Abstract: A cryogenic medical device for delivery of subcooled liquid cryogen to various configurations of cryoprobes is designed for the treatment of damaged, diseased, cancerous or other unwanted tissues. The device is a closed or semi-closed system in which the liquid cryogen is contained in both the supply and return stages. The device is capable of generating cryogen to a supercritical state and may be utilized in any rapid cooling systems. As designed, the device comprises a number of parts including a vacuum insulated outer dewar, submersible cryogen pump, baffled linear heat exchanger, multiple pressurization cartridges, a return chamber, and a series of valves to control the flow of the liquid cryogen. The cryogenic medical device promotes the subcooling to any external cryogenic instrument.

Abstract: An arrangement for cooling power semiconductor devices (2) of a converter (1) arranged in a closed casing (3) with the semiconductor devices in a bottom of the casing on top of a heat sink (5) having members (6) for heat exchange extending externally of the casing out from the bottom comprises a channel (8) for conducting a flow of air to pass said members (6) for cooling thereof, in which a first portion (7) of the channel has the casing bottom as a ceiling and receiving said members (6). A fan (9) is located with a suction side connected to the first channel portion (7) to create a flow of air from an inlet (16) from the exterior (19) into the channel while passing the heat sink members. A filter (18) covers the inlet to the channel for removal of dust and debris from air entering the channel from the exterior.

Abstract: A vapor chamber in which an enclosed space is formed, and a working fluid is sealed in this space, the enclosed space including: a plurality of condensate flow paths through which a fluid that is the working fluid in a condensing state flows; and vapor flow paths through which a vapor that is the working fluid in a vaporizing state flows, wherein each of projecting parts with which each of the vapor flow paths is provided has a projecting amount varying in an extending direction of the vapor flow paths; a pitch for opening parts that allow the vapor flow paths and the condensate flow paths to communicate varies in the extending direction of the vapor flow paths; or wall parts that separate the flow paths each have a given relationship with a transverse cross section of a given flow path.

Abstract: A heat exchanger includes a distributor, and a first heat transfer tube and a second heat transfer tube connected in parallel with each other with respect to the distributor. The first heat transfer tube is disposed above the second heat transfer tube. The first heat transfer tube has a first inner circumferential surface, and at least one first groove recessed relative to the first inner circumferential surface and arranged side by side in a circumferential direction of the heat transfer tube. The second heat transfer tube has a second inner circumferential surface, and at least one second groove recessed relative to the second inner circumferential surface and arranged side by side in a circumferential direction. An internal pressure loss of the first heat transfer tube is smaller than an internal pressure loss of the second heat transfer tube.

Abstract: An apparatus for fabricating a hybrid tube includes a rotatable mandrel and a first housing configured to translate alongside the rotatable mandrel while dispensing a first strip to be helically wound about the mandrel. The first housing includes an angle adjustment mechanism to control a dispensation angle of the first strip. The apparatus also includes least one energy or adhesive source for bonding overlapping strip portions on the rotatable mandrel and forming the hybrid tube. The at least one energy or adhesive source is configured for translation alongside the rotatable mandrel.

Abstract: A heat exchanger includes: a surface with a water-repellent coating. The surface has a surface structure that includes protrusions. Condensed water droplets, each having a droplet diameter that allows a subcooled state to be maintained even under a predetermined freezing condition, combine with one other on the surface and generate an energy. The surface structure uses the energy to remove the combined condensed water droplets from the surface.

Abstract: Heat exchangers include at least one looped tube having at least one section that is laterally offset from another section of the looped tube. Fluid cooling systems and seal systems may include such heat exchangers.

Abstract: Disclosed fluid flow modifying devices are useful with flexible fluid flow conduits. Such devices are adapted for mitigating adverse flow considerations arising from one or more bends in flexible fluid flow conduits. These adverse flow considerations are generally characterized as enhanced laminar flow and associated increased backpressure arising from reduced flow velocity caused by the one or more bends. Beneficially, disclosed fluid flow modifying devices cause flow of flowable material (e.g., a liquid) within a flow passage of a fluid flow conduit to have a rotational flow profile. Such a rotational flow profile advantageously reduces frictional losses associated with laminar flow and with directional change of fluid flow.

Abstract: A turbocharger system includes a compressor, an intercooler, and a hot-charge duct connecting an outlet of the compressor to an inlet of the intercooler. The hot-charge duct has a first end portion connected to the inlet, a second end portion connected to the outlet, and a central tubular portion extending from the first end portion to the second end portion. The central tubular portion is formed of a plurality of circumferentially interconnected semi-tubular sections that extend longitudinally.

