Abstract: New designs, methods and processes are described that in which laminated devices and configured in a style named the “ortho” style. To form a device in the ortho style, plates or sheets are machined to have apertures and then stacked together such that the apertures connect and fluid can flow through the device in a direction that is substantially parallel to the direction of sheet thickness. Various laminated devices and processes using them are also described. For example, devices in which non-rectangular microchannels conform around reaction chambers or other bodies that need to be heated or cooled, are described. Features that separate or trip boundary layer and enhance heat transfer are also described.

Abstract: A heat exchanger, in particular a heating element for motor vehicles, is provided that includes a block that has flat tubes and corrugated fins and a collecting tank on the inlet side and on the outlet side, wherein the flat tubes comprise flat sides having embossed vortex generators, and a coolant can flow through the flat tubes. The flat tubes can have an inner diameter in the range of 0.9 to 1.2 mm, preferably of 1.0 mm, and the corrugated fins can have a height in the range of 6.3 to 8.0 mm, preferably of 8.3 mm.

Abstract: Provided is a heater core which has a simple structure using a pipe connector formed by coupling a first plate and a second plate, thereby facilely manufacturing it, and also which can have a smaller size, since an inlet pipe and an outlet pipe are disposed to be adjacent to each other.

Abstract: A heat exchange unit having a plurality of chamber units, said chamber units including an inlet orifice member, an outlet orifice member, and a plurality of walls defining a chamber interior, said chamber interior having lateral walls with plurality of protrusion members. The inlet receives a heat exchange medium flowing in a first flow direction in an initial line of low. Disposed within the chamber interior is a medium directing member, having an inclined surface, diverting the heat exchange medium from the initial flow direction so that it disperses within the chamber interior, in to at least two distinct flow patterns. The chamber interior having plurality of protrusion members on lateral walls of said interior, further causing the dispersion of heat exchange medium flow, causing turbulent flow pattern within the chamber interior. The heat exchange medium exits the chamber, via the outlet, in the initial line of flow. The chambers are interconnected by tubes to form assemblies.

Abstract: A heat exchanger assembly having an inlet header, an outlet header spaced from the inlet header, a plurality of refrigerant tubes hydraulically connecting the inlet header with the outlet header. A distributor tube having a plurality of orifices disposed in the inlet header, wherein the orifices are arranged along the distributor tube such that at least one orifice is oriented in the liquid phase of the refrigerant pressed against the internal surface of the distributor tube regardless of orientation of the evaporator. The orifices may be arranged in a random order about the distributor tube, positioned in groups of at least two at predetermined locations, or spiraled along the distributor tube.

Abstract: An evaporator includes plural refrigerant flow members and corrugate fins disposed in corresponding air-passing clearances between the adjacent refrigerant flow members. Each refrigerant flow member includes plural flat tubes arranged in the front-rear direction. Each corrugate fin extends across all the flat tubes. A vertically extending drain portion is formed between the flat tubes adjacent each other in the front-rear direction. At each connection portion of the corrugate fin, a louver group including plural louvers inclining downward toward the front is provided to correspond to a front portion of each flat tube. At least the front-end louver of the louver group provided to correspond to the front portion of each flat tube except for the flat tube at the front end is located in the drain portion.

Abstract: A tube is composed of a first plate and a second plate which are opposed and engaged with each other. In a first region on both end sides of the tube, the first plate is formed into a shape in which an edge portion of the first plate is laid along a bent portion of the second plate so that an outer wall face of the tube forms a continuous face. In a second region of the tube, the first plate is formed into a shape in which the edge portion of the first plate is laid between the edge portion of the second plate and the bent portion of the second plate.

Abstract: A regenerator core for use in a gas turbine regenerator has integral manifold openings formed in the tube plates used to make up the core and has special reinforcing elements which provide high pressure containment in critical portions of the plate-and-fin heat exchanger construction. The reinforcing elements include a series of hoops of U-shaped cross section which are used to bridge the juncture lines of the heat exchanger manifolds. An outer channel region of the hoops is provided with a reinforcing strip of gusset material. The hoops with their reinforcing strips provide structural reinforcement in the region between the manifolds and the conventional side bar reinforcing members in the central core section.

