A hydrogen release and storage system (100) of the present invention includes a first hydrogen release and storage unit (100A) composed of a first hydrogen compound member (101A), a first container (102A) that accommodates the first hydrogen compound member (101A), a first heating apparatus (103A) configured to heat an inside of the first container (102A), a first cooling apparatus (104A) configured to cool the inside of the first container (102A), a first water supply apparatus (105A) configured to supply water to the first container (102A), a second hydrogen release and storage unit (100B) composed of a second hydrogen compound member (101B), a second container (102B) that accommodates the second hydrogen compound member (101B), a second heating apparatus (103B) configured to heat an inside of the second container (102B), a second cooling apparatus (104B) configured to cool the inside of the second container (102B) and a second water supply apparatus (105B) configured to supply water to the second container (102B).

A hydrogen release and storage system (100) of the present invention includes a first hydrogen release and storage unit (100A) composed of a first hydrogen compound member (101A), a first container (102A) that accommodates the first hydrogen compound member (101A), a first heating apparatus (103A) configured to heat an inside of the first container (102A), a first cooling apparatus (104A) configured to cool the inside of the first container (102A), a first water supply apparatus (105A) configured to supply water to the first container (102A), a second hydrogen release and storage unit (100B) composed of a second hydrogen compound member (101B), a second container (102B) that accommodates the second hydrogen compound member (101B), a second heating apparatus (103B) configured to heat an inside of the second container (102B), a second cooling apparatus (104B) configured to cool the inside of the second container (102B) and a second water supply apparatus (105B) configured to supply water to the second container (102B).

An energy storage plant includes a casing for the storage of a working fluid other than atmospheric air, in a gaseous phase and in equilibrium of pressure with the atmosphere; a tank for the storage of said working fluid in a liquid or supercritical phase with a temperature close to the critical temperature; wherein said critical temperature is close to the ambient temperature. The plant is configured to carry out a closed thermodynamic cyclic transformation, first in one direction in a charge configuration and then in the opposite direction in a discharge configuration, between said casing and said tank; wherein in the charge configuration the plant stores heat and pressure and in the discharge configuration generates energy.

An energy storage plant includes a casing for the storage of a working fluid other than atmospheric air, in a gaseous phase and in equilibrium of pressure with the atmosphere; a tank for the storage of said working fluid in a liquid or supercritical phase with a temperature close to the critical temperature; wherein said critical temperature is close to the ambient temperature. The plant is configured to carry out a closed thermodynamic cyclic transformation, first in one direction in a charge configuration and then in the opposite direction in a discharge configuration, between said casing and said tank; wherein in the charge configuration the plant stores heat and pressure and in the discharge configuration generates energy.

Pumped heat energy storage systems that can be used to store and extract electrical energy. A motor/generator system is releasably coupled and decoupled via clutches from a charge mode powertrain and a generation mode powertrain depending on the operating mode of the pumped heat energy storage system.

Pumped heat energy storage systems that can be used to store and extract electrical energy. A motor/generator system is releasably coupled and decoupled via clutches from a charge mode powertrain and a generation mode powertrain depending on the operating mode of the pumped heat energy storage system.

The invention relates to a system and a method for storing electrical energy which are based on a closed thermodynamic cycle. They make it possible to store electrical energy in a very efficient, cost-effective, and safe manner. No environmentally hazardous or expensive materials are required. The system comprises a compressor, a turbine, and two packed-bed storage units which are operated at different temperature levels. In order to load the packed-bed storage units, the cycle is operated as a counterclockwise heat pump process. In this process, the heat generated at the outlet of the compressor is expanded at a high temperature level into a first packed-bed storage unit and stored therein. The “cold” produced during the subsequent expansion of the gaseous working medium in a turbine is stored in a second packed-bed storage unit. This requires mechanical energy which is provided by an electrical machine. In order to discharge the energy storage system, the cycle is operated in reverse (i.e., as a clockwise cycle). Before entering the compressor, the working medium is cooled with the cold stored in the second packed-bed storage unit and, after compression, absorbs the heat from the high-temperature packed-bed storage system. The hot working medium at high pressure is expanded by means of the turbine and thus energy is generated.

The invention relates to a system and a method for storing electrical energy which are based on a closed thermodynamic cycle. They make it possible to store electrical energy in a very efficient, cost-effective, and safe manner. No environmentally hazardous or expensive materials are required. The system comprises a compressor, a turbine, and two packed-bed storage units which are operated at different temperature levels. In order to load the packed-bed storage units, the cycle is operated as a counterclockwise heat pump process. In this process, the heat generated at the outlet of the compressor is expanded at a high temperature level into a first packed-bed storage unit and stored therein. The “cold” produced during the subsequent expansion of the gaseous working medium in a turbine is stored in a second packed-bed storage unit. This requires mechanical energy which is provided by an electrical machine. In order to discharge the energy storage system, the cycle is operated in reverse (i.e., as a clockwise cycle). Before entering the compressor, the working medium is cooled with the cold stored in the second packed-bed storage unit and, after compression, absorbs the heat from the high-temperature packed-bed storage system. The hot working medium at high pressure is expanded by means of the turbine and thus energy is generated.

An energy storage plant includes a casing for the storage of a working fluid different from atmospheric air, in gaseous phase and in pressure equilibrium with the atmosphere; and a tank for the storage of said working fluid in liquid or super-critical phase with a temperature close to the critical temperature. The critical temperature is close to the ambient temperature. The plant is configured to perform a closed cyclic thermodynamic transformation, first in one direction in a charge configuration and then in an opposite direction in a discharge configuration, between said casing and said tank. In the charge configuration the plant stores heat and pressure and in the discharge configuration generates mechanical energy to drive a driven machine.

An energy storage plant includes a casing for the storage of a working fluid different from atmospheric air, in gaseous phase and in pressure equilibrium with the atmosphere; and a tank for the storage of said working fluid in liquid or super-critical phase with a temperature close to the critical temperature. The critical temperature is close to the ambient temperature. The plant is configured to perform a closed cyclic thermodynamic transformation, first in one direction in a charge configuration and then in an opposite direction in a discharge configuration, between said casing and said tank. In the charge configuration the plant stores heat and pressure and in the discharge configuration generates mechanical energy to drive a driven machine.