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The Influence of the Shape of Granite on the Heat Storage Process in a Rock Bed

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  • Magdalena Nemś

    (Department of Thermodynamics and Renewable Energy Sources, Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland)

  • Artur Nemś

    (Department of Thermodynamics and Renewable Energy Sources, Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland)

  • Kamila Gębarowska

    (Department of Thermodynamics and Renewable Energy Sources, Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland)

Abstract

Granite is one of those materials that due to its thermal parameters is used as a filling for storage beds, including high-temperature ones. The article analyzes local material that was extracted in Strzegom, Poland. The purpose of the paper is the assessment of storage material with regard to its cooperation with a heat source that is available for a short time, e.g., a solar installation. Three different shapes of granite material were tested: rock, cube and sphere. Each shape has its advantages and disadvantages, which are associated with economic and strength aspects. The article presents experimental tests of the material, which were conducted in order to determine the efficiency of the charging process. The results show that rock-shaped granite filling elements are characterized with the best parameters during the charging process, and that they obtained the highest first- and second-law efficiency in the entire tested range of inlet air temperature and flow rate. The efficiency of the cube-shaped granite was lower than the sphere-shaped granite. This means that the efficiency does not directly depend on the coefficient of sphericity of the elements that fill the storage bed. The determination of the second law efficiency showed that the highest use of energy supplied with hot air occurs after 1 h of charging the accumulator in the case of all the analyzed geometries. At the end of the paper, the influence of the obtained results on the process of modelling the charging of a storage bed filled with elements of non-spherical geometry is also discussed.

Suggested Citation

  • Magdalena Nemś & Artur Nemś & Kamila Gębarowska, 2020. "The Influence of the Shape of Granite on the Heat Storage Process in a Rock Bed," Energies, MDPI, vol. 13(21), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5662-:d:436760
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    References listed on IDEAS

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    1. Zanganeh, G. & Pedretti, A. & Haselbacher, A. & Steinfeld, A., 2015. "Design of packed bed thermal energy storage systems for high-temperature industrial process heat," Applied Energy, Elsevier, vol. 137(C), pages 812-822.
    2. Ioan Sarbu & Calin Sebarchievici, 2018. "A Comprehensive Review of Thermal Energy Storage," Sustainability, MDPI, vol. 10(1), pages 1-32, January.
    3. Singh, Harmeet & Saini, R.P. & Saini, J.S., 2010. "A review on packed bed solar energy storage systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(3), pages 1059-1069, April.
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    Cited by:

    1. Magdalena Nemś, 2020. "Experimental Determination of the Influence of Shape on the Heat Transfer Process in a Crushed Granite Storage Bed," Energies, MDPI, vol. 13(24), pages 1-16, December.
    2. Daniarta, Sindu & Nemś, Magdalena & Kolasiński, Piotr, 2023. "A review on thermal energy storage applicable for low- and medium-temperature organic Rankine cycle," Energy, Elsevier, vol. 278(PA).

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