A two-stage segregation auto-cascade refrigeration system was studied.The vapor-liquid equilibrium characteristics of a ternary mixed-refrigerant

composition change rules and operating characteristics of the ternary system were investigated.Refprop 8.0

general software for mixed-refrigerant property analysis with abroad applications

was used.The composition proportion of mixed-refrigerant was discussed according to the cooling capacity balance characteristics of evaporative condense and a reasonable proportion was obtained.The separation

mixing and operating characteristics of auto-cascade refrigeration system mixed-refrigerant were analyzed on the basis of spatial changes of five plane pressure-enthalpy diagrams.According to the experimental research

high-low pressure bypass and phase separator outlet vapor bypass of circulatory system could effectively improve the high discharge pressure and discharge temperature in the starting process.The throttle cooling process of each stage was analyzed

and the suction and discharge temperatures and evaporative temperature of compressor were studied.