. So in a confined space like a linen closet, this peltier unit might be as effective as a 40W bulb.
@KentuckyRanger
@KentuckyRanger 6 жыл бұрын
I had a peltier CPU cooler in my monster rig build, back in 2007. It worked VERY well!
@mattelder1971
@mattelder1971 5 жыл бұрын
I used to use them way back in the late 90s, around the AMD K6 or Pentium III era. They worked very well unless the fan on your heat sink died, then they were capable of some extreme temps on the hot side and would typically burn out.
@markmarkofkane8167
@markmarkofkane8167 3 жыл бұрын
Until a few days ago, I haven't heard of the Peltier effect. I got a mini dehumidifier for my bedroom. It does help. Maybe not as well as a dehumidifier that has a compressor.
@daraparsi
@daraparsi 3 жыл бұрын
If the power supply output allows, you might be able to replace the peltier device with higher wattage one. If you use bigger one you may confront freezing problems instead of condensation, for that reason as you know, you cant go too far on that. You can make your own. Increasing heat sink area may solve freezing problem because it would dissipate the sub freezing cold which I know you know it very well.
@ElJohnerino
@ElJohnerino 8 жыл бұрын
Ahh good work, Clive! I've got one of these in an alcove for some defense while a neighbour's overflow pipe was keeping the outside wall wet. Thanks to your efforts here, I now won't have to risk busting it with my curiosity. Big Clive Public Information Service. My next coffee dedicated to you, sir.
@shaunbrown1402
@shaunbrown1402 7 жыл бұрын
It's never going to be that effective, there's no insulation around the peltier. So some of the heat is going back into the cold side. It needs a frame of foam between the two heatsinks.
@RichardDTube
@RichardDTube 6 жыл бұрын
Yes, I've pushed foam in there.
@MrContatoindireto
@MrContatoindireto 5 жыл бұрын
Also there are screws connecting the two heat sinks. Its not necessary to be a genius to see that it's a big technical mistake.
@nand3kudasai
@nand3kudasai 8 жыл бұрын
lol no isolation between the heatsinks? and joined by a metal screw? and it actually have thermal paste that goes from one side to the other (@9:00). i think, maybe, that's not very optimal.
@SiskinOnUTube
@SiskinOnUTube 9 жыл бұрын
I don't feel so bad about my effort to make one now. I re-purposed a mini fridge to act as a dehumidifier and it was able to extract about a teaspoon an hour. The mains power one I bought takes out way more water.
@Spacemonkeymojo
@Spacemonkeymojo 2 жыл бұрын
Great video. Would using a larger Peltier module or larger cold sink make it more effective?
@bigclivedotcom
@bigclivedotcom 2 жыл бұрын
These things can never be efficient, even in their absolute optimum operating conditions.
@phillipbartlett1819
@phillipbartlett1819 3 жыл бұрын
I don't want to break it but when did that stop me before. Lol. I love the fact you are part curious kid, knowledgeable engineer and intelligent comedian all in one.
@littlemammalsclub5988
@littlemammalsclub5988 7 жыл бұрын
Why the air is not pulled in from the hot side to the cold, so the temperature difference is greater and the effect would be more efficient? It is logical - just there must be additional air holes behind where the fan is and the fan should pull the air in. Then the air will go hot and then go to the cold side and then exit from the front air holes (not the back ones). And why the cold radiator is smaller then the hot one?
@richardmarkham8369
@richardmarkham8369 3 жыл бұрын
I guess it could swap polarity every so often to defrost itself? (If used somewhere like a car where temps might get too cold?)
@johncooper7242
@johncooper7242 Жыл бұрын
love your vodcasts Clive they are always so informative. they tell me everything that I need to know about how a device works and therefore how to check it is functioning correctly and repair it if it is not
@CarterColeisInfamous
@CarterColeisInfamous 8 жыл бұрын
You are correct swapping the polarity changes the direction of the heat pump
@Solocat1
@Solocat1 5 жыл бұрын
Duh...
