Storage Definition and 248 Threads

Hi all, I'm thinking of buying a new water heater, and still confused to choose between storage water heater vs demand water heater (tankless). Can anybody give me the pros and cons of each? what I have so far: 1. Tankless consumes more power, and the longer you shower, the more it consumes...

Hi All, Looking for some help (any is greatly appreciated). I've been tasked with the below, and am unable to find a worked example to cross check my work against. If anyone with a greater knowledge than me could have a look at the below and advise if I'm right the right track. Thanks 1...

Can there be a system that utilizes mechanical energy to produce kinetic energy, but "storing" the mechanical energy to be used at a different time for kinetic energy? Like a bike where you pedal but don't move; that mechanical energy is waiting to be "released" by some mechanism *** exclude...

I'm just starting to learn about the physics behind Faraday's laws and magnetic flux and it's gotten me thinking a lot about superconductors. I know that you can store energy in a superconductor in the form of magnetic fields since a current in a superconducting loop will persist indefinitely...

Hi all, I'm interested in the latest development in battery technology. as of now, from what I understand, the most advanced tech in energy storage (battery) is created by Tesla, the PowerWall. but, even that, can only store 14kWh per unit. my house consumption is about 10kWh per day. my...

Are computer files the only way a computer stores data/digital information?

Hi, My teacher asked that i should design a efficient energy storage system for a plug-in electric vehicle. I have no idea how i can use some equations for designing this type of car. The requirements are in below; Test cycle range: 140 miles Test cycle energy: 260Wh/mile at the output of the...

I am working on "electrical energy" storage and I want to know why exactly can't we store "electricity" from a power plant. My understanding is that "electrical energy" storage actually refers to the conversion of electricity to other forms of potential energy (such as mechanical eg: dam, or...

Hello members, I wish to produce and "store" "Methane" gas. I wish to accomplish this task by conducting out a reaction between carbon-dioxide an water. I have my own source of energy and I completely understand that the reaction is endothermic. The reaction is: CO2 + 2H2O + energy = CH4 + 2O2...

I've been looking into compressed Hydrogen storage, and it seems that the high pressure containers have a lot of layers on the inside to keep the Hydrogen from leaking out/diffusing over the lifetime. However now I'm curious as to whether you could use a tank to store high-pressure Hydrogen (in...

I get these thoughts about a story but I know I won't put them down and build on them, so they seem wasted. Therefore, if you like anything I post in this thread feel free to use. ***** I was in my mini-bunker, ready to hunker down for another night of sporadic attacks, when I heard someone...

What is the most practical and cost efficient way to make a 10m3 gas bag for the storage of hydrogen? I am thinking of storing H2 from water electrolysis in an outdoor area, a bit like the way biodigestor gas is stored in low cost, small scale installations. My concern is the high effusing...

blu ray disc has a shorter wavelength than a red laser (650nm), but how does having shorter wavelength effect storage space? answer in laypersons terms.

After reading about this I'm left wondering what's next. From, http://www.bbc.com/news/science-environment-36824902 "In theory, this storage density would allow all books ever created by humans to be written on a single post stamp," said Dr Otte. As a proof of principle, the team encoded a...

Which would it be better to store (relatively) heat sensitive stuff in, if the container will be outside but in another case. I know black absorbs more heat but shiny objects _reflect_ more heat, so which would do less damage to the contents of the container? If the container is in the sun but...

Hi, I took part in discussions on various forums on viability of large-scale solar power as a primary energy source (on Earth), and on in-situ resource utilization (ISRU) for space missions. One idea discussed for Mars base was to produce CO and LOX from Mars CO2 atmosphere, obviating the need...

It can be depressing to reject so many ideas for power generation or bulk storage of energy. That makes it refreshing to read today's news about a new method that IMO sounds 100% credible in their claims, and that has a potential scalability that could far exceed pumped hydro...

How large would a superconducting magnetic energy storage device be if it were to safely carry 100 kilowatt-hours of energy? How much cryogen (liquid nitrogen) would it consume per hour if the device were made from high-temperature superconducting materials (YBCO or similar).

Hello PF, I am a middle school teacher in Humboldt county, CA and teach physical science to eighth graders. We are beginning our electricity and magnetism unit and have students have experimented with making a light bulb illuminate using a battery and copper wire. My question is, if we make a...

Hi, I'm doing a high school physics project and am trying to figure out if a certain setup that I'm using is adiabatic or isothermal, in order to determine what equation I can use to calculate the work that my setup does-- the threads I've come across so far only explain the difference, but not...

Hi, So is there a type of battery or ANYTHING that stores electric charge or potential that is purely real and does not look reactive in a circuit? Cheers

I have to model a storage vessel in ansys and perform stress analysis for it. I have no idea about which element types I will need for the analysis. I have calculated the design dimensions for the vessel. I am a beginner at ansys and know only how to deal with simple structural and thermal...

I am trying to determine the weight capacity of a steel storage shelf i am making. The shelf will be 119in long with a 10in upright every 37in. The shelf will be made out of 2x2x1/4 HSS. In order tod etermine how much it can hold, do i determine how much each 10in column can support with a force...

Why do we want to know how much a charge can be stored per volt? What has the voltage to do with the storage of charge in a capacitor?

I am trying to figure out the efficiency of a reversible hydraulic generator/pump station that will generate electricity when the price is high, and pump water up into the reservouar with power from the grid when electricity is cheap. I have calculated the following information for the pump and...

Hi, What is in general the most cost-effective way of the CCS technologies: Post,pre or oxyfuel combustion?

