Simulation and Analysis of a Novel Hydrogen Liquefaction Process Based on the Liquid Nitrogen and Helium Joule-Brayton Cycle.

To facilitate the design, analysis, and optimization of the hydrogen liquefaction system, this study developed a MATLAB-based independent simulation program encompassing unit equipment models and exergy analysis models. The program incorporated REFPROP software to accurately calculate fluid physical properties and the heat of conversion between ortho- and parahydrogen. The proposed hydrogen liquefaction process utilized LN precooling, the helium Joule-Brayton cryogenic cycle, and a throttle valve to efficiently produce liquid hydrogen.