Regenerative Multiphysics Framework for High-Density Energy Harvesting via Cryogenic Phase-Change and HTS-MHD Integration

AbstractThe Smart-Cryogenic HTS-MHD Hybrid Generator (SCG-HMH) is a novel, combustion-free powersystem that integrates cryogenics, high-temperature superconductivity (HTS), and magnetohydrodynamics (MHD) to achieve realistic overall system efficiencies of 65–80% through regenerative waste-heat recycling and closed-loop recirculation. It uses atmospheric nitrogen (N₂) as the working fluid via the 1:694 volumetric expansion of LN₂ to drive a radial turbo-expander. HTS bearings provide near-frictionless operation at up to 100,000 RPM with fields up to 20 T. Plasma ionization occurs selectively in dense alternating magnetic fields, withunionized N₂ acting as a natural dielectric insulator (>10 kV/mm at cryogenic temperatures) and cold plasma medium. The hybrid design combines heat-engine generation with heat-pump-like regeneration: internal "unpaid" waste energies (e.g., plasma and stator losses) are recycled to drive additional expansion without external costs, while cold recirculation reduces liquefaction parasitics by 50–70%. Modular design (10 kW base units) supports distributed applications from micro-grids to Mars colonies. Realistic power densities of 50–100 MW/m³ are achievable, with overall efficiencies surpassing conventional systems (30–60%) while complying with thermodynamic limits. COP >1 is limited to the regenerative subsystem (2–4), reflecting heat movement rather than creation. Atomic-scale multielectron extraction from N₂ enhances plasma conductivity for MHD harvest.References, citation and simulation results are provided in main document