@ugursenturk5860
@ugursenturk5860 5 жыл бұрын
hey I got one of these and want to use it in my fridge i dont want a dessicant dehumidifier as it adds more heat what can i do to make it stop freezing up. I have a controller i can use to control the on/off and humidity %
@Harani66
@Harani66 5 жыл бұрын
@@ugursenturk5860 this will also generate heat. In order to make a cool side to collect condensation, the peltier must also have a hot side.
@Nexfero
@Nexfero 8 жыл бұрын
I bought like 8 of those peltier chips, a while ago. Finally I now have found a use for them
@Canukistani
@Canukistani 7 жыл бұрын
I have one of these, and i am hoping you might be able to tell me why it stopped working. i turned it off for a few days and now when i turn it on both the power and full lights blink and nothing else happens. the water tray is definitely pushed in. thanks
@gordonlawrence3537
@gordonlawrence3537 8 жыл бұрын
Just did some quick maths on this one. The latent heat of evaporation of water is around the 100,000 joules per kilo mark. I think it's actually about 118,000 but 100,000 makes the maths easy. If your kit cools to the tune of 33W then it will take about hour to condense 1kg of water IF it's running at near 100% efficiency. The problem is that the hot bit and the cold bit are too close together so it is working at I would guess 10% efficiency at most.
@herseem
@herseem 10 жыл бұрын
If you ask me, the cooling heatsink doesn't look as big as it could be, and neither is the airflow optimised properly. It looks like a half-baked design, to be honest. You might dramatically improve the performance (proportionally, that is) by slapping on a much bigger cooling heatsink and improving the flow so that the incoming air has to go through the heatsink from top to bottom (or bottom to top), and making sure the outgoing air doesn't interfere with the incoming air.
@bigclivedotcom
@bigclivedotcom 10 жыл бұрын
The size of the cooling heatsink is probably deliberately small to increase the temperature differential between it and the incoming air. the airflow does run down the channels of the heatsink before passing round the back to the hot side. There's a very good chance this IS the actual optimised design, but it's just very inefficient by its nature.
@cmazy
@cmazy 9 жыл бұрын
bigclivedotcom Does the air flow from cold side to hot side? The other way preheated air should gain higher temperature difference in cold side and better efficiency.
@jayswaff4120
@jayswaff4120 9 жыл бұрын
Cmazy That would make it extract even less water than it does already! The rh would drop due to the pre-heating, and the cooling side would then just take it back to the original rh and temperature, probably getting nowhere near the dew point.
@freddyzdead1
@freddyzdead1 7 жыл бұрын
+bigclivedotcom It doesn't look as though there's adequate air flow through the cold heatsink. It should be pushing as well as pulling. Also, what was the exhaust air temperature? A dehumidifier should be temperature-neutral as far as possible. The peltier seems a bit underpowered as well. The part number 12704 means 127 thermocouple elements and 4 amps design current. But these things are very sensitive to supply voltage. If it's running on 12 volts, it will barely work at all. At 15 volts, there will be a huge difference in efficiency.
@leocurious9919
@leocurious9919 7 жыл бұрын
He said "from cold to hot" and that would increase the performance a lot, thats how all (real) dehumidifyers work. That way a lot less energy is wasted to cool down air when u actually just want to put energy into condensing water, as the cold air cooles the hot side it makes the cold side even colder. So it basically regenerates (some of) the energy put into cooling the air.
@robbinred
@robbinred 3 жыл бұрын
Mine has a flashing green light any ideas had it apart power is reaching fan because it's moving slightly but not going around
@bigclivedotcom
@bigclivedotcom 3 жыл бұрын
It may be a power supply issue or a thermal cutout has tripped.
@kenrawlings4184
@kenrawlings4184 9 жыл бұрын
Good Video. Interesting to see whats in the dehumidifiers. Have one myself, it extracts 250ML s every day!
