Questions tagged [energy-storage]

Long-term storage of energy is a difficult technical problem that limits the usability of renewable sources of energy to replace traditional fossil fuel sources

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How does force-free SMES design look like?

Recently I stumbled upon the topic of superconducting magnetic energy storage. One of the limits on the maximum amount of energy that can be stored in such systems, is imposed by the fact that ...
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Unusual temperature shape in gravel heat storage

I’m currently doing undergrad research on using a gravel (basalt 2-5mm grain size) bed as an heat storage. In order to heat up the gravel inside, hot (~100°C) and dry (RF<4%) air with a pressure of ...
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Self-sustained water flow and E-generation between tanks due to air pressure?

I am wondering about the concept of water flowing from one place to another due to air pressure and have a question about the limitations in the real world. Don't understand me wrong, I am not trying ...
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Why does pumped hydro require reservoirs for efficient energy storage?

The problems with using pumped hydro as a long term battery are: Hard to find locations physically suited for an extreme height gradient for two massive reservoirs (main issue). Water evaporates, so ...
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Superconducting energy storage and voltage [closed]

I've been reading up on superconducting magnetic energy storage, and while I know how the energy is stored ($E=\frac12LI^2$) I have no idea how the discharging works. Specifically, as per this paper 1 ...
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What is the most common method used to cool hydrogen below its boiling point?

I would like to know what methods companies/organizations/scientists use to cool gaseous hydrogen below its boiling point of ~250 degrees Celsius. I am a new student to thermochemistry and am not ...
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What do maufacturers do to ensure that a valve is capable of containing hydrogen gas? [closed]

I am a researcher working to develop a hydrogen fuel system for use in a specialized internal combustion engine. The biggest challenge from an engineering standpoint with a project such as this is the ...
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3answers
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Why aren't gravity batteries everywhere? [closed]

The problem of energy storage, especially with regard to renewables, remains unsolved. Or at least there do not seem to be any popular solutions. Why not gravity batteries? I love the idea, and ...
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1answer
164 views

Unlimited energy storage using relativistic flywheel?

Theoretically, is it possible to store huge amount of energy using a flywheel that spins at speeds that approach light speed? Can the amount of energy be higher than the mass equivalence of the wheel?
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1answer
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Force on Dielectric on pulling it out from capacitor

This is the text from Griffiths Electrodynamics for calculating force on dielectric on pulling it out from capacitor when the capacitor is connected to Battery so that voltage of capacitor is fixed: ...
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Can we use the stored gravitational potential energy of a building to produce power? [closed]

There are skyscrapers sitting and pushing on the ground with tremendous weight. Is it possible to convert this weight/force to harness energy to power the building? Maybe build the building on top ...
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Carbon capture and liquid air energy storage - a single system?

I've noticed these liquid air energy storage projects. As the process consists of phase changes between air and liquid I was wondering if it would be possible to extract CO2 as part of this process? ...
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Can a water vortex (whirlpool) be used to efficiently store energy?

Either a large, constrained cylinder of water or a large volume of open water (perhaps in the ocean) could be persuaded to form a vortex by pumping energy in. The body of water would be acting as a ...
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Superconducting Magnetic Energy Storage (SMES)

I cam across SMES (Superconducting Magnetic Energy Storage) while researching superconducting and had a few questions I'm hoping to have answered. I have read that SMES devices are primary used in ...
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2answers
227 views

Amount of energy that can be stored from Faraday flashlight / linear alternator?

You'll have to forgive me if this question is either extremely elementary or does not make sense — I am a civil engineer with little E/M physics background beyond high school education. I am working ...
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1answer
111 views

Hydrogen as energy storage

How viable is hydrogen as an energy storage medium? It would be extremely easy to split water into hydrogen and oxygen . It also has high energy content so relatively a large amount of energy can be ...
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Challenges with energy storage in batteries

Just before saying anything, I just want to warn you that I don't know much about batteries and energy storage, consider that you are talking with a kid of 8 years and a half. Maybe this question is ...
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129 views

Could someone explain the Forster Resonance Energy Transfer?

My understanding of it so far is rather messy, and I haven't found a good source yet that describes WHAT it is rather than just stating lots of equations! I have read a source that mentioned it having ...
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516 views

Buoyancy and natural convection in a stratified water tank

I'm working on a simple calculation-model for a hot-water-storage. At the moment I'm stuck on implementing natural convection. To calculate the temperature I've implemented a simple 1D-model in ...
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1answer
224 views

What is maximum energy we can extract from electric field?

