Abstract: A heat exchanger, preferably an oil cooler (1) for a motor vehicle, comprises stacked flat tubes (2, 3, 4), which have tube ends with apertures for admitting and discharging oil, which flows through the flat tubes (2, 3, 4) in their longitudinal direction. The apertures of adjacent flat tubes (2, 3, 4) are in fluid communication with one another in order to form flow passages, and spacings are left between the flat tubes for a medium, in particular a cooling medium, to pass through. The flat tubes are designed as extruded multi-channel tubes.

Abstract: A laminate-type evaporator includes U-channel plates in combination with various configurations of dual cup and single cup plates, to control refrigerant pressure drop and achieve enhanced temperature spreads within the evaporator. The U-channel plates define one or more of the final refrigerant passes in the evaporator, and the dual cup and single cup plates define refrigerant passes upstream therefrom. Fins are disposed between adjacent plate pairs and extend to selected end edges of the U-channel plates to maximize the surface area available for heat exchange in the final refrigerant passes.

Abstract: A stacking-type, multi-flow, heat exchanger includes a plurality of heat transfer tubes and fins stacked alternately, and a pair of tanks provided at either end of the heat transfer tubes. One of the tanks has an inlet tank portion and an outlet tank portion for the introduction and the discharge of a heat exchange medium to the heat exchanger. The heat exchanger has a flange member connected to the one of the tanks, the flange member has a flange body, an inlet pipe communicating with the inlet tank portion and an outlet pipe communicating with the outlet tank portion, and at least one of the inlet and outlet pipes is formed separately from the flange body. A passage for introducing heat exchange medium from the inlet pipe to the inlet tank portion and a passage for discharging heat exchange medium from the outlet tank portion to the outlet pipe are arranged in a thickness direction of the heat exchanger in parallel to each other.

Abstract: In a parallel flow heat exchanger, which is susceptible to having a non-uniform distribution of a two-phase refrigerant flow to the individual channels, the resultant differences in the refrigerant flow therethrough are compensated and counter-balanced by a corresponding difference in the external heat transfer rate for the respective channels. In one embodiment, these differences are accomplished by variable characteristics of extended heat transfer surface elements such as fin type, fin density, fin geometry and difference in construction materials, and in another embodiment, by varying the airflow distribution over the cross-section area of the heat exchanger.

Abstract: A heat exchanger including upper and lower header tanks, a vertical baffle in the lower header tank defining first and second longitudinal chambers, a check valve, two tube rows, and a coolant inlet to the first chamber and outlet from the second chamber. The baffle includes a by-pass hole therethrough. One tube row includes a plurality of vertical tubes extending between the upper header tank and the first chamber of the lower header tank, and the other tube row includes a plurality of vertical tubes extending between the upper header tank and the second chamber of the lower header tank. The check valve creates a leak-proof seal during standard operating mode to prevent pressure release from the header tank and creates an air path between the header tank and the environment during draining mode to allow vacuum relief from the header tank.

Abstract: The invention relates to a heat exchanger for vehicles. The heat exchanger includes a core provided with a row of spaced heat exchanger tubes, open at their ends, and at least one dosed container arranged in the tube end regions for the distribution of a medium flowing through the heat exchanger tubes. Each container includes a tube holding element and a container closure element, connected to each other in a sealed manner. The heat exchanger tubes are put through the tube holding element, connected to it and form spaces between each other. The container closure element is rigidly connected to at least one associated container comb, the teeth of which extend toward the heat exchanger core and are located within the container-interior at the spaces between the heat exchanger tubes and are in rigid connection to at least the tube holding element.

Abstract: A combination cooler includes a first circuit having a first series of tubes defining a first hydraulic diameter. The first fluid circuit is adapted to communicate a first fluid from a first inlet to a first outlet. A second fluid circuit includes a second series of tubes defining a second hydraulic diameter and a third series of tubes defining a third hydraulic diameter. The second fluid circuit is adapted to communicate a second fluid from a second inlet to a second outlet. The first and second hydraulic diameters are equivalent. The third hydraulic diameter is distinct from the first and second hydraulic diameter.