Abstract: A heat exchanger, such as a radiator, may transfer heat from a liquid and employ a first header tank, a second header tank, a plurality of tubes fluidly joining the first and second header tanks, and a baffle within one of the first or second header tanks. The baffle may be located in a header tank positioned substantially parallel or perpendicular to a surface upon which a vehicle employing the hear exchanger rests. The baffle may be a wall defining only one slot, a wall defining only one slot that is open through one side of the wall, a wall that defines a plurality of slots, or a wall that defines a plurality of holes. The heat exchanger may further employ fluidly isolated first and second tube and fin sections each defining a self-contained flow path for cooling different liquids. The baffle may slow coolant flow in a flow path.

Abstract: An evaporating heat exchanger (12) comprises a multitude of parallel channels (40) extending between vertical header pipes (30,32) and forming flow passages (44) from the inlet chamber (34) and to the outlet chamber (36). A venturi device (50) is positioned within the inlet chamber (34) to ensure even mass distribution of refrigerant to the flow passages (44).

Abstract: Arrangement for circulating liquid in a liquid cooler (11) intended particularly for power electronics appliances, inside which cooler at least two longitudinal main ducts (22, 23) are arranged and transverse ducts (21) arranged between them and connecting them, and in which cooler at least one of the longitudinal ducts is an input duct (22), into which liquid from coming from outside is led via an input joint (12) and one is an output duct (23), from where the liquid is led out via the output joint (13), inside which output duct a tubular additional part (41) having an open end at least on the side of the output joint is installed, and which additional part is arranged detached from the output duct such that a gap remains between the outer surface of the additional part and the inner surface of the output duct for enabling a liquid flow in the output duct outside the additional part, and in which arrangement a first aperture or first apertures (P, N, P2) are arranged in the part of the additional part on the

Abstract: A core (26) extends through a circular bend (28) greater than 180 degrees to define a first leg (30) between the bend (28) and an inlet manifold (22) and a second leg (32) between the bend (28) and an outlet manifold (24). The legs (30, 32) are disposed in converging relationship from the bend (28) towards the manifolds (22, 24) to define an acute angle (?) between the legs (30, 32). The manifolds (22, 24) are aligned in juxtaposed relationship along an alignment axis (Y) and the legs (30, 32) are disposed in angular relationship to a reference axis (X) to define first and second drainage angles (?1, ?2) between the corresponding legs (30, 32) and the reference axis (X). The second drainage angle (?2) is >10 degrees and the first drainage angle is (?1)>20 degrees and the acute angle (?) is >10 degrees for draining condensate along the legs (30, 32) toward the juxtaposed manifolds (22, 24) to establish a common drainage point of the condensate.

Abstract: Heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems and heat exchangers are provided which include manifold configurations designed to promote mixing of vapor phase and liquid phase refrigerant. The manifolds contain flow mixers such as a helical tape, sectioned volumes, and partitions containing apertures. The flow mixers direct the flow of refrigerant within the manifold to promote a more homogenous distribution of fluid within the multichannel tubes.

Abstract: A microchannel heat exchanger has a core having at least one heat exchange tube bank having a plurality of flow channels with a small hydraulic diameter less than 5 mm. A means is provided to reduce the amount of water retained on the external surfaces of the at least one heat exchange tube bank. These means may utilize the incorporation of a particular routing of refrigerant within the heat exchanger, the operation and control of a fan associated with the heat exchanger, or the provision of structure to at least partially block liquid from reaching the heat exchanger tube bank.

Abstract: A cooling system (10) for an extreme ultraviolet (EUV) grazing incidence collector (GIC) mirror assembly (240) having at least one shell (20) with a back surface (22) is disclosed. The cooling system has a plurality of spaced apart circularly configured cooling lines (30) arranged in parallel planes (PL) that are perpendicular to the shell central axis (AC) and that are in thermal contact with and that run around the back surface. Input and output secondary cooling-fluid manifolds (44, 46) are respectively fluidly connected to the plurality of cooling lines to flow a cooling fluid from the input secondary cooling-fluid manifold to the output cooling secondary fluid manifold over two semicircular paths for each cooling line. Separating the cooling fluid input and output locations reduces thermal gradients that can cause local surface deformations in the shell that can lead to degraded focusing performance.

Abstract: The present invention relates to a flat tube for heat exchangers, particularly for charge air coolers, having a turbulence insert that lies on the inside, as well as to a heat exchanger, particularly a charge air cooler, having such flat tubes, and to a method for production of such a flat tube.

