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The Development of a Transient Analysis Platform of Near-Critical CO 2 Thermodynamic Systems via an Enthalpy-Based Implicit Continuous Eulerian Approach

Author

Listed:
  • Seongmin Son

    (Department of Convergence and Fusion System Engineering, Kyungpook National University, Sangju 37224, Republic of Korea)

  • Seong Jun Bae

    (Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea)

Abstract

This work presents the development and validation of an enthalpy-based implicit continuous Eulerian (ICE) solver, termed the near-critical ICE solver (NICES), for the analysis of near-critical CO 2 thermodynamic systems. Traditional approaches relying on pressure and temperature as main inputs for the analysis have limitations in handling CO 2 near the critical point, which exhibits unique characteristics and frequent phase changes. To overcome these limitations, this study proposes using enthalpy as a more suitable mathematical modeling approach. The NICES methodology employs the homogeneous equilibrium model and the Span and Wagner equations of state for CO 2 . This solver demonstrates improved numerical stability and computational speed compared to explicit calculation methods, as validated by frictionless heated pipe scenarios involving phase transitions near the critical point. The enthalpy-based NICES platform can predict thermohydraulics, including multiphase flows, without requiring specialized two-phase flow models.

Suggested Citation

  • Seongmin Son & Seong Jun Bae, 2024. "The Development of a Transient Analysis Platform of Near-Critical CO 2 Thermodynamic Systems via an Enthalpy-Based Implicit Continuous Eulerian Approach," Energies, MDPI, vol. 17(5), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1126-:d:1346836
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    References listed on IDEAS

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    1. Sun, Enhui & Ji, Hongfu & Wang, Xiangren & Ma, Wenjing & Zhang, Lei & Xu, Jinliang, 2023. "Proposal of multistage mass storage process to approach isothermal heat rejection of semi-closed S–CO2 cycle," Energy, Elsevier, vol. 270(C).
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