What I don't get is when people say that the round trip efficiency of Sand is low compared to Li Batteries. My take is WHO CARES?! If you lose 30%-50% of generated renewable power storing it in Sand that's STILL 50%-70% power you would otherwise have lost because you don't have storage. And if Sand is MUCH cheaper than Li batteries and not subject to the scalability issues of batteries then it's better than nothing.

@ipp_tutor

23 күн бұрын

I get your point and it does have merit. But by the same logic, the efficiency of the renewable power source wouldn't matter either. Looking at it in reverse, a lower round-trip efficiency means lost power that you wouldn't lose if you used a Li-ion battery, improving your energy independence.

@jonjohns8145

23 күн бұрын

@@ipp_tutor Yes, but With Sand batteries you don't have to Ramp up production on Li, Cobalt, Manganese, and every other substance we would need to electrify everything and keep pumping out Batteries. The cost of mining, transport, pollution, discard, recycle of any Chemical battery (even if we switch the Na instead of Li) will Always be more than building a Big insulated tank and filling it with sand.

@keshermedia

23 күн бұрын

Better than nothing is often the wrong way to go. Also t here are far superior media than sand, and quite inexpensive as well.

@RP-hn1qc

23 күн бұрын

​@@jonjohns8145Why not just convert excess supply into hydrogen injected into existing natural gas system with a capped limit where safety wouldn't be an issue.

@markthomasson5077

23 күн бұрын

Exactly

Let's call them "thermal batteries", so people won't think they compete with electrical batteries.

14:00 pro tip. you don't have to just go up LOL you can also go down with it! 10 stories underground 3 stories above ground AND less wall support issues and collapse problems. so the acerage is way less than shown here by a huge amount! also you build a 50 storey building they go down like 20 stories in the basement to anchor it etc. well you can build your sand silo and bury it right next to the foundation and heat it from there forever. run electric in heat and hot water comes out

@SeeNickView

23 күн бұрын

This also solves the spillage issue, and doesn't have the potential to poison local soils because the stuff is solid. Although, you have to wonder what benefits sand has over local earth given that you don't need to excavate anything to do traditional, residential geothermal storage.

@junkerzn7312

22 күн бұрын

Water ingress is a huge issue for below-ground-level structures, so it really isn't as straight-forward as one might think.

@dmitryplatonov

14 күн бұрын

Going up is cheaper than going down.

That heat could be used for saunas even in the summer, or heating swimming pools.

@traybern

3 күн бұрын

Even in the SUMMER?? Ok, DUMBBELL.

Passive buildings sometimes use thermal mass such as winter sun hitting walls or floors of which cement to heat up during the day and release that heat at night. This works at residental scale

@markhathaway9456

4 күн бұрын

That can be a medium for storing heat in a system with a heat pump. Whether something natural like stone would be best for a cold storage isn't known to me, but natural safe materials at temperatures which don't explode, even when water is applied, would be great.

I think DIYers will build sand batteries. You could probably build some rudimentry heating system using nothing but reclaimed bits and pieces and some tinkering

@junkerzn7312

22 күн бұрын

People do but it is harder than it looks. One can use a water-heater's thermal element (electric backup element) for heating it up, but getting the heat out of the sand battery is actually not entirely trivial. Basically you need something that can tolerate the heat and you need airflow to get the heat out again. An open-ended steel pipe with a fan on one end to push air through, and then some fins (like a piece of a radiator) to disperse the heat in the air because you don't want a blast of hot air at 500C. Regulating the output is the hard part. You can't just duct it to the house (not at 500C). One mistake and the whole house burns down.

@Zeero3846

21 күн бұрын

On most videos you'll see on the subject, there's usually a lot of physical effort involved, and it doesn't really last past half a day. They work, but there's a human in the loop, and it's not a small part. An electrically-heated sand battery might require less effort, but there's usually not a reason to do that unless the electricity isn't coming from the grid, otherwise, you might as well turn on your normal electric heater. So far, I haven't seen anyone do anything beyond a proof of concept or proof that it works for the room they intend to heat. Also, almost none of them do any sort of heat regulation, but that's usually because they're trying to heat a large room as quickly as possible. I've never seen one try to do a hot water system.

You mentioned a "cold battery". Check out Ice Bear by Thule Energy Storage. This is daily thermal energy storage (DTES). Before refrigeration was invented people would harvest winter time ice from a lake and store it in an "ice house" so they would have ice in the summer time. This is seasonal thermal energy storage (STES). For winter home heat I use PV-direct to heat water in an uninsulated tank when the sun shines that at night heats the house (DTES). I am still trying do decide between sand or water or other for (STES). Thank you for a most informative video.

@wombatillo

22 күн бұрын

Cold batteries are already in use. There is one under Helsinki, a huge pool of cold water, and it's a part of a pretty extensive district cooling system. They have also district heating but the cooling system is also quite widespread and has been there for 20 years.

@Nurk0m0rath

20 күн бұрын

I've also seen an old ice house design from somewhere in the middle east, where they can't just store the ice. It used the expansion of air descending through a chimney into a larger chamber to make ice. My father used to work at a historic cliff dwelling in New Mexico where that mechanism occurred naturally, keeping the caves at about 65 F even when the temp outside was in the hundreds.

@qkktech

18 күн бұрын

Actually yoy can get cold from heat since fridge works on heating and gasifing things.

