Abstract: An improved method is provided for assembling a heat exchanger by mechanically joining one or more pairs of tubes with fins arranged in a fin pack. The method involves a novel external expansion technique that is performed between pairs of tubes and internally of the fin pack, in a manner that enhances the mechanical joint strength and metal-to-metal contact between the tubes and fins of the heat exchanger, while enabling the assembly process to be reduced to a single operation. Consequently, the method of this invention avoids the shortcomings of internal expansion techniques, and provides a significant improvement over prior art external expansion techniques. The method of this invention also yields a novel heat exchanger configuration, in which only facing surfaces of the tube within the fin pack are deformed in order to expand and mechanically join the tube to the fins. Finally, the present invention also encompasses a unique expansion tool for externally expanding the tube portions within the fin pack.

Abstract: A heat exchanger apparatus for a plurality of cooling circuits using the same coolant is proposed, which includes a first fluid tank (18) arranged to be supplied with the coolant and divided into a plurality of compartments (24, 26, 28) for supplying at least two sub-banks (FP, FS) of tubes belonging to the same bank (10) of heat exchanger tubes (12), the bank (10) being mounted at one end on the first fluid tank (18) and at another end on a second fluid tank (22) that is divided into a plurality of compartments (38, 40, 42) communicating with the sub-banks, outlet means (48, 36) being provided on the first and second fluid tanks to permit the connection of each sub-bank to a cooling circuit.

Abstract: A heat exchanger is provided with a parallel array of heat exchange tubes and mounting plate assemblies on opposed ends of the tubes for achieving communication from one tube to the next. The mounting plate assembly includes a fitting plate stamped to define short discontinuous channels. A seal plate is registered with the fitting plate and includes apertures, such that a pair of apertures register with each channel. The heat exchange tubes extend through the apertures of the seal plate to provide communication with a channel formed in the fitting plate. A sealant surrounds portions of the tubes adjacent the apertures in the seal plate.

Abstract: An improved refrigerant evaporator which uses a plurality of circuits to maximize inner and outer surface areas and cross-feed refrigerant to quickly and uniformly remove heat from static solutions within a containment tank. Refrigerant is equally fed to a plurality of individual circuits 20 from a common inlet manifold 2 located at one side of the coil. Individual circuits 20 alternately incorporate, and do not incorporate, crossover members 23 to carry the incoming refrigerant to the each side of the evaporator such that it simultaneously flows inward from both sides. Individual circuits 20 are additionally arranged such that all which are contained within an evaporator are of identical length thus making the invention particularly well suited for use with non-azeotrope refrigerants. Further, the device does not immerse joints or connections in the cooled medium and performs well in corrosion environments.

Abstract: A condenser coil and a method of manufacturing thereof, with an extended heat transfer surface attached to a serpentine coil such that the assembly can be folded into a U-shape cross section to allow for cross flow of air through and around the condensing coil. In one embodiment, wires are attached to the serpentine coil in a preliminary stage of manufacture across a width of the coil along its length and the coil is wrapped into a U-shape. In a second embodiment, a planar flat plate is attached to a serpentine coil and the coil and flat plate are wrapped into a U-shape.

Abstract: A condenser particularly for use in automobile air conditioning system, the condenser including a pair of headers having their inner spaces divided by partitions so as to form a cooling medium flow path in a zigzag patterns including an inlet side group of paths and an outlet side group of paths, side group of paths is 30 to 60% of that of the inlet side group of paths.

Abstract: A condenser for use in air conditioning systems, including a core and headers, the core comprising tubes and corrugated fins sandwiched between the tubes, wherein:width of each tube: 6.0 to 20 mmheight of each tube: 1.5 to 7.0 mmheight of each coolingmedium flow path: 1.0 mm or moreheight of each fin: 6.0 to 16 mmfin pitch: 1.6 to 4.

