WO1994023256A1 - Tube heat exchanger and a method of production of its heat exchanging elements - Google Patents
Tube heat exchanger and a method of production of its heat exchanging elements Download PDFInfo
- Publication number
- WO1994023256A1 WO1994023256A1 PCT/CZ1993/000007 CZ9300007W WO9423256A1 WO 1994023256 A1 WO1994023256 A1 WO 1994023256A1 CZ 9300007 W CZ9300007 W CZ 9300007W WO 9423256 A1 WO9423256 A1 WO 9423256A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- tubes
- heat exchanging
- heat
- heat exchanger
- Prior art date
Links
Classifications
-
- 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
- F28D7/02—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 helically coiled
- F28D7/024—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 helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
Definitions
- the invention relates to a heat exchanging apparatus sub ⁇ stantially consisting of a tube heat exchanging surface, tube plates, a shell, usually of the cylindrical shape, bottoms at the ends and the appropriate input and output nozzles situated in the bottoms and in the shell.
- the already disclosed tube heat exchangers are provided with a heat exchanging surface made most often from straight heat exchanging tubes, eventually from traditional helically wound tubes situated alternately in right-handed and left-handed coaxial cylindrical layers.
- the heat exchanging tubes having their ends fastened in the tube plates are mounted in the support and distance design elements that may be considered from the hydraulic and thermal points of view as passive elements.
- the existence of such elements as well as of the simultaneously used various hydraulic partitions in the most commonly used heat exchangers with straight heat exchanging tubes is a design, production and operational disadvantage of the existing tube heat exchangers.
- ISA/EP based on a new geometry ' of the heat exchanging elements an which consists substantially in that the heat exchangin surface of the heat exchanger is formed by slende right-handed and/or left-handed helical heat exchangin tubes that are preferably identical.
- the tubes are oriente in the tube plates equally or alternately and ar mutually turned a little bit. It is preferable if the eve or odd tubes are turned by the same angle that is belo 180°. At the same time their external or contour diameter i bigger than their pitch in the tube plates. Thereby, i case of the appropriate helix lead numerous uniformly space contact spots are established in the heat exchanging surfac and significant hydraulic and heat exchanging intensifica tion effects are observed. The frequency of the contac points and the magnitude of the intensification effects ar proportional also to the spatial curvature of the helica heat exchanging tubes.
- the new heat exchangin surface is self-supporting, eliminates the vibration possi bility of the individual heat exchanging tubes. Thereby their service life and reliability of their attachment t the tube plates with regard to the long-time tightness ar increased. Therefore, the heat exchanging surface can b very thin-walled what contributes together with the signi ficant heat transfer intensification to a substantia increase in the specific heat transfer capacity.
- the helica heat exchanging tubes have both very good self-compensatin properties and substantially shorter design length at th same "thermal" length that is roughly equal to the length o the straight tube used for manufacture.
- each dimen ⁇ sional type of the helical heat exchanging tubes can for differently compact heat exchanging surfaces.
- E. g. a mer slight turning of all even or "second" helical heat exchan ⁇ ging tubes in the tube plates makes possible to change th pitch of the square pattern in a large extent given by th geometric parameters of the respective helical heat exchan ging tube.
- the quasi-helical tubes for some modified designs of the heat exchanging surface.
- Such tubes consist of straight and plane bends sections positioned alternately.
- the quasi-helical heat exchanging tube of square contour is suitable for low pressure heat exchangers with rectangula or squarish cross section of the shell.
- a consequence of the intensifying effects and the design advantages is that the new tube heat exchanger is smaller, lighter and cheaper tha the existing tube heat exchanger.
- Secondary but also valu ⁇ able advantages are savings of the floor surface and con ⁇ struction space for installation of such smaller and lighter heat exchanging apparatuses.
- the presented design of the heat exchanging surface is highly compatible with the progressive design of the tube heat exchangers with th doubled tube plates and the two-wall heat exchanging tubes. Owing to the substantially increased turbulence outside an inside the helical heat exchanging tubes caused by their bi spacial curvature, fouling of the heat exchanging surface by impurities of the operational heat transferring media will be decreased.
- the new geometry of the heat exchanging elements require also new methods of their production.
- the methods depend o the required slenderness of the helical heat exchangin tubes that can be defined here only by the ratio between th contour diameter of the manufactured helix and the externa diameter of the applied straight tube.
- the optimal slender ness is in the range from 2 to 5.
- the helical heat exchan ging tubes having different slenderness are less suitable o inapplicable.
- the method of production of the very slende helical heat exchanging tubes having the slenderness equa or near to 2 consists in principle in twisting at best tw or three tubes simultaneously in their full length. In cas of production of less slender helical heat exchanging tube it is suitable to wind the tube on a thin bar and sub sequently axially stretch the formed helix to diminish it contour diameter i.e. to increase its slenderness.
- the compact heat exchanging surface according to Figure 1 i as an example formed by right-handed heat exchanging tube 1 . oriented uniformly azimuthally in the holes of the tub plates situated near above and deep below to the depicte horizontal cross section.
- the pitch i evidently determined also by the led of the helix, not show in this figure, which is in this example 120 mm.
