BUILD YOUR OWN REFRIGERATOR! - SOLID STATE TEC

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  • hummus shotgun
    hummus shotgun  5 days back

    Every TEC based fridge should have its doors opened from the top so the cold energy keeps staying down without pouring out ...

    • Tech Ingredients
      Tech Ingredients   5 days back

      That will indeed make them more effecient, but also less convenient. We opted for the convenience with this build.

  • Tank R.
    Tank R.  6 days back

    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!

    • Quod Magnus Zerum
      Quod Magnus Zerum  1 weeks back

      You could expose the hot side of the tec to a water bath that is in tern cooled by aluminum fins. This would be much like a water cooled computer.

      • Tech Ingredients
        Tech Ingredients   1 weeks back

        That is what we did in the following video on the freezer.

    • nitrous dude
      nitrous dude  1 weeks back

      It’s a pleasure watching you teach. Reminds me of my undergrad in PChem. My guess is you’re an engineer.... but please correct me if I’m wrong! Of course, being an engineer isn’t a bad thing! Just leaves me wondering why I did PChem over Chem Eng! :). Thanks for sharing this.

      • nitrous dude
        nitrous dude  1 weeks back

        @Tech Ingredients just saw your distillation series. Talented man! Thanks for sharing this!

      • Tech Ingredients
        Tech Ingredients   1 weeks back

        Thanks, and no, I am not. But, scientific disciplines are artificial constructs. The methods are the same and the physical laws are consistent across all fields of inquiry.

    • gary warren
      gary warren  2 weeks back

      Another fine video in a string of excellent vids. Thank you for your efforts, informative and very watchable.

      • RJinNH
        RJinNH  2 weeks back

        Wow!

        So much info in this vid and so well presented.

        After the first several minutes, I stopped it, liked and subbed then watched the rest.

        I'm in the midst of a very long and drawn-out SUV/Camper build and was fully intent on buying a Dometic Fridge but now must re-evaluate and possible save hundreds of $.

        This gentleman did a superb job explaining some rather complex and intricate science in very understandable terms.

        My hat's off to you Sir!

        Regards
        Russ in NH

      • Will L
        Will L  2 weeks back

        You're an F'n genius!

        • gotlife Z
          gotlife Z  2 weeks back

          meh apply this with many pieces to an exhoust of your car, what watts you get benefitiant while driving? ;)
          dont make then some sort of h(x)o(y) splitting whit this benefitian power ;)

          • Telmo Monteiro
            Telmo Monteiro  2 weeks back

            I'm so grateful this channel exists! Such high quality content

          • Ryan Gowen
            Ryan Gowen  2 weeks back

            13:39, but wouldn't the intermediate junction metal corrode over time? If it is exposed to a small amount of energy (enough to get electrons to "fall" off the intermediate, but not enough for the electrons to get back up), then it will lose electrons to the other metals until the negative charge collected on the other metals provides enough resistance to further prevent any more electrons from being lost: at this point the difference in energy levels will be equalised, BUT then as contact can be made with a salt-bridge like medium (such as moisture in the air), oxidation will occur for the intermediate metal, as negative ions will happily couple with the positively charged metal corroding it away.

            • Ryan Gowen
              Ryan Gowen  2 weeks back

              @Tech Ingredients Awesome, thanks for the reply

            • Tech Ingredients
              Tech Ingredients   2 weeks back

              The electron flow alone will not corrode the metals. It will only continue as long as a region depleted of electrons recieves suffecient electrons from the available current flow to maintain a stable potential gradient. The junction can corrode if exposed to moisture and competing ions such as salt. That is why they are usually hermetically sealed.

          • Andrew Bagrin
            Andrew Bagrin  2 weeks back

            What are some of the alloys you talked about? Are any available commercially?

            • Tech Ingredients
              Tech Ingredients   2 weeks back

              Thanks!

            • Andrew Bagrin
              Andrew Bagrin  2 weeks back

              @Tech Ingredients Thank you! I love what you're doing! Will look at sponsoring at Patreon

            • Tech Ingredients
              Tech Ingredients   2 weeks back

              Not that I am aware of. They fall under the heading of giant magnetocaloric materials and often have fractional ratios in the alloy. You may be able to obtain tiny samples from chemical companies like Sigma- Aldrich.

          • Jerry Henning
            Jerry Henning  3 weeks back

            This is interesting. Have you considered water cooling? Also, do you suppose mounting a say 1 foot piece of thin aluminum to the cold side could aid in the cooling? Have you considered using these things in conjunction with an ammonia system? Use the hot side to replace the flame and the cold side to aid the cooling of the ammonia?