Abstract: A method for the production of heat exchangers (10, 110, 210) of the so-called plate type, comprising the operative steps of: —juxtaposing a couple of substantially identical metal plates (12, 14), —fixing together said juxtaposed plates (12, 14) to one another by means of welding performed at respective perimetric sides (13a, 13b, 13c, 13d), —further fixing together said juxtaposed plates to each other by means of a plurality of welding tracts (22), arranged in at least two alignments, parallel and adjacent to a couple of opposite perimetric sides (13a, 13c) of the plates themselves (12, 14), and at a pre-established spaced relationship from said sides, —introducing a fluid under pressure between said juxtaposed metal plates (12, 14), to form a hollow, substantially box-shaped body (17), in which an internal chamber (16) and two substantially tubular passages (16a, 16b), formed between said couple of opposite perimetric sides (13a, 13c) and the respective adjacent alignments of the welding tracts (22), are d

Abstract: A micro-channel heat exchanger for use in a refrigerant vapor compression system and suitable for bending has two or more separate heat exchange panels joined by a brace. Bending occurs at the brace to eliminate or reduce bending loads and forces on the inlet headers, outlet headers, and heat exchange tubes of the head exchanger to prevent excessive damage to the heat exchanger components.

Abstract: The invention relates to a heat exchanger for motor vehicles, especially for utility vehicles. The heat exchanger can include a heat exchanger unit that includes tubes having tube ends and ribs disposed between the tubes, and collecting tanks disposed on both ends and produced by internal high pressure forming for introducing and discharging a medium. The collecting tanks can include bottoms with openings for receiving the tube ends, covers, and inlet and outlet tubes.

Abstract: An evaporator includes a refrigerant inlet header and a refrigerant outlet header arranged side by side in a front-rear direction, and a refrigerant circulating passage holding the headers in communication. The inlet and outlet headers are provided with caps forming refrigerant inlet and refrigerant outlet, the caps are joined to a pipe joint member having refrigerant inlet and outlet portions in communication with the refrigerant inlet and outlet, the caps or the pipe joint member is provided with a positioning lug which is projecting from its side edge toward the other one and which is fitted with a positioning recess formed in the other one, and the caps and the pipe joint member have flat surfaces to be contact with each other and are brazed such that the lug is engaged with the recess and that the flat surfaces are in contact with each other.

Abstract: An air-to-air aftercooler may include at least one tube body configured to direct a flow of charged air, wherein the at least one tube body includes a first material. The air-to-air aftercooler may also include a header assembly coupled to ends of the at least one tube body. The header assembly may include a second different material.

Abstract: A micro-channel heat exchanger includes an inlet manifold fluidly connected with an outlet manifold by a plurality of generally parallel tubes, further defining a plurality of generally parallel micro-channels therethrough. Refrigerant is introduced to the heat exchanger through a distributor tube disposed within the inlet manifold. The distributor tube includes a plurality of non-circular openings disposed along the length thereof which act as an outlet for refrigerant flow into the inlet manifold and eventually into and through the tubes and micro-channels. The openings are preferably slots arranged along the length of the distributor tube at an angle relative to the longitudinal direction of the distributor tube and oriented within the inlet manifold for a general direction of refrigerant flow at an angle relative to the general direction of refrigerant flow through the tubes. Alternative shapes for the openings are also considered.

Abstract: A heat exchanger includes a pair of tanks, each of the tanks having a pair of baffles sealingly engaged to a center wall, a pair of sidewalls, and a cover to form a fluid tight seal therebetween and provide a closure to the tank, wherein each of the sidewalls includes a portion of at least one of a pin and bracket for mounting the heat exchanger.

Abstract: A method for fabricating a heat exchanger assembly (20) includes pressing a pair of headers (30, 38) into refrigerant tubes (76). A notch (50) is cut axially into header ends (32, 40). An inner radial abutment (24) is formed in each of the refrigerant conduits (22, 56), which are then each inserted through an open end cap (26). An outer radial abutment (28) is formed in each of the refrigerant conduits (22, 56) so that the open end caps (26) are retained in position between the radial abutments (24, 28). The radial abutments (24, 28) can comprise a bead, a radially inwardly extending shoulder, an outwardly extending shoulder, or an expansion beneath the open end caps (26). A tool presses each subassembly into the corresponding headers (30, 38) until the tool reaches the corresponding notch bottom (52).

Abstract: A heat exchanger unit comprising of plurality of disk type heat exchanger units, disk type heat exchanger units having an inlet and an outlet as a tubular member. Within a disk type heat exchanger unit is a chamber to facilitate flow of heat exchange media, having a heat exchange medium directing member disposed within the chamber to direct flow of heat exchange media herein.

