Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle

As a part of the change towards a higher usage of renewable energy sources, which naturally deliver the energy intermittently, the need for energy storage systems is increasing. For the compensation of the disturbance in power production due to inter-day to seasonal weather changes, a long-term ener...

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Autores principales:	Karin Rindt, František Hrdlička, Václav Novotný
Formato:	article
Lenguaje:	EN
Publicado:	CTU Central Library 2021
Materias:	pumped thermal energy storage (ptes) carnot-battery power-to-heat-to-power (p2h2p) supercritical co2 cycle brayton cycle heat exchange pinch-point analysis Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/81e6e196aeb740ddaa3d84455c43955e
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spelling	oai:doaj.org-article:81e6e196aeb740ddaa3d84455c43955e2021-11-18T13:55:36ZPreliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle1210-27091805-236310.14311/AP.2021.61.0644https://doaj.org/article/81e6e196aeb740ddaa3d84455c43955e2021-10-01T00:00:00Zhttps://ojs.cvut.cz/ojs/index.php/ap/article/view/6968https://doaj.org/toc/1210-2709https://doaj.org/toc/1805-2363As a part of the change towards a higher usage of renewable energy sources, which naturally deliver the energy intermittently, the need for energy storage systems is increasing. For the compensation of the disturbance in power production due to inter-day to seasonal weather changes, a long-term energy storage is required. In the spectrum of storage systems, one out of a few geographically independent possibilities is the use of heat to store electricity, so-called Carnot-batteries. This paper presents a Pumped Thermal Energy Storage (PTES) system based on a recuperated and recompressed supercritical CO2 Brayton cycle. It is analysed if this configuration of a Brayton cycle, which is most advantageous for supercritical CO2 Brayton cycles, can be favourably integrated into a Carnot-battery and if a similar high efficiency can be achieved, despite the constraints caused by the integration. The modelled PTES operates at a pressure ratio of 3 with a low nominal pressure of 8 MPa, in a temperature range between 16 °C and 513 °C. The modelled system provides a round-trip efficiency of 38.9 % and was designed for a maximum of 3.5 MW electric power output. The research shows that an acceptable round-trip efficiency can be achieved with a recuperated and recompressed Brayton Cycle employing supercritical CO2 as the working fluid. However, a higher efficiency would be expected to justify the complexity of the configuration.Karin RindtFrantišek HrdličkaVáclav NovotnýCTU Central Libraryarticlepumped thermal energy storage (ptes)carnot-batterypower-to-heat-to-power (p2h2p)supercritical co2 cyclebrayton cycleheat exchangepinch-point analysisEngineering (General). Civil engineering (General)TA1-2040ENActa Polytechnica, Vol 61, Iss 5, Pp 644-660 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	pumped thermal energy storage (ptes) carnot-battery power-to-heat-to-power (p2h2p) supercritical co2 cycle brayton cycle heat exchange pinch-point analysis Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	pumped thermal energy storage (ptes) carnot-battery power-to-heat-to-power (p2h2p) supercritical co2 cycle brayton cycle heat exchange pinch-point analysis Engineering (General). Civil engineering (General) TA1-2040 Karin Rindt František Hrdlička Václav Novotný Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle
description	As a part of the change towards a higher usage of renewable energy sources, which naturally deliver the energy intermittently, the need for energy storage systems is increasing. For the compensation of the disturbance in power production due to inter-day to seasonal weather changes, a long-term energy storage is required. In the spectrum of storage systems, one out of a few geographically independent possibilities is the use of heat to store electricity, so-called Carnot-batteries. This paper presents a Pumped Thermal Energy Storage (PTES) system based on a recuperated and recompressed supercritical CO2 Brayton cycle. It is analysed if this configuration of a Brayton cycle, which is most advantageous for supercritical CO2 Brayton cycles, can be favourably integrated into a Carnot-battery and if a similar high efficiency can be achieved, despite the constraints caused by the integration. The modelled PTES operates at a pressure ratio of 3 with a low nominal pressure of 8 MPa, in a temperature range between 16 °C and 513 °C. The modelled system provides a round-trip efficiency of 38.9 % and was designed for a maximum of 3.5 MW electric power output. The research shows that an acceptable round-trip efficiency can be achieved with a recuperated and recompressed Brayton Cycle employing supercritical CO2 as the working fluid. However, a higher efficiency would be expected to justify the complexity of the configuration.
format	article
author	Karin Rindt František Hrdlička Václav Novotný
author_facet	Karin Rindt František Hrdlička Václav Novotný
author_sort	Karin Rindt
title	Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle
title_short	Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle
title_full	Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle
title_fullStr	Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle
title_full_unstemmed	Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle
title_sort	preliminary prospects of a carnot-battery based on a supercritical co2 brayton cycle
publisher	CTU Central Library
publishDate	2021
url	https://doaj.org/article/81e6e196aeb740ddaa3d84455c43955e
work_keys_str_mv	AT karinrindt preliminaryprospectsofacarnotbatterybasedonasupercriticalco2braytoncycle AT frantisekhrdlicka preliminaryprospectsofacarnotbatterybasedonasupercriticalco2braytoncycle AT vaclavnovotny preliminaryprospectsofacarnotbatterybasedonasupercriticalco2braytoncycle
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Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle

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