Abstract: A heat exchanger includes heat transfer tubes disposed in an up-down direction and a distributor distributes refrigerant to the heat transfer tubes. The distributor has a main body having a first flow passage through which refrigerant flows upward, and an insertion part disposed inside the main body. When an upper one and a lower one of two among the heat transfer tubes are a first heat transfer tube and a second heat transfer tube, respectively, the insertion part is installed between the first heat transfer tube and the second heat transfer tube. The main body has a second flow passage through which refrigerant flows upward. Refrigerant having passed through the first flow passage and the second flow passage flows through the first heat transfer tube, and refrigerant having passed through the first flow passage flows through the second heat transfer tube.

Abstract: A refrigerant distributor includes an outer pipe, an inner pipe, and a structural part. The refrigerant outflow hole is provided such that an angle ? between a lower end of the inner pipe on a vertical line passing through a center of the inner pipe and a position of presence of the refrigerant outflow hole as seen from the center of the inner pipe falls within a range of 10 degrees???80 degrees. The refrigerant outflow hole comprises a sole refrigerant outflow hole provided in a vertical cross-section of the inner pipe at a position where the refrigerant outflow hole is provided.

Abstract: A heat exchanger includes: a heat exchange body having flat tubes arranged and spaced from each other in a horizontal direction; an upper header provided at an upper end of the heat exchange body; a lower header provided at a lower end of the heat exchange body; and a partition plate provided in at least one of the upper and lower headers to partition the heat exchange body into a plurality of regions in a horizontal direction. The partition plate is provided such that in each of the regions, refrigerant flows in the opposite direction to the flow direction of the refrigerant in an adjacent one of the region. The partition plate is also provided such that regarding the regions, the more downward the region relative to the flow of the refrigerant when the heat exchanger operates as a condenser, the smaller the region's flow passage cross-sectional area.

Abstract: A heat exchanger includes: flat heat exchange tubes each having an elongated cross section and planar outer surfaces that face each other, and each including a fluid flow passage; and corrugated fins each formed in the shape of waves and provided between associated adjacent ones of the heat exchange tubes. The corrugated fins each having ridge portions that correspond to ridges of the waves and that are joined to the associated heat exchange tubes, the corrugated fin having fins that are located between the ridge portions and are arranged in a height direction. The fins include drain slits each of which allows drainage of water on an associated one of the fins, and end portions of the drain slits of adjacent ones of the fins in a horizontal direction are located at different positions in the drain slits, the adjacent fins being adjacent to each other in the height direction.

Abstract: A heat exchanger includes a first heat exchanger and a second heat exchanger and an inter-row connecting pipe. The first heat exchanger and the second heat exchanger each includes: a plurality of heat transfer tubes extending in a vertical direction and spaced apart from each other in a horizontal direction; a first header located at lower ends of the plurality of heat transfer tubes, having an outlet for refrigerant, and configured to distribute or combine the refrigerant; and a second header located at upper ends of the plurality of heat transfer tubes, having an inlet for the refrigerant, and configured to distribute or combine the refrigerant. The inter-row connecting pipe connects the outlet of the first header in the first heat exchanger and the inlet of the second header in the second heat exchanger.

Abstract: A distributor, a heat exchanger, and a heat pump apparatus each includes an outer wall portion having a cylindrical shape and extending in a transverse direction and a plurality of cylindrical portions extending in the transverse direction, the plurality of cylindrical portions being provided in the outer wall portion or in a hollow portion inside the outer wall portion and each having a flow passage having a circular cross-section inside the cylindrical portion. The plurality of cylindrical portions are provided parallel to each other. The outer wall portion has a plurality of connecting ports formed in an upper or lower part of the outer wall portion and spaced apart from each other in the transverse direction. Each of the plurality of cylindrical portions has a plurality of orifices provided in the cylindrical portion and spaced apart from each other in the transverse direction.

Abstract: A heat exchanger includes a plurality of flat heat-transfer tubes; and a corrugated fin provided between each adjacent two of the plurality of flat heat-transfer tubes. The corrugated fin is joined to the outer lateral walls of each adjacent two of the plurality of flat heat-transfer tubes at apexes of the wavy shape. The corrugated fin includes fins connecting the apexes and being side by side in an axial direction of the plurality of flat heat-transfer tubes. The fin has a plurality of heat-transfer promoters each having a transfer-promoting projection projecting from a surface of the fin; and an open part provided in the fin. The fin includes, between the plurality of heat-transfer promoters, frost-growing areas each having a through-hole continuous with the open part of a corresponding one of the plurality of heat-transfer promoters.

