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Mathematical Modelling and Operational Analysis of Combined Vertical–Horizontal Heat Exchanger for Shallow Geothermal Energy Application in Cooling Mode

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  • Sarwo Edhy Sofyan

    (Department of Mechanical Engineering, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia)

  • Eric Hu

    (School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia)

  • Andrei Kotousov

    (School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia)

  • Teuku Meurah Indra Riayatsyah

    (Department of Mechanical Engineering, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia)

  • Razali Thaib

    (Department of Mechanical Engineering, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia)

Abstract

Geothermal heat exchangers (GHEs) represent a buried pipe system, which can be utilised to harness renewable thermal energy stored in the ground to improve the efficiency of heating and cooling systems. Two basic arrangements of GHEs have been widely used: vertical and horizontal. Vertical GHEs generally have a better performance in comparison with the horizontal arrangement, and these systems are particularly suitable for confined spaces. Nevertheless, the main technical challenge associated with GHEs, for either the vertical or the horizontal arrangement, is the performance deterioration associated with an increase in the operation times during summer or winter seasons. In this paper, a combined horizontal-vertical GHE arrangement is proposed to address the current challenges. The combined GHE arrangement can be operated in five different modes, corresponding to different thermal loading conditions. These five operation modes of the combined GHE are analysed based on the transient finite difference models previously developed for the horizontal and vertical arrangements. The simulation results reveal that for the single operation mode (horizontal or vertical only), the vertical GHE performs better than the horizontal GHE due to relatively stable ground temperature deep down. While, for the combined operation mode, the series operations (horizontal to vertical or vertical to horizontal) of the GHE are superior to the split mode. It is found that the effect of the fluid mass flow rate ratio is trivial on the heat dissipation of the split mode GHE. The highest heat transfer rate in the split flow operational mode is rendered by the ratio of the mass flow rate of 40% horizontal and 60% vertical. In addition, the climate condition has more effect on GHE’s performance and the increase of the fluid flow rate it can enhance the amount of energy released by the GHE.

Suggested Citation

  • Sarwo Edhy Sofyan & Eric Hu & Andrei Kotousov & Teuku Meurah Indra Riayatsyah & Razali Thaib, 2020. "Mathematical Modelling and Operational Analysis of Combined Vertical–Horizontal Heat Exchanger for Shallow Geothermal Energy Application in Cooling Mode," Energies, MDPI, vol. 13(24), pages 1-20, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6598-:d:461978
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    References listed on IDEAS

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    Cited by:

    1. T. M. Indra Mahlia & I. M. Rizwanul Fattah, 2021. "Energy for Sustainable Future," Energies, MDPI, vol. 14(23), pages 1-2, November.
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