US3330336A - Heat exchanger tubes with longitudinal ribs - Google Patents

Heat exchanger tubes with longitudinal ribs Download PDF

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US3330336A
US3330336A US442033A US44203365A US3330336A US 3330336 A US3330336 A US 3330336A US 442033 A US442033 A US 442033A US 44203365 A US44203365 A US 44203365A US 3330336 A US3330336 A US 3330336A
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tubes
ribs
tube
rib
heat exchanger
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Gobel Gerhard
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/38—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and being staggered to form tortuous fluid passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0041—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having parts touching each other or tubes assembled in panel form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/12—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically the surrounding tube being closed at one end, e.g. return type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/124—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and being formed of pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F28F1/22—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/355—Heat exchange having separate flow passage for two distinct fluids
    • Y10S165/40—Shell enclosed conduit assembly
    • Y10S165/401—Shell enclosed conduit assembly including tube support or shell-side flow director
    • Y10S165/405—Extending in a longitudinal direction

Definitions

  • the invention relates to heat exchangers composed of tubes or pipes, which are provided with flat needles or short ribs pointing in the longitudinal direction of the tubes. The media flow outside the tubes and essentially in their direction. These tubular heat exchangers are employed particularly in chemical process devices and refineries, especially as preheaters for viscous oils, but also are used in other fields of endeavor. It should be pointed out that not only viscous liquids but liquids of normal flow and gases also can be used in the heat exchangers according to the invention.
  • Heat exchangers using nests or bundles of tubes of various construction are known. These usually are provided With bafiles in order to increase the flow velocities and the heat exchange. At moderate heat exchange values, the pressure loss and the expenditures of weight, volume and cost are comparatively high.
  • ribbed tube heat exchangers have tubes which are arranged in triangular or quadrangular disposition, whereby the tubes, in quadrangular arrangement, are provided with four, and in triangular arrangement with 6, single or multiple rows of short needles or ribs in the direction of the flow, and whereby all needles or ribs, respectively, of the neighboring tubes form rib stars whose centers are situated essentially within the center of gravity of the triangles and squares, respectively, the majority of the ribs pointing to the center of the star.
  • the flat needles or short ribs are at an angle of incidence relative to the tube axis, so that a pitch is effected in the flow of the outer medium about the center of the star, whereby the pitched flow crosses the individual rib rows.
  • all ribs are inclined in the same direction relative to the star center.
  • Neighboring rib stars opportunely have opposite direction of pitch, and these ribs, correspondingly have opposite angles of incidence.
  • FIG. 1 is a cross section of a nest or bundle of tubes in a heat exchanger system.
  • FIG. 2 is a projection of the periphery of a tube with six rows of ribs.
  • FIG. 3 is a cross section of an embodiment showing a quadrangular arrangement.
  • FIG. 4 is a diagram showing the effective temperature difference over a given rib length.
  • FIG. 5 is a plan view of a row of ribs according to FIG. 3.
  • FIGS. 6 and 7 show two manners of forming the ribs.
  • FIG. 8 is a cross section through a heat exchanger having three ribbed tubes in a jacket.
  • FIG. 9 is a plan view of
  • FIG. 9a a cross section through, a butterfly rib band in several stages of fabrication.
  • FIG. 10 is a plan view of a needle band in various fabrication stages.
  • FIG. 10a is a cross section of a portion of FIG. 10.
  • FIG. 11 is a plan view of a U-strap or -loop in various fabrication stages.
  • FIGS. 12 and 13 are longitudinal sections through two embodiments of heat exchangers provided with U-tubes.
  • FIG. 14 is a schematic in section of a heat exchanger equipped with ribbed tubes.
  • FIG. 15 is a section through a ribbed tube with an injector tube disposed therein.
  • FIG. 16 is a section through a tube provided with inner ribs.
  • FIG. 17 is a section
  • FIG. 18 is a plan view of, a stage of a tube manufacture.
  • FIG. 19 is a longitudinal section through
  • FIG. 20 is a cross section of, a ribbed tube according to a special embodiment of the invention.
  • FIG. 1 shows, in cross section, a triangular arrangement of a plurality of tubes 1 for heat exchangers according to the invention.