I was reading Does Electric field has mass Energy; it gives energy density k stored around an electric charge as $ k = \dfrac{q^2}{r^4}$ in skeleton form without any constants. So, a definite amount ...
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165 views

Data storage in flash drives

In a pen drive, I have read that data is stored by trapping the electrical signals sent from the computer in silicon dioxide chambers. But what I dont understand is that how does the electrical signal ...
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Is it possible to trap hot air at 50 degrees for an year or more [closed]

I have this question that has been running in my mind for days now. Lets say i have some air which i have heated to 50 degrees Celsius. Is there a storage mechanism i can lock this air in and store it ...
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Why don't they use springs as an energy source for cell phones?

I know they used springs for clocks way back in the day and now it's all lithium ion batteries. For reference, consider the Iphone that has a battery with a capacity of 5 Watt hours (18,000 joules). ...
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Flywheel energy storage: Why not use room temperature diamagnets instead of superconductors?

Flywheel energy storage has garnered some interest from academia and industry for its potential to store surplus electrical energy efficiently in kinetic form. Modern designs use magnetic bearings ...
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Is the amount of hydro-electricity harvested, proportional to the number of turbines? [closed]

I've looked on this site and people have said that it wouldn't make more energy that it would cost to have water turbines on a water tower. But if it only takes say three pumps (I don't know what it ...
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Does a pulled rubber band contain as much energy as a twisted rubber band?

lets say I take two similar rubber bands. One of them I pull until it almost reaches its breaking point. The other I twist until it almost reached its breaking point. Do both of these rubber bands ...
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WHY does the "order" of a differential equation = number of "energy storage" elements in a system?

OK. in all engineering courses there comes a point when they introduce you to systems theory and modeling of systems (for eg. via the impulse response) and then the Laplace transform. The modern ...
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Energon: is it possible?

I'm always quite curious about the "Energy cube" in Transformers, or namely Energon. Is it really possible to store energy, such as electricity, into such a compact form? safe to distribution, and ...
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Storing kinetic energy instead of potential energy - practically possible?

One of the big problems today considering energy is its storage (e.g. batteries are not that efficient, very expensive and polluting). Energy is classically mostly stored as some kind of potential (in ...
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159 views

What is the minimum and maximum limit for Hydrogen Adsorption distance?

In chemical adsorption of H$_{2}$ molecule, the distance is limited. In the physical adsorption, the distance of adsorption is limited or can be any value? Is there any correspondence to adsorption ...
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How does a flywheel generate electricity at a constant voltage?

I believe I am missing something simple here. My question concerns flywheel energy storage. Say we have stored some amount of energy in a spinning flywheel. The flywheel is attached to a generator. ...
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353 views

Can the technology behind Particle accelerators can be used for energy storage?

As I understand, the kinetic energy of the proton beam in a hadron collider is quite large. Can you build a energy storage system that is based on accelerating a proton beam to relativistic speeds to ...
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102 views

what are the main factors holding back magnetic energy storage systems?

Perhaps is it the magnet's own magnetic field that causes it to lose its superconductive state? It seems as though these systems could become incredible energy dense.
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Electrical energy storage in superconductors

I am a first year A-level student and I am doing a project about the possibility of storing electrical energy in a superconductor. I have researched and I am aware of the critical current density and ...
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Why can't we store light in the form of light?

We can store cold (ice), heat (i.e. hot water bag) and electrical charge (batteries). We can even "store" a magnetic field in a magnet. We can convert light into energy and then, if we want, back to ...
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932 views

What are the current possibilities for large-scale storage of electrical energy?

I'm curious as to how large-scale electrical storage is managed now, how much they can store, how well they scale and for how long (and what is their loss rate). (I'm not asking about technological ...
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How many grams of explosive are equivalent to the energy in a battery?

In the movie Terminator 3: Rise of the Machines, Arnie's fuel cells were twice shown to be extremely devastating when their stored energy was released. In real life, how many grams of, say, gunpowder ...
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why ammonia is not a competitive energy carrier?

reading this article about Germany planning to store renewable energy as hydrogen gas, i'm left wondering why they deem so great this plan, compared with other alternatives like ammonia as a energy ...