A finned tube heat exchanger includes a plurality of tube arrays, each of which includes a plurality of heat transfer tubes that each extend parallel to one another and are disposed at a predetermined pitch in a first direction that intersects a flow direction of heat exchanging air, in a second direction that intersects the first direction, any closest two of the plurality of tube arrays having a predetermined distance therebetween. One closest two tube arrays includes first and second tube arrays that respectively include a plurality of first heat transfer tubes and a plurality of second heat transfer tubes. When seen from the flow direction, each first heat transfer tube is disposed closer to one of an adjacent two second heat transfer tubes that is closest to said each first heat transfer tube, than to the other one of the adjacent two second heat transfer tubes.

A heat exchanger (100) and an air-conditioning system. The heat exchanger (100) comprises: a group of first heat exchange tubes (T1) for forming a first loop (C1); a group of second heat exchange tubes (T2) for forming a second loop (C2); and a group of fins (3), at least a plurality of fins (3) in the group of fins (3) being in contact with both at least a plurality of first heat exchange tubes (1) in the group of first heat exchange tubes (T1), and at least a plurality of second heat exchange tubes (T2) in the group of second heat exchange tubes (T2). If one loop of an air-conditioning system having two loops is closed, heat exchange regions of the fins for the loop can be used in the other loop, thereby improving the heat exchange efficiency of a heat exchanger.

A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

A radiator assembly in which numerous fins of a cooling element extending between two coolant channels of the cooling element are divided into at least two different cooling zone, a ventilator of the radiator assembly at least partially covers a first cooling zone of the at least two different cooling zones with respect to a direction extending from the ventilator module toward the cooling element, and a gap width of a gap between two adjacent fins in the first cooling zone is greater than that in a second cooling zone of the at least two different cooling zones.

A heat exchanger exchanges heat between refrigerant flowing inside and air flowing outside. The heat exchanger includes: an upstream-side flat tube; downstream-side flat tubes on a downstream side of the upstream-side flat tube in a direction of air flow; and a space formation member that defines a distribution space in which the refrigerant coming out of the upstream-side flat tube is distributed to the downstream-side flat tubes.

Mg and Bi are contained in each of a first fillet in a first braze joining portion in which a tube and a fin join, a second fillet in a second braze joining portion in which the tube and a header plate join, and a third fillet in a third braze joining portion in which the header plate and a tank body join. A concentration of Mg of each of the first to third fillets is from 0.2% or more to 2.0% or less by mass. When the tube includes a brazing material layer, a concentration of Mg of the tube at its plate thickness center is from 0.1% or more to 1.0% or less by mass. When the fin includes a brazing material layer, a concentration of Mg of the fin at its plate thickness center is from 0.2% or more to 1.0% or less by mass.

Mg and Bi are contained in each of a first fillet in a first braze joining portion in which a tube and a fin join, a second fillet in a second braze joining portion in which the tube and a header plate join, and a third fillet in a third braze joining portion in which the header plate and a tank body join. A concentration of Mg of each of the first to third fillets is from 0.2% or more to 2.0% or less by mass. When the tube includes a brazing material layer, a concentration of Mg of the tube at its plate thickness center is from 0.1% or more to 1.0% or less by mass. When the fin includes a brazing material layer, a concentration of Mg of the fin at its plate thickness center is from 0.2% or more to 1.0% or less by mass.

A heat exchanger includes a plurality of fins extending along upper and lower directions, and a flat tube extending crosswise to the plurality of fins. Each of the plurality of fins has a first side edge portion and a second side edge portion, the first side edge portion and the second side edge portion extending along the upper and lower directions. The flat tube has end portions in the longitudinal axis direction of the flat tube, the end portions including a first end portion and a second end portion. The first end portion is positioned closer to the first side edge portion than the second end portion is to the first side edge portion. Each of the plurality of fins includes at least one water guide portion formed at at least one of a position between the first side edge portion and the first end portion, and a position between the second side edge portion and the second end portion, the water guide portion extending in the upper and lower directions, a lower edge portion positioned below the flat tube in the upper and lower directions, and a protruding edge portion positioned below the water guide portion and protruding downwardly relative to the lower edge portion.

A microtube heat exchanger is disclosed, including two end plates with an array of holes or openings and an array of microtubes disposed in the array of openings between the two end plates. The heat exchanger can be used in environmental control systems, including systems for aerospace applications.