@markhathaway9456

4 күн бұрын

@@Nurk0m0rath For the cooling chimney, what's the process which does the cooling and is that cooler air just becoming the ambient air for their living area? It's not stored anywhere of course.

It's good that you mentioned the Northern parts, like Canada or Northern Europe, that's where it can be most useful. I too do not see the use of it much outside the district heating of places in colder climates, because in the Northern places you mentioned we will not get much sun from mid October - start of March, so all we have left of renewables is wind... and we have the MOST need of energy in those winter months when we cannot survive without heating and it is a huge chunk of energy we use. Lithium batteries are not the best storage medium to take in sun in August or September and then store it for December-February when it will be most needed. And even solving winter heating here makes a lot of sense because it is a huge chunk of our energy needs. Probably best options to keep energy gained during summer to the winter month are either convert it to hydrogen or such solutions as the sand batteries for heat.

It could be use to store excess heat from data centers to improve the efficency.

@CUBETechie

23 күн бұрын

I think data centers could give the heat to a local central heating system?

@KK-dv3wh

23 күн бұрын

you would need a way to be pulling the heat out of the batteries at least on average at the rate the heat is being put in, since the data center heat output would be fairly steady and it doesnt need any of that heat back. buffering in sand batteries might let the heat be coupled to consumers better.

@junkerzn7312

22 күн бұрын

Data centers already recycle waste heat to some degree. The real problem though is that the "heat" you get out of a data center really isn't all that hot, and it is really really difficult to extract useful work out of something that isn't all that hot.

I was watching a video yesterday and the discussion included talk about homes with heating and cooling provided with the help of a heat pump. In France they're called a pompe à chaleur. The heat pump heats one storage unit with the heat from the other which is kept cold. The heat and cool of these two units help regulate the temperature of the home, cooling or heating as necessary. It's mostly for air temperature, not heating water, though that might be possible too. If you lived in a place where the average temperature was higher than you desire, the typical operation would be to cool the air in your home, while heating water. We know heat pumps work, so it's an idea for our times.

Man Thank you for all those precise/precious datas 🙏🙏🙏

I have contemplated creating a sand battery for personal home heating, using Sun tracking mirrors to heat the battery. Thank you for the video

using geothermal to heat and cool your house you basically are using the ground as a cold battery in the summer

@markhathaway9456

4 күн бұрын

Most uses with the heat pump are indoor-outdoor, but if you create heat-cold storages, then it might be more effective when the indoor-outdoor temperatures are less extreme. Also, if you have solar panels on the roof, you might want to cool them by bleeding the heat off and directly into your storage system.

A dual phase sand tank with separate cold and hot sides sounds kind of brilliant. You'd be able to do all kinds of amazing things with having both a chilled battery and a heat battery. Throw in some heat exchangers and suddenly your steel plants are powering your industrial freezers. The concrete plant down the street can cool the freezer of every local restaurant. If we think in terms of districts and communal sourcing rather than individualized solutions, economy of scale works in *everybody's* favor. It makes little sense for an individual house to power it's own hot water tanks when it would cost orders of magnitude less overall to do so for an entire city, plus there would never be any chance of running out of hot water.

@jordanhildebrandt3705

22 күн бұрын

I'm pretty sure you'd quickly run into huge losses if you try to run very hot or very cold water through long runs of pipe. A city-wide system would (I surmise) have far greater losses than using heat pumps for individual freezers and water heaters. Industrial freezers (and heat pumps generally) are already extremely efficient. With a good modern unit, you get about 3x more cooling than the amount of energy you put in. This is because heat pumps MOVE heat, rather than generating it.

Lithium battery $150/Kwh, Polar night Energy $85/Kwh, Batsand $2/Kwh. The insane potential of DIY sand battery.

I am a big believer in thermal energy. This was true even before I knew anything. I had a house that utilized a wood burning enclosed burn chamber in our mud room that burned wood very efficiently and heated a ceramic tile wall in the house. There was a ceiling fan near by to aid in distribution of the heat and that wall would stay warm for days. Think if you had something similar that heated sand with excess solar electricity then circulated air through steel piping in the sand to heat the wall. I feel too many people discount ideas such as these with arguments about efficiency. Once installed there is virtually no maintenance. This can be built with off the shelf equipment that would make repairs such as a blower motor easy to do. This type of system could last the entire lifespan of the home and could be self powered by the same solar system. Upfront costs, yes, but after that, you could have supplemental heat for life. The cost for this is not too much compared to the propane cost reduction it could provide. If I could reduce my propane by 30%, that’s like $500 a year, every year, forever!

Idk if you slowed down your speech, but this was a lot more understandable than usual 😅 You're awesome. Thanks for everything!

Great idea! Reminds me of Drake Landing Solar Community in Alberta, Canada, a neighborhood which stores so much energy in the summer that they can use it to heat all winter.

@koriifaloju2051

20 күн бұрын

Exactly It’s not a theory (any longer) but a proven solution that should be highlighted 🎉

@markhathaway9456

4 күн бұрын

And, how do they store it for long-term use ?

@nathanbanks2354

4 күн бұрын

@@markhathaway9456 They store a heat in a large underground area all summer, and it stays warm enough to provide heat all winter. You can't easily insulate something this well for a single house, but you can for a neighborhood. (Heat escapes based on the size of the surface area but the total amount of heat/energy stored is based on the size of the volume.)

Pretty good video, thanks for the details on the subject of sand batteries. It's great that low quality and can be used for this instead of beach/ocean sand etc

Another great video with fantastic informative points like the energy -> heat ration vs the heat -> energy ratio where I had no idea. This and many other reasons is why I love the channel 🎦🎦

@ipp_tutor

23 күн бұрын

Agreed!

