Peltier cooler-based air cooler

[@bertzerker747]

40% of the energy bill is on the heat exhaust. Run that into a terrarium to raise the practical value. It can even thaw out a frozen roast and hygenically incubate biltong/jerky ☝️ Maybe only one radiator is required with one pump making up for the extra work. Much enjoyed, thanks 🙏

[@CuriousScientist]

Hi and thank you! Yes, it could be better if we could recycle the heat but that is true for basically any heat emitting devices.

[@bertzerker747]

@@CuriousScientist To agree... since starting play design with these devices my mind is never made up, do I want ice-cubes or toast. Now I see a budget TEC on my supply list that have good thermal to electrical properties. Therefore could run some of the peripherals installed in the right place. Seeking out heat sinks for thermo generators. Good luck with it bro. From this video you gave me an idea to PWM the devices supply and tweak it without an oscilloscope by just a JK reading. They really need PWM to purr out loud and for longevity. The PWM offers an adjustment in stack or stacked heat bridge. I like the heat bridge assembly over stack in any event of malfunction. I also like to use different metals for their thermo-junction properties. They can build them to custom perameters if you're willing to order that many.

[@ajaynarayan3127]

Just what I was looking for ! Great video giving experimental insight alongwith phased Data readings. Would have liked a final screen-shot of entire Data reading block in a chart-form. But that's only a suggestion. Thanks for sharing...

[@CuriousScientist]

Thanks! As I said many times in the video, visit my website. You'll find the chart there. ;)

[@arvince99]

I haven’t read all the comments but I’m wondering if you could sandwich a water block in place of the heat sink and run the cold side to a smaller radiator with its own pump and fan? Also extend the hot hoses and move the hot side radiator farther away and see if that makes any difference. Maybe make it like a mini split and have the hot side radiator outside. Just a thought.

[@CuriousScientist]

I made a video on a similar system. No, it doesn't make sense. A lot of Peltiers are needed for noticeable cooling effect.

[@isidoromaich7226]

28:36 and a window AC is more efficient than a portable because the portable exhausts the heat in the same room that is trying to cool

[@CuriousScientist]

In that sense, yes! But you can have these flexible pipes and put them in the window. Some of these mobile units even have some thick curtain-like stuff for the window, so you can seal off the open window while using the exhaust.

[@zenile7087]

Hi from France ! Thank you very much for all this bunch of thermoelectric knowledge ! I have read that some radiators made of aluminium and copper piping are able to catch the air's moisture and prepare a highly pure and valuable water. It's always a pleasure to follow your projects !

[@CuriousScientist]

Hi and thank you very much! Yes, if you manage to cool the radiator below the dew point and you have enough humidity in the air, you can do it. There is a similar project on my to-do list. I basically want to make a device that does the exact same thing that you just described. I have a somewhat similar heat sink channel for it that I showed in the video. I just need some time to assemble a system and prepare a few things.

[@WildRapier]

Could you reverse the current through the peltiers to chill (not freeze!) the water and use that to cool a CPU/GPU water loop?

[@CuriousScientist]

If you reverse the polarity, the hot side becomes the cold side and the cold side becomes the hot side. Furthermore, it does not make sense to use Peltier coolers for cooling CPU/GPU cooling loop. I made a video of a similar case and explained why. Search for it in my channel.

[@arontozser]

Hello! Jo a video! El lehet valahogy erni Teged? Hasonlo megoldast szeretnek leimplementalni, de specialis korulmenyek koze. Tudunk valahogy beszelni? Koszb

[@邱傳育]

冷氣也不是依靠強力氣流來冷卻室內溫度的，正確算法應該是數十顆製冷晶片接在一起同時運作，根據我換算過這樣的套件至少要8組同時運作，然後散熱片移到室外才有機會。 冷氣出風溫度也只有8～12度而已，由於冷氣的出風是集中式，跟散熱風扇的擴散式不太一樣。

[@CuriousScientist]

我不明白中文。我会说英语。。。

[@MeisterQ]

Could you tell me why it is a bad idea to put the radiator + fans outside the window, and let the peltiers inside the room to cool it down? Lets get an example: im using 12 12706 TECs. so i place heatsinks and small fans inside the room with small waterblocks on each. Then i bring the warm water outside the window like at a split AC unit. I think you said once its a bad idea, but i dont know the video.

