Reasons why you CANNOT use Peltier for air conditioning 

Nice calculation. But it's better to modify your title of this video. You said it clearly, it isn't we CANNOT, it's just not worth it from an energy efficiency perspective. However, it's hard to deny that there are still user cases where TEC has advantages over transitional measures.

Very good explanation. Only that remember some people don't even have access to electricity(national grid) or electricity power supply is not constant, the only alternative is to use solar or other methods, and since Peltier is DC, it can easily be connected to batteries with solar pv, without considering much of energy consumptions especially if you get rid of using 3.5kva or 5kva inverter to handle the conventional AC.

It is indeed very inefficient for home use, but it works great when sleeping in a tent in the summer. I use a water cooled system I made using 2 peltier modules with one 120 mm fan and an air radiator on the cold side and two 120 mm fans hooked up to a water radiator and a water block on the warm side, there's also a water pump, everything is connected with 8 mm hoses. It's powerd by a li-ion battery I made with 18650 cells. I simply place the warm side outside the tent and it provides cold air throughout the night.

Hello I am just bored on my lunch break with a question. I have a black car with no AC and it gets super hot in the summer. I thought I could make one of these and stick it in the glove box, which is directly below the vent where my car intakes interior air. I do not expect it to blow ice cold like normal AC, not even close, but would it help a little?

I want to cooling for room (10*12*12) size. What is the setup to need for this?

Hello, just one curious question. Can we somehow squeeze out some efficiency using clever control system techniques??

@Curious Scientist im very bad at math, so how many peltiers is needed to match a 0.5hp AC? Lets say tec1-12706 is what im going to use, how many of that is needed to work like a 0.5hp AC?

Finally a great explanation on how to read a performance curve chart, my thanks.

*awesome explanation sir, on how to read a performance curve chart, you are amazing!*

this stuff is above my knowledge base. maybe for air conditioning it might not work, but it WORKS for a mini refrigerator. i bought one for $38 and it works great, it also has a 12 volt adapter plug for using in a vehicle.

what about if you isolate the exterior and the interior? exemple you put it in a window and isolate both sides? will it work?

Excelente video , me gusta mucho cuando la gente expone sus criterios sobre una base lógica , y motiva para que se realicen los experimentos en otros lugares , realizando mediciones y bajo condiciones bien precisas , gracias por su video .

Do you recommend a compressor based refrigerator system for a slushie machine?

Do you think is it possible to use 4 peltier 6A to cool a 1m^3 of a "greenhouse" box I am doing ?

ive actually thought of using peltier as an air conditioner but not for a room just the inside of my shirt... XD

Interesting, if I knew this earlier my A/C wouldn't work! But I use them to chill water and antifreeze in a reservoir, then pump that through the radiators from an old air conditioner and it works brilliantly. Behind the radiator is a centrifugal fan, and the reservoir seems to stay very cold through the day. I must have done it wrong. It also makes a great chiller/heater for my hydroponic reservoir which I keep covered just for humidity reasons. Guess it depends on how you use it, but I remember the old bottle coolers for pop in stores that were filled with water, then paper labels and plastic bottles came along and they faded out of existence. But the idea is still good, and peltier chips are great for those as long as you can vent out the heat efficiently, the faster the better. Cheaper on the hydro bill too, no pun intended.

But could you use it in a ocean cooling setup, where air flows over the cooling side with heatsink fins to ensure max air cooling, and the heat side has heatsinks that have constant cold ocean water flowing over. The only issue is the electricity right?

Thankyou for posting this. Hopefully the countless people who claim to have built air conditioning units with Peltiers on RU-vid will view this first. You are correct, you need at least 2kw of cooling power to cool the average room.

First of all, thank you for this immerse video. I found some issues with your work. Please have mercy if I understood you wrong. 1. The temperaturedifference between the hot side and the roomtemp is a dynamic thing. When you start the system, dT is much lower as 10 hours later, when the object of your desire is colder than before. For my project, I created a linear function for Qc. 2. Peltier-Modules are very inefficient when you let them work at max voltage. If you take a 12715, you should run it at around 6V. Hot side temperature will decrease because you have to transport less heatenergy. 3. Maybe I didn't notice, but you forgot, that the transported heat through the Peltier (Qc) has to be transported through your cooler too. In your example it would mean that the cooler has to transport 225W (P) + 100W (Qc). 4. The maximum dT is defined by how much heatenergy is flowing back in the object that has to be cooled down and Qc. You can't just say that you want a 30K dT and thats it. Your video is really good to understand how peltier-modules work, thank you very much for that. But it has its little imperfections. Please correct me if I'm wrong

If its possible to remove heat from hot side to outside of house then it will work as portable air cooler for one person. Is it possible?

