Sand energy storage
Sand is a suitable material for energy storage? When, after a sunny day we'll come to the beach at night and get our hands in the sand, will be tepid. In our country must do the children's sandbox in the front yard. The sand actually accumulate the sun's heat. It is possible to take advantage of it and save energy for the colder season?
Surplus electricity produced with wind power and with photovoltaic equipment it is necessary to somehow save until I find the right use. In the Finnish company Polar Night Energy focus on energy storage into the current building sand. The technology called "Sand battery"
The principle of the solar battery
The thermally insulated cylindrical reservoir with a diameter of 4m and a height of 7 metres was placed in front of a hundred tons of sand. Source of electrical energy, thus the myriad of renewable produced electricity in the electric heater air power 100kW heats up the air that passes through a coil placed in a tray filled with sand.
The heat is accumulated in the sand, while the temperature itself, the sand reaches 600 to 1000°C. The storage capacity of the reservoir is 8MWh. When a request for the supply of heat transmit to transmit the sand in the heat exchanger air/water heat water in the heating circuit of the building.
The reported efficiency is 95% and the investment price of the kWh is under 10Euro. The device has to be capable of following the month to store thermal energy without major losses.
Finally, the principle of how to hide unused energy for a rainy day, I would like to say. Upon closer investigation, however you encounter skeptics, who doubt about the primacy, and about the effectiveness of the sand of the battery. https://protonsforbreakfast.wordpress.com/2022/07/21/a-sand-battery-not-obviously-a-great-idea/
https://www.treehugger.com/viral-sand-battery-isnt-what-it-seems-5547707
The authors question the relevance of overheating of the air at a high temperature, as it is otopová water heated to less than a tenth of the temperature of the air. Other doubt exists about the speed of escape the heat mantle reservoir and the length of the accumulation referred to in months, seems to be more of a marketing attraction, than the description of real traffic. Also, the capacity in the hundreds of units of megawatt-hours is sufficient for the consumption of two family home, which is the dimensions of the tray is a little bit too.
If overheated air from the sand of the battery served for the production of electricity, it is estimated efficiency at 20% to 25%. This is a good result, because the classic chemical battery has an efficiency of 95%.
That there is no energy storage in the sand, a revolutionary new product, it can give even the work of Czech innovators, who in their time have tried to solve the problem with the accumulation of heat for countries with water scarcity. I enclose a link to the part of the opinion, that, while in another case, describes the inefficiency of the sand storage of thermal energy. Electricity from solar energy using accumulation in silica sand
Energy with Farkym
Definitely the fuss is about sand battery aroused the interest of many of the domestic kind of smarts. On youtube is to watch a few videos, where enthusiasts heat the sand to be resistance wire, or the heating coil from the washing machine. The idea for the second video is even more perfect.
Pros
- the sand is easily available material
- easier on the material of the stack compared to the water tank
Risks
- high leakage of heat into the surroundings
- the load of the structural elements of high temperatures
In conclusion
Storing surplus energy from renewable sources is one of the most pressing problems. We have a lot of innovation and blind alleys. I can imagine that the sand of the accumulation of heat leads to bridge part of the day, when resources are not produced. A longer period of time, or even the summer heat storage for the winter it seems to me as too much of a bold statement. We'll see. Perhaps we will see some specific information from the practice.
This mr. I ma a few years and speaks highly of it:
https://www.electrodad.cz/sezonni-akumulace-tepla-do-132-tun-pisku-rd-moravsky-krumlov
I call a practical use. I was excited that the space would normally without the benefit of buried and thus found application. Amazing is the utility room – a direct outfall pipes of the sand bed – bomb. Even it is seen that mr. Mach above all a lot of thinking.
It's incredible how the story got old. This is similar to when it was scientifically proven that objects heavier than air can't withdraw from the country. Today, we already have a repository in practice, in Finland, Germany and the us, too. And not only that of the sand can heat the whole house, but it's real and feedback the production of electricity.
Well yeah, it's misery. Do you have any links to existing storage? And thank you for the info. Ekokutil
Well, the lord said that the akumlace last him well into Christmas and then just have to heat a heat pump. From my point of view I on the passive house'm also drowning without akumlace heat up at the end of November so such a difference it's not. But the solution is definitely interesting if one has the space, but economically it according to me against passive house with occasional přitopením in the fireplace can never come out...
Have a passive house is a win. Excellent preventive measure. It's good for You.
Sand storage is very space consuming, which significantly limits and almost entirely avoids the use in existing buildings (unless there will be a variant of the outdoor silos). In general, the technology seems industrially applicable. I can imagine her being with bioplynky, where I'm choking surplus heat. For home use seems to me to simply large.
Pro info, tato firma vyrábí „kontejnerové pískové baterie“: https://www.magaldigreenenergy.com/en/thermal-energy-storage