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New global thermal numerical model of vertical U-tube ground heat exchanger

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  • Chwieduk, Michal

Abstract

This paper presents a new numerical model of the vertical U-tube ground heat exchanger (GHE). Objective of creating the new model was to obtain more accurate, detailed and reasonably fast simulation of the GHE system, which guarantees proper sizing of such a system during design process. Different approaches for modelling GHE are described with emphasis on the new thermal resistance model (TRM) of an U-tube GHE. The 1D model of the heat transfer between working fluid of a GHE and the borehole is applied. This model was coupled with a 3D model of heat transfer in the ground surrounding the GHE. The global model of a ground heat source system is obtained by connecting segments representing volume of ground influenced by each of the GHE. The paper describes a discretization scheme, coupling method, boundary conditions and limitation of the proposed model. The simulation results and the measured in-situ data from literature are compared, it differ by 3% taking into account the heat extracted from the ground. Simulation results of heat extracted from the ground, working fluid temperature and ground temperature distributions around GHE are presented. Conclusions concerning obtained results shows possible use for simulation of the operation of GHE.

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  • Chwieduk, Michal, 2021. "New global thermal numerical model of vertical U-tube ground heat exchanger," Renewable Energy, Elsevier, vol. 168(C), pages 343-352.
    • Handle: RePEc:eee:renene:v:168:y:2021:i:c:p:343-352
    DOI: 10.1016/j.renene.2020.12.069
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    References listed on IDEAS

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    1. Florides, Georgios & Kalogirou, Soteris, 2007. "Ground heat exchangers—A review of systems, models and applications," Renewable Energy, Elsevier, vol. 32(15), pages 2461-2478.
    2. Jaworski, Maciej & Łapka, Piotr & Furmański, Piotr, 2014. "Numerical modelling and experimental studies of thermal behaviour of building integrated thermal energy storage unit in a form of a ceiling panel," Applied Energy, Elsevier, vol. 113(C), pages 548-557.
    3. Sivasakthivel, T. & Philippe, Mikael & Murugesan, K. & Verma, Vikas & Hu, Pingfang, 2017. "Experimental thermal performance analysis of ground heat exchangers for space heating and cooling applications," Renewable Energy, Elsevier, vol. 113(C), pages 1168-1181.
    4. Chwieduk, Dorota, 1996. "Analysis of utilisation of renewable energies as heat sources for heat pumps in building sector in Poland," Renewable Energy, Elsevier, vol. 9(1), pages 720-723.
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    Cited by:

    1. Jia, Linrui & Lu, Lin & Chen, Jianheng & Han, Jie, 2022. "A novel radiative sky cooling-assisted ground-coupled heat exchanger system to improve thermal and energy efficiency for buildings in hot and humid regions," Applied Energy, Elsevier, vol. 322(C).
    2. Ma, Yuanyuan & Li, Shibin & Zhang, Ligang & Liu, Songze & Wang, Ming, 2023. "Heat extraction performance evaluation of U-shaped well geothermal production system under different well-layout parameters and engineering schemes," Renewable Energy, Elsevier, vol. 203(C), pages 473-484.
    3. Shen, Junhao & Zhou, Chaohui & Luo, Yongqiang & Tian, Zhiyong & Zhang, Shicong & Fan, Jianhua & Ling, Zhang, 2023. "Comprehensive thermal performance analysis and optimization study on U-type deep borehole ground source heat pump systems based on a new analytical model," Energy, Elsevier, vol. 274(C).
    4. Davide Menegazzo & Giulia Lombardo & Sergio Bobbo & Michele De Carli & Laura Fedele, 2022. "State of the Art, Perspective and Obstacles of Ground-Source Heat Pump Technology in the European Building Sector: A Review," Energies, MDPI, vol. 15(7), pages 1-25, April.

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