Abstract: An indoor unit of an air-conditioning apparatus includes a fan, a heat exchanger, and a drain receiver. The interior of the housing is partitioned into a first space and a second space in an axial direction of the rotating shaft of the fan. In the first space, a first opening is provided to allow air to flow out toward a region located outward of the fan in the first space in a radial direction of the fan. In the second space, no opening is provided and a region located outward of the fan in the second space is closed in the radial direction of the fan. In at least part of a space between the fan in the first space and the heat exchanger, a first water receiving device is provided at a higher position than the drain receiver.

Abstract: A refrigeration cycle apparatus includes a refrigerant circuit in which at least a compressor, a condenser, a first pressure reducer, and an evaporator are connected by pipes. The condenser includes a plurality of heat transfer tubes extending in an up-and-down direction, a first header having a tubular outer wall into which first ends of the plurality of heat transfer tubes are inserted, and a partition plate that is provided from a first end to a second end of the first header in a longitudinal direction, partitions an internal space of the first header into a high-pressure refrigerant passage where the first ends of the plurality of heat transfer tubes are disposed and a low-pressure refrigerant passage where the first ends of the plurality of heat transfer tubes are not disposed, and is configured to exchange heat between high-pressure refrigerant and low-pressure refrigerant in the first header.

Abstract: A heat exchanger includes a tubular refrigerant distributor having insertion holes spaced from each other in a first direction and into which ends of heat transfer tubes are inserted in a second direction. A first partition plate partitions the refrigerant distributor into a first space into which the ends of the heat transfer tubes are inserted and a second space, larger than the first space, into which the ends of the heat transfer tubes are not inserted; and an inflow pipe provided on a one side-surface side of the refrigerant distributor. The heat transfer tubes are located apart from the first partition plate in the first space. The first partition plate is provided with an orifice that is provided at a location corresponding to a space between adjacent ones of the heat transfer tubes, and that causes the first space and the second space to communicate with each other.

Abstract: A heat exchanger mounted in an outdoor unit of an air-conditioning apparatus includes at least one heat exchanger core and a hot-gas refrigerant inlet formed in lower part of the heat exchanger and in which refrigerant flows when the heat exchanger functions as a condenser. Each heat exchanger core includes flat tubes extending in an up-down direction and are placed along a direction of flow of air. When a total flow passage cross-sectional area of each heat exchanger core is A [m2]=a×N [m2], where a [m2] is a flow passage cross-sectional area of each flat tube and N is a number of the flat tubes, a height of each of the heat exchanger cores is H [m], a differential pressure of a refrigerant flow passage is ?PHEX, and a liquid head is ?PHEAD, ?PHEX/?PHEAD=(5.94635×10?4×A?1.75030)/(8.4303H+0.8779)>1 is satisfied.

Abstract: An air-conditioning apparatus includes a refrigerant circuit configured to cause refrigerant to circulate therein, and an outdoor unit and an indoor unit forming the refrigerant circuit. The outdoor unit includes a heat exchanger provided with one heat exchanger core or two or more heat exchanger cores arranged along a flow direction of air. Each heat exchanger core has a plurality of flat tubes extending in an up-down direction. The heat exchanger is configured to cause the refrigerant to flow as an upward flow in the flat tubes when functioning as a condenser. The refrigerant is a two-component refrigerant mixture in which two refrigerants selected from R32, HFO1123, and R1234yf are mixed, or a three-component refrigerant mixture in which the three refrigerants are mixed.

Abstract: A heat exchanger includes a first header that extends in a horizontal direction, a plurality of first heat-transfer tubes that extend in a vertical direction, that are provided to the first header, and that are spaced from each other in a horizontal direction, a second header provided parallel to the first header, a plurality of second heat-transfer tubes that extend in a vertical direction, that are provided to the second header, and that are spaced from each other in a horizontal direction, and a corrugated fin placed between the plurality of first heat-transfer tubes and between the plurality of second heat-transfer tubes. The corrugated fin has an inter-header region between the first header and the second header, and, in the inter-header region, a first drain slit is formed through which meltwater is drained.