Abstract: A coil assembly for use in a heat exchanger having air flowing in a predetermined direction. The coil assembly comprises a plurality of parallel linear tubes, a plurality of return tubes interconnecting the linear tubes, and a plurality of fins. Each linear tube has a central portion with an elliptical cross-section and two end portions with round female sockets having circular cross-sections. Each return tube has two end portions with circular cross-sections. Each end portion of a return tube fits into a round female socket of a linear tube regardless of the orientation of the major axes of the linear tubes. The major axis of the elliptical cross-section resides at an oblique angle with respect to the direction of air flow. Each fin comprises a planar sheet of a heat-conductive material with a plurality of holes. The central portion of a linear tube extends through each hole. Each fin securely contacts each linear tube extending therethrough such that heat transfer therebetween is enhanced.

Abstract: The present invention includes fins that are juxtaposed at narrow intervals. One side of the fins serves as an upstream side, and the other side thereof serves as a downstream side. Heat exchange air passes through the fins. A bent portion is provided at a substantially middle portion of the fins in the longitudinal direction of the fins, and the fins are bent at the bent portion at a predetermined angle. Heat exchange pipes are provided to penetrate the fins and are arranged in an upstream-side front row and a downstream-side rear row. U-bend portions are provided to connect end portions of adjacent heat exchange pipes. Passageways for guiding a heat exchange medium are formed by the heat exchange pipes and U-bend portions.

Abstract: A heat exchanger is provided with a parallel array of heat exchange tubes and mounting plate assemblies on opposed ends of the tubes for achieving communication from one tube to the next. The mounting plate assembly includes an outer fitting plate stamped to define short discontinuous channels. An inner fitting plate is registered with the outer fitting plate and includes apertures, such that a pair of apertures register with each channel. A seal plate is registered with the inner fitting plate and further includes apertures registered with the apertures in the inner fitting plate. The heat exchange tubes can be inserted through the registered apertures of the seal plate and the inner fitting plate to provide communication with a channel formed in the outer fitting plate. A sealant is then injected between the inner fitting plate and the seal plate for sealing the interface between the tubes and the mounting plate assembly.

Abstract: The present invention is directed to a heat exchanger, such as an evaporator for an automotive air conditioning refrigeration circuit. The heat exchanger includes a serpentine tube in which the interior space is divided by a plurality of parallel partition wall into a corresponding plurality of essentially parallel passages through which refrigerant fluid flows, and inlet and outlet mechanisms connected to the two opposite terminal ends of the serpentine tube, respectively. The inlet mechanism comprises a cylindrical header pipe portion which is fixedly disposed at one terminal end of the serpentine tube along the depth of the serpentine tube, and a separate cylindrical conducting pipe portion of which one terminal end is connected at a right angle to the inner side section of the air outflow region of the header pipe portion.

Abstract: A heat exchanger (10) for an automotive vehicle includes a pair of manifolds (12, 14) each including a header portion (24) and a tank portion (26). The tank portion (26) includes a predetermined number of generally horizontal rib portions (30) formed therein at predetermined positions. The heat exchanger (10) further includes a plurality of tubular elements (16) disposed in spaced, substantially parallel relation and which define flow paths for the coolant between the manifolds (12, 14). At least one of the tubular elements (32) has a length greater than an adjacent tubular element (16) and extends through the header portion into mating engagement with the rib portion (30) of the tank (26) of one of the manifolds to form baffle means (36) for preventing the flow of coolant therepast.

Abstract: A heat exchanger device for refrigeration driers in compressed-air installations is described. Such heat exchanger devices have an air/air heat exchanger (1) and a refrigerant/air heat exchanger (2). According to the invention, the air/air heat exchanger is produced as a plate heat exchanger and the refrigerant/air heat exchanger is produced as a combined tube/plate heat exchanger. The tube/plate heat exchanger has at least one unit containing a tube coil being coiled in a meandering manner and forming two spaced broad sides, and two plates, each plate being fastened at one of the two broad sides (FIG. 1 ).

Abstract: The air conditioner condenser includes a set of hollow parallel tubes disposed between a pair of header pipes. The header tubes provide fluid flow between the header pipes and are substantially flat, having parallel upper and lower side walls. The walls have inner and outer surface and are separated by longitudinally extending webs defining separate flow passages. A partition or baffle is formed by removing one of the upper or lower walls from a tube having a length greater than that of the other tubes. The header pipe has a series of slots, each having similar dimensions. The tubes are inserted into the slots and sealed, with the extended portion of the extended tube forming the partition or baffle.