Abstract: A heat exchanger includes a heat transfer surface to transfer heat to or from a working fluid, a manifold region with a plurality of internal walls defining a plurality of inlet and outlet passages, and a heat transfer region disposed between the manifold region and the heat transfer surface. The internal walls are substantially normal to the heat transfer surface for directing working fluid in a normal direction, and include a plurality of alternating inflow and outflow portions in fluid communication with corresponding inlet passages and outlet passages. Adjacent inflow and outflow portions are in fluid communication with each other. A heat transfer structure is disposed in each of the plurality of inflow portions and extend between the internal walls of the inflow portion, the heat transfer structure being in thermal communication with the heat transfer surface to transfer heat between the working fluid and the heat transfer surface.

Abstract: An inlet header of a microchannel heat exchanger is provided with a first insert disposed within the inlet header and extending substantially the length thereof, and having a plurality of openings for the flow of refrigerant into the internal confines of the inlet header and then to the channels. A second insert, disposed within the first insert, extends substantially the length of the first insert and is of increasing cross sectional area toward its downstream end such that annular cavity is formed between the first and second insert. The annular cavity of decreasing cross sectional area provides for the maintenance of a substantially constant mass flux of the refrigerant along the length of the annulus so as to thereby maintain an annular flow regime of the liquid and thereby promote uniform flow distribution to the channels.

Abstract: A cooling manifold and a method for manufacturing the cooling manifold are provided. The cooling manifold includes a housing that defines an interior region having a serpentine flow path therein. The housing has a first plurality of grooves extending from a first surface of the housing into the housing. The grooves do not fluidly communicate with the interior region. The first plurality of grooves receive a portion of a thermally conductive member therein to conduct heat energy from the thermally conductive member to the housing. The cooling manifold further includes a top cap configured to seal a first end of the housing and a bottom cap configured to seal a second end of the housing.

Abstract: A heat exchanger transfers heat from solid state heat conducting material to a fluid in a closed loop system. A heat harnessing component includes a closed-loop solid state heat extraction system having a heat exchanging element positioned within a heat nest in a well designed to optimize the transfer of heat from heat conductive material to a closed loop fluid flow. A piping system conveys contents heated by the heat exchanging element to a surface of the well.

Abstract: One embodiment comprises an apparatus with an evaporative unit for a refrigerant having a flow direction opposing the airflow direction and an adjustable airflow rate to utilize to produce both cold/dehumidified exit air and warmed exit refrigerant for high efficiency and to maintain an airflow sufficient to avoid freeze-up of evaporative unit or freeze-up to an extent that blocks the airflow. This may produce low humidity even when the room thermostat is set warm (e.g. 85 F) and 5%-30% lower A/C bills. Other embodiments comprise systems and methods related to the adjustable airflow. A further embodiment comprises a controller to adjust the humidity in an air-conditioned space to produce air, which is both temperature and humidity controlled.

Abstract: A heat exchanger assembly includes a first single-piece manifold and a second single-piece manifold spaced from and parallel to the first single-piece manifold. Each of the first and second single-piece manifolds has a tubular wall defining a flow path. A plurality of flow tubes extend in parallel between the first and second single-piece manifolds and are in fluid communication with the flow paths. An insert having a distribution surface is slidably disposed in the flow path of the first single-piece manifold to establish a distribution chamber within the first single-piece manifold. A series of orifices defined in the distribution surface of the insert are in fluid communication with the flow path and the distribution chamber for uniformly distributing a heat exchange fluid between the flow path and the flow tubes.

Abstract: A heat exchanger having an active surface over which a fluid flows to affect an exchange of heat between the active surface and the fluid. In some embodiments, the active surface includes a logarithmic spiral wherein the radius of the logarithmic spiral measured at equiangular radii unfolds at a constant order of growth. Further embodiments exhibit an active surface conforming to the internal or external surface of particular classes or genera of shells.

Abstract: In a heat exchanger having a casing in which a joint of the casing and between a core and the casing are brazed and fixed without a gap, the section of a portion in contact with the casing body is formed at a right angle at both ends of an upper edge portion of a header plate, and an upper lid is fitted so that it is brought into contact with the upper edge of the header plate over the entire length.

