Abstract: A heat exchanger and an air-conditioning apparatus including the heat exchanger include: heat transfer tubes allowing a fluid to flow therethrough, and each having both ends in a tube axial direction that are sealed, the heat transfer tubes being arranged in a first direction crossing the tube axial direction; a tube pitch defining part that defines the tube pitch of the heat transfer tubes in the first direction; and one or more headers penetrating the heat transfer tubes in the first direction to couple the heat transfer tubes together. Each of the heat transfer tubes has one or more header insertion holes into which the one or more headers are inserted, and which extend through the heat transfer tube in the first direction, and each of the one or more headers has communication holes each causing the header to communicate with the inside of an associated heat transfer tube.

Abstract: A refrigerant distribution device includes an inflow pipe into which refrigerant flows, a branching portion provided at a position facing the inflow pipe and at which the refrigerant flowing in from the inflow pipe is branched, outflow pipes from which the refrigerant branched at the branching portion flows out, and a projection projecting from the branching portion in a refrigerant inflow direction. In a case where a flow-passage cross-sectional area of the inflow pipe is defined as Ai, a sum total of flow-passage cross-sectional areas of the outflow pipes is defined as Ao, a maximum inside diameter of the outflow pipes is defined as Do, a flow-passage cross-sectional area of a projection space in the projection is defined as At, and a width of the projection space in a projecting direction is defined as Lt, 0.05<(Ai/Ao)?0.5, At>Ai, and Lt>Do are satisfied.

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 heat transfer tubes and a fin disposed between the heat transfer tubes. The fin includes a fin portion defining a flat surface and one or more heat transfer promoter groups including heat transfer promoters. The heat transfer promoters extend from one adjacent heat transfer tube to the other adjacent heat transfer tube and slope relative to the fin portion. The heat transfer promoters include a first heat transfer promoter disposed most upstream in the air flow direction. A first drain space is provided between the first heat transfer promoter and an air upstream part of the fin portion that is located closest to and upstream of the first heat transfer promoter in the air flow direction. A second drain space is provided between the heat transfer promoters that are adjacent. The first drain space has a larger area than the second drain space.

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: A heat exchanger includes a plurality of heat exchange modules. Each of the plurality of heat exchange modules includes a pair of headers, a plurality of flat heat-transfer tubes, and a plurality of corrugated fins. The plurality of corrugated fins each have a corrugated shape and are each placed between ones of the flat heat-transfer tubes that face each other. The corrugated shape has apices joined to the flat heat-transfer tubes. The plurality of corrugated fins each include fin modules between the a pieces. The fin modules are arranged in the up-down direction. One of the corrugated fins situated on a leeward side in the direction of flow of the air is higher in outside-tube heat transfer coefficient than is one of the corrugated fins situated on a windward side in the direction of flow of the air.

Abstract: A heat exchanger includes heat transfer tubes, each having through holes, and including coupling units being configured to directly couple the through holes of adjacent heat transfer tubes from among the heat transfer tubes, or header pipes being inserted into the plurality of through holes, and being configured to couple the through holes of adjacent heat transfer tubes from among the heat transfer tubes, the coupling units or the header pipes constitute a plurality of header units extending in a first direction, allowing refrigerant communication between inner spaces of the heat transfer tubes, and forming a refrigerant inlet/outlet of a heat transfer tube group constituted of the heat transfer tubes, and header units are provided at a position dividing the plurality of heat transfer tubes into upper and lower portions in a gravity direction.

Abstract: A heat exchanger includes a first heat exchanger, a second heat exchanger and an inter-row connecting pipe. The first heat exchanger and the second heat exchanger each include: 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 heat exchanger includes flat tubes arranged in a first direction and extending in a second direction crossing the first direction. The flat tubes each include a tube wall having a heat transfer passage in which a fluid flows in an internal space. The tube wall includes tube-side wall portions facing each other in the first direction, formed in the shape of a flat plate, and having through holes. Any adjacent ones of the flat tubes include a connection portion that connects the tube walls of the adjacent flat tubes and causes the heat transfer passages in the tube walls to communicate with each other. The connection portion includes one or more connecting projections formed at an associated one or ones of the tube-side wall portions of the adjacent flat tubes and projecting in the first direction from an associated one or ones of peripheral portions of the through holes.