          • LeanOn _
            LeanOn _  3 weeks back

            Electroboom brought me here

            • Tech Ingredients
              Tech Ingredients   3 weeks back

              Great!
              We're also building a thermoelectric generator, but for a camping application.

          • Jacob Guymon
            Jacob Guymon  3 weeks back

            I feel that the steam from the boiling water near the air cooling test may have thrown off the results.

            • 张纪峰
              张纪峰  3 weeks back

              I enjoy the way how he explain things from the basic theory to the real deep science figures

            • MatMAT
              MatMAT  3 weeks back

              dude, your a diamond, well spoken!!

            • Vapervop
              Vapervop  3 weeks back

              Nice video, but use celsius next time please :)

              • putheflamesou
                putheflamesou  3 weeks back

                So we should sell our frig and hope the good ones come out before we desecrate the planet or do we have to wait for money to play the money grave, I mean game with Earth and all life. We could silence the world and intro The Venus Project and live as if we went to church and were not hypocrites. The least we could do is do it for the youth and just free the old from broke(n) carbon farmed slave populated infrastructure proven unsustainable on a Titanic ride under cloud.

                • SnowblindOtter
                  SnowblindOtter  4 weeks back

                  Why not use corrugated metal heat sinks? You'd get the same overall volume and spacing, but you'd probably triple your total surface area available for heat exchange.

                  • SnowblindOtter
                    SnowblindOtter  4 weeks back

                    @Tech Ingredients Huh... that's all? You'd think the gain in surface area would be large enough to outweigh the other difficulties...

                  • Tech Ingredients
                    Tech Ingredients   4 weeks back

                    I thought about it. The interface at the spacer blocks becomes difficult and the actual surface area gain was about 40%.

                • Raylight
                  Raylight  4 weeks back

                  Get rid of that dumb Fahrenheit scale and use celcius. celicus is globally accepted.

                  • Tech Ingredients
                    Tech Ingredients   4 weeks back

                    Both scales are equally valid. Converting from one to the other is a trivial exercise and it's best to remain open minded.

                • Koito rob
                  Koito rob  4 weeks back

                  I worked in air conditioning and dehumidification for eighteen years, getting out when desiccates where just coming into dehumidification. I understand all of that.
                  What you were talking about went straight over my head!
                  I look forward to seeing the results of your test

                • NickleJ
                  NickleJ  4 weeks back

                  From the moment I learned about these devices, I thought of making a small refrigerator/AC and incorporating more TEC's into my heat sink to power a small cooling fan. No idea if that's plausible or not.

                  • Tech Ingredients
                    Tech Ingredients   4 weeks back

                    You don't want to use the heat ouput of these TECs to drive other TECs to generate electricity. The reduction in heat flow out of the primary TECs due to the thermal resistance created by the power generating TECs lowers cooling effeciency much more than is gained from the electricity generated.

                • Torm Endor
                  Torm Endor  4 weeks back

                  The things I watch at 4:00 am... I came for the electron explaination.

                  • Tokey Ahmmed
                    Tokey Ahmmed  4 weeks back

                    I don't know why I am watching this. But this guy rocks.

                  • Jun Ouyang
                    Jun Ouyang  4 weeks back

                    Question: When you apply forward bias to any PN junctions, shouldn't it cause the energy band diagram more flat (reduce slope/electric field) across junctions therefore releases/absorbs less thermal energy? I mean, why applying more bias will amplify the thermoelectric effect?

                    • Jun Ouyang
                      Jun Ouyang  4 weeks back

                      @Tech Ingredients It is true. But the energy level difference between P doped and N doped will be lowered. Assume increased forward bias, are you saying that the increased energy due to increase in carriers (hence current) outweights the reduction of energy emissions/absorption (due to decreased conduction/valence band difference)?

                    • Tech Ingredients
                      Tech Ingredients   4 weeks back

                      That might be part of the underlying principle and be inseparably tied to the performance of all TECs. Because they are resistance devices, increasing the bias will increase the current flow as well.

                  • Law Abiding Citizen
                    Law Abiding Citizen  4 weeks back

                    0:41 "Every One Knows" spoken like a true engineer.
                    just so you know, most people don't know how a microwave works.
                    so if you think the public understands Phase change you're an optimistic man. LoL

                    • Gorky D
                      Gorky D  4 weeks back

                      The statement serves both as an optimistic euphemism in a time of considerable social stressors and a gentle application of peer pressure to prod anyone who does not understand this principle to quickly alleviate that potentially embarrassing short fall.

