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K. H. Kim(김기환),M. Y. Ha(하만영),S. H. Kim(김석호) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Recently, research has been conducted on a method of applying liquefied hydrogen to increase energy density in hydrogen mobility. In addition, a high-temperature superconducting motor (HTS motor) having a high current density can be applied using the liquefied hydrogen as a refrigerant. The system for circulating the refrigerant in the HTS magnet of the motor and transferring liquefied hydrogen to a fuel cell can be organized. Therefore, a pressure build-up (PBU) method can be used to transfer liquid by pressurize the liquid hydrogen tank using a heater installed in the tank. Since PBU method involves the evaporation and condensation at varying tank pressure, it is difficult to predict thermo-hydraulic behavior of a complex cryogenic system. In this study, a test apparatus was developed in which a small cryogenic fluid storage tank capable of PBU, a cooling reservoir, a dummy HTS magnet were configured through the flow paths. The cooling target temperature of the dummy HTS magnet was set and the thermal load was applied step by step. Then, the heater of the PBU tank was operated to verify the flow rate and cooling performance. Prior to the use of liquid hydrogen, liquid nitrogen was used instead.