Abstract: Disclosed fluid flow modifying devices are useful with flexible fluid flow conduits. Such devices are adapted for mitigating adverse flow considerations arising from one or more bends in flexible fluid flow conduits. These adverse flow considerations are generally characterized as enhanced laminar flow and associated increased backpressure arising from reduced flow velocity caused by the one or more bends. Beneficially, disclosed fluid flow modifying devices cause flow of flowable material (e.g., a liquid) within a flow passage of a fluid flow conduit to have a rotational flow profile. Such a rotational flow profile advantageously reduces frictional losses associated with laminar flow and with directional change of fluid flow.

Abstract: A method for forming features in an exterior surface of a heat transfer tube includes forming a plurality of channels into the surface, where the channels are substantially parallel to one another and extend at a first angle to a longitudinal axis to the tube. A plurality of cuts are then made into the surface substantially parallel to one another and extend at a second angle to a longitudinal axis to the tube different from the first angle. Individual fin segments extend from the surface and are separated from one another by the channels and the cuts. The fin segments have a first channel-adjacent edge adjacent substantially parallel to the channel, a first cut-adjacent edge substantially parallel to the cut, and a corner formed by a second channel-adjacent edge and a second cut-adjacent edge. A tube formed using this method can be used as a condenser tube.

Abstract: A heat exchanger tube with a tube axis, a tube wall and with ribs extending around on the tube outer side. The ribs have a rib foot, rib flanks and a rib tip, wherein the rib foot projects substantially radially from the tube wall. The rib flanks are provided with additional structural elements which are arranged laterally on the rib flank. First material projections, which extend substantially in the axial and radial direction, adjoin second material projections which extend substantially in the axial and circumferential direction of the tube, wherein the first and second material projections have a common boundary line. The axial extent of the first material projections along this boundary line is less than the axial extent of the second material projections.

Abstract: A transport refrigeration unit (TRU) includes a compressor. The TRU further includes a condenser disposed downstream of the compressor. The TRU further includes an expansion device disposed downstream of the condenser. The TRU further includes a first flow control device disposed downstream of the condenser. The TRU further includes a first evaporator disposed downstream of the expansion device and the first flow control device. The first evaporator is disposed upstream of a second flow control device. The second evaporator is disposed downstream of the first flow control device, the expansion device, and the second flow control device. The second evaporator includes a thermal accumulator. The second flow control device disposed upstream of the compressor.

Abstract: The mixed louver spiral fin is a development of the conventional spiral fin-and-tube heat exchanger having louvers at the surface of the fin. Louvers are made on the fin surface for enhancing heat transfer performance. The louvers made are perpendicular and parallel with the radius of the fin. The mixed louver spiral fin can be used for building heat exchangers with heat exchange between fluids, such as gas, liquid, or gas-liquid two phases or application in heat exchangers for waste heat recovery.

Abstract: An exterior surface of a heat transfer tube has a plurality of channels formed into the surface, where the channels are substantially parallel to one another and extend at a first angle to a longitudinal axis to the tube. A plurality of cuts are then made into the surface substantially parallel to one another and extend at a second angle to a longitudinal axis to the tube different from the first angle. Individual fin segments extend from the surface and are separated from one another by the channels and the cuts. The fin segments have a first channel-adjacent edge adjacent substantially parallel to the channel, a first cut-adjacent edge substantially parallel to the cut, and a corner formed by a second channel-adjacent edge and a second cut-adjacent edge. The tube can be used as a condenser tube.

Abstract: Battery parts, such as battery terminals, and associated systems and methods for making the same are disclosed herein. In one embodiment, a battery part has a base portion that includes one or more undercut sealing portions, each having a root and a lip. The lip can flare outwardly from the root to define an undercut between the root and the lip of the sealing portion. In some embodiments, the battery terminal can include adjacent sealing portions having opposing undercuts defined by overlapping lips of the adjacent sealing portions. Another embodiment includes a forming assembly for use with, for example, a battery part having a bifurcated acid ring with spaced apart lips. The forming assembly can include movable forming members that can be driven together to peen, crimp, flare or otherwise form the lips on the bifurcated acid ring.

