Analysis and optimization of helium refrigerator process utilizing the turbo Brayton refrigerator as the pre-cooling stage

Abstract A helium refrigerator utilizing a turbine Brayton refrigerator instead of liquid nitrogen is proposed as the pre-cooling stage, and a thermodynamic system cycle flow is built up. Turbine Brayton refrigeration has the advantages of high efficiency, low maintenance costs, no free, and low noise. When applied in the pre-cooling stage of helium refrigerators, it can avoid the continuous supply of liquid nitrogen and improve the adaptability of helium refrigerators. We utilize genetic algorithms for component optimization and conduct thermodynamic research on the system under design conditions. The results indicate that the proposed system has better cyclic performance and can provide a reference and basis for practical engineering applications.