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Determination of Thermocline Heat Transfer Coefficient by Using CFD Simulation

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  • Arkadiusz Szczęśniak

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska Street, 00-665 Warsaw, Poland)

  • Jarosław Milewski

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska Street, 00-665 Warsaw, Poland)

  • Olaf Dybiński

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska Street, 00-665 Warsaw, Poland)

  • Kamil Futyma

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska Street, 00-665 Warsaw, Poland)

  • Jakub Skibiński

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska Street, 00-665 Warsaw, Poland)

  • Aliaksandr Martsinchyk

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska Street, 00-665 Warsaw, Poland)

  • Łukasz Szabłowski

    (Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska Street, 00-665 Warsaw, Poland)

Abstract

This article deals with a thermal energy storage system in the form of a water tank with a thermocline. The well-known thermocline phenomenon is modeled using computational fluid dynamics (CFD). However, the reservoir model proposed in this article is zero-dimensional. This is due to the fact that the aim of this article is to build a mathematical model that will be more useful in mathematical models of complex energy systems in which a hot water tank is one of many elements of the system. In such a zero-dimensional mathematical model, the hot water tank will be modeled using equations describing heat transfer, and the thermocline itself will be treated as a heat transfer surface with known dimensions and heat transfer coefficient. A novelty of this paper is that it addresses heat loss across the thermocline as defined in this manner. A CFD model of a thermal storage tank is created, validated with available experimental data, and used to obtain the heat transfer coefficient U. The resulting value is then analyzed quantitatively and qualitatively and the changes in the thickness of the thermocline are accounted for in the equation. The results from this groundbreaking work can be used to analyze heat storage in the form of thermocline water tanks at the level of system modeling, e.g., for the purpose of configuring the structure of other devices and control systems.

Suggested Citation

  • Arkadiusz Szczęśniak & Jarosław Milewski & Olaf Dybiński & Kamil Futyma & Jakub Skibiński & Aliaksandr Martsinchyk & Łukasz Szabłowski, 2023. "Determination of Thermocline Heat Transfer Coefficient by Using CFD Simulation," Energies, MDPI, vol. 16(7), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3150-:d:1112349
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    References listed on IDEAS

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    1. Szczęśniak, Arkadiusz & Milewski, Jarosław & Dybiński, Olaf & Futyma, Kamil & Skibiński, Jakub & Martsinchyk, Aliaksandr, 2023. "Dynamic simulation of a four tank 200 m3 seasonal thermal energy storage system oriented to air conditioning at a dietary supplements factory," Energy, Elsevier, vol. 264(C).
    2. Jóźwiak, Piotr & Hercog, Jarosław & Kiedrzyńska, Aleksandra & Badyda, Krzysztof, 2019. "CFD analysis of natural gas substitution with syngas in the industrial furnaces," Energy, Elsevier, vol. 179(C), pages 593-602.
    3. Lago, Jesus & De Ridder, Fjo & Mazairac, Wiet & De Schutter, Bart, 2019. "A 1-dimensional continuous and smooth model for thermally stratified storage tanks including mixing and buoyancy," Applied Energy, Elsevier, vol. 248(C), pages 640-655.
    4. Chandra, Yogender Pal & Matuska, Tomas, 2020. "Numerical prediction of the stratification performance in domestic hot water storage tanks," Renewable Energy, Elsevier, vol. 154(C), pages 1165-1179.
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    Cited by:

    1. Lihua Cao & Jingwen Yu & Xifeng Liu & Zhanzhou Wang, 2024. "Evaluation Method and Analysis on Performance of Diffuser in Heat Storage Tank," Energies, MDPI, vol. 17(3), pages 1-15, January.

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