Abstract: A heat exchanger, including plural flat tubes arranged in a right-and-left direction orthogonal to a front-and-back airflow direction of the heat exchanger, a corrugated fin sandwiched by adjacent of the flat tubes and thermally connected thereto at each of apexes of the corrugated fin, an inlet header connected to one end of each of the flat tubes, and an outlet header connected to the other end of each of the flat tubes, the flat tubes extending along an up-and-down direction of the heat exchanger. The corrugated fin includes a protruding portion protruding to a front side with respect to a front-side end portion of each of the flat tubes, the protruding portion including a first lug portion oriented obliquely to the front-and-back direction, a second lug portion being formed in the right-and-left direction at a part sandwiched by the adjacent of the flat tubes.

Abstract: In a heat exchanger, a first heat exchange unit is formed by curving a third heat exchange unit having a planar shape through L-shape bending, and a second heat exchange unit is formed by curving a fourth heat exchange unit having a planar shape through the L-shape bending, independently of the third heat exchange unit. The first heat exchange unit and the second heat exchange unit are arranged so as to be opposed to each other along a corner portion between adjacent two side surfaces of a casing.

Abstract: An indoor unit for an air-conditioning apparatus includes a main heat exchanger unit and a sub heat exchanger unit, the main heat exchanger unit includes a first main heat exchanger disposed at a front side of a case and a first heat-transfer pipe extending in a vertical direction, and a second main heat exchanger disposed at a back side of the case and a second heat-transfer pipe extending in the vertical direction. The sub heat exchanger unit includes a leeward-side first sub heat exchanger disposed at a leeward side of the first main heat exchanger and a heat-transfer pipe extending in a width direction, and a leeward-side second sub heat exchanger including a heat-transfer pipe extending in the width direction of the case. The leeward-side second sub heat exchanger has a lower end surface located above an air passage wall and is disposed at a leeward side of the second main heat exchanger.

Abstract: A heat exchanger includes at least one flat tube configured to allow a refrigerant mixture inclusive of HFO1123, R32, and HFO1234yf to flow therethrough as a heat medium. The flat tube includes a plurality of flow paths for the heat medium. Each of the plurality of flow paths has a round rectangular shape in cross section, the round rectangular shape being defined by a pair of longitudinal line segments opposed to each other, a pair of lateral line segments opposed to each other, and a set of four rounded corners, each of the rounded corners being a segment of a circumference of a circle. The pair of longitudinal line segments are intersects with the pair of lateral line segments at the rounded corners. The round rectangular shape is configured to satisfy 0.005?r/d?0.8 where r is a radius of the circle, and d is a distance between the pair of longitudinal line segments opposed to each other.

Abstract: An indoor unit for an air-conditioning apparatus includes a case, an air-sending fan, and a heat exchanger unit. The heat exchanger unit includes a plurality of heat-transfer pipes extending in a vertical direction and forming a plurality of refrigerant passages in a width direction of the case and an air flow direction, and a plurality of headers connected to both ends of the plurality of heat-transfer pipes to allow the refrigerant to flow between the plurality of heat-transfer pipes. The plurality of headers include a plurality of division headers dividing and connecting the plurality of heat-transfer pipes arranged in the air flow direction and connecting in parallel the plurality of heat-transfer pipes arranged in the width direction, and a return header connecting and turning back the plurality of divided refrigerant passages arranged in the air flow direction and connecting in parallel the plurality of heat-transfer pipes arranged in the width direction.

Abstract: A refrigeration cycle apparatus according to the present invention includes a refrigerant circuit formed by connecting, by pipes, a compressor configured to compress a refrigerant sucked into the compressor and discharge the refrigerant, a condenser configured to cause the refrigerant to reject heat and condense the refrigerant, an electronic expansion valve configured to reduce a pressure of the condensed refrigerant, and an evaporator configured to cause the refrigerant to remove heat and evaporate the refrigerant, in which the refrigerant is a refrigerant mixture including R32 and HFO-1123, and in the refrigerant mixture, R32 is greater than HFO-1123 in mass %.

Abstract: A distributor includes a main body. The main body includes a refrigerant inflow path, a plurality of refrigerant outflow paths, a distribution path communicating with the refrigerant inflow path and the plurality of refrigerant outflow paths, and a plurality of tapered paths each communicating between corresponding one of the plurality of refrigerant outflow paths and the distribution path. The tapered paths each have an inlet opening and an outlet opening, the inlet opening being larger than the outlet opening.

