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Determination of the thermal conductivity of sandstones from laboratory to field scale

  • Jin LuoEmail author
  • Jia Jia
  • Haifeng Zhao
  • Yongqiang Zhu
  • Qinghai Guo
  • Chaojie Cheng
  • Long Tan
  • Wei Xiang
  • Joachim Rohn
  • Philipp Blum
Thematic Issue
Part of the following topical collections:
  1. Subsurface Energy Storage II

Abstract

For an optimum design of borehole heat exchangers (BHE) of ground-source heat pump systems, the thermal properties of the ground have to be determined. Thermal properties are typically estimated or measured in the laboratory or in the field. However, the determined values might deviate depending on the scale of observation. Thus, it is important to investigate scale effects. This study determines the thermal conductivity determination of silty sandstone from laboratory to field scale. Thermal conductivity and thermal capacity varying with water saturation are initially investigated in the laboratory. Results show that thermal conductivity increases obviously with increasing water saturation. In addition, effective thermal conductivity of the ground is estimated by a thermal response test in field resulting in a thermal conductivity (λ) of 1.84 W/m K. By comparison with the laboratory results (λ = 2.23 W/m K), the field-derived thermal conductivity shows lower values indicating a scale effect. Microscope image and wave velocity are also studied to investigate the structure of the sandstone. These results indicate that there exist a large numbers of fractures in the silty sandstone, implying that the thermal response test is largely affected by these fractures. Hence, the scale effects should be carefully considered in evaluation of thermal conductivity in particular for fractured porous rocks.

Keywords

Thermal conductivity Laboratory measurements Thermal response test (TRT) Structure analysis Wave velocity 

Notes

Acknowledgments

Special thanks go to the National Natural Science Foundation of China (NSFC) for the funding of this work (authorized no. 41502238). The project was also supported by the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) nos. CUGL150818 and CUGL 150610. Furthermore, we thank the European Regional Development Fund “Investition in Ihre Zukunft” for co-financing this research project.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Jin Luo
    • 1
    Email author
  • Jia Jia
    • 1
  • Haifeng Zhao
    • 2
  • Yongqiang Zhu
    • 1
  • Qinghai Guo
    • 1
  • Chaojie Cheng
    • 1
  • Long Tan
    • 1
  • Wei Xiang
    • 1
  • Joachim Rohn
    • 3
  • Philipp Blum
    • 4
  1. 1.Faculty of Engineering, School of Environmental StudiesChina University of Geosciences (Wuhan)WuhanPeople’s Republic of China
  2. 2.Survey Research Institute of the Three Gorges Co. Ltd.WuhanPeople’s Republic of China
  3. 3.Geo-Center of Northern BavariaUniversity of Erlangen-NürnbergErlangenGermany
  4. 4.Institute for Applied Geosciences (AGW)Karlsruhe Institute of Technology (KIT)KarlsruheGermany

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