Abstract: In a heat exchanger including a plurality of tubes 1 through which a first fluid passes, a housing 2 in which the tubes 1 are installed, and sealing members for sealing a second fluid that flows over surfaces of the tubes 1, the housing 2 includes an inlet 4 for introducing the second fluid therein and a first outlet 5 and second outlets 6 for discharging the second fluid, and the sealing members include a first sealing member 3a positioned on one of end sides of the tubes 1, a second sealing member 3b positioned on the other end side of the tubes 1, and a third sealing member 3c positioned between the first and second sealing members 3a and 3b. The third sealing member 3c is provided so that a gap 7 is provided between the first sealing member 3a and the third sealing member 3c while another gap 7 is provided between the second sealing member 3b and the third sealing member 3c, and that a flow path for the second fluid is formed therein. The second outlets 6 are provided so as to be connected to the gaps 7.

Abstract: A connector assembly for a heat exchanger has a fitting and a mount to which the fitting couples. The fitting has an elongate body having a proximal portion and a distal portion. At the proximal portion there is a crossbar, and at the distal portion there are an inlet and an outlet that protrude away from the body. Two wings extend from the body in a direction opposite to that of the inlet and outlet. There is formed on each of the wings a locking protrusion. The mount has a top portion where there is a groove dimensioned to accept the crossbar of the fitting. A longitudinal channel is formed orthogonal to the groove in the mount. Two sidewalls extend from the mount each for accepting a corresponding one of the wings, when the fitting is coupled to the mount.

Abstract: A cooling apparatus with high strength and good heat radiation characteristics. In the cooling apparatus, a heat exchanger is joined to an evaporator disposed on the lower side in a face to face manner; a containing unit of the heat exchanger includes a heat exchanger high temperature liquid outlet, and a two-phase fluid inlet in a joint portion with the evaporator; an outlet header of the heat exchanger includes an intermediate liquid outlet at a joint portion with the evaporator; and the evaporator includes a two-phase fluid outlet in the joint portion with the heat exchanger in opposition to the two-phase fluid inlet of the containing unit, and including an intermediate liquid inlet at the joint portion with the heat exchanger in opposition to the intermediate liquid outlet of the outlet header.

Abstract: A combination heat exchanger comprising of a heat exchange core having a plurality tubes, wherein the core having at least one core end; an end tank having two side walls and two end walls, two bulkheads the cavity defining a least a first chamber, a second chamber, and a third chamber, a perimeter edge defined by exterior edges of said side walls, exterior edges of said two end walls, and exterior edges of said two bulkheads; a header plate engaged between said end tank and said core end; and a gasket between said perimeter edge and contact surface of said header plate, wherein the compression ratio of the gasket is varied along the contact surfaces of the perimeter edge and contact surface of the end plate.

Abstract: A heat exchanger has header tanks each including a header forming plate, a tube connecting plate, and an intermediate plate interposed between the two plates, the plates being arranged in superposed layers and brazed to one another. Each of the plates is made from a metal plate by press work. The header forming plate has an outward bulging portion. The tube connecting plate has tube insertion holes. The intermediate plate has communication holes causing tube insertion holes to communicate with the interior of each outward bulging portion therethrough. Heat exchange tubes have opposite ends placed into the respective insertion holes and brazed to the respective tube connecting plates. The heat exchanger including such header tanks is reduced in the number of components, can be fabricated with a high work efficiency, and exhibits improved heat exchange performance.

Abstract: This present invention describes a novel type of internal exchanger intended to carry out Fischer-Tropsch synthesis. This exchanger has a modular design and comprises a central tube with partitions allowing at the same time the supply of coolant to the hairpins of the module and the recovery of the partially vaporized fluid from these same hairpins.

Abstract: The present invention describes a novel type of internal exchanger for a gas-liquid-solid fluidized bed reactor employing a strongly thermal reaction. Said exchanger is modular in concept and comprises a central tube with separations allowing both supply of cooling fluid to the pins of the module and collection of partially vaporized fluid from said same pins.

Abstract: An aluminum plate heat exchanger which may include a first core and a second core defining a piping space therebetween. The exchanger also may include at least one inlet manifold and at least one outlet manifold, each manifold in fluid communication with the first core and the second core. The exchanger may also include inlet piping in fluid communication with the inlet manifold; and, outlet piping in fluid communication with the outlet manifold. In certain embodiments, at least a portion of the inlet piping or at least a portion of the outlet piping is positioned in the piping space.