Abstract: A heat exchanger, for example a condenser for a motor vehicle air conditioning system, comprises a matrix of cooling fins through which extend serpentine tubes consisting of hairpin shaped tubes joined by tubular junction pieces. The fin matrix is surmounted by an end plate. The heat exchanger is joined to an inlet or outlet flow pipe by a connecting device comprising a connecting block having a connecting element for connecting it to the flow pipe. The block has a recess in which the end of one or more of the heat exchanger tubes is sealingly mated, and is secured on the end plate of the heat exchanger by fastening means.

Abstract: A three row condenser for cooling alternative refrigerants for use in automotive air conditioning systems has a continuously formed U-bend tube forming the air inlet to the condenser at a point upstream of second and third rows of like tubes each interconnected by parallel heat conducting cooling fins; the high pressure vapor inlet flow to the condenser is substantially equally distributed into the first, second and third rows and refrigerant flow in the first and second rows of tubes is combined upstream of the outlet of the condenser to provide a series connected tube pattern for increasing the flow velocity through outlet portions of the first and second rows of tubes so as to improve the efficiency of energy transfer between the refrigerant flow through the condenser and the air flow across the air fins therein.

Abstract: A joint (24) and method of making the same for interconnecting various segments of coolant tubes of heat exchangers. The instant joint (24) includes a first tube (26) having a necked end (38) with a reduced outer diameter (40) and a second tube (30) having a frustro-conical portion (34) with a steadily increasing inner diameter. The necked end (38) of the first tube (26) is inserted within the frustro-conical portion (34) of the second tube (30) thus forming a frustro-conical portion shaped increasing gap space therebetween. The increasing gap space is filled with epoxy adhesive to form a bond (44) of steadily increasing thickness between the outer diameter (28) of the first tube (26) and the steadily increasing inner diameter of the frustro-conical portion (34) of the second tube (30).

Abstract: Using a series of identically sized, single row, single circuit refrigerant coil modules, fin/tube refrigerant coils of different nominal air conditioning tonnages are constructed by arranging different numbers of the identically sized module in accordion-pleated orientations, with each modular coil having the same depth in the direction of intended air flow across the coil. Compared to conventional "A" coils used on the indoor side of air conditioning circuits, these accordion-pleated modular coils are more compact in the air flow direction, provide more coil surface area, permit lower coil face velocities with higher fin density, and significantly reduce the overall coil manufacturing costs since only one size of coil slab needs to fabricated and inventoried to later assemble refrigerant coils of widely varying nominal air conditioning tonnages.

Abstract: The core depth of a heat exchanger having parallel, tube-like headers (10, 12; 62, 64) may be reduced through the use of a plurality of second heat exchange fluid conduits (26, 126) located in side by side relation and each having a first port (30, 60, 178) in fluid communication with one of the headers (12, 62) and a second port (32, 168, 174) in fluid commuication with the other of the headers (10, 64) and each defining a serpentine fluid flow path between the ports (30, 32, 166, 168, 174, 178) having a plurality of passes (36, 38, 40, 42, 44; 140, 142, 144, 146; 184, 186, 188) in side by side relation together with fins 28 embracing and bonded to the conduits (26, 126).

Abstract: A serpentine type evaporator for use in a refrigeration circuit, which comprises a serpentine flat tube including a plurality of spaced essentially parallel planar portions and a plurality of bent portions, fins interposed between opposed outer surfaces of the serpentine flat tube, an inlet header pipe connected to one end of the serpentine flat tube, an inlet pipe connected to the inlet header pipe, an outlet header pipe connected to the other end of the serpentine flat tube, and an outlet pipe connected to the outlet header pipe. At least one of the inlet pipe and the outlet pipe are connected perpendicularly to one of said inlet header pipe or the outlet header pipe.

