The present disclosure relates to a heating, ventilation, and air conditioning (“HVAC”) system include a supply damper, a return damper, and a defrost damper which are operable to control a supply airflow, a return airflow, and a defrost airflow to flow between a supply duct, a return duct, and an indoor heat exchanger without substantially flowing into and substantially cooling an indoor space. A reheat coil may also warm the supply air flow and a defrost return line may be used to bypass a bi-flow expansion device and an indoor heat exchanger.

A cooling system comprising a cooling circuit connecting a heat exchanger and a heat load. The cooling system comprising a first velocity fuse upstream of the heat exchanger or heat load and a second velocity fuse or valve downstream of the heat exchanger or heat load. The heat exchanger or heat load is dynamically isolated from the rest of the cooling system by the first velocity fuse or the second velocity fuse in response to a velocity of a flow of cooling fluid exceeding a respective velocity setting of the first velocity fuse or the second velocity fuse.

The present invention discloses the use of two-phase ejector(s) activated by pressurized refrigerant, said two-phase ejector(s) are strategically located in the cycle of the refrigeration system so as to provide part of the compression effect required for the refrigeration load, thereby relieving the conventional mechanical compressor from part of its duty, hence increasing the overall cycle efficiency of the refrigeration system.

An intermediate refrigerant store of a refrigerant system may include a storage container delimiting a refrigerant storage space, a first feed, and a second feed separate from the first feed. The first feed and the second feed may be fluidically connected with the refrigerant storage space for feeding of a refrigerant. At least one discharge may be fluidically connected to the refrigerant storage space and may be configured to discharge the refrigerant from the refrigerant storage space. At least one valve arrangement may be disposed in an associated feed of the first feed and the second feed via which the associated feed may be fluidically closable and openable.

A battery temperature control system includes: a refrigeration cycle including a compressor and a heat exchanger; an accumulator; a condenser; a bypass for supplying refrigerant discharged from the compressor to the heat exchanger while bypassing the condenser; a valve mechanism; a temperature detector; a controller configured to switch the valve mechanism; and an introduction passage branched off from a passage extending from a discharge port of the compressor to a position in the refrigeration cycle upstream of the heat exchanger. The introduction passage supplies the refrigerant reduced in pressure to a part of a passage extending from a position in the refrigeration cycle downstream of the accumulator or downstream of the heat exchanger to a position in the refrigeration cycle upstream of the accumulator. The controller adjusts an opening degree of the variable throttle disposed in the introduction passage depending on a temperature detected by the temperature detector.

A refrigerant leakage determination system capable of detecting leakage of refrigerant without requiring complicated processing is provided. A refrigerant leakage determination system is a refrigerant leakage determination system of a refrigeration cycle apparatus that includes a refrigerant circuit including a heat-source-side heat exchanger and has, as operating modes, a normal mode in which the heat-source-side heat exchanger is caused to function as an evaporator and a defrosting mode in which the heat-source-side heat exchanger frosted during a normal operation is defrosted. The refrigerant leakage determination system includes a processor configured to acquire defrosting information regarding a relationship between a normal operation period and the number of defrosting operations, and memory that stores the defrosting information. The processor is further configured to determine, based on the acquired defrosting information, leakage of refrigerant in the refrigerant circuit.

The invention relates to a refrigerant for a cooling device (10) comprising a cooling circuit (11) comprising at least one heat exchanger (12), the refrigerant undergoing a phase transition in the heat exchanger, the refrigerant being a refrigerant mixture composed of a fraction of carbon dioxide (CO.sub.2), a fraction of 1,1-difluoroethene and a fraction of at least one other component, wherein the fraction of carbon dioxide in the refrigerant mixture is 45 to 90 mole percent, the fraction of 1,1-difluoroethene being 5 to 40 mole percent.

An air conditioner is provided that may include a compressor that compresses a refrigerant; a condenser that condenses the refrigerant discharged from the compressor; at least one expansion valve that expands the refrigerant passing through the condenser; a gas-liquid separator, through which the refrigerant passed through the at least one expansion valve flows, that separates and discharges the refrigerant into gas refrigerant and liquid refrigerant; an evaporator that evaporates the liquid refrigerant discharged from the gas-liquid separator; a refrigerant inflow pipe that connects the expansion valve and the gas-liquid separator; a bypass pipe that connects the gas-liquid separator and the compressor; and a refrigerant discharge pipe that connects the gas-liquid separator and the evaporator. The gas-liquid separator may include a housing in which a portion of each of the refrigerant inflow pipe, the bypass pipe, and the refrigerant discharge pipe may be disposed; a first partition wall, which is disposed in an internal space of the housing and includes a first opening formed by cutting out a portion of an outer surface thereof disposed adjacent to the refrigerant inflow pipe, and a second partition wall, which is spaced apart from the first partition wall and disposed in the internal space of the housing and includes a second opening formed by cutting out a portion of an outer surface thereof disposed adjacent to the refrigerant discharge pipe.

A refrigeration system includes a compressor, a condenser, a heat transfer component, and a refrigerant loop arranged to allow a flow of a refrigerant fluid. The compressor, the condenser, and the heat transfer component are connected in the refrigerant loop. The system further includes a bypass path extending between an output side of the compressor in the refrigerant loop and an input side of the heat transfer component in the refrigerant loop. A bypass valve is connected in the bypass path. A control circuit is in communication with the bypass valve. The control circuit is configured to open the bypass valve to allow the refrigerant fluid to pass to the heat transfer component thereby increasing the refrigerant fluid provided to the heat transfer component and artificially increasing a load on the refrigeration system. Other examples refrigeration system and examples methods are also disclosed.

There are a first coolant circuit that supplies a first coolant in a first tank to a first load, a second coolant circuit that supplies a second coolant in a second tank to a second load, and a refrigeration circuit that adjusts temperatures of the first and second coolants to set temperatures by heat exchange between the first and second coolants and refrigerants by using heat exchangers. The set temperature of the second coolant is equal to the set temperature of the first coolant or higher than the set temperature of the second coolant, and the set flow rate of the first coolant is higher than the set flow rate of the second coolant, and the volume of the first tank is larger than the volume of the second tank.