Would cooling an insulated doghouse be a suitable application for a peltier "AC"? Moving 500 W at a 30 degree F temperature difference?

Peltier is very promising as far as advancements. The industry has made great growth in heating at low voltage after decade of research. Problem is, that same research has not been done for decade with peltier technology. We can heat clothing using a 9volt battery but can not cool clothing using a 9volt battery. There needs to be government grants to stimulate research into peltier or other tech to make micro fiber weave that can heat or cool at low voltage.

Hi, thanks you for all these informations. Was clear in my mind that replacing ac air conditionning with such approach was a crazy/inefficient idea.... but I think in my personal case can be an option. Let's me explain more: I am living solar offgrid. In summer, I got potentially plenty of power (not produced since I have no enough loads for). I got also a system collecting some fresh water extracted from my 20m depht well going to the roof (in a close loop circuit) and thx to a water-air exchanger I can breath in all rooms something around 20 C. I was thinking to decrease this Tc=20C with some peltier modules which can be modulated (in intensity) via a offgrod solar power diverter. (that I have).. For some technical reason I can only use some existing 2.5mm wires to power the peltier module... this is why I was thinking to 24V peltier modules.....

Hi there, how about if it was used in a car to support the air conditioner? Car air conditioner stays as is just add the pelier (with heat exchanger and all) with the hot side towards the engine bay and cool side in cabin? Or do you have any other ideas? Car sees 55C climate and in idle the ac pretty much does nothing. I've added an extra fan to the condenser as well and still not cooling enough. No gas leak. Just super hot climate.

Such a nice explanation..

Great video that does a good job explaining the problems when dealing with HVAC. Watts x 3.412 = BTU's a btu is a measurement of heat capacity to remove from a structure. This BTU equation was really the only thing you left out, the load of the structure requires the AC whatever it is to be sized to handle the load. The load isn't the same for every structure. We look for (in USA) a 20F drop across the coil also known as the delta. AC is more or less designed to drop air temp inside from 20F from outside. Desert areas of the climate are different for obvious reasons. Earlier AC's would run a coil temperature of 40F, now the coil temp in some cases may reach the high 40'sF. It's impractical to drop temp below 37F for air conditioning because it's too cold. If sized properly too cold would give you complaints *it's too cold* A typical room of 120 sq feet may require 9000 BTU or more depending on various factors. That's just one room. The larger the structure the more you need, especially if you live in a climate that requires cooling and it's not just considered a luxury that you use a couple months of the year. The larger traditional compressor & refrigerant designed AC systems for residential max out at near 60,000 BTU's (5 tons of AC as 12,000 BTU's = 1 ton of air conditioning.) I had someone contact me due to some click bait article claiming some major breakthough would solve the AC refrigerant problem. I would rather have a click bait title that proves something rather than just feeding the beast telling people what they want to hear. *Great Job, leave the title of this video as it is*

I disagree, in some cases like in most cars, they generate lots of amps from the alternator allowing you to connect Stereo and amplifier systems that consume 1000 watts many times, using a Peltier for AC even when not as efficient is convenient in this situation.

Can we built a Ac using fridge part's like we only change the evaporator and condenser

I don't think anyone is really looking to cool a whole house. I am just looking to use it the cool down the water in my aquaponics water, and lately a 5 X 5' X 5' greenhouse on solar with it. would that be possible?

I respect all these equations, BUT..., I have a fact. I have a house in 320 Sqf inside a ship container, So I setup a split unit 12k btu's and works awesome, but I'm off-grid, so I started trying economic systems. I setup 2 outside boxes insulated with 5 peltier each box with a fan blowing air to inside container with a very nice quiet fan, I'm 2 years without turn my split ac on. Each box with 5 peltier + 2 small fan + 1 medium fan is working with 1 12v/100ah battery. My house still cold sometimes I need turn off. Soooo, for me without calc, math equations I have a nice and economic way for AC with 10 peltiers.

And the answer is "Linear Control", "Kalman Beaucy" and optimization. And in this case you can use the Peltier device for measuring Temperatur difference for the control input.

