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Optimisation des sondes géothermiques en système fermé (GeoTherWal) [Optimization of closed-loop borehole heat exchanger (GeoTherWal)]

[With increasing worldwide energy consumption, improvement and assessment of renewable energy sources is significant nowadays. Geothermal energy, one of the renewable energy sources, is the form of energy stored as heat in the underground, and within a range of 0-400m depth stored heat is categorized as shallow geothermal energy. Beside some traditional applications (e.g. bathing and recreation), this energy can be used for instance in space heating and cooling, and commonly this type of utilization is referred to as direct use. One of the most common used ground source heat pump (GSHP) technologies, closed-loop systems, comprise a vertical (or horizontal) borehole heat exchanger (BHE) installed inside a borehole and a heat pump that circulates a solution of water or anti-freeze mixture through the buried pipes. Thus, the stored heat in the subsurface is transferred across the pipes. The total of the length of the BHE is based on the required amount of energy and the type of underground.. In the objective of maximizing the thermal transfer between the pipes and the ground, the geometry of the borehole heat exchanger and the properties of the grouting material must be optimized. To evaluate and optimize the performance of the geothermal system, the global problem is decomposed into two sub-problems: the near-field behaviour (at the level of the borehole heat exchanger) and the far-field behaviour (in the surrounding ground). Each problem is addressed from the double point of view of experimental developments and numerical analysis.]




Selçuk EROL

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borehole heat exchanger drilling geothemal energy sustainable development