METHOD FOR CHARGING AND DISCHARGING A HEAT ACCUMULATOR AND PLANT FOR STORING AND RELEASING THERMAL ENERGY, SUITABLE FOR THIS METHOD

摘要

A method for charging and discharging a heat accumulator is provided. A system by which the method can be performed is also provided. By means of the heat accumulator, it is possible to convert overcapacities of wind turbines, for example, into a charging circuit as heat in the accumulator by a compressor. If necessary, electricity can be stored into the network by a turbine and a generator, wherein the heat accumulator is discharged. The charging circuit and the discharging circuit are operated by a Rankine cycle, wherein for example river water is available as a reservoir for heat exchangers in order to cause evaporation of the working medium in the charging circuit and condensation of the working medium in the discharging circuit.

主权项

1. A method for charging and discharging a heat accumulator, comprising:
during a charging cycle the heat accumulator is heated by means of a working fluid, wherein before passing through the heat accumulator a pressure increase is created in the working fluid by means of a first thermal fluid energy machine which is operated as a working machine, and after passing through the heat accumulator the working fluid is expanded and during a discharging cycle the heat accumulator is cooled by means of a working fluid, wherein before passing through the heat accumulator a pressure increase is created in the working fluid and after passing through the heat accumulator the working fluid is expanded via a second thermal fluid energy machine which is operated as a power machine, or via the first thermal fluid energy machine which is operated as a power machine,
wherein both the charging cycle and the discharging cycle are designed as a Rankine process in which the working fluid is evaporated during the charging cycle via a first heat exchanger and is condensed during the discharging cycle via the first or a second heat exchanger,
wherein the first heat exchanger, and if the second heat exchanger is present, the second heat exchanger also, create a temperature balance with the environment.