Abstract: In a method for manufacturing a stacking-type, multi-flow, heat exchanger, heat transfer tubes and outer fins are stacked alternately, each heat transfer tube being formed by connecting a pair of tube plates and including an inner fin therebetween. The manufacturing method includes the steps of disposing the tube plates so as to oppose each other, inserting an inner-fin forming material between the tube plates, stacking the tube plates with respect to each other so as to nip or seize the inner-fin forming material between the tube plates, and cutting the inner-fin forming material and end portions of the tube plates simultaneously. By this method, the time for required manufacturing heat transfer tubes may be reduced significantly, and the productivity of the heat exchanger may be increased significantly. The positioning of inner fins may be achieved with a high degree of accuracy.

Abstract: Disclosed is a heat exchanger, in particular for use in a motor vehicle, in addition to a circuit including a heat exchanger.

Abstract: A heat exchanger includes a container having an outlet and an entrance coupled to an inlet and an exit, a receptacle having an entering port and a discharging port for circulating a fluid medium and having an entering opening and a discharging opening. A casing is disposed between the container and the receptacle and includes a passage coupled between the outlet of the container and the entering opening of the receptacle, to allow a heat medium to flow from the container into the receptacle, and a chamber communicating with the discharging opening of the receptacle and the entrance of the container. An air filtering device may be disposed in the casing for air filtering purposes, and for collecting and discharging water.

Abstract: Disclosed is a heat transfer unit including at least two heat transfer elements, especially for a motor vehicle. The unit includes a plurality of tubes and corrugated ribs, two side parts which enclose the monoblock on the opposite sides thereof, whereby at least one side part comprises at least one expansion section.

Abstract: The invention relates to a method for producing a plate heat exchanger from a plurality of heat exchanger blocks (1a, 1b). Each heat exchanger block (1a, 1b) has mounted on it a header (6a, 7a, 6b, 7b) which extends over at least part of one side of the heat exchanger block (1a, 1b). The heat exchanger blocks (1a, 1b) are arranged next to one another, and the headers (6a, 6b; 7a, 7b) of two adjacent heat exchanger blocks (1a, 1b) are provided on their mutually confronting sides with orifices and are connected to one another in such a way that a flow connection occurs between the two headers (6a, 6b; 7a, 7b).

Abstract: In a condenser of a refrigerant cycle, a throttle portion is provided at a predetermined position in one of first and second header tanks to decompress refrigerant while refrigerant meanderingly flows within the one of the first and second header tanks. Therefore, refrigerant from the throttle portion is sufficiently mixed with refrigerant directly flowing from tubes into a downstream space of the throttle portion in the one of the first and second header tanks. Accordingly, even when gas refrigerant is directly introduced from a part of the tubes directly into the lower downstream space, the gas refrigerant can be effectively heat-exchanged with the refrigerant flowing from the throttle portion. As a result, it can restrict refrigerant from being discharged from the condenser in a gas-liquid two-phase state.

Abstract: A jumper tube assembly for a heat exchanger includes a first connector block having an attachment portion engaged to the heat exchanger, an outlet and an inlet for receiving refrigerant from the heat exchanger. A second connector block includes an attachment portion engaged to the heat exchanger, an inlet and an outlet. A jumper tube extends between the first and the second connector block. The jumper tube includes an inlet connected to the outlet of the first connector block and an outlet connected to the inlet of the second connector block. The jumper tube inlet and the jumper tube outlet are brazed to the respective first and second connector blocks. The first and second connector blocks are brazed to the heat exchanger.

Abstract: A heat exchanger for a vehicle is provided, where the heat exchanger includes core having first, and second sets of flow tubes extending between first and second headers and defining separate flow paths. One of the headers includes a first portion in fluid communication with the first set of flow tubes and a second portion defining a receiver/dryer chamber that is in fluid communication with the second set of flow tubes. A dryer is located within the receiver/dryer chamber.

