Research on a Novel Helium Cryogenic Refrigeration Cycle on the Basis of a Transonic Two-Phase Expander
In the context of the"dual carbon target",the transonic two-phase expander(TTPE)is introduced into a new helium cryogenic refrigeration cycle,and its thermal analysis and simulation are carried out because of its cutting edges including excellent expansion refrigeration effect and no moving parts.The results indicate that the optimal inlet pressure of TTPE is 1600 kPa,when the COP and relative Carnot efficiency are 0.368 and 43.1％,respectively.As the inlet temperature of TTPE decreases,COP and relative Carnot efficiency can reach a maximum of 0.468 and 43.6％,separately.As the outlet pressure of the two-phase separation section increases,the COP and relative Carnot efficiency can increase to 0.413 and 59.0％,separately.With the elevation of the Laval nozzle isentropic efficiency,the maximum values of COP and relative Carnot efficiency are 0.435 and 50.8％,respectively.Thermal analysis and simulation results suggest that the novel helium cryogenic refrigeration cycle holds significant potential for development,serving as a reference for research on helium efficient refrigeration.
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