This is like building a portable cellar. Except instead of the natural condensation in a cellar, you have to add water occasionally. Awesome rediscovered tech. This is my new favorite channel.
Nice! Use aluminum for the interior pot and it will get colder. Put black sand on top and evap will increase as will cooling. 😎 Throw in a slight fan will increase evap as well. High humidity will decrease evap thus decrease cooling so it works best in low humidity.
It won't get maximally colder with the Al pot, but it will transfer the energy exchange faster/more efficiently. Since the system isn't well insulated from ambient temps, doesn't matter too much, because you constantly have warm air getting back into the system, which will equalize the temp of the Al pot. Basically, there will be no difference of total energy exchange, just different rates of relative cooling and heating and time of same.
Zebras also have stripes because they heat up differently and create eddies and currents of air around their bodies, cooling them by up to 3 degrees Celsius. Something similar could be done inside the pot fridge, on the wall of the house, or the cooled room behind the stove - different materials, colors that have different thermal conductivity and different shapes that direct and distribute the currents.
Again a blindingly informative video. The temperature differences achived depending on the outside temp a nice curve ball to the quoted stats of insulation companies. Love it. Please keep doing what your doing as i throughly enjoy your uploads
You could NOT possibly know how much your videos mean to me ‼️‼️‼️❣️❣️❣️❣️ You teach me GREAT living skills and Scotty teaches me how to care for my vehicle MYSELF 🥳 I'm a 73yr. old lady and pretty much by myself.... THANK YOU ❣️❣️❣️❣️❣️
I used to use a zeer pot in my camper (caravan?) If I remember correctly Mother Earth News said to soak the outer pot and keep it damp to aid in evaporation. Once its operating the outer pot stays slightly damp. they do a decent job and you dont need to worry about ice but like you said they arent as effective in humid areas. You can help them by blowing air around them..
Traditionally in India that's how people used to cool water, many people still use it today, It's called a 'Matka'. It's a porous clay pot, made of black soil. Street hawkers also use it to keep 'Kulfi' , which is an Indian ice cream, cool and prevent it from melting.
Awesome upload! Thank you very much Robert!! These things are going to be fantastic for putting on the window sill.... And I will have to tell my Dad who's living in Spain!!
When I do archery in the field, I usually take a bottle of beer with me. To keep it cool I wrap a wet microfiber cloth around it and secure the cloth with a rubber band or two. After shooting for 2 to 4 hours my beer will still be quite cold! Boom! When I go camping I always have one or two microfiber towels (the ones you use for drying the dishes) with me. They're so handy.
I'm curious if hemp cement pots would work better and last longer than Terra Cotta? Hemp Cement or Isochanvre basically calciumates and fossilized over time making it last for thousands of years. Homes are now being built again with this hemp cement mixture which keeps the internal temperature comfortable throughout the year.
Recently I changed my path and decking at the back of my house for black block pavers, I know this is going to sound strange but in the summer all I had to do is spray them with a hose and they cooled the garden and now i's got a bit cooler they are heating it. The effect is quite noticeable because they act like a sponge to water and a fantastic heatsink (when dry).
Thank-you very interesting. It reminds me of my grandma she had a terracotta bottle cover for the milk. She put the milk bottle in a bowl of water then the cover on top. I don't remember ever having milk that had gone off.
Fill the center with wet Oasis and put it in front of a window with a cross breeze and you have a handy air cooler for your window for those summer days where the heat is not on your side.
I used to live in a house made of wood, straw, and clay with no air conditioner, and it stayed cool entire summer. Not sure why they don't use this technology anymore...
I'm So wanting a Cob House!! They're a bit labour intensive to build,but well worth the effort!! Thank You for sharing this with us All 💞 Namaste 🙏 Andrea and Critters. ..XxX...
I used to live in one wood straw clay building from 1860. It was always cool in the summer with just the right amount of humidity inside. On our new farm we hve brick walls and added woodfiber plates and clay to all walls facing outwards. Oh and we integrated heating/cooling loops that are hooked up to a heatpump running at35°c. The whole wall can breathe and it was just as easy to build as modern building materials. Clay is quite forgiving and can be locally sourced and using wood fibre panels makes it super easy to install. Waaaay better than rock wool. All this to say at least in germany it's possible and still done.
That’s a good one. I was fan of evaporative cooling for housing as it’s very dry here in some parts of Australia but I discovered that it can be too dry and hot which means you use more water than you can afford to loose which is why people in those areas actually prefer conventional refrigerative type A/C. Something that I once wanted to try for cooling items was to have a very well insulated tube/tower with an access door at the bottom and a parabolic dish on top as large as possible with hole in it to collect cool air as you know cool air is heavy. Of course it would also collect water unless you had a drain with a floating ball valve at the bottom that will not allow the cold air to drain out. I have no idea if it would work well or not but if you think it’s a worthy experiment then I’d love to see you try it out.
Love to see what improvements you can come up with based on this old tech. Maybe a outer cabinet with a fan to draw air past and increase its cooling capacity... This kind of old school tech can really change people's lives with the increasing cost of living for those still on the grid.
I agree and I like the suggestion you made there mate - I guess we could increase the evaporation rate and so the cooling effect by something as simple as making the outside black
@@ThinkingandTinkering I did experiment with a black outside using BBQ paint, as it still allowed the moisture escape. I was planning to then use Solar reflectors, akin to solar cookers, to intensely heat the pot to measure if it increased the inner cooling.
many years (about 1970) ago I made a ccd camera for astronomy where a peltier device was used to provide a low temperature to reduce ccd noise and the first time I heard of one.
Similar effect, I've been doing some serious labouring/building work in this recent heat, in a sun-trap/beer-garden, people are fainting in the heat while doing nothing. All I'm doing is running my cotton T-shirt under the tap, wringing it out, wearing it. Sorted. Personal 'air-conditioning'. It last between 30-40 minutes before I need to recharge it, but I can labour all day in comfort.
Mate this is quality. I bought a cool box with a peltier in it and the cooling was horrendous. They said it would keep all of the food cold. The food was always hot, it never called properly and the condensation inside was terrible! I could do with a new fridge made out of a plant pot. Going to carry on watching now ;)
This principal is not new, when I grew up in the 60's we had a clay pot made by the black peoples in South Africa and fired in an open fire to hold it's porosity. That pot kept all our drinking water nice and cool all through the day by the evaporation of it's contents. The blacks have employed this principal for many, many years to keep their drinks cool and it works a treat. It was a very nice video in any way please keep them coming.
When the temperature drops below 30 degrees Celsius - you can light the rocket heater you made with sand and place pot fridges around the heater. This will ensure a sufficient temperature gradient. 🙂It is an exaggeration and at the same time it is not.