Abstract: A heat exchanger for exchange of heat between a first fluid and a second fluid comprises a stack of pockets (1) mutually aligned in a longitudinal direction and having two header boxes (16, 17) that are mutually juxtaposed in a lateral direction. The first fluid is injected into an upstream connecting channel (12) by a longitudinal nozzle (22) passing through a heat exchanger end face (5) remote from the upstream connecting channel, and at least one other connecting channel (14). This longitudinal nozzle has a cross section of oblong general shape, whose greatest dimension is parallel to the greatest dimension of the pockets. The heat exchanger may be produced particularly in the form of an evaporator for an air-conditioning device for the passenger compartment of a vehicle.

Abstract: The invention relates to layered evaporators for use in motor vehicle air conditioners or the like, layered heat exchangers for providing such evaporators, and refrigeration cycle systems comprising the evaporator. At a specified intermediate portion of the heat exchanger with respect to the direction of juxtaposition of intermediate plates, a flat metal plate is interposed between one pair of intermediate metal plates providing a flat tube portion, or between two adjacent flat tube portions. The flat metal plate has a partition portion for blocking the passage of a fluid, a fluid passing hole for permitting passage of the fluid and an uneven flow preventing guide protuberance at an edge portion around the fluid passing hole. The flat plate of very simple structure is used according to the invention as the plate having a partition for providing heat exchanger core passes.

Abstract: A housingless plate heat exchanger including a plate stack defining fluid passages, at least one collecting tank with a peripheral edge enclosing one end of the plate stack, and a valve receivable in the collecting tank through an assembly opening of the soldered collecting tank and plate stack. The collecting tank and plate stack are soldered together and have a fluid opening. A method of manufacturing the heat exchanger includes the steps of assembling plates of the plate heat exchanger in a plate stack, placing a collecting tank on one end of the plate stack, soldering the plate stack and collecting tank together, and after the soldering step mounting a valve in the collecting tank.

Abstract: A multi-function heat exchanger is integrally provided with a plurality of heat exchanger sections, in which a difference in dimensional change caused by thermal expansion of the heat exchanger sections can efficiently be absorbed. In this multi-function heat exchanger, header pipes are divided by panel walls and a plurality of heat exchanging tubes are divided by a pseudo heat exchanging passage member into an oil cooler section and a capacitor section. A notch is formed in the header pipes between the panel walls.

Abstract: A layered heat exchanger, for example for use for motor vehicle coolers. To provide a turn portion in the heat exchanger for changing flow direction of a fluid flowing zigzag through a fluid circuit, a metal plate is provided at the upper or lower ends of a partition ridge with a fluid flow direction changing passage forming caved portion having a bottom wall of circular-arc cross section. Front and rear upper or lower tank portions are held in communication with each other through a fluid flow direction changing passage of approximately circular cross section and formed by the caved portions opposed to each other. The turn portion is diminished in stress concentrated thereon due to fluid internal pressure and given an increased resistance to pressure to effectively prevent tank side walls from breaking, consequently making it possible to decrease the metal plates thicknesses, to achieve a cost reduction by the decreased thickness and to assure an improved heat exchange efficiency.

Abstract: An evaporator having front and rear heat exchange assemblies arranged at air inlet and outlet sides, respectively, and adjacent to each other. Each heat exchange assembly includes a pair of upper and lower headers, and multiple refrigerant channels each having upper and lower ends connected to the upper header and lower headers. The upper and lower headers are internally provided with vertical partitions for internally dividing the headers into portions arranged laterally to reverse the direction of upward or rearward flow of a refrigerant through the refrigerant channels of the rear heat exchange assembly every specified number of refrigerant channels, and thereby provide at least one group of upward refrigerant channels in each of left and right halves of the rear heat exchange assembly. The evaporator can be used in a motor vehicle air conditioner.