3:23 insert heat pump comment here

@ipp_tutor

23 күн бұрын

Totally

@jasonbroom7147

22 күн бұрын

That's the biggest "gotchya" to this entire discussion...GSHP (ground-source heat pumps) are already better than the best sand batteries. The sun already heats the earth, such that the energy needed can be moved around (through heat pumps) to warm and cool your home, as needed. With that work done, heating water with a heat pump is also very easily done. My home has an air-source heat pump and hot water heater with a heat pump on top of it. My summer vacation place is going to use a ductless mini-split for all the same reasons. The sand battery is going to have limited application for metro areas with existing hot water radiator networks.

I stopped consuming any media concerning the development of battery technologies a decade ago. I'm glad I did. None of them went anywhere

for a home it is much better to use a huge tank of water right in the middle or your basement and maybe the first floor and constructing the stairway around it. of course you need some insulation around the water tank. due to the fact that an insulation is not perfect anyway some heat always leaks out. however, this "heat loss" is not lost at all, because the tank is in the middle of your house. that means that this thermal leakage is already heating your house a tiny bit. you can also implement two different tube coils inside at the top and bottom and extract and put in the heat very flexible because on the upper end it will always be warmer than at the bottom. this way you can heat the top end up with thermal solar panel to max. 40 degrees C because that is warm enough for your house heating system and then you switch over to put the additional heat at the bottom of the tank. for extraction you could do a similar thing. if the tank is very hot on the top, like 95°C, you take the heat out of the bottom or a mixture out of it to go with the right temperature in your heating. if the whole tank is getting colder, you could extract it only on the top of the tank. this installation lasts practically forever. and while having a basement is expensive, it is still very nice for a big hobby room, fitness room, party room, storage room, etc.

I love the concept of a sand battery it's old tech that has been provent o work in small applications so if can use modern tech to refine it the possibilities and environmental benefits are enormous. I can't wait to see where this leads

Well done!!

Outstanding video! I've got 5120 watt-hours of LiFePO4 storage, and many hours of wasted solar energy each day. I'm thinking of building a sand battery, using it as a solar dump load. Yours is the best video on this topic so far. Absolutely brilliant and thanks for sharing.

@OH8STN

23 күн бұрын

@jxpat watch this video

@junkerzn7312

22 күн бұрын

This is totally doable, though if you have access to the grid the easier dump is to just throw it onto the grid with a cheap micro-inverter. In your case, however, I would spend the bucks on adding more main battery storage to improve your overnight margin and give you some bad-weather bridging capability first, before worrying about energy dumps. One thing you are going to hit up against is, well, the weather. On hot days we have a ton of excess solar but no real overnight heating needs. On cloudy days or cold winter days we generally do not have enough solar so there isn't any excess to dump in the first place. That's a bit of a problem actually. One has to have excess production during the days or weeks where the dump can actually provides a useful service. -- In anycase, if you are going to do a dump I recommend doing it through a satellite battery instead of directly from the main system. That's what I do. I have a 48V main system (10kWh) and a small 24V satellite battery. I have a DC-to-DC which dumps any excess energy when the main system is full over to the 24V satellite battery. This way I can transfer excess energy at 1000W but my actual "dump" doesn't have to be 1000W, and I can control WHEN I actually dump to the actual dump independent of when the excess energy was being produced (which can be quite important actually). I then have a timer which turns on the actual dump from the 24V satellite battery at an opportune time for when the dump is useful. The actual dump device can be anything. It can be a sand battery, a small A/C or heat pumps, or a cheap little grid-tied micro-inverter if one has access to the grid, it can help the water heater, Etc. -Matt

Hmm a cold battery... nice!

I love the idea. Undecided with Matt did a good video about sand batteries not long ago, for more information.

great keep us posted on new dewelopmens in sand batterys

I'm actually planning on building one at my home

Could be an interesting use for all the unused office space in major cities. I imagine weight would restrict the number of floors able to be used, but buildings could easily have lower floors converted to thermal storage to help reduce heating and cooling cost, while also reducing the required occupancy rate. Especially if the building was able to store more energy than it used and was able to sell excess to surrounding office buildings.

Maximizing efficiency is great, but economics still rules. If a sand battery can be built, on a per watt basis, for some fraction of the cost of a Li-On battery, then it is going to have an advantage, even if it only has a 65% roundtrip efficiency. This sand battery technology also would seem to have a big advantage for longer duration electricity production than a Li-On battery, which could prove to be useful for overcoming longer lulls in renewable energy production.

@cbaronhj7

23 күн бұрын

65% rountrip efficiency is likely better than Hydrogen, which we should also be pursuing at scale. California already has a glut of renewable electricity during the day.

@ricza7345

23 күн бұрын

If the heat is coming from Photovoltaic panels those also have low efficiently. Would it be more economical to us evacuated solar tubes to heat sand, then use it for home heating and electricity?

@jaaklucas1329

23 күн бұрын

@@ricza7345 Have you seen the latest hybrid solar PVT? The panels also run tubing for water serving two purposes. Cooling the panels(which dont like extreme heat) and heating water. Ive seen this idea used in Europe.

