Abstract :
[en] Nowadays, most countries are striving to transition their energy matrices towards renewable sources. To achieve this goal, energy storage systems play a crucial role in compensating for the inherent intermittency of renewable sources. Buildings are among the largest consumers of primary energy, due to their heating demands. Consequently, integrating renewable energies into buildings is essential. This paper presents a pioneering approach that integrates renewable energy sources with a multi-energy system. This system powers a Heat Pump (HP) responsible for heating an abandoned mine flooded with water, producing electricity via a Carnot Battery (CB), and distributing heating and cooling through a district heating network (DHN).This study is conducted in a real case of an abandoned slate mine in Martelange, Belgium, where three different size caverns are employed to store energy: 800, 6840, and 80000 m3 for hot (90°C), medium (50°C), and cold (5°C) water temperature, respectively. The system combines photovoltaic panels, an electrical battery, heat pumps, electrical resistance, and an Organic Rankine Cycle. This study highlights the potential of reusing abandoned mines as energy storage systems, which can benefit adjacent communities by integrating diverse energy demands within a single system. This generates new perspectives for investors and residents, enabling the possibility of connecting the system to the grid for energy arbitrage and balancing services.