                  • Mahmoud Kobbara
                    Mahmoud Kobbara  4 weeks back

                    just wondering about the blue material paper you used at #37:12

                    • whistlesyxter
                      whistlesyxter  4 weeks back

                      Why not liquid metal as a conductor of heat in the back? Much better thermal conductivity. Inb4 "mercury is toxic!" - Use gallium.

                      • whistlesyxter
                        whistlesyxter  4 weeks back

                        ​@Tech Ingredients Yes, I was referring to using it as a thermal interface material to replace the thermal grease you're using.

                        I'm not sure exactly what you used, but most have about 1/8th the thermal conductivity of gallium - You wouldn't need much and it would definitely remove any possible "bottlenecks" of thermal dissipation on the "hot" side of those peltier coolers.

                        There is concern for corrosion, of course - You could use copper plates instead of aluminum.
                        I've noticed that gallium seems to react only temporarily with copper and eventually forms a sort of alloy on the surface, protecting it from corrosion.
                        Between the copper and gallium, I believe you could reach an even better level of efficiency with that unit.
                        Thank you for the content, I love your methods of explanation and hope to use some of them to introduce my sons to science!

                      • Tech Ingredients
                        Tech Ingredients   4 weeks back

                        It has to be contained if you're talking about using it in bulk as a floing liquid. It's also pretty expensive. If using it as a thermal interface material, it is corrosive to aluminum. Gallium is extremely corrosive.

                    • motymen
                      motymen  1 months back

                      tec with cop of 2?? where do you buy those?

                      • Tech Ingredients
                        Tech Ingredients   1 months back

                        No, the opposite. Take a look at our video on extreme cooling. Stacking reduces effeciency because each TEC in a series adds it's own generated heat to the heat that it has to pump through it.

                      • motymen
                        motymen  1 months back

                        @Tech Ingredients
                        So basically stacking them will get you a high cop?

                      • Tech Ingredients
                        Tech Ingredients   1 months back

                        Any TEC can achieve that COP. It requires a small temperature differential and low current flow.

                    • Pulverrostmannen
                      Pulverrostmannen  1 months back

                      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

                      • Tony Wang
                        Tony Wang  1 months back

                        i always wondered, why use flat plates for cooling when "wavy" ones should provide more surface area if the waves in the metal are lined up the surface area should go up with minim increase in used volume.

                        • Steampunker X
                          Steampunker X  1 months back

                          The “practical” volume is not efficient. Most spaces have straight edges. When you need to fit the heatsink somewhere the outer curves of the fin waves on both sides will make the edge limit and so the air volume in the inner curves are wasted (if not the adjacent areas have the same shape). So instead it would be better to put on more straight fins to fill up the entire space.

                        • Tech Ingredients
                          Tech Ingredients   1 months back

                          It's a matter of fabrication effort and expense. Thin flat sheets are the least expensive form. It may be cheaper to simply add more sheets.

                      • RedFathom
                        RedFathom  1 months back

                        What about a passive cooler like the silent flux 134a coolers for the top, or back in this case. Use the characteristics of the Freon to make sort of a thermal diode.

                        • Rogério Costato
                          Rogério Costato  1 months back

                          You r amazing

                          • myke Does
                            myke Does  1 months back

                            You can dump the heat from the peltier into batteries using another set of peltiers mounted to a heat sink, hence you could also cool a second fridge or dump the cold side of the heat sink into the Air. it can also double / triple as a water generator. :) If you do that you want to add a dump load to your charge controller in case the batteris are full and the second fridge is also not requiring energy, this avoids burning out your peltier that is absorbing heat and dumping dc into battery, if battery full no where to dump and system will burn if using solar power or power that does not turn off when system is not demanding power.

                          • thomas beattie
                            thomas beattie  1 months back

                            Can I use two peltier units, with two 120 mm fans, inside as you did, to cool 3 cubic feet with very little insulation? The back is two large heat sinks with 4 120mm fans.

                            • thomas beattie
                              thomas beattie  3 weeks back

                              @Tech Ingredients It looks like I am going to have to use insulation. So I am going to use 1" home insulation foam (that high density pink foam board) and see if I can cool 3 cubic feet with 2 peltiers but the issue I am having is that the cold sink is very cold and I am unable to move enough cold out into the air from the cold sink. After watching this, I need to find a way to increase the cold sink to get more of that air flow over the cold sink.