@Psi-Storm

23 күн бұрын

They are comparing apples to oranges here. The current project has no reelectrification step. You basically pay $60/kwh just for the heat storage capabilities, while the battery system returns electricity at $150/kwh. The system is too expensive for just heat, because you are paying more than just the renewable energy production, like grid fees and taxes. Even if the electricity price was zero because of taking overproduction, you would still pay 10 cents for getting it into the storage. You can turn 1 kwh of electricity into 4 kwh of heat with a heap pump. Here you convert 1 kwh of electricity to maybe 0,85 kwh of heat, after it was moved from the storage through the district heating and into your home.

One missing point in this video is that the Li Ion batteries are Day storage, Sand Batteries can be used as seasonal storage, as Sand keeps the heat very long and is able to keep the heat from summer and move it to winter. On a limit, but much more than any other electrical battery system today!

One thing that is really hard to quantify is the cost to downstream users. The beauty of batteries is that users all already are set up to use power. If you want to bring a huge sand battery to share heat then every home or business needs to be set up tp directly use heat. Perhaps that happens in some areas of the world - but none that I know. Also, how much heat would be lost in distribution? How much would it cost to prepare infrastructure to move around that much heat without huge losses? So many more factors to consider! Thanks for the good video and view of something new!

@cbaronhj7

23 күн бұрын

which is why it is more interesting to use the heat to generate steam to run a turbine to create electricity

@funkenjoyer

23 күн бұрын

Umm as mentioned in the video it can be used for district heating, so you have a plant that provides hot water in a given area, nothing needs to change in the infrastructure outside of the plant, sure if you're running your own heating that's not gonna help much but it doesn't mean there are no use cases where it doesn't fit in perfectly

@SeeNickView

23 күн бұрын

Building codes. Most of Europe has district heating. Most of North America doesn't. If cities start planning to add this infrastructure, then you absolutely could see this in the future. Although most systems only change in response to scarcity or drastic disturbance.

@tobins6800

23 күн бұрын

In Alaska, they do use radiator/district heat. They also have underfloor piping as well as typical radiators.

Regarding you comment of heating with natural gas at the end of the video. I'd like to clarify for you and (moreso) others who may not realize that the US (i I'm assuming that's where you live. I do) obtained approximately 40% of it's electricity supply from natural gas in '22 and even more in '23 (43%) that's excluding the additional almost 20% from coal. Renewable sources only slightly outpaced that. (21%) I'm 100% with those trying to get us toward renewable energy sources. We've made great progress but we have to be cognizant of where we are right now and the trade offs of the future. It's good to know where we sit.

@jaaklucas1329

23 күн бұрын

No reason for thermal coal, start there. Solar is cheaper now. "Natural "gas, which is methane gas was the bridge fuel of the 90s not today. If I had to choose nuclear would be our bridge fuel for electricity generation for now. Natural gas energy plants can be turned off and on for demand, thats one good thing about them. Keep adding local renewables which dont have to be transmitted so far.

What good as well is that you can make sand with glass cheaply too.

A cold battery is know as ice storage which has been around for years. They used to be recharged at night when electrical rates were low. Now they are recharged in the day and are depleted at night when there is no cheap solar to power HVAC equipment.

What about heating the sand with concentrated solar power, and using it to produce desalinated water? Would it have any advantage over other desalination methods?

Cooling provided with heat is actually possible with ´absorption chillers ´ which were generally used in the oil and gas industry where excess gas was burnt to provide heat to run absorption chillers.

I think it is a fascinating idea to reduce the dependency of Fossilfuel for heating

I have heard of building techniques that regulate temperature by piping to areas far below surface. It also reminds me of traditional kim chee making where they bury jars of veggies to ferment at a constant temperature underground. This seems like something that could be very useful if integrated into new home construction. Not sure about the safety concerns living over a heat storage but I see potential.

I like your idea about using it to cool as well. It sounds like you are thinking of having more than one temperature bank. You could draw heat from one for your heating needs and sink heat to the other for your cooling needs. Keeping strategic temperature ranges in each would allow you to use passive heat transfer for most applications. At the lower temperature ranges you could also use hydronics for a passive transfer medium, and heat pump for active transfers. It would be interesting to see what the net difference between heat needs and heat waste is in our homes. If we had staged temperature batteries we could capture waste heats and use them to preheat the thermal medium in the higher temp stages so that they require less energy. Heat Needs: Dryers, Stoves, Ovens, Water Heaters, Home Heat - Air, Home Heat - Radiant Floors, Side Walk Snow Melting Coils, Roof Snow Melting Coils, Swimming Pools (maybe not in San Diego, but up hear in the North), Green Houses, Cold Lithium Batteries, etc. Heat Wastes: Fridges, Freezers, Chilled Water Dispensers, Air Conditioning, Freeze Dryers, Green Houses, Hot Lithium Batteries, etc. I'm thinking three to five stages, one really hot, and two at the opposite ends of the useful heat pump temperature spectrum. Perhaps two more, one at the freezing and boiling point of water, since it is probably the best passive medium. That would complicate the waste electrical power side of the equation a little bit more, but I wonder if it is worth it. I think of two exotic waste cases. The fictional Stillsuit worn on Arrakis (I loved that episode by the way), and the intricate thermal management of a real Tesla vehicle. Questions: 1. It sounded like you were saying that they use sand as insulation too, which makes me wonder if we use much better thermal insulation, how long do you think we can we store heat. Can we save passive summer heat and use it in the winter? What about the opposite, save the absence of heat from the winter to sink heat to in the summer? 2. What are your thoughts about using deserts and glaciers to moderate the climate on mega scales? For instance, what if we tugged a huge iceberg from one of the poles to the California coast and moved the ice inland to Death Valley. It could take several years to complete, but the resulting ice melt would be inland where it is desperately needed, while lowering temperatures and not raising the sea level. (I got this idea from the movie: Brewster's Millions) I'm waiting for you and Matt Ferrell to collaborate on an episode. You, him, and Grady Hillhouse produce my favorite channels.

