A system and method are provided including a system controller for a refrigeration or HVAC system having a compressor rack with a compressor and a condensing unit with a condenser fan. The system controller monitors and controls operation of the refrigeration or HVAC system. A rack controller monitors and controls operation of the compressor rack and determines compressor rack power consumption data. A condensing unit controller monitors and controls operation of the condensing unit and determines condensing unit power consumption data. The system controller receives the compressor rack power consumption data and the condensing unit power consumption data, determines a total power consumption of the refrigeration or HVAC system, determines a predicted power consumption or a benchmark power consumption for the refrigeration system, compares the total power consumption with the predicted power consumption or the benchmark power consumption, and generates an alert based on the comparison.

A refrigeration cycle apparatus includes a compressor, a utilization-side heat exchanger, a heat source-side expansion valve, a heat source-side heat exchanger, an accumulator, and a main refrigerant circuit. A non-azeotropic refrigerant mixture is sealed in the main refrigerant circuit. A first value obtained by dividing a value obtained by subtracting a second amount from a first amount by the first amount exceeds a value determined in accordance with a mixed refrigerant. The first amount is an amount of the mixed refrigerant sealed in the main refrigerant circuit. The second amount is an amount of a liquid refrigerant stored in the accumulator.

A refrigerator includes a main body including at least one storage chamber, doors provided to open or close the at least one storage chamber, a thermoelectric module for cooling down the at least one storage chamber, and at least one processor configured to control the thermoelectric module, where the thermoelectric module includes internal elements classified into a plurality of groups, the internal elements in each of the plurality of groups are connected to each other in series, and the plurality of groups are connected in parallel with each other to a power line connected to the thermoelectric module.