BUILD YOUR OWN REFRIGERATOR! - SOLID STATE TEC
2024 ж. 10 Мам.
1 336 485 Рет қаралды
We review various methods of refrigeration, focusing on thermoelectric coolers. We then explain the engineering and show the assembly of our solid state refrigerator.
If you'd like to skip to the assembly - 37:01
Find us on Patreon - / techingredients
My dad would've loved your channel. I know I do. He was an expert in industrial refrigeration, and I'm a software engineer with a deep interest in physics.
I really enjoy how these videos are the perfect mix of practical applications, engineering principles, and underlying science. You get a cool project plus a good base of general understanding that can be applied to lots of other projects. This is really how I think STEM education ought to be done.
Thanks!
Every time you put out a video, you fucking deliver and never disappoint. The amount of effort to produce content like this is overwhelming to even think about. You got to know your shit in so many fields of science just to keep up with all the research that's going on, then you got to produce the same results in an independent lab without any kind of funding or special access to materials and equipment, then you contribute your ideas to further explore the results and expand the applications of the fundamentals; and if that isn't enough on its own, you somehow manage to produce banger content and grow a KZhead channel which requires filming, editing and interacting with your viewers whom you not only entertain but educate, in a way that is far more effective than any other paid institution and what absolutely does it for me is that at no point do you ask for anything in return, there is nothing behind a paid wall, I don't have to listen to ads from your sponsor, there is no merch dangled in front of me, I have no memory of whether or not you even have a Patreon. All I'm trying to say is that the value you provide and the sincerity with which you do so is unreal. Thank you for what you do, you are an absolute legend
Wow! Thanks for sharing that. We don't sell T-shirts, but if we did, I'd find some way to fit your comment on it.
@@TechIngredients Haha, I was wondering if/how you'd respond to such spicy complements.
Thank you sir, I learned way more than I was seeking to when I clicked on your thumbnail. This is the type of quality informational content we need more of on KZhead.
Agree....kzhead.info/sun/p6eHcaWfi2JuaGg/bejne.html
I deeply appreciate how much you share here for free on youtube. Absolutely amazing levels of detail, clear explanations with context and a very polite manner. I'm just feeling so grateful, thank you!
yes its very well organized and easy to understand it expands my mind even at 75 years old
Can you imagine if we'd had a teacher and science lessons like this dear gentleman creates, we'd have all been successful scientists. I really think people this clever are one in a million.
@@jupitersailing very true! Yet understandable when considering the rare nec chemistry of true, thorough understanding of subject, communication skills to bridge the gap, and the charisma to keep the audience engaged, prepared to receive the info. It's quite an accomplishment evolutionarily speaking to ponder the vast spectrum of personalities that exude that charisma, yet all these nec traits really seem to earn that "lightning in a bottle" level of probabilities (don't let that go to your head, now. Not gonna follow you on tour. Well, we'll discuss ticket prices before any grand statements 🤓).
10:20 Perfect explanation of the peltier and seabeck effects. I was explaining this to my kids a month ago and they've said your example with the foam was easier to understand. Thanks guys
"For you monopole people and infinite energy people" I died 🤣
Zing!
I'm annoyed he bundled monopoles with infinite energy. The former is theoretically possible and believed to exist by many theorists, as it'd explain many things; the latter is impossible.
Unless you bridge it through a quantum tunnel 😝
GRBTutorials.. ahh🙂🙃🙂🙃🙂🙃
@@GRBtutorials Yet somehow the universe has energy. Care to explain why that is?
IS ANYONE ELSE JEALOUS OF HIS HOME WORKSHOP/LAB , I SURE AM ,, AN IMPRESSIVE ENGINEER WITH GOOD COMMUNICATION SKILLS .
Si Simons no cuts in the video but no stuttering and close to no missspeaker. Impressive work! Esp. in this not uncomplicated topic
The windows, tho... non starter for me.
from about @11:25 that's the most elegant way to explain the peltier effect I've ever seen. thank you!
Straight Mad Genius! I can't wait to see the rest of this build. Love the workshop too.
