Patent attributes
A non-azeotropic refrigerant mixture attains an extremely low temperature of −200 deg. C. through −150 deg. C. in a refrigerating system equipped with a heat exchanger;a non-azeotropic refrigerant mixture which attains a low temperature of −100 deg. C. or lower is a non-azeotropic refrigerant mixture which comprises a base refrigerant and R-14 wherein R-14 is contained in an amount of 5 wt % through 40 wt %, whereas the base refrigerant consists of butane plus propane and R-23 plus R-116 as the low boiling point refrigerant;also, a non-azeotropic refrigerant mixture that attains −120 deg. C. or lower is a non-azeotropic refrigerant mixture which comprises R-50 plus R-740 as well as a base refrigerant and R-14 wherein the base refrigerant/R-14 ratio is 95/5 through 60/40 and R-50 and R-740 are contained respectively in an amount of 1 wt % through 10 wt.
