Geothermal energy is heat generated and stored beneath the Earth's surface. The potential to reduce dependence on fossil fuels has led to increased interest in geothermal resources in recent years. This master thesis focuses on an area in north-eastern Slovenia that has been identified as a geothermal prospective area due to its geological characteristics. Thermal water aquifers and their characteristics have been identified, as well as the users of thermal water. Due to the relatively low temperatures of the thermal water, it is used in a cascade system, where space heating and sanitary water heating are followed by heating of swimming pool complexes with balneology, and it is also used for district heating and heating of greenhouses. A common reason for stopping the use of geothermal water is not energy scarcity, but water availability. Therefore, returning the thermally used water back to the aquifer is crucial to maintain the water balance and prevent over-exploitation, thus allowing a sustainable use of the resource in the long term. In the framework of the master thesis, a simulation of the thermal and hydraulic impact of the use of a geothermal doublet in the Korovci area was presented. The findings show that numerical modelling of the hydraulic and temperature response of the deposit is crucial for the long-term and efficient exploitation of geothermal energy.
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