A freezer case includes a refrigeration system and a controller. The controller is configured to store a plurality of setpoint instruction sets associated with a plurality of possible operating modes, select a current operating mode from the plurality of possible operating modes, assign a value for the superheat setpoint by executing the setpoint instruction set associated with the current operating mode, control the refrigeration system in accordance with the superheat setpoint.

A heat pump system and a control method thereof. The heat pump system includes: a compressor; an indoor heat exchanger; an outdoor heat exchanger configured as an interlaced heat exchanger having at least two refrigerant flow paths; a plurality of throttling elements; and a first type four-way valve and a second type four-way valve; in a local defrosting mode, refrigerant flows sequentially from the exhaust port of the compressor through at least one of the at least two refrigerant flow paths of the outdoor heat exchanger, the throttling element, at least another of the at least two refrigerant flow paths of the outdoor heat exchanger and the suction port of the compressor.

A method for determining a time frame for when a freezer having a compressor should be defrosted include the steps of measuring compressor cycling over time, determining a change in compressor cycling over time, and determining from the change in in compressor cycling over time determined a time frame for when the freezer should be defrosted.

A refrigerator including a main body including a storeroom; an evaporator arranged in the back of the storeroom and configured to generate cold air; a defrost heater arranged under the evaporator into which air flows and configured to remove frost or ice formed on the evaporator; a temperature sensor arranged on the top of the evaporator and configured to measure temperature; and a controller configured to stop operation of the defrost heater in a first defrost cycle based on a first measurement measured by the temperature sensor and stop operation of the defrost heater in a second defrost cycle based on a second measurement, which is different from the first measurement.

According to one embodiment, a motor drive unit includes a motor including a plurality of phase windings in a mutually unconnected state, a first inverter which controls application of electric power to one ends of the phase windings, a second inverter which controls application of electric power to the other ends of the phase windings, relays each of which includes a make break contact connected between the other ends of the phase windings, and a controller which switches, according to a value of a current flowing through the motor, between an open-windings mode and a star-connection mode.

There is disclosed a controlling method for a refrigerator comprising: a first defrosting step of performing defrosting for an evaporator, the first defrosting step which ends when the temperature of the evaporator reaches a first temperature; a pressure difference sensing step of measuring a difference between the pressure in a first through-hole arranged between an inlet hole for drawing air from a storage compartment and the evaporator and the pressure in a second through-hole arranged between an outlet hole for discharging air towards the storage compartment and the evaporator by using one differential pressure sensor; and a second defrosting step of performing additional defrosting for the evaporator when the measured pressure difference is a preset pressure or more.

The invention discloses a freezer frame comprising a frame body, the frame body includes a low-temperature part and a heating part, and a panel installed in cooperation with the frame is provided on the heating part, characterized in that, a light source is provided on the low-temperature part, and a heat conduction channel is provided between the light source and the heating part. The freezer frame and the freezer of the present invention use the heat of the light source for lighting to heat the panel to prevent the panel from fogging and generating condensed water, prevent the freezer door and frame from freezing, and simplify the structure to reduce energy consumption and manufacturing costs.

The invention discloses a freezer frame comprising a frame body, the frame body includes a low-temperature part and a heating part, and a panel installed in cooperation with the frame is provided on the heating part, characterized in that, a light source is provided on the low-temperature part, and a heat conduction channel is provided between the light source and the heating part. The freezer frame and the freezer of the present invention use the heat of the light source for lighting to heat the panel to prevent the panel from fogging and generating condensed water, prevent the freezer door and frame from freezing, and simplify the structure to reduce energy consumption and manufacturing costs.

A refrigerator of the present invention comprises: an inner case forming a storage compartment; a cold air duct guiding the flow of air within the storage compartment and forming a heat exchange space with the inner case; an evaporator disposed in the heat exchange space between the inner case and the cold air duct; a bypass passage disposed in the cold air duct so as to allow the flow of air to bypass the evaporator; a sensor disposed in the bypass flow channel and comprising a sensor housing, a sensor PCB received in the sensor housing, a heating element installed on the sensor PCB so as to generate heat when an electric current is applied thereto, a temperature element for sensing the temperature of the heating element, and a molding material with which the sensor housing is filled; a drfrosting means for removing frost formed on the surface of the evaporator; and a control unit for controlling the defrosting means on the basis of the value output from the sensor.

The present invention discloses a method of controlling an air-cooling device and an air-cooling device. The air-cooling device enables two chambers to achieve simultaneous refrigeration, to achieve simultaneous heating, or to achieve refrigeration in one chamber and heating in the other chamber by employing a structural design with a single evaporator+a single evaporation blower+two dampers+three heating wires, in conjunction with the control of operational relationship of the compressor, the evaporation blower, the heating wires and the dampers; in conjunction with the control in the above three manners, the thermostatic control of the air-cooling device with a single refrigeration system and dual temperature zones is achieved with a simple structure and process.