It depends on the design. If you want icy cold peltiers.the peltier's hot side cools on water, make a container that will fit exactly on window type aircon slot on your window with full of water, put a hole that fits the peltiers hot side sink on water, (so no need for radiators or waterpumps). then attach large heat sink on coldside, only 6 peltiers will be powered up and the 12v turbo fan, then make a large tube that the air will pass only throught the heat sinks then attach turbo fan to suck up the air through the tube. No need for cooling fans for the peltiers just pure water. Then put on a room that the water side part is out of the room and the peltier cold tube is In the room. Like window type aircon. I already tested it and runs smoothly and also cold. On a 3x5 sqm room. For larger room make it doubled.

Nicely explained. Peltier technology haven't improved so much since the first devices, let's see in the future, perhaps if someone develop new ideas. Analysis like this helps a lot to clarify the present situation and maybe motivate someone to break this limits

One more point of view: The thermal power and the electric power 225W + 100W have to be removed from the hot side. I plan to use TEC for my floor heating only to pump energy in the cellar from warm air to the liquid floor heating.

I can understand the cost side of a large project such as an AC or heater, and that it would draw a lot of power. But having one or 2 Peltier models and a few small fans, you can easily make a small desk AC or heater depending on the polarity, and can work well as a small thing to have on your desk for comfort if you can't place a heater or ac unit near you. Or just to make a neat little coaster that can chill and heat drinks.

Nicely done, professor! Too many novices don't understand the math involved, so they make dumb mistakes, the biggest one being ignoring the heat that comes off of a Peltier device. Just because you can generate ice on a very tiny spot does not mean you can freeze the entire room with it. By applying basic math, you have shown the folly of almost all of these RU-vidrs.

Is it possible to use it as aquarium chiller?

Thank you for this great video! I was very willing to use peltiers to cool something down but this video really made me realized that they cannot be used to cool down. But unfortunatelly, I had already got 5 peltiers from the past and I do not know what to do with them. I have researched about what to do with peltiers and noticed that the most logical project is making a refrigerator. Or, what else can I do with peltiers? Everyone says that peltiers takes a lot current and spends a lot energy. Then what is the point to manufacture them? I believe that there can be a valid project to use them and that they are not consuming the energy as much as an iron or a toast machine :) Thank in advance and have a great day!

Appreciate the video! Working inside the house all year led to the insight that CO2 really builds up. Any insight on how to bring new air into the house (specifically into one room of the house) during all four seasons (especially winter and summer) without wasting the indoor heat (winter) or cool (summer)? A fan doesn't really accomplish that. Also, air exchange systems (HRV/ERV) cost a fortune ($3 K - $5 K) when the idea is to get fresh air into one highly used room rather than the whole house. Thank you.

Im making peltier aircon..as of now its 60% done..im an hvac tech ill try to apply my knowledge in it..will post the result after testing

Peltier devices alone are incredibly inefficient, however they can be used rather effectively in an indirect evaporative cooler. Using evaporation to cool down water that's then pumped through a radiator, adding a TEC to the loop would further cool down the water at the cost of double the energy consumption. Is it an AC? No, but it can drop ambient temperature by 30F in a small room. Anything larger than that would be unfeasible as increasing the amount of TEC's in the loop decreases the coefficient of performance well below that of an AC unit.

Only a cold fan could be made out of peltier 😆... you are right. Better to buy an small ac !

What about people using peltier modules to make mini refrigerators - are those realistic (long-lasting) designs?

Old video, but i have gathered so far, the cooler the hot side, the lower the temperature you can get, but also the more power it can pump. I am currently working on a device that has 12 volt peltiers running at 8 volts, and watercooling the hot side as good as i can with large watercooling loop.

Yes thats why most of the youtube videos only use this to just cool a drink or two. Thermoelectric not currently viable for cooling capacity above ~250 Watts .What are your views on Stirling for -80C to -20C cooling ? I think it has potential to replace cascaded vapor compression.

yes this is correct. other alternative is thermal energy using solar evacuated tube water heater and use refrigerant. its like a hvac

but is peltier effective as a fan blowing cold air to me directly?

I realize my comment is a bit late for the video but I did want to mention something. Given that there are operating costs (cost of electricity) 9 amperes would make more sense in the long run for the same cooling (more devices at a lower amperage to provide the same Qc). With that being said, at -30 DT you only use 87% of the power running 9 amps instead of 15 at 15 volts. To make labeling easier Wc = Watt cooling Wp = Watt power 29 devices running 15 volts and 9 amps would produce 2030 Wc while drawing 3915 Wp = 51.85% Wc / Wp 20 devices running at 15 volts and 15 amps would produce 2000 Wc while drawing 4500 Wp = 44.44% Wc / Wp While your initial cost of setting up the system would be greater, assuming fixed electrical costs, over a certain period of time 29x15V9A system would come out on top from a cost perspective. It is still comically far from traditional compressor style AC units like the one mentioned in this video, 2000 Wc while drawing 800 Wp which is 250% Wc / Wp)

The power VS temperature difference graph you use is not commonly found on most of the Peltier device. Most of them give Power VS Voltage and COP vs Voltage.