@pgScorpio
@pgScorpio 6 жыл бұрын
There is one thing they forgot in the design..... I have exactly the same dehumidifier running in my shed, but when the temperature in the shed goes below about 8°C the cold side heatsink becomes one big lump of ice ! So I added a 10° clixon to turn it off.... (also added a drain hose so I don't have to empty it manually 😄)
@SagePatrynXX
@SagePatrynXX 8 жыл бұрын
works very well to me. and just in time banggood has that part who knew was just looking for heatsinks for the heck of it and up pops that thing www.banggood.com/2Pcs-TEC1-12715-Heatsink-Thermoelectric-Cooler-Peltier-Plate-Module-p-945050.html
@JamesRichardWiley
@JamesRichardWiley 4 жыл бұрын
It could work in a small enclosed space to reduce moisture.
@alexanderthomas2660
@alexanderthomas2660 7 жыл бұрын
I also have one of these, it runs on only 9V. It has some additional component near the heat sinks, I guess it must be some kind of thermal switch (that either cuts out when the thing heats up too much or maybe when it would be on the verge of freezing). Because the fan is still rated at 12V, I added a ‘turbo’ switch with a booster circuit that brings it at full speed. Even then, performance is still very poor, although it helps a bit to get the moisture out of a poorly ventilated bathroom. But my big compressor-based dehumidifier pulls about 20 times the amount of moisture out of the air per Watt.
@jawr1215
@jawr1215 7 жыл бұрын
Alexander Thomas I've used a 'proper' dehumidifier to dry our washing indoors, and the amount of water it removed from the environment, even with no washing behind dried is impressive. Easily enough for two people to drink in case of emergencies wth a generator.
@howardadams4072
@howardadams4072 7 жыл бұрын
I have to say I was very impressed with the one I bought to get all the dampness out of my car. 600ml over the Xmas period in temperatures below freezing. For the price it did a fantastic job, how else to you get the inside of your car dry in winter. Clive, thanks for the breakdown.
@bigclivedotcom
@bigclivedotcom 7 жыл бұрын
I take it you must have run an external power supply to it? One of the applications where this thing would really work well is in a remote caravan with its own solar panel so that when there was enough sunshine the unit would trundle up and start extracting moisture from the interior and draining it to outside.
@drex5220
@drex5220 5 жыл бұрын
A bit late But, When you get close to the end of your journey turn off the heating in your car, open a window and let all the heat out of your car so the windows, seats etc, are the same temp as out side so condensation cannot build up with the heat difference, also when it's snowing out side try not to get snow inside your car of your shoes, get some rubber collector mats for your car, the type that have a grid cell pattern on them to collect the water off your shoes then you can just tip the collected water out of the car. always worked for me and still do it to this day.
@treysnyder3536
@treysnyder3536 3 жыл бұрын
I had to replace the fan on one of these and couldn't remember which way the it needs to face, thanks Clive!
@cakbudi9
@cakbudi9 3 жыл бұрын
12704, about 4 amper. That easy to over heat. The reason why cheap dehumidifiers using small amper are to get fast sublimation. But it's forcing the so much.
@ozricm
@ozricm 8 жыл бұрын
Now, would running one of these outside on a humid day collect water? Could these be in some way a way to collect water from the air?
@Mira_linn
@Mira_linn 8 жыл бұрын
+Ozric M. you chould, however it have the same problems as rainwater as its still will be polutet with what ever is in the air that will make contact with water like dust or smog. and i guess its quite an expensiv way of collecting water aswell as will only work if the air is humit allready so you whould have no luck trying to do so at greenland or in the sahara desert unfortunatly.the main reason to use one is to remove damp to provent molt in buildings or slowly try to dry books or something like that :)
@silverballer1911
@silverballer1911 8 жыл бұрын
leave a bucket outside than u has water :D
@jimmybaldino5026
@jimmybaldino5026 4 жыл бұрын
Then you have that useless self-filling water bottle thing. You're much better off collecting rainwater.