I'm 50yrs old.math top student.i didn't finish school due to migration and need to support family.i started electronics/electric/modifications and creating sense I was a child.i became the one that helps solving electrical issues in new module cars from mechanics at new dealerships and all..... Main point i mentioned this is BC I haven't witnessed kind and honest youtuber sense.... Respect Earned not BC of how many followers or viewers.from honesty and kind to offer your expertise for others to benifit.... Hope we see more videos... Best health/peace and wishes to you and your loved ones.
Hey there, Thank you so much for producing essentially timeless content. I regularly come back and watch again. I always marvel at the execution, detail and effort that has gone into this. And also the entire production & content alongside the house with the manual arts room (so to speak) is the perfect space.. . Just amazing thanks again.
You're welcome.
I was chuckling to myself over this same thought. Every vid I watch gives me that sense of time travel... Only adding to the entertainment to observe the morphology of your mannerisms and the timeless quality of content. We're all fortunate that you get whatever value out of creating and sharing this content.
*Great explanation of refrigeration! Love the project.* ❄⛄
Thank you!
Sit back, chill, and enjoy the science.
@@TechIngredients will there be a part two of this video would love to see the finished fridge with some practical testing like how the real life efficiency of the system, some noise comparison between this and a regular fridge etc.
@@TechIngredients As always, wow. Explanations are great. Suggestion: It would be great to see some theory and calculations for these projects. I realise this may go against the hands on experimental approach, but a snapshot of the calcs and formulas associated with these projects would further solidify concepts being covered. Maybe a brief discussion on a whiteboard, or animation that pops up a certain points of the video. This could be an improvement, but regardless you folks are on the money with your videos.
This is actually a very poor description of refrigeration. A compressor only compresses gas into a hot compressed gas. The cooling of that hot gas causes condensation of the gas into a liquid. Small detail but kind of important. EDIT: looks like you corrected this in a number of other posts.
One of the best tech channels on KZhead (if not *THE* best)! I'm so glad to have found your channel. Another fantastic series. Keep up the superlative work!
Thanks! We're learning and we'll do our best.
What are other tech channels you really find usefull?
@@hetzijzoal My other 3 favorites are AvE, Cody's Lab and This Old Tony, though I often graze through King of Random, Smarter Every Day, etc.
Thanx, wil check them out:)
@@hetzijzoal Oh, yeh - I almost fogot: Jeremy Fielding's channel is a great one for DIY projects on the cheap, but with great explainations of how and why things work.
This is academic level explanations made easy to understand and tremendously engaging
Thank you!
Thank you! This brings me back to lecturing days -- it's like I sat through a physics lecture on thermodynamics.
Put the opening on the top and the cold air will stay in the refrigerator when it is opened.Cold air pouring out when the door is opened is the biggest loss of energy.
We are doing that for version 2.0 which is actually a freezer, but this refrigerator is for daily use in the lab and front loading is much more convenient.
In theory when explaining thermodynamics cold air has no tendency to move from a cold area to a hot area, but instead heat has the tendency to move from a hot area to a cooler area. Orientation of the fridge does not matter when trying to keep the heat out. Nice try, Mark.
@@Standard_Logic Seems the cooler air in the unit would flow out of the front facing door, as this cooler is is more dense than ambient. Similar to a fog rolling off and down a hillside, a bulk flow of a more dense gas. Theory does state that heat transfers from hot to cold, but in this case it is more about the buoyancy of the air. I think this would cause the inside to heat up faster, than if the door were at the top. Same reason the fins on the back are oriented vertically, to promote air currents up and through the fins via buoyant forces.
It will absorb moisture
The moisture will condense and freeze on the heat transfer studs. Two minutes with a hot air gun should be good to defrost. By switching each Peltier off one at a time it might be possible to make a self-defrosting freezer.
I hate peltiers. The efficiency alone made me drop them as a heat pump years ago. I would love to find a way to build a micro compressor system. Super great video as always!!! You rock. Great explanations :D
Hey my last name is pelletier lol
william pelletiervslol well it’s spelt Peltier so not u
See thermoacoustic refrigerators. Not solid state, but can function on the scale of a microcompressor.
