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Integral Solution of Two-Region Solid–Liquid Phase Change in Annular Geometries and Application to Phase Change Materials–Air Heat Exchangers

Author

Listed:
  • Hamidreza Shabgard

    (School of Aerospace and Mechanical Engineering, University of Oklahoma, 865 Asp Ave., Norman, OK 73019, USA)

  • Weiwei Zhu

    (School of Aerospace and Mechanical Engineering, University of Oklahoma, 865 Asp Ave., Norman, OK 73019, USA)

  • Amir Faghri

    (Department of Mechanical Engineering, University of Connecticut, 191 Auditorium Road, Storrs, CT 06269-3139, USA)

Abstract

A mathematical model based on the integral method is developed to solve the problem of conduction-controlled solid–liquid phase change in annular geometries with temperature gradients in both phases. The inner and outer boundaries of the annulus were subject to convective, constant temperature or adiabatic boundary conditions. The developed model was validated by comparison with control volume-based computational results using the temperature-transforming phase change model, and an excellent agreement was achieved. The model was used to conduct parametric studies on the effect of annuli geometry, thermophysical properties of the phase change materials (PCM), and thermal boundary conditions on the dynamics of phase change. For an initially liquid PCM, it was found that increasing the radii ratio increased the total solidification time. Also, increasing the Biot number at the cooled (heated) boundary and Stefan number of the solid (liquid) PCM, decreased (increased) the solidification time and resulted in a greater (smaller) solid volume fraction at steady state. The application of the developed method was demonstrated by design and analysis of a PCM–air heat exchanger for HVAC systems. The model can also be easily employed for design and optimization of annular PCM systems for all associated applications in a fraction of time needed for computational simulations.

Suggested Citation

  • Hamidreza Shabgard & Weiwei Zhu & Amir Faghri, 2019. "Integral Solution of Two-Region Solid–Liquid Phase Change in Annular Geometries and Application to Phase Change Materials–Air Heat Exchangers," Energies, MDPI, vol. 12(23), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4474-:d:290420
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    References listed on IDEAS

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    1. Xue Chen & Xiaolei Li & Xinlin Xia & Chuang Sun & Rongqiang Liu, 2019. "Thermal Performance of a PCM-Based Thermal Energy Storage with Metal Foam Enhancement," Energies, MDPI, vol. 12(17), pages 1-18, August.
    2. Tian, Y. & Zhao, C.Y., 2011. "A numerical investigation of heat transfer in phase change materials (PCMs) embedded in porous metals," Energy, Elsevier, vol. 36(9), pages 5539-5546.
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    Cited by:

    1. Túlio Nascimento Porto & João M. P. Q. Delgado & Ana Sofia Guimarães & Hortência Luma Fernandes Magalhães & Gicelia Moreira & Balbina Brito Correia & Tony Freire de Andrade & Antonio Gilson Barbosa de, 2020. "Phase Change Material Melting Process in a Thermal Energy Storage System for Applications in Buildings," Energies, MDPI, vol. 13(12), pages 1-32, June.

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