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Exergy and Thermoeconomic Analyses of a Carnot Battery System Comprising an Air Heat Pump and Steam Turbine

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  • Kum-Jung Lee

    (Program in Science and Technology Studies (STS), Korea University, Seoul 02841, Republic of Korea
    Korea Institute of Energy Technology Evaluation and Planning (KETEP), Seoul 06175, Republic of Korea)

  • Seok-Ho Seo

    (Blue Economy Strategy Institute Co., Ltd., 150 Dogok-ro, Gangnam-gu, Seoul 06260, Republic of Korea)

  • Junhyun Cho

    (Thermal Energy Conversion Systems Laboratory, Korea Institute of Energy Research, Daejeon 34129, Republic of Korea)

  • Si-Doek Oh

    (Blue Economy Strategy Institute Co., Ltd., 150 Dogok-ro, Gangnam-gu, Seoul 06260, Republic of Korea)

  • Sang-Ok Choi

    (Program in Science and Technology Studies (STS), Korea University, Seoul 02841, Republic of Korea)

  • Ho-Young Kwak

    (Blue Economy Strategy Institute Co., Ltd., 150 Dogok-ro, Gangnam-gu, Seoul 06260, Republic of Korea
    Mechanical Engineering Department, Chung-Ang University, Seoul 06974, Republic of Korea)

Abstract

In this study, exergy and thermoeconomic analyses were performed on a Carnot battery system (CBS) comprising an air heat pump and steam turbine. The Carnot battery technology employed in this study stored electricity as heat for 10 h during night-time, when electricity prices were low, and generated electricity for 10 h with power output of 500 MW during the day, when electricity prices were relatively high. The roundtrip efficiency and the energy density of the CBS were approximately 0.37, and 150.0 MJ/m 3 , respectively. When the unit cost of electricity supplied to the heat pump system was approximately 23.0 USD/GJ, that of electricity produced by the steam turbine was approximately 70.8 USD/GJ. The thermoeconomic results indicate that the changes in electricity cost flow rate relative to the reference value can be used as an indicator to make purchasing, replacement, and research and development decisions for specific components of the CBS.

Suggested Citation

  • Kum-Jung Lee & Seok-Ho Seo & Junhyun Cho & Si-Doek Oh & Sang-Ok Choi & Ho-Young Kwak, 2022. "Exergy and Thermoeconomic Analyses of a Carnot Battery System Comprising an Air Heat Pump and Steam Turbine," Energies, MDPI, vol. 15(22), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8672-:d:977231
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    References listed on IDEAS

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