[@CuriousScientist]

It is a bad idea because you throw out 85% of the used electricity as heat. Peltier coolers are inefficient, and they are not really good as air conditioner. Your proposed system with 12 units will probably work, but it will use a lot of electricity and will provide much less cooling power than a regular AC.

[@paulgray1318]

In middle of building a sleep pod and near on all the parts for the peltier cooling - my plan was use old PC case, adapter for the PSU to break-out the 12v, 5v 3v rails (can get adapters that do all that nice and cheap) large heatsink and 2 peltier's stacked and inside PC case - cool side and hot side with cheap ducting and recycled pc fans for the hot and cold air loops. Did get a very large over spec heatsink for the hot side. All this sat inside that old grey large tower of a PC case and tada - saved some corners. Should work well enough to cool a largish sleep pod and then the real pain of noise and too hot or cold when sleeping will become less dynamic. But reusing old parts that many chuck away can save lots, also remember that CPU heatsinks with heatpipes have been optimised for cooling hot surfaces so those can be reused nicely for something like this. Still, one thing I do want to do is get solar panel and few car batteries and make those moments I need for cooling, less impacting fiscally. Though way things going, probably get it done in time for Autumn/Winter - chortle.

[@CuriousScientist]

Stacking Peltier coolers in a bad idea for this purpose. You limit the cooling power by the bottom Peltier already and the top one does not do anything useful in this sense. Use them side by side. But only 2 Peltiers will not do anything noticeable in my opinion.

[@LawAbidingCitizen117]

I'm amazed that your room temperature hasn't increased a bit! It should've increased by a tiny amount because you put the whole system (including the heat emitting power supply) close to each other, in the same room! I think if you use hundreds of TEC1-12715, you will get the temperature increase that you want.

[@CuriousScientist]

I see what you are doing here, I've been following your comments on my channel since the first one. But I think that you are misinterpreting my experiments, probably because you don't watch them carefully enough. The room temperature increased by 1°C. I explained in the beginning that the warm air from the radiators is actually being pushed out from the room, towards the right side of the video. I also _ALWAYS_ emphasize, that I am not trying to cool down the room as I am not able to physically separate the cooling side and the radiators. I am always looking for the temperature differences between the inlet (or room, depending on the system I built) temperature and the outlet temperature. Ultimately, the goal is always to create a temperature drop with the cold side of the Peltier cooler, and based on this drop we can estimate the performance. It does not matter if you try to cool a 35°C air to 25°C, or a 25°C air to 15°C, you will need the exact same amount of power (Q = c*m*dT). And this is why I always measure and report the room temperature in all my experiments, so the viewers can get a feeling about the real temperature drop. Depending on the system I build, I also measure the temperature of the heat sink that is attached to the cold side of the Peltier cooler. With this data the viewer can get a feeling about the "cooling capacity" of the cold side. I also showed this in the beginning of this video where I started the experiment without starting the fan on the cold side heat sink. Trust me, I know what I am doing. ;)

[@pauljohnsson2927]

Im confused, are you cooling or heating the radiators? I thought the cold side should be on the blue blocks and not on the heatsink to make the radiators to blow cold air?

[@CuriousScientist]

No, that is totally wrong. The blue blocks are attached to the HOT sides which then go to the radiators. The Peltiers produce an enormous amount of heat and you remove the heat by using the radiators. The heat sink could not cool the Peltier coolers at all.

[@joshkelly3743]

I want to see this thing used in a small sleeping pod recirculating the cool air. I find myself here looking at how to cool a 4'w x4't x8'long insulated box to sleep in using my solar for power

[@CuriousScientist]

Probably a small insulated box would be okay. But probably you would need more than one unit.