Abstract: A heat exchanger tube with a tube axis, a tube wall and with ribs extending around on the tube outer side. The ribs have a rib foot, rib flanks and a rib tip, wherein the rib foot projects substantially radially from the tube wall. The rib flanks are provided with additional structural elements which are arranged laterally on the rib flank. First material projections, which extend substantially in the axial and radial direction, adjoin second material projections which extend substantially in the axial and circumferential direction of the tube, wherein the first and second material projections have a common boundary line. The axial extent of the first material projections along this boundary line is less than the axial extent of the second material projections.

Abstract: A spiral louver shaped condenser includes fins and a refrigeration pipe. The fins are spirally wound about the refrigeration pipe and integrally formed by stamping a strip-shaped sheet material, at least including first heat-absorbing and heat-radiating bodies and second heat-absorbing and heat-radiating bodies. Broken lines are arranged between adjacent heat-absorbing and heat-radiating bodies, and each heat-absorbing and heat-radiating body forms a wavy structure. Relative wave crests and wave troughs are formed at each broken line between the adjacent heat-absorbing and heat-radiating bodies, wherein the crests and troughs form a honeycomb structure together. The wavy edges of the first heat-absorbing and heat-radiating bodies make contact with the outer wall of the refrigeration pipe at equal screw pitches.

Abstract: A heat exchanger can include a stacked array of interconnected fluid transfer members. The stacked array of interconnected fluid transfer members can include a first fluid transfer member, a second fluid transfer member, a third fluid transfer member, and a fourth fluid transfer member. The first fluid transfer member can include a liquid passageway extending lengthwise though the first fluid transfer member and a set of helical fins extending outwardly from an outer surface of the first fluid transfer member and rotating along a length of the first fluid transfer member. The stacked array of interconnected fluid transfer members can form a jointless structure.

Abstract: A helical coil is supported inside a heat exchanger tube by at least one inside protrusion on the inside wall of the tube, the at least one protrusion supports the helical coil on a contact point of the helical coil against downwards movement in the tube and supports the helical coil on the end point of the helical coil against rotational movement in a first rotational direction relative to the tube.

Abstract: The present invention relates to an implement, in particular an excavator or a machine for material handling, with an element movable via at least one working drive, wherein at least one energy recovery cylinder is provided for energy recovery from the movement of the movable element, which includes a chamber filled with gas. The energy recovery cylinder is equipped with a heat exchanger.

Abstract: Embodiments are disclosed that relate to a compact steam boiler which may provide steam to a steam reformer in a fuel cell system. For example, one disclosed embodiment provides a steam boiler including an outer shell and a first inner tube and a second inner tube within the outer shell, the first and second inner tubes spaced away from one another. The steam boiler further includes a twisted ribbon positioned inside each of the first and second inner tubes.

Abstract: A heat exchanger, illustratively utilized in a fuel-fired pool heater, circumscribes a burner operative to discharge hot combustion gases outwardly through the heat exchanger. The heat exchanger has a tube portion helically coiled about an axis, with a series of heat transfer fins circumscribing the tube portion and spaced apart along it length. The fins on longitudinally adjacent pairs of coils of the tubing have nested facing edge portions which collectively form a seal area that coils between the tubing portion adjacent coil pairs in axially spaced relationships therewith, the seal area substantially impeding combustion gas flow therethrough in a direction generally transverse to the axis of the heat exchanger. Additionally, the fins have deformed laterally outer portions that define a coiled, circumferentially spaced series of restricted combustion gas outlets in substantial axial alignment with the helically coiled tube portion.

Abstract: A finned tube includes channels defined between adjacent fins on the tube body outer surface. Wings extend from side walls of the adjacent fins between the fin top and the fin base such that the wings form a barrier which splits the channel into an upper channel and a lower channel. A plurality of holes penetrate the barrier where the wings meet, so liquids and gases can pass into and out of the enclosed area defined by the lower channel. The wings can include alternating upper wings and lower wings, and there can be depressions formed in the fin top.

Abstract: A method of operating an evaporator is described. In evaporator feed water, a Taylor bubble is developed which has an outer surface including a thin film in contact with an inner surface of an outer wall of an evaporator tube. The Taylor bubble is heated as it rises within the evaporator tube so that liquid in the thin film transitions into vapor within the bubble.

Abstract: A heat-exchange apparatus and a mounting component set for installation into storage tanks. The heat-exchange apparatus comprises a heat-exchanging component, a coupling manifold configured to engage with the heat-exchanging component, and a hollow, elongate, flow-directing element that delivers fluid to the heat-exchanging component. The mounting component set comprises an inner flange for engaging the inner wall of the storage tank, an outer flange for engaging the outer wall of the storage tank, and at least one gasket cooperable with one of the flanges. The heat-exchange apparatus sealably engages the outer flange such that the heat-exchanging component extends into the interior of the tank, and the coupling manifold is interconnectable to an external supply of heat-exchange fluid.