Fritz can you dumb it down a little for a non technical and generally stupid person like me please? OR any/some links or something? Thanks
I have the same idea.. ( how to give more than 1 thumb up ?)
Gotta love how for all of the time lapses, he just waited, motionless, partially in-frame for the whole time. From about 26:40, he idled patiently for 8 minutes, then after the temperature passed above 30, put the glove on.
Another fine video in a string of excellent vids. Thank you for your efforts, informative and very watchable.
Man this guy is so freaking articulate and precise when explaining things. I would have payed attention & even learned something in school if I had a teachers like him...
I dropped out of school at a young age, it just was a waste of time at that point as I didn't have the attention to give at that time. I returned to finish my schooling at 22, and found it amazing how well I could learn because I was interested and wanted to learn. I think we all watch this channel because we are interested and want to learn. Not to say he isn't articulate or a great teacher, just that it is easier to learn when you are interested.
@@mukkerman001 Yes Rick, so did I drop out. I wasn't learning very much in high school so I took a trade. After working for several years, I went back to college and did my high school upgrading. Interestingly, almost everyone in my upgrading classes had graduated from high school but still had to take their classes over again because they were not at a level sufficient to continue on to university. I did my grades 10, 11 and 12 in one year (math, English, chemistry and physics). It was hard, but I made it because everything seemed more interesting at college and my instructors were exceptional. As a side note, I went to classes in classrooms that I had built myself.
Great video! I test and calibrate TEC controllers (among other things) for laser mounts for use in optics labs. They range from cheaper 16W analog systems up to 120W digital systems that can maintain ±0.005°C. The demonstration of the thermal energies between two dissimilar materials is the best I've seen.
Thanks!
Excellent video to understand all the variables in cooling systems. Thank you.
LOL, nice touch with the foam particles all over the place, glad to see your sense of humour show through. Great channel! I enjoy learning from you, and thanks for sharing.
I just wanted to compliment your production, very high degree of professionalism. This makes it a lot more understandable and enjoyable. I'm watching a lot of these projects which I call rehashing. I just had to compliment the mitered corners of the foam on the refrigerator and kudos to your son's filming and editing. I honestly think it's the best produced on KZhead. The time lapse extra sped up sequence couldn't be better.
Thank you!
I understand thermodynamics and the Peltier junction refrigerator very well. You did a great job explaining.
Thanks!
No engineer is better than his tools as I always say by my own experience. Very nice explanation and neat project to show the importance of efficiency in this kind of matter
Hands down the best Professor I've ever had. Absolutely love your ability to teach.
You are extremely skilled and smart, thank you so much for sharing you wisdom! Blessings
This is really cool, I've never heard of magnetic refrigeration and, as always, you explain everything so well. Happy new year! and good luck on your projects.
Thank you!
You are absolutely the best teacher I always needed. Thanks for your clear thoughts and methods. Regards.
Possibility the best analogical visualization & explanation of bandgap physics I've even seen- deserves its own video
Two years ago I did the alternate approach, for the sake of lower operating costs. I bought a small phase change chest freezer and replaced the thermostat with one from a refrigerator. That gave it a higher temperature range and turned it into a chest fridge (all for around $200). It uses a minimum of three dollars electricity a month (insulation losses), plus more depending on how much heat is being put into it (from items to cool and warm air when the door gets opened). I replaced the OEM run capacitor with a larger farad value to improve the refrigerator's power factor, but that made the electricity cost go up slightly (lowering VA raised the Wattage). It had condensation issues, which I solved by putting a bucket of "Damprid" inside. Other desiccants would probably be safer for use near food, but the stuff I store in mine is mainly unused laptop batteries in ziplock bags, alcohol, solder paste and occasionally a bag of fast food. A quirk of the compression pump running on single phase AC is that it has a minimum off time. If the fridge is turned off and immediately back on, it overloads and draws a huge amount of current for a few seconds. It takes a few minutes of being off before it can start up successfully. This is because the motor runs on single phase AC and would have zero starting torque (it would never start turning), except there's a trick used to create fake two phase AC with capacitance which adds a tiny bit of starting torque. The "start" capacitor serves a purpose but then it wastes power after the motor gets going, so a series PTC resistor cuts power through the capacitor after the first seconds of operation. After running, it takes time for the PTC resistor to cool down and reconnect the start capacitor. Also, most phase change systems can't run upside down or turned on their side. Standing mine on the side, so the door swings open like a normal mini fridge, would've damaged the compression pump. The lubricating oil in the pump would drain into the compression lines, then the pump bearings would wear out rapidly. That's also why new refrigerators should be unboxed and stood upright for a while before powering them on, to give any oil in the lines time to drain back into the pump.