Abstract: Fins such as corrugated fins or plate fins are formed with meandering projections. A fluid such as air strikes bent parts of the meandering projections or grooves at the back sides while flowing along the fins and becomes turbulent and therefore flows while meandering so as to be directed toward the surfaces of tubes, so flows not only contacting the front and back surfaces of the fins without leaving any dead space, but also striking the surfaces of the tubes. Due to this, no boundary layers are formed at the surfaces of the fins or tubes, so heat conduction is promoted and therefore the heat exchange efficiency between a first fluid such as a refrigerant flowing through the insides of the tubes and a second fluid such as air flowing outside is remarkably improved.

Abstract: A metal tank cap is integral with a reinforcing member via a narrow connection and covers an open end of the tank with adjacent reinforcement members being spaced from one another along each side of the core. The reinforcing members each have a pair of flanges extending outwardly from the sides thereof and have openings therein for receiving mounting anchors.

Abstract: The invention has as an object providing a two-block heat exchanger that can improve the heat exchange capacity by distributing the refrigerant evenly in the refrigerant path. The invention is a two-block heat exchanger, and the refrigerant distribution part provides two separate refrigerant paths R1 and R2 through which the refrigerant flows and an opening provided at both of the respective ends of these refrigerant paths R1 and R1. Among the two refrigerant paths R1 and R2, the open end of the space Sout 1 (refrigerant circulation space) on the exit side formed by the one opening of the one refrigerant path R1 is connected to the open end of the space Sin 2 (refrigerant circulation space) on the entrance side formed by one opening of the other refrigerant path R2. After the refrigerant flows into the refrigerant path R1 of each refrigerant distribution part, and refrigerant flows through the refrigerant path R2 of each of the refrigerant distribution parts.

Abstract: An exemplary heat exchanger includes increased stiffness to prevent buckling of a core. In some examples, an exemplary heat exchanger includes a core and a shaft at least partially positioned therein to increase stiffness of the core and located to limit movement of a heat exchange portion and to receive loads therefrom. In another example, an exemplary heat exchanger includes a core, a duct in fluid communication therewith, a load bearing member positioned adjacent to the core, and a mount which attaches the duct to the member. By connecting the duct to the member, the duct can transfer loads to the load bearing member. This protects the core being damaged by loads applied to the duct. The mount restrains the duct so to transfer loads, from the duct to the load bearing member. Such loads can be from external sources, such as inertia loads and vibration loads.

Abstract: A fluid cooler assembly comprises a vertically stacked first type and second different type of tubular panel subassembly construction integrated with a third subassembly of external corrugated fin construction positioned above and below each tubular panel subassembly. The first type tubular panel subassembly has an internal central flow region configured with a bilateral linear flow channeled subregion adapted for controlling the hydraulic behavior of the internal tubular coolant fluid flow. The second tubular panel subassembly has an internal tubular central flow channel region configured with a bilateral cross-flow channel region adapted for optimizing heat transfer.

Abstract: A stack type heat exchanger includes a plurality of unit frames stacked on one another, each unit frame including a tube made by combining a pair of plates and forming a path for refrigerant and upper and lower tanks disposed at upper and lower ends of the tube, a radiation fin provided between the stacked tubes, an inlet pipe and an outlet pipe provided at one side of the unit frames through which refrigerant enters and is exhausted, a first burr formed in the lower tank to protrude in a direction opposite to a direction in which the refrigerant flows, and a second burr formed in the upper tank to protrude in the same direction as the direction in which the refrigerant flows.

Abstract: A heat exchanger includes a header pipe, an inlet manifold, an outlet manifold, and coupling members. The header pipe includes a fluid circulation hole inside. The inlet manifold supplies a fluid to the fluid circulation hole of the header pipe. The outlet manifold discharges the fluid from the fluid circulation hole of the header pipe. The header pipe is connected to the inlet manifold and the outlet manifold though the coupling members.

Abstract: A pipe connecting member 7 has a fluid outlet passage 7B formed in communication with a fluid outlet pipe socket 721 provided thereon at a position on a lateral extension of the fluid outlet hole 9b, and a fluid inlet passage 7A formed with a fluid inlet pipe socket 722 provided thereon as displaced from a position on a lateral extension of the fluid inlet hole 7a. A corner portion 95 having a curved surface is formed between the fluid inlet passage 7A and a front header 4.