I use a peltier to cool water in a 50L container, then I circulate the water to the crypto mining servers to cool the radiator that I installed at the back of the server. That way, the cold air flowed by the fans of each server is focused only at the back of each server. For the room I just installed an ordinary air conditioner. But indeed if you want the air in the server room to be cold, then the correct thing is that the hot air coming out of each server is directly discharged outside the room using ducting. This way, not only the chips on the server will be cooler, but the room is also much cooler. But there is also a note, the server room should not only use the same cold air for days, because (I don't understand the cause scientifically) in my practical experience, the psu for each server will be easily damaged if the air in the air conditioned room is not circulated regularly with outside air. The result is that the server room cannot be very cold, because we have to deliberately introduce air from outside with a hotter temperature into the server room that we have cooled using ordinary air conditioning.

He curious. What about using Nicola Tesla's "cold electricity" to move hot to cold and vice versa. Possible? Would certain unique coil designs provide efficient air conditioning, theoretically?

If i want to make a peltier air conditioner for my pickup i prefer installing a second alternator instead of compressor to supply requirement power if even stock power rate doesn't be enough. So it doesn't need piping, R124 and leaking problems,season maintenance and very cheap and simple to make.

What if you use it to cool a small fin radiator(directly attaching it to the radiator instead of a heatsink).. then flow water through that radiator and use a fan to blow the cool air?

Did look into this a little, and for my plan is to build a sleep pod - so much smaller area. Heat venting will be ducting flow into the loft and onto the bathroom extractor vent. That's the plan. Looked at stacked peltiers, though was looking at large slab of metal between them to buffer things out more (all insulated as well). Oh to have large blocks of copper. What are your thoughts upon cpu heat-sinks with heat pipes? Considering large solid block with 4 of those in-line with fans in middle all in a nice box that has ducting inlet and outlet that goes right outside via loft. So for my plans, less than 4 peltiers and really talking size wise a bed sized fridge. Though re-tasking an old PC case and PSU, will be factor, salvaging as much as possible.

If the outside temp is 60 degrees Fahrenheit, and the inside of my room is 85 degrees Fahrenheit, I want as many options as possible to cool down my space to a comfortable level. But you might ask, "Why not just put a regular $10 fan in your window, dummy?" To that I answer, have you ever lived in an agriculture/farm based city? Sure, I could put a fan in my window at full blast to cool my room to the pleasant exterior temperature, but my room would smell like decomposing cow diarrhea, burning rubber and vomit as a result. TEC/Peltier cooling has its place, albeit a somewhat niche product for people who live in cities that smell like rotting garbage. Matching the outside temperature is all many people need... but if the outside air smells obscenely foul (for whatever reason), it would be nice to achieve that temperature without pumping in the outside stench to your home/room. TEC/Peltier cooling can achieve that. Our consumer markets are becoming far too constricted nowadays, and nobody is broadly innovating anymore. Everything is being designed for a small subset of people as "universal for all", rather than society as a whole which has a lot more specific and unique needs.

Using Pelletier is a bad idea, unless you address reasons for its inefficiency.. Causes being; 1. One of its functionalities is an unwanted outcome. To wit, while using it as a COOLER, you will have to dissipate heat, absorbed at cold side. 2. It always produces Ohmic / Joule heating, which is also a menace (while working as a cooler) 3. There is always thermal bleeding between cold and hot sides. 4. Cooling area is very limited or otherwise Cost per cooling area is high. The above said 4 reasons make Pelletier horrendously inefficient (as a heat pump) Personally speaking, working on a project which addresses all the 4 reasons inefficiency. Almost completed it.

i was allways taught if u have lots of energy to throw at it it would wrk but like he said just not eco for some people some have lots of batteries and entergy to throw at it i made one for a science far to prove a teacher wrong but it was really challenging i was able to get it -40 on cold side with watercooling it used a ton off entergy 😊 but awesome video and cheers to all

Could it possibly be used to cool down a 40 gallon plant terrarium? Also, do Peltier devices remove moisture or anything like that? Edit: My best guess is that the cold side could draw moisture in the air. If that is true, would Peltier coolers be bad for very humid environments?

