ABDELMOUMEN SHAD SERROUNE , I Rahman KHASANI, Sopaheluwakan Jan, Francois Duquet, Lee Yongsoon, Deborah Masset, Lee Dong Kyu

This study investigates the performance and stability of a proprietary ionic nanofluid developed by GEIOS Technologies for medium to high-temperature geothermal applications. The nanofluid integrates boron nitride nanoparticles, proprietary surface modifiers, and quantum-optimized additives to enhance thermal conductivity, heat transfer efficiency, and operational stability in closed-loop geothermal systems. Experimental testing was conducted across 160-230°C using closed-loop U-tube configurations (100 mL, 1L, and 10L), assessing both thermal performance and long-term stability. The results indicate a 60% reduction in parasitic loads compared to conventional geothermal fluids, maintaining a specific heat capacity of 1500 J/(kg·K) and achieving 94% thermal retention efficiency over 1,000 hours of continuous operation. The nanofluid exhibited a stable heat transfer coefficient of 31.75 W/m²·K, enabling a 26°C/min ramp-up rate with minimal degradation over 12 thermal cycles. Integration into binary cycle geothermal systems demonstrated a significant enhancement in Organic Rankine Cycle (ORC) efficiency, allowing for higher operating temperatures with reduced energy input. Quantum-enhanced mechanisms, including phonon-mediated conduction and skyrmion-assisted heat transfer, facilitated a 4-6× improvement in thermal boundary conductance, reducing system energy losses and improving long-term operational efficiency. These findings establish the GEIOS ionic nanofluid as a breakthrough technology in geothermal energy, offering superior heat transport, enhanced efficiency, and scalable deployment potential. The demonstrated thermal stability and reduced energy consumption present a viable pathway for commercial-scale geothermal power generation.