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A Numerical Parametric Study of a Double-Pipe LHTES Unit with PCM Encapsulated in the Annular Space

Author

Listed:
  • Evdoxia Paroutoglou

    (Department of Energy Performance, Indoor Environment and Sustainability of Buildings, Aalborg University, 2450 København, Denmark)

  • Peter Fojan

    (Department of Materials and Production, Aalborg University, 9220 Aalborg, Denmark)

  • Leonid Gurevich

    (Department of Materials and Production, Aalborg University, 9220 Aalborg, Denmark)

  • Simon Furbo

    (Department of Civil and Mechanical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark)

  • Jianhua Fan

    (Department of Civil and Mechanical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark)

  • Marc Medrano

    (Department of Computing and Industrial Engineering, University of Lleida, 1300 Lleida, Spain)

  • Alireza Afshari

    (Department of Energy Performance, Indoor Environment and Sustainability of Buildings, Aalborg University, 2450 København, Denmark)

Abstract

Latent heat thermal energy storage (LHTES) with Phase Change Materials (PCM) represents an interesting option for Thermal Energy Storage (TES) applications in a wide temperature range. A tubular encapsulation model of an LHTES with PCM was developed, and the calculated data were analyzed. In addition, a parametric analysis for the preferable system geometry is presented. Organic paraffin RT18 with a melting point of 18 °C was utilized as PCM for different geometries of LHTES, and the addition of internal and external fins and their influence on LHTES thermal conductivity was investigated. One-step heat exchange from outdoor air to PCM and from PCM to water characterizes the LHTES system in solidification and melting processes, respectively. A 2D axisymmetric model was developed using Comsol Multiphysics 6.0. The LHTES unit performance with PCM organic paraffin RT18 encapsulated in electrospun fiber matrices was analyzed. The study results show that longer internal fins shorten the melting and solidification time. Direct contact of PCM electrospun fiber matrix with 23 °C water showed instant melting, and the phase change process was accelerated by 99.97% in the discharging cycle.

Suggested Citation

  • Evdoxia Paroutoglou & Peter Fojan & Leonid Gurevich & Simon Furbo & Jianhua Fan & Marc Medrano & Alireza Afshari, 2022. "A Numerical Parametric Study of a Double-Pipe LHTES Unit with PCM Encapsulated in the Annular Space," Sustainability, MDPI, vol. 14(20), pages 1-16, October.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:20:p:13317-:d:944206
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    References listed on IDEAS

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