Mitsubishi Electric Corporation

Mitsubishi Electric Corpotation

Tsubasa Tanda

Yohei Kato

Shin Nakamura

Akira Ishibashi

Satoshi Ueyama

Motoki Otsuka

Yudai Sakabe

Shinya Higashiiue

Junichi Ono

Ryota Akaiwa

Katsuyuki Yamamoto

Seiji Nakashima

Tomohiko Takahashi

Sangmu Lee

Hirokazu Minamisako

Satoru Yanachi

Shinichi Uchino

Masaharu Miwa

Takafumi Mito

Kohei Kasai

Aya Kawashima

Kenichi Kitani

Ryo Terashima

Hidenari Ogata

An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a flow passage switching device, an outdoor heat exchanger, an indoor heat exchanger, a refrigerant container, a first expansion device and a second expansion device connected by pipes, wherein the indoor heat exchanger and the outdoor heat exchanger have inner volumes satisfying a relationship of an inner volume of the indoor heat exchanger&#x3c;an inner volume of the outdoor heat exchanger, and a controller which, performs control so as to allow the flow passage switching device to switch the flow passage to the heating flow passage and allow an opening degree of the second expansion device to be larger than that of the first expansion device, starts the compressor, performs control so as to allow the opening degrees of the first expansion device and the second expansion device to be initial opening degrees for the cooling operation.

Air-conditioning apparatus

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 includes a drainage passage that protrudes downward; and one or more drainage holes each formed to protrude downward from the drainage passage. The drainage passage includes a drainage surface inclined downward toward the one drain hole having a width larger than a width of the heat exchanger. The separation member is formed of a metal electrically less noble than a member forming the heat exchanger, or a resin member. The separation member is 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.

Outdoor unit for air-conditioning apparatus, and air-conditioning apparatus including the same

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.

Refrigeration cycle apparatus

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.

Outdoor unit for an air-conditioning apparatus having L-shaped heat exchanger and placement plate for same

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.

Heat exchanger and refrigeration cycle apparatus

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.

Outdoor unit for an air-conditioning apparatus

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 &#x3b8;&#x3e;&#x3b8;i&#x3e;0, where, an angle formed by a line Land a line Lis taken as &#x3b8;, and an angle formed by a straight line Land the line Lis taken as &#x3b8;i, the line Lis a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line Lis a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line Lis a line connecting an intersection P of the line Land the line Land a portion of the outer peripheral end portion of the air inlet portion.

Heat source unit and refrigeration cycle apparatus

A heat exchanger includes a plate fin, a first flat tube intersecting with the plate fin, and a second flat tube opposed to a flat tube lower surface of the first flat tube, the second flat tube being spaced from the first flat tube and arranged so as to intersect with the plate fin. A flat tube windward lateral surface of the first and second flat tubes is located on an inner side of a peripheral edge of the plate fin, which includes an elevated portion formed between the first and second flat tubes and is located between a first imaginary plane, connecting the flat tube windward lateral surface of the first and second flat tubes, and a second imaginary plane, connecting a center of the flat tube lower surface of the first flat tube and a center of the flat tube upper surface of the second flat tube.

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.

Heat exchanger

Provided are rectangular plate-like finslayered at intervals; and flat tubeswhich are perpendicularly extended through the layered plate-like finsand are provided on multiple levels along a longitudinal direction of the plate-like finsThe plate-like finsare provided with at least one heat transfer promoting sectionthat is positioned in a region between adjacently-positioned flat tubesand in which ridge sectionsand valley sectionshaving ridgelines extending in the longitudinal direction of the plate-like finsare arranged to alternate. En the heat transfer promoting sectionat least one slitallowing communication between a front and a back of the plate-like finis formed on a downwind side of the ridge sections

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Tokyo, Japan

Tsubasa Tanda