Faculty of Information Science and Electrical Engineering, Kyushu University
Abstract
Possibilities of the future society with hydrogen utilization have been discussed as one of the advanced technologies for the improvement of the energy and environmental problems in recent decades. In order to go on generating the effective energies by oxidizing the hydrogen with a fuel cell etc., it is necessary to establish the total system for producing, transporting, storing and transferring the hydrogen safely and stably. At that time, it can also be essential to use the hydrogen as a liquefied gas as well as a compressed gas. In this study, the operation of a superconducting level sensor for liquid hydrogen with a magnesium-diboride wire is numerically simulated on the basis of experimental results carried out previously. The time evolution of temperature distribution along the wire is calculated with a heat balance equation including the cooling effects of liquid hydrogen and its vaporized gas. The influences of the wire size and material properties on minimum propagating current and power consumption in the gaseous hydrogen are evaluated toward the optimal design of the level sensor
