Abstract: An outdoor unit of a refrigeration apparatus includes a heat exchanger, a casing constituent member and a seal member. The heat exchanger has plural collection header pipes, plural fins disposed at a predetermined fin pitch between the header pipes, and plural heat transfer tubes inserted through the fins and connected to the header pipes. An interstice larger than the fin pitch is formed between one of the header pipes and one of the fins adjacent to the one of the header pipes. The casing constituent member is disposed facing the one of the header pipes and is configured to surround part of the heat exchanger. The seal member is attached to the casing constituent member, is pressed against the one of the header pipes and the one of the fins in the environ of the interstice facing the casing constituent members, becomes deformed, and closes the interstice.

Abstract: In a heat exchanger, a principal windward heat exchange region includes a principal windward bank portion, a principal leeward heat exchange region includes a principal leeward bank portion, an auxiliary windward heat exchange region includes an auxiliary windward bank portion, and an auxiliary leeward heat exchange region includes an auxiliary leeward bank portion. Each of the principal and auxiliary bank portions is constituted of a plurality of flat tubes. In the heat exchanger functioning as an evaporator, a refrigerant flows sequentially through the auxiliary windward, auxiliary leeward, principal leeward, and principal windward bank portions. In the heat exchanger functioning as a condenser, a refrigerant flows sequentially through the principal windward, principal leeward, auxiliary leeward, and auxiliary windward bank portions. Consequently, the heat exchanger exhibits performance sufficient for functioning as both an evaporator and a condenser.

Abstract: A heat exchanger includes a plurality of flat tubes arranged one above the other, a plurality of fins connected to the flat tubes, a first header collecting pipe in which one end of each of the plurality of flat tubes is inserted, and a second header collecting pipe in which the other end of each of the plurality of flat tubes is inserted. The heat exchanger exchanges heat between a fluid flowing through the flat tubes and air outside the flat tubes. Each of the first and second header collecting pipes extends in a vertical direction. At least one of the first and second header collecting pipes comprises a communication space that communicates with an upstream side of the plurality of flat tubes when the heat exchanger functions as an evaporator. The communication space comprises a partition plate.

Abstract: In two heat exchange regions connected together in series when an outdoor heat exchanger functions as an evaporator, a downstream one of the heat exchange regions has heat exchange sections not less than heat exchange sections of an upstream one of the heat exchange regions, and a most downstream one of the heat exchange regions has more heat exchange sections than a most upstream one of the heat exchange regions.

Abstract: A first header collecting pipe of an outdoor heat exchanger has three communication chambers and one mixing chamber. One auxiliary horizontal partition plate is disposed between two main horizontal partition plates. The mixing chamber is defined between the first main horizontal partition plate and the auxiliary horizontal partition plate. A gas-liquid two-phase refrigerant supplied to the outdoor heat exchanger functioning as an evaporator flows into the mixing chamber, and is then distributed to the three communication chambers. This structure allows the refrigerant that is to be distributed from the mixing chamber to the communication chambers to have a uniform wetness.

Abstract: A heat exchanger includes a plurality of principal heat exchange sections and auxiliary heat exchange sections. Each of the auxiliary heat exchange sections is in series connection to a corresponding one of the principal heat exchange sections. Of tube number ratios of the number of the flat tubes constituting each of the heat exchange sections to the number of the flat tubes constituting a corresponding one of the auxiliary heat exchange sections, the first principal heat exchange sections which is the lowermost one has the smallest tube number ratio. Consequently, discharge of liquid refrigerant from a lower portion of the first principal heat exchange section is accelerated during defrosting, thereby shortening the time required for defrosting.

Abstract: An air conditioning apparatus includes an aluminum heat exchanger, an aluminum gas pipe, an aluminum liquid pipe and a copper gas pipe. The aluminum heat exchanger performs heat exchange between air and a refrigerant, and is disposed upright. The aluminum gas pipe channels gas refrigerant, and extends from a side part of the aluminum heat exchanger. The aluminum liquid pipe channels liquid refrigerant, and extends from an area below the aluminum gas pipe in the side part of the aluminum heat exchanger. The copper gas pipe channels gas refrigerant. The aluminum gas pipe is connected in a connecting part to the copper gas pipe from above the copper gas pipe. The aluminum pipe is disposed in an area outside of directly under the connecting part of the aluminum gas pipe and the copper gas pipe.

