Abstract: A heat exchanger configured to cause a refrigerant to exchange heat with a heat medium, includes: plates stacked on top of one another. A first flow path and a second flow path are formed between the plates. The refrigerant in a two phase state flows through the first flow path and the heat medium flows through the second flow path. Each of the plates includes: a first inlet from which the refrigerant flows into the first flow path; and a first outlet from which the refrigerant flows out of the first flow path. In each of the plates, when viewed in a direction in which the plates are stacked, the first inlet has line symmetry with respect to a center line in a width direction of the each of the plates, and the first outlet has line symmetry with respect to the center line.

Abstract: A copolymer having a structure derived from 1,2-difluoroethylene, and a formed article thereof is provided. A copolymer contains a structural unit (A) derived from 1,2-difluoroethylene, a structural unit (B) derived from tetrafluoroethylene, and a structural unit (C) represented by the following structural formula (1): In structural formula (1), R1 is fluorine, a partly or wholly fluorinated hydrocarbon group having 5 or less carbon atoms, or OR5 group. R5 group is a partly or wholly fluorinated hydrocarbon group having 5 or less carbon atoms and R2, R3 and R4 are each independently hydrogen or fluorine. A copolymerization ratio between the structural unit (A) and the structural unit (B) is 10/90 to 85/15 mol %. A content of the structural unit (C) is 0.1 to 30 mol % relative to the total amount of resin.

Abstract: A compressor is a compressor for a refrigeration cycle apparatus that performs a refrigeration cycle using a refrigerant containing a hydrofluoroolefin and a refrigeration oil containing a polyol ester or a polyvinyl ether. The compressor includes a sliding portion. The sliding portion is formed of an aluminum alloy containing from 5 wt % to 25 wt % of silicon. The refrigeration oil contains an acid scavenger or an oxygen scavenger and satisfies the following relational formula: total content (wt %) of acid scavenger and oxygen scavenger in refrigeration oil?(2.3+2.6×(hydrofluoroolefin content (wt %) in refrigerant)?1.6×(silicon content (wt %) in sliding portion))/100.

Abstract: In an air conditioner, during an operation, a gas-liquid two-phase non-azeotropic mixture refrigerant enters a receiver and accumulates in the receiver in a state where a gas phase and a liquid phase are separated. For example, when the non-azeotropic mixture refrigerant includes two components, i.e., a high-boiling refrigerant and a low-boiling refrigerant, the controller may estimate the ratio (composition ratio) between the low-boiling refrigerant and the high-boiling refrigerant in each of the gas phase and the liquid phase based on the temperature and the pressure of the non-azeotropic mixture refrigerant in the receiver. Thus, the controller may estimate the composition ratio of the liquid-phase non-azeotropic mixture refrigerant flowing out of the receiver as the composition ratio of the non-azeotropic mixture refrigerant circulating in the refrigerant circuit.

Abstract: A humidifier includes a casing, an air passage, a humidifying section, a tray to supply water to the humidifying section, a tank to supply water to the tray, a water supply port, an openable and closable door, and an overflow control mechanism. The water supply port supplies water from outside into the tank. The water supply port is exposed to outside of the casing, is disposed inside the door, is provided in the tank, and shifts between a first position exposed to the outside of the casing when supplying the water, and a second position housed in the casing when supplying no water. The door is open in the first position, and closed in the second position. The tank is turnably supported by the casing. The water supply port shifts between the first position and the second position when the tank turns.

Abstract: A plate-type refrigerant pipe includes: a first plate; and a second plate. The first plate and the second plate are joined to form a refrigerant flow path. The first plate includes a first connection portion to which a first refrigerant pipe is connected and that causes the refrigerant flow path to communicate with the first refrigerant pipe. The second plate includes a second connection portion to which a second refrigerant pipe is connected and that causes the refrigerant flow path to communicate with the second refrigerant pipe. One or both of the first plate and the second plate include a third connection portion to which a third refrigerant pipe is connected and that causes the refrigerant flow path to communicate with the third refrigerant pipe.

