Provided are a heat exchanger that makes it possible to supply air of an appropriate temperature to a plurality of blowing ports of an air-conditioning unit, an air-conditioning unit that comprises the heat exchanger, and an air conditioner. This air-conditioning unit 10 comprises a heat exchanger 20 that exchanges heat between air and a coolant, a blower 11, and an air outflow part 12. The heat exchanger 20 comprises a plurality of tubes 21 in which the coolant flows, an inlet header 23, an outlet header 24, and a fin 22. The inlet header 23 includes: a low-temperature-side coolant inflow part 231 into which coolant that has a relatively low temperature can flow; and a high-temperature-side coolant inflow part 232 into which coolant that has a relatively high temperature can flow. The low-temperature-side coolant inflow part 231 and the high-temperature-side coolant inflow part 232 are offset from each other in the direction D1 of the flow of air that passes through the heat exchanger and in an intersecting direction D2 that intersects the direction D1 of the flow of air.

A cooling device comprising a cooling circuit comprising a compressor, which is adapted to compress cooling agent in the cooling circuit during an active cooling mode, wherein the compressed cooling agent contains lubricant oil from the compressor; a condensing unit, which is connected to the compressor by a first fluid line of the cooling circuit; an evaporator, which comprises a top part, a bottom part, and a plurality of evaporating tubes connecting the top part with the bottom part, wherein the top part is connected to the condensing unit by a second fluid line of the cooling circuit, and wherein the bottom part is connected to the compressor by a third fluid line of the cooling circuit.

The disclosed technology can include a bypass valve assembly having a partition that can fluidly separate an inlet and an outlet of a fluid heating system. A first bypass valve and a second bypass valve can be mounted to the partition and configured to permit a fluid to flow between the inlet and the outlet. The first bypass valve and the second bypass valve can be configured to transition between a closed state and an open state. The first bypass valve and the second bypass valves can each have a spring configured to transition the respective first and second bypass valve from the closed state in response to experiencing a pressure that is greater than or equal to a respective first or second predetermined pressure. The second predetermined pressure can be greater than the first predetermined pressure.

A bent heat exchanger is provided. The bent heat exchanger includes: a first header and a second header; a plurality of flat tubes, two ends of the flat tube being connected to the first header and the second header respectively; and fins, each disposed between adjacent flat tubes, extending in a corrugated shape along a length direction of the flat tube. The first header and the second header each have a slot running through a wall thereof and a protrusion arranged to an inner surface of the wall thereof. The protrusion includes an arc portion connected to the edge of the slot, and an extension portion protruding inwards from the arc portion. An arc radius of the arc portion is less than or equal to and greater than 0.6 times a thickness of a wall of the corresponding first header or second header.

There are provided a heat exchanger having a flat tube and a fin bonded together, without causing melting of a coating material covering the fin, and a method of manufacturing thereof. A heat exchanger includes: a flat tube having a flat cross-sectional shape and covered with an anticorrosive layer; and a fin bonded to the flat tube with a bonding agent on a first surface of the anticorrosive layer interposed therebetween, and covered with a coating material, the first surface of the anticorrosive layer having been roughened, and the bonding agent being fixed to the roughened first surface.

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 large scale field erected air cooled industrial steam condenser. A bottom bonnet runs along the bottom length of the heat exchanger bundle for delivering steam to the bottom end of the condenser tubes and for receiving condensate formed in those same tubes. The tops of the tubes are connected to a top bonnet. Uncondensed steam and non-condensables flow into the top bonnet from the condenser tubes. Each cell of the ACC is fed by steam distribution manifold suspended from and directly below the bundle support framework.

A tube for use in a heat exchanger includes an upper portion, a base portion spaced from the upper portion, and a partitioning wall depending from the upper portion. The partitioning wall is bent away and spaced from the base portion in a first section of the tube to form a single flow channel within the tube along the first section. The partitioning wall contacts the base portion in a second section of the tube to form a partition separating a first flow channel from a second flow channel along the second section. The first section of the tube is configured for reception into an opening of a header tank of the heat exchanger.

A heat exchanger, a heat exchanger unit, and a refrigeration cycle apparatus in which frost melt water is inhibited from reaching an upper surface of a header include: heat transfer tubes arranged in parallel with each other; a fin connected to one of the heat transfer tubes; and a header connected to the heat transfer tubes and having a header end surface along a direction in which the heat transfer tubes are arranged in parallel. The fin has an edge facing the header and extends in a first direction perpendicular to the axes of the heat transfer tubes. An end portion of the fin projects in the first direction relative to the header end surface, and another end portion of the fin in the first direction is positioned closer in the first direction to the heat transfer tubes than the header end surface is.

A heat exchanger includes: a plurality of flat tubes each of which has a refrigerant flow passage through which refrigerant flows in an up-down direction, the plurality of flat tubes being arranged parallel to each other at intervals; a plurality of fins each of which is provided between adjacent flat tubes of the plurality of flat tubes; an upper header to which an upper end portion of each of the plurality of flat tubes is connected; and a lower header to which an a lower end portion of each of the plurality of flat tubes is connected. Lower end portions of the plurality of fins are not joined to the lower header, and a lower gap is formed between the lower end portions of the plurality of fins and the lower header.