A refrigeration appliance, especially domestic refrigeration appliance, includes a compressor, a condenser, at least a first evaporator, a suction line from the first evaporator to the compressor, at least one heat exchanger switchable between condenser operation and evaporator operation, and a valve arrangement switching the heat exchanger between an evaporator operating state, having a switchable heat exchanger inlet connected to the condenser through a first choke point and a switchable heat exchanger outlet connected to the first evaporator, and a condenser operating state, having the switchable heat exchanger outlet connected to the evaporator through a second choke point. A first supply line for supplying refrigerant in the evaporator operating state and a second supply line, separate therefrom, for supplying refrigerant in the condenser operating state, are associated with the switchable heat exchanger. Only the first supply line is connected with the suction line, forming an external heat exchanger.

Example implementations relate to a leak mitigation (LM) system. The LM system may include a collection tank, a first valve unit coupled to the collection tank, a second valve unit coupled to a cooling loop carrying a coolant, and an LM pump coupled between the first valve unit and the second valve unit. Moreover, the leak mitigation system may also include a controller operatively coupled to the first valve unit, the second valve unit, and the LM pump to operate, in an event of a leak of the coolant from the cooling loop, the first valve unit, the second valve unit, and the LM pump to transfer at least a portion of the coolant to the collection tank from the cooling loop via the second valve unit and the first valve unit.

Example implementations relate to a leak mitigation (LM) system. The LM system may include a collection tank, a first valve unit coupled to the collection tank, a second valve unit coupled to a cooling loop carrying a coolant, and an LM pump coupled between the first valve unit and the second valve unit. Moreover, the leak mitigation system may also include a controller operatively coupled to the first valve unit, the second valve unit, and the LM pump to operate, in an event of a leak of the coolant from the cooling loop, the first valve unit, the second valve unit, and the LM pump to transfer at least a portion of the coolant to the collection tank from the cooling loop via the second valve unit and the first valve unit.

A thermal management system includes a closed-circuit refrigeration system that includes a closed-circuit refrigerant fluid path configured to store a refrigerant fluid; and an absorber/desorber including a bidirectional port coupled to the closed-circuit refrigerant fluid path to regulate an amount of refrigerant vapor at a compressor inlet of the closed-circuit refrigeration system. The absorber/desorber is configured to store an ionic liquid that is configured to absorb or desorb at least a portion of the refrigerant vapor based on a mode of operation of the absorber/desorber.

A thermal management system includes a closed-circuit refrigeration system that includes a closed-circuit refrigerant fluid path configured to store a refrigerant fluid; and an absorber/desorber including a bidirectional port coupled to the closed-circuit refrigerant fluid path to regulate an amount of refrigerant vapor at a compressor inlet of the closed-circuit refrigeration system. The absorber/desorber is configured to store an ionic liquid that is configured to absorb or desorb at least a portion of the refrigerant vapor based on a mode of operation of the absorber/desorber.

A thermal management system includes a closed-circuit refrigeration system that includes a vapor cycle system (VCS) and a liquid pumping system (LPS). The VCS includes a receiver that stores a refrigerant fluid and a liquid separator. The vapor cycle system is configured to operate in one or more operational modes including at least one of a TES cooling mode, a heat load cooling mode, or a pump-down mode. The LPS includes a thermal energy storage (TES) that stores a phase change material (PCM) and a pump fluidly coupled to at least one evaporator. The evaporator is configured to extract heat from a heat load that is in thermal conductive or convective contact to the evaporator to transfer heat to the refrigerant fluid and provide the refrigerant fluid from an evaporator outlet to the TES.

A thermal management system includes a closed-circuit refrigeration system that includes a vapor cycle system (VCS) and a liquid pumping system (LPS). The VCS includes a receiver that stores a refrigerant fluid and a liquid separator. The vapor cycle system is configured to operate in one or more operational modes including at least one of a TES cooling mode, a heat load cooling mode, or a pump-down mode. The LPS includes a thermal energy storage (TES) that stores a phase change material (PCM) and a pump fluidly coupled to at least one evaporator. The evaporator is configured to extract heat from a heat load that is in thermal conductive or convective contact to the evaporator to transfer heat to the refrigerant fluid and provide the refrigerant fluid from an evaporator outlet to the TES.