Abstract: Petroleous production is associated with effluents well known to foul lines, nozzles, and containers while consuming substantial energy to assist in both production and remediation. A heat exchanger and manifold system maximizes flows, minimizes changes in flow cross-section, and maximizes heat transfer area, while recycling both water and heat between processes. Dirty regions and clean regions result from scrubbing horizontal exhaust stacks and evaporation of production water in concert to remediate one another, while recycling a significant portion of the energy consumed by each. The heat exchanger relies on a manifold having many layered conduits, each connected to a single layer level of one or more cylindrical conduits in the exchanger. The cylinders of the exchanger themselves are arranged in multiple layers, each layer of a heat exchanger element being connected to a single layer of the manifold.

Abstract: A parallel flow heat exchanger includes a plurality of connector tubes which fluidly interconnect the individual flat heat exchange tubes to a refrigerant delivery member such that the refrigerant flows along the lengths of the connector tubes and then flows in a direction orthogonal thereto to enter the flat heat exchange tubes to thereby provide improved refrigerant distribution thereto. The refrigerant distribution member may be an inlet manifold or an entrance port or a refrigerant distributor. The connector tubes may be connected so as to conduct the flow in parallel or in series, and an orifice may be placed at the entrance end thereof to improve refrigerant distribution.

Abstract: The invention relates to a flow channel having a mixing insert and a plurality of tubes guided parallel to the longitudinal axis of the flow channel over the length of the mixing insert, each mixing insert including at least twenty-eight pairwise crossed multi-wall sheets, the ratio of the width of the multi-wall sheets to the inside diameter of the flow channel being no more than 0.25, the ratio of the length of the mixing insert to the inside diameter of the flow channel being no less than 0.4, and the angle of the multi-wall sheets to the longitudinal axis of the flow channel being 30 to 60 and the ratio of the intermediate spacing of neighboring planes to the inside diameter of the flow channel being no more than 0.3, and to the inside diameter of the tubes being less than 6.

Abstract: A manifold for use in a heat exchanger assembly and a method of forming the manifold is disclosed herein. The assembly includes an upper manifold defining an interior and having a upper top portion having an upper opening in the center of said upper top portion. A partition is inserted through the upper opening to define a plurality of chambers in the interior. The partition has a plurality of locking tabs and dimples that abut the upper top portion. The method starts with the step of forming the upper manifold defining an interior and having an upper top portion defining an upper opening in the center of the upper top portion. The method continues with the step of dividing the upper manifold to define a plurality of chambers in the interior of the upper manifold and is finalized by joining the partition and the upper manifold through a snap fit.

Abstract: A heat exchanger including an inlet tank with an internal manifold space and a plurality of modules including a core having a plurality of tubes. The modules are in fluid communication with the inlet tank and the tubes terminate inside the manifold space so that a cooling media can flow in a direct path from the manifold space into the tubes.

Abstract: A heat exchanger, including first and second collecting tanks with an inlet, an outlet, and an opening through a wall of the first tank. At least one row of tubes extends between the collecting tanks, and the tubes and tanks carry a first medium and a second medium flows through the spaces between the tubes. A first partition divides the first collecting tank and defines an opening therethrough, and a second partition divides the second collecting tank, with the first and second partitions defining separate loops for the first medium when the first partition opening is closed. A discharge device selectively either simultaneously opens both the first collecting tank opening and the first partition opening for emptying or simultaneously closes both the first collecting tank opening and the first partition opening for operation.

Abstract: To provide a heat exchange device having tubes both ends thereof are fitted into a connecting pipe thereby exchanging heat at a surface of the tube, and a method of manufacturing the same. In a heat exchange device 1, both ends of a plurality of tubes 2 for letting through a second heat medium 4 are fitted tightly into connecting tubes 5 while being contacted with a first heat medium 3 thereby exchanging heat between the first and the second heat media 3 and 4, and an inner diameter of the connecting pipe 5 is larger at the side in which the tubes 2 are fitted.

Abstract: An improved heat exchanger is disclosed. The heat exchanger is of the type including a pair of headers and a plurality of tubes extending between and fluidly connecting the headers. The improvement comprises a tubular structure for and defining in part each of said headers. The tubular structure is defined by a pair of body elements and has opposed longitudinal joints defined by overlapping portions of the body elements. One of the body elements overlaps the other of the body elements to define one of the joints and is overlapped by the other of the body elements to define the other of the joints.

Abstract: A multi-pass heat exchanger having a return manifold with a partition, a front wall, and a rear wall is provided. The partition separates the return manifold into a collection chamber and a distribution chamber. The front and rear walls define a fluid channel. The front wall has a plurality of perforations placing the fluid channel in separate fluid communication with the collection chamber and the distribution chamber.