Why do you store unused laptop batteries in the fridge?
Freezers are optimised for higher delta T and lower power. To run them as fridges are not efficient. You can install a tray on top of the compressor and drill a hole thru the insulation so that condensation ends up in the tray. The heat from the compressor will evaporate the condensation. If you have very much condensation you either have a leak or open the lid to often.
@@Bob_Lob_Law Self discharge is reduced at lower temperatures. Keeping them cold keeps them charged.
@@per.kallberg There was a small amount of condensation, but not enough to drip or puddle. I was worried about mold and I replaced the first bucket of desiccant after six months because I didn't expect it to last, but that was a mistake. The replacement bucket is still fine after more than a year. Eventually, when it becomes saturated I can bake and reuse it or switch to a food safe desiccant. [edit: There's been no condensation at all since putting desiccant in. I didn't spell that out clearly enough.]
I did the same, I run my 150litre chest freezer as a fridge, uses 100watts a day in 30c ambient.
I bet you get tools for Christmas
Tools? This guy needs full-fledged machines.
@@eitkoml Surely he deserves as much, at least!
Kandl 🖒
6 or 8 months back when I first saw this lab and lecture I could hear only high pitch sound after the first three minutes. Today, however, this resonated beautifully. TRULY appreciate what you do for my brain.
Phase lock... Thanks!
Disheveled and covered in whatever you were working with. Reminds me of college... Till I remembered that's what I do now anyway... It's a good feeling to see that go together and look pretty. Looking forward to the data.
Thanks! It's already there in the follow up video.
COP of 2? Man that's way better than I remember when I was toying with Peltier devices many years ago. I figured it was like 0.4 or something. Great video, really loving the content.
I would love to hear more on that too, I had little luck with the efficiency.
Also, the COP of run-of-the-mill cooling devices is about 3. Maybe he's using EER which is about 3x of COP.
The COP of 2 is for the Peltier device itself, not the whole system. It assumes 100% efficiency in transferring heat into the device, and 100% efficiency of removing it to the outside air. It also doesn't allow for fans, power supply efficiency, etc. So, don't compare the COP of a Peltier plate alone with the COP of a complete working A/C or Refrigerator.
Your videos are always amazing. Immensely interesting to hear about the science of these devices. Especially when used for refrigeration. There is a fair few other videos about Peltier effect refrigeration but it's so rare for them to touch on the science, how it works or how to optimize it. Thanks a bunch for making this =)
Sure, and thanks!
A lot people forget to appreciate a solid running fridge, let alone your brilliance of efficient dezine. Nice!
Never could listen to my physics teacher an here I am watching a 40 minute video about refrigeration and I'm fascinated. You are a great teacher
Ok, for the metric people like me, R Value = (F*ft^2*hr)/BTU Our equivalent is RSI RSI= (m^2*K)/W to convert R value to RSI divide R value by 5.68 Where; F=temp in fahrenheit ft=length in feet hr=time in one hour BTU= energy to raise 1 pound of water by 1F m=length in meters K= temp in Kelvin (temp in celcius +-273.15) W= Power in Joules/second I thought this would be easy, but I just got more confused the more I researched it.
Cliffs notes.. how many do I need and where do I put them?