  • siX rows of ribs 2 are disposed which form stars of given pitch with the ribs of neighboring tubes, whereby three ribs of different tubes belong to each star in the arrangement shown.
  • FIG. 2 a projection of the periphery of a tube is shown having six rib rows. Neighboring rows of ribs 2 each have opposing angles of incidence 6 relative to each other. By means of angle 6 of the short ribs 2 which point in the direction of the current flow, the flow of the medi um is diverted in direction 3, and each rib obtains an independent current path. The slight depth of the ribs in the direction of the current flow is shown as 8, and
  • the depth 8 preferably is no more than 30 mm. for liquids and no more than 60 mm. for gases.
  • FIG. 3 shows, in cross section, an embodiment using a quadrangular, or square, arrangement.
  • tubes 1a, 1b, and 10 are provided with four rib rows 2a, 2b, and 20.
  • One rib of each of the four tubes, disposed on the corners of a square, is directed toward the common star center in the center of the square (its center of gravity). All ribs of this star have angles of incidence 6 which are of like direction relative to the star center, so that the medium, flowing in axial direction of the tubes, is imparted a superimposed pitch to the left or to the right, intersecting the rib rows.
  • the several current paths 4a, 4b, 4c of the medium are shown by lines and arrows.
  • the outermost, longest current path 40 e.g., consecutively intersects the four tubes.
  • This current path 40 corresponds to the largest volume and weight, respectively, of the medium to be heated, whereas current path 4a is comparatively short.
  • a considerably smaller weight of the medium to be heated therefore, belongs to path 4a, at approximately equally large heating surface of the ribs. This means that the heating surface per weight unit to be heated increases toward the star center 5. In this manner, the temperature decrease in the ribs substantially is compensated.
  • FIG. 4 is a diagram showing the eifective temperature difference 19 over rib length 10, starting from tube 1 to star center 5.
  • Line 13 denotes the corresponding current path volume or current path weight, respectively.
  • the rib opportunely is calculated, regarding length 10, rib thickness, rib material and u-value, so that the temperature difference 19a at the rib head is approximately 25 percent of the difference at the tube.
  • FIG. 5 is a plan view of a rib row according to FIG. 3.
  • the individual ribs 2a have a profile favoring the flow and also are arranged inclined by the angle of incidence 6 relative to the axial direction of the tubes.
  • These ribs may be cut from profiled bands and applied to tube 1a, according to FIG. 3, by butt welding, pressure welding, or similar process.
  • the entire ribbed tube 1b can consist of an extrusion piece having tube and ribs 2b in one piece. Then, according to FIG. 6, the originally continuous long ribs are slit and their ends 20 bent and thus are converted into short ribs having a diverting effect.
  • the ribbed tube (FIG. 3) can be formed by welding rib bands 2c (FIG. 7) thereto.
  • the bands are subdivided by slitting and bending into short ribs. The weld is shown in FIG. 3 as 24.
  • FIG. 8 shows the cross section through a heat exchanger according to the invention having three rib tubes in a jacket 12.
  • the tubes 1 are arranged triangularly, and each tube, in this embodiment, is provided with six dual rib sets 2c.
  • Each of the three tubes provides a rib pair 11'to the central rib star 5.
  • the rings 4 with arrows show the different pitch of the currents.
  • the incomplete rib stars i.e., those consisting of merely two or one rib pair 11, also cause a current pitch and encompass in this manner the zones outside the actual rib tubes and their ribs.
  • a rib tube is capable of transferring only a definite quantity of heat to which a definite volume of the exchange media ribs (in this embodiment double the amount) can be pro- I vided.
  • a strap or clamp surrounds the entire nest of tubes.
  • a strap or clamp surrounds the entire nest of tubes.
  • Rinsing or flushing means can be inserted in the compartively large cleansing channels 17.
  • a six-rib group system lends itself to simultaneous tripleor sextuple welding using the customary tn'phase current while avoiding the drawback of nonuniform phase load.
  • the tubes are provided with so-called butterfly rib bands 2c. These are installed alternately in opposed directions.
  • the ribs are shown on tubes 1d and 1e.
  • 2d is a butterfly needle band
  • 2e and 2 are U-loops or -straps. For the latter, the correlating rib pairs 11 of one ribbed tube are combined to a single unit.
  • FIG. 9 is a plan view of the butterfly rib band 20 in its several stages of fabrication.