@@ThinkingandTinkering Or place the stove against the wall, make the whole wall or part of it as a double wall of pot fridge and one room would be heated and the other room cooled. Something like this.🙂
So, can it be scaled to be around the house? Or at least make something that circulates air in it, or maybe a coolant, to create some sort of air condition unit from it?
There are what was called swamp coolers around for along time and for awhile now, I've been seeing ads for small units. They uaually start by saying something like "cool any room in 5 minites". Of course you can start cooling, but not cool said room in 5 min. and if your adding humiid air, it will prob feel worse over time unless your in a dry area. They are used alot in green houses were hunidity isn't a problem.
@@putteslaintxtbks5166 Yeah, if you were in a more humid area, you would want to put the evaporation unit outside, increase evaporation somehow (solar panels+fans?), and rather than directly blow the cooler, but humid air in, you would want to cool some kind of contained solid or liquid cooling exchange instead, so that you're not adding to the overall humidity. Most swamp coolers directly blow the cooler, but damper air inside, which is fine if you live in a very dry climate--actually can make things more tolerable if its desert like. But even in the desert, these things can get real nasty pretty quick as far as microbial growth.
Sliding your beers into wet socks and hanging them from the car mirror will chill beers in 20 to 30 minutes. Dont drink and drive! A good breeze works well too.
Try a white styrofoam lead for the inner pot and set it in the sun with longer strips of Oasis hanging over the sides shading out the outer pot The Oasis gets hotter and increases the evaporation process but both parts stay cool I got to try that
Decades ago the magazine 'ScientificAmerican' had an artical about a multi-layer 'Peltier' device that could get down to -40C (and better). It might be worth another look. Sorry I don't have more details, yet. I'll do a bit of digging.
What I'd like to see is some of these things mixed together. Maybe have several devices working together, the paint cooler, the plant pot cooler and the TEC if you can get it to run off sun or off your burner.
that's amazing, using that principle would make a great small house project, in desert/hot areas. just supply water between the inner and outer walls to keep the interior cool without expensive air con.
@@ThinkingandTinkering I live in Las Vegas, Nevada. The water level in Lake Mead, a major source of water in this part of Nevada, is at a historic low, with no signs of improvement. The reservoir is now below 30% of capacity. Restaurants only provide glasses of water at the table upon request, and the Valley Water District has recently raised the fines for wasting water. Fines range from $80-$5,120, depending on the amount of waste and the number of violations. In other words, Nevada, Arizona, and other states in the this part of the US are in a condition of drought, and while a more energy-efficient cooling system would be nice, increasing water use is probably not the best idea.
I sort of knew about these things before but I had no idea they were so effective. Why do we not use this technique for cooling houses in hot climates?
@@ThinkingandTinkering A shame. I live in Sydney Australia, and it often gets to be over 30C here sometimes over 40. Even a few degrees would help. Maybe it's too humid for this to work.
I have seen a video of a company in India that makes square terracotta 'fridges', evidently it uses the same principles you are talking about. Evidently they are very effective and most popular in rural India where there is no power. Great presentation. P.S. they described using this principle in the P.O.W. camps in WW II using wooden boxing from food packages and hessian cloth.
I took a coolbox and installed 3 40x40 fans, 2 peltiers and 4 mini heatsinks, used a female usb-c and made a mini fridge for 20$ that i can connect to a fast charger or my 40w solar panel.
Back in the 60's when we were poor and had no fridge we used to use the kitchen sink! We would put the milk in there (remember glass bottles with the great thermal conductivity?) Simply chuck a tea towel over and run a few inches (yes we were in inches back then too) of cold water in and Bingo! you had your free cooler. OK Peltier time ....... You say that you can get 15 degrees cooler on the inside compared to the hot side, but that is relative! Cool the hot side and you cool the inside even more. Your oasis should work well clamped against the hot side and with the base in water! Or you could put several plates face to face (hot to cold obviously) you would then multiply the heat difference!
you would - but only so far as you kept the hot side cooler and a Peltier transfers heat so the hot side would gradually get hotter unless you actively did something to keep it cool - so maybe a mix between Peltier and evaporative cooler is what you would end up with?
My history books give credit to the ancient Egyptians and Greeks for this, as they cooled their wine with it, by fanning the pots. So do James Burke, and Tim hunkin in their programs.
About 1940? My friends dad used a galvanised bucket of sand and half a gallon of petrol stick your beer bottles in away to go, Egypt - RAF . Not very green now!
Just had an idea. Imagine two terra cotta tubes with oasis between and a small fan to circulate the air from the inside tube into a room. I would think a u shaped set up to circulate the air from a room through not the outside air. Maybe a handy air conditioner.
Seems like the sort of thing that could be done if you have a bunch of room to make an oddball low-energy version of a split aircon. Use clay pipes with sand between as the heart of the device. Clear plastic (old pop bottles?) directing warm airflow from a solar can stack around the outer pipe. Direct cool air from the inner pipe into the room to be cooled. Use water from a couple of those 100L rainwater barrels and an aquarium pump. Might even mitigate the 'orrible humidity problem of using indoor evaporative coolers, by keeping the evaporation part outdoors. I know I've seen bundles-of-pipes experiments into aircon videos a long while ago. Dunno if it was this channel or Technology Connections. Gotta wonder how using the terracotta cooler principle would stack up against those.
@@technicalfool Tech Ingredients did something like this with a combo of PVC pipes, fans, moisture absorbing chemicals, and water. The problem with the terracotta cooler is size and weight of system you would need.
@@justinw1765 Oh for sure, it'd probably need some hefty amount of clay pipe. But from an energy-use perspective, if it can keep a nice size room cool *and* dry for a few watts coming from a single solar panel rather than a kilowatt dragged out of the wall, using water saved from roof run-off, it could easily be a winner.
If I remember correctly, an arrangement like this was described in the book "The Great Escape" by Paul Brickhill. So it's also useful in POW camps in central Europe...
It would be interresting to see what power you could get out of a thermoelectric transducer using this sun fridge for the cold part of it and just a black painted heat sink for the hot part.
I've done the reverse. Baked ½ of a large terracotta pot split lengthwise. Once it's oven hot wrap a substantially wet towel around it several times and it will slowly release the heat over a few hours. I know if there is any moisture inside the pot it will explode! Destroying the oven. So it is not without risk but I methodically dried the terracotta by slowly increasing its heat. (Cheep apartment in my younger years without adequate heating ) fond memories looking back.
