Method for controlling refrigerating system using non-azeotropic mixed refrigerant

A method for controlling a refrigerating apparatus, the refrigerating apparatus including a compressor to compress a non-azeotropic mixed refrigerant, a first evaporator and a second evaporator connected in series, the first evaporator to supply cold air to a freezer compartment and the second evaporator to supply cold air to a refrigerating compartment, the first evaporator disposed upstream of the second evaporator in a direction of the non-azeotropic mixed refrigerant flow, and a switch valve to switch a flow direction of the non-azeotropic mixed refrigerant to one of the first evaporator or the second evaporator, the switch valve disposed upstream of the first evaporator in a direction of the non-azeotropic mixed refrigerant flow, wherein the method comprises performing:

• in response to a freezer compartment/refrigerating compartment simultaneous operation mode, controlling the switch valve in which the non-azeotropic mixed refrigerant is directed to the first evaporator and to the second evaporator to respectively supply the cold air to the freezer compartment and the refrigerating compartment;
• in response to a freezer compartment operation mode, controlling the switch valve in which the non-azeotropic mixed refrigerant is directed to the first evaporator and the second evaporator;
• and
• in response to a refrigerating compartment operation mode, controlling the switch valve in which the non-azeotropic mixed refrigerant is directed to the second evaporator to supply the cold air to the refrigerating compartment without passing through the first evaporator,
• wherein the compressor has at least three different operation compression capacities, wherein the method comprises:
• in the freezer compartment/refrigerating compartment simultaneous operation mode, operating the compressor at a high compression capacity to provide a first amount of the non-azeotropic mixed refrigerant;
• in the freezer compartment operation mode, operating the compressor at a medium compression capacity to provide a second amount of the non-azeotropic mixed refrigerant smaller than the first amount of the non-azeotropic mixed refrigerant;
• and
• in the refrigerating compartment operation mode, operating the compressor at a low compression capacity to provide a third amount of the non-azeotropic mixed refrigerant smaller than the second amount of the non-azeotropic mixed refrigerant,
• wherein the refrigerating apparatus comprises a freezer compartment fan being a variable-speed fan to blow air to the first evaporator, the variable-speed fan having a first rotational speed and a second rotational speed which is faster than the first rotational speed, the method comprises operating the freezer compartment fan at the second rotational speed in the freezer compartment operation mode, and
• wherein the freezer compartment fan operates at the second rotational speed, the second amount of the non-azeotropic mixed refrigerant is evaporated at the first evaporator to supply the cold air to the freezer compartment, during the freezer compartment operation mode.

A method for controlling a refrigerating apparatus including a non-azeotropic mixed refrigerant, the refrigerating apparatus including a compressor, a first evaporator and a second evaporator connected in series, the first evaporator to supply cold air to a freezer compartment and the second evaporator to supply cold air to a refrigerating compartment, the first evaporator disposed upstream of the second evaporator in a direction of the non-azeotropic mixed refrigerant flow, and a switch valve to switch a flow direction of the non-azeotropic mixed refrigerant to one of the first evaporator or the second evaporator, the switch valve disposed upstream of the first evaporator in a direction of the non-azeotropic mixed refrigerant flow, the method comprising:

• determining whether a temperature of the freezer compartment satisfies a first target temperature and a temperature of the refrigerating compartment satisfies a second target temperature;
• in response to the freezer compartment not reaching the first target temperature and the refrigerating compartment not reaching the second target temperature, controlling the switch valve such that the non-azeotropic mixed refrigerant flows to the first evaporator and the second evaporator;
• in response to the freezer compartment reaching the first target temperature and the refrigerating compartment not reaching the second target temperature, controlling the switch valve such that the non-azeotropic mixed refrigerant flows to the second evaporator supplying cold air to a refrigerating compartment without passing through the first evaporator supplying cold air to a freezer compartment;
• and
• in response to the freezer compartment reaching a first target temperature and the refrigerating compartment reaching the second target temperature, stopping the compressor and closing the flow non-azeotropic mixed refrigerant by the switch valve.