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Thermodynamic analysis of a novel energy storage system based on compressed CO2 fluid

Zhang, Xin‐Rong ; Wang, Guan‐Bang

International journal of energy research, 2017-08, Vol.41 (10), p.1487-1503 [Periódico revisado por pares]

Bognor Regis: Hindawi Limited

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  • Título:
    Thermodynamic analysis of a novel energy storage system based on compressed CO2 fluid
  • Autor: Zhang, Xin‐Rong ; Wang, Guan‐Bang
  • Assuntos: Analysis ; Brayton cycle ; Capacity ; Carbon dioxide ; Carbon sequestration ; Compressed air ; compressed CO2 energy storage ; Density ; Efficiency ; Energy ; Energy management ; Energy storage ; Exergy ; Flux density ; Heat ; Heat storage ; Hot water ; Optimization ; Parameter sensitivity ; Power efficiency ; Reliability ; Sensitivity analysis ; Stability ; Storage systems ; thermodynamic analysis ; Thermodynamics
  • É parte de: International journal of energy research, 2017-08, Vol.41 (10), p.1487-1503
  • Descrição: Summary Because of rapidly growing renewable power capacity, energy storage system is in urgent need to cope with the reliability and stability challenges. CO2 has already been selected as the working fluid, including thermo‐electrical energy storage or electrothermal energy storage systems and compressed CO2 energy storage (CCES) systems. In this paper, a CCES system based on Brayton cycle with hot water as the heat storage medium is proposed and analyzed. Thermodynamic model of the system is established for energy and exergy analysis. Sensitivity analysis is then conducted to reveal effects of different parameters on system performances and pursue optimization potential. At a typical transcritical operation condition, round trip efficiency is 60% with energy density of 2.6 kWh/m3. And for the typical supercritical operation condition, the round trip efficiency can reach 71% with energy density of 23 kWh/m3. High round trip efficiency and energy density, which is comparable with those of compressed air energy storage systems, thermo‐electrical energy storage (electrothermal energy storage) systems, and other CCES systems, lead to promising prospect of the proposed system. Copyright © 2017 John Wiley & Sons, Ltd. In this paper, a Brayton cycle‐based compressed CO2 energy storage system under both transcritical and supercritical operation conditions is proposed and analyzed. This system is independent on fossil fuels and other extra heat source as well as geographical conditions and only requires the heat storage with water as the medium. According to the analyses, the proposed system has comparable round trip efficiency and energy density to those of compressed air energy storage systems, thermo‐electrical energy storage (electrothermal energy storage) systems, and other compressed CO2 energy storage systems.
  • Editor: Bognor Regis: Hindawi Limited
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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