Abstract: The method and apparatus for manufacturing of folded-fin heat sink assemblies provide laser welding of the folded-fin assembly to the base, core or other heat-absorbing mass, at selected locations, prior to brazing or otherwise bonding. This ensures proper positioning of the folded-fin assembly relative to the heat-absorbing mass, and proper spacing between adjacent fins.

Abstract: In a method of manufacturing a plate type titanium heat exchanger in which a plurality of titanium herringbone plates are laminated and flow paths are formed between the respective herringbone plates, after brazing materials are charged or coated to the joints between the herringbone plates, respectively, the herringbone plates are placed in a vacuum heating furnace, subjected to vacuum degas processing while being gradually heated, and joined to each other by brazing by being more heated after a prescribed vacuum pressure has been obtained.

Abstract: The present invention provides a method of at least one of increasing airflow around a plurality of tubes in a heat exchanger, and increasing the web in a header around such plurality of tubes, wherein the method includes the steps of providing a predetermined plurality of tubes having a predetermined end configuration, and a header having a predetermined number of openings. The predetermined number of openings are configured in a predetermined staggered array corresponding to the predetermined plurality of tubes, disposed in a heat exchanger. Finally, the method secures an end of each predetermined plurality of tubes into the predetermined number of openings in said header.

Abstract: The invention relates to a heat exchanger comprising two manifolds (10). Profiled pipe sections (11) are accommodated with a lamella configuration (12) between said manifolds. According to the invention, an obstructing means (13) for preventing the flow of solder is provided on the exterior of the profiled pipe section (11) between the manifold (10) and the lamella configuration (12). The invention also relates to a method for producing a heat exchanger. The invention provides that the obstructing means (13) is formed on the profiled pipe sections (11) before the sections are cut from a profiled pipe billet.

Abstract: A method for manufacturing a heat transfer member comprises the steps of: subjecting elongated materials to be worked, which are made of metallic thin sheets, to a continuous press forming utilizing a plurality of press-forming devices to form heat transfer faces each having a prescribed shape, while transferring the materials in a prescribed feeding direction, which is in parallel with a longitudinal direction of the materials; and welding two materials, which have been subjected to the press forming, of the elongated materials together utilizing a welding device to form a heat transfer member having substantially a tubular shape.

Abstract: An aluminum based header plate, for a tubular heat exchanger for a motor vehicle, has an external coating on its outer face. An end portion of each heat exchanger tube is received in a corresponding through hole in the header plate. The tube end portions have a predetermined cross section and an external coating, and secured to the header plate by brazing. Each through hole is made by a slitting operation followed by configuration of the through hole within a selected zone of the header plate, this zone being press-formed so as to form in the outer face of the header plate a collar portion in that zone. The internal transverse cross section of each collar portion is substantially identical to the predetermined cross section of the corresponding tube end portion. After the tube has been introduced into the through hole, which extends through the collar portion, there is surface contact between the respective external coatings of the collar portion and of the tube end portion.

Abstract: The present invention relates a method of manufacturing a high fin density heat sink comprising the steps of: aligning a plurality of length sections side by side in a mutual parallel arrangement, said length sections having a cross-section comprising a first end portion, a second end portion and a web portion connecting said first and second end portions, said first and second end portions having a width wider then the width of the web portion; clamping the parallelly arranged length sections together, such that said first and second end portions of adjacent parallel length sections are abutting against each other; and bonding the length sections together by applying at least one friction stir welding (FSW) seam across the end portions of the parallelly arranged length sections.

Abstract: In a brazed condenser for an air conditioner, a collecting tube connected with a collector is prefabricated as a one-piece tube. The collecting tube is connected by tack weld seams with the collector before brazing the collecting tube and the collector together.

Abstract: A heat exchanger assembly that includes a tube having an internal surface and an external surface. An aluminum-based component is disposed adjacent to the tube, the aluminum-based component has an aluminum-based material that has a magnesium content that is above 0.3%, wherein the aluminum-based component is joined to the tube using a brazing flux applied during a controlled atmosphere brazing process.

Abstract: In a manufacturing method of a heat exchanger including a core portion having a plurality of tubes and a plurality of radiation fins connected to surfaces of the tubes, and a tank portion communicating with the tubes, a preheating step, a brazing step, a gradual cooling step and a cooling step are performed in this order. In the preheating step, temperature of the tank portion having a large heat capacity is increased earlier than that of the core portion having a small heat capacity. Therefore, the temperature of the tank portion is rapidly increased, and the temperature of the core portion is obediently increased in accordance with the temperature increase of the tank portion.

