DEMOSTHENE: Demonstrator of seasonal heat energy storage in partially-flooded mine

The research project DEMOSTHENE is funded by the French region of Hauts-de-France. It consists in designing and operating an experimental site of hot water storage in an abandoned mine. If it is conclusive, it aims at valorizing the many abandoned mines of this territory by realizing several heat energy seasonal storages.
  • The objective of this project is to operate an experimental pilot to estimate the energy efficiency of this type of storage and to identify the possible risks that thermal cycles may pose to the stability of underground voids.

    The demonstrator is implemented in the Parrain’s limestone mine, located in Saint-Maximin (Oise, France), for a period of 12 to 24 months. It is based on a 120 m3 hot water basin, used to simulate the summer air conditioning and then the winter heating of a 180 m² building that would be on surface. The experiment began in July 2017 and consists of filling the basin with water at 10 °C, warming it up to 80 °C over a period of 6 months and then cooling it over a similar period.

    A multi-parameter instrumentation has been set up with 25 different probes. It includes the monitoring of (i) the warming and the cooling of the basin and its surrounding environment (air, backfill, rock), (ii) the quantification of the air masses exchanges between the basin and the rest of the cavity, (iii) the measurement of the deformations of the massif in contact with the basin, and (iv) the evolution of the rock water content.

    All data is acquired, managed and shared with Ineris partners via the e.cenaris monitoring infrastructure.

    The experimental site may be visited upon request to Ineris.


    Schematic view of basin instrumentation


    Front view of the basin
    (Legend : 1 = Warmwater, 2 = Damm, 3 = Data recorder, 4 = support panel )

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