Dear ... What do you think about using a Peltier to cool the water in a radiator, then using a Hall ventilator fan through the radiator?

I'd like to cool the inside of an open cooler and keep microgreens at a certain temperature and humidity. I wonder if this would be a good use of Peltier-based cooling.

18:07 because air is not good at picking up temperatures from solid state object especially when on high flow. How can this be mitigated? I have few ideas but wondering if it will truly solve the issue. Convection isn’t enough indeed And if you do force convection you run into noise problems

Tnx bro i know this video is about a year ago. Hope u answer that. I have 5m to 5m Room and i make a plan To build an ac with peltier Like 20pic of peltier And its easy to cool it and also the power and the price its done I just wannted to know can 20pic of peltier device make my room cool? ❤😍

What are real industrial use cases for these modules?

Peltier elements are commonly used in consumer products. For example, they are used in camping, portable coolers, cooling electronic components, mattress pad sleeping systems and small instruments. some uses definitely won't be suited for large use.

Seems to be an old video but maybe still worth to comment. The temperature difference (and hence heat pumping ability) of a Peltier is proportional to current while the waste heat is proportional to current squared (actually it's worse, as they heat up they also get more resistive). So yes, 225W waste to get 100W of cooling is not worth the effort, but dropping the current to 9A, the waste heat will fall to maybe 60W for 70W of cooling (COP > 1), and dropping this further to around 6A you could get 50W of cooling for 25W input, COP ~2. Now, while 50W doesn't seem like much, if we combined 10 devices we could achieve about 500W of cooling at a moderate cost and COP of 2. Again 500W might not seem like much, but remember that the big reason we need super powerful air conditioners is that we let rooms get really hot and then expect to cool them down very quickly. Once the room is cooled, it often only requires a few hundred watts to maintain the temperature. So we could have these kind of devices running constantly at low power/high COP we could have good overall result. Note also that if only 200W of cooling from the Peltier bank, the COP just keeps gets better and better. The big mistake everyone makes (including in the video) is to push the Peltiers hard. Run them in the 30-50% of spec and they work great.

Personally my interest is on power generation from temperature differences. How much power can be produced? At what cost? And what min/max temperature differences are needed? Does the greater the temperature difference increase the electric power made?

Agree. Compressor is less expensive but very noisy.

Solar panel + electric capacitors + electric coverter 4 medium aluminum radiators each radiator have one cooling fan on it + car radiator liquid + big radiator with big fan to cool all system water + all that will work for 12 thermoelectric peltier each one have heat sink on the hot side with small aluminum radiator to let the water walkthrough it in small box that have a fan inside it to push coold air To the wanted area Note : all the radiators should be insulated with exhaust pipe out of the cooled area ☺️

Really apreciate your knowledge. Buy ac and get solar panels. And forget all the hastle😅

Sir may i ask why 12709 can't turn into ice

What if you use another peltier to absorb the heat produced by it and save some electricity produced by it and put some hit sink on the cool side to maintain its cold side

Running a 12715 on 6A is much more efficient, then you get a COP of about 2 which might be okay depending on the use case. If someone has a very small room it might be a viable option. But ofcourse you'd have to find the devices for a cheaper price. $5 would be way too much.

Couldn't an air cooling unit be made by isolating the two sides properly with appropriate insulation, the hot side making use of heatsink and fan feeding out through a duct similar to how a tumble drier does, while the cold side has a water cooling block attached feeding a tank with a low flow rate pump pushing water from the tank to a loop that is coiled in front of a fan similar to traditional air conditioner units which then feeds back through the water block before passing back into the tank?

I know this is over a year old, but I was wondering if you can revisit this topic, as, I own a cold plate, that can literally freeze a steak, and it's built out of a thermoelectric cooler, and a heat sink. This means, we can get severely cold Temps, and thus, why I thought a small rv ac unit, might be possible from thermoelectric coolers now days. If I'm wrong, please let me know. If they've improved to freeze a steak, one would think that would provide a decent amount of air cooling, no?