[@joshkelly3743]

@@CuriousScientist do you think 240w would be enough to cool that much space? Thinking about using them as a dump load for a solar storage system

[@CuriousScientist]

I don't know. You can calculate the heat loss of the pod as well as the heat that you put in vs. remove from the pod and then you will see if 240 W cooling power would deal with it. If the pod is well-insulated and the only heat source is a sleeping person, then probably you could make it reasonably cool. Keep in mind that you typically cannot reach the maximum values provided on the Peltier cooler's datasheet, so you might need more Peltiers than you would expect. A lot also depends on how well you can cool their hot side. Another thing: this device is noisy as heck, like a hairdryer. Some people like the white noise of the hairdryer, but maybe it is not the best in this case. :)

[@davey2k12]

Flip one side of peltier you wud have hot and cold water lol wonder if be more efficient water heater than kettle element if it's modified to your frezzer lol

[@CuriousScientist]

Yeah, maybe, but the side which would make cold water would overheat very quickly since its hit side is poorly cooled.

[@carwerks101]

Thank you for this video, I am looking to do this but it will be hooked up to a helmet for racing to help decrease temps inside a helmet, perhaps voltage could be switched and blow warm air also

[@CuriousScientist]

This is way too large to directly attach it to a helmet, and you would need to get the power cables and the water cooling pipes to the unit as well. It's quite messy, in my opinion. If you want to switch to heating, then you would need to flip the polarity on the fly. An H-bridge could do that for you.

[@carwerks101]

my plan is to build a box for it so that it can easily be transferred between vehicles with a hose blowing air into the helmet, I have been collecting parts and im about to build it on the bench soon. @@CuriousScientist

[@CuriousScientist]

Why don't you just use this exact product with a hose extension? You only need to solve the cooling of the Peltier coolers somehow, but that should not be too difficult. There's enough space on the backseat (or its place) of the car.

[@carwerks101]

that's exactly what im doing . :D@@CuriousScientist

[@carwerks101]

@@CuriousScientist I went with the 4 module style, I want to be able to use the 12v outlet in a car and not have to connect directly the battery, so I need to be conscious of the amps

[@paulpease1788]

Hi! Been awhile since we spoke. Lots more subscribed now. This may be a dumb question... If you ran a NEGATIVE 3V and a 12V+ supply to a peltier would we be able maintain the positive current supplied to be higher than the standard 9V DC supply? My thought is that more Amperage and lower voltage will generate colder temperatures because the Wattage would be lower which reduces Joule heating but Amperage would be higher than at the 9V • camps alone. There is a problem with the Resistance of the peltier increasing substantially as it has a higher DTcold thus reducing the Amps and performance. I'm sure it won't work like I think but I want to know why.

[@CuriousScientist]

Hi! Long time no see, indeed. There is no such thing as dumb question! Voltage is all about references as I understand it. Voltage is often defined as potential difference between two points. And potential can be imagined as kind of a work needed to bring a unit of electric charge from infinite distance (or a reference point) to the given point in an electric field... In electronics usually a _common_ reference point is the ground (GND) which is often picked as the 0 V too. So, if you put a load between the -3 V and the +12 V points, the load will experience 15 V and if there is enough current can be provided, you will probably be close to fry the Peltier as 15 V is usually around the max voltage limit of them. I believe that you have a misconception here (or I have?!). But, I am pretty convinced that my thinking is correct here. For example if you take a split rail PSU which has +/- 12V output, then you will be able to measure +12 V between the +12 V rail and GND (0 V) and -12 V between the -12 V rail and GND (0 V), or in this case, you can flip the probes and measure +12 V, but that's cheating. However, if you put the multimeter between the +12 V and -12 V rails, you will measure 24 V. You can imagine it as a rubber band that you can stretch in two directions. You extend it symmetrically both ways 12 centimeters, the total length will be 24 cm which is proportional to the total tension stored in the stretched rubber band (this was kind of an analogy to the voltage). Unfortunately, there are no simple workarounds for Peltiers. They beave as resistors, therefore they obey Ohm's law. You cannot reduce the voltage and expect _more_ current by any means. The only way to make Peltiers better is by inventing better materials.

[@paulpease1788]

@@CuriousScientist So, even though it "realizes" 15V it will produce the same Amperage as 9V? I hate rules and especially laws. Mr Ohm should have just minded his own business and let me break tons of natural laws!

[@CuriousScientist]

@@paulpease1788 It will produce the equivalent current for 15 V. If the load is 1 Ohm, then 15 A will flow, supposing that the circuit can supply 15 A.

