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Energies 2017, 10(6), 795; doi:10.3390/en10060795

Measuring of Thermal Conductivities of Soils and Rocks to Be Used in the Calculation of A Geothermal Installation

Department of Cartographic and Land Engineering, University of Salamanca, Higher Polytechnic School of Avila, Hornos Caleros 50, 05003 Avila, Spain
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Author to whom correspondence should be addressed.
Academic Editor: Jacek Majorowicz
Received: 29 March 2017 / Revised: 15 May 2017 / Accepted: 6 June 2017 / Published: 10 June 2017
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Abstract

The thermal conductivity of soils and rocks constitutes an important property for the design of geothermal energy foundations and borehole heat exchange systems. Therefore, it is interesting to find new alternatives to define this parameter involved in the calculation of very low enthalpy geothermal installations. This work presents the development of an experimental set-up for measurements of thermal conductivity of soils and rocks. The device was designed based on the principle of the Guarded Hot Plate method using as heat source a laboratory heater. The thermal conductivity of thirteen rocky and soil samples was experimentally measured. Results are finally compared with the most common thermal conductivity values for each material. In summary, the aim of the present research is suggesting a procedure to determine the thermal conductivity parameter by a simple and economic way. Thus, increases of the final price of these systems that techniques such as the “Thermal Response Test” (TRT) involvs, could be avoided. Calculations with software “Earth Energy Designer” (EED) highlighted the importance of knowing the thermal conductivity of the surrounding ground of these geothermal systems. View Full-Text
Keywords: thermal conductivity; very low enthalpy geothermal installation; Guarded Hot Plate method; Thermal Response Test (TRT); Earth Energy Designer (EED) thermal conductivity; very low enthalpy geothermal installation; Guarded Hot Plate method; Thermal Response Test (TRT); Earth Energy Designer (EED)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sáez Blázquez, C.; Farfán Martín, A.; Martín Nieto, I.; Gonzalez-Aguilera, D. Measuring of Thermal Conductivities of Soils and Rocks to Be Used in the Calculation of A Geothermal Installation. Energies 2017, 10, 795.

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