You can justify based on: the components are cheap or salvaged free, you can power it with the solar panels, you don't need refrigerant and since the refrigerant gas is now banned to be sold to the general public you don't need to pay for gas recharge made by a certified person .

so the maximum cooling capacity one peltier can offer is just 175 watts?

the delta T isnt as much of a concern unless using as a generator. To drive the unit and use it as heat pump or AC the efficiency of the device is best at 9amperes and below (by your graph) and the limiting factor to cool a room should be around above freezing temperature so lets say at 4degrees C. This keeps the evaporator from icing over. A window AC that creates 2000watts SI (your example) of cooling is not standard by any means frictional losses in the compressor and fan of the unit are pretty high. For me in the US a old standard designed 5-6K BTU window unit uses around 550watts (115v x 4.6A) 5000BTU/hr equates to about 1500watt (SI) equivalent cooling power/hr...That is the part you missed when doing your math (/hr) I think with 12peltier at 12volts and 9 ampere would be a sweet spot since the devices are cheaper than the power transformer to run at high amps. If the use of the TEG unit and the design of the system we are discussing is built for best life and efficiency it has the capability to go above COP1 where the standard AC unit CANNOT! As well the TEG can act more like a invertor driven variable speed scroll compressor heat pump unit it can be set to pace the needs of the space to be cooled with the right control systems in place. I would start with a set of aluminum tanks that sandwich the TEG units between using quality liquid metal thermal interface materials and high temp silicone around the units so the sides cannot transfer temp to one another.. Step 2 insulate the tanks individually very well with 3 or more inches of foam insulation board. Step 3 mount the tanks high on the wall 5-6feet* and plumb the hot tank outside to a large surface area thin design radiator like used in HVAC condensers mounted above the height of the tanks but on the outside wall at a 30-45degree angle this side we will let thermal stratification do the work to cool the condenser applying our hot tank line into the top most section and the bottom to return to the tank. If a fan is needed later we could ad one but since we over size the condenser by so much i doubt a fan is needed. We install a small tank above that hot side condenser to be our fill point so no air is in the system so it can thermosyphon. Step 4 we install a substantially sized automobile radiator below the height of the cold tank, adding high static pressure fan and shroud to get the best results. Step 4 install controls and thermodisk switches for the fan and the tanks to peltiers transformers which shouldnt cost as much as the content creator said. There are transformers that easily do 12v 9amps maybe even wall warts that can do that load for about 10-25 dollars each. Final product is 12x12x9amp 1300 watts plus our fan wattage of 200watts or so. 1500 total watts drawn from the power source and 1300watts directly to cooling with 0 friction or efficiency losses but 10-20percent transformer losses. Brings our consumption up to 1650watts/hr.. Here is where i cannot help without an example but i would like to assume a cop3 is very possible and heating or cooling versions could be built and operated at sub freezing temps like the new style Heat pumps are doing. So we should have ended up with a 15K+ BTU air conditioner (similar to a 240volt ac window unit) but we are below the standard wattage limit of a common US homes 120-15amp standard receptacles safe zone of 1800watts on 14guage wire.. Unless you opted to use 240v AC to DC transformers which would be slightly more efficient and no where near the circuits limits. I 100% think it is possible and you should too. Downside is all the parts which could possibly live beyond the standard 5 years a window ac lasts as well if a breakage occurs your not going to walmart to but a entire new unit you only need the part that broke. The AC to DC transformer and the high static pressure fan might be annoying sound wise but i dont think any more so that a cheap window ac and since you are in charge of the controls you get to play with fan speed, cycle times, and all that jazz. Replacing a like sized 5-6K BTU/hr ac unit would be even less TEG's but i wanted to show a good example of how much more cooling is possible and still be inside of a standard wall receptacles wattage range. For you guys out there that are creating things never let anyone stop you from trying it for yourself!....

20 devices and hidronic project (water pump) works!

I live in 120sq.ft dorm room with two fans, I was initially going to buy a window AC but Air cooler are cheap, small. Also it's kinda illigal to bring AC. I had an idea of using a Peltier for cooling the water to around 18°C or below 20°C, its normally 29°-38°C outside. And I technical have unlimited power (there is no power metre each room there is only one for whole block). Saddly there is no way to get AC facility here so yeah, I have read most of the comments, its not fecal for most of the people but do think fecal for me?, I think I can cool the water to 18°C or lower with 4 Modules? Or is there a more efficient way to cool water? Which is under 150$

your line across for the 80c change ... will result in approximately 5 watts ... or 5v at 1a ... a valid useful voltage AND current and you should be using a LOGARITHMIC scale for the wattage as it changes exponentially NOT linearly since it is a transistor device it has a base value to overcome BEFORE it will function think a diode curve .... to get it on a straight line it has to be plotted on a log scale ...

i just purchased 5 12v 6amp units for $6 shipped so prices have gone down in the year since this was made

but guess what i mad 1 with 2 120watt paltier modules and it works not good as a freon aircon but it works better then the air coolers

It depends upon what's the heat generated in a peltier? If we take second law of thermodynamics the heat generated cant be more than the cooling generated (primary work done). I can explain it thus if a refrigerator is left in a (small) room with its doors open, it WILL cool the room as the heat generated will be minuscule visavis the cooling generated. I dont know how true its for the peltier. Will the cooling be more??? or is it the heat???