[@paulpease1788]

So what materials are not used because of various reasons (too expensive, radioactive, explosive...etc) ​ What would make the best peltier devices humanly possible. Something that would create enough resistance or generate more heat on one side and yet something with extreme low resistance to be able to accept more heat for transfer to the other side. Heat is sort of an arbitrary word. What is considered as hot is heavily subjective. I enjoy being in the shade on a warm 105°F Arizona day. (it often gets even warmer than 120°F or 50°C.) I think it's also comfortable at 18°C. Others may find one or both of those as unbearable. All that just to say I appreciate the factual information and showing how the actual Delta of temperature is effected with power settings @CuriousScientist

[@deejii]

Hello! Can you give me advice about peltiers. I have little air cooler with stack of 3xTEC12706 atx power supply voltages 3.2v, 5,2v and 12.2v. I want try put more power for cooling. I was thinking just replacing them with 3xTEC12715 , or maybe stacking them top- 12715@3.2v , mid- 12706@12v , bottom- 12715@12v. Or what is my best option with this type of power source? Sorry about my bad language and messy question. I donated for your super work here :) Thanks

[@CuriousScientist]

Hi! Thank you for your contribution! Your language is perfectly fine, I understood everything. I think that your concept is not the best. Not necessarily wrong, but could be improved. If you need cooling power, then you should *not* stack the Peltiers. Stacking gives you larger temperature difference between the bottom and the top Peltiers. But, the heat that you can remove from the system that you want to cool entirely limited by the cooling power of the bottom Peltier. And in addition to this, you waste most of this cooling capacity by removing the Joule-heat of the other 2 Peltiers in the stack. There's only a very little capacity left to remove actual heat which cools your system. Try to increase the surface area and use several, individual (not stacked) Peltier coolers. Make sure that you cool their hot side very well, and don't run them more than 50% of their max rated current (e.g TEC12706 should run at 3 A, TEC12715 should run at 7 A.....etc.). You can use a DC-DC converter to limit the current by limiting the voltage that you supply to them, or if you have a 12 V PSU, you can "chain" them on the PSU. One link of the chain is two identical Peltiers in series. If you put them in series, they will experience half of the supply voltage, around 6 V and this will limit the current too. I made a lot of videos on Peltiers, so I encourage you to check them. I discussed all these issues: serial or parallel wiring, stacking or not...etc. I hope it helps!

[@colinhamer6506]

hi I've been messing around with the idea of using peltiers for a few years with many uses in mind have you considered doing it the other way around using them to cool the water and use the radiator to cool the air

[@CuriousScientist]

Hi! Why would you add an extra medium to the cooling system? It is just adding losses.

[@colinhamer6506]

imagine this a well insulated water tank

[@CuriousScientist]

I am trying hard to imagine it. What am I supposed to see?

[@colinhamer6506]

@@CuriousScientist a insulated water tank filled with antifreeze piped first to a radiator with fans for cooling a room then piped to Peltier water block on the cold side ideally placed outside cooling the fluid before it returns to the tank the pipes would need to be insulated and have a radiator bypass valve for getting the fluid super cold and a big positive it's all DC and if you can get the wattage down it could run for a day or two maybe more from a few car battles and with power cuts happening more often it seems a sensible way to go

[@colinhamer6506]

I'm thinking of it more from a energy storage point of view drip energy in a benefit later

[@masterdebater8757]

The surface area of the cold side exchanger is very small.

[@CuriousScientist]

It's not like I made it this small. This is a product that I purchased. Nevertheless, the Peltiers can't really keep up with the airflow even with this smaller surface area.

[@jvmiller1995]

very interesting for sure. Has anyone place one under the hood in the intake. Cars run better when compressing colder air.

[@CuriousScientist]

This can not cool the air at such pace as the car consumes it. It would not make any difference.

[@jvmiller1995]

@@CuriousScientist That was pretty much my thought. But I thought I would ask. I had not watched all the video when I posted either. thank you for the fast reply. I came across this looking for the stuff to make a small chiller for a tig torch. I can see it would most likely not keep up with that kind of heat, But it is the first time I have really looked at this tech.