@blue1901
@blue1901 Жыл бұрын
why don't they add more peltier and make it work a little bit more. i love Peltier. i hope it will be the future of a/c
@theblukatlife
@theblukatlife Жыл бұрын
Hello, where I live during summer it gets to around 48°c - 52°c and right now we are experiencing very high humidity which is very bad ☹️ you cannot be outside, we are cloudy right now and I noticed the clouds literally disappear (probably because they are literally mixing with the humidity around the air. Right now is 12am and we have a temp of around 35°c and humidity 43%. 35 people have died in this month because of the extreme heat, do you think or could you do a video about these kind of humidifiers to see if this helps a little to at least bring the humidity down. I wanted to see if these would work to bring the humidity down and save on electricity for the people that are poor and cannot afford to pay high electricity bills
@TechReview2000
@TechReview2000 3 жыл бұрын
This is the solution to climate change! Scale this up, and water shortages won't be a problem!
@blackturbine
@blackturbine Ай бұрын
TES1-12704 TES (Thermo Electric Stack) TES1 (one stage peltier) 127 (number of thermoelectric pairs 04 (max current 4amps) This applies to almost all thermoelectric modules TEC or TES is meant for cooling/ heating And TEG is meant for power generation Number afterwards marks how many stages there are TES1 is most common but you can use TES2 to get slightly higher temperature difference it's basically two modules stacked ontop of each other tho one on colder side is usually 1/4 the power due to efficiency of these modules so you sacrafice efficiency. Numbers after the "-" mark number of couples usually only first three and last two numbers mark the current.
@bigclivedotcom
@bigclivedotcom Ай бұрын
That's all useful info, thanks.
@tomnwoo
@tomnwoo 3 жыл бұрын
Thanks for the video, I was looking for a mini dehumidifier for 3-D printing, and was looking at them hoping there was a big Clive teardown so I could see what was inside
@bigclivedotcom
@bigclivedotcom 3 жыл бұрын
If it's for filament storage, I use a large storage box with foam tape round the lid as a seal and a silica gel desiccant block with integrated heater for drying itself out when needed.
@tomnwoo
@tomnwoo 3 жыл бұрын
@@bigclivedotcom Thanks for the reply, any chance of a video of your setup, or have I missed it?
@marcusharmon8389
@marcusharmon8389 7 ай бұрын
Amazon had one reduced from 50 pounds to 30 pound and it collects about 3 x that much it does a litre every 24 hrs which i am well happy with 😂
@MiroslavLah-vm4lb
@MiroslavLah-vm4lb 10 ай бұрын
Deluje na istem principu kot hladilna torba 12 V za v avto.
@patb.1633
@patb.1633 Жыл бұрын
Stupid thing they don't even tell you how to clean the interior of the tank in my manual 😢 I have a good mind to just return it, but it did drop the humidity in the bedroom 59% to 54% or so in just a few hours though 🤔
@jonjohnson1259
@jonjohnson1259 6 жыл бұрын
I got one of these its great works really well it lives in my little workshop I need to change its tank about once every 3 days. Yes it does make a slight 'snuffling' noise when its running but I find it nice
@rokiedecentra9656
@rokiedecentra9656 2 жыл бұрын
this looks like something from the dark web..... how videos have changed
@singwolf.
@singwolf. 2 жыл бұрын
I’ve put in a cold room and the cold side of heat sink breeze
@LeoVideoProduction
@LeoVideoProduction 6 жыл бұрын
If you reverse the polarity on the peltier junction, It won't just swap the hot and cold sides. It will in fact transport heat in the opposite direction but at a drastically reduced rate. They only really work in one way and therefore they must always be supplied as specified.
@platinumsky845
@platinumsky845 Жыл бұрын
You are correct, if you change the heat sinks with larger sized ones in the cold side then you can eliminate that issue. Considering people would likely be hacking these devices for other purposes if they're changing polarity anyways, it's a simple matter to do. The peltier element itself works just as efficiently in either polarity, it's only the heatsinks that make a difference.