But honestly Rob, I am reminded of one of your older videos of energy exchange where you pulled a light vacuum to decrease the boiling temp of water and then have a passive adsorptive material at the hot side to pull the liquid over there. These systems can be optimized to move greater amounts of energy, and more importantly, the cold side can be put into a well insulated box/container also increasing efficiency, because with the terracotta system, you have too much conductive and convective energy exchange with ambient temps and air. Since I assume you've read some of the literature on this, I assume you know that some countries like Egypt have built systems like this that create large amounts of ice (granted these systems are pretty large, and more involved than what you built/showed us). And they just use Solar heat as the regenerative part of transferring the liquid back. I think many of the systems use a combo of water and methanol as the liquid, but since it's in a closed system, no big deal. It's basically a less efficient overall, but more energy efficient and less expensive (and toxic) version of more modern cooling systems.
I agree mate - these systems can get better and more productive relatively easily but that does take a bit of construction - this is really aimed at super simple - of course - that means compromise - but see it as a way to think as opposed to an end solution if you like - cheers
Would more layers make it colder or just last longer? Or would it just disrupt the process? Could you use an insulated non porous lid on the inner pot? Sorry, I've always been told I ask too many questions. LOL
I just saw another video of using terracotta pots to filter your water. Plug the whole in the bottom of the pot fill it with dirty water and then put that pot inside of another container to collect the clean water after it seeps through. Apparently this is a medieval design. The new design is the Berkey filter which is really expensive and needs filters replaced every so often. Who new that there are so many good uses for terracotta. Thanks for the Video I am going to give this a try!
Awesome tip. Thanks :) i expect.. "I EXPECT" lol, that you'll help with using the terracotta pots as a heat source as per the film "I Daniel Blake"? which is a brilliant film even to this day. many will relate to it.
Law of thermodynamics ,heat will flow from a hot body to a cool body. In this scenario heat flows from a cool body to a hot body. On the surface it appears to contradict the law . The question is what is going on at the boundary and how is that causing heat to flow towards the hotter body of air .
What if we used evaporative cooling, swap coolers, to aid regular air conditioning, like if we were to collect the cold water from the condenser, and blow air over that water to help it evaporate, absorbing heat energy, which could be fed back into the room/condenser, making the output chillier more efficiently?
The more efficient ACs already use condenser water in exactly that fashion to cool the hot coils, blowing the spent vapour outside with the exhaust air. They tend to only collect water when you're running the machine in "dehumidify" mode.
I have no experience with peltiers so my question may sound dumb. Isn't it possible to stack some peltiers end on end so that the 5deg difference adds up? Yeah, besides energy consuption and latent heat. I am talking about improving the temp differential with more peltiers and more energy, but essentially the same peltier module, nothing fancy Thanks!
@@ThinkingandTinkering there is this, I believe, stupid idea that something may not work because if it did, someone would have already done it. I find it is, as a concept, a complete destroyer of ideas and innovation. This idea is dead simple, so maybe it is just one of those cases of "we did try already kiddo" Or maybe not :) I have no peltiers. My folks around don't throw away their cocacola minifridges. If you try yourself, I'll stay tuned :)
@@ThinkingandTinkering right back at cha.. Love your video's, love your ambition to Share simple science and Fact. Your a Hero type as far as, Educating Humanity.. Keep doing this work, of HERO'S. In my Eye's, any and every EDUCATOR that share's independantly Verifiable fact's, IS A hero. Awesome work you do!!!
The cooler you can keep the hot side of the peltier device, the cooler the cold side will get. In the off grid micro fridge/cooler that I'm designing, the hot side of the peltiers are connected to a copper plate version of those super thermally conducting heat tubes that are used on computers (the ones that under vacuum with a little water in same). And on top of that, to aid in the process, will be a damp microfiber cloth, which also will cool via evaporation. It's powered by a Solar panel during the day, so I'm not too concerned by efficiency/energy cost. At night time, it will be cooled by radiative cooling. Since the cooler itself will be insulated with vacuum panels* + some high quality natural insulation, it will be pretty efficient overall at keeping things cold. While I do like the terracotta system, it's not very efficient for my area because we consistently have high humidity (the somewhat south of the east coast of America). In the summer, we are lucky if it gets to 40% humidity, let alone below that--especially at the beach. It's also a pretty heavy system as is. Though I suppose one could use other lighter materials. *Originally I was trying to build the vacuum into the structure itself, but I realized that would be too difficult to do, especially for making multiple of these. You have to make the structure very strong in that case, and I'm trying to make it as light as possible, so that is a big challenge. It's technically possible, but it ups expense, complexity, and time of building. So I've decided on making my own vacuum insulated panels that can be inserted and then cushioned by natural insulation, which makes it so the structure doesn't have to be near as strong/rigid and tough.
I don't think this will work with plastic pots, because that's all that most people I know have on-hand, so you will need to go buy a set, some foam (which is also very useful for other things besides floral arrangements) and put it away somewhere. You could use the flower pots for heaters in the cooler days, while you store things outside in the cold, and as a refrigerator on the warm days, when you don't need the pots for heating. I would suggest you filter the water somehow, if it's dirty.
One question I am wondering about is; Would it work better if you stack those Peltier panels? (or will it just transport the same amount of heat energy no matter how many Peltier panels you add?)
Another brilliant video. Was reminded of a recent Business Insider piece How This Electricity-Free Fridge Saved An Indian Ceramics Factory | Big Business4.8M views · 6 months ago MittiCool Clay Refrigerator | Runs without electricity FYI
now put your peltier device inside your desert cooler to get 15 + 18 degree drop. I wonder if you could nest peltier devices to get any degree of cool.
Most dubious numbers ever given on peltier devices. The truth is that they will have a maximum thermal transfer capacity and that will always happen with a delta close to 0c. They will also have a maximum thermal delta, and that happens close to (practically at) 0 watts of thermal transfer. In other words, the less work there is to be done, the higher the thermal delta. Maximum delta is usually 60-72c so the cold side temp is mostly dependent on how well you can cool the hot side..
Sounds interesting. I wonder how much electricity it could generate. I've wondered about thermal generators for places where solar panels get too hot. I suspect they are not terribly efficient, but it is worth trying.
Would copy paper work better as a lid? Going to try it with pearlite :) Wonder if in areas of high humidity if you could surround the outer pot with a moisture absorbing substance like bamboo char or zeolite or kitty litter if that would help? Could packets lying around close do the trick or would a third pot cause some interesting results? Would the cooling effect work without the wind blowing about the second pot? Would the aborbsive substance be enough? I guess the real question is which is the better evaporator: Heat or the absorbsive stuff...
When moisture absorbing materials absorb moisture, some heat is generated, so unless that heat is insulated or piped away from the system, it will decrease overall efficiency some, even if you are getting more total evaporation. If you can do the former, seems like a great idea for more humid areas.