There are claims or at least assumptions that: "upon approaching "critical point" pure gases become super compressible. You could compress them many times without pressure increase and store like this if you maintain exact temperature and pressure needed. It opens possibility to superdense gas...

Recent threads started discussing the Tesla batteries. It forked into consumer and utility applications. https://translate.google.com/translate?sl=ja&tl=en&u=http%3A//www.mitsubishielectric.co.jp/news/2015/pdf/0622-b.pdf is news of a 50 MW. 300 MWh battery to be installed with a solar...

Hello, I have to design a high inertia flywheel for energy storage. The flywheel must be something like in the drawing I attached. The question is: how can I calculate the Inertia and the stored kinetic energy in this type of flywheel? Can I consider it like a classic "Rim , hub and spokes"...

Homework Statement A water storage tank is open to air on the top and has a height of 1 m. If the tank is completely full and a hole is made at the center of the wall of the tank, how fast will water exit the tank? Homework Equations Pressure is the same as atmospheric pressure because the...

I have seen a lot of effort go into finding cheap, safe, high energy density phase change materials to store energy in the form of heat so power produced during the daytime may be delivered at night time. But I have an issue with storing energy in phase change materials. They rely on chemicals...

I was reading this article about different types of energy storage, and it gave this formula for compressed air. Joules = P0V0ln(P/P0) Where P0 = Atmospheric pressure 105 Pa V0 = Volume of air to be compressed in m3. P = Pressure in tank when compressed in Pa. Note: This formula is for...

Storing energy in a system means to raise the internal energy of it. A system could be in superconducting phase because the latter has correspondingly lower internal energy. How can energy be stored in a phase that has the lower energy? When energy is injected into the system, it would leave...

Any ideas about how to get normal size rechargeable batteries that would last longer than 1 year (at least 3-4 years of 24h use) 5 to 15 volts I thought of http://en.wikipedia.org/wiki/Flow_battery but can they be that small and recharged fast enough ( at least a little faster than they...

1. Which memory storage is better if I want the memory to be durable? Like when I drop it or hit it and still have the least chance of corrupting its memory. 2. Which memory is better if I want to store it for centuries without rewriting the memory and then be able to access the memory without...

See attached image. I have never heard that before. Why wouldn't one be able to implement a data structure that stores a matrix by its columns using C? Is that true?

I am still in high school but my curiosity is not stopping me from posting in this forum. How is data stored in SSD? How does it differ from the old HDD? I heard that atoms are used to store data. How? Binary consists of 0 and 1. How does someone use an atom to represent 0 and 1? Does positive...

What defines how much energy we could store in some gas by compressing it to a certain volume by applying a certain pressure? The compessability coefficient? Is there some gases which allow to store more energy than air? Which gas has the largest compressibility coefficient?

I recently got heavier into cigar smoking and want to start storing cigars at home in a humidor. Like most things that become a sort of hobby of mine, I research the hell out of my new fascination. So while learning about humidors, I discovered that the cigar community is split on whether or...

I am studying renewable engineering at uni.. And found the flywheel storage interesting. I did my own research and found out that it is expensive to implement this technique. However, all the articles describe the cost as expensive, not with specific figure ($) So, I wonder what is...

Tonight I've had a deceptively simple question that I've found maddeningly difficult to get an answer to. What I'm looking for is a list of springs with information on how much they can be compressed and how much energy they store. E.g.: Steel spring from company A has dimensions X, Y, Z and...

Hello to all Experts in Adsorption Physics! Here is a research paper, stating that water adsorbed in a mineral called bentonite can store as much as 30 kJ/g. According our research and findings with such water based latent heat or phase change storage systems, there seem to be a fatal error...

Homework Statement [/b][/B] a Storage tank at STP contains 18,5kg of nitrogen (N2). a) What is the volume of the tank? b) What is the pressure if an additional 15.kg of nitrogen is added without changing the temperature. Homework Equations n= m/molar mass P= nRT/V The Attempt at...

So, in the context of computing for the even avid techy, it seems like a Petabyte(1024 Terabytes) of storage on a single drive seems both out of reach, and unnecessary. I mean, on my computer, I've got 1080p (legal) downloads of movies, several very large games, and a comfortable amount of...

Article in Wikipedia states that specific energy of Superconducting magnetic energy storage is limited to 1 - 10 W·h/kg. http://en.wikipedia.org/wiki/Superconducting_magnetic_energy_storage Do I understand it correct that the larger will be radius of SMES ring the less problem with Laurence...

Homework Statement Describe and explain some of the design features of a flywheel in order for it to store maximum energy. Your answer should include consideration of the flywheel’s shape, the material from which it is made and its design for high angular speeds. Homework Equations...

Hello, I finished an experiment of finding out the track spacing of a CD and a DVD. My laser wavelength was 654nm which I used to calculate track spacing of the optical discs. I got a track spacing of a CD 1.57um which is close to a real value of 1.6um, and the track spacing of a DVD...

Energy Storage in Flywheels: I am searching for resources on couple of topics 1) Types of frictions in energy storage flywheels -aerodynamic, rotational ... etc. and 2) Motor/Generator selection for energy storage flywheels. Any links or references will be appreciated.

I work for a company which has an interesting problem. We store at cryogenic temperatures in vapour phase, not submerged in liquid. In order to protect the inner bag we place an over wrap over the inner bag then vacuum pack it, in a sterile environment. The bag is then placed into cryogenic...

When I connect the phone to the computer via USB cable, it shows that the device is connected as a media device, and when I select for other USB options only Camera(PTP) is available. But I need it to connect as USB storage so I can test run app on my phone. I have tried turning the USB...