[@CuriousScientist]

It is a very interesting technology, and it has its own niche use, but when it comes to big volumes of fluids, it is pretty much useless. It just can not provide the necessary cooling power. And when we look closer and look at the efficiency, the information is even more disappointing.

[@jvmiller1995]

@@CuriousScientist Well thank you for the reply. I am going to sub and like for you. I love watching people that build and invent thigs. I will explore your channel.

[@CuriousScientist]

Thank you! I hope you'll find interesting things. I will also upload some interesting stuff in the near future. Stay tuned!

[@نايف-ع3ن7ك]

If you want good results you must put the hot air away from the cooler like ac external unit and inside the room keep cooler this will make difference but keeping both hot and cold side near to each other this won’t give you any results at all

[@CuriousScientist]

I know and if you actually watch the video you will see that I talk about this thing...

[@MelvinPhuti]

What is the cop in this case? Would a water cooled system like this have a cop higher than an AC? I imagine a pipe loop with the water tank sitting outside under a shade, or a loop running underground (geothermal with peltier) surely that must have a crazy high COP as compared to an ac?

[@CuriousScientist]

I don't know the COP from the top of my head, but you can look it up on the datasheet of the Peltier cooler (TEC12706). I disclosed all parameters in the video (current and voltage). I think there is no way of reaching a better COP than a typical AC. Peltiers are super inefficient. Also, if you can afford to drill down for geothermal heat, you can afford a normal AC and run it from the heat pump. This device is just for cooling down very small volumes of air and it is not an AC for a room.

[@creativity4you83]

Can we try this project on the top part of an actual air cooler to see if it actually cools down the water in an air cooler and makes the air cooler much more cooler?

[@CuriousScientist]

You could improve the performance of the demonstrated system to a certain extent by cooling the water loop better, but the transferred heat would not really change too much. So, it would not make too much difference in my opinion.

[@jec_ecart]

Hot side outside the room, and 2 or 3 of these "blocks" should cool a small room. Only problem is finding good genuine Peltiers.

[@CuriousScientist]

You can find genuine Peltiers if you are willing to pay the price. :) BTW, 3 of this block with all the cooling system and power supplies would be really expensive.

[@jec_ecart]

@@CuriousScientist even after buying from a premium source most Peltiers are fake... QC is a huge problem.

[@sepahimohamad5541]

hi, i want to make an A/C for my car with tec peltiers, i need to say : 1- i can not use the compressor because my car is loaded nearly 4000kg when im driving 2- i can get 45 amps from battery 3- the temprature of the outside is 40° celcius most of the time 4- i need the outlet temp about 20° do you think its work ?

[@CuriousScientist]

Hi! I don't know because I have never built an AC for cars. But if you only care about the outlet temperature, then this device or its larger version could work. But you will need a quite substantial cooling system for it, and you'll also need to regulate the power. Probably the voltage of the battery is too high for running the Peltiers "efficiently". Don't expect miracles.

[@sepahimohamad5541]

@@CuriousScientist i will test it and let you know if it worked. thanks

[@CuriousScientist]

Thanks! Please, if you really test it, send me the results. It would be interesting to measure power consumption, inlet and outlet temperature, cooling time, and so on. Would help other people, too.

[@johanbekker8103]

Can you share links of the products

[@CuriousScientist]

Have you tried reading the description of the video?

Bạn không thể để dàn nóng và dàn lạnh trong cùng 1 phòng được ...như vậy nhiệt độ sẽ bão hoà ... và không thể nào thay đổi được nhiệt độ mong muốn...m

[@CuriousScientist]

No one said that you should. I always emphasize that this is just a demonstration experiment and not how it should be applied. It is kind of common sense that you should expell the heat _outside_ the volume (room, box, container...etc.) that you want to cool.

[@CodEnrico]

Very interesting experiment. Did you test at any point how efficient Peltier elements can cool down 1l water? Like how long does it take, how many elements to archive a significant temperature drop in 3 min? I'm Planing to build a bottle cooler with Peltier elements and think about 18 elements attached to a aluminum plate (100mmx350mm,) to cool 1l water. Hopefully from 25C° to 5C° in 3 or 5 min

[@CuriousScientist]

Yes, I did, and it is available in the Peltier cooler playlist. Take a look.

