Liquid Hydrogen and Applied Superconductivity
—For Advanced Utilization in the Community—

Abstract

To utilize liquid and slush hydrogen at temperatures between 15 to 20 K as the refrigerant of HTS and MgB₂ superconductors with a clean energy carrier without exhaust of CO₂, a few methods are suggested. The boil-off gas of para-hydrogen must be pure and can also be fed to PEFC for highly efficient electric power generation. If it were possible to construct long and thermally well-insulated para-hydrogen transfer lines, for example, along highways, it would be possible to transfer high-current electric power through refrigerated HTS and MgB₂ cables without loss. The technologies of combining liquid hydrogen and HTS, MgB₂ superconductors will give rise to new solutions for clean energy use in communities around the world.