Abstract: A heat exchanger, particularly a flat-tube heat exchanger for a motor vehicle, which includes two coolant boxes and a tube block with an inlet tube attached to one of the boxes and an outlet tube attached to another of the boxes, and wherein each tube extends at least in part along one longitudinal side of the associated box and has at least one radial opening which communicates with a side opening formed in the box.

Abstract: An apparatus for brazing a heat exchanger, in particular a flat-tube heat exchanger, comprising a block of flat tubes and corrugated fins. The apparatus comprises a brazing frame that accommodates a tube-fin block within itself and which has two brazing bars arranged parallel to each other which are connected by tie rods. The brazing bars have a plurality of openings that are open toward one side, e.g., notches.

Abstract: A charge air cooler formed of copper or a copper alloy for withstanding high temperatures and high pressures is described. The charge air cooler is made to withstand temperatures over about 300° C. and pressures greater than about 40 bars in one embodiment, and temperatures over about 600° C. and pressures greater than 40 bars in additional embodiments. The heat transfer tubes are connected to manifolds at either end. The manifolds are preferably formed of copper or copper alloy with the tubes mechanically joined thereto. In one embodiment, the tubes are arranged in alternating angles with respect to each other. In a preferred embodiment, the tubes are arranged in offset alternating angles with respect to each other.

Abstract: This duplex-type heat exchanger is adapted to a vapor compression type refrigeration cycle in which a condensed refrigerant is decompressed and then evaporated. This duplex-type heat exchanger is integrally equipped with a subcooler S in which the condensed refrigerant exchanges heat with the ambient air A to be subcooled and an evaporator E in which the decompressed refrigerant exchanges heat with the ambient air A to be evaporated. Heat exchange is performed between the refrigerant passing through the subcooler S and the refrigerant passing through the evaporator E, to thereby cool the refrigerant in the subcooler S and heat the refrigerant in the evaporator E. Accordingly, according to this heat exchanger, a high refrigeration effect can be obtained while avoiding the pressure rise of the refrigerant.

Abstract: An end plate (20) has a fluid inlet hole (27) communicating with a front header (12b) and covered with a fluid diffusing portion (60) which is in the form of a semispherical plate and which has small holes (60a).

Abstract: A heat exchanger having a manifold defined by a plurality of connected closure pieces. A corner of the manifold is defined by the connected joint of three closure pieces, where one closure piece has a bent edge abutting an end of a second closure piece adjacent a generally flat section of a third closure piece. The bent edge of the one closure piece adjacent the manifold corner is a bend in a thin portion of the one closure piece, where the thin portion has a sheet thickness which is less than the sheet thickness of the adjacent portions of the one closure piece. Multiple corners of the manifold can be formed in this manner by thinning the thin and bending the portion, then connecting the closure pieces using solder to form a seal in the open cross section at the corners.

Abstract: Heat exchange inefficiencies found in round tube plate fin heat exchangers are eliminated in an aluminum heat exchanger that includes first and second headers (20), (22) and at least one flattened tube (24), (70) extending between the headers (20), (22). A plurality of generally parallel tube runs are defined and each has opposite edges. A plurality of plate fins (26), (50) are arranged in a stack and each has a plurality of open ended slots (34), one for each run of the tubes (24), (70). Each of the tube runs (24), (70) is nested within corresponding slots (26) and the fins (26), (50) with one of the edges (40) of the tube runs extending outwardly of the corresponding fin (34). The assembly is brazed together.

Abstract: The invention relates to a plate-type heat exchanger, in which at least one first flow passage (16) for a first medium is provided between two plates (12 and 14), which form a plate pair (13). A plurality of second flow passages (18), which are connected in parallel, for a second medium are provided between two plate pairs (13). To provide a novel, improved heat exchanger, which is easier to produce, it is proposed that the second, parallel-connected flow passages (18) are formed in each case by one plate (14, 12) from adjacent plate pairs (13).