@@LastL33T That should have fixed it, I changed W= energy in joules/ second
BTU/Hr is a measure of power expressed in thermal units also know as the heat flux or rate of heat transfer. (Unit of energy/unit of time) same as Watt is used to express power or heat flux (W=J/s) Joule per second. Also a Unit of energy/unit of time. So for it to make more sense use J/s instead of W. Then the unit of time will appear in the numerator same as in the R value. Something very important to note in both these terms F and K are not the temperature they are the temperature difference. Or delta T. As in the temp on the hot side minus the temp on the cold side, the units are still degrees but using K or C doesn't matter because the difference in either will be the same numeric value. So confusion also comes in because in the US customery units Watts are used for electrical energy rate and BTU/Hr for heat transfer. I could go on but don't know if anyone will even read this far.
@@barrellcooper6490 A Kelvin degree or a Kelvin is the same size unit as a centigrade degree. Celsius and centigrade were once synonymous but one of these two terms is not used so much today.
Perhaps you have a formula that explains why Americans frustratingly cling to such archaic units? I believe one of the variables is Hillbilly Pressure (HBP), part of which is measured in decibels.
I'm very impressed on how interesting and clear you made this. Looking forward to all your future projects! Fun side not my last name is Peltier, I hadn't heard of these coolers until I started my engineering degree (back when the internet was relatively new). I think part of the reason I got my current job is because of my last name and my boss used to be involved in solid state cooling now that I think of it, lol.
Magnetic refrigeration is the *"COOLEST"* physical science tidbit I have learned in quite a while...Thanx very much!
Sure! Have you ever heard of electric armor?
Thanks for putting this up. Very very informative. Great way to teach everyone interested in the field. God bless you.
Thanks for always posting such quality content. It makes it soo much easier for me to recommend this channel to my friends and family knowing that I can just tell them to watch any video of yours knowing they will be getting a great product. Lots of other great channels on KZhead for sure, but I always have to pick and choose what videos to recommend. I can recommend tech ingredients carte blanche
That's a strong statement and thanks!
Your content is always so interesting and informative! Thanks for sharing knowledge in such a thorough and helpful manner. If I ever own property, I'll definitely be DIYing so many things using principles and ideas found on this channel. :)
Than you for your time . Best tech channels one of best explanation I really glad founding your channel. I reached your channel through another channel you commented on that place so please always comment on what you watch And put youryour link also
You are a man who I model my life after, thanks!
4 year of my EE .Everybody talk about AI,machine learning,DSP.... then i see this man with electronic and physics understanding, speak about things i barely hear before ,show concepts throug experiments. Speachless ! BRAVO !!!
Thank you!
due to the weakness of my mind, today I needed a second coffee in the middle :) I love this channel.
To get the university course version, change the speed to 1.25
144p for maximum experience
Also replace every other thing he explains with "if you don't know what that is, you shouldn't be in this class." Don't forget to add in random "as explained in my book"
Speed 2.0 is better
For the ADHD version please use 3x
@@lassef3692 whilst randomly going to 0.25x
I have a Master's Degree in Ed. for Special Ed. and also in computer based instructional design and this is one of the most educational videos I"ve ever seen . Really solid information in a well edited, accurate and scientific manner. I give this video a solid 5 stars! The comments from some are precious and seem just as important. Wow, there are some smart assed folks out there. Nice to see as an educator. Cheers!
His ability to convey information is at an extraordinary level. I had one teacher like him in junior school, but terribly sadly he died very young. He was a clear sheet, letting us kids see through to the information he presented. One in a million.
I really enjoy the excellent content and your meticulous attention to detail. Keep the videos coming! Thank you
Very high quality content ! Always explained well! Impressed :)
Thanks!
Great project and good explanation, I liked it.
Thank you!
great overview! Many people treat peltiers as amazing devices with no downfalls but either don't have the practical knowledge, or mislead people about the efficiency.
geez this is a nice workshop, I wish I had this kind of time on my hands for these sweet projects lol, maybe once my kid is grown
Glad your around, it's nice to learn something on KZhead. I'm opposed to one idiot copying another, and you aren't and wouldn't.
Thank you! Glad you're around as well, KZhead is an exciting paradigm.
I'd like this man to be my teacher. He is, in a certain way, though.
250k subscriberd
@@garybrown9719 ummmm 451K ......you mean to tell me he gained 201K subscribers in 6 days ???!!