I love the idea. There is also company called Caldera. They were doing 'smaller' sand batteries called WarmStone - sand sealed in a vacuum chamber. 2 tons of sand +500C deg and insulation of that void was so good that you could touch the battery with hand. They wrote that you could use it in your house heating system for even a month. They abandoned this product for homes and shifted to store and deliver heat for brewery and other big companies. The thing is this requieres 2 things. Hight class materials - heating elements, prepared sand without moisture, very good insulation - that vacumm was a sweet spot, but its hard to manufacture alone, so you need to build almost like a new house with ceramic coating and thick insulated walls. Secon is amount of sand - something like 10 tons should be a good starter. Plus good pumps, pipes, sensors etc. Then good plan to take that heat out and plut into waterboiler and floor heating system etc.

When people picture sand spread across idyllic beaches and endless deserts, they understandably think of it as an infinite resource. But as we discuss in a just-published perspective in the journal Science, over-exploitation of global supplies of sand is damaging the environment, endangering communities, causing shortages and promoting violent conflict. Sand is not the answer as it is used in so many everyday projects in economies around the world and numerous countries are already in short supply. The negative consequences of over-exploiting sand are felt in poorer regions where sand is mined. Extensive sand extraction physically alters rivers and coastal ecosystems, increases suspended sediments and causes erosion. I suppose the west could replace it with the garbage they produce to replace the sand; which of course would never be called exploitation of the poor and lead to world wide social unrest.

@edgelord6560

23 күн бұрын

We can use only river sand for construction. That's why there's a shortage but desert sand is almost unlimited

@anthonycarbone3826

23 күн бұрын

@@edgelord6560 There are two major sand Deserts. One is the Sahara located in the Middle East/Northern Africa and the other is the Gobi located in China. The first is one of the most politically unstable areas in the world and the second belongs to a country that has to support 25% of the worlds population. So you want the USA to depend on China even more let alone the area that already controls the majority of easily obtained oil.

@anthonycarbone3826

23 күн бұрын

@@edgelord6560 Sand is the most abundant solid substance on the planet, but we also use it more than anything else. The only two things that are consumed more than sand is air and water. We use about 50,000,000,000 tons of sand every year. That is a quantity large enough to cover the entire state of California. Cut out California on a map and then go ahead and try to copy and paste in on other parts of the world. This is the problem of big numbers. But essentially, it’s impossible for us to conceptualize things in the billions that we consume by the dozen.

@Debbie-henri

20 күн бұрын

​@@anthonycarbone3826Doesn't America have deserts of its own? Seems to me that there are plenty of deserts in those cowboy movies you consistently sent around the world. Or are they are protected in national parks and can't be touched?

@anthonycarbone3826

20 күн бұрын

@@Debbie-henri Much of the desert land in the USA is controlled by the Federal Government in Parks and other Federal Land Management. You do understand taking all of the sand destroys the surface ecology for both humans and wild life. Do you really think the tree huggers are going to stand by and allow real destruction of animal habitat and National Parks. This is not something that is underground and out of the public's notice. Plus deserts are prone to flash floods and without the sand the floods will cause even more irrevocable erosion which sets off a chain reaction of even more dire consequences for everything living in the area.

A cold battery makes a ton of sense. Use a ground source heat pump to cool large sand battery. Run a hydronic loop through the battery to your fan coils using a mixing valve to control the temperature of the water. You would want to cool the battery down as low as can be done efficiently by your heat pump. And size it to last overnight on your hottest night. The hope would be that your solar array would be enough to charge your DC batteries and cool the sand battery far enough to make it overnight. This is made easier by the fact that the hottest nights are generally preceded by the longest sunniest days.

This reminds me of Sam Altman's investment in Exowatt (thermal storage). Maybe additional efficiencies can be garnered from heating and cooling. Data centers generate a lot of heat. Cogeneration architecture, dealing with electricity and heat.

Have you been to Minnesota in January? I think we get cold too. Can you do a video on how district heating works? Have US communities tried district heat? I feel like the energy and HVAC industries have us convinced that it’s not a good investment.

I saw the polar night thing when they first installed it, seemed genius, so i built a small scale one using an approx. 1 cub yard of sand and a small wood stove. it has worked 2 winters now, but i still haven't worked out all the issues yet. i need to move more heat from the wood stove to the sand instead of heating my shop to 80+ degrees. I burn a small fire for approx 5-7 hrs per day, and the heat radiates off the insulated sand box at night and does a good job keeping my 1200 sq ft shop toasty warm all winter. saves a truckload of firewood compared to just the woodstove i had. plan to connect solar panels to it soon!

@markhathaway9456

4 күн бұрын

Check out videos on using a Rocket stove to make and direct the heat you want to store.

I see a few problems here:- How exactly are we gonna transfer energy in n out ? Suppose we are using a steam driven turbine to take heat out it won't be abt to take all the energy. Like we will only be abt to exhaust 1000° C energy to 100° C energy coz steam can't exist below 100°C or so. Will the hardware used to heat up the system be efficient enough to transfer all the heat to the sand ?