  • An endless metal sheet strip 21 first is subdivided into short ribs by slitting on both sides 22. Thereafter, the ribs obtain a flow-favoring profile by upsetting the rectangular :slit edges 23, and, finally, in the third process step, both the ribs are bent upwardly in the shape of a V and provided with the angle of incidence 6 (see FIG. 9a). It is opportune to interpose a calibrating step in order to obtain a surface 24 exactly fitting tube 1 (see FIG; 3). This assures high-quality electric spotor seam welding without spattering and good heat contact.
  • both shanks of the V-shaped band have opposite angles of incidence.
  • FIG. 9a is a section through a rib row with upset edges 23.
  • FIG. 10 illustrates the several different fabrication steps of a needle band 20.
  • an endless metal sheet band is slit on both sides in distances of one to three times the thickness of the sheet 22 and then the strips 25 thus formed are bent differently into V-shape so that twicestaggered rows of needles are obtained (see FIG. 10a) providing sufficiently large cross sectional areas 26 transverse to the axis of the tube.
  • This band also is combined with the tube by spot-, spotand stitch-, seam-Welding, or by soldering, or in a similar manner.
  • the U-straps or -loops 2e and 2] as shown in FIG. 8 have angles of incidence in like direction.
  • the U-straps may be single units or else can be combined to bands by means of a clamp 27 disposed at the heads.
  • the U- straps are joined at their shank ends to the tube at 28. In the embodiment 22, these shank ends may be bent to form a straight line to enable automatic flash welding. From a caloric point of view, the embodiment having a staggering foot line is better; however, this permits solely butt press welding or soldering or a similar process.
  • the divisions of the shank ends on the periphery of the tubes are alike and, in this instance, are of said periphery.
  • FIG. 11 illustrates the several process steps of fabricating of U-strap or -loop having a staggered foot line 2
  • An endless metal sheet band first is perforated in the center, then is provided with sloping slits 22a, and the shank ends are given fitted cuts 28a. The shanks then are bent to U-shape. At the heads an uninterrupted strap 27 remains.
  • FIG. 12 shows a longitudinal section through a heat exchanger having U-tubes.
  • the upper shanks 30 of the U-tubes are provided with ribs, while the lower smooth shanks 31 have a very slight distance from each other.
  • the countercurrent principle advantageous from a heat transfer point of view, thus largely is utilized, especially if liquids traverse the inside of the tubes.
  • FIG. 13 Even more favorable is the embodiment according to FIG. 13.
  • a straight bundle or nest of rib tubes 30 is connected to a single reflux tube 33 by means of thin connecting tubes 32.
  • the thin tubes 32 also compensate for heat expansion and are installed in such a manner that accessibility to cleansing channels 17 from the front remains.
  • 34 is, e.g., an oil inlet, 35 an oil outlet, 36 a steam inlet, and 37 the condensate outlet.
  • FIG. 14 is a schematic in section of a heat exchanger having ribbed tubes 1d, which are closed on one end and are fastened solely at their open ends to tube sheet 38.
  • the heating medium water, steam
  • injector tubes 40 into the ribbed tubes 1d and flows back in opposite direction.
  • These ribbed tubes 1d are loose construction elements, gasketed with O-rings 53 so that they may readily be taken apart for cleaning purposes.
  • the ribbed tubes are held in place by the divided ring 54.
  • the injection tubes 40 herein also are loose elements, the tube sheet 38 is divided and has a neutral central zone 41 which prevents mutual contact of the two media in case of leaks. It also is feasible to put electric heating elements into the ribbed tubes.
  • FIG. 15 is a section through a ribbed tube 1 with an injection tube 40 disposed therein which carries a ribbed jacket 46.
  • the latter by means of the disposition of ribs 2g, similar to those shown in FIG. 2, provides for differently pitched currents especially in the case of liquids. These currents always contact the inner wall only at short stretches 47. This considerably increases the heat transfer effect which is highly important on account of the intense heat transmission to the outside through the pitched n'bs.
  • Jacket 46 opportunely is made of a material having low heat conductivity in order to reduce the undesirable heat transfer from the inside of the injector tube to the outer periphery of the ring.
  • FIG. 16 is a section through a tube having inside ribs 2h which also have a disposition similar to FIG. 2.
  • the arrows show a superimposed pitch of the current which considerably increases the heat transfer to the tube wall.
  • This tube is manufactured, as shown in FIG. 17 in section and in FIG. 18 in plan view, from a metal sheet band into which the ribs 2h previously had been rolled and also, if desired or required, outer ribs 21'.
  • the metal band then is bent to a tube and welded in the customary manner.
  • These tubes with internal ribs primarily are used for liquids.
  • FIG. 19 is a longitudinal section, and FIG. 20 a cross section, through a ribbed tube in vertical axial disposition wherein the current flow is effected essential by natural uplift or thermal convection.