@@justinw1765 okay, so one more layer that wicks heat, which could be as simple as wind blowing against terra cotta as long as the reaction is hotter than the outside air? Or maybe something else. Heat just has to keep moving outwards. Starting to be a kind of Russian Doll problem, but with a definite end point in sight. Interesting
@@colleenforrest7936 Seems the simplest solution would be to have an intake fan at the bottom and and an outtake fan at the top? This will not only remove heat from the absorption process, but will speed up evaporation at the same time.
I think anything as long as it will evaporate moisture - it might be an idea to make it black. I like the idea of zeolite - but it does get hot as it absorbs water so the first step would be wet it - let It cool to ambient but sealed up so it can't dry the expose it to air and it should get impressively cold as it dries out
@@ThinkingandTinkering Just jumped from your recent zeolite video to this one, to see if you had thought this exact thing or tested such. I think you'll be unto something there.
Put Some Borax in there see if that makes it better or mixed The Borax with the sand I watch a documentary about something like that that's why I mentioned it
@@justinw1765 I'm not really sure but I think it's causes the temperature to drop and I'm not sure the measurement of it either but somebody put it in a box with sand or something like that I wish I could tell you more but they built a space suit and walked across the desert in 110° or something and said they stayed cool so I guess you'll just have to experiment I think it's borax sand and water inside a styrofoam cooler and they put a dryer hose to the homemade space suit I hope that helps it was a long time ago so anyway I hope that helps
@@denisstump5874 Hmm, maybe it acts like xylitol then? When xylitol is exposed to evaporating water, it undergoes some kind of chemical change and drops in temperature, besides the drop in temp from the evaporation of the water itself. Some brands have bonded xylitol to clothing fibers to get an extra cooling effect based on these principles.
Huh. so if you black the outside of your teracotta, and make a printer paper and plastic lid for the top, I'll bet that would improve efficiency further.
The whole rest of the world uses centigrade and metric. I like metric for everything but temps, because imperial system has finer grade of measurement. I mean, you can say things like, 24.5* C, but it's just easier to say/understand 76* F. Or another way to say it, there are more whole degrees per degree F, as compared to 1 degree of C.
@@justinw1765 Astounding. I really don't see the appeal. My preference is Fahrenheit, for the reason you stated. Is it true that the Celsius scale has 0C boiling and -100C freezing, yet the Centigrade system uses the unit of Celsius? Brexit.
@@1mremington 0* C= freezing and 100*C= boiling. Both systems become the same at -40. Centigrade and Celsius are different words for the same thing/system.
@@justinw1765 Funny. That is what I thought also. That may not have always been the case. It is claimed by some that Jean-Pierre Christin took Anders Celsius' scale and reversed the boiling point and freezing point to create the Centigrade scale.
If 10 MILLION viewers per day, who use fahrenheit, watch videos or read articles using centigrade, that is 10 MILLION people calculating C to F. If the 1000 or so content creators calculated it for us, it would be 1000 people calculating instead of 10 MILLION calculating.
Remind me of the time that I was shown a simple heat exchanger...soak a towel and cover your beers with it .. as the sun evaporated the water..the beers got cooler..
@@neilboat3963 Yeah, the water phase change and energy transfer capacity is quite amazing. Can move a lot of energy. I'm assuming they used a dark towel?
Have you listened to this video, is it me or your voice going from loud to soft so often that it’s hard to listen to?, how about a mike clipped to your shirt?.
This is like building a portable cellar. Except instead of the natural condensation in a cellar, you have to add water occasionally. Awesome rediscovered tech. This is my new favorite channel.
We’ve used this in African huts for years. I remember the pot-bellied pots my grandparents used in the 70’s when I lived in East Africa.
it is an awesome thing
Remember and collect as much information from the elders as you can we are entering a time when we will need it👍
@@seamuscharles9028 If we started using it now, we might avoid all that nonsense.
Nice! Use aluminum for the interior pot and it will get colder. Put black sand on top and evap will increase as will cooling. 😎 Throw in a slight fan will increase evap as well. High humidity will decrease evap thus decrease cooling so it works best in low humidity.
It won't get maximally colder with the Al pot, but it will transfer the energy exchange faster/more efficiently. Since the system isn't well insulated from ambient temps, doesn't matter too much, because you constantly have warm air getting back into the system, which will equalize the temp of the Al pot.
Basically, there will be no difference of total energy exchange, just different rates of relative cooling and heating and time of same.
nice suggestion - cheers mate
So cool! I can't believe it is so effective and yet so simple and things this clever and useful aren't taught enough! Thanks Rob, great video!
Zebras also have stripes because they heat up differently and create eddies and currents of air around their bodies, cooling them by up to 3 degrees Celsius. Something similar could be done inside the pot fridge, on the wall of the house, or the cooled room behind the stove - different materials, colors that have different thermal conductivity and different shapes that direct and distribute the currents.
Again a blindingly informative video. The temperature differences achived depending on the outside temp a nice curve ball to the quoted stats of insulation companies. Love it. Please keep doing what your doing as i throughly enjoy your uploads
thank you mate
You could NOT possibly know how much your videos mean to me ‼️‼️‼️❣️❣️❣️❣️
You teach me GREAT living skills and Scotty teaches me how to care for my vehicle MYSELF 🥳
I'm a 73yr. old lady and pretty much by myself....
THANK YOU ❣️❣️❣️❣️❣️
I used to use a zeer pot in my camper (caravan?) If I remember correctly Mother Earth News said to soak the outer pot and keep it damp to aid in evaporation. Once its operating the outer pot stays slightly damp. they do a decent job and you dont need to worry about ice but like you said they arent as effective in humid areas. You can help them by blowing air around them..
cheers mate
I love that almost every video starts with "Hi so"
Very little youtubers greet you in their video's.
I didn't even notice I did that until you mentioned it - awesome - cheers mate
Traditionally in India that's how people used to cool water, many people still use it today, It's called a 'Matka'. It's a porous clay pot, made of black soil. Street hawkers also use it to keep 'Kulfi' , which is an Indian ice cream, cool and prevent it from melting.
nice - cheers mate and the black makes more sense than red
Awesome upload! Thank you very much Robert!!
These things are going to be fantastic for putting on the window sill.... And I will have to tell my Dad who's living in Spain!!
oh - he will love it!
Hello. I am thinking to marry this two! Peltier on the bottom of pots. A battery and some generator/charging device.
nice!!
I would like my house built on this principle. Very interesting and absolutely amazing!
Hi again bob it’s another greet task for me to try and repeat your greatness. Absolutely love ur videos ❤
When I do archery in the field, I usually take a bottle of beer with me. To keep it cool I wrap a wet microfiber cloth around it and secure the cloth with a rubber band or two. After shooting for 2 to 4 hours my beer will still be quite cold! Boom!