Abstract: The heat exchanger has a plurality of stacked individual boxes for defining locally an inlet chamber and an outlet chamber for fluid. The heat exchanger includes an insert that comprises an inlet and outlet opening for fluid extended into the chambers by a body arranged for fluid communication of the opening with the first or second chamber. The insert that comprises a common part the body of which is provided with at least two openings capable of communicating with the first and second chambers, and it comprises a separating member for isolating the fluid currents between the opening and the chamber with which the opening must not communicate, the separating member being selected between two different shapes each corresponding to the fluid communication of the opening with one of the chambers.

Abstract: Metal side plates having projections are attached to fins at the ends of heat exchanger units, to thereby carry out heat exchange between cooling air flowing through spaces between the heat exchanger units, and the side plates. In comparison with a conventional radiator having no side plate, a heat exchanging area (heat radiating area) for the cooling air flowing through the spaces can be increased and, thus, a heat exchangeability (heat radiation capacity) can be enhanced in the present invention.

Abstract: A heat exchanger (1) consists of a plurality of disks (4) which are assembled to form a heat exchanger block or disk stack (16) and which are formed in each case from sheets (22) joined together in pairs and enclose between them at least one cavity designed as a duct. The cavity is delimited by the insides of the sheets (22). In the duct, an internal fluid flows in the longitudinal direction of the disks (4) and, on the outside of the disks, an external fluid flows transversely to the direction of flow of the internal fluid. Each sheet (22) has elevations (26, 33?) out of the disk plane, which are formed by material deformation and are directed both into the inside of the disk and toward the outside of the disk, the elevations (33?) directed toward the outside of the disk being configured as elongate stamped-out portions.

Abstract: A fluid conveying tube included in a vehicle cooler comprises on its inside first and second opposite longitudinal primary heat exchange surfaces, and flow-directing surface structures which are arranged on the primary surfaces. Each surface structure comprises a plurality of elongate directing elements projecting from the primary surfaces. The surface structures are alternatingly arranged on the first and second primary surfaces in such manner that directing elements, succeeding in the longitudinal direction of the primary surfaces, are alternatingly arranged on the first and second primary surfaces and are mutually inclined at a given angle (?). Each surface structure comprises a laterally extending row of mutually parallel directing elements. Thus an input fluid flow is divided into a number of parallel partial flows which follow a respective spiral-shaped flow path through the tube, whereby a high heat exchanging capacity is achieved.

Abstract: A heat exchanger includes: a receiving tube into which a fluid is introduced; a discharge tube for discharging a heat-exchanged fluid outwardly; a plurality of fins disposed between the receiving tube and the discharge tube, being bent at regular intervals so that air can pass at an outer circumferential surface thereof, and having a guide unit for guiding condensate water condensed at the surface thereof in one direction; and a tube disposed between the fins for heat-exchanging between a fluid passing therethrough and air passing the outer circumferential surface of the fin, and having a condensate water discharge path for discharging downwardly the condensate water guided by the guide unit. A condensate water remaining phenomenon between the fins can be reduced, and thus, the heat exchanging performance is improved.

Abstract: An aluminum radiator includes a core including a plurality of tubes through which a heat exchange medium flows and fins arranged between the tubes; and a header tank including a pair of header spaced apart from each other and having both ends coupled to the tube, a tank coupled to the header by a brazing and having a heat exchange medium passage formed therein, and end caps coupled to both opening portions of the tank, wherein the tube satisfies an inequality 10 mm?T?20 mm, where T denotes an outside width of the tube, and the tank has an inside height (H) of 41 mm or less and satisfies an inequality 1.5?H/T?2.5.

