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Brayton batteries for combined electricity and heat and cooling production: Systematic concept study

Krüger, Michael (2023) Brayton batteries for combined electricity and heat and cooling production: Systematic concept study. International Renewable Energy Storage and Systems Conference (IRES 2023), 2023-11-28 - 2023-11-30, Aachen, Deutschland.

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Abstract

Carnot batteries are considered a promising technology to contribute to the implementation of the energy transition in the power sector because of their potentially very high power-to-power efficiency. However, with regard to Brayton batteries, the gap between theoretically and realistically achievable efficiency is quite high. This has several causes, especially on the part of the required turbomachinery. On the one hand, the maximum achievable compressor discharge temperatures are limited to 400-500 °C on the machine side, and their significant increase requires intensive development efforts. Secondly, the isentropic efficiencies of the turbomachinery are high at 80 to 90 % for large units, but not 100 %. As a result, a considerable amount of energy is converted into heat during both the charging and discharging cycles, which cannot be fully utilized in the electricity generation alone. On the conceptual side, in addition to an advantageous topology and parameter selection, optimization of energy efficiency is also required. The latter can be achieved in particular by extending the benefits of the plant beyond pure electricity generation to other purposes: Electricity generation with heat integration as well as coupled generation of electricity/heat, electricity/cold, electricity/heat/cold, electricity/heat with heat integration, and electricity/cold with heat integration. For these different purposes, the paper presents a concept study in which all theoretically possible integration points for the necessary heat exchangers for the input or output of heat into the plant are systematically investigated by system simulations. This is carried out with a universal model created in the simulation software Ebsilon Professional, which is able to cover all theoretically possible topologies with regard to heat exchanger integration. As a result, out of hundred thousands of possible concepts for Brayton batteries, those are found that are physically possible and have the highest degree of efficiency or utilization.

Item URL in elib:https://elib.dlr.de/200944/
Document Type:Conference or Workshop Item (Speech)
Title:Brayton batteries for combined electricity and heat and cooling production: Systematic concept study
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Krüger, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-2187-8678UNSPECIFIED
Date:30 November 2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Carnot-Battery; Brayton-Battery; TES
Event Title:International Renewable Energy Storage and Systems Conference (IRES 2023)
Event Location:Aachen, Deutschland
Event Type:international Conference
Event Start Date:28 November 2023
Event End Date:30 November 2023
Organizer:EUROSOLAR European Association for Renewable Energy
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Krüger, Michael
Deposited On:18 Dec 2023 17:53
Last Modified:24 Apr 2024 21:01

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