A refrigerator includes a storage space, a freezing chamber defining an insulating space configured to maintain a chamber temperature independent from the storage space, an evaporator in the storage space, a grill pan assembly that defines an evaporator space configured to accommodate the evaporator and at least a portion of the storage space, a thermoelectric element assembly including a thermoelectric element, a heat sink, and a cold sink to cool the freezing chamber to a temperature less than the temperature of the storage space, a module accommodation portion located at a side of the grill pan assembly, a defrost water guide that communicates with the module accommodation portion and the evaporator space and that is configured to discharge defrost water generated during a defrost operation of the freezing chamber, and a defrost heater located in the module accommodation portion and configured to melt ice during the defrost operation.

A refrigerator that includes: a storage space configured to be cooled by a refrigeration cycle cooling system; a wall defines a boundary of the storage space; a low temperature case that is arranged adjacent to a portion of a first surface of the wall; a thermoelectric element module (TEM) assembly that is configured to supply cool air to the low temperature case; and a TEM accommodating part that protrudes from the first surface of the wall and that accommodates the TEM assembly, wherein the low temperature case includes an opening through which the TEM accommodating part is inserted, and wherein a sealant is provided between the low temperature case and the wall to couple the low temperature case to the first surface of the wall is disclosed.

An auxiliary thermosiphon has an auxiliary refrigerant conduit with an auxiliary evaporation segment in thermally conductive connection to an interior wall of the freezer. The auxiliary refrigerant conduit contains an auxiliary refrigerant that is isolated from the primary refrigerant of the primary cooling apparatus. The auxiliary refrigerant conduit also extends upward to an auxiliary condensation segment of the auxiliary refrigerant conduit at an elevation above the auxiliary evaporation segment. A thermal bridge is in physical thermal contact with the auxiliary condensation segment and in physical thermal contact with a portion of a primary evaporation segment of the primary refrigeration apparatus. Heat is transported through the thermal bridge from the auxiliary thermosiphon to the primary refrigerant conduit and consequently to the primary refrigeration apparatus for removal from the freezer.

Provided is a refrigerator. The refrigerator includes a main body defining a storage space, a cryogenic freezing compartment provided in the storage space, and a thermoelectric module assembly disposed at one side of the cryogenic freezing compartment so that the cryogenic freezing compartment is cooled to a temperature less than that of the storage space. The cryogenic freezing compartment includes a cryogenic case into which an insulation material is filled to be thermally insulated from the storage space and in which a cryogenic freezing space is defined, a case door opening and closing the cryogenic case, and a rail assembly connecting the cryogenic case to the case door and extending and contracted in multi-stages to allow the case door to be slid to be inserted and withdrawn. The rail assembly is mounted on the cryogenic case outside the cryogenic freezing space.

A method of controlling a refrigerator may include operating a first cooling cycle for a first storage compartment to drive a compressor and operating a first cooling fan for cooling the first storage compartment, and switching to a second cooling cycle for cooling a second storage compartment to drive the compressor and operating a second cooling fan for cooling the second storage compartment when a stop condition of the first cooling cycle is satisfied. The method may also include switching to a third cooling cycle for cooling the first storage compartment to drive the compressor and operating the first cooling fan when a stop condition of the second cooling cycle is satisfied.

A caloric heat pump system includes a pump is operable to circulate a working fluid through a stage. The pump includes a motor. A cam is coupled to the motor such that the cam is rotatable by the motor. The cam has a non-circular outer profile surface. Each piston of a pair of pistons has a cam follower positioned on the non-circular outer profile surface of the cam.

A refrigerator of the present invention includes a refrigeration system having a water-cooled condenser and a liquid line heat exchanger for additional cooling with the water, at a position upstream in the direction of flow of water from the cooling that occurs at the condenser. The use of water cooling at these two portions of the refrigeration system improves the energy efficiency of the refrigerator, while also significantly improving temperature responsiveness (e.g., reducing an amount of time necessary to pull down the temperature of a cooled space in the refrigerator to a desired set point temperature). The refrigerator may include one or a plurality of refrigeration stages, in various embodiments, and an additional sub-cooling heat exchanger may be provided in the refrigeration system downstream from the liquid line heat exchanger when the refrigerator includes multiple cascaded circuits.

A refrigeration device includes: a refrigerator; a heat pipe that includes a condensation unit connected to the refrigerator and adapted to condense a refrigerant, includes an evaporation unit connected to a storage chamber and adapted to evaporate the refrigerant, and includes a piping for circulating the refrigerant between the condensation unit and the evaporation unit; a heat pipe temperature sensor that detects a temperature of the heat pipe; and a control unit that controls driving of the refrigerator based on a result of detection by the heat pipe temperature sensor. The control unit controls the refrigerator so that the temperature of the heat pipe does not fall below a standard boiling temperature of the refrigerant.

A transport refrigeration system (TRS) and method of operating a TRS having a sorption subsystem are disclosed. The TRS includes a refrigeration subsystem and a sorption subsystem. The refrigeration subsystem includes a refrigerant, a compressor, a refrigerant condenser, a refrigerant expansion device, and a refrigerant evaporator in fluid communication such that the refrigerant can flow therethrough. The sorption subsystem includes a heat transfer fluid, a heat source, a boiler, a sorption condenser, a sorption expansion valve, a sorption evaporator, and a pump in fluid communication such that the heat transfer fluid can flow therethrough. The sorption evaporator is in thermal communication with the refrigeration subsystem.

A refrigerator includes a cabinet in which a storage space is formed; a main evaporator which is installed at one side of an inner portion of the storage space to cool the storage space; a case which is installed on the other side the inner portion of the storage space and defines a deep-freezing storage chamber; a drawer which is accommodated in the case so as to be retractable and withdrawable and in which food is stored; and a rapid cooling module which is provided on a rear side of the inner portion of the case and rapidly cools the deep-freezing storage chamber, in which the rapid cooling module may includes an auxiliary evaporator; and a thermoelectric device which is coupled to the auxiliary evaporator and cools the deep-freezing storage chamber through heat exchange by heat conduction.