[@corretor.rony.10421]

Can you use a 19v notebook power supply to activate Peltier without damaging the tablet?

[@CuriousScientist]

No, 19 V is too high.

[@FlyKool1976]

I would like to support you by requesting if you could design some plans for a particular project I'm doing. Is that possible?

[@CuriousScientist]

Hi! Sure, just contact me via email, and we will discuss the rest there. The contact form can be found on my website.

[@androidlover9791]

Thanks for making such a wonderful video. will this type of system work for small dog house (PUG dog breed) ? small A/C's are not sold in india best i cant get is 1Ton ac for around 405$ and power consumption is 938W . price is not much of issue for me its just power consumption and size since its very hard to fit inside small dog house . I was looking for solution which uses half power and is much smaller . My room temp is 40°C and i'm hoping to get 21°C .

[@CuriousScientist]

Hi and thanks! I believe that this could work for such small volumes. However, based on the comment you wrote, you might have some misconceptions about the Peltier coolers. Yes, they take up much smaller space than the traditional compressor-based coolers, but they are also much worse in efficiency. So when you expect them to use half the power than the AC you found, you should also expect them to provide much less cooling power. Nevertheless, for a small, insulated dog house, Peltiers could work. I would however not use this specific Peltier air-cooler because it would be somewhat difficult to install it in a dog house. It is noisy, and the fan would not tolerate the dog fur on the long run. I would sandwich the Peltiers between two large heatsinks where the cold side is inside the house and the hot side is outside and it is also equipped with a cooling fan.

[@androidlover9791]

​@@CuriousScientist Thanks i really appreciate your response. Peltier coolers are really bad way to cool but this is best what i can get for smaller areas in my country so sadly i have to stick with it but if you have better alternative i would be happy to implement .

[@abbu8779]

Actually peltier modules are 2 percent efficient so 420w × 0.02 =8.4w of actual cooling capacity that 420w is power draw ok

[@CuriousScientist]

Maybe they are a bit better than 2%, but yeah, one has to pump in a lot of energy to get some cooling power that makes sense.

[@abbu8779]

That's close to 2 % if we include wiring and other factors than it will be 2% only

[@lostworld-2024-m5m]

There are many things that people never care about. They buy a car and use it as a lorry .I won`t go into all those silly things that they do to stay on topic here. Before anyone want to put a cooling system in a room , they first of all insulate the room to be sure that no heat from outside gets in . That room must have air tight doors and windows to get the utmost of your cooling Systems. ( A refrigerator is a perfect example of what I am saying ). Your Peltier stuff should have stand alone in one room and all of the heat sources ( power supplies and radiators ) in another room for your tests . Second thing people must keep in mind that cool air stay on the floor and hot air will always go up to the roof. So this is why you may see in some places you may see the air cooling unit on the floor , the unit keep pulling cool air on the floor and push it back to a lower temp. where as the one on top will pull hot air to cool it , this makes a big difference in the pocket at the end of the month . Putting an AIR CON. in a kitchen is an idiotic idea . Better to put an air extractor at the roof and and one inverted at the bottom to pull fresh air inside .Still I have seen people using air con in kitchen , and then say " oh my god ," looking at his electricity bill at the end of the month That experience that you made ( even you said that the radiators should be out ) does not suit what the audience watching that video expect as result . So in fact you lost your time in doing all this, and it proves nothing good about Peltiers functionalities . this video is a TOTAL misleading one for your audience . In fact a very good butcher dose not mean a good surgeon . Electricity is one thing and air conditioning is another thing , if you want to master both you should study both before combining them .

[@CuriousScientist]

I think you haven't watched the whole video carefully. At least that's what your comment suggests. Peltier coolers will never be suitable as air coolers or conditioners due to their low efficiency and cooling power. Even if I fully insulate the room, and separate the hot and cold side, that 1-200 W cooling power won't make any difference. Cheers!