                            • Tech Ingredients
                              Tech Ingredients   1 months back

                              No, not if they are anywhere similar to the size of the 40mm x 40 x mm TECs we used. The six in our refrigerator with good insulation are enough, but not way more than enough. I would use at least four and the more the better. The whole thing just gets more effecient.

                          • etmax1
                            etmax1  1 months back

                            Not sure I agree that all colours are black in the infra-red. White stones don't melt as much ice as black ones on a glacier and yes the colour you see is not the "colour" in the infra-red, but there are tables you can consult that tell you the efficacy of different materials at IR. We place a bit of masking tape over aluminium to get a more accurate temperature reading of a heat sink with a thermal camera. Black anodised head sinks radiate better and absorb better for example.

                            • Tech Ingredients
                              Tech Ingredients   1 months back

                              Your examples support my point. I should probably have been more explicit and said that all colors of organic based paints are black in the thermal infrared. There are differences in the IR reflectivity of bare metal. Gold, copper and aluminum are about the best. Anodizing, which produces aluminum oxide often with additional dye molecules to generate visible colors, has a lower IR reflectivity.

                          • etmax1
                            etmax1  1 months back

                            thermionic not thermonic

                            • etmax1
                              etmax1  1 months back

                              @Tech Ingredients :-) yes and how many people say nucular instead of nuclear :-) I gues it give me something the comment on :-) Good videos BTW

                            • Tech Ingredients
                              Tech Ingredients   1 months back

                              You're right. I cringe whenever I replay this clip😀

                          • Debbie Bohannan
                            Debbie Bohannan  1 months back

                            Wow I absolutely love your presentation you might be just a little over my head but you give us the real scoop on what is going on . By the way the music at the end was a little to loud other than that you were incredible . Please keep up the videos .

                            • william pelletiervslol
                              william pelletiervslol  1 months back

                              If I understanded the hotter the place where you put the fridge the cooler it can get?

                              If yes im putting this in my server room

                              • william pelletiervslol
                                william pelletiervslol  1 months back

                                @Tech Ingredients ok thx

                              • Tech Ingredients
                                Tech Ingredients   1 months back

                                No. The refrigerator creates a temperature differential and will get colder as the outside tempretures drop.

                            • DIY Solar Power with Will Prowse

                              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

                            • Joel Clarke
                              Joel Clarke  1 months back

                              Great video! Superb. How about making this a water-cooled unit and integrating the heat exchanger into you household hot water system? You could scale that system up to include full-sized refrigeration.

                              • Reckless Roges
                                Reckless Roges  1 months back

                                Cool as the Pink Panther.

                                • Shahroz Mirza
                                  Shahroz Mirza  1 months back

                                  This peltier can give energy to the space ship because of cold temperature in space ... Or it can replace the solar panels ...

                                  • Tech Ingredients
                                    Tech Ingredients   1 months back

                                    It can. Alternatively, thermionic generators are more effecient and can take advantage of the high vacuum of space.

                                • Christopher Roosa
                                  Christopher Roosa  1 months back

                                  How does a refrigerator that doesn't have a compressor work?

                                  • Heshan De Silva
                                    Heshan De Silva  1 months back

                                    Sir,
                                    How did u get the most suitable heat sink
                                    Why did you get a hole block for compress the heat sink
                                    What is the thickness of the Aluminum plate in the heat sink
                                    Can you send me the dimensions of the design

                                    • Tech Ingredients
                                      Tech Ingredients   1 months back

                                      The cross sectional area of the fans determines the necessary, minimal cross sectional area between the metal sheets that comprise the heat sink. From this you can determine the required thickness of the spacers between the sheets based on how many sheets you will use (the more the better). The size of each spacer, beside it's thickness, needs to be larger than each TEC to permit the threaded rods to pass around the TEC in order to clamp the stack. There is a benefit to the spacer being larger than the TEC because that means you have a lower resistance to heat flow, but this benefit improves ever more slowly as the spacer continues to grow. The hole increases the clamping pressure within the stack and allows the thermal grease to flow from between the interface, thinning the gap.

                                  • 78 sound
                                    78 sound  1 months back

                                    I bet you get tools for Christmas

                                    • Douglas Gault
                                      Douglas Gault  1 months back

                                      You might want to try a dust collector on that router table. Great video and informative. Still waiting for performance evaluations.

                                      • Chezare Da Silva
                                        Chezare Da Silva  1 months back

                                        @ 33:40 is the most important part of the video, pay careful attention to what's shown and said.