@MartynDavies
@MartynDavies 10 жыл бұрын
Clive, a request: I see there are more and more of these things on offer now, how about a teardown? www.ebuyer.com/661756-wall-socket-with-built-in-2-x-usb-charging-ports-ut-86usb I'm interested to know if these just have a crappy capacitive dropper, or whether there's some decent circuitry in there?
@bigclivedotcom
@bigclivedotcom 10 жыл бұрын
The capacitive dropper couldn't be used for the USB power supplies, since it provides no isolation between the high and low voltage sides. These units will basically use the guts of a standard USB charger inside the socket. Personally I don't care much for permanently installed and powered electronics like that. You'd inevitably end up with a double gang socket with two duff USB sockets on the front.
@olliep4023
@olliep4023 2 жыл бұрын
So there's no air flow from the axial fan directly on to the cold side heat sink? The fan just blows air on to the hot side heat sink?
@habrtgt
@habrtgt 4 жыл бұрын
excellent!! saludos desde Perú.
@gf88888
@gf88888 Жыл бұрын
the hot and cold air flows are kept completely separate from each other, not (asking rethorically)
@arunachalpradesh399
@arunachalpradesh399 2 жыл бұрын
hey but how does air from hot part pass to the cold part. the peltier are stuck together. so how does 12v fan passes the air from hot part to cold part
@davidmg1925
@davidmg1925 4 жыл бұрын
Interesting. I was going to have one of these but seeing this im so glad I didn't.
@JohnnyX50
@JohnnyX50 8 жыл бұрын
We had a 'mini cooler' at work until some bright spark switched it from cold to hot while still turned on. A loud bang and flash was emitted and muggins here was asked if i could fix it. took it home, the 'hot/cold' switch simply reversed polarity of peltier and had shorted in the middle, melting on/off switch and hot/cold switch into one blob of plastic, and a very charred circuit under them. I took it all apart, sandwiched peltier between original heatsink and a cpu heatsink, fans on both sides, wired it to 12v cpu header on a spare pc power supply rated over 400w. Fans came on and one side gets lovely and cold and the back gets barely warm given its massive heatsink lol. it now sits in a round cliplock container next to my bed waiting for those ugly sweaty long summer nights blowing a chilly cold breeze across my face :D Instant cheap air con, yay !!
@richardmarkham8369
@richardmarkham8369 3 жыл бұрын
I'd interested to know if the 60W peltier cooler kits on ebay, which appear to be the same arrangement for £14, are any better than these units that cost £40...
@CatFoodDraino
@CatFoodDraino 2 жыл бұрын
Old video, I remember watching it when you published it :) quick questions, do you think think would work better if the heatsink had fins like an air conditioning coil?
@lumen5699
@lumen5699 9 жыл бұрын
I want to know.what the way air in and out in this pleter module?because brusless DC fan is attached on the hot side.but we need cold air.if the cold side of the pleter module is not attached with any fan..how would actually we get.cold air from that.plz pal..I need to know
@KristofKorcsog
@KristofKorcsog 5 жыл бұрын
Guys! Can someone tell me the size of that Fan? 80x80x20mm? Or 120x120?
@twocvbloke
@twocvbloke 9 жыл бұрын
Peltiers are quit fun in the way they work, just really inefficient compared to a compressor refrigeration unit, and it is always a good idea to replace the stock fans on peltier things, I changed the fan in my minifridge on Satuday as the stock fan pushed me to breaking point with the horrible noise it made, I even videoed it too for my other channel: kzbin.info/www/bejne/pJ28p5tobb95e5o
@kreynolds1123
@kreynolds1123 2 жыл бұрын
For the fun of it, try making a solid state dehumidifier. Take two stainless steel screens and place a hydoscopic salt in between. When there's no water the salt does not conduct, but as the salt absorbes moisture from the air it starts to conduct electricity that eventally breaks the water down to hydrogen and oxygen.
@batman9614
@batman9614 7 жыл бұрын
There is no fan on the cold side? would it be more efficient if it had one? Or is the hot side fan circulating air on the cold side too?