[@lostworld-2024-m5m]

@@CuriousScientist I watched the full video . and I will stay on my comment that you made it wrong . I said that people buy a car and use it as a lorry . " do you understant that phrase ? If yes so tell me what does it means . Waiting for reply

[@CuriousScientist]

It means exactly what I tell in this video. Peltiers are not made for air conditioning. 😉

[@sermadreda399]

There is high power peltier cooler modules some can cool a large room ,you can search youtube

[@CuriousScientist]

Of course, but check their price and power consumption. :)

[@Aaron.A22]

You can improve the cooling if you use two other radiators for the cold part instead of that small fan , the cells would be like the compressor of a normal air conditioner , but you would also have to put other of those blue heatsinks for the cold part of the cells.

[@CuriousScientist]

I already tried such a setup, but it would not make it better. It is just the type and amount of Peltier coolers in the setup that is insufficient.

[@Aaron.A22]

@@CuriousScientist Did you try also stocking the Peltier? 👍🏼👋🏼

[@CuriousScientist]

Yes, check my videos. Stacking them does not improve the cooling power but it leads to lower achievable temperatures on the top of the stack. The cooling power of the stack will always be limited by the cooling power of the bottom Peltier cooler in the stack.

[@Aaron.A22]

@@CuriousScientist Ok , then you need to try more cells and especial coolant not water, and better air flow with an impeller maybe 🤔😀👍🏼👋🏼.

[@CuriousScientist]

What do you mean by coolant? There's nothing better than water (for domestic use).

[@ericgillespie2812]

So i did some light googling and have found that that an average peson gives off 330 btu per hour or about a hundred watts. Does that mean to feel a cooling effect you need to have a little more than 100 watts of cooling?

[@CuriousScientist]

Hi! No, that is not how it works. To feel cooling effect (in general), moving air (simple fan) is already enough since the increased airflow increases the evaporation from the surface of your skin. You do not want to cool the body, you want to cool the air that passes through the heatsink. Also, there are other losses than the heat dissipation of the human body. This gadget just makes cold and somewhat dry air which can make you feel more comfortable.

[@ericgillespie2812]

@@CuriousScientist Another question I had is should the heat radiator be outside? If its inside arent you just feeding heat into the system of the room?

[@CuriousScientist]

Of course the heat should be dissipated somewhere else, in a different place.

[@ericgillespie2812]

@@CuriousScientist excellent I thought as much. I was thinking about insulating my shed and making a cooler for it. Ill give this a shot and ill update you in the future with my results. Thanks for the replies!

[@CuriousScientist]

Looking forward to the results! Please watch my video/videos carefully for ideas in order to avoid common mistakes. For example, do not run the Peltier coolers at their maximum rated current (run them at ~50-80% of that), cool their hot side as good as possible...etc.

[@manishmandal-78]

Some more money added to the price of that radiator, smps and pump will buy me a new air cooler.

[@CuriousScientist]

Exactly, that's the point. These devices are not made for this task and it is better to invest in a regular AC.

[@xfire9233]

Whats the size of fan on cooler and cfm?

[@CuriousScientist]

I don't know, because I don't remember all details. But you can open the video, open the link in the description and open the product's link from my website. The original Aliexpress page of the products should have these details.

[@raymondtan-co3in]

I don't think you understand how to cool the hotter side. You can mount a large heatsink and place it under water, submerge in the water maybe 2 liters of water and put 1-2 pump going to your radiator. It will make better cooling.

[@CuriousScientist]

I don't really understand what you mean. The hot side already has the water cooling block installed, so the most straightforward way is to attach a water cooling loop with a radiator to it. Where do you mount the heatsink you mentioned and what cools the water that is used to submerge the heatsink? I don't really get it.

[@henrikansorge3461]

Hello @Curious Scientist, thank you for all the effort you put in these awesome videos! I'm currently planning to build a two-stage peltier- freeze- dryer to filter out the remaining H2O of a glovebox with a nitrogen atmosphere. But I'm worried how to cool the peltiers best: One wants to keep the peltiers hot side as close to room temperature as possible as the dewpoint would be at around -60°C and therefore will need very good insulation. CPU coolers with heat pipes work best at higher temperatures as they just start working at 25°C depending on the liquid filling so I would opt. for water cooling. Do you have any recommendations for radiators in order to keep a stable and low water cycle temperature? Maybe there is no point in trying but I'd like to test it and follow up on your experience.

