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Improved method and case study of thermal response test for borehole heat exchangers of ground source heat pump system

Author

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  • Wang, Huajun
  • Qi, Chengying
  • Du, Hongpu
  • Gu, Jihao

Abstract

Thermal response test (TRT) is crucial for the determination of the ground thermal conductivity and the evaluation of the thermal performance of borehole heat exchangers (BHEs) of ground source heat pump (GSHP) system. This paper presented a novel constant heating-temperature method (CHTM) for TRT. Further, a type of improved TRT equipment was developed and the mathematical model to deal with test data was presented. Based on the measurement of the natural ground temperature distribution, an in situ TRT case was carried out. The experimental results showed that, compared with the conventional TRT with constant heating-flux method (CHFM), CHTM has an obvious advantage of reducing the time period reaching a steady heat-transfer state between the BHE and its surrounding soils. This improved TRT equipment can effectively operate under both heat-injection and heat-extraction modes, and its test data can accurately reflect the thermal properties of the soils as well as the thermal performance of the BHE under different operation conditions. Finally, the advantages and disadvantages between CHTM and CHFM were compared, which can provide a useful reference for the design of GSHP system.

Suggested Citation

  • Wang, Huajun & Qi, Chengying & Du, Hongpu & Gu, Jihao, 2010. "Improved method and case study of thermal response test for borehole heat exchangers of ground source heat pump system," Renewable Energy, Elsevier, vol. 35(3), pages 727-733.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:3:p:727-733
    DOI: 10.1016/j.renene.2009.08.013
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    Citations

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    Cited by:

    1. Poulsen, S.E. & Alberdi-Pagola, M., 2015. "Interpretation of ongoing thermal response tests of vertical (BHE) borehole heat exchangers with predictive uncertainty based stopping criterion," Energy, Elsevier, vol. 88(C), pages 157-167.
    2. Alessandro Franco & Paolo Conti, 2020. "Clearing a Path for Ground Heat Exchange Systems: A Review on Thermal Response Test (TRT) Methods and a Geotechnical Routine Test for Estimating Soil Thermal Properties," Energies, MDPI, vol. 13(11), pages 1-21, June.
    3. Wang, Huajun & Liu, Biying & Yang, Feifan & Liu, Feng, 2021. "Test investigation of operation performance of novel split-type ground source heat pump systems for clean heating of rural households in North China," Renewable Energy, Elsevier, vol. 163(C), pages 188-197.
    4. 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.
    5. Zhang, Changxing & Song, Wei & Liu, Yufeng & Kong, Xiangqiang & Wang, Qing, 2019. "Effect of vertical ground temperature distribution on parameter estimation of in-situ thermal response test with unstable heat rate," Renewable Energy, Elsevier, vol. 136(C), pages 264-274.
    6. Wanli Wang & Guiling Wang & Feng Liu & Chunlei Liu, 2022. "Characterization of Ground Thermal Conditions for Shallow Geothermal Exploitation in the Central North China Plain (NCP) Area," Energies, MDPI, vol. 15(19), pages 1-16, October.
    7. Jin Luo & Yuhao Zhang & Jiasheng Tuo & Wei Xue & Joachim Rohn & Sebastian Baumgärtel, 2020. "A Novel Approach to the Analysis of Thermal Response Test (TRT) with Interrupted Power Input," Energies, MDPI, vol. 13(19), pages 1-14, September.
    8. Ni, Long & Dong, Jiankai & Yao, Yang & Shen, Chao & Qv, Dehu & Zhang, Xuedan, 2015. "A review of heat pump systems for heating and cooling of buildings in China in the last decade," Renewable Energy, Elsevier, vol. 84(C), pages 30-45.
    9. Bozzoli, F. & Pagliarini, G. & Rainieri, S. & Schiavi, L., 2011. "Estimation of soil and grout thermal properties through a TSPEP (two-step parameter estimation procedure) applied to TRT (thermal response test) data," Energy, Elsevier, vol. 36(2), pages 839-846.
    10. Aydın, Murat & Sisman, Altug, 2015. "Experimental and computational investigation of multi U-tube boreholes," Applied Energy, Elsevier, vol. 145(C), pages 163-171.

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