Abstract: An air-conditioning apparatus includes a controller configured to control operations of an outdoor fan. The controller has a voltage acquisition unit configured to acquire drive voltages of the outdoor fan at set time intervals while the rotation speed of the outdoor fan is maintained at a reference rotation speed, a determination unit configured to determine whether or not an acquired drive voltage is equal to or greater than a lower limit threshold and less than an upper limit threshold, an extraction unit configured to calculate an evaluation value by extracting a drive voltage determined to be equal to or greater than the lower limit threshold and less than the upper limit threshold, and a defrosting determination unit configured to decide to defrost the outdoor heat exchanger if the calculated evaluation value is equal to or greater than an evaluation threshold.

Abstract: A refrigeration cycle apparatus includes a refrigerant circuit which allows refrigerant to circulate therethrough, and an outdoor heat exchanger which exchanges heat between the refrigerant and outdoor air. The outdoor heat exchanger has first to third heat exchange sections. The second heat exchange section is located below the first heat exchange section, and the third heat exchange section is located below the second heat exchange section. In a refrigerant passage connecting the second and third heat exchange sections, a first pressure reducing device reduces a pressure of the refrigerant flowing through the refrigerant passage. In an operation mode in which the first and second heat exchange sections each serve as an evaporator, the third heat exchange section is located upstream of the second heat exchange section in the flow of the refrigerant, and refrigerant having a temperature higher than that of the outdoor air flows through the third heat exchange section.

Abstract: An outdoor unit for an air-conditioning apparatus that includes a bottom plate made of metal, an L-shaped heat exchanger made of metal different than the metal of the bottom plate, a placement plate provided on the bottom plate and having a heat exchanger placement surface on which the heat exchanger is placed. The placement plate having an L-shape in plan view, and the placement plate is held in contact with the bottom plate only below each of a short-side end portion of the placement plate, a long-side end portion of the placement plate, and a corner portion of the placement plate.

Abstract: Provided is a heat exchanger that is capable of avoiding a bridge phenomenon caused by water droplets between a plurality of flat tubes and is easily manufactured. The heat exchanger includes a plurality of plate-like fins arranged in parallel at intervals, the plurality of flat tubes inserted into the plurality of plate-like fins, and at least one water-guiding member arranged between adjacent ones of the plurality of flat tubes projecting from at least one of both outermost ones of the plurality of plate-like fins and having both end portions held in contact with projecting flat surfaces of the adjacent ones of the plurality of flat tubes.

Abstract: An outdoor unit for an air-conditioning apparatus is configured to suppress damage on hairpin portions at an end portion of an outdoor heat exchanger due to freezing. The outdoor unit includes: an air passage defined inside a casing; an outdoor heat exchanger, which is installed in the air passage, and includes a plurality of heat exchange portions; an outdoor unit fan configured to introduce air into the outdoor heat exchanger; and an air passage blocking object installed in the air passage, and configured to block air flow. The outdoor heat exchanger includes: a heat transfer tube configured to allow refrigerant to pass therein; and a fin connected to the heat transfer tube. The heat transfer tube includes a hairpin portion, which is bent and folded back and to which no fin is connected. The air passage blocking object is configured to cover the hairpin portion.

Abstract: A plate heat exchanger includes a plate stack including a plurality of heat transfer plates stacked with each other. Each of the heat transfer plates includes a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant. The heat transfer plates define heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, arranged alternately with one another. Each of the heat medium passages and the refrigerant passages is defined between adjacent ones of the heat transfer plates.

Abstract: A bellmouth of a heat source unit includes: a straight tubular portion having a cylindrical shape; an air inlet portion which is radially expanded toward the upstream side, wherein, the air inlet portion has at least one angle-reduced portion that satisfies ?0>?i>0, where, an angle formed by a line L1 and a line L2 is taken as ?0, and an angle formed by a straight line L3 and the line L2 is taken as ?i, the line L1 is a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line L2 is a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line L3 is a line connecting an intersection P of the line L1 and the line L2 and a portion of the outer peripheral end portion of the air inlet portion.

Abstract: An outdoor unit for an air-conditioning apparatus includes a heat exchanger; a bottom plate; and a separation member configured to separate the bottom plate and the heat exchanger, the bottom plate including: a drainage passage that protrudes downward; and one or a plurality of drainage holes each formed to protrude downward from the drainage passage, the drainage passage including a drainage surface inclined downward toward the one drain hole having a width larger than a width of the heat exchanger, the separation member being formed of a metal electrically less noble than a member forming the heat exchanger, or a resin member, the separation member provided in the drainage passage and shaped to prevent closing of the drainage passage, in which a height to a surface on which the heat exchanger is placed is larger than a height to an upper surface of the drainage passage.

Abstract: In a heat source-side unit according to the present invention, a temperature sensor is installed on an inter-column connecting part included in a plurality of inter-column connecting parts and located higher than an intermediate position in a vertical direction of a heat exchanger.

Abstract: A distributor includes: a fluid inlet; a plurality of fluid outlets; a distribution flow passage which causes the fluid inlet to communicate with the fluid outlets, and distributes fluid which flows into the distribution flow passage through the fluid inlet, among the fluid outlets; and a plurality of heat-transfer-tube insertion portions each formed to face an associated one of the fluid outlets, the heat-transfer-tube insertion portions allowing heat transfer tubes to be inserted therein. The heat transfer tubes are inserted in the heat-transfer-tube insertion portions such that an end portion of each of the heat transfer tuber is connected to the associated fluid outlet.