Abstract: A heat exchanger tube with a tube axis and with a tube wall having a tube outside and a tube inside, axially parallel or helically encircling inner ribs, with a groove which lies in each case between adjacent inner ribs, being formed from the tube wall on the tube inside, the helix angle, measured with respect to the tube axis, of the inner ribs being smaller than or equal to 45°, the region of the inner ribs which is remote from the tube wall being deformed at regular intervals asymmetrically on one side essentially in the tube circumferential direction, the deformed material of the inner ribs forming protrusions above the groove, the protrusions extending in each case over a finite deformation zone along an inner rib, the markedness of the deformation changing continuously within the deformation zone.

Abstract: Multi-scale turbulation features, including first turbulators (46, 48) on a cooling surface (44), and smaller turbulators (52, 54, 58, 62) on the first turbulators. The first turbulators may be formed between larger turbulators (50). The first turbulators may be alternating ridges (46) and valleys (48). The smaller turbulators may be concave surface features such as dimples (62) and grooves (54), and/or convex surface features such as bumps (58) and smaller ridges (52). An embodiment with convex turbulators (52, 58) in the valleys (48) and concave turbulators (54, 62) on the ridges (46) increases the cooling surface area, reduces boundary layer separation, avoids coolant shadowing and stagnation, and reduces component mass.

Abstract: The invention relates to a heat exchanger tube with at least one structured region on the inside of the tube, which has the following features: a) integral internal ribs of height H run on the inside of the tube in axially parallel or helical-line-shaped manner continuously over the circumference at an angle of inclination ?1, measured with respect to the tube axis, with primary grooves being formed, b) the internal ribs are crossed over the entire circumference of the tube by spaced-apart secondary grooves which, parallel to one another at an angle of inclination ?2, measured with respect to the tube axis, have a notch depth T2 and a groove opening angle ?2, c) the internal ribs and the secondary grooves are crossed over the entire circumference of the tube by spaced-apart tertiary grooves which run continuously over the circumference parallel to one another at an angle of inclination ?3, measured with respect to the tube axis, and have a notch depth T3 and a groove opening angle ?3.

Abstract: A method and system device for controlled deformation of spine fin coil. A spine fin tubing is placed and guided through a conduit constructed with comb-like teeth so that the spine fins are deformed by the comb-like teeth in a controlled manner. The controlled deformation can be performed either before or during winding with a winder and/or after a coil is made.

Abstract: Apparatus and methodology for self-generating high-temperature water and superheated steam for recovering embedded heavy-viscosity hydrocarbons from subterranean rock, shale, bitumen, sand formations and enabling continuous flow of released heavy-viscosity hydrocarbons using four successive spiral trough-like flowpaths, and optionally comprising an internal elongated pump member. Another embodiment promotes continuous flow of heavy-viscosity hydrocarbons through surface pipelines to tanks, railway tankcars, ships, refineries. A plurality of high-temperature, sheathed insertion heaters sustains constant high temperature to assure continuous flow of such hydrocarbons.

Abstract: A heat sink which is mounted in a movable body and which is to be exposed to a traveling air stream generated while the movable body moves includes a base and a heat dissipating portion having a plurality of fins. At least in a front end portion of the heat dissipating portion, the heat dissipating portion includes a rectifying portion provided so as to extend across a predetermined area in a longitudinal direction in front portions of slit-shaped flow paths at an upstanding end (i.e., an end apart from the base).

Abstract: This invention provides an enhanced condensation heat-transfer tube, which is furnished with spiral fins on the outer surface. Axial spacing between the said fins regularly changes in width. In a preferred embodiment, the said fins regularly change in height along the axle. Such spiral fins with even changes in height and spacing change the surface tension of the condensate membrane between the fins outside of the tube, so as to enhance the “Gregorig” effect (average heat resistance reduces due to uneven thickness of condensate membranes). In this way, it further strengthens condensation heat transfer effects outside of the tube. At the same time, it accelerates flowing of the condensate to the bottom, enhances heat transfer effect, and improves the tube bundle effect.