Peltier is one thing that can chill your drinks and bake your buns at the same time 😎

Hi, I am trying to build a personal ac for my study room, i am not trying to cool down the whole room but just my study table as i am planning to use the ac at the wall which is near my table, So it is basically like a split ac format, Inside the indoor unit, there will be a copper tube bended like the evaporator( like in an actual ac), the ends of the copper tube is connected to a flexible pipe which is attached to the outdoor unit, there will be 3 cpu fans to push out the air from the indoor unit towards the user( Cool air), there would be a small net between the fan and the copper tube to reduce moisture content, In the outdoor unit, there will be a well isolated container, with 3 peltier module's cold side facing inside it. there is a submersible water pump which is connected to the end of the pipe from copper tube as i mentioned to create a closed loop- water circulating system, 3 peltier modules( tec-12706) is used to cool down and maintain the temp of water, after reaching the desired temp, 2 of the peltiers cuts off and 1 work continuously for an hour to maintain the achieved temp and switches to the second peltier, and the 1st one cuts off, this is repeated in cycle by an arduino for energy efficiency, and ofc there will be 3 radiators which is made to be used with 12706 module, the cold water from the container circulates through the copper tube which will absorb surrounding heat and carry it away back to the container where the water is cooled down again bcoz of the peltier modules. The cooled air is pushed out by the cpu fans towards the user, the outdoor unit is placed at the window. i am using 2l of water for circulation, i don't which know which peltier module will cool down the water rapidly, I am really confused whether if this setup works to cool down my study area, which peltier module is the best for my project? whether if i should use a 12v 29a power supply to power all of this. I could really use an expert's insight, I am just a 14 yr old boy and is interested in this stuff, i hope that you would understand and give me some advice :)

How about using it to cool down a small wooden box for some pet?

Several factors would render your equations false. The main one being the heat exchange. Your goal is not to get -20 degrees surface temperature, but to maintain a temperature elsewhere. Provided that you have a way of pumping most of the heat outside and the cool air inside, the effect is sufficient in operation. I would suggest a water block sandwiched between peltiers and the outer heat isolated and pumped outside. Your math does not take into account transfer or dissipation through certain materials other than the surface of the peltier. Just as the heat and its footprint are expanded to protect the device, ideally so should the cold. Also, your using dc voltage at low amps instead of ac at high amps. Not saying it is efficient, but very applicable with certain dc/offgrid solutions; not to mention the better efficiency of not inverting dc power twice, once at the power plant, second from the wall. Your claims are based on a minute amount of factors and simply proves nothing except that it is possible.

since Peltier plates run on DC power, one may be able to build this using earthen batteries for bad situations. i imagine that freon would be almost impossible to make, without an understanding in chemistry.

my idea to use small car evaporator and water block with peltier when the water gets cold it cools down the car evaporator and we add a fan to the car evaporator so it pumps cool air

Don't look for how it won't work; Look at how to make it work better! In a small space loke a car or small office, this works great if you exhaust the hot air outside.

I think this video confuses efficiency with capability. The displayed peltier cell is clearly capable of transferring around 160W of heat from the cold side to the hot side (less if the cold side is cooler - 100W of heat when the cold side is 20˚C and hot side 50°C). So, it is very clearly capable of functioning as an air conditioner just fine. The problem is that a standard compressor-based air conditioner would use a lot *less* power to transfer the same amount of energy than the peltier cell. Now, 160W transfer is nowhere near the high end of what peltier cells are capable of. Peltier cells capable of 300W of heat transfer exist (those take around 450W of power to do so - very inefficient compared to compressor-based ACs, but still can do the job). There also is a way to bring up the efficiency (although very slightly) by minimizing the time the peltier spends consuming power without transferring heat (when the cold side is too cold) which you can do with a few temperature sensors measuring the hot & cold side temperatures and a microcontroller consuming a few microW on it's own. Compared to a compressor heat pump air conditioner design, a TEC based design will be very space-efficient, which makes it possible to deploy in cases where the former wouldn't be able to fit. TL;DR: Thermoelectric Cells *can* be the basis of an air conditioner and will do everything a standard residential air conditioner does. The only problem is that they'll be very inefficient while doing so. The efficiency can be slightly improved by regulating the power input of the TEC based on hot&cold side temperatures.

