A refrigerating system may include a compressor configured to compress a non-azeotropic mixed refrigerant, a condenser configured to condense the compressed non-azeotropic mixed refrigerant, a three-way valve configured to branch the non-azeotropic mixed refrigerant condensed by the condenser, a first evaporator configured to supply cold air to a first interior space, a second evaporator configured to supply cold air to a second interior space at a temperature higher than at a temperature of the first interior space, and a capillary tube configured to expand the non-azeotropic mixed refrigerant branched by the three-way valve and supply the expanded non-azeotropic mixed refrigerant to at least one of the first evaporator or the second evaporator. With such features, a high-efficiency refrigerating system to which the non-azeotropic mixed refrigerant is applied may be implemented.

A refrigerating system may include a compressor configured to compress a non-azeotropic mixed refrigerant, a condenser configured to condense the compressed non-azeotropic mixed refrigerant, a three-way valve configured to branch the non-azeotropic mixed refrigerant condensed by the condenser, a first evaporator configured to supply cold air to a first interior space, a second evaporator configured to supply cold air to a second interior space at a temperature higher than at a temperature of the first interior space, and a capillary tube configured to expand the non-azeotropic mixed refrigerant branched by the three-way valve and supply the expanded non-azeotropic mixed refrigerant to at least one of the first evaporator or the second evaporator. With such features, a high-efficiency refrigerating system to which the non-azeotropic mixed refrigerant is applied may be implemented.

Disclosed and described herein are example refrigeration units having an interior conditioned space and a refrigeration circuit charged with a refrigerant, such as an A3 refrigerant. The refrigeration circuit includes a compressor-condenser assembly that is thermally isolated from an ambient environment of the conditioned space. An air plenum structure may thermally isolate the compressor-condenser assembly from the ambient environment of the conditioned space and direct heated rejection from refrigeration system. In an operational configuration in which the refrigeration system is installed in a structure, the compressor-condenser assembly may be thermally isolated from the ambient environment of the conditioned space via at least a portion of the structure, such as by positioning the compressor-condenser assembly on an exterior wall of the structure and coupling the compressor-condenser with the refrigeration circuit and conditioned space through the wall.