Abstract: A refrigeration cycle apparatus includes at least a compressor, a condenser, an internal heat exchanger configured to exchange heat between parts of refrigerant each having a different pressure, a refrigerant reservoir configured to store the refrigerant, a first pressure reducing device, an evaporator. The compressor, the condenser, the internal heat exchanger, the refrigerant reservoir, the first pressure reducing device, and the evaporator are sequentially connected to each other. The refrigeration cycle apparatus also includes a first pipe connecting the condenser and the refrigerant reservoir, and a second pressure reducing device provided to the first pipe between the internal heat exchanger and the refrigerant reservoir.

Abstract: A technique capable of realizing more suitable image output and the like for an own apparatus is provided with respect to communication among apparatuses in a system including a video display apparatus. A video display apparatus provided with an apparatus-apparatus communication interface (for example, an HDMI) holds own apparatus information. In a case where a video output apparatus is connected to a video input unit of the video display apparatus via a first apparatus-apparatus communication interface and a video output unit of the video display apparatus is connected to an external video display apparatus via a second apparatus-apparatus communication interface, external apparatus information is obtained from the external video display apparatus via the second apparatus-apparatus communication interface, and apparatus information (EDID) is provided to the video output apparatus via the first apparatus-apparatus communication interface.

Abstract: A refrigeration cycle apparatus includes a discharge temperature sensor that detects a discharge temperature of refrigerant discharged from a compressor, and a controller that controls the opening degree of an expansion valve. The controller computes an amount of variation of the discharge temperature resulting from varying the opening degree of the expansion valve, computes a ratio of the amount of variation of the discharge temperature to an amount of variation of the opening degree of the expansion valve, and determines the opening degree to be set to the expansion valve on the basis of the opening degree of the expansion valve that causes a change of the ratio.

Abstract: An outdoor unit for an air-conditioning apparatus is configured to suppress damage on hairpin portions at an end portion of an outdoor heat exchanger due to freezing. The outdoor unit includes: an air passage defined inside a casing; an outdoor heat exchanger, which is installed in the air passage, and includes a plurality of heat exchange portions; an outdoor unit fan configured to introduce air into the outdoor heat exchanger; and an air passage blocking object installed in the air passage, and configured to block air flow. The outdoor heat exchanger includes: a heat transfer tube configured to allow refrigerant to pass therein; and a fin connected to the heat transfer tube. The heat transfer tube includes a hairpin portion, which is bent and folded back and to which no fin is connected. The air passage blocking object is configured to cover the hairpin portion.

Abstract: In a refrigeration cycle apparatus, a refrigerant heat exchanger is provided within a refrigerant container, and the refrigerant heat exchanger is configured to exchange heat between refrigerant flowing through a bypass circuit and refrigerant accumulated in the refrigerant container.

Abstract: A heat exchanger includes a fin having a plate shape and including a first region where a plurality of cutout portions are formed with intervals in a longitudinal direction that is a gravity direction, and a second region where the plurality of cutout portions are not formed in the longitudinal direction, and flat tubes attached to the plurality of cutout portions and intersecting the fin. Protruding portions protruding from a planar portion of the fin are formed on the fin, and the protruding portions each have a shape in which a first end is located in the first region and a second end is located in the second region and below the first end.

Abstract: An outdoor unit includes a heat exchanger, a blower fan, an electronic board on which a heat-generating element is mounted, a housing, and a heatsink. The housing includes a partition plate partitioning the inside of the housing into a heat exchanger chamber in which the heat exchanger and the blower fan are placed and a machine chamber in which the electronic board and a compressor are placed, and a portion of the partition plate has an opening. The heatsink includes a main plate placed to cover the opening from the heat-exchanger-room-side of the partition plate and heat-releasing fins projecting from the main plate to the blower fan side, and a portion of the main plate comes into contact with the heat-generating element via the opening. The greater the amounts of heat transferred from the heat-generating element the heat-releasing fins, the larger the heat-releasing fins.

Abstract: A plate heat exchanger includes a plate stack including a plurality of heat transfer plates stacked with each other. Each of the heat transfer plates includes a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant. The heat transfer plates define heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, arranged alternately with one another. Each of the heat medium passages and the refrigerant passages is defined between adjacent ones of the heat transfer plates.

Abstract: A refrigeration cycle apparatus includes a refrigerant circuit which allows refrigerant to circulate therethrough, and an outdoor heat exchanger which is provided to the refrigerant circuit and exchanges heat between the refrigerant and outdoor air. The outdoor heat exchanger has first to third heat exchange sections. The second heat exchange section is located below the first heat exchange section, and connected thereto. The the third heat exchange section is located below the second heat exchange section, and connected thereto. In a refrigerant passage connecting the second and third heat exchange sections, a first pressure reducing device is provided, and reduces a pressure of the refrigerant flowing through the refrigerant passage.

Abstract: A bellmouth of a heat source unit includes: a straight tubular portion having a cylindrical shape; an air inlet portion which is radially expanded toward the upstream side, the air inlet portion has at least one angle-reduced portion that satisfies ?0>?i>0, where, an angle formed by a line L1 and a line L2 is taken as ?0, and an angle formed by a straight line L3 and the line L2 is taken as ?i, the line L1 is a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line L2 is a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line L3 is a line connecting an intersection P of the line L1 and the line L2 and a portion of the outer peripheral end portion of the air inlet portion.