Abstract: A heat exchange unit includes a first heat exchanger and a second heat exchanger. The first heat exchanger has a plurality of first flattened tubes communicating at different heights with an individual space including a flow channel through which refrigerant is spouted upward when installation is in a first attitude. The second heat exchanger has a plurality of second flattened tubes communicating at different heights with an individual space including a flow channel through which refrigerant is spouted upward when installation is in the first attitude. The first heat exchanger is disposed so that refrigerant is spouted upward in a flow channel of the individual space also in the case of installation in a second attitude, and the second heat exchanger is disposed so that refrigerant is spouted upward in a flow channel of the individual space also in the case of installation in the second attitude.

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. The number of the flat tubes constituting each of the heat exchange sections is compared to the number of the flat tubes constituting a corresponding one of the auxiliary heat exchange sections, creating a tube number ratio, wherein the first principal heat exchange section, which is lowermost, 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: 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: 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: A heat exchanger includes a plurality of flat tubes and a coupling header. The flat tubes are disposed in multiple tiers along a predetermined tube tier direction and in multiple rows so as to be adjacent to each other in a tube row direction intersecting the tube tier direction and the longitudinal direction of the flat tubes. The coupling header is formed by joining a first member to a plurality of second members in the tube tier direction. The first member has a plurality of through holes through which pass the first end portions of the flat tubes. The second members when joined to the first member forming a plurality of coupling passages where the first end portions of the flat tubes adjacent to each other in the tube row direction communicate with each other.

Abstract: A refrigerant diverter diverts inflowing refrigerant and to cause the refrigerant to flow out to a downstream side. The refrigerant diverter includes a vertically extending diverter case, and a vertically extending rod-shaped rod member disposed inside the diverter case. The diverter case has a plurality of diverting channels disposed along a circumferential direction, a diverting space arranged to guide the refrigerant to the diverting channels, and a plurality of expelling spaces that communicate with the diverting space through the diverting channels, the expelling spaces being disposed along a vertical direction. The diverting channels are configured from a plurality of holes extending in a longitudinal direction of the rod member and integrally formed in the rod member.

Abstract: A refrigerant evaporator includes a plurality of vertically disposed flat tubes, and a refrigerant distribution and supply section that causes inflowing refrigerant to flow out to the plurality of flat tubes on a downstream side. The refrigerant distribution and supply section includes a refrigerant supply section having plural supply spaces, a refrigerant introduction and distribution section having an introduction space to introduce the inflowing refrigerant from a lower end side surface, and a distribution space to distribute the refrigerant, and plural connecting passages that guide the refrigerant to the supply spaces. A first flat tube communicating with a lowermost-tier supply space positioned on the lowermost side is disposed at a height position included in a height range of the introduction space, and a lowermost-tier connecting passage that guides the refrigerant to the lowermost-tier supply space is disposed at a position higher than the introduction space.

Abstract: A first header collecting pipe is divided into an upper space corresponding to an upper heat exchange region and a lower space corresponding to a lower heat exchange region. The lower space is divided into a plurality of communication spaces corresponding respectively to auxiliary heat exchange parts of the lower heat exchange region. A second header collecting pipe is divided into a communication space corresponding to both of a first main heat exchange part and the third auxiliary heat exchange part, and into communication spaces corresponding respectively to other main heat exchange parts and the other auxiliary heat exchange parts. Each of pairs of communication space and communication space is connected to an associated one of communication pipes.

Abstract: A heat exchanger includes a plurality of refrigerant tubes. In a flow divider, a part of a plurality of capillary tubes is connected to an open end portion on a side of a front tube plate, and a remainder of the plurality of the capillary tubes is connected to an open end portion on a side of a rear tube plate. The plurality of refrigerant tubes include even number refrigerant tubes constituted by an even number of heat transfer tube portions and odd number refrigerant tubes constituted by an odd number of heat transfer tube portions.

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 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 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: 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 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: 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 is provided in which a large number of plate-shaped fins are attached to outer peripheries of heat transfer tubes through which refrigerant flows. Three rows of heat transfer tubes are arranged along an air flow direction. An inlet side heat transfer tube in a case of using as an evaporator or an outlet side heat transfer tube in a case of using as a condenser has the smallest diameter. In a case where the most windward side heat transfer tube has the smallest diameter, a tube diameter of the most windward side heat transfer tube is D1, a tube diameter of the middle heat transfer tube is D2, and a tube diameter of the most leeward side is D3, D1<D2=D3, 4 mm?D3?10 mm, and 0.6?D1/D3<1 are satisfied.

Abstract: A heat exchanger (30) includes vertically arranged flat tubes (33) and plate-like fins (36) arranged in the direction in which the flat tubes (33) extend. The flat tubes (33) are inserted into notches (45) of the fins (36). Parts of the fins (36) between vertically adjacent ones of the notches (45) are windward plate parts (70), and parts of the fins (36) at leeward sides of the notches (45) are leeward plate parts (75). Each of the windward plate parts (70) includes windward heat transfer promotion parts (71) constituted by protrusions (81-83) and louvers (50a, 50b). On the plate parts (75), leeward heat transfer promotion parts (76) constituted by leeward protrusions (84) are provided. The heat transfer promotion parts (76) are located at leeward sides of the notches (45), and overlap with the heat transfer promotion parts (71) when viewed from front edges (38) of the fins (36).

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.