Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Analysis of the heat transfer and flow in saturated sand

The TESSAS installation is, as a demonstration plant, equipped with a unique underground temperature monitoring system. In total, 66 temperature sensors were placed at various places on different depths inside, below and outside the energy storage field. Due to the continuous logging of ground and flow temperatures as well as flow rate, a complete view of the energy transfer to and temperature spread in the underground could be obtained.

These efforts allowed an analysis of the heat transfer in the water saturated sand layer. Many influencing parameters on this heat transfer and distribution can be determined as there are ground water flow, hydraulic conductivity and heat convection. Heat transfer in water saturated sand layers is thereby much more complicated in comparison with heat storage in clay or solid rock. Due to the storage of heat at a high temperature level, the described effects are even more significant.

The obtained results are very valuable in understanding the heat transfer process in the underground. At the moment, some heat transfer processes aren’t described very well. Especially the heat convection flow becomes very important at high temperatures, especially for sediments with a significant hydraulic conductivity. This led to increased heat losses through the top of the storage field. This analysis is valuable for researchers dealing with underground thermal energy storage in order to optimize borehole storage design. In future, adaptations on the simulation tools are necessary in order to include all relevant parameters (convection flow, ground water flow).

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Boeretang 200
2400 Mol
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