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Analogy Analysis of Height Exergy and Temperature Exergy in Energy Storage System

Author

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  • Yan Cui

    (School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China)

  • Tong Jiang

    (School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China)

  • Mulin Liu

    (School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China)

Abstract

As a pivotal technology and infrastructure component for modern power systems, energy storage has experienced significant advancement in recent years. A fundamental prerequisite for designing future energy storage facilities lies in the systematic evaluation of energy conversion capabilities across diverse storage technologies. This study conducted a comparative analysis between pumped hydroelectric storage (PHS) and compressed air energy storage (CAES), defining the concepts of height exergy and temperature exergy. Height exergy is the maximum work capacity of a liquid due to height differences, while temperature exergy is the maximum work capacity of a gas due to temperature differences. The temperature exergy represents innovation in thermodynamic analysis; it is derived from internal exergy and proven through the Maxwell relation and the decoupling method of internal exergy, offering a more efficient method for calculating energy storage capacity in CAES systems. Mathematical models of height exergy and temperature exergy were established based on their respective forms. A unified calculation formula was derived, and their respective characteristics were analyzed. In order to show the meaning of temperature exergy more clearly and intuitively, a height exergy model of temperature exergy was established through analogy analysis, and it was concluded that the shape of the reservoir was a cone when comparing water volume to heat quantity, intuitively showing that the cold source had a higher energy storage density than the heat source. Finally, a typical hybrid PHS–CAES system was proposed, and a mathematical model was established and verified in specific cases based on height exergy and temperature exergy. It was demonstrated that when the polytropic exponent n = 1.2, the theoretical loss accounted for the largest proportion, which was 2.06%.

Suggested Citation

  • Yan Cui & Tong Jiang & Mulin Liu, 2025. "Analogy Analysis of Height Exergy and Temperature Exergy in Energy Storage System," Energies, MDPI, vol. 18(14), pages 1-19, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:14:p:3675-:d:1699610
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    References listed on IDEAS

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