An air conditioning heat dissipation structure control method and a system includes the steps obtaining a real-time temperature Te of the heat generating component; if T.sub.e>T.sub.e.sup.d, opening the solenoid valve SV2 and adjusting the electronic expansion valve 4 to a preset initial opening degree; obtaining an update real-time temperature T.sub.e of the heat generating component after a setting time period; if the update real-time temperature T.sub.e>T.sub.max, performing the following steps every set period of time, obtaining a refrigerant temperature refrigerant temperature T.sub.in at the inlet end of the refrigerant heat dissipation pipe and a refrigerant temperature T.sub.out at the outlet end of the refrigerant heat dissipation pipe; calculating a real-time temperature difference ΔT.sub.real-time of the inlet end temperature T.sub.in and the outlet end temperature T.sub.out, wherein ΔT.sub.real-time=T.sub.out−T.sub.in, obtaining a preset target temperature difference ΔT.sub.target and calculating a deviation ΔT.sub.deviation, ΔT.sub.deviation=ΔT.sub.real-time−ΔT.sub.target; calculating a deviation change rate ΔΔT.sub.deviation=ΔT.sub.deviation−ΔT.sub.deviation′, and adjusting the opening degree of the electronic expansion valve based on the deviation ΔT.sub.deviation and the deviation change rate ΔΔT.sub.deviation, enables the temperature difference between the inlet end and the outlet end of the refrigerant heat dissipation pipe reaches the target temperature difference so as to ensure a good heat dissipation effect and keep the heat generating component working in a good condition and also lowers the cost by using refrigerant for transferring heat from the heat generating component. With the method, the reliability and stability of the air conditioning operation are improved, and the problem of poor heat dissipation reliability and high heat dissipation cost in the prior art is solved.

An air conditioning heat dissipation structure control method and a system includes the steps obtaining a real-time temperature Te of the heat generating component; if T.sub.e>T.sub.e.sup.d, opening the solenoid valve SV2 and adjusting the electronic expansion valve 4 to a preset initial opening degree; obtaining an update real-time temperature T.sub.e of the heat generating component after a setting time period; if the update real-time temperature T.sub.e>T.sub.max, performing the following steps every set period of time, obtaining a refrigerant temperature refrigerant temperature T.sub.in at the inlet end of the refrigerant heat dissipation pipe and a refrigerant temperature T.sub.out at the outlet end of the refrigerant heat dissipation pipe; calculating a real-time temperature difference ΔT.sub.real-time of the inlet end temperature T.sub.in and the outlet end temperature T.sub.out, wherein ΔT.sub.real-time=T.sub.out−T.sub.in, obtaining a preset target temperature difference ΔT.sub.target and calculating a deviation ΔT.sub.deviation, ΔT.sub.deviation=ΔT.sub.real-time−ΔT.sub.target; calculating a deviation change rate ΔΔT.sub.deviation=ΔT.sub.deviation−ΔT.sub.deviation′, and adjusting the opening degree of the electronic expansion valve based on the deviation ΔT.sub.deviation and the deviation change rate ΔΔT.sub.deviation, enables the temperature difference between the inlet end and the outlet end of the refrigerant heat dissipation pipe reaches the target temperature difference so as to ensure a good heat dissipation effect and keep the heat generating component working in a good condition and also lowers the cost by using refrigerant for transferring heat from the heat generating component. With the method, the reliability and stability of the air conditioning operation are improved, and the problem of poor heat dissipation reliability and high heat dissipation cost in the prior art is solved.

A HVAC system having an indoor heat exchanger having a first refrigerant passage extending in a first direction and a second refrigerant extending in a second direction opposite from the first direction, a first refrigerant circuit comprising a first compressor, a first expansion valve, a first outdoor heat exchanger, the first refrigerant passage, and a first reversing valve operable to control a direction of first refrigerant in the first refrigerant circuit, and a second refrigerant circuit comprising a second compressor, a second expansion valve, a second outdoor heat exchanger, the second refrigerant passage, and a second reversing valve operable to control a direction of second refrigerant in the second refrigerant circuit.