CRYOGENIC REFRIGERATION DEVICE, CRYOGENIC FLUID AND CRYOGENIC REFRIGERATION METHODE

摘要

The present invention provides a refrigerant composite used in a cascade type refrigeration apparatus and relates to the refrigerant composite including a first refrigerant with CHCl_2CF_3, CHClFCF_3 and CH_2F_2; a second refrigerant with CF_3CF_3 and CHF_3; a third refrigerant with CF_4 and a fourth refrigerant with one or more gases selected among Ar, He, N_2 and Ne.