Your second sentence, is, in fact, moderately obfuscatory, and lacks taste in its construction.
@@nightwolf137 Your comment is positively resplendent in its comma overabundance, or irony. Of which I can not tell.
@@mikedrop4421 All insults should be this classy :)
I am considered an intelligent guy. When I watch your videos I feel dumb. It is very satisfying watching someone at work that is so supremely intelligent and well studied in what they do.
Wow, thanks!
Man i love this channel. Learning that heat comes off everything as well as watts
Always a treat. An average KZheadr might build a swamp cooler or maybe a refrigerator with a secondhand compressor and components. Going in I thought maybe Tech Ingredients would build the compressor from scratch; however, I never would of guessed I'd be learning about exotic new refrigeration techniques.
An "average KZheadr" doesn't have his money though.
@@GLITCH_-.- or tools (that's a big router table)
this IS NOT new or exotic ....see my comment above this was expensive powerhog
KZhead is an exciting place. There are 2x10^9 people with access to this system and this number is expected to double in 10 years. There may be no really "average" You Tuber, but even if there were ,this will change as the system expands. We have more resources than some and less than others, but in the long run it is intelligence, conscientiousness and enthusiasm that will make a much bigger difference than dollars.I built the router table out of scrap, I didn't say how much the refrigerator cost or how much power it consumes. I havn't even proven that it even works!
@@TechIngredients I found the desiccant refrigeration the most interesting thing. I'm thinking about how to automate a solar refrigerator or A/C based on that. Do you think it would be better to dehydrate the air before evaporation or after?
I think a really cool idea for this system would be to build a back-to-back food dehydrator/refrigerator. This video handles the cool side of things flawlessly. I can't help up think that you could build an enclosure on the other side of the refrigerator, that you can blow air across the heat sink to warm the chamber to an temperature appropriate for dehydrating food.
Based on my understanding of the tech, it wouldn’t be feasible. Now granted I’ve got no idea what temp you’re shooting for with food dehydration, but peltiers really only work by shedding heat to one side. Up the voltage too high on a given cooler, and you’re producing heat on both sides. I’ve discovered this with my own boneheaded tinkering. You’d need a large space that significantly sheds heat from the peltier, while also concentrating the heat that comes off of it at whatever you’re trying to heat/ dehydrate.
Love your videos...I frequently recommend your channel. Your in-depth explanations combined with video help to reduce the learning curve in my visual learners-- I am surprised you haven't achieved your 1 million subscriber plaque yet.
This is the type of content that KZhead should be spotlighting, Thank you for taking the time to share your knowledge. Great project
Thanks!
Best teacher i've ever had, and he is a youtube content creator, more passion in his little toe than all the teachers i have ever had growing up. Love your videos, could listen to you talk about science for hours :) and i have.
Nice!
Loved the video! I'm commenting for the KZhead algorithm.
if it helps, so am I!
Great video! Now I have to find the follow up video to see the results. This is the first video of yours that I have watched and it got my subscription.
You explain the most complicated things within a simplistic boundary that makes it easy for the layman to understand. Thank you!
Sure, thanks!
I came here to see if a Peltier cooler would work to cool/heat a temperature controlled fermentation chamber, and 40 minutes later I now want to build a fridge with those coolers just to see what would happen. I did get a lot of juicy juicy information here. Thank you.
Just found this episode from ElectroBOOMs TEC video (though i have enjoyed many of your videos before). Throwing my 2 cents into the mix, what about a bottom hinged door with side sliders for better cooled air retention when opened? Using the unit bottom up, among other things, would mean the hot air vents are enveloping the unit. Using the unit how it sat when the hjeat sink was put together means cold air naturally dropping to the bottom of an internal container and warm air naturally raising towards the TECs. But it also means lifting the damn thing every time you want (which may help sick gains but slows down getting back to the science). Though if the TEC array was a top mount door, it would cut down on churning the air when opening. Rounded side sliders, with a door that wont open all the way flat unless you make it (push the sliders in or out of their track) would cut down on losing cooled air and keep the hot side air away from the outter walls. I know the video is over half a year old, but just wanted to add to the brain storm a bit. Love the vids!