Abstract: Apparatus for treating a gaseous hydrocarbon fraction to obtain a gaseous fraction and a liquid fraction which apparatus includes a shell-and-tube heat exchanger and a distillation column, wherein the shell-and-tube heat exchanger includes an inlet and an outlet for cooling fluid which inlet and outlet are in fluid communication with the tube side of the heat exchanger, and an inlet for the gaseous hydrocarbon fraction at the upper end of the heat exchanger which inlet is in fluid communication with the shell side of the heat exchanger, and a conduit for guiding hydrocarbons from the heat exchanger to the distillation column which distillation column includes an outlet for gas at its upper end and an outlet for liquid at its lower end, and process in which such apparatus is used.

Abstract: The present disclosure relates to a heat transfer tube and a racking furnace using the heat transfer tube. The heat transfer tube comprises a twisted baffle arranged in an inner wall of the tube, said twisted baffle extending spirally along an axial direction of the heat transfer tube. The twisted baffle defines a closed circle viewed from an end of the heat transfer tube. Along the trajectory of the circle a casing is arranged, which is fixedly connected to a radial inner end of the twisted baffle. The twisted baffle is provided with a plurality of holes. The heat transfer tube according to the present disclosure has a good heat transfer effect and small pressure loss.

Abstract: A heat exchanger having a helix coil incorporated into a stainless steel elongated variable diameter cylindrical housing and a radial direct-firing burner and a blower-driven hot flue gas to heat water. A buffer tank is incorporated within the lumen of the helix coil. At least one rope seal is disposed between adjacent coil loops of a portion of the helix coil for enhancing heat transfer to the helix coil. In one embodiment, the heat exchanger further comprises a Stirling engine comprised of a free piston having hot and cold ends that is disposed within the cavity taken up the buffer tank, wherein the hot end receives heat from the burner and the cold end is cooled by the incoming cold water line to form an electric power generator.

Abstract: A heat exchanger having a helix coil incorporated into a stainless steel elongated variable diameter cylindrical housing and a radial direct-firing burner and a blower-driven hot flue gas to heat water. A buffer tank is incorporated within the lumen of the helix coil. At least one rope seal is disposed between adjacent coil loops of a portion of the helix coil for enhancing heat transfer to the helix coil. In one embodiment, the heat exchanger further comprises a Stirling engine comprised of a free piston having hot and cold ends that is disposed within the cavity taken up the buffer tank, wherein the hot end receives heat from the burner and the cold end is cooled by the incoming cold water line to form an electric power generator.

Abstract: Improvements in tubes, which increase the heat exchange capacity of tubular heat exchangers using the tubes, are described. These improvements involve the use of one or more external surface enhancements, optionally combined with an internal enhancement and/or differing tube geometries. These improvements apply, for example, to internal condensers, including those in which the tube bundles are oriented vertically, in vapor-liquid contacting apparatuses such as distillation columns.

Abstract: A spiral heat exchanger for producing heating and/or sanitary use hot water, specifically designed for condensation applications, characterized in that said spiral heat exchanger comprises a duct, preferably though not exclusively made of a thermally conductive material and having a contoured cross-section, called outer duct, inside which can be either arranged or not a second duct, preferably though not exclusive made of a thermally conductive material, called inner duct; the geometrical construction of said outer duct being defined as a resultant obtained by joining two different diameter circumferences, said circumferences being spaced from one another by a constant or variable radius junction pattern; the thus obtained single or double duct being coiled or spiral wound on a diameter substantially larger than the size of said duct thereby providing a hollow cylinder.

Abstract: A metallic heat exchanger tube (1) with a tube wall (2) and with integrally formed ribs (3) which run around on the tube outside (21) and which have a rib foot (31), rib flanks (32) and a rib tip (33), the rib foot (31) projecting essentially radially from the tube wall (2), and the rib flanks (32) being provided with additional structural elements which are formed as material projections (4) arranged laterally on the rib flank (32), the material projections (4) having a plurality of boundary faces (41, 42), at least one of the boundary faces (42) of at least one material projection (4) being curved convexly.

Abstract: To increase a heat exchange capacity of an indoor heat exchanger without increasing a pressure loss inside tubes of an outdoor heat exchanger. A heat exchanger is constituted by an indoor machine equipped with an indoor heat exchanger 10 constituted by a plurality of heat transfer tubes 12A, which have a spiral grooves 13A formed with a predetermined lead angle Ra on inner faces of the tubes and are made to pierce a plurality of fins 11, and an outdoor machine equipped with an outdoor heat exchanger 20 constituted by a plurality of heat transfer tubes 22A which have a lead angle Rb of spiral grooves 23A smaller than that of a heat transfer tubes 10A used for the indoor heat exchanger 10 and are made to pierce a plurality of fins 11.