Abstract: An automobile climate control system has a coolant dispersing device to allow coolant to flow. A heat exchanger cools the coolant. A manifold block allows the coolant to transfer between the coolant dispersing device and the heat exchanger. The manifold block is in communication with the heat exchanger and the coolant dispersing device. At least one separately formed clasp is fixedly mounted to the manifold block. The at least one clasp has separate legs to fixedly mount the at least one clasp to the heat exchanger. The at least one clasp has a first flange member. A first end of the first flange member is fixedly mounted to an aperture in the manifold block.

Abstract: An improved method for producing a basic B tube configuration for a folded heat exchanger tube (26). A braze clad metal strip (10) having inner (1) and outer (0) surfaces and a opposed edges (12) is progressively formed over and in by a series of progressive roller stations (14A, 16A-14J, 16J) until the lower edges (12) on a pair of central abutting flanges 18 centrally engage the strip inner surface (1). Between two of the roller stations (G and H), a powered dispense valve (20) with nozzle (22) continuously dispenses a bead (24) of material containing flux or, alternatively, flux and braze material. Bead (24), rather than being a thin stripe, is a thick semi cylindrical shape, with substantial viscosity. As the flanges (18) move into abutment and the downstream roller stations, the flange edges (12) are forced down into the bead (24), some of which is pumped up between the outer surfaces (0) of the abutted flanges (18), yielding a good, solid braze joint between the two.

Abstract: Manifold for a heat exchanger intended to be joined by brazing or soldering to heat transfer tubes. A portion of a surface of the manifold that will be joined to the tubes is proved with at least one recess in which a brazing material is mechanically locked.

Abstract: An improved method for producing a basic B tube configuration for a folded heat exchanger tube (26). A braze clad metal strip (10) having inner (I) and outer (O) surfaces and a opposed edges (12) is progressively formed over and in by a series of progressive roller stations (14A, 16A-14J, 16J) until the lower edges (12) on a pair of central abutting flanges 18 centrally engage the strip inner surface (I). Between two of the roller stations (G and H), a powered dispense valve (20) with nozzle (22) continuously dispenses a bead (24) of material containing flux or, alternatively, flux and braze material. Bead (24), rather than being a thin stripe, is a thick semi cylindrical shape, with substantial viscosity. As the flanges (18) move into abutment and the downstream roller stations, the flange edges (12) are forced down into the bead (24), some of which is pumped up between the outer surfaces (O) of the abutted flanges (18), yielding a good, solid braze joint between the two.

Abstract: An article includes turbulation material bonded to a surface of a substrate via a bonding agent, such as a braze alloy. In an embodiment, the turbulation material includes a particulate phase of discrete metal alloy particles having an average particle size within a range of about 125 microns to about 4000 microns. Other embodiments include methods for applying turbulation and articles for forming turbulation.

Abstract: A coolant tube for use in a heat exchanger is manufactured by using a plate member as follows: the plate member is folded in substantially regular distances to form a plurality of folded portions; and two opposite ends of the plate member are joined in a manner that end parts of the folded portions are brought into contact with flat portions of the plate member to thereby form coolant flow passages.

Abstract: A method of manufacturing radiators by joining a corrugated fin to a base plate, characterized by low costs and prevention of thermal deformation of the corrugated fin due to low-temperature soldering. A first soldering at the lower ends of the corrugated fin is conducted by a first soldering alloy in a recess heated by a heating plate in a mobile solder tank filled with the molten first soldering alloy. A second soldering alloy is heated by a heating plate on a base plate and the molten second soldering alloy is used to conduct a second soldering. When the corrugated fin is placed on the base plate, pressed and heated, the first and second solders are melted to join the corrugated fin to the base plate.

Abstract: An automobile climate control system having a liquid dispersing device to allow coolant to flow. The system also utilizes a heat exchanger to cool the liquid. A manifold block handles the transfer of coolant between the coolant dispersing device and the heat exchanger. The manifold block is in communication with the heat exchanger and the coolant dispersing device; and at least one clasp connects the manifold block to the heat exchanger. A fitting clasp made from the clad material couples the heat exchanger to the at least one clasp.