@bigclivedotcom
@bigclivedotcom 7 жыл бұрын
It pulls the air in across the cold side before passing it over the hot side.
@MrThunderbolt3
@MrThunderbolt3 6 жыл бұрын
I bet that thing would work in the razor plug in tye shower and would get more water from environmental factors.or if not safe maybe just outside the rather steamy room..just for thought
@BaliDaveUbud
@BaliDaveUbud 8 жыл бұрын
I've had 3 of these for about 6 months now,, that are the same model you broke down.. After a couple months 2 of them have drastically cut down the amount of water they're pulling while the 3rd one is still churning away normally. All fans seem to be operating normally and producing about the same amount of airflow. So I thought replacing the Peltier module would resolve this, but alas no. I switched power supplies and that's not the issue either. And the hot sink on all is still hot and the cold ones, cold, tho only cool on the bad two. Before I junk the two, do you have any ideas as to what I could do to fix these? BTW< thanks for a great video -- it gave me confidence to break mine down.
@bigclivedotcom
@bigclivedotcom 8 жыл бұрын
I would have thought that by changing the peltier elements and PSU you would have covered just about everything. Is the heatsink clean on both sides? Is the inefficiency during a particular season?
@BaliDaveUbud
@BaliDaveUbud 8 жыл бұрын
Thanks. All heat sinks and fans are squeaky clean and operate in the same closet, and are operating now. #3 is doing fine, just like the other two did for a couple months. Now those two now produce about 1/5th to 1/10th as much water as #3. I bought 3 replacement Peltier modules from ebay, so perhaps all 5 (original 2 plus 3 new) are bad, but that seems unlikely. I might get brave and move the one from #3 into a bad one and see. I hate gremlins! I'll let you know if I make any progress, so others will know.
@jpian0923
@jpian0923 8 жыл бұрын
Compare the heat sink junctions of all 3 to see if they are the same...Same gap, same amount of heat sink compound and screw torque etc. And airflow. Something might be blocking airflow to two of them.
@BaliDaveUbud
@BaliDaveUbud 8 жыл бұрын
James, thanks for the input. The heat sinks all look identical and they were all working fine for a couple months. But I didn't replace the heat sink compound on either of those two when I tried new Peltier modules, so perhaps that's the problem. They weren't sticky and the compound did look dry, but I'm not used to dealing with such, so ignored it. I'll get some of that in the next few days and try that -- I'll post back the results. Thanks again.
@BaliDaveUbud
@BaliDaveUbud 8 жыл бұрын
Well that didn't work. I thoroughly cleaned off the old compound and applied new (per some KZbin videos). The cold heat sink just barely gets a bit cool, so little condensation on it. I"m wondering if all the Peltier modules have gotten zapped(?). The airflow coming out of all 3 is pretty much the same and the heat sinks all look clean and unobstructed. BUT the airflow is noticeably hotter on the ones that are NOT working so well, and the hot side is hotter than the good one. Not sure what that means, you or anyone have any ideas? Thanks again.
@SC-hk6ui
@SC-hk6ui 8 жыл бұрын
Great review. Thanks Clive. Surprised at how many of your videos I keep finding :-)
@JessicaFEREM
@JessicaFEREM Жыл бұрын
these are quite handy for drying shoes and such. that's what I use them for at least. in the humid summer months they can bring out about a tank worth a day which is not bad for it's size, but yeah if you need a real dehumidifier you should get one.
@igounfazed
@igounfazed 6 жыл бұрын
I know this is old. But out of curiosity: Isn't water collection dependent upon your RH? If it is not high, then less water is collected. Higher RH, then more water is collected? So, trying to get a lot of water from a 30 or 40 RH isn't going to produce much? (This is me just thinking out loud, please correct me if I am wrong, which I probably am, as I am ignorant with regards to dehumidifiers.)