Abstract: The present disclosure relates to an energy supplying device intended to be used for energy collecting, energy transfer and energy release, but also for cooling and storing of energy, said energy supplying device (1) consists of at least three elongated profiles (3), which comprise a number of walls (2?, 2?) delimiting in the same elongated cavities (2), produced by extruding in a direction of extrusion (4) by aid of a tool, said cavities (2) provide space for a medium (5) such as gas or liquid to circulate or to be stored in said cavities (2) or a hose or a tube (9) located in these.

Abstract: A paint drying booth includes a plurality of walls, a ceiling, and an access door for egress and ingress. A turbine generates heated compressed air which is delivered to the interior of the booth via a duct system. The duct is in fluid communication with an air knife having a slit which delivers a stream or sheet of air into the interior of the booth. More than one air knife can be provided, and the orientation of the plurality of air knives are coordinated to provide a flow of heated turbulent air within the booth to accelerate the drying of painted items within the booth. The turbine comprises a multi-stage compressor including a plurality of rotors and stators for compressing air passing therethrough. Optionally a pneumatic spray gun can be provided for painting the items within the booth as well.

Abstract: A method of salvaging a scrap partially completed spine fin coil by initially placing the partially completed coil on a reel. Connecting an end of a straight tube that is helically wrapped with a spine fin strip to an end of the partially completed coil while said partially completed coil is on the reel, rotate the reel after completing the connection until the partially completed spine fin coil is complete.

Abstract: A total evaporator for fluids, including a cold chamber to prevent pre-evaporation, an evaporation region connected thereto having narrow flow cross-section for fast evaporation of the fluid, and a subsequent vapor chamber for pulsation damping and the controlled superheating of the vapor, the evaporation region being formed by a gap between concentrically nested cylindrical and/or conical tube sections and heat required for the evaporation and superheating processes is supplied by electric heating and/or by hot fluid and/or by catalytic or homogeneous combustion via the wall of the concentric tubes.

Abstract: Tube heat exchanger comprising finned tubes, wherein the tubes extend in a certain axial direction and are provided with heat exchange fins. Each fin has a heat exchange surface surrounding a tube that extends in a certain radial direction in relation to the tube and which is relief structured to form grooves spaced apart from one another in said radial direction. The grooves of a fin have different dimensions that decrease on moving away from the tube in said radial direction so as to form a guide for a fluid around the tube.

Abstract: A heat sink for an LED downlight utilizes tilted fins forming helical air passages that can enhance thermal performance by 30% over conventional fins. To overcome the thermal challenge of installation within the stagnant hot air of insulated ceiling cans, a heat sink has an integral electrostatic air pump on its exterior, to move hot air downwards and drain the stagnant air from the can by establishing a chimney-like circulation up through the heat sink and back down around the outside of the heat sink. The air mover can be powered by a compact high-voltage, low-current power supply similar to those of neon signs. An embodiment of the heat sink is also revealed that is suitable for cooling an LED replacement for standard screw-in or equivalent light bulbs. This device can perform well in variety of orientations (horizontal, vertical, etc.) and fixtures.

Abstract: A water tube WT of a heat exchanger B includes a helical tube body 5 which includes a plurality of loops 50 arranged in the axial direction. At least one of the loops 50 includes an inclined tube portion which is inclined with respect to the axial direction and a non-inclined tube portion extending perpendicularly to the axial direction. The inclined tube portion is provided at each of opposite end regions s2a and s2b in a width direction crossing the axial direction, whereas the non-inclined tube portion is provided at an intermediate region S1 in the width direction. With this structure, the pitch p2 of the loops 50 is reduced. Therefore, by increasing the number of loops 50, high heat exchange efficiency is achieved without considerably increasing the size of the helical tube body 5.

Abstract: Provided are a tube type heat exchanger and a method of the tube type heat exchanger capable of preventing spiral fins 12 from being deformed. In the tube type heat exchanger and the manufacturing method of the same according to the present invention, the plural spiral fins 12 are disposed in series in the axial direction so as to have edges of the spiral fins 12, 12 spaced apart from each other, and each holder 3 is disposed between the spiral fins 12, 12 and abuts to the outer circumference of the tube body 11.

Abstract: A shell and tube heat exchanger is disclosed that is comprised of a dense hexagonal bundle of tubes with tube spacing maintained by spacers on the individual tubes. Exchanger performance is enhanced by any or all of three types of bends of the tubes: bundle twisting; bundle enlargement at the tubesheets; and shell bending. Referring to FIG. 7, the spacing enlargement bending is illustrated.