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 including: a header; flat tubes connected to the header and disposed in line along a longitudinal direction of the header; a first partition that partitions an inner space of the header into a first space on a side where the flat tubes are connected and a second space on a side opposite to the first space; and a second partition that partitions the inner space of the header into a first side and a second side. The first side is one side of the header in the longitudinal direction and the second side is opposite to the first side. The first partition has a common opening. The common opening includes an insertion opening and a refrigerant opening. A refrigerant moves between the first space and the second space via the refrigerant opening. The second partition is inserted into the insertion opening.

This disclosure provides a heat exchanger that can more efficiently remove the frost attached to the heat exchanger. A configuration of a heat exchanger according to the present invention includes a heat transfer member (e.g., a fin) that performs heat exchange with air, wherein the heat transfer member (e.g., the fin) includes, in a vicinity of an upstream-side edge in an air traveling direction, a plurality of linear protruding portions that are formed in parallel to the edge.

Various embodiments of the present disclosure provide a heat sink for a plug-in card and a plug-in card including the heat sink. The heat sink comprises a first part secured to a surface of the plug-in card and a second part coupled to the first part and being movable relative to the first part in a first direction, wherein the first direction is perpendicular to the surface of the plug-in card. In this way, when the second part and the first part have a larger overlap in the first direction, the heat sink has a smaller first height and when the second part and the first part have a smaller overlap in the first direction, the heat sink has a greater second height.

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.

A fin and a heat exchanger having the fin, wherein the fin includes a sheet body. The sheet body includes a plurality of cooling sheet units arranged along a longitudinal direction of the sheet body. Each cooling sheet unit includes a windward zone, a main heat exchange zone and a leeward zone arranged along a transverse direction of the sheet body. The windward zones of adjacent cooling sheet units are connected to each other. A flat tube groove extends between the leeward zone and the main heat exchange zone of one of the adjacent cooling sheet units and the leeward zone and the main heat exchange zone of the other of the adjacent cooling sheet units. Each cooling sheet unit is provided with a plurality of protrusions spaced apart from each other.

A heat exchanger including: rows of heat exchanging units that are superposed with one another in an air flow direction of the heat exchanger; and flat multi-hole tubes that extend from a first end toward a second of the heat exchanging units in a first direction in the heat exchanging units and that include gas-side flat multi-hole tubes. A refrigerant flows in the heat exchanging unit in the first direction. A number of the gas-side flat multi-hole tubes that are included in a front-most row heat exchanging unit on an airflow upstream side of the heat exchanger is less than a number of the gas-side flat multi-hole tubes included in a rear-most row heat exchanging unit on an airflow downstream side of the heat exchanger.

A heat exchanger unit includes: a first heat exchanger including a first header, a second header, and a first flat pipe group that includes first flat multi-hole pipes connected to each of the first header and the second header; and a second heat exchanger: disposed in parallel with the first heat exchanger on an air downstream side, from the first heat exchanger, of air flow generated by a fan; and including a third header, a fourth header, and a second flat pipe group that includes second flat multi-hole pipes connected to each of the third header and the fourth header. The fourth header causes a refrigerant that flows in from the third header to flow out to the first header.

A plurality of refrigerant channels are grouped into two or more sets of refrigerant channels arranged in an air flow direction, and the two or more sets of refrigerant channels. When the heat exchanger functions as an evaporator, the refrigerants in a pair of the sets of refrigerant channels adjacent to each other in the air flow direction flow in parallel with each other in opposite directions.

A heat exchanger includes: heat transfer tubes aligned with one another; a header connected to end portions of the heat transfer tubes; and fins joined to the heat transfer tubes. When viewed in a longitudinal direction of the header and when the heat exchanger is used as an evaporator, the header is divided into: a circulation space including a first space in which refrigerant flows in a first direction along the longitudinal direction of the header and a second space in which the refrigerant flows in a second direction opposite to the first direction along the longitudinal direction; and an insertion space into which the heat transfer tubes are inserted. The header includes: a circulation division plate that divides the first space from the second space; and an insertion space forming plate that divides the circulation space from the insertion space.