Abstract: A pneumatic transport system for transferring particulate material from a first pressurized container to a second container which is under a lower pressure, while successively reducing the pressure, comprising a number of parallel tubes (36), arranged in series, said tubes being joined together at their ends by means of transfer chambers (38) for transferring a gas/material stream from an upstream tube (36) to a downstream tube (36). The transfer chamber (38) are formed with tubular inlets and outlets (52, 56) opening out into a space (54) where a gas/material stream is transferred from the inlet (52) to the outlet (56). Between the inlet (52) and the outlet (56) there is a double-bent unsymmetrical surface, bulging towards the space (54), which conforms to the wall surfaces of the inlet (52) and the outlet (56).

Abstract: A curved heat exchanger for a vehicle has tubes generally sector shaped in cross section and arranged in an arcuate pattern to transmit heat exchanger fluid between laterally spaced tanks. One embodiment has discrete heat exchanger fluid sections respectively connected to a vehicle engine, torque converter transmission and between the air conditioner compressor and evaporator. The tubes are tilted to align air passages therebetween with the radial direction of air flow discharged from an interior fan so that there is improved fan-heat exchanger matching resulting in reduced separation of air from the surfaces of the heat exchanger tubes and turbulence in the air passages. The side walls of adjacent tubes are equally spaced from one another to receive standard width air centers therebetween. The tubes may have discrete inner and outer flow sections insulated from one another and respectively employed to conduct engine coolant and another heat exchanger fluid such as for the air conditioning system.

Abstract: An air cooled heat exchanger is comprised of a plurality of generally parallel fluid carrying tubes joined at the ends so as to form a refrigerant circuit which is free floating with respect to its means of support. The fluid carrying tubes are directly connected to heat transfer fins running generally perpendicular to the tubes. The fins in turn are connected to non-fluid carrying support tubes which are generally parallel to the fluid carrying tubes. The support tubes are secured at their ends to end plates and as necessary to a center plate or plates. There is no direct contact between the end plates or center plates and the fluid carrying tubes, which are free to move with respect to the end plates and center plate or plates. Therefore, damage to the fluid carrying tubes and leakage which often occurs at the connection between a fluid carrying tube and a support plate due to abrasion caused by vibration and temperature changes is eliminated.

Abstract: A condenser for vaporous materials, in which at least two pipes are assigned to one another in a series arrangement and are circumflowed by a cooling medium. A separation device is provided at the discharge port of every pipe. This separation device causes the residual vapor to separate from the condensation product. The separation devices are connected via collectors to a pair of collecting chambers from which the condensation product is withdrawn.

Abstract: Using a series of identically sized, single row, single circuit refrigerant coil modules, fin/tube refrigerant coils of different nominal air conditioning tonnages are constructed by arranging different numbers of the identically sized modules in accordion-pleated orientations, with each modular coil having the same depth in the direction of intended air flow across the coil. Compared to conventional "A" coils used on the indoor side of air conditioning circuits, these accordion-pleated modular coils are more compact in the air flow direction, provide more coil surface area, permit lower coil face velocities with higher fin density, and significantly reduce the overall coil manufacturing costs since only one size of coil slab needs to be fabricated and inventoried to later assemble refrigerant coils of widely varying nominal air conditioning tonnages.

Abstract: A refrigerant evaporator for an air conditioning and ventilating system for a motor vehicle has an evaporator with an air inlet face which receives a non-uniform air flow pattern from a radial air blower of the ventilating system and which evaporator further includes refrigerant passes with flow areas and volumes selected to contract the refrigerant flow at the outlet of the evaporator thereby to produce more refrigerant cooling in the portion of the evaporator core which receives higher air flow so as to produce a more uniform outlet air temperature from the evaporator.

Abstract: A low profile water distiller has a housing. A steam chamber is located within the housing having a horizontal dimension greater than its vertical height. A condenser is also located within the housing having a horizontal dimension greater than its vertical height. The vertical height of the condenser is generally the same as the vertical height of the steam chamber. A raw water conduit extends in a generally horizontal plane within the housing for delivering water to be distilled into the steam chamber. A steam conduit also extends within the housing for delivering steam from the steam chamber to the condenser. The steam conduit extends in a generally horizontal plane parallel to the generally horizontal plane of the raw water conduit. An air circulation channel within the housing draws cooling air through the condenser in a generally horizontal path parallel to the generally horizontal planes of the raw water conduit and the steam conduit.

