The invention provides a multi-element mixed
refrigerant which comprises 3,3,3-trifluoropropene and
propane. The
molar percentage concentration of 3,3,3-trifluoropropene is 5-85%, and the
molar percentage concentration of
propane is 15-95%. The multi-element mixed
refrigerant is suitable for a stand-alone compressing and refrigerating
system, has the
ozone depletion potential (ODP) of zero, and cannot harm the
atmospheric ozone layer and has quite small
global warming potential (GWP) after being used for a long time. In addition, since the multi-element mixed
refrigerant comprises 3,3,3-trifluoropropene and
propane, for a two-element mixture, azeotropic refrigerating working substances can keep the stable evaporating working state under the
boiling point, and convenience is provided for the injection of the refrigerant and the maintenance of the refrigerating
system. In addition, the multi-element mixed refrigerant has a small pressure ratio, and the efficiency of a compressor can be effectively improved by reducing the pressure ratio.