You are a real person. These NPCs defending an inneficient tech that doesn't have any prsctical use inside earth are just annoying. We must seek efficiency. Pay a little bit more upfront now, or pay the consecuences the rest ofnyour life.

If it is soooo inefficient, why are still being used then??...and why do you have links to buy them on your description? I wouldn´t send people to buy something that doesn´t work. I plan to build a water cooler using Peltier modules: this cold water will circulate on a spiral coil to cool the air from a fan, and into a small confined, thermally insulated space like 7 or 8 cubic meters. It´s not obviously an entire room, and I plan to use solar panels and a 20 Ah battery for this, during the hottest hours of the day in my country there is plenty of sun to run this and more. Using the thermal mass of the water volume and a styrofoam cooler will allow me to get a consistent decrease in the temperature, hopefully. The main issue, I think, is running the Peltier module intermittently. This way you avoid the severe contraction/expansion effect, and the circulating water in the meanwhile will be cooled by the cold side, until a limit is achieved. Regarding the excess heat, it will be properly dissipated TO THE OUTSIDE, and not to the very same space that those RU-vidrs you mention are trying to cool down!!! A DT of 30 Celsius is A LOT for practical effects. I don´t know why you choose such a high delta. The video is too long, also, I think. It´s all about WHAT THE COOLING NEEDS ARE, and how you achieve it. I have the strong feeling that conventional cooling equipment based on gas expansion is going to be outdated in the near future. Oh and by the way, the initial testing will be with a couple of modules recycled from old cooling equipment :) I will upload it to my channel in the coming next few weeks.

would be suitable for other applications and not necessarily AC for rooms. there is so many applications that one could consider

I should have seen your video first. I wasted money in peltier cooler module , it doesn't cool much.its only good for refrigeration.

there is air conditioning with peltier cells, what are you saying there?

You can get 10 peltiers for 50 bucks, 150W each. But the only problem is removing the heat. One big chunk of alluminium heatsink with 5cm long finns could probably be powerfull enough to be able to removing the heat fast and efficient, also, only with fast spinning fan, minimum 120mm. I do have 3 of those 150W ones and when they are connected all together and everythink works all together , i think they could cool down a 30m2 room quite a bit, yes, it is not a much difference but outcomming air have 10 degrees so.. and now you can imagine what 10 of those will do. They are inefficient that's a fact! but who cares, they are not ment to be used as air conditioning devices, they are way more usefull in car fridges, bewerage coolers etc. But with 10x150W you can cool 100% something, not only your beer but also your house. Paired with solar panels, they could be pretty handy because for the split system AC you need a powerfull inverter and i'm telling you, they are not cheap as you think. Almost every regullar 3 or 5kW inverter shuts down when the compressor in the AC kicks in. You need atleast 6kW one ( only if the AC is 1 phase ) and 9kW when is 3 phase. This minimalize impact on the surge current and inverter won't be able to shut down, for the AC you need a huge power gap sometimes unprofitable, the inverter and AC costs 150 times more than 10 peltiers 150W each. You don't need special electronics. Everything you can now buy via alliexpress and you good to go. 1- 10 peltiers 80 bucks including shipping 2- 2 DC DC regulators 30 bucks ( 1 reg. To each 5 peltiers ) 3- temperature sensor with trigger output ( 10-15 bucks ) 4- wires ( lets say 20 bucks or none when you find them ) 5 - maybe reelay or nothing, you will set it up how you like it In the end you will end up with 300-400 bucks AC system when you also add radiators for liquid cooling, pump,clamps, water heat removing blocks, fans, heatsinks, thermal compound, tubing. 400 for all, atleast 10k for the split system and powerfull invertor ( not to mention money for workers ( when you can DIY thats plus ) and also cables, mounting equipement etc..

Don't understand the charts but my system cost less than £50 and runs off a 200w solar and does great

If you run a cooling block on hot and cool side then the cold side water will cool then run the cool water through a evaporator with a fan pulling through the evaporator

I appreciate your investigation. Thanks a lot. According to Wikipedia The peltier module has the efficiency of heat transfer is 1/4 of the conventional Air Conditioner. See this : en.m.wikipedia.org/wiki/Thermoelectric_cooling