Abstract:
The invention relates to a method for storing electric energy, having the steps of a) generating methane from water and soot using electric energy, b) storing the methane, and c) splitting the methane into hydrogen and soot, said hydrogen being used to generate energy, or generating energy by converting the methane into soot and water in a cyclic bromination/oxidation process. The soot accumulated during the methane splitting process or during the cyclic bromination/oxidation process according to step c) is collected and used in step a) when restarting the method for generating methane such that a closed carbon circuit is produced. The invention also relates to a system comprising a current/methane conversion system, in which an electric current together with soot and water is converted into methane, and to a methane/current conversion system, in which methane is converted into hydrogen while splitting soot.
Abstract:
Different types of energy storage systems are described, in particular hydro-pneumatic storage systems. In one, energy is stored by compressing gas in a chamber (44,45,54,55) with a liquid piston and released by gas expansion. A spray head or grid at the top of the chamber (44,45,54,55) supplies liquid as a shower through the gas being compressed or expanding in the cylinder (11,12) to maintain an isothermal condition. In another, energy is stored from an array of solar cells connected to an array of supercapacitors forming an auxiliary storage, and a main energy storage device such as a hydro-pneumatic storage system, for supply to an AC or DC network. The efficiency is improved by connecting the solar cells via the array of supercapacitors to the AC or DC network. An immersed hydro-pneumatic storage device for off-shore/on-shore power generation systems comprises a cylinder that is immersed in a liquid mass, wherein energy is stored by compressing gas with a liquid piston and energy is released by gas expansion. The mass of liquid maintains an isothermal condition in the cylinder during compression and expansion.
Abstract:
A power supply and control system for electrically powered shuttle-trains incorporates at least one shuttle train having a motor and a generator. A first plurality of track segments has associated synchronous power modules exchanging power synchronously with a power grid through a plurality of power supply rail segments connectable to the motor or generator. A second plurality of track segments has associated variable frequency power modules exchanging power through a second plurality of power supply rail segments connectable to the motor or generator. Isolation segments separate adjacent power supply rail segments. A control system interconnected to the variable frequency power modules controls the frequency of each variable frequency power module based on the location of the shuttle train.
Abstract:
Various methods, apparatuses and systems are directed to battery-charging applications. As may be consistent with one or more embodiments discussed herein, a charging current for charging a battery is modulated, and the frequency of the modulated charging current is set based upon an impedance of the battery. Temperature of the battery is estimated based upon the impedance exhibited by the battery, while the battery is charged with the modulated charging current. In various implementations, the battery charging rate is controlled based on the estimated temperature.
Abstract:
Die Erfindung betrifft eine Vorrichtung zur Erzeugung von Druckluft oder anderen unter Druck stehenden Gasen, mit mindestens einem Hochdruckverdichter (12) und einem Niederdruckverdichter (11) und insbesondere einem nachgeordneten Gasspeicher (Behälter 13). Erfindungsgemäß ist der Hochdruckverdichter eine Turbomaschine mit verstellbaren Leitschaufeln und wird wechselweise in der einen Richtung als Kompressor und in der anderen Richtung als Expansionsmaschine durchströmt.