A controller for a CO2 refrigeration system includes at least one input configured to receive an inlet air temperature from a first temperature sensor, an exit temperature from a second temperature sensor and an exit pressure from a pressure sensor, at least one output for controlling the valve and the fan, a memory, and a processor. The processor is configured by instructions stored in the memory to receive, through the at least one input, the inlet air temperature from the first temperature sensor, and control, through the at least one output, the valve and the fan based on the inlet air temperature both when the CO2 refrigeration system is operating in a transcritical mode and when the CO2 refrigeration system is operating in a subcritical mode.

[Object] An electric valve control device capable of preventing a start delay of an electric valve control (an opening degree control) by shortening a waiting period of a system control device and an electric valve device including the same are provided.

[Solving Means] An electric valve control device 11 outputs a signal indicating an end or an interruption of an initialization operation to an air conditioner ECU 16 after the initialization operation of the electric valve 9 ends or is interrupted.

An ejector includes a nozzle, a swirl flow generation portion, a body including a refrigerant suction port and a diffuser portion, a passage forming member, and an actuation device moving the passage forming member. A nozzle passage is defined between the nozzle and the passage forming member. A smallest passage cross-sectional area portion is provided in the nozzle passage. A swirl space that has a shape of a revolution and is coaxial with the nozzle, and a refrigerant inflow passage through which the refrigerant flows into the swirl space are defined in the swirl flow generation portion. The ejector further includes an area adjustment device that changes the passage cross-sectional area of the refrigerant inflow passage. According to this, an efficiency of energy conversion in the nozzle passage can be improved.

An ejector includes a nozzle, a swirl flow generation portion, a body including a refrigerant suction port and a diffuser portion, a passage forming member, and an actuation device moving the passage forming member. A nozzle passage is defined between the nozzle and the passage forming member. A smallest passage cross-sectional area portion is provided in the nozzle passage. A swirl space that has a shape of a revolution and is coaxial with the nozzle, and a refrigerant inflow passage through which the refrigerant flows into the swirl space are defined in the swirl flow generation portion. The ejector further includes an area adjustment device that changes the passage cross-sectional area of the refrigerant inflow passage. According to this, an efficiency of energy conversion in the nozzle passage can be improved.

There is provided that a cooling device for cooling a cooling target, including a circulation system configured to circulate a refrigerant for cooling the cooling target, wherein a container including a region where heat is exchanged between the refrigerant and at least a part of the cooling target is provided in the circulation system, the refrigerant is a mixed refrigerant obtained by mixing a first refrigerant of a first boiling point and a second refrigerant of a second boiling point higher than the first boiling point, the circulation system circulates the mixed refrigerant so that the mixed refrigerant enters the container at a predetermined temperature, and the first refrigerant has a vapor pressure higher than a pressure resistance of the container at the predetermined temperature.

There is provided that a cooling device for cooling a cooling target, including a circulation system configured to circulate a refrigerant for cooling the cooling target, wherein a container including a region where heat is exchanged between the refrigerant and at least a part of the cooling target is provided in the circulation system, the refrigerant is a mixed refrigerant obtained by mixing a first refrigerant of a first boiling point and a second refrigerant of a second boiling point higher than the first boiling point, the circulation system circulates the mixed refrigerant so that the mixed refrigerant enters the container at a predetermined temperature, and the first refrigerant has a vapor pressure higher than a pressure resistance of the container at the predetermined temperature.

An ejector mixer has a convergent section and a downstream divergent section downstream of the convergent section. The downstream divergent section has a divergence half angle of 0.1-2.0 over a first span of at least 3.0 times a minimum diameter of the mixer.

An ejector mixer has a convergent section and a downstream divergent section downstream of the convergent section. The downstream divergent section has a divergence half angle of 0.1-2.0 over a first span of at least 3.0 times a minimum diameter of the mixer.

Systems and methods for natural gas liquefaction capacity augmentation using supplemental cooling systems and methods to improve the efficiency of a liquefaction cycle for producing liquefied natural gas (LNG).

A refrigeration circuit includes one first compressor, a first gas-cooler, connected to the first compressor through a common discharge line, a medium temperature expansion valve, a medium temperature heat exchanger, a liquid receiver that is connected to an outlet liquid line that splits in a first liquid line that connects with the medium temperature heat exchanger and a second liquid line that has a first expansion valve, to a first pressure reduction valve and to a first heat exchanger. The refrigerant flowing through the second liquid line is also mixed with the refrigerant from the first liquid line leaving the medium temperature heat exchanger and the mixture enters the first heat exchanger to exchange heat with the refrigerant in the first liquid line to be directed to the first compressor through a suction line.