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Modeling Thermal Energy Storage in Rocks

Summary Excessive use of fossil fuels has negative effects on the environment, such as climate change that is affecting the balance of nature and endangering human life. Other forms of energy should replace fossil energy thus temporary energy storage systems could be a key component. Therefore, geophysical research in the area of rock heat transfer plays an important role. This work aims to evaluate the potential of rocks/minerals as reservoirs of thermal energy through measurements of specific heat in terms of volume and mass in a diverse set of samples. The one most suitable, Moncorvo hematite ore, was tested in a heat exchange system constituted by a cylindrical reservoir. This allowed to study the heat transfer between water and rock. The experiment was then matched with a numerical model developed, allowing to conclude that the experimental model overlaps the numerical model whenever the temperature increases gradually.