[@CuriousScientist]

Hi! I haven't tried any other products than those which are shown in my videos and all of those products can be found on my website in the "Tools" page. I think this radiator would be sufficient as I was able to reach below -40°C with a smaller (240 mm instead of 360 mm) radiator. -60°C would be challenging as that is approaching the edge of the capabilities of these coolers. Maybe a stack of 3 Peltiers would be needed. Once I tried cooling a Peltier with dry ice (-78.5°C), but I was not even able to reach that cold with the Peltier cooled by such temperatures... Maybe I was not doing the things correctly or something, but as far as I know Peltiers become less and less efficient at lower temperatures, so this might have been the reason.

[@ohm.3768]

But if we connect 10 to 20 in series I think it will cool down a room😮.

[@CuriousScientist]

Sure, sure, we can think many things. I think your electricity bill would be sky high, and the cost of components would be more than that of a commercial AC unit...

[@ohm.3768]

@@CuriousScientist no a standard AC consume the power of 2500w but this can overall consume 600w only

[@CuriousScientist]

10-20 of this? Your math is waaaaay too wrong. One of these units consumes around 420 W. 70 W of each Peltier (6 Peltiers per unit). 10 units would be 4200 W. And the cooling power would be just a fraction of a commercial AC.

[@ohm.3768]

@@CuriousScientist naah man use a power supply with output of 12v 50 amps it's Power consumption is 600w and each peltier is running on dc not ac so use this formula p=vi. And according to google peltier consume 40w so each peltier consume 2amps from dc supply. 10 peltier will consume 20 amps! The way you are sayin 4200w means you're directly connecting peltier to AC supply

[@CuriousScientist]

At 12 V, they draw almost 5 amps. Just look at my measurement or look up their performance chart. Also, you meant Peltiers, but I meant the unit with 6 Peltier coolers! I thought you want to use 10 of those. Nevertheless, 10 Peltiers is not enough. They provide maybe 20 W cooling power each. So, 200 W is nothing...

[@ytkdmr]

bad design. you have lots of heat transfer between hot and cold sides of peltier via metal connecting stripes and screws. isolate them well.

[@CuriousScientist]

Tell the manufacturer. :) Btw, those four screws per side barely contribute to the loss...

[@LawAbidingCitizen117]

Agreed. Every experiment he did on peltiers was purposefully designed to make them seem worse than they actually are. Here for example he put the cold and hot side in in the same room and close to each other, then complaining the room doesn't get any cooler.

[@CuriousScientist]

What are you talking about?

[@Shrisinger]

personal suggestion buddy,ur stretching it to long plz make it shorter so that people will not get bored,as i am concerned,and do not forget to show the wiring at least.

[@CuriousScientist]

The connections are always explained in the video, and they are also very simple since I just directly connected the Peltier coolers to the 12 V power supply. Regarding the length, I am okay with long videos, and I don't care if people get bored.

[@DarkAlpha6]

Add more water in bottle you'll get better results

[@CuriousScientist]

Why would that yield better results?

[@jmjav04]

Use coolant diot

[@CuriousScientist]

I tried to Google it, but I could not find any coolant called "diot". 😏 Also, could you please explain how a coolant would help? You sound smart.

[@countmorbid3187]

Cooling power of 2KW while only drawing 1KW? Seriously? 😂

[@CuriousScientist]

Who said that?

[@countmorbid3187]

@@CuriousScientist You did ... literally ... Watch the end of your own vid.

[@CuriousScientist]

Oh, you are referring to the AC? What's wrong with that? An AC can _move_ more kW of heat than it consumes. It doesn't violate any laws.

[@Hieu_Tom]

17:20

[@CuriousScientist]

What?

[@lostworld-2024-m5m]

I subscribed and gave a like , Hoping that you may help me in case I need some tips about electricity or electronics . I will probably take of some electronics parts from some old PC power supply to make a voltage regulator to charge Batteries from solar panels . Hoping you did not get me as a bad guy due to my comments .

[@CuriousScientist]

Yeah, no worries! Constructive discussion is always welcome.

[@Moddaibaas]

Bro refer what is close system 😂

[@CuriousScientist]

What?

[@Inarilein]

I thought the black thing was a grenade.

[@CuriousScientist]

I don't deal with such dangerous things. 😄