When I go camping I always have one or two microfiber towels (the ones you use for drying the dishes) with me. They're so handy.
I'm curious if hemp cement pots would work better and last longer than Terra Cotta? Hemp Cement or Isochanvre basically calciumates and fossilized over time making it last for thousands of years. Homes are now being built again with this hemp cement mixture which keeps the internal temperature comfortable throughout the year.
Recently I changed my path and decking at the back of my house for black block pavers, I know this is going to sound strange but in the summer all I had to do is spray them with a hose and they cooled the garden and now i's got a bit cooler they are heating it. The effect is quite noticeable because they act like a sponge to water and a fantastic heatsink (when dry).
Thank-you very interesting. It reminds me of my grandma she had a terracotta bottle cover for the milk. She put the milk bottle in a bowl of water then the cover on top. I don't remember ever having milk that had gone off.
Fill the center with wet Oasis and put it in front of a window with a cross breeze and you have a handy air cooler for your window for those summer days where the heat is not on your side.
nice one!
I used to live in a house made of wood, straw, and clay with no air conditioner, and it stayed cool entire summer. Not sure why they don't use this technology anymore...
I'm So wanting a Cob House!!
They're a bit labour intensive to build,but well worth the effort!!
Thank You for sharing this with us All 💞 Namaste 🙏
Andrea and Critters. ..XxX...
I used to live in one wood straw clay building from 1860. It was always cool in the summer with just the right amount of humidity inside.
On our new farm we hve brick walls and added woodfiber plates and clay to all walls facing outwards. Oh and we integrated heating/cooling loops that are hooked up to a heatpump running at35°c. The whole wall can breathe and it was just as easy to build as modern building materials. Clay is quite forgiving and can be locally sourced and using wood fibre panels makes it super easy to install. Waaaay better than rock wool. All this to say at least in germany it's possible and still done.
to be honest - I think a lot of heating and cooling problems just come down to the way we build out houses
@@ThinkingandTinkering or dont build em.
I dare say the PC brigade (sharp intake of breath) will see it as a fire hazard.
That’s a good one. I was fan of evaporative cooling for housing as it’s very dry here in some parts of Australia but I discovered that it can be too dry and hot which means you use more water than you can afford to loose which is why people in those areas actually prefer conventional refrigerative type A/C.
Something that I once wanted to try for cooling items was to have a very well insulated tube/tower with an access door at the bottom and a parabolic dish on top as large as possible with hole in it to collect cool air as you know cool air is heavy. Of course it would also collect water unless you had a drain with a floating ball valve at the bottom that will not allow the cold air to drain out.
I have no idea if it would work well or not but if you think it’s a worthy experiment then I’d love to see you try it out.
At Uni, we could never get a peltier plate to cool down to 0C. We just use it to power a small fan and evaporate some liquid.
Love to see what improvements you can come up with based on this old tech. Maybe a outer cabinet with a fan to draw air past and increase its cooling capacity... This kind of old school tech can really change people's lives with the increasing cost of living for those still on the grid.
I agree and I like the suggestion you made there mate - I guess we could increase the evaporation rate and so the cooling effect by something as simple as making the outside black
@@ThinkingandTinkering I did experiment with a black outside using BBQ paint, as it still allowed the moisture escape. I was planning to then use Solar reflectors, akin to solar cookers, to intensely heat the pot to measure if it increased the inner cooling.
Hi Rob made one of these a few years ago, no idea why I didn't think of this the other day when I was trying to keep my beers cold on the beach
Y’all deserve some kind of award for what you did at 2:01
cheers mate
many years (about 1970) ago I made a ccd camera for astronomy where a peltier device was used to provide a low temperature to reduce ccd noise and the first time I heard of one.
Similar effect, I've been doing some serious labouring/building work in this recent heat, in a sun-trap/beer-garden, people are fainting in the heat while doing nothing. All I'm doing is running my cotton T-shirt under the tap, wringing it out, wearing it. Sorted. Personal 'air-conditioning'. It last between 30-40 minutes before I need to recharge it, but I can labour all day in comfort.
Bill and Ben lived in a plant pot and they were super cool 🤣 oo flopadop little weeeeed 🌻
Mate this is quality. I bought a cool box with a peltier in it and the cooling was horrendous. They said it would keep all of the food cold.
The food was always hot, it never called properly and the condensation inside was terrible!
I could do with a new fridge made out of a plant pot. Going to carry on watching now ;)
This principal is not new, when I grew up in the 60's we had a clay pot made by the black peoples in South Africa and fired in an open fire to hold it's porosity. That pot kept all our drinking water nice and cool all through the day by the evaporation of it's contents. The blacks have employed this principal for many, many years to keep their drinks cool and it works a treat. It was a very nice video in any way please keep them coming.
When the temperature drops below 30 degrees Celsius - you can light the rocket heater you made with sand and place pot fridges around the heater. This will ensure a sufficient temperature gradient. 🙂It is an exaggeration and at the same time it is not.
it is an interesting idea mate - nice - cheers
@@ThinkingandTinkering Or place the stove against the wall, make the whole wall or part of it as a double wall of pot fridge and one room would be heated and the other room cooled. Something like this.🙂
So humans are just desert coolers?! Crazy! We run on this same principle for sweat evaporation. So nifty.
Absolute Gold this kind of info is. Thanks for sharing mate :)
So, can it be scaled to be around the house? Or at least make something that circulates air in it, or maybe a coolant, to create some sort of air condition unit from it?
There are what was called swamp coolers around for along time and for awhile now, I've been seeing ads for small units. They uaually start by saying something like "cool any room in 5 minites". Of course you can start cooling, but not cool said room in 5 min. and if your adding humiid air, it will prob feel worse over time unless your in a dry area. They are used alot in green houses were hunidity isn't a problem.
@@putteslaintxtbks5166 Yeah, if you were in a more humid area, you would want to put the evaporation unit outside, increase evaporation somehow (solar panels+fans?), and rather than directly blow the cooler, but humid air in, you would want to cool some kind of contained solid or liquid cooling exchange instead, so that you're not adding to the overall humidity.
Most swamp coolers directly blow the cooler, but damper air inside, which is fine if you live in a very dry climate--actually can make things more tolerable if its desert like. But even in the desert, these things can get real nasty pretty quick as far as microbial growth.
I would think so mate - might need a bit of reworking in terms of heat transfer - but the basic idea sounds good to me
Sliding your beers into wet socks and hanging them from the car mirror will chill beers in 20 to 30 minutes. Dont drink and drive!
A good breeze works well too.
