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Modeling and assessment of the efficiency of horizontal and vertical ground heat exchangers

Author

Listed:
  • Florides, G.
  • Theofanous, E.
  • Iosif-Stylianou, I.
  • Tassou, S.
  • Christodoulides, P.
  • Zomeni, Z.
  • Tsiolakis, E.
  • Kalogirou, S.
  • Messaritis, V.
  • Pouloupatis, P.
  • Panayiotou, G.

Abstract

This paper describes the mathematical modeling of vertical and horizontal GHEs (ground heat exchangers) and compares their efficiency. The model used calculates the heat flow in the fluid, tubes, grout and ground. The vertical U-tube GHE is represented by two 100 m lines, embedded in four different types of ground with an additional bottom base. The horizontal GHE consists of four 50 m tube lines embedded in three ground layers. The initial ground temperature for all cases examined matches real data acquired in June at a location in Cyprus and the simulation results for the vertical GHE are validated using measured data showing very good agreement. Further simulations with the vertical GHE show that when the initial ground temperature rises, the mean temperature of the GHE fluid increases proportionally. Comparisons between horizontal and vertical GHEs reveal that under the same operating conditions and center-to-center distances of the tubes, the vertical GHE keeps a much lower mean temperature. Simulations for a horizontal GHE, for a 50-h of continuous operation period and 24 °C initial ground temperature, show that the mean fluid temperature can remain lower than that of the vertical GHE if the center-to-center distance of the tubes increases to 1 m.

Suggested Citation

  • Florides, G. & Theofanous, E. & Iosif-Stylianou, I. & Tassou, S. & Christodoulides, P. & Zomeni, Z. & Tsiolakis, E. & Kalogirou, S. & Messaritis, V. & Pouloupatis, P. & Panayiotou, G., 2013. "Modeling and assessment of the efficiency of horizontal and vertical ground heat exchangers," Energy, Elsevier, vol. 58(C), pages 655-663.
    • Handle: RePEc:eee:energy:v:58:y:2013:i:c:p:655-663
    DOI: 10.1016/j.energy.2013.05.053
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    References listed on IDEAS

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    3. Stylianou, Iosifina Iosif & Florides, Georgios & Tassou, Savvas & Tsiolakis, Efthymios & Christodoulides, Paul, 2017. "Methodology for estimating the ground heat absorption rate of Ground Heat Exchangers," Energy, Elsevier, vol. 127(C), pages 258-270.
    4. 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).
    5. Go, Gyu-Hyun & Lee, Seung-Rae & N.V., Nikhil & Yoon, Seok, 2015. "A new performance evaluation algorithm for horizontal GCHPs (ground coupled heat pump systems) that considers rainfall infiltration," Energy, Elsevier, vol. 83(C), pages 766-777.
    6. 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.
    7. Barbaresi, A. & Maioli, V. & Bovo, M. & Tinti, F. & Torreggiani, D. & Tassinari, P., 2020. "Application of basket geothermal heat exchangers for sustainable greenhouse cultivation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 129(C).
    8. Farzaneh-Gord, Mahmood & Ghezelbash, Reza & Sadi, Meisam & Moghadam, Ali Jabari, 2016. "Integration of vertical ground-coupled heat pump into a conventional natural gas pressure drop station: Energy, economic and CO2 emission assessment," Energy, Elsevier, vol. 112(C), pages 998-1014.
    9. Ana Vieira & Maria Alberdi-Pagola & Paul Christodoulides & Saqib Javed & Fleur Loveridge & Frederic Nguyen & Francesco Cecinato & João Maranha & Georgios Florides & Iulia Prodan & Gust Van Lysebetten , 2017. "Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications," Energies, MDPI, vol. 10(12), pages 1-51, December.
    10. 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.
    11. 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.
    12. Somogyi, Viola & Sebestyén, Viktor & Nagy, Georgina, 2017. "Scientific achievements and regulation of shallow geothermal systems in six European countries – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P2), pages 934-952.
    13. Sofyan, Sarwo Edhy & Hu, Eric & Kotousov, Andrei, 2016. "A new approach to modelling of a horizontal geo-heat exchanger with an internal source term," Applied Energy, Elsevier, vol. 164(C), pages 963-971.
    14. Jin, Guang & Li, Zheng & Guo, Shaopeng & Wu, Xuan & Wu, Wenfei & Zhang, Kai, 2020. "Thermal performance analysis of multiple borehole heat exchangers in multilayer geotechnical media," Energy, Elsevier, vol. 209(C).

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