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Influence of local geological data on the performance of horizontal ground-coupled heat pump system integrated with building thermal loads

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  • Han, Chanjuan
  • Ellett, Kevin M.
  • Naylor, Shawn
  • Yu, Xiong (Bill)

Abstract

Horizontal ground-couple heat pump (GCHP) system incurs lower installation cost compared with the vertical GCHP system. However, the shallow burial depth makes the heat transfer process susceptible to seasonal variations. This paper analyzes the short-term and annual performance of different geothermal heat exchangers’ (GHEs) configurations and geological conditions by developing 3D finite element models. Field monitored data of ground temperature and thermal property are incorporated. Six common types of GHE configurations are analyzed, from which the most efficient patterns are identified. The annual performance of optimal GCHP pattern integrated with different types of building loads are analyzed. Major conclusions include (1) application of soil temperature harmonic function as commonly done in the current practice will lead to overestimation of thermal build-up effects underground; (2) utilization of local geological data (i.e., field measured ground temperature and soil thermal properties) helps improve the annual performance of horizontal GCHP system; (3) shift of ground temperature is less significant for GCHP operating in heating dominant areas due to balanced heat injection and extraction. This study indicates incorporating local geological data reduce the GHE design length by 25%–60% and therefore is a viable strategy to achieve cost effectiveness.

Suggested Citation

  • Han, Chanjuan & Ellett, Kevin M. & Naylor, Shawn & Yu, Xiong (Bill), 2017. "Influence of local geological data on the performance of horizontal ground-coupled heat pump system integrated with building thermal loads," Renewable Energy, Elsevier, vol. 113(C), pages 1046-1055.
    • Handle: RePEc:eee:renene:v:113:y:2017:i:c:p:1046-1055
    DOI: 10.1016/j.renene.2017.06.025
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    References listed on IDEAS

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    1. Han, Chanjuan & Yu, Xiong (Bill), 2016. "Sensitivity analysis of a vertical geothermal heat pump system," Applied Energy, Elsevier, vol. 170(C), pages 148-160.
    2. Kim, Eui-Jong & Bernier, Michel & Cauret, Odile & Roux, Jean-Jacques, 2014. "A hybrid reduced model for borehole heat exchangers over different time-scales and regions," Energy, Elsevier, vol. 77(C), pages 318-326.
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    8. Buonomano, Annamaria & Calise, Francesco & Palombo, Adolfo & Vicidomini, Maria, 2015. "Energy and economic analysis of geothermal–solar trigeneration systems: A case study for a hotel building in Ischia," Applied Energy, Elsevier, vol. 138(C), pages 224-241.
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    Cited by:

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    2. 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.
    3. Tsagarakis, Konstantinos P., 2020. "Shallow geothermal energy under the microscope: Social, economic, and institutional aspects," Renewable Energy, Elsevier, vol. 147(P2), pages 2801-2808.
    4. 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.
    5. Eloisa Di Sipio & David Bertermann, 2017. "Factors Influencing the Thermal Efficiency of Horizontal Ground Heat Exchangers," Energies, MDPI, vol. 10(11), pages 1-21, November.

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