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A 1D Reduced-Order Model (ROM) for a Novel Latent Thermal Energy Storage System

Author

Listed:
  • Gargi Kailkhura

    (Advanced Heat Exchangers and Process Intensification (AHXPI) Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA)

  • Raphael Kahat Mandel

    (Advanced Heat Exchangers and Process Intensification (AHXPI) Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA)

  • Amir Shooshtari

    (Advanced Heat Exchangers and Process Intensification (AHXPI) Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA)

  • Michael Ohadi

    (Advanced Heat Exchangers and Process Intensification (AHXPI) Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA)

Abstract

Phase change material (PCM)-based thermal energy storage (TES) systems are widely used for repeated intermittent heating and cooling applications. However, such systems typically face some challenges due to the low thermal conductivity and expensive encapsulation process of PCMs. The present study overcomes these challenges by proposing a lightweight, low-cost, and low thermal resistance TES system that realizes a fluid-to-PCM additively manufactured metal-polymer composite heat exchanger (HX), based on our previously developed cross-media approach. A robust and simplified, analytical-based, 1D reduced-order model (ROM) was developed to compute the TES system performance, saving computational time compared to modeling the entire TES system using PCM-related transient CFD modeling. The TES model was reduced to a segment-level model comprising a single PCM-wire cylindrical domain based on the tube-bank geometry formed by the metal fin-wires. A detailed study on the geometric behavior of the cylindrical domain and the effect of overlapped areas, where the overlapped areas represent a deviation from 1D assumption on the TES performance, was conducted. An optimum geometric range of wire-spacings and size was identified. The 1D ROM assumes 1D radial conduction inside the PCM and analytically computes latent energy stored in the single PCM-wire cylindrical domain using thermal resistance and energy conservation principles. The latent energy is then time-integrated for the entire TES, making the 1D ROM computationally efficient. The 1D ROM neglects sensible thermal capacity and is thus applicable for the low Stefan number applications in the present study. The performance parameters of the 1D ROM were then validated with a 2D axisymmetric model, typically used in the literature, using commercially available CFD tools. For validation, a parametric study of a wide range of non-dimensionalized parameters, depending on applications ranging from pulsed-power cooling to peak-load shifting for building cooling application, is included in this paper. The 1D ROM appears to correlate well with the 2D axisymmetric model to within 10%, except at some extreme ranges of a few of the non-dimensional parameters, which lead to the condition of axial conduction inside the PCM, deviating from the 1D ROM.

Suggested Citation

  • Gargi Kailkhura & Raphael Kahat Mandel & Amir Shooshtari & Michael Ohadi, 2022. "A 1D Reduced-Order Model (ROM) for a Novel Latent Thermal Energy Storage System," Energies, MDPI, vol. 15(14), pages 1-30, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5124-:d:862682
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    References listed on IDEAS

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    1. Milián, Yanio E. & Gutiérrez, Andrea & Grágeda, Mario & Ushak, Svetlana, 2017. "A review on encapsulation techniques for inorganic phase change materials and the influence on their thermophysical properties," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 983-999.
    2. Gargi Kailkhura & Raphael Kahat Mandel & Amir Shooshtari & Michael Ohadi, 2022. "Numerical and Experimental Study of a Novel Additively Manufactured Metal-Polymer Composite Heat-Exchanger for Liquid Cooling Electronics," Energies, MDPI, vol. 15(2), pages 1-22, January.
    3. Zauner, Christoph & Hengstberger, Florian & Etzel, Mark & Lager, Daniel & Hofmann, Rene & Walter, Heimo, 2016. "Experimental characterization and simulation of a fin-tube latent heat storage using high density polyethylene as PCM," Applied Energy, Elsevier, vol. 179(C), pages 237-246.
    4. Yue Hu & Rui Guo & Per Kvols Heiselberg & Hicham Johra, 2020. "Modeling PCM Phase Change Temperature and Hysteresis in Ventilation Cooling and Heating Applications," Energies, MDPI, vol. 13(23), pages 1-21, December.
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