@lerlo
@lerlo 4 жыл бұрын
I've been using these for like. 7 years... I leave it in a cupboard I keep my. Guitars.... For where I live, SEA, I can keep humidity at 60 percent while outside hovers around 75 to 85 percent... Not bad... they are robust and still works after 7byears, However the adapter have given up on me twice. I think that's because the temperature of the cabinet sometimes exceeds 32 deg celcius, adapter overheats
@fuzzlabrador
@fuzzlabrador 4 жыл бұрын
removes about a pint of water in 10 days from a box room with quite high humidity.
@PTEC3D
@PTEC3D Жыл бұрын
Hey, hi from AU! Somehow missed this video, and nice to watch the teardown, tell you what these little things are great for - I have one in a small 60x60x50cm(ish) file cabinet/drawer I sealed and insulated and keep printer supplies in - where I am averages 75%rh and goes to 85%-90% quite regularly, this thing keeps 35C 35%rh almost all year round and produces a litre of water every six to eight weeks, excellent for old style lead acid batteries and I also use it to keep solder sponges wet and give the rest away to people that still do ironing... It's been going for almost three years now and reminds me why we like solid state devices...
@j67160
@j67160 2 жыл бұрын
Now they changed for 9V adapter, possibly lower voltage for more longevity. Just acquired the same, fills the whole bucket in 1.5 days in my 80% room humidity here, despite that it's not able to lower it as unit is too small for room size I suspect.
@tunespt
@tunespt 9 жыл бұрын
30W peltier? That's like trying to heat a room, even small, with a 30w lamp, you'll never make it, I plan to build one with 600W array of peltier, also, air will cycle from the cold fin and fed into the hot fin, what won't heat the air and make the hot side a lot cooler, making more cold on the other side, I've tested the setup and works. Also comparing this with compressed gas, they consume around the same 600W to be effiecient.
@kyzerSieg
@kyzerSieg 2 жыл бұрын
What type of screwdriver do you used to opened?
@emilee172
@emilee172 5 жыл бұрын
put in a BIGGER device LOL, And if ya ever see them in the garbage Worth taking for the heatsinks
@thunderloong
@thunderloong 7 жыл бұрын
The junction should be located between the screws and the screws should be some non-electrical/thermally-conductive material and there damned well should be a thermal insulator between the exposed metals. Do that and you should DOUBLE the capture rate.
@wdwhitmer
@wdwhitmer Жыл бұрын
What size 12v fan is that? 80mm?
@simonharper4199
@simonharper4199 7 ай бұрын
i like your idea about running off a solar panel. I was thinking the same thing as im aware that these peltier devices are hugely inefficent from an energy perpective. I have a small area at the back of my garage of around 5sq m floor space that is insulated in which i keep my lathe and miller . I think im going to get one to stop flash rusting of the surfaces ( and add around 30watts of heat to the room)
@tomburnham6640
@tomburnham6640 Жыл бұрын
I have the newer version with LED lighting and have yet to find any information about opening it up and as a technician who works on phones, PCs, laptops etc can find no way to open it up. Now its full of dust and the fan needs replacing and I can't open it to do the job. Not pleased at all.
@bigclivedotcom
@bigclivedotcom Жыл бұрын
It will have concealed screws. The puzzle is to find them all.
@krzysztofczarnecki8238
@krzysztofczarnecki8238 3 жыл бұрын
An awful design flaw- the two rather thick screws literally form a thermal short circuit by touching both the cold side heatsink and the hot side heatsink. Maybe you could improve it quite a bit by zip tying those hatsinks instead. I thought that the plastic part would have tapped holes to hold separate screws for the heatsinks and that there would be some insulation, but no. Im going to build one of these becaue I have a Peltier and some old CPU coolers lying around, but I just have to get the cold side heatsink right - too small and it won't collect much water, and too big and it won't get past dew point aw will do nothing. I also think of sucking the air through the cold side, and making it go to the hot side to cool it after being dehumidified - the overall temperature change is unneeded, and the water isn't going anywhere once it is driped down, so it culd improve the (lousy thermoelectric) efficiency a bit. If you look at it this one seems to be doing jthat actually.