I'm going to repeat what others said, but I need to! The quality of your content, the effort you go through, your hability to deliver science in an easy way, it is just unreal, legendary, shocking, its a miracle! Thank you for existing and for showing purpose on each word!
Thank you!
I've never quite understood how phase change heat pumps work but you explained it perfectly for me in 1 minute.
Damn, that foam got everywhere!
Really...I didn't notice!
machining foam without a really stout vacuum system is like that.
@@TechIngredients Says the man who tries to spit out a piece of it. ;-) Good video by the way.
Did you just explain how semiconductors work? Because lot of plus and minus signs in paper don't quite explain why electrons go the way they do. I love how simple the cliff explanation is :)
Modern TECs no longer use metal and use semiconductors because they are more efficient. Semiconductors work in a similar fashion, but the electron deficiency/ surplus is achieved with doping and the transition points can be used to produce effects other than generating or absorbing vibrational energy to produce or absorb heat (light) .
Yeah , semiconductors pump heat and emit light. Heavy duty diodes are fabricated to mount the "cold side" to the mounting tab or stud for improved thermal transfer.
Well I just learned about a whole lot of refrigeration methods I had no idea existed. Thanks yet again Tech Ingredients!
Man, you are one sharp dude! I have watched so many videos on KZhead where the creator can't see the tree for the forest. It is refreshing to see someone who knows what they are talking about.
Thank you!
This guy seems like he would be a pretty cool science teacher
I wish you a very good evening too Sir. You are going be listed the greatest KZhead channel soon. Just a matter of time. Take care
Thank you!
Well done...very clear, thorough, no BS - loved it. Thanks so much
I admire the way you are serious & funny at the same time :) And of the content is the best as always, thank you.
39:55 i wasnt expecting a laugh lol. great content anyway, watched thru the entire 40 mins without getting bored. :)
Ok I'm subbing. Thanks for posting on electroboom's channel!
So well explained & easily understandable... Thank you, sir !
You are a really good teacher. I've taught for many years and took mechanical and electrical. I don't think I could do nearly as good a job.
I have a bunch of peltier units for just this sort of project. Your explanations and peltier foam + ball metaphors are fantastic for a visual learner like myself. Definite time compression experienced for the 41 minutes of tutorial. My intended project is a DIY humidor / camera lens "fridge". Do you have any suggestions for reintroducing water vapor to maintain a desired level of humidity? For my purposes, just plain air will probably be sufficient - my local climate is humid enough, however for completeness I would like to manage increasing the humidity directly. I figure the hot side of a peltier could be used to create the vapour with some water, however controlling its introduction back into the system has me slightly stumped. Thank you for this video and your content in general, it's appreciated.
Thanks!
You teased a while back about working on thermal interface materials such as pastes and other such spread on types. Wondering if that was for this project or another? I've seen online stuff like the graphene pads and a quick internet search for performance of thermal paste brings up an astonishing amount of armchair engineer discussions on boards. I think it would excellent to hear your take or maybe even a video. With many such high performance pastes closely guarding their secretive cocktails used to formulate their latest and greatest I think a heavy dose of reality on what is doing the real work would be interesting. Especially like I mentioned since it seems newer types like the pad I mentioned early are appearing in the scene. A pad that is able to be reapplied yet has similar performance to more expensive pastes would be great but I'm skeptical.
Can’t thank you enough for the educational component to your channel. It’s what sets you apart. Just love the science and reasoning behind the project. Subscribed.
Thank you!
Your academic brilliance reflects in your explanations.
Huge peltier blocks are used in polymerase chain reaction machines in molecular biology labs, and also in sequencing instruments (including genome sequencing machines).. these instruments use the peltier style systems for rapid cooling and rapid heating. Reverse polarity switching to have heating-cooling on a single side is a great thing about peltiers. It requires some engineering/thinking to determine how best to conduct heat & cooling, but you can't do that with compressors without major re-engineering. These instruments are used for melting DNA strands apart by breaking down it's base-pairing hydrogen bonds which happens at about > 92C - 95C and then when cooled, the bonds reform at about < 60C - ish (depending on the DNA sequence), effectively glueing it back together. #TechIngredients -- how well would your box act as a food warmer if you switched the polarity (even if it was horribly inefficient as a warmer)?