Abstract: The present invention relates a method of manufacturing a high fin density heat sink comprising the steps of: aligning a plurality of length sections side by side in a mutual parallel arrangement, said length sections having a cross-section comprising a first end portion, a second end portion and a web portion connecting said first and second end portions, said first and second end portions having a width wider then the width of the web portion; clamping the parallelly arranged length sections together, such that said first and second end portions of adjacent parallel length sections are abutting against each other; and bonding the length sections together by applying at least one friction stir welding (FSW) seam across the end portions of the parallelly arranged length sections.

Abstract: A method for producing longitudinally welded helically corrugated metal tubing, wherein a metal strip pulled from a strip supply is formed into tubing with a longitudinal slit, the longitudinal slit is sealed by welding and the corrugation is produced by a corrugation tool that is supported eccentrically and at an angle to the tubing axis, is freely rotatable in a rotationally driven corrugator head, and rolls off the surface of the tubing. The metal strip as well as the uncorrugated metal tubing are advanced by a feed device that is provided between the welding point and the corrugation unit. A second feed device (8) engages the corrugated tubing (7) directly behind the corrugation unit (6), and the feed rate of the second feed device is slower than the forward feed rate of the corrugated tubing (7) which results from the pitch of the corrugator disk and the rotational speed of the corrugator head.

Abstract: A header box for a heat exchanger includes a hollow unitary body having four generally flat sides forming a generally quadrilateral cross-section. End plates are located at, and coupled to, each end of the unitary body. One generally flat side has a plurality of plug openings located. The flat side opposite the one generally flat side having the plug openings includes a plurality of tube openings.

Abstract: In a manufacturing method of a heat exchanger including a core portion having a plurality of tubes and a plurality of radiation fins connected to surfaces of the tubes, and a tank portion communicating with the tubes, a preheating step, a brazing step, a gradual cooling step and a cooling step are performed in this order. In the preheating step, temperature of the tank portion having a large heat capacity is increased earlier than that of the core portion having a small heat capacity. Therefore, the temperature of the tank portion is rapidly increased, and the temperature of the core portion is obediently increased in accordance with the temperature increase of the tank portion.

Abstract: A method of producing an encased honeycombed body, in particular a supporting body of a catalytic converter, includes the steps of producing a honeycombed body by stacking and/or winding sheet metal layers, of which at least some are structured sheet metal layers, so that the honeycomb body has channels through which a fluid can flow. A sleeve is introduced into a tubular jacket. The sleeve is smaller in the axial direction than the axial length of the honeycomb body and the tubular jacket. The sleeve has an outer circumferential surface which substantially bears against a part of the inner wall of the tubular jacket. The honeycomb body is introduced into the tubular jacket and into the sleeve and is connected to the tubular jacket and the sleeve. If required, the tubular jacket may also be connected to the sleeve.

Abstract: A process for producing a compact catalytic reactor, in which reaction spaces or heat-transfer spaces are formed by stacking at least partially structured plates alternately one on top of the other, a catalyst is introduced into the reaction spaces, and the plates are provided with a layer of solder at least in the edge region, but not in the region provided with catalyst material, and, after stacking them one on top of the other, are soldered to form a reactor. In addition, the plates may be provided with a bent-up edge region a for easy positioning and for increasing the leak tightness. Finally, an unstructured intermediate plate may also be respectively provided between the structured plates.

Abstract: An apparatus and method for making a heat exchanger tube (14) for a heat exchanger (10) in which a continuous insert (26), having convolutes transverse to the length of the tube are located into a continuous shell as the shell is being formed. After placing the insert (26) into the partially open shell, the shell is closed and sealed as it passes through a bonding device (64) to seal the longitudinal edges of the shell to each other and the insert to the internal walls of the tube. The continuous shell with the inserted fin insert is subsequently sliced to produce individual cooling tubes.

Abstract: A method for attaching mounting features to an aluminum heat exchanger tank during its formation is provided. A mounting feature with at least one extension protruding from it is provided and a heat exchanger tank is formed with at least one opening defined in it, apart from fluid flow openings. The method includes the step of attaching the mounting feature to the tank such that the extensions are received within the openings in the tank and the extensions are deformed to secure the mounting feature in place.

Abstract: In a brazed condenser for an air conditioner, such as a motor vehicle air conditioner, a collecting tube connected with a collector is a prefabricated as a one-piece tube which is connected by tack weld seams with the collector before brazing the collecting tube and the collector together.

Abstract: During the course of bending and deforming a strip-shaped metal plate in multiple stages through use of a press roller, to thereby constitute a tube base having a closed cross section, slime-like flux is applied to solely the portions of the metal plate to be brazed, and the tube base is heated in a heating furnace, to thereby braze the portions to be brazed. Accordingly, waste of the flux is eliminated. Further, flux coating can be performed on a tube forming line, thus simplifying facilities.

