Supercritical CO2 Heat Pumps and Power Cycles for Concentrating Solar Power: Paper No. 090006

Joshua McTigue, Pau Farres-Antunez, Ty Neises, Alexander White

Research output: Contribution to conferencePaper

1 Scopus Citations

Abstract

Pumped Thermal Energy Storage (PTES) is a promising technology for electricity storage applications. An electrically driven heat pump moves energy from a cold space to a hot space, thereby creating hot and cold thermal storage. The temperature difference between the hot and cold storage is later used to drive a heat engine and return electricity to the grid. In this article, supercritical carbon dioxide (sCO2) is chosen as the working fluid for PTES, and results are compared to 'conventional' systems that use nitrogen. Molten salts are used for the hot storage which means that a CSP plant with thermal storage and an sCO2 power cycle could potentially be hybridized with PTES by the addition of a heat pump. This article describes some of the benefits of this combined system which can provide renewable power generation and energy management services. Two methods by which an sCO2 heat pump can be combined with an sCO2 power cycle for CSP are described and techno-economic results are presented. Results indicate that these systems can achieve reasonable technical performance, but that costs are currently high.
Original languageAmerican English
Number of pages10
DOIs
StatePublished - 2022
EventSOLARPACES 2020: 26th International Conference on Concentrating Solar Power and Chemical Energy Systems - Freiburg, Germany
Duration: 28 Sep 20202 Oct 2020

Conference

ConferenceSOLARPACES 2020: 26th International Conference on Concentrating Solar Power and Chemical Energy Systems
CityFreiburg, Germany
Period28/09/202/10/20

Bibliographical note

See NREL/CP-5700-77955 for preprint

NREL Publication Number

  • NREL/CP-5700-83285

Keywords

  • carnot battery
  • concentrating solar power
  • pumped thermal energy storage
  • supercritical carbon dioxide
  • thermal energy storage

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