Abstract: Plate-shaped fins of a heat exchanger each include, at circumferential portions thereof defining a notch in which a heat transfer tube having a flattened shape is disposed, fin collars formed by being raised from the circumferential portions. Each of the fin collars includes, in a position that faces a long axis side surface of the heat transfer tube, at least one reflare section bent in a direction opposite to the side surface. At least one of the reflare sections defining fin pitches between the adjoining plate-shaped fins is formed so that a reflare tip portion, which is a tip portion of the reflare section, is drawn apart from a contact side surface of the plate-shaped fin with which the reflare section comes into contact.

Abstract: A heat exchanger, in which refrigerant causing disproportionation is used, includes a main heat exchange unit including a plurality of first heat transfer pipes arranged side by side, a sub-heat exchange unit including a plurality of second heat transfer pipes arranged side by side, and a relay unit including a plurality of relay passages connecting the plurality of first heat transfer pipes and the plurality of second heat transfer pipes. Each of the plurality of relay passages has one inlet connected to a corresponding one of the plurality of second heat transfer pipes, and a plurality of outlets each connected to a corresponding one of the plurality of first heat transfer pipes. Each of the plurality of relay passages distributes the refrigerant flowing from the one inlet, without merging streams of the refrigerant together, and causes the refrigerant to flow out of the plurality of outlets.

Abstract: A refrigeration cycle apparatus avoids refrigerant conditions causing a disproportionation reaction and exhibit high performance with safety even when a refrigerant causing the disproportionation reaction is used in a zeotropic refrigerant mixture. The refrigeration cycle apparatus uses, as a working refrigerant, the zeotropic refrigerant mixture of a first refrigerant and a second refrigerant having a higher boiling point than that of the first refrigerant under the same pressure, and includes at least a main passage sequentially connecting a compressor, a first heat exchanger, an expansion valve, a gas-liquid separator, and a second heat exchanger. The first refrigerant causes the disproportionation reaction.

Abstract: A refrigeration cycle apparatus includes refrigerant circuits each configured to circulate a refrigerant of the same composition. The refrigerant circuit is provided with a radiator configured to condense the refrigerant to transfer heat to external fluid, and the refrigerant circuit is provided with a radiator configured to transfer heat to the external fluid while allowing the refrigerant to be maintained in a supercritical state. The radiator is arranged upstream of the radiator in a direction of a flow of the external fluid. A capacity of a refrigerant flow channel of the radiator is smaller than a capacity of a refrigerant flow channel of the radiator.

Abstract: A heat exchanger including a first heat exchanger disposed on upstream side of a heat exchange fluid and a second heat exchanger disposed on downstream side of the heat exchange fluid, which are connected in series in a flow path of a heat medium, wherein the heat medium flows from the first heat exchanger to the second heat exchanger so as to be parallel to the flow of the heat exchange fluid when the heat exchanger serves as an evaporator, the heat medium flows from the second heat exchanger to the first heat exchanger so as to be opposed to the flow of the heat exchange fluid when the heat exchanger serves as a condenser, and a sum of flow path volume of first heat-transfer tubes of the first heat exchanger is smaller than a sum of flow path volume of second heat-transfer tubes of the second heat exchanger.

Abstract: A heat exchanger according to the present invention includes a heat exchanging unit, and a distributing and joining unit connected to the heat exchanging unit and including a distributing flow passage and a joining flow passage. The distributing and joining unit separately includes a first header including the distributing flow passage formed therein and excluding the joining flow passage, and a second header juxtaposed to the first header and including the joining flow passage formed therein and excluding the distributing flow passage. At least one of the first header and the second header is a stacking type header including a plurality of plate-like members including partial flow passages formed therein and stacked so that the partial flow passages are communicated with each other to form the distributing flow passage or the joining flow passage.

Abstract: A tube fitting includes a through portion. A flat tube is connected to the first end portion of the through portion, and another tube different in cross-sectional shape from the flat tube is connected to the second end portion of the through portion. The central axis of the first end portion and the central axis of the second end portion are deviated from each other.

Abstract: A blower and an air conditioner that can generate airflow simulating that in the natural world are provided. The blower and the air conditioner each include: a fan configured to generate blowing air; a pair of vertical airflow direction vanes separated from each other as a left side and a right side on a front side of the fan, the pair of vertical airflow direction vanes causing the blowing air generated by the fan to be let out upward or downward; and a control section configured to drive the pair of vertical airflow direction vanes separately while varying a rotation frequency of the fan. Such configuration of the blower and the air conditioner enables generation of airflow simulating that in the natural world.