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Serial Laboratory Effective Thermal Conductivity Measurements of Cohesive and Non-cohesive Soils for the Purpose of Shallow Geothermal Potential Mapping and Databases—Methodology and Testing Procedure Recommendations

Author

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  • Aleksandra Łukawska

    (Polish Geological Institute–National Research Institute, Rakowiecka 4 Street, 00-975 Warsaw, Poland)

  • Grzegorz Ryżyński

    (Polish Geological Institute–National Research Institute, Rakowiecka 4 Street, 00-975 Warsaw, Poland)

  • Mateusz Żeruń

    (Polish Geological Institute–National Research Institute, Rakowiecka 4 Street, 00-975 Warsaw, Poland)

Abstract

The article presents the methodology of conducting serial laboratory measurements of thermal conductivity of recompacted samples of cohesive and non-cohesive soils. The presented research procedure has been developed for the purpose of supplementing the Engineering–Geology Database and its part–Physical and Mechanical Properties of Soils and Rocks (abbr. BDGI-WFM) with a new component regarding thermal properties of soils. The data contained in BDGI-WFM are the basis for the development of maps and plans for the assessment of geothermal potential and support for the sustainable development of low enthalpy geothermal energy. Effective thermal conductivity of soils was studied at various levels of water saturation and various degrees of compaction. Cohesive soils were tested in initial moisture content and after drying to a constant mass. Non-cohesive soils were tested in initial moisture, fully saturated with water and after drying to a constant mass. Effective thermal conductivity of non-cohesive soils was determined on samples mechanically compacted to the literature values of bulk density. Basic physical parameters were determined for each of the samples. In total, 120 measurements of thermal conductivity were carried out, for the purposes of developing the guidelines which allowed statistical analysis of the results. The results were cross-checked with different measuring equipment and with the literature data.

Suggested Citation

  • Aleksandra Łukawska & Grzegorz Ryżyński & Mateusz Żeruń, 2020. "Serial Laboratory Effective Thermal Conductivity Measurements of Cohesive and Non-cohesive Soils for the Purpose of Shallow Geothermal Potential Mapping and Databases—Methodology and Testing Procedure," Energies, MDPI, vol. 13(4), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:4:p:914-:d:321973
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    1. 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.
    2. Florides, G.A. & Pouloupatis, P.D. & Kalogirou, S. & Messaritis, V. & Panayides, I. & Zomeni, Z. & Partasides, G. & Lizides, A. & Sophocleous, E. & Koutsoumpas, K., 2011. "The geothermal characteristics of the ground and the potential of using ground coupled heat pumps in Cyprus," Energy, Elsevier, vol. 36(8), pages 5027-5036.
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