In the quest for sustainable energy solutions, a groundbreaking study led by Dan Azimi Mohaman from the University of Padua’s Department of Geosciences has shed light on the potential of closed-loop geothermal systems in high-temperature volcanic environments. The research, published in *Energy Conversion and Management: X* (translated as *Energy Conversion and Management: Next Generation*), offers a promising alternative to conventional geothermal methods, with significant implications for the energy sector, particularly in volcanic regions.
The study focuses on the technical feasibility and thermal performance of a closed-loop coaxial borehole heat exchanger (CBHE) in the high-enthalpy volcanic system of Vulcano Island, Italy. Using advanced numerical modeling, Azimi Mohaman and his team simulated coupled heat transfer and fluid flow within a multi-layered geological formation, considering temperature- and pressure-dependent water properties.
“Our findings demonstrate that optimized CBHE configurations can provide stable and sustainable thermal energy recovery in high-enthalpy volcanic systems,” Azimi Mohaman explained. The research revealed that increasing borehole depth significantly enhances heat extraction, with a 1000-meter insulated CBHE achieving up to 11 megawatts of electric power potential and outlet temperatures of 106°C after long-term operation.
The study also highlighted the importance of insulation configurations. At shallow depths, combining annulus and inner pipe insulation increased performance by 7.8%, while at greater depths, inner pipe insulation alone improved heat recovery by over 10%.
The implications for the energy sector are substantial. Closed-loop geothermal systems offer a technically feasible and environmentally safe alternative to conventional hydrothermal and enhanced geothermal systems. This technology could play a pivotal role in the decarbonization of volcanic island regions, providing a renewable energy source that is both sustainable and reliable.
As the world seeks to transition to cleaner energy sources, this research paves the way for future developments in closed-loop geothermal technologies. It offers a compelling case for investing in and advancing these systems, particularly in high-enthalpy regions where traditional geothermal methods may be less viable.
Azimi Mohaman’s work not only contributes to the scientific understanding of geothermal energy extraction but also opens up new commercial opportunities for the energy sector. By harnessing the power of volcanic environments, we can take a significant step towards a more sustainable and decarbonized future.
The study, published in *Energy Conversion and Management: X*, serves as a testament to the potential of innovative geothermal technologies in meeting the world’s growing energy demands while minimizing environmental impact. As the energy sector continues to evolve, the insights gained from this research will undoubtedly shape the development of next-generation geothermal systems, offering a cleaner, more sustainable energy landscape for generations to come.