@RichardDTube
@RichardDTube 3 жыл бұрын
I have 3 of these, and those screws from cold to hot are nylon. On Clive's it looks like they're metal.
@jonahlefkowitz241
@jonahlefkowitz241 8 жыл бұрын
thank you for taking the time. was always curious.
@anaystorres5760
@anaystorres5760 4 жыл бұрын
my gf shoved the plunger inside the water receiver, any tips for opening the water receiver? thx!
@michaelsullivan7544
@michaelsullivan7544 4 жыл бұрын
Could anyone explain how we get near ice cold temps from the heatsink just using this process. I have a unit similar with 2 heatsinks on the back of the main large one. One gets extremely hot and the other is extremely cold.. Its not adding up in my brain tho.
@richardmarkham8369
@richardmarkham8369 3 жыл бұрын
Google Peltier effect. It's a stack of bi metal thermocouples. If you heat and cool it, it will generate electricity too!
@teastation9396
@teastation9396 4 жыл бұрын
Try taking apart six of them and assemble their innards in a single peltier monster. Then hook it up to your solar panel and see how much water it drips out ;)
@daviddale4206
@daviddale4206 5 жыл бұрын
Has anyone tried water cooling the hot end of a peltier? I’m thinking of a wet sponge on an electric cool box. Surely phase transition should reduce ambient temperature, meaning colder beer. I’d be interested if anyone s done any experiments cos I don’t want to pull my new cool box apart ?
@stargazer7644
@stargazer7644 4 жыл бұрын
Yes, astronomical cameras water cool the hot side to get the cold side down to -40C.
@mohmad2822
@mohmad2822 4 жыл бұрын
Does this device release cold air? I think the air conditioners are enough to absorb moist air!
@GENERALCHAOS13
@GENERALCHAOS13 8 жыл бұрын
i wish i had 2 of those for a Project
@lindab7272
@lindab7272 8 жыл бұрын
Can you tell me if moisture is pulled in essentially from the top or the front. Thx
@bigclivedotcom
@bigclivedotcom 8 жыл бұрын
It's from the front.
@Dingbat217
@Dingbat217 7 жыл бұрын
Yeah if you want a proper dehumidifier then bite the bullet and buy a compressor based unit, the other ones are useless...
@vicudobre5100
@vicudobre5100 8 жыл бұрын
hi Clive. can you PLEASE modified a xbox one power supply from 220 v to 12v and 5v ...supplied by 12v battery CHALLENGE
@cdesigns222
@cdesigns222 5 жыл бұрын
This little dehumidifiers works for what is intended to be used, it will not replace a compressor style dehumidifier, but for small spaces like small RV trailers, it will work perfectly. a piece of foam around the peltier will help the cooling and heat effect.
@BluntForceTrauma666
@BluntForceTrauma666 5 жыл бұрын
You know, I never really thought about using a peltier to _heat_ something. But it would be more efficient than simple resistive heating because you're already getting resistive heat PLUS whatever heat you've got flowing to the cold side of the junction...
@JohnDRobinsonelectronicdrums
@JohnDRobinsonelectronicdrums 7 жыл бұрын
I got the larger version of this after a major leak in the house; it took only two days to dry the carpet in the room affected
@koruki
@koruki 8 жыл бұрын
I have the exact one in my towel closet. It was going alright for about a year then he bearings went on the fan. Just replaced it with a Noctua one. Next I was going to see if I could make it battery powered so I can out it in closets without a power point
@danielhorne6042
@danielhorne6042 8 жыл бұрын
Iv got one of these. I put a mini water pump inside the tank and wen it gets full the pump turnes on then pumps out the water into a larger tank
@DrRobNoble
@DrRobNoble 2 жыл бұрын
There's no fan to draw damp air across the cold side?! Wouldn't it work better if there was?
@bigclivedotcom
@bigclivedotcom 2 жыл бұрын
One fan draws air across both.
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