Wouldn't the peltier elements complement these since it's creating a temperature differential? Could even use a thermoelectric generator
Try a white styrofoam lead for the inner pot and set it in the sun with longer strips of Oasis hanging over the sides shading out the outer pot The Oasis gets hotter and increases the evaporation process but both parts stay cool I got to try that
Decades ago the magazine 'ScientificAmerican' had an artical about a multi-layer 'Peltier' device that could get down to
-40C (and better). It might be worth another look. Sorry I don't have more details, yet. I'll do a bit of digging.
What I'd like to see is some of these things mixed together. Maybe have several devices working together, the paint cooler, the plant pot cooler and the TEC if you can get it to run off sun or off your burner.
that's amazing, using that principle would make a great small house project, in desert/hot areas. just supply water between the inner and outer walls to keep the interior cool without expensive air con.
The problem with doing that in the desert is, deserts are notoriously short of water. In fact, it's generally included in the definition.
I think you are right mate
I think he is thinking of places like Nevada, Arizona, Utah - in a hose there I would expect piped water - wouldn't you?
@@ThinkingandTinkering I live in Las Vegas, Nevada. The water level in Lake Mead, a major source of water in this part of Nevada, is at a historic low, with no signs of improvement. The reservoir is now below 30% of capacity.
Restaurants only provide glasses of water at the table upon request, and the Valley Water District has recently raised the fines for wasting water. Fines range from $80-$5,120, depending on the amount of waste and the number of violations.
In other words, Nevada, Arizona, and other states in the this part of the US are in a condition of drought, and while a more energy-efficient cooling system would be nice, increasing water use is probably not the best idea.
I wonder about changing the containers a bit so that air can be passed through the inside container, blowing cooled air.
You could use coco coir (£15 for 75 litres on Amazon) for the water reservoir.
Leather works too ☝️🤟👽
nice - thanks for that mate
I sort of knew about these things before but I had no idea they were so effective. Why do we not use this technique for cooling houses in hot climates?
We do, in a few ways. People use swamp coolers in small scale, and many large buildings have cooling towers that use a flowing water system.
they do mate - but it is still underused as not a lot of folks know about them and not that many want to change
@@ThinkingandTinkering A shame. I live in Sydney Australia, and it often gets to be over 30C here sometimes over 40. Even a few degrees would help. Maybe it's too humid for this to work.
Awesome! 👏
cheers mate
I have seen a video of a company in India that makes square terracotta 'fridges', evidently it uses the same principles you are talking about. Evidently they are very effective and most popular in rural India where there is no power. Great presentation.
P.S. they described using this principle in the P.O.W. camps in WW II using wooden boxing from food packages and hessian cloth.
I took a coolbox and installed 3 40x40 fans, 2 peltiers and 4 mini heatsinks, used a female usb-c and made a mini fridge for 20$ that i can connect to a fast charger or my 40w solar panel.
Apologies if I didn't get the mechanism right but, couldn't you just replace the inner pot with a metal/glass one?
Back in the 60's when we were poor and had no fridge we used to use the kitchen sink!
We would put the milk in there (remember glass bottles with the great thermal conductivity?) Simply chuck a tea towel over and run a few inches (yes we were in inches back then too) of cold water in and Bingo! you had your free cooler.
OK Peltier time ....... You say that you can get 15 degrees cooler on the inside compared to the hot side, but that is relative! Cool the hot side and you cool the inside even more. Your oasis should work well clamped against the hot side and with the base in water! Or you could put several plates face to face (hot to cold obviously) you would then multiply the heat difference!
you would - but only so far as you kept the hot side cooler and a Peltier transfers heat so the hot side would gradually get hotter unless you actively did something to keep it cool - so maybe a mix between Peltier and evaporative cooler is what you would end up with?
@@ThinkingandTinkering Yes! That is what I ment with the oasis. Cool the hot side and the cold side gets even cooler!
My history books give credit to the ancient Egyptians and Greeks for this, as they cooled their wine with it, by fanning the pots. So do James Burke, and Tim hunkin in their programs.
About 1940? My friends dad used a galvanised bucket of sand and half a gallon of petrol stick your beer bottles in away to go, Egypt - RAF . Not very green now!
When we were blasting we would put the nitropril in a bucket
of water to cool our beer, cooled it to a drinkable level!
I think If I suggested that the video would be removed by youtube lol
Just had an idea. Imagine two terra cotta tubes with oasis between and a small fan to circulate the air from the inside tube into a room. I would think a u shaped set up to circulate the air from a room through not the outside air. Maybe a handy air conditioner.
The opposite to the convection heater made out of stacked painted black cans
Seems like the sort of thing that could be done if you have a bunch of room to make an oddball low-energy version of a split aircon. Use clay pipes with sand between as the heart of the device. Clear plastic (old pop bottles?) directing warm airflow from a solar can stack around the outer pipe. Direct cool air from the inner pipe into the room to be cooled. Use water from a couple of those 100L rainwater barrels and an aquarium pump. Might even mitigate the 'orrible humidity problem of using indoor evaporative coolers, by keeping the evaporation part outdoors.
I know I've seen bundles-of-pipes experiments into aircon videos a long while ago. Dunno if it was this channel or Technology Connections. Gotta wonder how using the terracotta cooler principle would stack up against those.
@@technicalfool Thank you for sharing this information!! Much appreciated!!
@@technicalfool Tech Ingredients did something like this with a combo of PVC pipes, fans, moisture absorbing chemicals, and water.
The problem with the terracotta cooler is size and weight of system you would need.
@@justinw1765 Oh for sure, it'd probably need some hefty amount of clay pipe. But from an energy-use perspective, if it can keep a nice size room cool *and* dry for a few watts coming from a single solar panel rather than a kilowatt dragged out of the wall, using water saved from roof run-off, it could easily be a winner.
If I remember correctly, an arrangement like this was described in the book "The Great Escape" by Paul Brickhill. So it's also useful in POW camps in central Europe...
really? - awesome - that I didn't know - thanks for sharing mate
It would be interresting to see what power you could get out of a thermoelectric transducer using this sun fridge for the cold part of it and just a black painted heat sink for the hot part.
that is an interesting idea - nice one mate and thanks for the thought
Awesome, stay cool good sirs. Have a wonderful day
you too mate and cheers
I've done the reverse. Baked ½ of a large terracotta pot split lengthwise. Once it's oven hot wrap a substantially wet towel around it several times and it will slowly release the heat over a few hours. I know if there is any moisture inside the pot it will explode! Destroying the oven. So it is not without risk but I methodically dried the terracotta by slowly increasing its heat. (Cheep apartment in my younger years without adequate heating ) fond memories looking back.
like it mate - that is a nice tip
But honestly Rob, I am reminded of one of your older videos of energy exchange where you pulled a light vacuum to decrease the boiling temp of water and then have a passive adsorptive material at the hot side to pull the liquid over there. These systems can be optimized to move greater amounts of energy, and more importantly, the cold side can be put into a well insulated box/container also increasing efficiency, because with the terracotta system, you have too much conductive and convective energy exchange with ambient temps and air.
