Experimental studies for improving the performances of compact coil ground heat exchangers

Abstract : A test facility for closed-loop shallow ground heat exchangers has been implemented in Orléans (France) in 2008. Different configurations have been tested and evaluated, beginning with the traditional horizontal and vertical ground heat exchangers. For five years, a special attention has been given to this test facility to innovative ground heat exchangers with a focus on " compact coil ground heat exchangers " (CGHE). CGHE are ground heat exchangers with a coil spring shape which are installed at a depth between 2 and 10 m. These systems represent an alternative solution to borehole heat exchangers, installed at about 100 m and requiring a drilling machine, and horizontal ground heat exchangers, installed at about 1 m depth and requiring a sufficient land area. The CGHE are installed with a simple backhoe and require less land area than horizontal ground heat exchangers. In order to improve the design and thermal performances of these CGHE, research works have been carried out in the four following axis:-First, different types of CGHE have been tested in order to compare their performances and to propose improvements to the CGHE design.-Second, coupled heat and mass transfers in the vicinity of the heat exchanger pipe have been investigated in a laboratory experiment to better understand soil temperature and moisture content evolution as a function of heat-carrier fluid temperature.-Third, the soil – atmosphere interaction has been characterized by means of a detailed instrumentation in the subsurface soil (temperature and humidity probes) and in the atmosphere (weather data station). Finally, two same geometries of CGHE have been installed in different environmental conditions to improve the installation process by changing the properties of the filling material. This study aims at showing these experiments and results obtained through a pluri-annual research program on these CGHE using a scale 1 test facility. In conclusion, some recommendations will be proposed to better install these particular types of ground heat exchangers.
Type de document :
Communication dans un congrès
European Geothermal Congress : EGC 2016, Sep 2016, Strasbourg, France. 2016, 〈http://europeangeothermalcongress.eu/〉
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https://hal-brgm.archives-ouvertes.fr/hal-01328915
Contributeur : Mikael Philippe <>
Soumis le : mercredi 8 juin 2016 - 15:32:48
Dernière modification le : lundi 26 septembre 2016 - 14:15:34

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  • HAL Id : hal-01328915, version 1

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Mikael Philippe, Maha Chalhoub, Charles Maragna, Louis Juillac. Experimental studies for improving the performances of compact coil ground heat exchangers. European Geothermal Congress : EGC 2016, Sep 2016, Strasbourg, France. 2016, 〈http://europeangeothermalcongress.eu/〉. 〈hal-01328915〉

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