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Modeling of a two-phase CO2-filled vertical borehole for geothermal heat pump applications

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  • Eslami-Nejad, Parham
  • Ouzzane, Mohamed
  • Aidoun, Zine

Abstract

A numerical model has been developed to study the complex thermal behavior of a CO2-filled vertical geothermal borehole consisting of a long copper U-tube embedded in a solid material (grout). The model accounts for combinations of single-phase and two-phase fluid flow which may occur along the U-tube length. An explicit solution for fully coupled steady-state conservation equations of mass, momentum and energy is applied. The borehole is divided into small volume elements due to relatively significant changes in the thermophysical properties of the fluid. Borehole wall temperature variations as well as thermal interaction between tube sections are taken into account and the model predicts the fluid temperature, pressure and two-phase quality profiles.

Suggested Citation

  • Eslami-Nejad, Parham & Ouzzane, Mohamed & Aidoun, Zine, 2014. "Modeling of a two-phase CO2-filled vertical borehole for geothermal heat pump applications," Applied Energy, Elsevier, vol. 114(C), pages 611-620.
    • Handle: RePEc:eee:appene:v:114:y:2014:i:c:p:611-620
    DOI: 10.1016/j.apenergy.2013.10.028
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    References listed on IDEAS

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    1. Eslami-nejad, Parham & Bernier, Michel, 2012. "Freezing of geothermal borehole surroundings: A numerical and experimental assessment with applications," Applied Energy, Elsevier, vol. 98(C), pages 333-345.
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    4. Yang, H. & Cui, P. & Fang, Z., 2010. "Vertical-borehole ground-coupled heat pumps: A review of models and systems," Applied Energy, Elsevier, vol. 87(1), pages 16-27, January.
    5. Yang, Weibo & Shi, Mingheng & Liu, Guangyuan & Chen, Zhenqian, 2009. "A two-region simulation model of vertical U-tube ground heat exchanger and its experimental verification," Applied Energy, Elsevier, vol. 86(10), pages 2005-2012, October.
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    Cited by:

    1. Ndiaye, Demba, 2016. "Reliability and performance of direct-expansion ground-coupled heat pump systems: Issues and possible solutions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 66(C), pages 802-814.
    2. Nguyen, A. & Elsami-Nejad, P., 2019. "A transient coupled model of a variable speed transcritical CO2 direct expansion ground source heat pump for space heating and cooling," Renewable Energy, Elsevier, vol. 140(C), pages 1012-1021.
    3. Javadi, Hossein & Mousavi Ajarostaghi, Seyed Soheil & Rosen, Marc A. & Pourfallah, Mohsen, 2019. "Performance of ground heat exchangers: A comprehensive review of recent advances," Energy, Elsevier, vol. 178(C), pages 207-233.
    4. Hakkaki-Fard, Ali & Eslami-Nejad, Parham & Aidoun, Zine & Ouzzane, Mohamed, 2015. "A techno-economic comparison of a direct expansion ground-source and an air-source heat pump system in Canadian cold climates," Energy, Elsevier, vol. 87(C), pages 49-59.
    5. Parham Eslami-Nejad & Messaoud Badache & Arash Bastani & Zine Aidoun, 2018. "Detailed Theoretical Characterization of a Transcritical CO 2 Direct Expansion Ground Source Heat Pump Water Heater," Energies, MDPI, vol. 11(2), pages 1-16, February.
    6. Rajib Uddin Rony & Huojun Yang & Sumathy Krishnan & Jongchul Song, 2019. "Recent Advances in Transcritical CO 2 (R744) Heat Pump System: A Review," Energies, MDPI, vol. 12(3), pages 1-35, January.
    7. Cimmino, Massimo, 2016. "Fluid and borehole wall temperature profiles in vertical geothermal boreholes with multiple U-tubes," Renewable Energy, Elsevier, vol. 96(PA), pages 137-147.
    8. Moya, Diego & Aldás, Clay & Kaparaju, Prasad, 2018. "Geothermal energy: Power plant technology and direct heat applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 889-901.

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    Keywords

    Geothermal; Borehole; CO2; Two-phase; Heat pump; Modeling;
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