Abstract: A heat exchanger includes a leeward heat exchange unit disposed downstream in an air flow direction, a windward heat exchange unit, and a common header. The leeward heat exchange unit includes a first header, the windward heat exchange unit includes a second header, and, when the leeward heat exchange unit and the windward heat exchange unit each function as a condenser, the leeward heat exchange unit and the windward heat exchange unit include a first region in which refrigerant flowing into the first header flows against the air flow direction and flows into the second header, a second region in which the refrigerant flows parallel to the air flow direction and flows into the first header, and a third region in which the refrigerant flows against the air flow direction and flows into the second header.

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 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: A heat exchanger includes a plurality of heat transfer pipes provided at spacings from each other in a first direction, a header having an insertion hole in which a front end of each of the plurality of heat transfer pipes is inserted from a second direction orthogonal to the first direction, and a fin attached to heat transfer pipes. The header includes a divider configured to divided the inside of the header into a first space in which the insertion hole is provided and a second space to which a refrigerant pipe is connected. The divider is provided with an opening surrounding the outer periphery of the front end of the heat transfer pipe as seen from the second direction. An air-conditioning apparatus includes the heat exchanger as a condenser or an evaporator.

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 leeward heat exchange unit disposed downstream in an air flow direction, a windward heat exchange unit, and a common header. The leeward heat exchange unit includes a first header, the windward heat exchange unit includes a second header, and, when the leeward heat exchange unit and the windward heat exchange unit each function as a condenser, the leeward heat exchange unit and the windward heat exchange unit include a first region in which refrigerant flowing into the first header flows against the air flow direction and flows into the second header, a second region in which the refrigerant flows parallel to the air flow direction and flows into the first header, and a third region in which the refrigerant flows against the air flow direction and flows into the second header.

Abstract: A heat exchanger includes heat transfer tubes and a fin disposed between the heat transfer tubes. The fin includes a fin portion defining a flat surface and one or more heat transfer promoter groups including heat transfer promoters. The heat transfer promoters extend from one adjacent heat transfer tube to the other adjacent heat transfer tube and slope relative to the fin portion. The heat transfer promoters include a first heat transfer promoter disposed most upstream in the air flow direction. A first drain space is provided between the first heat transfer promoter and an air upstream part of the fin portion that is located closest to and upstream of the first heat transfer promoter in the air flow direction. A second drain space is provided between the heat transfer promoters that are adjacent. The first drain space has a larger area than the second drain space.

Abstract: A heat exchanger includes a plurality of heat transfer tubes, an outer pipe having a plurality of connection parts to each of which a corresponding one of the plurality of heat transfer tubes is connected, an inner pipe having a plurality of first orifices, and a first partition having a first through-hole, the first partition separating an inside of the outer pipe into a main space and a first space. The main space is a space with which the plurality of first orifices and the plurality of connection parts communicate. The first space communicates with none of the plurality of first orifices and the plurality of connection parts and is a space with which an opening provided at one end of the inner pipe communicates, the one end being a first end.

Abstract: A heat exchanger includes: heat transfer tubes; a first header; a second header; and a gas separation pipe. The first header includes a partition wall that partitions an internal space of the first header into spaces including a main flow space and a gas separation space. The partition wall has first openings through which the main flow space and the gas separation space communicate with each other. The gas separation space is located above the main flow space. The gas separation space and the refrigerant pipe are connected by the gas separation pipe.

Abstract: A heat exchanger includes a plurality of heat exchange modules. Each of the plurality of heat exchange modules includes a pair of headers, a plurality of flat heat-transfer tubes, and a plurality of corrugated fins. The plurality of corrugated fins each have a corrugated shape and are each placed between ones of the flat heat-transfer tubes that face each other. The corrugated shape has apices joined to the flat heat-transfer tubes. The plurality of corrugated fins each include fin modules between the a pieces. The fin modules are arranged in the up-down direction. One of the corrugated fins situated on a leeward side in the direction of flow of the air is higher in outside-tube heat transfer coefficient than is one of the corrugated fins situated on a windward side in the direction of flow of the air.

Abstract: A heat exchanger includes: a plurality of flat heat transfer tubes each having an elongated cross-sectional shape, each including refrigerant flow passages therein, and arranged apart from and in parallel with each other; and corrugated fins each provided between associated adjacent ones of the flat heat transfer tubes. Each of the corrugated fins has fin portions each having a plate shape, and is bent into a wave shape such that the fin portions are arranged alongside of each other in an axial direction of the flat heat transfer tubes. The fin portions include louvers. The louvers are made as different types of louvers to have different configurations, such that the different types of louvers are provided at respective selected sets of fin portions, to thereby cause different amounts of frost to be formed on the fin portions.