It is fairly easy to create a warm and cold plate. You use liquid cooling and direct electric heating or two separate liquid flows if the cycling needs to be very fast and controlled. To use TEC in the way you explain in the sequencing machines results in problems with condensation. That can be hard to solve. It works as a good food warmer. It transfers a small amount of heat from the room to the food and thus increase the efficiency slightly if you want the cooling of the room. As explained in the video the warm side gets the electrical power and the pumped heat. The TEC has a upper heat limit that is not as high as ovens.
@@per.kallberg those problems are solved, yes there's condensation. It's not a huge issue though as there is a heated element in the system to drive off a lot of moisture, but it doesn't affect the cool block. As for the warmer, I asked how well does *their* fridge perform as a warmer. I never said anything about an oven.
Kieran Short Well I didn’t know to what temperature you wanted to warm your food and an oven is an excellent food warmer. It also works in the complete temperature range usually associated with food and looks remarkably similar to what this video describes. The baseline to your question of good food warmer could thus be an oven. A TEC cabinet could work just as good or slightly better if you don’t mind the cold side and the condensation issues it brings. But I will give you a hint to answering your question. No one builds food warmers from TECs. Why should they be inefficient warmers? They work excellent as warmers.
Pelteir devices are more efficient at heating than resistive heating because they pump heat from one side to the other plus offer resistive heating. but their hot side temp limit should not be exceeded
If you look, Coleman made a cooler that also would work as a warmer. I got mine as a gift for 15 years of service.
39:55 You wear that foam well sir!
One of the best videos I've found on the basics of refrigeration and cooling systems. Learned about kinds of heat transfer systems I've never heard of before, such as gadolinium magnetic refrigeration. Just that makes me imagine a futuristic cooling system that transfers heat with magnetic-fluid-filled conduits.
Thank you!
Thank you so much for an awesome explanation, looking forward to the results
Excellent presentation! I'm looking forward to the next video. We have had a peltier based travel unit for a long time and it works great, however, its cooling/heating ability is limited based on ambient air. I hope your design is better!
I wonder, does space suit has these sort of Peltier systems to cool or heat the astronauts in space?
Happy New Year Usual-presenter and son-of-usual-presenter :-) (btw paul is a much better videographer than his old man )
There’s a second son in the mix (me) that does the video work. But thanks anyways! I’m always glad to be improving :)
@@TechIngredients wait a brother of the son of the usual presenter ? just how siblings of son of the usual presenter are there???? the world needs to know :-):-):-)
Your teaching style is fantastic! I learned a lot. Thanks
that was the best explanation of how a peltier device works that I have ever seen, thank you!
Sure!
Cool video. I see there is a hole in the spacers, I guess you have determined that the surface area is good enough with the hole and went for lighter. How did you determine that? Do you have enough experience to know that or did you do a back of the envelope calculation?
I also noticed this and was wondering at the reasoning behind it.
Yeah me too, seems strange
The lightness is an advantage, but the removal serves to increase the pressure on the interface without exceeding the limits of the TECs. This reduces the thermal interface resistance and mitigates the loss of the cross sectional area of the aluminum. The hole makes it possible to produce a flatter surface from the stock aluminum bar from which the spacers were fabricated. There is always a bow in the stock material.
@@TechIngredients Thanks, it makes sense. Stupid followup: why not start from a tube and do all ops but the drilling on the lathe?
« Cool video »! Was that pun intended? Regardless, you made me laugh😂😂
Best Peltier cooler vid ive seen to date.
I love it man!! I am currently going to hvac classes I learned more on this video than I did with all the credits I got now!!! Wish u could give me some one on one training!!!
Best science and engineering channel on KZhead. Most other channels produce novelties, where Tech Ingredients does specifically meaningful, goal-driven technical accomplishments, complete with a thorough scientific explanation. 10/10. Highly inspirational.
Thanks! That indeed is the balance we're aiming for.