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Numerical study of horizontal ground heat exchangers for design optimization

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  • Selamat, Salsuwanda
  • Miyara, Akio
  • Kariya, Keishi

Abstract

Despite ground source heat pump has been proven as highly efficient, high initial cost discourages homeowners and small-medium enterprises to opt for such systems. Horizontal ground heat exchangers offer relatively low-cost solution that may help promoting these systems usage worldwide. This study examines ways to optimize the designs for horizontal ground heat exchangers by using different layouts and pipe materials. CFD simulation of three dimensional models was performed to achieve this objective. All cases tested are able to yield comparable heat exchange rate for an equal trench length. However, the effective period differs one from the other. Additional initial and overhead costs are worthy as slinky ground heat exchangers prolongs heat transfer process when compared against straight configuration. Pipe materials with superior thermal conductivity also promote longer high efficiency operation. An improvement of 16% is reported when copper pipe is used instead of the conventional HDPE pipes. Effective period can be extended by 14% when ground heat exchangers are installed in vertical orientation. Thermal interference in slinky configuration is prevalent during initial operation. In a long run, the effect is observed to be minimal except in vertical orientation. However, it is avoidable beforehand at design stage.

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  • Selamat, Salsuwanda & Miyara, Akio & Kariya, Keishi, 2016. "Numerical study of horizontal ground heat exchangers for design optimization," Renewable Energy, Elsevier, vol. 95(C), pages 561-573.
    • Handle: RePEc:eee:renene:v:95:y:2016:i:c:p:561-573
    DOI: 10.1016/j.renene.2016.04.042
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    1. Md. Hasan Ali & Keishi Kariya & Akio Miyara, 2017. "Performance Analysis of Slinky Horizontal Ground Heat Exchangers for a Ground Source Heat Pump System," Resources, MDPI, vol. 6(4), pages 1-18, October.
    2. 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.
    3. Tang, Fujiao & Nowamooz, Hossein, 2020. "Outlet temperatures of a slinky-type Horizontal Ground Heat Exchanger with the atmosphere-soil interaction," Renewable Energy, Elsevier, vol. 146(C), pages 705-718.
    4. Dehghan B, Babak, 2018. "Thermal conductivity determination of ground by new modified two dimensional analytical models: Study cases," Renewable Energy, Elsevier, vol. 118(C), pages 393-401.
    5. Zhang, Guozhu & Cao, Ziming & Xiao, Suguang & Guo, Yimu & Li, Chenglin, 2022. "A promising technology of cold energy storage using phase change materials to cool tunnels with geothermal hazards," Renewable and Sustainable Energy Reviews, Elsevier, vol. 163(C).
    6. Chengbin Zhang & Weibo Yang & Jingjing Yang & Suchen Wu & Yongping Chen, 2017. "Experimental Investigations and Numerical Simulation of Thermal Performance of a Horizontal Slinky-Coil Ground Heat Exchanger," Sustainability, MDPI, vol. 9(8), pages 1-22, August.
    7. Jing, Zefeng & Wang, Huaijiu & Feng, Chenchen & Wang, Shuzhong, 2020. "Numerical study on the heat characteristics of a novel artificial seepage thermal storage based on the successive four seasons," Renewable Energy, Elsevier, vol. 160(C), pages 1185-1193.
    8. Kwonye Kim & Jaemin Kim & Yujin Nam & Euyjoon Lee & Eunchul Kang & Evgueniy Entchev, 2021. "Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment," Energies, MDPI, vol. 14(7), pages 1-13, March.
    9. Jun-Seo Jeon & Seung-Rae Lee & Min-Jun Kim & Seok Yoon, 2018. "Suggestion of a Scale Factor to Design Spiral-Coil-Type Horizontal Ground Heat Exchangers," Energies, MDPI, vol. 11(10), pages 1-16, October.
    10. Mirzanamadi, Raheb & Hagentoft, Carl-Eric & Johansson, Pär, 2020. "Coupling a Hydronic Heating Pavement to a Horizontal Ground Heat Exchanger for harvesting solar energy and heating road surfaces," Renewable Energy, Elsevier, vol. 147(P1), pages 447-463.
    11. Hou, Gaoyang & Taherian, Hessam & Song, Ying & Jiang, Wei & Chen, Diyi, 2022. "A systematic review on optimal analysis of horizontal heat exchangers in ground source heat pump systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 154(C).
    12. Yang, Weibo & Xu, Rui & Wang, Feng & Chen, Shikun, 2020. "Experimental and numerical investigations on the thermal performance of a horizontal spiral-coil ground heat exchanger," Renewable Energy, Elsevier, vol. 147(P1), pages 979-995.
    13. Adriana Greco & Claudia Masselli, 2020. "The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study," Energies, MDPI, vol. 13(23), pages 1-25, December.
    14. Ľubomíra Gabániová & Dušan Kudelas & Martin Prčík, 2021. "Modelling Ground Collectors and Determination of the Influence of Technical Parameters, Installation and Geometry on the Soil," Energies, MDPI, vol. 14(21), pages 1-21, November.
    15. Jeon, Jun-Seo & Lee, Seung-Rae & Kim, Min-Jun, 2018. "A modified mathematical model for spiral coil-type horizontal ground heat exchangers," Energy, Elsevier, vol. 152(C), pages 732-743.
    16. Bryś, Krystyna & Bryś, Tadeusz & Sayegh, Marderos Ara & Ojrzyńska, Hanna, 2020. "Characteristics of heat fluxes in subsurface shallow depth soil layer as a renewable thermal source for ground coupled heat pumps," Renewable Energy, Elsevier, vol. 146(C), pages 1846-1866.
    17. Jaemin Kim & Yujin Nam, 2020. "Development of the Performance Prediction Equation for a Modular Ground Heat Exchanger," Energies, MDPI, vol. 13(22), pages 1-13, November.
    18. Luka Boban & Dino Miše & Stjepan Herceg & Vladimir Soldo, 2021. "Application and Design Aspects of Ground Heat Exchangers," Energies, MDPI, vol. 14(8), pages 1-31, April.

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