{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,20]],"date-time":"2026-06-20T04:38:38Z","timestamp":1781930318594,"version":"3.54.5"},"reference-count":25,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2016,2,29]],"date-time":"2016-02-29T00:00:00Z","timestamp":1456704000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/s16030306","type":"journal-article","created":{"date-parts":[[2016,2,29]],"date-time":"2016-02-29T10:55:59Z","timestamp":1456743359000},"page":"306","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":91,"title":["Ground Thermal Diffusivity Calculation by Direct Soil Temperature Measurement. Application to very Low Enthalpy Geothermal Energy Systems"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0631-0021","authenticated-orcid":false,"given":"Jos\u00e9","family":"And\u00fajar M\u00e1rquez","sequence":"first","affiliation":[{"name":"Escuela T\u00e9cnica Superior de Ingenier\u00eda, Universidad de Huelva, Ctra. Palos de la Ftra.-Huelva s\/n, Huelva 21819, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miguel","family":"Mart\u00ednez Boh\u00f3rquez","sequence":"additional","affiliation":[{"name":"Escuela T\u00e9cnica Superior de Ingenier\u00eda, Universidad de Huelva, Ctra. Palos de la Ftra.-Huelva s\/n, Huelva 21819, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergio","family":"G\u00f3mez Melgar","sequence":"additional","affiliation":[{"name":"Escuela T\u00e9cnica Superior de Ingenier\u00eda, Universidad de Huelva, Ctra. Palos de la Ftra.-Huelva s\/n, Huelva 21819, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2016,2,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"233","DOI":"10.4028\/www.scientific.net\/AMR.1114.233","article-title":"Recent advances of the basic concepts in geothermal turbines of low and high enthalpy","volume":"1114","author":"Popescu","year":"2015","journal-title":"Adv. Mater. Res."},{"key":"ref_2","unstructured":"Carmo, C., Elmegaard, B., Nielsen, M.P., and Detlefsen, N. (2015, January 16\u201322). Empirical platform data analysis to investigate how heat pumps operate in real-life conditions. 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