Abstract: The present disclosure provides, for example, a method that can produce a fluorolactone compound from hexafluoropropylene oxide or the like in a single step. The present disclosure relates to a method for producing a compound represented by formula (1): wherein two R1 are the same and each is a fluorine atom or a fluoroalkyl group, the method comprising step A of reacting a compound represented by formula (2): wherein R1 is as defined above, with a compound represented by formula (3): wherein R31, R32, and R33 are the same or different and each is a hydrogen atom or an alkyl group, or two of them are optionally linked to each other to form a ring optionally having one or more substituents, and a compound represented by formula (4-1) or the like: wherein R41, R42, R43, and R44 are the same or different and each is a hydrogen atom ox an alkyl group, or two of them are optionally linked to each other to form a ring optionally having one or more substituents.

Abstract: A fan unit reduces the number of man-hours for a preliminary test and eliminates the need for a trial run at the time of duct connection are realized. A second controller acquires: a rotation speed of a fan motor of a second fan; a volume of air, a wind speed, or front-rear differential pressure of the second fan; and an air volume target value or a wind speed target value for the second fan, and calculates a rotation speed target value Ny for the fan motor 31b by using a first function: Ny=(Qy/Qx)2×?Px×{m×(Qy/Qx)×Vx+p}+n×(Qy/Qx)×Vx+q. Furthermore, when the front-rear differential pressure fluctuates and the wind speed is decreased from Vt to V, the second controller calculates a rotation speed change amount to the rotation speed target value by using a second function: ?N=a×(Vt?V).

Abstract: A refrigeration cycle system includes a refrigeration cycle apparatus, an operation signal transmitter, a detection unit, a notification unit, and a processing unit. The refrigeration cycle apparatus includes a refrigerant circuit. The operation signal transmitter transmits an operation signal for the refrigeration cycle apparatus. The detection unit detects leakage of a refrigerant. The notification unit notifies of leakage of the refrigerant by emitting at least one of sound and light in a case in which the detection unit has detected leakage of the refrigerant. The processing unit causes the notification unit to execute test behavior of emitting at least one of sound and light in a case in which the operation signal transmitter transmits the operation signal to the refrigeration cycle apparatus.

Abstract: Provided is a composition for a refrigeration machine capable of reducing a friction coefficient in friction between sliding members in a refrigeration machine, and a composition kit for a refrigeration machine for providing the composition for a refrigeration machine. A composition for a refrigeration machine of the present disclosure includes a refrigeration machine oil, nanodiamond particles dispersed in the refrigeration machine oil, and a dispersant. The refrigeration machine oil preferably contains a polyvinyl ether, a polyol ester, a polyalkylene glycol, an alkylbenzene, or a mineral oil. The composition kit for a refrigeration machine of the present disclosure includes a refrigeration machine oil (A) containing a base oil and nanodiamond particles dispersed in the base oil, and a refrigerant (B).

Abstract: A connection pipe of a heat exchange unit includes a second refrigerant pipe made of a second metal higher in potential than a first metal of a first refrigerant pipe. The second refrigerant pipe includes a first section that is bent to protrude upward. The first section includes a first curved section disposed on a first refrigerant pipe side relative to an apex of the first section and a second curved section disposed on a side opposite to the first refrigerant pipe side relative to the apex of the first section. A covering member or a coating film is provided in intimate contact with the second refrigerant pipe to cover a first refrigerant pipe side edge of the second refrigerant pipe and the first curved section.

Abstract: An indoor unit includes a casing, a heat exchanger accommodated in the casing, and connection pipe, connected to the heat exchanger, through which a refrigerant flows. The connection pipe includes a first refrigerant pipe made of a first metal and a second refrigerant pipe made of a second metal higher in potential than the first metal. One end of the first refrigerant pipe is connected to the heat exchanger, and the other end of the first refrigerant pipe is connected to one end of the second refrigerant pipe in the casing.