One company which produces absorption chillers, which perhaps is still operational is ´Carrier Ibara ´ based in Japan.

2:30 can't we redirect the demand better so it can be used for energy intensive processes? 2:52 i just wondered why there are no Solarpanels on the roof?

Wait, why are sand battery silos built upwards and not downwards (into the ground)? Wouldnt that help with thermal insulation?

Interesting tech. BTW heat can power refrigeration too, look up propane powered refrigerators

This brings up a question for greenhouses in the winter. Would it be better to have a separate sand battery to heat the greenhouse or would it be better to integrate it into the flooring cement the greenhouse? And would it be better just to run pipes within the sand battery to increase the floor heat or would it be better to use a heat exchanger to heat the air?

Why would it take up any Acers? Couldn't you put the tank under ground?

@LauraRealLife

23 күн бұрын

Off hand, additional installation cost and maintenance access would probably be the primary reasons not to put the tank under ground. Digging/excavating a big enough hole can be expensive. If placed underground, you also might have issues with sinking, groundwater infiltration, seismic instability, etc. If there is any issues with the tank, maintenance and repair of the tank would be a lot more expensive and time consuming. Having said all that ... placing it underground might have some advantages, such as the tank being more insulated by the surrounding ground and other advantages.

@PapaWheelie1

23 күн бұрын

Or just use the sand that’s already there

One thing to remember when comparing the cost per kwh of a battery vs heat storage is that the electricity from the battery can be used with a heat pump which can have 400 to 500 precent efficiency in converting electricity to heat but also can be used for cooling. But in really cold environments, the sand battery seems like 8t could be a good idea.

@laresilience5829

9 күн бұрын

But the heat could come from concentrated solar which is 95% efficient at catching sun rays instead of 20-25% photovoltaic with also a lot less copper silver silicon etc

How about using absorption chillers to cool the home during summer?

Can recycled glass be used?

It's fascinating how sand's ability to retain heat offers a sustainable and scalable option for energy storage. 🔥

@stefanweilhartner4415

23 күн бұрын

water is three times better and much cheaper, if you keep it below 100°C

@Fenthule

23 күн бұрын

@@stefanweilhartner4415 *if*, and at those temperatures you lose a lot of the efficiency because the greater a temperature difference between two things, the quicker the heat transfer occurs. If you want to have a line of 80 degree air coming out of the tank, it would take significantly faster to get to that temp running through 800 degree sand than 98 degree water.

@stefanweilhartner4415

23 күн бұрын

@@Fenthule but i don't need it quick in the center of the basement of a house.

@AnalystPrime

23 күн бұрын

@@stefanweilhartner4415 Water stores less heat, can corrode the tank or spring a leak. For homes using rooftop solar power to heat the existing hot water tanks works fine already, but we are talking about grid storage here.

@markhathaway9456

4 күн бұрын

@@Fenthule Do you mean to say that the heat transfer is FASTER when the temperature difference is higher ? Or that it's FASTER with certain materials like water ?

Meanwhile in Australia, they tell us glass will be more expensive because the world is running out of sand.

Ammonia cycle refrigeration would work great with this sand battery system.

Based on what you said in your video on a 100-ton sand battery heating 100 homes in Europe, an average home would only need 1 ton of sand to heat that home. One ton of sand equals 22 cubic feet.

I can’t remember the show but instead of sand they froze a like a 4’ square box of water at night when energy was cheap to help the a/c during the day. Pretty sure it was a library or public building and in California

@CorwinPatrick

23 күн бұрын

There was one in Texas too, I think

Hot and cold sand batteries? Now you’re getting into some interesting territory here. You’re also going to be able to collect condensation for drinking water in such a system, because you need hot and cold to absorb water from the air. On top of that you’re using excess energy that would have been wasted to get it. Pushing the idea further with more tweaking and you have a steam engine that barely runs out of water and fuel and has the potential to become an engine that runs on the atmosphere around it.

My only question is this: What kind of sand do the batteries take? For example, does it take rough/course sand that is used in construction and concrete or the fine and smooth sand from oceans and African deserts?" If it’s the latter, could that help reduce brine from our oceans when we desalinate our waters? . I figure this product of theirs would incredibly valuable if it contributes to solving this problem of Brine.

Very interesting 🤔

Sand batteries are a good idea, a simple and cheap method of storing heat in the warmer months for use in the winter months by making use of surplus green energy, this would be ideal for North America/Canada, Northern Europe including Russia, and northern Asia including China to see them through December, January and February. But given the amount of sand required, I would view it as impractical for an individual home, but if you are building a street of 30 houses, it could make sense to scarify one plot for a big sand battery (which could at least have the facia of being another house) and be capable of suppling heat to the other 29 houses. It would definitely make sense for large buildings, like schools, hospitals, office blocks,Apartment block and shopping centres, although it could be argued that in a city there would not be enough space for a large sand battery, but what if the ground floor of any large building was to become the sand battery, and human activity were to start on the first floor, in a similar way the ground and first floor of a multi-story car park could be filled with sand to provide heat to surrounding buildings, alternatively you could bury the sand battery underground, but if a maintenance issue required you to empty it of sand this would be complicated. There might even be a case for sand batteries to be situated next to the junctions of main roads, like crossroads, roundabouts, or sharp bends, anywhere were braking or cornering takes place, a sand battery could provide under road warming for 100 yards either side of a potential hazard point, just enough to prevent ice forming. there is a growing number of places using district hot water systems to provide heating, may be there is the opportunity to combine an underground hot water reservoir heated by surplus green energy as district heating, and supplement that with an above ground sand battery also heat by surplus green energy I am reasoning that a properly insulated sand battery should hold on to its heat much longer Than a water reservoir, and would therefore be used to top up the hot water reservoir right through to the end of winter, with out having to rely on a fossil fuel back up, by thinking on multiple levels, you could get double the heat storage on the same ground area.