Abstract: The application discloses a method of joining at least four heat transfer plates (2) to a plate package for a plate heat exchanger. Each heat transfer plate (2) comprises an outer edge portion (10) extending around the heat transfer plate in its edge area and an inner edge portion (11) extending around the heat transfer plate inside the outer edge portion (10). The heat transfer plates (2) are joined in pairs at a first contact plane to at least two plate pairs (16) along said inner edge portions (11). An outer edge portion of one of said plate pairs is brought to abutment at a second contact plane (20) to an outer edge portion of another of said plate pairs. The outer edge portions (10) are welded. The application also discloses a plate package produced in this manner.

Abstract: A heat exchanger and method for cooling power electronics modules. The power electronics module transferring heat generated during operation to the heat exchanger through a thermal base of the power module. The heat exchanger being directly bonded to the thermal base and comprising a metal foam. The metal foam having a network of metal ligaments forming numerous open cells to provide porosity. The metal ligaments are aligned to provide a higher metal density in cross-sectional planes of the foam perpendicular to the intended direction of heat flow.

Abstract: Method of manufacturing a plate heat exchanger of the type comprising a plurality of plates and possibly of separating elements, made of a brazable material, which define circuits for the circulation of fluids and are assembled to one another by brazing. The brazing takes place after the foils of brazing alloy have been deposited on the regions to be brazed. The foils and the regions to be brazed are co-rolled before the brazing. The invention is applicable to the reboiler-condensers of air separation plants.

Abstract: An aluminum alloy fluid heat exchanger comprises first and second elongate, generally flat, aluminum alloy fluid heat exchanger tubes, each having an upper and a lower surface and having a fluid port inlet and a fluid port outlet. The first tube has a series of small protrusions formed at its lower surface and the second tube has a matching series of protrusions formed at its upper surface, the first tube being stacked on top of the second tube with the protrusions on the first tube in contact with the protrusions on the second tube. A thin sheet of a dissimilar metal, preferably cold rolled steel having a thickness of about 0.3 millimeters is installed between the protrusions on the first and second tubes. The protrusions provide a spacing of at least about 0.42 millimeters between major portions of the first and second heat exchanger tubes. A corresponding method of constructing an aluminum alloy heat exchanger is described.

Abstract: A method for depositing a thermal interface onto a heat sink including the selection of a highly thixotropic compound formed into a bulk form so as to present a tip which is melted upon contact with a preheated heat sink. The tip cross section preferably corresponds to the cross section of the heat sink. Upon depressing a tip of the compound against the heat sink a resulting vacuum therebetween cooperates with the ambient air pressure to preclude migration of the melted compound beyond the exterior of the tip such that the compound is deposited on the heat sink in the desired cross section form. Upon displacement of the tip from the heat sink, the ambient air pressure precludes subsequent migration of the compound onto the heat sink precluding a build up of the deposited material thereon. The component may then be subsequently pressed against the subsequent heat sink without a deformation of the compound tip precluding a subsequent deposit.

Abstract: A method of production of an inexpensive corrosion-resistant heat exchanger made of stainless steel including the steps of electroplating chrome to a thickness of 15 &mgr;m on at least one of the end faces of a plurality of first and second shaped plates made of stainless steel alternately stacked in the thickness direction so as to form a chrome-based brazing filler metal layer, then electrolessly plating or electroplating Ni-P to a thickness of 35 &mgr;m on the chrome-based brazing filler metal layer to form a nickel-based brazing filler metal layer. The first and second shaped plates are brazed together through the chrome-based brazing filler metal layer and the nickel-based brazing filler metal layer to obtain a high corrosion resistant heat exchanger. Due to this, a high corrosion resistance brazing filler metal containing an Ni-Cr28-P8-etc. alloy composition is obtained at the two end faces of the first and second shaped plates.

Abstract: The end faces of the edge portions of a flat plate, which have been respectively cut into a given shape according to a trimming operation, are then respectively face-struck into a linear shape. Also, in the trimming operation, each of the edge portions of the flat plate is cut into a shape having a larger dimension than that of a finally required shape thereof, and the thus produced excess length portions of the edge portions are worked by compressing when a pair of semidivided cylindrical portions are butted against each other. Since a connecting portion situated between the pair of semidivided cylindrical portions is always pressed with a given pressure, the working properties of the connecting portion in the molding operation are prevented from being revived.