Abstract: A fin for a heat exchanger of an air conditioning apparatus includes a base material, a hydrophilic layer, and a corrosion-resistant layer provided between the base material and the hydrophilic layer. A contact angle of a surface of the hydrophilic layer with water is no more than 50 degrees. A water content of the hydrophilic layer per dm2 of the surface of the hydrophilic layer being at least 60 mg/dm2 and no more than 300 mg/dm2.

Abstract: A heat exchanger includes a plurality of flattened pipes, a header collection pipe, and a plurality of fins joined to the flattened pipes. The flattened pipes are joined to the header collection pipe. A fluid flowing through an interior of the flattened pipes exchanges heat with air flowing outside the flattened pipes. The header collection pipe has a header collection pipe and a cover member. The header collection pipe body is disposed so that a longitudinal direction is vertically oriented. The cover member is disposed inside from an upper end of the header collection pipe body, and closes off an upper side of the header collection pipe body. The header collection pipe body has a pipe end section that extends upward past the cover member. A drainage part is formed in a part of the pipe end section.

Abstract: An outdoor unit of a refrigeration apparatus includes a heat exchanger, a casing constituent member and a seal member. The heat exchanger has plural collection header pipes, plural fins disposed at a predetermined fin pitch between the header pipes, and plural heat transfer tubes inserted through the fins and connected to the header pipes. An interstice larger than the fin pitch is formed between one of the header pipes and one of the fins adjacent to the one of the header pipes. The casing constituent member is disposed facing the one of the header pipes and is configured to surround part of the heat exchanger. The seal member is attached to the casing constituent member, is pressed against the one of the header pipes and the one of the fins in the environ of the interstice facing the casing constituent members, becomes deformed, and closes the interstice.

Abstract: An outdoor unit of a refrigeration apparatus includes a heat exchanger constructed of aluminum or aluminum alloy, a floor frame, and a cap. The heat exchanger has a plurality of flat pipes arranged in rows so as to face a side face, a header manifold connected to each of the flat pipes, and a plurality of fins joined to the flat so that an exchange of heat occurs between a fluid flowing inside the flat pipes and air flowing outside the fiat pipes. The heat exchanger is mounted on the floor frame. The cap covers a lower end part of the header manifold from below the header manifold. The cap has a first drainage structure arranged so that if there is a gap between the header manifold and the cap water that has entered the cap via the gap drains out.

Abstract: A lower space of a first header collecting pipe of a heat exchanger is, by partitions, divided into three communication chambers and a single mixing chamber. The mixing chamber communicates with the communication chamber through a through-hole of a lower horizontal partition, communicates with the communication chamber through a through-hole of a vertical partition, and communicates with the communication chamber through a through-hole of an upper horizontal partition. Gas-liquid refrigerant flows into the mixing chamber, and is mixed in the mixing chamber. Then, the refrigerant is distributed to the communication chambers. Thus, the wetness of refrigerant flowing into a flat tube is uniformized among the flat tubes, and performance of the heat exchanger can be fully achieved.

Abstract: A fin for a heat exchanger of an air conditioning apparatus includes a base material, a hydrophilic layer, and a corrosion-resistant layer provided between the base material and the hydrophilic layer. A contact angle of a surface of the hydrophilic layer with water is no more than 50 degrees. A water content of the hydrophilic layer per dm2 of the surface of the hydrophilic layer being at least 60 mg/dm2 and no more than 300 mg/dm2.

Abstract: A fin of a heat exchanger includes: a plurality of intermediate plates arranged one above another and dividing a space between adjacent ones of flat tubes into air passages; a plurality of tube insertion portions each provided between vertically adjacent ones of the intermediate plates, with an upwind side thereof being open such that a corresponding one of the flat tubes is inserted therein; a vertically extending downwind plate that is continuous with downwind ends of the plurality of intermediate plates arranged one above another; and a plurality of upwind plates extending further toward an upwind side than the flat tubes from upwind side ends of the intermediate plates. Each of the upwind plates is provided with at least one upwind side heat-transfer portion which projects toward the air passages.