  • This embodiment is suitable, among other purposes, for the heating of tanks.
  • more than six rib groups may be disposed on the periphery.
  • the arrows denote that, beside the pitched fiow 4, a suction current 48 of unaffected medium also occurs along the entire length of the tube which promotes a considerable increase in the heat transfer.
  • the heat exchange carries into the areas 49 which considerably exceed the areas of the ribs themselves.
  • This tank heating element also opportunely is closed solely on one side, whereby the lower, open, portion is connected to a single steam distributor pipe 50.
  • An injector tube 40a protrudes into pipe 54 ⁇ .
  • Injector tube 40a is provided with an opening 51 directed in opposition to the stream cur-rent 52 so that steam flows into the ribbed tube by means of the pressure head.
  • the condensate is removed from the wake of the injector tube 40a.
  • the steam distributor pipe 50 in this instance, also serves for the division of the condensate.
  • the slit width s 9 advantageously is larger than 10 mm.
  • the repeated slitting and the large quantity of short ribs and, thus, the large number of starting runs is practically of no significance at all due to the low velocities.
  • a heat exchanger having an essentially cylindrical, closed shell with inlet and outlet means disposed at the extreme ends of said shell, a plurality of tubes disposed therein, and inner and outer media flowing in and about said tubes, respectively, wherein at least one row of ribs is disposed on the outer periphery of said tubes, said tubes being disposed in geometrical relationship relative to each other, the spaces the-rebetween forming a definite pattern, one row of ribs on each tube pointing to the center of said pattern and forming stars of given pitch with ribs of adjoining tubes; the improvements which comprise said ribs being straight, blunt-ended, of equal length, and equidistantly disposed on said tubes; all ribs being inclined at like oblique angles of incidence relative to said 'tubes; ribs on one tube being inclined in like direction; neighboring tubes carrying ribs of opposite angles of in-. cidence, thereby causing a pitch in the flow of the outer medium about the center of said stars and thus a corkscre
  • a heat exchanger for liquids and gases comprising a substantially cylindrical closed shell; a plurality of tubes within said shell, disposed in geometrical relationship relative to each other; inner and outer media flowing in a said tubes, pointing toward each other thus forming pat and about said tubes, respectively; inlet and outlet means a for said media at the extreme ends of said shell; at least one row of short, straight, blunt-ended ribs of like size equidistantly disposed on the outer periphery of said tubes, inclined at like oblique angles of incidence relative to said tubes, pointing toward each other and forming a definite geometrical pattern with ribs of adjoining tubes; neighboring tubes carrying ribs of opposing angles of incidence, thereby causing a flow of the media parallel to the axis of said tubes and a corkscrew pitch in the flow of the outer medium about the center of said pattern, crossing individual rows of ribs tangentially to' a plurality of said tubes.
  • a heat exchanger for liquids and gases comprising a substantially cylindrical closed shell; a plurality of tubes within said shell in quadrangular disposition relative to each other; inner and outer media flowing in and about said tubes, respectively; inlet and outlet means for said media at the extreme ends of said shell; at least one row of short, straight, blunt-ended ribs of like size equidistantly disposed on the outer periphery of said tubes, inclined at like oblique angles of incidence relative to terns of squares with ribs of adjoining tubes; neighboring tubes carrying ribs of opposing angles of incidence, thereby causing a fiow of the media parallel to theraxis of said tubes and a corkscrew pitch in the flow of the outer medium about the center of said square, crossing individual rows of ribs tangentially to a plurality of tubes.
  • a heat exchanger for liquids and gases comprising a substantially cylindrical closedshell; a plurality of tubes within said shell, disposed ingeometiical relationship toward each other; inner and outer media flowing in and about said tubes, respectively, inlet and outlet means for said media atthe extreme ends of said shell; at least one row of short, straight, blunt-ended, V-shaped ribs of like size equidistan-tly disposed on the outer periphery of said tubes, inclined at like oblique angles of incidence relative to said tubes, pointing toward each other and forming a boring tubes; neighboring pairs of ribs contacting each other so as to form a plurality of inverted V-shapes on the periphery of said tubes.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US442033A 1964-03-24 1965-03-23 Heat exchanger tubes with longitudinal ribs Expired - Lifetime US3330336A (en)