Since I assume you've read some of the literature on this, I assume you know that some countries like Egypt have built systems like this that create large amounts of ice (granted these systems are pretty large, and more involved than what you built/showed us). And they just use Solar heat as the regenerative part of transferring the liquid back. I think many of the systems use a combo of water and methanol as the liquid, but since it's in a closed system, no big deal.
It's basically a less efficient overall, but more energy efficient and less expensive (and toxic) version of more modern cooling systems.
I agree mate - these systems can get better and more productive relatively easily but that does take a bit of construction - this is really aimed at super simple - of course - that means compromise - but see it as a way to think as opposed to an end solution if you like - cheers
Would more layers make it colder or just last longer? Or would it just disrupt the process? Could you use an insulated non porous lid on the inner pot? Sorry, I've always been told I ask too many questions. LOL
Microsoft Data Centres use evaporative cooling. Really large scale impressive use of the principles
I didn't know that - fascinating - thanks for sharing
I just saw another video of using terracotta pots to filter your water. Plug the whole in the bottom of the pot fill it with dirty water and then put that pot inside of another container to collect the clean water after it seeps through. Apparently this is a medieval design. The new design is the Berkey filter which is really expensive and needs filters replaced every so often. Who new that there are so many good uses for terracotta. Thanks for the Video I am going to give this a try!
I’d test that water. The Terra cotta can hold minerals you don’t want to imbibe.
go for it mate - and make a video!! - depending on the water you use - you might want to add a sterilisation process too
If rivers didn't have ripples you could paint peltier slabs black,pop them on a river an generate electricity without the need for moving parts
Awesome tip. Thanks :) i expect.. "I EXPECT" lol, that you'll help with using the terracotta pots as a heat source as per the film "I Daniel Blake"? which is a brilliant film even to this day. many will relate to it.
you think you are right - especially at this time
@@ThinkingandTinkering one of my 'most favouritest' quotes :) 😀😁
It would be great if it is possible to collect water by cooling air and creating dew.
I wonder if any passive systems are up for the task.
Great idea ‼️going to have a think on this as getting water from the air I'm SUPER interested in.
Law of thermodynamics ,heat will flow from a hot body to a cool body. In this scenario heat flows from a cool body to a hot body. On the surface it appears to contradict the law . The question is what is going on at the boundary and how is that causing heat to flow towards the hotter body of air .
What if we used evaporative cooling, swap coolers, to aid regular air conditioning, like if we were to collect the cold water from the condenser, and blow air over that water to help it evaporate, absorbing heat energy, which could be fed back into the room/condenser, making the output chillier more efficiently?
The more efficient ACs already use condenser water in exactly that fashion to cool the hot coils, blowing the spent vapour outside with the exhaust air. They tend to only collect water when you're running the machine in "dehumidify" mode.
great idea mate
I have no experience with peltiers so my question may sound dumb.
Isn't it possible to stack some peltiers end on end so that the 5deg difference adds up?
Yeah, besides energy consuption and latent heat. I am talking about improving the temp differential with more peltiers and more energy, but essentially the same peltier module, nothing fancy
Thanks!
I don't really know tbh - but it sounds possible - the energy consumption would shoot up obviously
@@ThinkingandTinkering there is this, I believe, stupid idea that something may not work because if it did, someone would have already done it. I find it is, as a concept, a complete destroyer of ideas and innovation.
This idea is dead simple, so maybe it is just one of those cases of "we did try already kiddo"
Or maybe not :)
I have no peltiers. My folks around don't throw away their cocacola minifridges.
If you try yourself, I'll stay tuned :)
I want to build a huge one and sit in it lol
Champion of Brain's..Doing Great work!
cheers mate
@@ThinkingandTinkering right back at cha.. Love your video's, love your ambition to Share simple science and Fact. Your a Hero type as far as, Educating Humanity..
Keep doing this work, of HERO'S.
In my Eye's, any and every EDUCATOR that share's independantly Verifiable fact's, IS A hero. Awesome work you do!!!
The cooler you can keep the hot side of the peltier device, the cooler the cold side will get. In the off grid micro fridge/cooler that I'm designing, the hot side of the peltiers are connected to a copper plate version of those super thermally conducting heat tubes that are used on computers (the ones that under vacuum with a little water in same). And on top of that, to aid in the process, will be a damp microfiber cloth, which also will cool via evaporation.
It's powered by a Solar panel during the day, so I'm not too concerned by efficiency/energy cost. At night time, it will be cooled by radiative cooling. Since the cooler itself will be insulated with vacuum panels* + some high quality natural insulation, it will be pretty efficient overall at keeping things cold.
While I do like the terracotta system, it's not very efficient for my area because we consistently have high humidity (the somewhat south of the east coast of America). In the summer, we are lucky if it gets to 40% humidity, let alone below that--especially at the beach. It's also a pretty heavy system as is. Though I suppose one could use other lighter materials.
*Originally I was trying to build the vacuum into the structure itself, but I realized that would be too difficult to do, especially for making multiple of these. You have to make the structure very strong in that case, and I'm trying to make it as light as possible, so that is a big challenge. It's technically possible, but it ups expense, complexity, and time of building. So I've decided on making my own vacuum insulated panels that can be inserted and then cushioned by natural insulation, which makes it so the structure doesn't have to be near as strong/rigid and tough.
yes - they are all about temperature difference rather than absolute temperature and humidity has it's own challenges for sure
I don't think this will work with plastic pots, because that's all that most people I know have on-hand, so you will need to go buy a set, some foam (which is also very useful for other things besides floral arrangements) and put it away somewhere.
You could use the flower pots for heaters in the cooler days, while you store things outside in the cold, and as a refrigerator on the warm days, when you don't need the pots for heating.
I would suggest you filter the water somehow, if it's dirty.
so awsome channel
wow - cheers mate
Those mini fridges cost around £60 quid a year to run......not green.
no they aren't - personally I consider them to be junk
Can these pots be joined together for more cooling power
How big can you make it ? Will scaling it up worsen the performance ?
Most houses in India have a pot like this in summer
Btw trees can raise water as big as a redwood
for sure
Sucking up is easy, at the top instead of leaves , vibrate the top, moisture collector, pool, gravity, turbine turn
have you tried it? I suspect in practice it is not as easy as it seems
One question I am wondering about is; Would it work better if you stack those Peltier panels? (or will it just transport the same amount of heat energy no matter how many Peltier panels you add?)
Peltier devices CAN be stacked to achieve higher differences. Now, to what extent - I don't know. Try it out! They're really cheap on Amazon.