Abstract: Heat sinks are provided that achieve very high convective heat transfer surface per unit volume. These heat sinks comprise a spreader plate, at least two fins and at least one porous reticulated foam block that fills the space between the fins.

Abstract: A method of making a heat exchanger includes assembling one or more heat exchange cells. Each heat exchange cell is assembled by providing a top plate having an inlet aperture at one end thereof, an outlet aperture at the other end thereof, a first surface, a second surface and peripheral edges; and providing a bottom plate having an inlet aperture at one end thereof, an outlet aperture at the other end thereof, a first surface, a second surface and peripheral edges. The second surfaces of the top and bottom plates are juxtaposed with one another so that the inlet and outlet apertures of the plates are in substantial alignment with one another. The peripheral edges of the top and bottom plates are attached to form a high pressure chamber between the second surfaces of the plates. After being assembled, each individual heat exchange cell is tested before being attached to other heat exchange cells. The testing may include pressure testing of the heat exchange cell.

Abstract: A method of fabricating a plate heat exchanger comprising the steps of providing heat transfer plates having fluid passage openings therein; disposing a metallic gasket assembly of a predetermined configuration around the fluid passage openings and perimeter portions of each heat transfer plate; alternating the heat transfer plates in a stacked relationship in a reverse orientation to form a plurality of flow cavities defined by the surfaces of the heat transfer plates and the metallic gasket assemblies; positioning turbulator members having corrugated grooves within each of the flow cavities for causing fluid turbulence; applying a braze alloy around the metallic gasket assemblies and on the surface of the heat transfer plates; and heating the braze alloy coated heat transfer plates to sealingly interconnect with each metallic gasket assembly and with one another.

Abstract: The invention related to a method in the manufacture of a plate heat exchanger (1), preferably a so-called recuperator. This has flow channels arranged between the plates, every other channel being designed to accommodate the flow of a heat-emitting medium and every second channel the flow of a heat-absorbing medium. The flow channels for one of the media, preferably the heat-absorbing medium, are connected in parallel to manifolds for the said medium. The plates also have a raised pattern designed to produce a counter-flow section and two cross-flow sections in the recuperator, one on either side of the counter-flow section, the cross-flow sections having a lower raised pattern height than the counter-flow section. By means of a punching and pressing operation openings (4′, 6′) are made in each plate, with side walls formed around the edges of the openings. Following a joining process, in which the side walls undergo pressure resistant jointing, the side walls from walls of the manifolds (4, 6).

Abstract: A method of attaching pipes. A header pipe is divided into two longitudinally. Header bores are made into one header part, tubes are inserted into each header bore, and the tubes are attached to the header part. One method of attachment is via automatic welding from the inside of the header part. Both welding and inspection are much facilitated by means of the instant method. After the tube(s) have been attached to the header, the attachments are inspected both from the inside and the outside of the header part, and finally the two header parts are re-attached, and their re-attachment is inspected.

Abstract: A tube is formed by brazing first and second plates, and is connected to a pipe through a connection block being brazed to a contacting surface of the first plate. A brazing material is clad on an inner surface of the first plate opposite to the contacting surface, and a hole penetrating through the first plate is formed in the first plate at a position corresponding to the connection block. Thus, during brazing, the brazing material clad on the inner surface of the first plate is supplied to the contacting surface through the hole by capillary phenomenon, so that the connection block is brazed to the first plate. As a result, an apparatus formed by brazing plural metal members, such as the tube of an oil cooler, is produced in low cost.

Abstract: There is disclosed a heat exchanger made of an aluminum alloy having a radiator part (10) and an oil cooler part (11) in combination and manufactured integrally by the brazing method, wherein a refrigerant tank (13) for covering and sealing the oil cooler part is made of an aluminum alloy, an aluminum alloy containing Si in an amount from more than 7.0 wt % to 12.0 wt %, Fe in an amount from more than 0.05 wt % to 0.5 wt %, Cu in an amount from more than 0.4 wt % to 8.0 wt %, Zn in an amount from more than 0.5 wt % to 10.0 wt %, and the balance of aluminum and inevitable impurities is used as a filler material of brazing sheets that are used for the oil cooler part and are brazed in the tank, and the refrigerant tank is assembled integrally with the radiator part and the oil cooler part by brazing with the brazing material.

