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1. (WO2018078062) ENERGY STORAGE DEVICE AND METHOD FOR STORING ENERGY

Pub. No.:    WO/2018/078062    International Application No.:    PCT/EP2017/077533
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Fri Oct 27 01:59:59 CEST 2017
IPC: F01K 3/00
F01K 3/06
F01K 25/00
Applicants: ORTMANN, Peter
GRAF, Werner
Inventors: ORTMANN, Peter
GRAF, Werner
Title: ENERGY STORAGE DEVICE AND METHOD FOR STORING ENERGY
Abstract:
The energy storage device (1) for storing energy comprises: a high-temperature regenerator (120) containing a solid, particularly porous storage material (S); a working gas (A) as the heat transfer medium to transfer heat between the storage material (S) and the working gas (A) flowing through; and a charging circuit (100) and a discharging circuit (200) for the working gas (A). The charging circuit (100) is designed such that starting from a pre-heating unit (151) at least one first heat transfer duct of a recuperator (130), a first compressor (HO), the high-temperature regenerator (120), a second heat transfer duct of the recuperator (130) and then a first expander (140) are interconnected, thus forming a circuit, so as to conduct fluid. The first compressor (110) is coupled with the first expander (140), and the first compressor (110) forms part of a first piston machine (K1) and the first expander (140) forms part of a second piston machine (K2), said piston machines (K1, K2) being actuatably operable either as a compressor or as an expander such that the first compressor (110) of the charging circuit (100) forms a second expander (250) in the discharging circuit (200) and that the first expander (140) of the charging circuit (100) forms a second compressor (210) in the discharging circuit (200). The high-temperature regenerator (120) can be operatively connected to either the charging circuit (100) or the discharging circuit (200) so as to conduct fluid and can be controlled such that the high-temperature regenerator (120), the compressor and the expander form either part of the charging circuit (100) or part of the discharging circuit (200). The charging circuit (100), the discharging circuit (200) and the high-temperature regenerator (120) have the same working gas (A) so that the working gas (A) comes into direct contact with the storage material of the high-temperature regenerator (120) both in the charging circuit (100) and in the discharging circuit (200).