Numerical Simulation of Regenerative Heat-driven Cryocoolers for Zero Boil-off Storage of Liquid Hydrogen [液氢无损储存回热式热驱动制冷机的数值模拟]

作者：Luo J.; Chen Y.; Zhang L.; Wang X.; Sun Y.; Luo E.; Lacoste D.

来源：Journal of Engineering Thermophysics, 2023, 44(1): 38-46.

• Exergy efficiency
• Numerical simulation
• Regenerative heat-driven cryocooler
• Sensitivity analysis
• Zero boil-off of liquid hydrogen

Aiming at the zero boil-off demand of liquid hydrogen storage tank, this paper uses SAGE software to simulate and optimize the 300 W @ 20 K regenerative heat-driven cryocoolers, and verifies the feasibility of duplex free-piston Stirling cryocooler and thermoacoustic heat-driven pulse tube cryocooler for the zero boil-off storage system of liquid hydrogen. The results show that when the mean pressure is 5 MPa, the working frequency is 50 Hz, and the heating temperature is 500?C, the exergy efficiency of the duplex free-piston Stirling cryocooler can reach 19.4%, while the exergy efficiency of the thermoacoustic heat-driven pulse tube cryocooler is 14.3%. However, because a fixed-parameter harmonic oscillator is used for coupling the engine and the cryocooler in the Stirling system, it is difficult to achieve multi-condition matching, which makes it very sensitive to changes in operating parameters such as mean pressure and heating temperature. In contrast, the thermoacoustic system is completely free of moving parts and has excellent adaptability to the operating conditions, making it a promising solution for the zero boil-off storage of liquid hydrogen.

• 单位
  中国科学院; 中国科学院大学