Abstract: A heat exchanger includes a serpentine tube, a plurality of fins provided on the sides of the tube, and unions into which the respective end portions of the tube are inserted and to which the end portions are brazed. An expanded portion is formed on the tip of each inserted end portion of the tube, and a corresponding engaging portion is provided in each union. The expanded portion is engaged with the engaging portion of the union. Since the end portion of the tube is temporarily fixed to the union by the engagement of the expanded portion with the engaging portion, it is possible to simultaneously braze the tube to the union, and the tube to the fins, in a furnace. The manufacturing process of the heat exchanger can be simplified, the efficiency of the brazing process is increased, and the quality of the brazed portion is consistently high.

Abstract: A heat exchanger, in particular for an automotive vehicle, includes a bundle of tubes with a plurality of assemblies of first tubular elements with second tubular elements, so as to constitute a continuous circuit for circulation of fluid within the heat exchanger. One of the tubular elements has a portion which is polygonal in cross section and which is telescoped or mated with the other one of the tubular elements of the same assembly, this other tubular element being circular in cross section.

Abstract: A tubular manifold for an evaporator includes an integral baffle formed by deforming a wall section of a header tube onto an opposing wall section and crimping the two side walls inwardly at an axial point where the wall section is deformed. The internal baffle forms a U-shaped seal within the tube and is interposed between two side ports of the manifold.

Abstract: A heat exchanger is disclosed comprising a pair of laterally spaced fluid conducting tanks operatively interconnected by a plurality of elongated fluid conducting tubes having sector shaped cross sections and arcuately spaced from one another in a circular pattern to present parallel interfacing sides. A plurality of elongated corrugated fins or air centers each having convolutions of substantially constant height and width to have spaced lines of contact along the width and length of each of the sides of the tubes for maximizing heat transfer and so that the tubes will be optimally supported to provide increased resistance to pressure ballooning and burst. These air centers are standard corrugated rectilinear components that reduce complexity and cost of this circular heat exchanger. This heat exchanger can be arranged in a parallel relationship with a transverse automotive engine and a cooling fan operatively mounted within the heat exchanger can be directly driven by the engine.

Abstract: A liquefier for the coolant in a vehicle air-conditioning system equipped with finned heat exchange tubes through which the coolant is conducted in cross-current to the inflowing ambient air. The heat exchange tubes are arranged in several rows of tubes disposed one behind the other in the direction of flow of the incoming ambient air with the respective heat exchange tubes being connected in cross-countercurrent flow. The rows of tubes are subdivided into several component groups (14, 16) which are arranged one behind the other in the direction of flow of the incoming ambient air, with their fin arrangements being decoupled with respect to thermal conduction. The component groups (14, 16) are connected in series with respect to the coolant and in countercurrent to the direction of flow of the incoming ambient air.

Abstract: In a heat exchanger having a plurality of fins mounted on an outer surface of a tube which is for conducting a fluid therethrough, the fins are different in fin thickness to make a first and a second fin set portion. Each of the fins of the first fin set portion has a comparatively small thickness. Each of the fins of the second fin set portion has a comparatively large thickness. The heat exchanger is placed in another fluid so that a comparatively high flow energy portion of the other fluid flows into the first fin set portion while another comparatively low flow energy portion of the other fluid flows into the second fin set portion.

Abstract: A multiple serpentine tube heat exchanger having side-by-side arranged serpentine-shaped passageways each extending across the core and a mixing chamber connecting one such passageway to at least one other. The passageway constituting the back of the heat exchanger core has an enlarged internal surface area relative to the passageway constituting the face of the heat exchanger core. Microgrooving of the passageway can be used to further enhance heat transfer.

