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Fluid flow and heat transfer in PCM panels arranged vertically and horizontally for application in heating systems

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  • Prieto, M.M.
  • González, B.

Abstract

The rectangular panel is within the most common geometries in phase change materials (PCM). Nevertheless, there is a lack of knowledge regarding how the arrangement (vertical or horizontal) and thickness affect heat flux and phase change duration. Such knowledge would be very helpful both in the design of PCM heat exchangers. This paper studies the behavior of the RT60 paraffin, Pr ≈ 330, phase change temperature between 53 and 61 °C; and the fatty acid Palmitic Acid, Pr ≈ 110, phase change temperature of 65 °C. Parametric studies analyzing the influence of: temperature of the walls (5 × 105 < Ra ≤ 2 × 106), phase change processes (melting and solidification), panel position and PCM thickness (aspect ratio1/20 and 3/20) are performed. The flow behavior is analyzed over time using velocity plots and volumetric liquid fraction contours. The formation of Bénard cells and their evolution is described. Free convection dependence of dimensionless string function and Rayleigh number is discussed. Free convection during melting for horizontal panels becomes very important and the mean heat fluxes increase up to twofold compared to vertical panels. For solidification, however, conduction becomes more relevant. The importance of both mechanisms is highlighted by calculating heat transfer rates.

Suggested Citation

  • Prieto, M.M. & González, B., 2016. "Fluid flow and heat transfer in PCM panels arranged vertically and horizontally for application in heating systems," Renewable Energy, Elsevier, vol. 97(C), pages 331-343.
  • Handle: RePEc:eee:renene:v:97:y:2016:i:c:p:331-343
    DOI: 10.1016/j.renene.2016.05.089
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    References listed on IDEAS

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    2. Ji, Chenzhen & Qin, Zhen & Dubey, Swapnil & Choo, Fook Hoong & Duan, Fei, 2017. "Three-dimensional transient numerical study on latent heat thermal storage for waste heat recovery from a low temperature gas flow," Applied Energy, Elsevier, vol. 205(C), pages 1-12.
    3. Zheng, Zhang-Jing & Xu, Yang & Li, Ming-Jia, 2018. "Eccentricity optimization of a horizontal shell-and-tube latent-heat thermal energy storage unit based on melting and melting-solidifying performance," Applied Energy, Elsevier, vol. 220(C), pages 447-454.
    4. Abdulmunem, Abdulmunem R. & Mohd Samin, Pakharuddin & Abdul Rahman, Hasimah & Hussien, Hashim A. & Izmi Mazali, Izhari & Ghazali, Habibah, 2021. "Numerical and experimental analysis of the tilt angle’s effects on the characteristics of the melting process of PCM-based as PV cell’s backside heat sink," Renewable Energy, Elsevier, vol. 173(C), pages 520-530.
    5. Amin Ebrahimi & Chris R. Kleijn & Ian M. Richardson, 2019. "Sensitivity of Numerical Predictions to the Permeability Coefficient in Simulations of Melting and Solidification Using the Enthalpy-Porosity Method," Energies, MDPI, vol. 12(22), pages 1-18, November.

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