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Effect of vertical ground temperature distribution on parameter estimation of in-situ thermal response test with unstable heat rate

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  • Zhang, Changxing
  • Song, Wei
  • Liu, Yufeng
  • Kong, Xiangqiang
  • Wang, Qing

Abstract

This paper proposed a parameter estimation method for identifying ground thermal conductivity and volumetric heat capacity using the Nelder-Mead Simplex search algorithm (NMSA) in in-situ thermal response test (TRT) with unstable heat rate, the duct storage system (DST) model for borehole heat exchanger (BHE) was applied to do with variable heat rate and the vertical ground temperature distribution in initial soil temperature. The parameter estimation was carried out using the in-situ TRT data in Qingdao, and the effect of vertical ground temperature distribution on estimated results was compared and analyzed. The relative error of estimated ground thermal conductivity using the regression temperature fitted by the test temperatures from the 5th m depth to the 120th m depth decreased by about 9.1% than that corresponding to the integral mean temperature calculated by test temperatures from the 5th m depth to the 120th m depth. However, the estimated volumetric heat capacity is hardly sensitive to initial soil temperature, and the relative errors are not higher than 2% no matter how to do with initial soil temperature.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:136:y:2019:i:c:p:264-274
    DOI: 10.1016/j.renene.2018.12.112
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    References listed on IDEAS

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    Cited by:

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    2. 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.
    3. Deng, Zhenpeng & Nian, Yongle & Cheng, Wen-long, 2023. "Estimation method of layered ground thermal conductivity for U-tube BHE based on the quasi-3D model," Renewable Energy, Elsevier, vol. 213(C), pages 121-133.
    4. Du, Yufang & Li, Min & Li, Yong & Lai, Alvin CK., 2023. "Tikhonov regularization stabilizes multi-parameter estimation of geothermal heat exchangers," Energy, Elsevier, vol. 262(PB).
    5. Ignacio Martín Nieto & Cristina Sáez Blázquez & Arturo Farfán Martín & Diego González-Aguilera, 2020. "Analysis of the Influence of Reducing the Duration of a Thermal Response Test in a Water-Filled Geothermal Borehole Located in Spain," Energies, MDPI, vol. 13(24), pages 1-19, December.
    6. Song, Wei & Wang, Jing & Jin, Yue & Zheng, Changjin & Zhang, Bo, 2023. "Optimization of the thermal response test under voltage fluctuations based on the infinite line source model," Renewable Energy, Elsevier, vol. 203(C), pages 731-740.

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