Abstract: A heat exchanger includes a plurality of heat transfer tubes, a liquid header distributor, and a gas header distributor. The heat transfer tubes include U-shaped bent portions. The heat exchanger includes a heat exchanger core. A relationship between the liquid header distributor and the plurality of heat transfer tubes is established such that 9?? is satisfied, where Lh [m] is the length of the liquid header distributor, Lb [m] is the length of the shortest one of the heat transfer tubes, and ? is the ratio of the length Lb of the shortest heat transfer tube to the length Lh of the liquid header distributor and is expressed by ?=Lb/Lh.

Abstract: An outdoor unit according to the present disclosure includes: a compressor that sucks refrigerant, compresses the sucked refrigerant, and discharges the compressed refrigerant; a first refrigerant flow switching device that switches a flow passage for the refrigerant between a flow passage for a cooling operation and a flow passage for a heating operation; a heat-source-side heat exchanger that causes heat exchange to be performed between the refrigerant and external fluid; a heat-source-side backflow prevention device and a connection pipe that are included in a flow passage for the refrigerant in which an outlet from which the refrigerant flows to an outside region and an inlet into which the refrigerant flows from the outside region are unchanged regardless of which of the cooling operation and the heating operation is performed; and a flow passage pipe through which part of the refrigerant having flowed from the inlet passes in the cooling operation.

Abstract: A heat exchanger includes a plurality of flat heat-transfer tubes and a corrugated fin placed between the plurality of flat heat-transfer tubes. Louvers in fin sections of the corrugated fin are divided into a first louver group formed further upstream in a direction of flow of air than a drain slit in the corrugated fin and a second louver group formed further downstream in the direction of flow of air than the drain slit. Plate portions of the first louver group and plate portions of the second louver group are inclined to a flat-plate portion in the fin sections and inclined in respective directions that are opposite to each other. The drain slit includes a plurality of drain slits formed between the first louver group and the second louver group at an interval in the direction of flow of air.

Abstract: A heat exchanger includes a distributor; a plurality of heat-transfer tubes; and a refrigerant inflow pipe. The plurality of heat-transfer tubes connected to the distributor stick out into an internal space of the distributor such that when the plurality of heat-transfer tubes and a part defined as the internal space are projected on a plane perpendicular to an axial direction of the distributor, the plurality of heat-transfer tubes occupies one-half or greater of the part defined as the internal space. The distributor includes an orifice plate and dividing the internal space. The orifice plate is located above the lowest one of the plurality of heat-transfer tubes in the internal space. The orifice plate has an orifice through which the upper and lower spaces communicate with each other.

Abstract: A corrugated fin of a heat exchanger is formed such that fin sections are joined together one after another in a tube axial direction of a plurality of flat heat-transfer tubes. Louvers in the fin sections of the corrugated fin are divided into a first louver group formed further upstream in a direction of flow of air than a drain slit in the corrugated fin and a second louver group formed further downstream in the direction of flow of air than the drain slit. Plate portions of the first louver group and plate portions of the second louver group are inclined to a flat-plate portion in the fin sections and inclined in respective directions that are opposite to each other. The drain slit includes a plurality of drain slits provided in a plurality of respective rows between the first louver group and the second louver group.

Abstract: An air-conditioning apparatus includes a compressor and an outdoor heat exchanger that operates as an evaporator. A first heat exchange unit of the outdoor heat exchanger includes: first heat transfer tubes extending in an upward/downward direction, and arranged apart from each other in a lateral direction; a first junction pipe extending in the lateral direction, and connected to the lower ends of the first heat transfer tubes; an outflow pipe connected to the first junction pipe at or below a center position of the first junction pipe in the upward/downward direction; second heat transfer tubes extending in the upward/downward direction, and arranged apart from each other in the lateral direction; a first distribution pipe extending in the lateral direction, and connected to the lower ends of the second heat transfer tubes, and a first connection part connecting upper ends of the first heat transfer tubes and upper ends of the second heat transfer tubes.

Abstract: A heat exchanger includes: flat heat exchange tubes each having an elongated cross section and planar outer surfaces that face each other, and each including a fluid flow passage; and corrugated fins each formed in the shape of waves and provided between associated adjacent ones of the heat exchange tubes. The corrugated fins each having ridge portions that correspond to ridges of the waves and that are joined to the associated heat exchange tubes, the corrugated fin having fins that are located between the ridge portions and are arranged in a height direction. The fins include drain slits each of which allows drainage of water on an associated one of the fins, and end portions of the drain slits of adjacent ones of the fins in a horizontal direction are located at different positions in the drain slits, the adjacent fins being adjacent to each other in the height direction.