A heat exchanger includes: a header that extends in a first direction; and a plurality of heat transfer tubes that extend in a second direction crossing the first direction, each of which has one end connected to the header, and that are arranged in the first direction at intervals. The header includes: a header body having a tubular shape, a first member through which the one end of each of the heat transfer tubes extends, and a second member positioned between the header body and the first member in the second direction. The second member includes: a base portion that extends in the first direction, and a plurality of protruding portions that extend from the base portion toward the first member in the second direction.

A flat tube, a multi-channel heat exchanger, and an air conditioning and refrigeration system. The flat tube has n groups of flow channels extending in a length direction of the flat tube, and the n groups of flow channels are distributed to be spaced apart in a width direction of the flat tube; and a flow cross-sectional area of a first group of the flow channels is A1, . . . , a flow cross-sectional area of k.sup.th group of the flow channels is A.sub.k, . . . , a flow cross-sectional area of an n.sup.th group of the flow channels is An, 1<k≤n, A.sub.k≥1.2A.sub.k−1, and k is an integer greater than 1.

A heat exchanger and method for producing such a heat exchanger which during operation in a flow direction is flown through by a medium to be cooled and by two different cooling media. A power plant has a generator cooled by means of a generator cooling gas and a heat exchanger cooling the generator cooling gas.

A fin of a heat exchanger includes: a substrate including aluminum or an aluminum alloy, the substrate including a plurality of holes or a plurality of cutout portions in which a plurality of heat transfer tubes are to be disposed respectively; and an organic layer disposed on an end face of the substrate.

A heat exchanger having a heat exchanger core having at least two rows of tube and fin blocks, each tube and fin block contains an assembly of tubes and fins, wherein the tubes are aligned parallel to each other while the fins are located between adjacent tubes, each tube having a first tube end and a second tube end, each tube and fin block of the first tube and fin block and the second tube and fin block having a manifold tube, the manifold tubes having a row of openings for a fluid tight connection with tubes of a tube and fin block, wherein the first tube ends of the first tube and fin block are fluid tight connected to the openings of a first manifold and the first tube ends of the second tube and fin block are fluid tight connected to the openings of a second manifold.

In one aspect, a hybrid heat exchanger that includes a metallic serpentine tube having an inlet end portion to receive a process fluid, an outlet end portion, and a series of runs and return bends directing the process fluid from the inlet end portion to the outlet end portion of the metallic serpentine tube. The hybrid heat exchanger further includes a thermally conductive polymer body thermally integrated with the serpentine tube. The thermally conductive polymer body has an outer surface to be contacted by a fluid, such as air and/or water. The thermally conductive polymer body is configured to transfer heat between the metallic serpentine tube and the fluid contacting the outer surface of the thermally conductive polymer body. The outer surface of the thermally conductive polymer body includes surface enhancement features that affect flow of the fluid across the outer surface of the thermally conductive polymer body.

Disclosed is a heat exchanger to reduce height and manufacturing cost. A heat exchanger includes a first heat exchanger provided in the form of a plate; and a second heat exchanger provided in the form of a plate and arranged to be inclined to the first heat exchanger, wherein a corner of at least one of an end of the first heat exchanger and an end of the second heat exchanger is positioned to face a plane of the other of the end of the first heat exchanger and the end of the second heat exchanger.

A heat exchanger includes: flat pipes arranged such that flat surfaces of the flat pipes are opposed to one another; and fins each including insertion parts that extend in an insertion direction that crosses a direction in which the flat pipes are disposed and a longitudinal direction of the flat pipes. At least part of each of the flat pipes is inserted into a corresponding one of the insertion parts. Each of the fins includes a cut-and-raised part that is cut and raised in a thickness direction between the insertion parts, and a rib disposed between the insertion part and the cut-and-raised part.

In a refrigeration system, a tube-and-fin heat exchanger has spaced fins that extend to an outer periphery of the heat exchanger and has smaller embedded fins in between or in a spaced relationship with each of the other fins. The embedded fins do not extend all the way to the outer periphery of the fins along the airside directions but have a shorter outer periphery such that there is an offset distance. Because of the offset distance, there is space that continues to provide room for fluid movement without fouling of the face of the heat exchanger and that provides an expected appearance while still having the benefit of additional fins elements further inside of the heat exchanger. Other exchangers and condensers are included.

A heat exchanger is connected to a first pipe through which a refrigerant flows. The heat exchanger includes: heat transfer tubes; and a header connected to the heat transfer tubes. The header includes: a first plate-shaped portion connected to the first pipe; a second plate-shaped portion connected to the heat transfer tubes; a third plate-shaped portion disposed between the first plate-shaped portion and the second plate-shaped portion; and a fourth plate-shaped portion that is disposed between the third plate-shaped portion and the second plate-shaped portion and that has communication openings for the heat transfer tubes. The first plate-shaped portion, the third plate-shaped portion, the fourth plate-shaped portion, and the second plate-shaped portion are stacked and overlap in a stacking direction. The third plate-shaped portion has a refrigerant flow path formation opening including: a first region through which the refrigerant flows in a first direction perpendicular to the stacking direction.