- the rati D T is the sine of the central helix angle having diamete D s .
- a hybrid heat exchanging surface according to the schemat Figure 2 showing partial longitudinal section is formed fr uniform combined heat exchanging tubes 3_> ⁇ t ⁇ e tubes a fastened in the tube plates 2 alternately always on t opposite side in a square pattern.
- the combined heat excha ging tubes 3_ have helical about one half of the total desi length and the other half is straight.
- D E D + 2M
- T D +
- the characteristic dimensions are marked identically both the Figure 1 and the Figure 2.
- H in the Figure 2 means t led of the helix.
- the apparatus according to the invention can be used in the feed water recovery systems, in the steam-gas cycles in the utilization of waste heat from industrial ovens, from offgas of the gas turbines and the piston gas engines as well as from the supercharged Diesel engines of big or medium output.
- the chemical industry it can be utilized also in all technological processes that require output or input of heat to or from apparatuses where exothermic or endothermic chemical reactions are carried out.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CZ1993/000007 WO1994023256A1 (en) | 1993-03-31 | 1993-03-31 | Tube heat exchanger and a method of production of its heat exchanging elements |
EP93908793A EP0642653A1 (en) | 1993-03-31 | 1993-03-31 | Tube heat exchanger and a method of production of its heat exchanging elements |
AU39471/93A AU3947193A (en) | 1993-03-31 | 1993-03-31 | Tube heat exchanger and a method of production of its heat exchanging elements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CZ1993/000007 WO1994023256A1 (en) | 1993-03-31 | 1993-03-31 | Tube heat exchanger and a method of production of its heat exchanging elements |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1994023256A1 true WO1994023256A1 (en) | 1994-10-13 |
WO1994023256B1 WO1994023256B1 (en) | 1994-11-10 |
Family
ID=5469131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CZ1993/000007 WO1994023256A1 (en) | 1993-03-31 | 1993-03-31 | Tube heat exchanger and a method of production of its heat exchanging elements |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0642653A1 (en) |
AU (1) | AU3947193A (en) |
WO (1) | WO1994023256A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112666209A (en) * | 2020-12-02 | 2021-04-16 | 西南交通大学 | Method for evaluating heat transfer strengthening capability of forced oil circulation guide winding |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1916888A (en) * | 1932-09-03 | 1933-07-04 | American Laundry Mach Co | Heat reclaimer |
DE2837802A1 (en) * | 1978-02-17 | 1979-08-23 | Hydro System Srl | Large surface area heat exchanger - has parallel or nested helical plastics tubes supported in end plates and connected to collectors |
WO1984000207A1 (en) * | 1982-06-29 | 1984-01-19 | Zander & Ingestroem | Tube heat exchanger |
GB2213922A (en) * | 1987-12-14 | 1989-08-23 | Atomic Energy Authority Uk | Heat exchanger |
EP0435839A2 (en) * | 1989-12-27 | 1991-07-03 | Elge Ab | Heat exchanger and a method for its fabrication |
SU1686297A1 (en) * | 1989-07-31 | 1991-10-23 | Южный Научно-Исследовательский Проектно-Конструкторский Институт Морского Флота | Heat exchange staggered-structure tube bundle |
-
1993
- 1993-03-31 WO PCT/CZ1993/000007 patent/WO1994023256A1/en not_active Application Discontinuation
- 1993-03-31 AU AU39471/93A patent/AU3947193A/en not_active Abandoned
- 1993-03-31 EP EP93908793A patent/EP0642653A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1916888A (en) * | 1932-09-03 | 1933-07-04 | American Laundry Mach Co | Heat reclaimer |
DE2837802A1 (en) * | 1978-02-17 | 1979-08-23 | Hydro System Srl | Large surface area heat exchanger - has parallel or nested helical plastics tubes supported in end plates and connected to collectors |
WO1984000207A1 (en) * | 1982-06-29 | 1984-01-19 | Zander & Ingestroem | Tube heat exchanger |
GB2213922A (en) * | 1987-12-14 | 1989-08-23 | Atomic Energy Authority Uk | Heat exchanger |
SU1686297A1 (en) * | 1989-07-31 | 1991-10-23 | Южный Научно-Исследовательский Проектно-Конструкторский Институт Морского Флота | Heat exchange staggered-structure tube bundle |
EP0435839A2 (en) * | 1989-12-27 | 1991-07-03 | Elge Ab | Heat exchanger and a method for its fabrication |
Non-Patent Citations (1)
Title |
---|
SOVIET PATENTS ABSTRACTS Section PQ Week 9239, 11 November 1992 Derwent World Patents Index; Class Q72, AN 92-321683 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112666209A (en) * | 2020-12-02 | 2021-04-16 | 西南交通大学 | Method for evaluating heat transfer strengthening capability of forced oil circulation guide winding |
CN112666209B (en) * | 2020-12-02 | 2022-07-19 | 西南交通大学 | Method for evaluating heat transfer enhancement capability of forced oil circulation guide winding |
Also Published As
Publication number | Publication date |
---|---|
AU3947193A (en) | 1994-10-24 |
EP0642653A1 (en) | 1995-03-15 |
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