An air-cooled and ventilated heat exchanger includes a fin and a plurality of heat transfer tubes. The fin has a plate-shaped part and a plurality of protruding parts. The plate-shaped part is positioned so that a plate-thickness direction intersects an air-flow direction generated by ventilation, and the protruding parts protrude from the plate-shaped part in the plate-thickness direction. The heat-transfer tubes are-inserted into the fin so as to intersect the air-flow direction. The protruding parts have a first protruding part and a second protruding part. An inclination angle of the first protruding part with respect to the plate-shaped part is a first angle, an inclination angle of the second protruding part with respect to the plate-shaped part is a second angle, and the second angle is different from the first angle. The second protruding part is placed adjacent to the first protruding part.

A refrigeration appliance includes a refrigeration circuit having a condenser and a heat circulation system for heating an element of the refrigeration appliance. The heat circulation system includes a heat conducting region. A heat exchanging element includes the condenser and the heat conducting region. The condenser and the heat conducting region in the heat exchanger element are thermally coupled in order to output heat from the refrigeration circuit to the heat conducting region of the heat circulation system.

A defrosting device includes a heating unit filled with a working fluid and including an active heating part heated to a first temperature that can evaporate the working fluid, and a passive heating part positioned at a rear side of the active heating part and heated to a lower temperature than the first temperature. The defrosting device also includes a heat pipe disposed adjacent to an evaporator to transfer heat to the evaporator while circulating working fluid heated by the active heating part, the heat pipe including an entrance portion configured to receive working fluid evaporated by the active heating part, and a return portion connected adjacent to the passive heating part and configured to receive working fluid that has condensed after circulating through the heat pipe. Condensed working fluid received at the heating unit first passes through the passive heating part before being reheated at the active heating part.

A refrigerator is provided that includes a low energy defrost system and method for melting frost formed on an evaporator of a cooling system for the refrigerator. The low energy defrost system includes using air from the refrigerator compartment or external air adjacent the refrigerator to be directed to the evaporator and passed adjacent the evaporator coils to melt any frost formed thereon. As the air is above freezing temperature, it will melt any frost formed on the coils without the need of use an electrical heater. Re-cooled air from the melted frost may then be directed back into the refrigerator compartment to be used to aid in cooling the refrigerator compartment or keeping the refrigerator compartment at the programmed or predetermined temperature.

A refrigerator is provided that includes a low energy defrost system and method for melting frost formed on an evaporator of a cooling system for the refrigerator. The low energy defrost system includes using air from the refrigerator compartment or external air adjacent the refrigerator to be directed to the evaporator and passed adjacent the evaporator coils to melt any frost formed thereon. As the air is above freezing temperature, it will melt any frost formed on the coils without the need of use an electrical heater. Re-cooled air from the melted frost may then be directed back into the refrigerator compartment to be used to aid in cooling the refrigerator compartment or keeping the refrigerator compartment at the programmed or predetermined temperature.

A dehumidifying apparatus controls the amount of refrigerant flowing into a third heat exchanger serving as a condenser, so as to secure the amount of heat required for defrosting.

A dehumidifying apparatus controls the amount of refrigerant flowing into a third heat exchanger serving as a condenser, so as to secure the amount of heat required for defrosting.

A domestic refrigeration appliance device, in particular a domestic freezer appliance device, includes a frame unit provided for at least partially delimiting an access opening. The frame unit includes at least one frame sub-element having at least one groove running at least substantially parallel to a main direction of extension of the frame sub-element. In order to improve reliability, the frame sub-element has at least two cross-sectional shapes differing substantially from one another in a subregion relative to the main direction of extension. A domestic refrigeration appliance, in particular a domestic freezer appliance, and a method for manufacturing a domestic refrigeration appliance device, in particular a domestic freezer appliance device, are also provided.

A freezing and refrigerating device comprises a box body and a door body. An air supply path supplying cooling air flow to a storage compartment, an air return path enabling the air flow from the storage compartment to pass, a cooling chamber and a defrosting air return path are defined in the box body, wherein the cooling chamber is provided with an air feeding opening part and an air return opening part and contains an evaporator, a blower and a defrosting heater, and the defrosting air return path is communicated with the air feeding opening part and the air return opening part of the cooling chamber. The air supply path and the defrosting air return path are provided with an air supply door and a defrosting air return door respectively. The present invention further provides a defrosting control method of the freezing and refrigerating device.

A freezing and refrigerating device comprises a box body and a door body. An air supply path supplying cooling air flow to a storage compartment, an air return path enabling the air flow from the storage compartment to pass, a cooling chamber and a defrosting air return path are defined in the box body, wherein the cooling chamber is provided with an air feeding opening part and an air return opening part and contains an evaporator, a blower and a defrosting heater, and the defrosting air return path is communicated with the air feeding opening part and the air return opening part of the cooling chamber. The air supply path and the defrosting air return path are provided with an air supply door and a defrosting air return door respectively. The present invention further provides a defrosting control method of the freezing and refrigerating device.