Abstract: A condenser apparatus includes a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; and fins provided in the air paths between one tube and the next. Each of the headers is made of a cylindrical pipe of aluminum. At least one of the headers is internally divided by a partition into at least two groups of coolant passageways, thus enabling the flow of coolant to make at least one U-turn in the header. The partition extends into the header through a slit in the header. Each of the tubular elements is made of a flat hollow tube of aluminum. The opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly secured.

Abstract: An air cooled heat exchanger is comprised of a plurality of generally parallel fluid carrying tubes joined at the ends so as to form a refrigerant circuit which is free floating with respect to its means of support. The fluid carrying tubes are directly connected to heat transfer fins running generally perpendicular to the tubes. The fins in turn are connected to non-fluid carrying support tubes which are generally parallel to the fluid carrying tubes. The support tubes are secured at their ends to end plates and as necessary to a center plate or plates. There is no direct contact between the end plates or center plates and the fluid carrying tubes, which are free to move with respect to the end plates and center plate or plates. Therefore, damage to the fluid carrying tubes and leakage which often occurs at the connection between a fluid carrying tube and a support plate due to abrasion caused by vibration and temperature changes is eliminated.

Abstract: A heat exchanger assembly comprises a pair of header members and a plurality of heat transfer tubes passing between the headers members. The heat transfer tubes are adapted to transfer heat between fins on the exterior of the tubes and a working fluid in liquid or gaseous phase within the tubes. A pressure drop minimizing tube passes between the headers and has a cross sectional area significantly larger than the heat transfer tubes. The pressure drop minimizing tube is adapted to carry the working fluid in a gaseous phase either as an inlet, when the heat transfer assembly is utilized as a condenser, or as an outlet, when the heat transfer assembly is utilized as an evaporator. A member connects the pressure drop minimizing tube at one end to at least two of the heat transfer tubes for condensation to a liquid, when the assembly is utilized as a condenser, or transferring gaseous working fluid from the heat transfer tubes to the pressure drop minimizing tubes, when the assembly is utilized as an evaporator.

Abstract: A highly efficient heat exchanger susceptible of a variety of uses is provided by a construction including first and second spaced, parallel headers 10, 12, 114 and 140 and a plurality of substantially identical serpentine conduits 18, 104 having at least three generally parallel runs 24, 105 and terminating in opposed ends 20, 22, 106, 108; 130, 132. The conduits 18, 104 are in generally spaced, side-by-side relation. One end 104 of each conduit 18, 104 extends to and is in fluid communication with the first header 10, 114, 140 and the other end of each conduit 18, 104 extends to and is in fluid communication with the second header 12. A plurality of serpentine fin sheets 30, 120 are located so as to extend between an associated pair of the conduits 18 in thermally conducive relation therewith.

Abstract: A heat exchanger has a tubular inlet header and a tubular outlet header, each formed in its peripheral wall with a slot extending axially thereof, and a zigzag tube comprising a plurality of straight tube portions arranged in parallel to one another and bent portions each interconnecting the immediately adjacent straight tube portions at their upper or lower ends. The tube portions at opposite ends of the flat tube are joined to the respective headers with the unconnected end of each tube portion inserted in the slot. An extension of the center line of the flat tube portion inserted in the outlet header does not intersect the center line of the outlet header.

Abstract: A fitting for a two flat tube serpentine heat exchanger having high burst pressure comprises a header plate with two slots for receiving the flat tubing and a cover plate with a port, a nipple protruding from the port, and a recess surrounding the port and extending over the slots to provide communication between the port and the slots. The plates are formed by extrusion with the appropriate apertures, cut to the desired thickness and the recess is milled out, or the plates and apertures are stamped from sheet stock. The plates are welded together at their common periphery or brazed together at their margins outboard of the recess.

Abstract: A condenser adapted for use in the car cooling system, the condenser comprising a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; fins provided in the air paths between one tube and the next; wherein each of the headers is made of a cylindrical pipe of aluminum; wherein each of the tubular elements is made of a flat hollow tube of aluminum by extrusion; and wherein the opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly soldered therein.

