Energy storage

An accumulator is an apparatus by means of which energy can be stored, such as a rechargeable battery or a hydraulic accumulator. Such devices may be electrical, fluidic or mechanical and are sometimes used to convert a small continuous power source into a short surge of energy or vice versa. Other examples of accumulators include capacitors, compulsators, wave energy machines, pumped-storage hydroelectric plants. ...more on Wikipedia about "Accumulator (energy)"

A capacitor is a device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed. A capacitor is occasionally referred to using the older term condenser. ...more on Wikipedia about "Capacitor"

A compulsator is the short name for a compensated pulsed alternator, a form of power supply. ...more on Wikipedia about "Compulsator"

Energy density is the amount of potential energy stored in a given system or region of space per unit volume. ...more on Wikipedia about "Energy density"

Energy storage is the storing of some form of energy that can be drawn upon at a later time to perform some useful operation. ...more on Wikipedia about "Energy storage"

* Flywheels - index at PESWiki.com ...more on Wikipedia about "Flywheel"

Flywheel Energy Storage (FES) works by accelerating a rotor to a very high speed and maintaining the energy in the system as inertial energy. Commercially available FES systems are used for small uninterruptible power systems. The rotors normally operate at 4000 RPM or less and are made of metal. Advanced flywheels are made of high strength carbon-composite filaments that spin at speeds from 20,000-100,000 RPM in a vacuum enclosure. Magnetic bearings are necessary as speeds increase to reduce friction found in conventional mechanical bearings. Quick charging is done in less than 15 minutes. Long lifetimes of most flywheels, plus high energy (~ 130 Wh/kg) and high power are positive attributes. The round trip energy efficiency of flywheels can be as high as 80%. Since FES can store and release power quickly, they have found a niche providing pulsed power. ...more on Wikipedia about "Flywheel energy storage" Go crack a http://www.shortopedia.com! shortopedia

Grid energy storage is the use of various energy storage techniques to complement electric power generation plants on the transmission grid. Demand for electricity from the world's various grids varies over the course of the day and from season to season. For the most part, variation in electric demand is met by varying the amount of electrical energy supplied from primary sources, usually hydroelectric dams and gas-fired turbines. Increasingly, however, operators are storing marginally cheap energy produced at night, then releasing it to the grid during the day when it is more expensive. ...more on Wikipedia about "Grid energy storage"

A hydraulic accumulator is an energy storage device. It is a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure by an external source. That external source can be a spring, a raised weight, or a compressed gas. The main reasons that an accumulator is used in a hydraulic system are so that the pump doesn't need to be so large to cope with extremes of demand, so that the supply circuit can respond more quickly to any temporary demand and to smooth pulsations. ...more on Wikipedia about "Hydraulic accumulator"

Hydroelectricity is electricity obtained from hydropower. Most hydroelectric power comes from the potential energy of dammed water driving a water turbine and generator. Less common variations make use of water's kinetic energy or undammed sources such as tidal power. Hydroelectricity is a renewable energy source. ...more on Wikipedia about "Hydroelectricity"

A liquid nitrogen (LN2) economy is a hypthetical proposal for a future economy in which the primary form of energy storage and transport is liquid nitrogen. It is proposed as an alternative to liquid hydrogen in some transport modes and as a means of locally storing energy captured from renewable sources. An analysis of this concept provides insight into the physical limits of all energy conversion schemes. ...more on Wikipedia about "Liquid nitrogen economy"

Pumped storage hydroelectricity is a method of storing and producing electricity to supply high peak demands by moving water between reservoirs at different elevations. ...more on Wikipedia about "Pumped-storage hydroelectricity"

Superconducting Magnetic Energy Storage (SMES) systems store energy in the magnetic field created by the flow of direct current in a superconducting coil which has been cryogenically cooled to a temperature below its superconducting critical temperature. ...more on Wikipedia about "Superconducting magnetic energy storage"

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