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Long-term performance of a shallow borehole heat exchanger installed in a geothermal field of Alsace region

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  • Tang, Fujiao
  • Nowamooz, Hossein

Abstract

Seasonal hydrothermal variations on the land surface affect temperature as well suction profile in soil at shallow zones. For a Shallow Borehole Heat Exchanger (SBHE) buried not deep enough in the unsaturated soil, neglecting seasonal metrological conditions on the land surface may lead to design errors that may result in losing public's confidence. In this paper, an appropriate hydrothermal numerical analysis is used to predict seasonal hydrothermal fluctuations and SBHE performance of a site with a multi-layered soil system. The capacity of the numerical model is initially validated by the measured data from the thermal and humidity probes instrumented in a field located at Illkirch in the Alsace region (France). The results illustrate that the soil hydraulic conditions, as well as the soil thermal properties depend highly on the unsaturated soil properties in different layers. Then, the model is used to explore the performance of a SBHE installed in the same place over a year considering two different scenarios: constant inlet temperature and seasonal heat load. It has been found that the heat pump Coefficient of Performance (COP) in constant inlet temperature scenario remains almost stable during the service period. While in the case of seasonal heat load scenario, heat pump COP depends strongly on heat load and shows more variance. Eventually, the performance of the SBHE is estimated for the 5-year period considering the constant inlet temperature scenario. It has been found that the yearly Total Extracted Energy (TEE) decreases annually, while this reduction becomes less significant after the fourth year. The phenomenon illustrates that the SBHE is capable of outputting stable energy after reaching the equilibrium stage.

Suggested Citation

  • Tang, Fujiao & Nowamooz, Hossein, 2018. "Long-term performance of a shallow borehole heat exchanger installed in a geothermal field of Alsace region," Renewable Energy, Elsevier, vol. 128(PA), pages 210-222.
    • Handle: RePEc:eee:renene:v:128:y:2018:i:pa:p:210-222
    DOI: 10.1016/j.renene.2018.05.073
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    References listed on IDEAS

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    Cited by:

    1. Tang, Fujiao & Nowamooz, Hossein, 2019. "Sensitive analysis on the effective soil thermal conductivity of the Thermal Response Test considering various testing times, field conditions and U-pipe lengths," Renewable Energy, Elsevier, vol. 143(C), pages 1732-1743.
    2. 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.
    3. Tang, F. & Lahoori, M. & Nowamooz, H. & Rosin-Paumier, S. & Masrouri, F., 2021. "A numerical study into effects of soil compaction and heat storage on thermal performance of a Horizontal Ground Heat Exchanger," Renewable Energy, Elsevier, vol. 172(C), pages 740-752.
    4. Shi, Yu & Cui, Qiliang & Song, Xianzhi & Xu, Fuqiang & Song, Guofeng, 2022. "Study on thermal performances of a horizontal ground heat exchanger geothermal system with different configurations and arrangements," Renewable Energy, Elsevier, vol. 193(C), pages 448-463.
    5. Liu, Jun & Wang, Fenghao & Cai, Wanlong & Wang, Zhihua & Li, Chun, 2020. "Numerical investigation on the effects of geological parameters and layered subsurface on the thermal performance of medium-deep borehole heat exchanger," Renewable Energy, Elsevier, vol. 149(C), pages 384-399.
    6. Perego, Rodolfo & Viesi, Diego & Pera, Sebastian & Dalla Santa, Giorgia & Cultrera, Matteo & Visintainer, Paola & Galgaro, Antonio, 2020. "Revision of hydrothermal constraints for the installation of closed-loop shallow geothermal systems through underground investigation, monitoring and modeling," Renewable Energy, Elsevier, vol. 153(C), pages 1378-1395.
    7. Chen, Chaofan & Cai, Wanlong & Naumov, Dmitri & Tu, Kun & Zhou, Hongwei & Zhang, Yuping & Kolditz, Olaf & Shao, Haibing, 2021. "Numerical investigation on the capacity and efficiency of a deep enhanced U-tube borehole heat exchanger system for building heating," Renewable Energy, Elsevier, vol. 169(C), pages 557-572.
    8. Jia, G.S. & Ma, Z.D. & Xia, Z.H. & Wang, J.W. & Zhang, Y.P. & Jin, L.W., 2021. "Investigation of the horizontally-butted borehole heat exchanger based on a semi-analytical method considering groundwater seepage and geothermal gradient," Renewable Energy, Elsevier, vol. 171(C), pages 447-461.
    9. Jun Liu & Yuping Zhang & Zeyuan Wang & Cong Zhou & Boyang Liu & Fenghao Wang, 2023. "Medium Rock-Soil Temperature Distribution Characteristics at Different Time Scales and New Layout Forms in the Application of Medium-Deep Borehole Heat Exchangers," Energies, MDPI, vol. 16(19), pages 1-22, October.

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