Abstract: Fins and tubes are brazed by brazing material spread on the inside of bent portions. As the interval between the fins and the tubes does not increase upon melting the brazing material, the tubes and the fins can be easily piled and assembled with each other, and the operability in assembling a heat exchanger can be improved. Further, as the brazing material remains mainly around the bent portions, most parts of the fins and the tubes are not covered with the brazing material, and there is no diffusion of the brazing material at the heating of the brazing step. Accordingly, heat exchanging performance of the heat exchanger can be improved, and even if the thickness of the fins and that of the tubes are reduced, the occurrence of the erosion can be prevented.

Abstract: A heat exchanger for vehicles comprises firstly a heat-exchanger assembly consisting of flat liquid-conveying tubes and surface-enlarging means, secondly an inlet tank, and thirdly an outlet tank. The inlet tank and the outlet tank have a connection plate with a number of connection holes for the tubes. At each hole, the plate has a projecting connecting sleeve element. Each tube has at its ends a widened main portion which is accommodated on said connecting sleeve element. A rounded transitional area is formed between the connection plate and each connecting sleeve element, and the main portion is inserted in the conecting sleeve element and is applied with its outside against the inside of the connecting sleeve element. Each tube has at its ends an end portion which is widened in relation to the main portion, merges with the main portion and is applied against the transitional area.

Abstract: A method of making a heat exchanger core (56) having a stack of fins (60) having collared holes through which tubes (30) are laced. An overlying fin is supported on an underlying fin by collars (90) around the holes in one of the fins. Leading lengthwise end portions (66) of the tubes are corrugated and each tube is laced, via its leading lengthwise end portion, through a respective set of aligned holes in the fins. Then the tubes are mechanically staked to at least some of the fins in the stack by expanding the cross sections of the corrugated leading lengthwise end portions of the tubes against the collared holes in those fins through which the corrugated leading end portions pass (FIGS. 14-18).

Abstract: A method of manufacturing a heat exchanger comprising a core assembly having a plurality of tubes connected by an array of fins, with ends of the tubes extending from the fin array on at least one side of the core assembly and resilient, polymeric grommets disposed around the tube ends. The heat exchanger includes a tank portion for receiving fluid entering or leaving the core assembly and a header portion having openings to receive the tube ends and grommets to create a sealed, fluid-tight tube-to-header joint. There is provided a reinforcing member across the opening of the tube ends extending from the tube end opening to the portion of the tube end around which the grommet is disposed without substantially extending into the fin array portion of the core assembly. The header portion comprises a substantially planar base having openings therein with side and end walls extending out of the plane of the base and connected by one or more fluid-tight welds to the tank portion.

Abstract: A dual-fluid heat-exchanging system (20) incorporating a primary heat exchanger (22) and a secondary heat exchanger (24) is provided. The primary heat exchanger (22) incorporates a core (40) configured to extract heat (32) from a primary fluid (34). An input tank (30) and an output tank (28) are coupled to the primary-exchanger core (40) and function as reservoirs of the primary fluid (34) and as manifolds routing the primary fluid (34) through the core (40). The secondary heat exchanger (24) incorporates an extruded metal core (26) coupled to the primary-exchanger input tank (30) or the primary-exchanger output tank (28) and configured to transfer heat (32) from a secondary fluid (52) into the primary fluid (34) within the primary-exchanger input tank (30) or output tank (28). An input manifold (62) and an output manifold (64) are coupled to the secondary-exchanger core (26) and route the secondary fluid (52) through the core (26).

Abstract: A heat pipe device having precisely dimensioned vapor passages and liquid passages is formed by laminating a multitude of layers of foil. Each foil layer has a pattern of perforations and half-etchings formed therein. Lamination of said foil layers provides a highly efficient heat transfer device capable of carrying structural loads.

Abstract: A tube for a heat exchanger has a cross-section having two opposed side walls and two opposed ends. The ends have curved portions and one of the ends has a double wall comprising an inner wall and an outer wall. One of these side walls extends to form the outer wall and the other of the side walls extends to form the inner wall. Each of the outer and inner walls has a respective extremity, the inner wall being offset inwardly to accommodate the extremity of the outer wall and the extremity of the inner wall deviating away from the outer wall.

Abstract: A method of repairing a crack in a boiling water reactor shroud with a clamp having pins eccentrically mounted on disks connected by a structural member includes inserting the pins into openings formed in the shroud on opposite sides of the weld and turning the disks to rotate the pins toward the weld such that edges of the holes are engaged by the pins to transmit loads from the shroud to the structural member rather than the weld. A seal member is mounted in compression between a flange at an inboard end of at least one of the pins and an inner surface of the shroud to control leakage through the opening in the shroud.