OPTIMUM COMPOSITION CALCULATION FOR MULTICOMPONENTS CRYOGENIC MIXTURE USED IN JOULE-THOMSON CRYOCOOLER

The use of multicomponent mixtures of Freons or the light hydrocarbons with argon or nitrogen in the Joule-Thomson refrigeration cycle can largely improve the thermodynamic performamce of JT cryocooler. However there are different thermodynamic performances of J-T cryocooler using mixtures withsame components but different compositions, so there must be an optimum composition for mixture with givencomponents. In this paper, an optimization calculation program is developed. In this program, we use thethermodynamic perfect degree（also caned Carnot Froaction） Of J-T cryocooler as the objective function tobe maximized. The Complex Optimization Algorithm（COA） is introduced. The calculation result can behelpful in the experimental investigation of the mixed gas refrigerants J-T refrigerator.