Abstract: The invention relates to layered evaporators for use in motor vehicle air conditioners or the like, layered heat exchangers for providing such evaporators, and refrigeration cycle systems comprising the evaporator. At a specified intermediate portion of the heat exchanger with respect to the direction of juxtaposition of intermediate plates, a flat metal plate is interposed between one pair of intermediate metal plates providing a flat tube portion, or between two adjacent flat tube portions. The flat metal plate has a partition portion for blocking the passage of a fluid, a fluid passing hole for permitting passage of the fluid and an uneven flow preventing guide protuberance at an edge portion around the fluid passing hole. The flat plate of very simple structure is used according to the invention as the plate having a partition for providing heat exchanger core passes.

Abstract: A layered heat exchanger, for example for use for motor vehicle coolers. To provide a turn portion in the heat exchanger for changing flow direction of a fluid flowing zigzag through a fluid circuit, a metal plate is provided at the upper or lower ends of a partition ridge with a fluid flow direction changing passage forming caved portion having a bottom wall of circular-arc cross section. Front and rear upper or lower tank portions are held in communication with each other through a fluid flow direction changing passage of approximately circular cross section and formed by the caved portions opposed to each other. The turn portion is diminished in stress concentrated thereon due to fluid internal pressure and given an increased resistance to pressure to effectively prevent tank side walls from breaking, consequently making it possible to decrease the metal plates thicknesses, to achieve a cost reduction by the decreased thickness and to assure an improved heat exchange efficiency.

Abstract: A vehicle radiator including inlet and outlet headers, a soldered core having a plurality of coolant flat tubes joining the inlet header and the outlet header with cooling fins on opposite sides of the coolant flat tubes, and a multifunction flat tube on at least one side of the core. The multifunction flat tube has a greater section modulus than the coolant flat tubes, and is soldered to adjacent cooling fins and the inlet and outlet headers whereby the multifunction flat tube carries coolant from the inlet header to the outlet header. The multifunction flat tubes each also have an inner flow resistance which is substantially smaller than the inner flow resistance of individual coolant flat tubes whereby more coolant flows through each multifunction flat tube than flows through an individual coolant flat tube per unit time.

Abstract: Reinforcement holes and tube holes are formed so as to be of the same size, and the interval between the reinforcement hole and the tube hole adjacent to the reinforcement hole is made equal to the interval between the adjacent tube holes.

Abstract: A method for manufacturing a fin for a heat exchanger includes the steps of forming an intermediate pre-formed plate, which has adjacent zigzag strips, by passing a flat plate material between a pair of first processing rollers, and forming a fin by passing the intermediate pre-formed plate between a pair of second processing rollers to bend the zigzag strips at a portion connecting adjacent zigzag strips. The fin includes a plurality of waving strips arranged adjacent to each other in the transverse direction, which are offset in the longitudinal direction. The adjacent waving strips are connected only between the flat portions of the waving strips at a connection length less than or equal to a plate thickness. The fin may be manufactured readily and inexpensively. A heat exchanger using the fin as an inner or outer fin may exhibit superior performance.

Abstract: A heat exchanger is assembled in a simple and cost-effective way and needs a relatively low space requirement. According to the invention, the tubes (11) are expanded at the tube ends (16) in such a way that the tube ends (16) are of rectangular design in cross section. The tube ends (16) have parallel long connecting surfaces (18) which are brought into bearing contact with long connecting surfaces (18) of adjacent tube ends (16). Furthermore, the tube ends (16) have short connecting surfaces (22), onto which the collecting tanks (23, 29) are placed with their legs (24, 25) or collars (30, 31). A space-saving heat exchanger can be produced in a simple way by soldering the long connecting surfaces (18) together, on the one hand, and by soldering the short connecting surfaces (22) to the collecting tanks (23, 29), on the other hand.

Abstract: A heat-exchange module has a main exchanger and at least one secondary exchanger, each having a body with fluid-circulation tubes, and cooling fins, the secondary exchanger being fixed onto the main exchanger. The module includes a set of fins common to the main exchanger and to at least one secondary exchanger, these fins being mounted on the tubes of the main exchanger and projecting from this exchanger, the projecting parts of the fins including cut-outs for accommodating the tubes of the secondary exchanger. Fastenings secure the secondary exchanger in the position in which its tubes are engaged in the cut-outs.