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Sensors 2016, 16(3), 306; doi:10.3390/s16030306

Ground Thermal Diffusivity Calculation by Direct Soil Temperature Measurement. Application to very Low Enthalpy Geothermal Energy Systems

Escuela Técnica Superior de Ingeniería, Universidad de Huelva, Ctra. Palos de la Ftra.-Huelva s/n, Huelva 21819, Spain
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Academic Editor: Vittorio M. N. Passaro
Received: 30 January 2016 / Revised: 22 February 2016 / Accepted: 23 February 2016 / Published: 29 February 2016
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents a methodology and instrumentation system for the indirect measurement of the thermal diffusivity of a soil at a given depth from measuring its temperature at that depth. The development has been carried out considering its application to the design and sizing of very low enthalpy geothermal energy (VLEGE) systems, but it can has many other applications, for example in construction, agriculture or biology. The methodology is simple and inexpensive because it can take advantage of the prescriptive geotechnical drilling prior to the construction of a house or building, to take at the same time temperature measurements that will allow get the actual temperature and ground thermal diffusivity to the depth of interest. The methodology and developed system have been tested and used in the design of a VLEGE facility for a chalet with basement at the outskirts of Huelva (a city in the southwest of Spain). Experimental results validate the proposed approach. View Full-Text
Keywords: very low enthalpy geothermal energy; soil temperature; ground thermal diffusivity; ground temperature probe; instrumentation system very low enthalpy geothermal energy; soil temperature; ground thermal diffusivity; ground temperature probe; instrumentation system
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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

Andújar Márquez, J.M.; Martínez Bohórquez, M.Á.; Gómez Melgar, S. Ground Thermal Diffusivity Calculation by Direct Soil Temperature Measurement. Application to very Low Enthalpy Geothermal Energy Systems. Sensors 2016, 16, 306.

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