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Application Number Priority Date Filing Date Title
DEG0040180 1964-03-24

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672446A (en) * 1969-01-21 1972-06-27 Airco Inc Ambient air vaporizer
US4072189A (en) * 1975-04-18 1978-02-07 Commissariat A L'energie Atomique Immersion-tube heat exchanger
US4162702A (en) * 1977-03-29 1979-07-31 Ab Svenska Maskinverken Device for dividing the flow in a heat exchanger
US4763726A (en) * 1984-08-16 1988-08-16 Sunstrand Heat Transfer, Inc. Heat exchanger core and heat exchanger employing the same
US5193359A (en) * 1992-01-08 1993-03-16 General Electric Company Spine fin refrigerator evaporator
US5251693A (en) * 1992-10-19 1993-10-12 Zifferer Lothar R Tube-in-shell heat exchanger with linearly corrugated tubing
US20080003325A1 (en) * 2006-06-30 2008-01-03 Seaver Richard T Baffle for mold cooling systems
US20150053379A1 (en) * 2012-03-19 2015-02-26 Bundy Refrigeration International Holding B.V. c/o Intertrust (Netherlands) B.V. Heat exchanger, method for its production as well as several devices comprising such a heat exchanger
CN105928409A (zh) * 2016-06-24 2016-09-07 茂名重力石化机械制造有限公司 斜翅翅片管防垢方法、斜翅翅片管及加热炉
CN105973053A (zh) * 2016-06-24 2016-09-28 茂名重力石化机械制造有限公司 一种纵翅翅片管及具有该翅片管的加热炉
USD1006966S1 (en) * 2021-05-05 2023-12-05 Stego-Holding Gmbh Convector heater

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1770320A (en) * 1926-06-25 1930-07-08 Morterud Einar Heat-transmitting apparatus
FR688641A (fr) * 1930-01-21 1930-08-27 Perfectionnements aux échangeurs thermiques, applicables aux chaudières, économiseurs et autres appareils
GB366262A (en) * 1930-01-20 1932-02-04 Henry Dieterlen Improvements in or relating to boilers, economisers and other heat interchangers
GB371347A (en) * 1930-01-20 1932-04-19 Henry Dieterlen Improvements relating to tubulous boilers economisers, and like heat exchange apparatus
US1920800A (en) * 1931-08-07 1933-08-01 Griscom Russell Co Heat exchanger
US1935412A (en) * 1931-06-12 1933-11-14 Griscom Russell Co Fluid cooler
US2322284A (en) * 1939-12-23 1943-06-22 Griscom Russell Co Heat exchanger
US2444908A (en) * 1946-06-06 1948-07-13 Babcock & Wilcox Co Fluid heat exchange installation
GB619672A (en) * 1944-08-10 1949-03-14 Chausson Usines Sa Improvements in the manufacture of tubes and/or nests of tubes for thermic exchange
DE835612C (de) * 1950-11-21 1952-04-03 Metallgesellschaft Ag Waermeaustauscher mit Laengsrippenrohren
GB670598A (en) * 1948-11-20 1952-04-23 Brown Fintube Co Improvements in and relating to air coolers and the like
CA578013A (en) * 1959-06-16 W. Gardes Alfred Extended surface tube and wire condenser
US2905447A (en) * 1956-05-04 1959-09-22 Huet Andre Tubular heat-exchanger
DE1065864B (de) * 1959-09-24
FR74384E (fr) * 1958-05-17 1960-11-07 Radiateur pour chauffages centraux à eau chaude ou à vapeur à basse pression
US3020027A (en) * 1958-11-12 1962-02-06 Babcock & Wilcox Ltd Heat exchanger tubes with radially extending fins transversely connected thereto and method of forming the same
US3118495A (en) * 1956-11-12 1964-01-21 David Dalin Method of cleaning heat exchangers