Abstract: A cascade unit and a refrigeration cycle apparatus are capable of cooling an electric component. The cascade unit of the refrigeration cycle apparatus includes a primary-side refrigerant circuit that includes a primary-side heat exchanger and in which a primary-side refrigerant flows, a secondary-side refrigerant circuit that includes a secondary-side compressor and a utilization-side heat exchanger and in which a secondary-side refrigerant flows, and a cascade heat exchanger that causes the primary-side refrigerant and the secondary-side refrigerant to exchange heat with each other, the cascade unit including the secondary-side compressor, the cascade heat exchanger, a first electric component, a second electric component, a third electric component, and an electric component fan, and a cascade casing that accommodates the secondary-side compressor, the first electric component, and the electric component fan.

Abstract: An inside air control apparatus includes a composition adjuster. Outside air flowing in a first inflow path and inside air flowing in a second inflow path flow into the composition adjuster as the air to be treated. The composition adjuster separates the air to be treated into first air and second air. The first air flows into a first outflow path. The second air flows into a second outflow path. An outlet switching mechanism changes the destinations of the first air and the second air.

Abstract: A cascade unit and a refrigeration cycle apparatus are capable of cooling an electric component. A cascade unit of a refrigeration cycle apparatus includes a primary-side refrigerant circuit that includes a primary-side heat exchanger and through which a primary-side refrigerant flows, a secondary-side refrigerant circuit that includes a secondary-side compressor and a utilization-side heat exchanger and through which a secondary-side refrigerant flows, and a cascade heat exchanger that exchanges heat between the primary-side refrigerant and the secondary-side refrigerant, the cascade unit including the secondary-side compressor, the cascade heat exchanger, a first electric component that drives the secondary-side compressor, a first cooling portion that cools the first electric component with the secondary-side refrigerant flowing through the secondary-side refrigerant circuit, a cascade casing that accommodates the secondary-side compressor, the first electric component, and the first cooling portion.

Abstract: An object is to suppress disproportionation in a refrigerant comprising HFO-1132(E) when the refrigerant has a pressure of 3.0 MPa. A composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and tetrafluoropropene in a total amount of 99.5 mass % or more based on the entire refrigerant, wherein when the mass % of HFO-1132(E), HFO-1123, and tetrafluoropropene based on their sum is respectively represented by x, y, and z, coordinates (x, y, z) in a ternary composition diagram in which the sum of HFO-1132(E), HFO-1123, and tetrafluoropropene is 100 mass % are within the range of a figure surrounded by straight lines AB, BO, and OA that connect the following 3 points: point A (44.0, 0.0, 56.0), point B (0.0, 56.0, 44.0), and point O (0.0, 0.0, 100.0), or on the above straight line AB (excluding the points A and B).

Abstract: A heat exchanger that exchanges heat between a refrigerant and air, includes: flat tubes disposed in a first direction intersecting with a longitudinal direction of cross sections of the flat tubes and through which the refrigerant flows; first heat transfer fins that contact the flat tubes and are disposed on a windward side of the flat tubes; and second heat transfer fins that contact the flat tubes and are disposed on a leeward side of the flat tubes. The first heat transfer fins are inserted toward the flat tubes from a side of first ends in the longitudinal direction. The second heat transfer fins are inserted toward the flat tubes from a side of second ends in the longitudinal direction.

Abstract: An indoor heat exchanger includes a heat exchanger body and a connection pipe connected to the heat exchanger body through a connection portion. The connection pipe includes a first curved portion having an elongation greater than or equal to 30%.

Abstract: A method for producing a hydrocarbon including: preparing a molten salt containing a carbonate of a first metal; obtaining precipitates containing a first metal carbide by applying a voltage to the molten salt; and obtaining a gas containing the hydrocarbon and a hydroxide of the first metal by hydrolyzing the first metal carbide.

Abstract: An indoor unit includes a heat exchanger and a connection pipe, connected to the heat exchanger, through which a refrigerant flows. The connection pipe includes a first refrigerant pipe made of a first metal and a second refrigerant pipe made of a second metal higher in potential than the first metal. One end of the first refrigerant pipe is connected to the heat exchanger, and the other end of the first refrigerant pipe is connected to one end of the second refrigerant pipe. The first refrigerant pipe includes a vertical straight section, a bent section that is continuous with to a one end of the vertical straight section, and a horizontal straight section that is continuous with one end of the bent section. A covering member adheres to and covers the first refrigerant pipe from one end of the horizontal straight section to the bent section.