Another potty experiment‼️
No wonder your channel is growing in popularity 🤗
What if you used it for your sterling engine ?
oh yes - lol
Another brilliant video. Was reminded of a recent Business Insider piece
How This Electricity-Free Fridge Saved An Indian Ceramics Factory | Big Business4.8M views · 6 months ago
MittiCool Clay Refrigerator | Runs without electricity
FYI
now put your peltier device inside your desert cooler to get 15 + 18 degree drop. I wonder if you could nest peltier devices to get any degree of cool.
I wonder
Most dubious numbers ever given on peltier devices.
The truth is that they will have a maximum thermal transfer capacity and that will always happen with a delta close to 0c.
They will also have a maximum thermal delta, and that happens close to (practically at) 0 watts of thermal transfer.
In other words, the less work there is to be done, the higher the thermal delta. Maximum delta is usually 60-72c so the cold side temp is mostly dependent on how well you can cool the hot side..
cheers mate
Awesome
cheers mate
Can you run a stirling engine with that temperature difference?
most terracotta pots have a hole in the bottom, so one in the other won't keep the water in/out until you plug those holes.
👀 anything not held with capillary action in the sand or soil will drain out the bottom of the big pot
true enough - thanks mate for taking the time to suggest that - I basically forgot to mention it
Could you turn this into a Thermal energy generator by keeping one side of a peltier TEG cool in the pot and the other side in the sunshine?
Sounds interesting. I wonder how much electricity it could generate. I've wondered about thermal generators for places where solar panels get too hot. I suspect they are not terribly efficient, but it is worth trying.
absolutely mate
Would copy paper work better as a lid?
Going to try it with pearlite :)
Wonder if in areas of high humidity if you could surround the outer pot with a moisture absorbing substance like bamboo char or zeolite or kitty litter if that would help? Could packets lying around close do the trick or would a third pot cause some interesting results? Would the cooling effect work without the wind blowing about the second pot? Would the aborbsive substance be enough?
I guess the real question is which is the better evaporator: Heat or the absorbsive stuff...
When moisture absorbing materials absorb moisture, some heat is generated, so unless that heat is insulated or piped away from the system, it will decrease overall efficiency some, even if you are getting more total evaporation. If you can do the former, seems like a great idea for more humid areas.
@@justinw1765 okay, so one more layer that wicks heat, which could be as simple as wind blowing against terra cotta as long as the reaction is hotter than the outside air? Or maybe something else. Heat just has to keep moving outwards. Starting to be a kind of Russian Doll problem, but with a definite end point in sight. Interesting
@@colleenforrest7936 Seems the simplest solution would be to have an intake fan at the bottom and and an outtake fan at the top? This will not only remove heat from the absorption process, but will speed up evaporation at the same time.
I think anything as long as it will evaporate moisture - it might be an idea to make it black. I like the idea of zeolite - but it does get hot as it absorbs water so the first step would be wet it - let It cool to ambient but sealed up so it can't dry the expose it to air and it should get impressively cold as it dries out
@@ThinkingandTinkering Just jumped from your recent zeolite video to this one, to see if you had thought this exact thing or tested such. I think you'll be unto something there.
I could tolerate my Cola-Colas at 5C, or bretter yet, a Guinness.
Put Some Borax in there see if that makes it better or mixed The Borax with the sand I watch a documentary about something like that that's why I mentioned it
What does the borax do?
@@justinw1765 I'm not really sure but I think it's causes the temperature to drop and I'm not sure the measurement of it either but somebody put it in a box with sand or something like that I wish I could tell you more but they built a space suit and walked across the desert in 110° or something and said they stayed cool so I guess you'll just have to experiment I think it's borax sand and water inside a styrofoam cooler and they put a dryer hose to the homemade space suit I hope that helps it was a long time ago so anyway I hope that helps
@@denisstump5874 Hmm, maybe it acts like xylitol then? When xylitol is exposed to evaporating water, it undergoes some kind of chemical change and drops in temperature, besides the drop in temp from the evaporation of the water itself.
Some brands have bonded xylitol to clothing fibers to get an extra cooling effect based on these principles.
interesting suggestion - cheers mate
Hello I can use this in house??
Huh. so if you black the outside of your teracotta, and make a printer paper and plastic lid for the top, I'll bet that would improve efficiency further.
yes I bet it would
Neat pot! Figures in Fahrenheit would be more informative to me, even though I do know the conversion. Do the English really use Centigrade?
The whole rest of the world uses centigrade and metric. I like metric for everything but temps, because imperial system has finer grade of measurement. I mean, you can say things like, 24.5* C, but it's just easier to say/understand 76* F. Or another way to say it, there are more whole degrees per degree F, as compared to 1 degree of C.
@@justinw1765 Astounding. I really don't see the appeal. My preference is Fahrenheit, for the reason you stated. Is it true that the Celsius scale has 0C boiling and -100C freezing, yet the Centigrade system uses the unit of Celsius? Brexit.
@@1mremington 0* C= freezing and 100*C= boiling. Both systems become the same at -40.
Centigrade and Celsius are different words for the same thing/system.
@@justinw1765 Funny. That is what I thought also. That may not have always been the case. It is claimed by some that Jean-Pierre Christin took Anders Celsius' scale and reversed the boiling point and freezing point to create the Centigrade scale.
@@1mremington Could be, am not sure one way or the other.
your sound is very low rob my lap top turned all the way up still cant make it out love your videos thanks for making them
I will try and improve that - it is on my mind and I am sure a pain to listen to - thanks for the heads up
I thought you could stack peltier's
Why a damp cloth on top
Why not a solid lid/cover
Yeah, seems you would want to insulate the top. I guess this is just to add more evaporative cooling, as cool tends to sink and hot tends to rise?
it adds to the cooling effect - I suspect an unglazed lid would work just as well
If 10 MILLION viewers per day, who use fahrenheit, watch videos or read articles using centigrade, that is 10 MILLION people calculating C to F. If the 1000 or so content creators calculated it for us, it would be 1000 people calculating instead of 10 MILLION calculating.
My mind says throw a sterling engine on top
that is a good idea!!
perlite
Remind me of the time that I was shown a simple heat exchanger...soak a towel and cover your beers with it .. as the sun evaporated the water..the beers got cooler..
@@neilboat3963 Yeah, the water phase change and energy transfer capacity is quite amazing. Can move a lot of energy. I'm assuming they used a dark towel?
zeolite
ᑭᖇOᗰOᔕᗰ
Have you listened to this video, is it me or your voice going from loud to soft so often that it’s hard to listen to?, how about a mike clipped to your shirt?.
yeah there is a sound issue - I will try and correct it