Check out Batsand for a domestic solution when you come back to this. Also Antora, both for their high temp heat and also their interesting IR PV heat to electricity solution.

Sand battery powered Tesla... coming soooon! Oh yeah 😎

@ipp_tutor

23 күн бұрын

LOL That would be a site to see!

@ipp_tutor

23 күн бұрын

I wonder how long a Tesla would go if you swapped the battery pack for an equal mass of hot sand. Interesting question

@RP-hn1qc

23 күн бұрын

​@@ipp_tutorI'm an irresponsible stoner but my uneducated guess would be zero miles. > pulls battery out > pours 1000 lbs of scorching hot sand in car > FORGETS device to convert heat to some other form of energy Y'all need to go touch grass and go camping to learn the hard on how to properly think ahead.

You state that this wouldn't work very well during the summer (other than your "cool battery" you mention later on). However, this would work great in the summer as well for "passive" cooling. Using a large radiator of sorts above the home, create an updraft through the home cooling from conduit that's in the ground. Even if not using it to "directly" cool the home, use this cooler air as the ambient "outside" air for an airconditioner to transfer heat into out of the home, making the aircon far more efficient. The pumping would almost be not needed for this type of loop as convection would keep hot liquid at the top of the draft tower/vent.

Correction...( 3:16) 1100 degrees Fahrenheit.... 660 Celsius ( at least according to your own text, on-screen)

Great topic. There have been many “batteries” like this. Simply a means of storing energy. The real killer app will be the super capacitor. The ability to store massive amounts of energy quickly could change everything. Imagine a super capacitor connected to a sand (heat) battery. Theoretically one could capture lightning instantly and then feed that into the sand battery. Then draw the energy out in a controlled fashion from the battery. It’s only a question of figuring out the materials and methods. Definitely not simple but it is physically possible

So why not use an inverter to boost up the power on either end?

Maybe there exists some sort of a substance you can add to sand batteries such as brine they extract from water desalination. Is it possible to use some sort of quantum dots to enhance sand batteries?

This idea can be home make easily !!

I think for ''Cold" battery, just freezing water would be great. Use solar during day to make a bunch of ICE and at night air can circulate through the ice cubes and cool your house.

Imagine if the sand bank was buried and you build a greenhouse on top All leaks make for a tropical greenhouse in like canada as you can draw extra if needed but losses are just warm soil used for agriculture

Peltier devices would pair nicely with sand storage. Efficiency would be awful but no moving parts for maintenance. Heat one sand battery and cool another during surplus and then reverse for generation

@junkerzn7312

22 күн бұрын

Efficiency would be more than awful but I agree on the low maintenance. Efficiency is kinda the crux of the matter, though... if one is over-producing so much that one can still get something useful out of multiple stages of an extremely inefficient dump, its better to do something more direct with that overproduction than stuff it into a sand-battery.

1 huge advantage is that a sand battery, if done right, can hold temperature for many months, you can charge it in the summer and heat your home in winter with it, when solar is at its lowest output.

@abarairenji4483

16 күн бұрын

My biggest concern is what do you do with it during summer? It's not going to take all summer to charge it. I live in a part of Africa where energy and electricity overall is very scarce. But it's also very hot here most of the year. Can really say it only gets cold 2 months of the year here. So my question is, what application is there during the other 9-10 months of the year. I'm curious to see how one could use the sand battery as an alternative to air conditioning

@nikm3r

16 күн бұрын

@@abarairenji4483 hot running water, no need to ever use a boiler or whatever again. But it's more catered to northern climates, that have 3-6 months of need for heating.

@abarairenji4483

16 күн бұрын

@@nikm3r true, hot running water would be an ideal solution. I was thinking of converting back to electricity. Yes you lose about 50% energy when doing this but considering it's in a region where the grid only powers about 35-40% of residents, I don't think that energy loss is too bad right?

@nikm3r

16 күн бұрын

@@abarairenji4483 it would really depend on how cheap solar + regular batteries vs solar + sand battery + turbine to turn the heat back to electricity would be in your area of the world. Do the math! I just saw your name btw, nice!

@abarairenji4483

16 күн бұрын

@@nikm3r hehe, thanks. Appreciate you taking the time to educate me a little. 👍

Sand batteries would be great for domestic applications. They could be located under a driveway or garage and provide a hot & cold geothermal sump/source for heat pumps. Heat pump COP could be boosted significantly with this technology. It would be ideal for continental climates - hot days/cold nights. We have to get smarter with pumps and thermal distribution generally.

Why is the Sand Battery built above ground and not below? Curious.

I have been using sand batteries for 4 years in a greenhouse it works responsibly good. I use a solar collector in a circut using pex pipe. I’m considering using solar to run heating elements so I can obtain higher sand temperatures.

@laresilience5829

9 күн бұрын

I have been thinking of that How do warm the battery and where is it? In the greenhouse itself?

Cold battery is an interesting idea. But for that you could use water, the phase change of going to ice would store a massive amount of energy, much more than you could get with an equivalent volume of sand without going to super low temperatures which would kill efficiency.