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA578013A (en) * 1959-06-16 W. Gardes Alfred Extended surface tube and wire condenser
DE1065864B (de) * 1959-09-24
US1770320A (en) * 1926-06-25 1930-07-08 Morterud Einar Heat-transmitting apparatus
GB366262A (en) * 1930-01-20 1932-02-04 Henry Dieterlen Improvements in or relating to boilers, economisers and other heat interchangers
GB371347A (en) * 1930-01-20 1932-04-19 Henry Dieterlen Improvements relating to tubulous boilers economisers, and like heat exchange apparatus
FR688641A (fr) * 1930-01-21 1930-08-27 Perfectionnements aux échangeurs thermiques, applicables aux chaudières, économiseurs et autres appareils
US1935412A (en) * 1931-06-12 1933-11-14 Griscom Russell Co Fluid cooler
US1920800A (en) * 1931-08-07 1933-08-01 Griscom Russell Co Heat exchanger
US2322284A (en) * 1939-12-23 1943-06-22 Griscom Russell Co Heat exchanger
GB619672A (en) * 1944-08-10 1949-03-14 Chausson Usines Sa Improvements in the manufacture of tubes and/or nests of tubes for thermic exchange
US2444908A (en) * 1946-06-06 1948-07-13 Babcock & Wilcox Co Fluid heat exchange installation
GB670598A (en) * 1948-11-20 1952-04-23 Brown Fintube Co Improvements in and relating to air coolers and the like
DE835612C (de) * 1950-11-21 1952-04-03 Metallgesellschaft Ag Waermeaustauscher mit Laengsrippenrohren
US2905447A (en) * 1956-05-04 1959-09-22 Huet Andre Tubular heat-exchanger
US3118495A (en) * 1956-11-12 1964-01-21 David Dalin Method of cleaning heat exchangers
FR74384E (fr) * 1958-05-17 1960-11-07 Radiateur pour chauffages centraux à eau chaude ou à vapeur à basse pression
US3020027A (en) * 1958-11-12 1962-02-06 Babcock & Wilcox Ltd Heat exchanger tubes with radially extending fins transversely connected thereto and method of forming the same

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672446A (en) * 1969-01-21 1972-06-27 Airco Inc Ambient air vaporizer
US4072189A (en) * 1975-04-18 1978-02-07 Commissariat A L'energie Atomique Immersion-tube heat exchanger
US4162702A (en) * 1977-03-29 1979-07-31 Ab Svenska Maskinverken Device for dividing the flow in a heat exchanger
US4763726A (en) * 1984-08-16 1988-08-16 Sunstrand Heat Transfer, Inc. Heat exchanger core and heat exchanger employing the same
US5193359A (en) * 1992-01-08 1993-03-16 General Electric Company Spine fin refrigerator evaporator
US5251693A (en) * 1992-10-19 1993-10-12 Zifferer Lothar R Tube-in-shell heat exchanger with linearly corrugated tubing
US20080003325A1 (en) * 2006-06-30 2008-01-03 Seaver Richard T Baffle for mold cooling systems
US20150053379A1 (en) * 2012-03-19 2015-02-26 Bundy Refrigeration International Holding B.V. c/o Intertrust (Netherlands) B.V. Heat exchanger, method for its production as well as several devices comprising such a heat exchanger
CN105928409A (zh) * 2016-06-24 2016-09-07 茂名重力石化机械制造有限公司 斜翅翅片管防垢方法、斜翅翅片管及加热炉
CN105973053A (zh) * 2016-06-24 2016-09-28 茂名重力石化机械制造有限公司 一种纵翅翅片管及具有该翅片管的加热炉
CN105973053B (zh) * 2016-06-24 2018-03-30 茂名重力石化装备股份公司 一种纵翅翅片管及具有该翅片管的加热炉
USD1006966S1 (en) * 2021-05-05 2023-12-05 Stego-Holding Gmbh Convector heater
USD1009234S1 (en) * 2021-05-05 2023-12-26 Stego-Holding Gmbh Convector heater
USD1009235S1 (en) * 2021-05-05 2023-12-26 Stego-Holding Gmbh Convector heater

Also Published As

Publication number Publication date
GB1106764A (en) 1968-03-20
DE1451221A1 (de) 1969-07-10

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