GB2039020A - Tubular structure particularly for heat exchangers - Google Patents
Tubular structure particularly for heat exchangers Download PDFInfo
- Publication number
- GB2039020A GB2039020A GB7943623A GB7943623A GB2039020A GB 2039020 A GB2039020 A GB 2039020A GB 7943623 A GB7943623 A GB 7943623A GB 7943623 A GB7943623 A GB 7943623A GB 2039020 A GB2039020 A GB 2039020A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- fluid
- tubular structure
- cross
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A tubular structure particularly for heat exchangers comprises a first circular cross-section tube 1 and a second multi-lobe cross-section tube 2 forcibly fitted therewithin. The tube 2 is obtained by rolling along the generatrix lines (7, 8, 9) a tube having originally the same cylindrical cross- sectional shape as the tube 1. <IMAGE>
Description
SPECIFICATION
Tubular structure, particularly for heat exchangers of the finned core type
This invention relates to a tubular structure, particularly for heat exchangers of the finned core type.
As is known, this type of heat exchangers comprise a plurality of parallel tubes, or pipes, supported by plates at their ends, the tubes being sometimes interconnected at such end plates to form one or more circuits in parallel.
Onto the tube outsides, fines are pressure fitted which also form passages through which ventilation air can be circulated.
It is essential, in such exchangers, to maximise the overall rate of thermal exchange between the fluid which is circulated through the tube nest and the environment, and it is a known fact that the overall rate of thermal exchange will depend on both the thermal exchange between the environmental medium and the tube outside surfaces, and the thermal exchange which takes place between the inside surfaces of the tubes and the fluid being circulated through the tubes themselves.
This invention sets out to provide a tubular structure, intended for circulation of a fluid therethrough, which ensures an improved rate of thermal exchange between the fluid and the tubular structure itself.
Within that general aim, it is possible to arrange that the tubular structure according to the invention has component parts which are easily manufactured and assembled, as well as of relatively low cost.
According to one aspect of the present invention, there is provided a tubular structure, particularly for heat exchangers, characterised in that it comprises a first annular cross-section tube and a second multiple-lobe cross-section tube forcibly fitted inside said first tube, and fully immersed in the fluid being circulated therethrough.
Further features and advantages of the invention will become more apparent from a detailed description of a preferred, though not limitative, embodiment thereof, in conjunction with the accompanying drawing, where:
Figure 1 is a partly cut-away isometric view of the instant structure; and
Figure 2 is a cross-sectional view, as taken in a plane perpendicular to the axis of the instant tubular structure.
With reference to the cited drawing figures, the inventive structure comprises a first tube 1 of circular cross-section, a fluid being caused to flow through the'tube in a conventional manner. Inside the first tube 1, there is inserted a second tube 2, which is fully immersed in the fluid and has a lobed type of cross-section including three lobes, 4, 5, 6 respectively. This three-lobe cross-sectional configuration is preferably obtained by mechanical deformation, as carried out on a rolling machine along generatrix lines 7, 8, 9 of a tube which was originally absolutely identical to the first tube 1.
Said second tube 2 can be nested inside the
tube 1 to a pressure fit, because its three-lobe
cross-section can be enveloped by a cylindrical
surface set to interfere slightly with the inside
surface of the first tube 1.
Thus, three areas of contact between the two
tubes are created, respectively at 10, 1 1, 12
which form thermal bridges allowing the heat, the
second tube 2 picks up from the fluid circulated
through it, to be transferred to the first, or outside,
tube 1.
When it is considered that the rate of thermal
exchange between a fluid flowing through a duct
and the duct itself is a linear function of the lapped
surface area, it will become apparent that the
exchange surface area has now been almost
trebled with respect to the surface area to be
obtained with an ordinary cylindrical tube. In fact,
to the inside surface area of the first tube 1 ,the inside and outside surface areas, which are both
lapped by the fluid, of the second tube 2 should be
added.