There are cooling systems that work with heat. Refrigerators that work with propane gas and do not have an electric compressor are an example. In summer you can use the heat of the sand to cool Using an air conditioner with technology similar to old gas flame refrigerators

There's companyies like Potters Industries that could help make it cheaper by using Glass Sand.

What goes around comes around! My first home I bought in 1965 was heated in exactly this way - thermal blocks.

@markhathaway9456

4 күн бұрын

How were the blocks heated? How long did they hold the heat? What were the blocks made of?

@Wol747

Күн бұрын

@@markhathaway9456 I can’t remember what I had for breakfast today so don’t rely on my recall from half a century ago but they were a cupboard full of heavy brick sized thermal blocks with electrical elements sandwiched within. Air was blown through holes and came out all toasty through floor grilles.

When are going to do a video on tidal & ocean current power generation?......

I like geothermal for cooling and heating. Ground is a great medium.

The large capacity for storing heat comes from the max temperature, which is easy to achieve through resistive heating coils. But on the cool side, it seems to me that you would have to get much colder than freezing to have a similar cooling capacity. Is there technology that can achieve very cold temperatures efficiently with electricity? On the topic of usefullness if used only for heat. I remember a video on this topic that mentioned very northern locations that don't get much sunlight in winter. The heat battery was useful there because they could be heated during the summer, and would hold their heat for months into the winter.

The byproduct of Bitcoin mining and any data center is resistive heating, and it should be used any time resistive heating is mentioned in renewable energy.

@NoHandleToSpeakOf

23 күн бұрын

The density of that heat is quite low though. That limits it's usefulness.

@ipp_tutor

23 күн бұрын

The circular energy economy!

@RP-hn1qc

23 күн бұрын

​@@NoHandleToSpeakOfLiquid cooling of mining is becoming more common as the 30 to 50 sound db level drop is life-changing for the better.

@NoHandleToSpeakOf

23 күн бұрын

@@RP-hn1qc Sure, but how do you cool the liquid?

Like the balanced view, heat batteries are just one more tool, in the energy storage war. Simply right tool for the right job. Sand batteries would be great for heating pools in more tepid areas The other major benefit is life span compared to lithium and that really comes down to the quality of piping , heaters and fans, The sand isn't a wearable item in the equation.

Good evening all. I like the cold storage concept and I wondering why one would spend money for a sand storage facility instead of going directly to Geo-thermal storage? One will still need battery storage to run the systems without grid assistance. How big would a sand storage system need to be to to keep 100 square meters of your home, home X in location Y, comfortable throughout the year? I am embarking on a massive home remodel in California, and heating without Gas is starting to look like an excellent idea. Thanks 🦊Riki2Tails

90% round trip efficiency, when the heat is used directly & only 65% efficiency when the heat is converted back to electrical power. I assume for both of these numbers that the heat was transformed from electrical power by using thermal resistance. What would be the efficiency numbers, if a heat-pump was used instead? Using electrical power to "make" heat with thermal resistance, is as you said, almost 100% efficient, but heat-pumps are even better since they don't "create" the heat they just move it around. So would using heat-pumps instead of resistance make this process competitive with lithium-ion batteries in terms of efficiency?

I am building a passive house with radiant floor heating. I have to insulate under the slab-on-grade and this got me thinking. What if I dig a bit deeper, insulate, then put down a layer of sand with the Pex piping in the middle of the sand layer, followed by the concrete flooring above. Would the sand battery under the slab make the entire flooring more efficient? Should the PEX go in the sand or the slab? Has anyone done this? Someone must have, but I can't find any information about it. Please tell me your thoughts.

@koriifaloju2051

20 күн бұрын

It could work, but get a “open-minded” mechanical engineer to do some heat loss heat gain computation, you’d need to ensure it doesn’t overheat ( which is a different problem, even in very cold climates) I did something like that but using earth tubes that were charged/ recharged and it worked fine 👍🏿

@einarmikkelsenPNW

19 күн бұрын

Thank you, Kori. I'll see how open-minded of a mechanical engineer I can find :) @@koriifaloju2051

It is conceivable that the stored heat from a sand battery could be used to generate electicity by means of a stirling engine.

LHTPV batteries have some benefits over sand. For one, it's electric energy in and electric energy out.

When it comes to heat energy storage, besides cost of the storage medium, volumetric heat capacity is an important consideration. For instance silicon dioxide has a 1.855 J/(cm³*K) But sodium chloride is 9.04 J/(cm³*K). This means sodium chloride can store more than 4.5× as many joules of energy for each degree of temperature rise in a cubic cm. Yet both cubes have the same surface area to lose heat over. In other words, for each joule a cubic cm of silicon dioxide stores, a cubic cm of sodium chloride rises in temperature by less than 1/4.5 that of the silicon dioxide. And how fast heat is lost given the same surface area and insulation is proportional to temperature. Bulk sodium chloride and sand have similar cost so per cubic meter, so its volumetric heat capacity should take on a more important role in consideration.

People have been doing this stuff for decades. Heating their ground with solar energy during the summer and using that energy during autumn and winter. And the opposite during summer. Without heat pumps.

Sir do video about fusion power

@MJ-yv9il

23 күн бұрын

I think he did

@jaaklucas1329

23 күн бұрын

Future tech, replicating the heat of the sun. Hard to ramp up but a lot of brainpower going into it.

Please review BLOOM BOX technology.