Abstract: A tube and center heat exchanger has header and tank assemblies formed of just two plates stacked and bonded together. One plate has apertures for receiving the tube ends, and the second plate is formed with a plurality of tank defining indentations in an interface thereof that interconnect selected ones of the tube ends to thereby connect all the tubes to define a serpentine flow path through the heat exchanger. The header and tank plates are stamped from flat sheet stock of braze clad aluminum, the necessary perforations, clinch tabs and indentations are formed and the plates are stacked and clinched into header and tank assemblies. The tube and center elements are assembled and the tube ends are inserted into the header and tank assemblies. The whole heat exchanger is then brazed to form the bonding between the plates as well as the other elements.

Abstract: A refrigeration condenser has at least two serpentine paths of unequal lengths (effected by unequal numbers of loops in the paths) extending between common inlet and outlet ports. By adding this design capability to the conventional equal path length condensers greater design flexibility is provided to permit smaller incremental size changes from conventional equal path length condensers, and allows inlet and outlet ports to be on the same side or on opposite sides without any change in condenser size or performance.

Abstract: A pipe element for a heat exchanger which comprises at least one bent portion and at least two linear portions connected to the bent portion wherein an angle formed by the adjacent two linear portion is in a range of from about 30' to 3.degree..

Abstract: The plumbing module is a self-contained fully operational unit which provides the capabililty of supplying both hot or room temperature and refrigerated water or other beverages. The module may be adapted without significant modification to a wide range of products and uses, including bottled water coolers, drinking fountains and beverage dispensers. A dual parallel condenser coil in the refrigeration system takes approximately one-half the space of conventional coils and provides adequate heat dissipation without requiring forced air cooling fans.

Abstract: A condenser for an air conditioning system has a tube and fin design. The tubular flow path divides into two parallel paths at the condenser inlet. The two paths combine at a junction at a point about two thirds of the distance to the outlet. A single path connects the junction to the outlet. In general condensation of the refrigerant occurs in the dual path and liquid flows at high velocity in the single path to the outlet for better heat transfer and reduced liquid volume in the tubular path.

Abstract: A heat transfer unit includes an elongated finned tubular element bent in a serpentine pattern with the thickness of the wall of the tubular member made greater at return bend portions than at cross portions either by more shallow cutting of the rib material from which the fins are formed at the return bend portions than at the cross portions, or by crimping the tubular member at the return bend portions prior to cutting the fins so that a portion of the rib material from which the fins are cut is compressed inwardly on both sides of the tubular member to increase the wall thickness of tube material at the return bend portions.

Abstract: A heat exchanger assembly of the side-entry cross-fin type includes first and second integral fin units, each comprising a single sheet of material provided with a plurality of aligned apertures, the sheet of material being folded in accordian-fashion such that the apertures define a plurality of notches arranged in rows which extend longitudinally of the fin unit. Two of the fin units are assembled together with a single length of heat exchange tube which threads the notches of the fin units, the tube extending over an oval-shaped helical path through the two fin units. In another embodiment, a single folded fin unit is provided with notches in fins on its upper and lower surface, a single length of tube being wrapped around the single fin unit threading the apertures therein, the tube extending in a generally oval-shaped helix path.

Abstract: A heat exchanger, particularly a coolant evaporator, is provided that has several flat pipes that are arranged parallel to one another and are each expanded at their ends with respect to a central part and are closed off by caps. The expanded ends are provided with connecting openings so that the heat exchange medium can flow to the adjacent pipe. At least one of the caps that are provided for closing off the pipe ends is equipped with a projection extending towards the inside of the pipe and closes off at least one of the connecting openings, so that the production of a heat exchanger of identically constructed flat pipes is simplified, in that by the insertion of correponding caps that either expose the connecting openings to the adjacent pipes or not, it is easy to control the flow of the heat exchange medium inside the flat pipes.

Abstract: A heat exchanger is described that is constructed of several flat tubes arranged in parallel and at a distance to one another which, at their two front sides, are each closed off tightly. The end areas of the tubes are provided with connecting openings extending transversely to their longitudinal axis and leading to the adjacent flat tube or to the adjacent group of tubes. An advantage of the invention is its ease of manufacture.