Even when the load drop occurring on account
of the reduced useful flow section for the
passage of the fluid through the first tube 1 is
considered, a substantial increase of the thermal
exchange rate is achieved and, by virtue of the simple construction of the instant structure, the
efficiency-to-cost ratio is also improved.
It should be further noted that the second tube 2 is produced by cold processing the same type of tube stock as utilised for the first tube 1, thereby it
is unnecessary to make different stocks available.
Obviously, the second tube 2 may be formed with any number of lobes, the lobes of different shapes without departing from the scope of the
invention.
1. A tubular structure, particularly for heat exchangers, characterised in that it comprises a first annular cross-section tube and a second multiple-lobe crnss-secti6n tube forcibly fitted inside said first tube and fully immersed in the fluid being circulated therethrough.
2. A tubular structure according to Claim 1, characterised in that said second tube is obtained by a rolling process performed along generatrix lines of a tube having originally the same cylindrical cross-sectional shape as said first tube.
3. A tubular structure according to Claim 1 characterised in that said second tube has a threelobe cross-sectional configuration which is envelopable by a cylindrical surface.
4. A tubular structure according to Claim 1, characterised in that said second tube is nested to a pressure fit inside said first tube such as to create, by deformation of said tubes, contact areas constituting thermal bridges allowing the heat picked up by said second tube from the fluid lapping it to be transferred from said second or internal tube to said first or external tube.
5. A tubular structure substantially as herein
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A tubular structure, particularly for heat exchangers, characterised in that it comprises a first annular cross-section tube and a second multiple-lobe crnss-secti6n tube forcibly fitted inside said first tube and fully immersed in the fluid being circulated therethrough.
2. A tubular structure according to Claim 1, characterised in that said second tube is obtained by a rolling process performed along generatrix lines of a tube having originally the same cylindrical cross-sectional shape as said first tube.
3. A tubular structure according to Claim 1 characterised in that said second tube has a threelobe cross-sectional configuration which is envelopable by a cylindrical surface.
4. A tubular structure according to Claim 1, characterised in that said second tube is nested to a pressure fit inside said first tube such as to create, by deformation of said tubes, contact areas constituting thermal bridges allowing the heat picked up by said second tube from the fluid lapping it to be transferred from said second or internal tube to said first or external tube.
5. A tubular structure substantially as herein described with reference to the accompanying drawing.
6. Any novel element, or combination of elements, herein described and-or shown in the accompanying drawing, irrespective of whether the present claim is within the scope of, or relates to the same invention as, any of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT7830889U IT7830889V0 (en) | 1978-12-19 | 1978-12-19 | TUBULAR STRUCTURE PARTICULARLY FOR HEAT EXCHANGERS. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2039020A true GB2039020A (en) | 1980-07-30 |
Family
ID=11232683
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7943623A Withdrawn GB2039020A (en) | 1978-12-19 | 1979-12-18 | Tubular structure particularly for heat exchangers |
Country Status (6)
Country | Link |
---|---|
DE (1) | DE2949690A1 (en) |
ES (1) | ES247913U (en) |
FR (1) | FR2444916A1 (en) |
GB (1) | GB2039020A (en) |
IT (1) | IT7830889V0 (en) |
SE (1) | SE7910326L (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0191515A1 (en) * | 1985-02-12 | 1986-08-20 | Jogema Holding B.V. | Composite tube for heating gases |
US8267033B2 (en) | 2008-01-22 | 2012-09-18 | Lockheed Martin Corporation | Clathrate glider with heat exchanger |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2136482B1 (en) * | 1995-10-03 | 2000-08-16 | Grau Asuncion Gallart | THERMAL CONDITIONING SYSTEM FOR CONDUCTING FLUIDS TOWARD PURIFYING FILTERS. |
-
1978
- 1978-12-19 IT IT7830889U patent/IT7830889V0/en unknown
-
1979
- 1979-12-11 DE DE19792949690 patent/DE2949690A1/en not_active Withdrawn
- 1979-12-14 SE SE7910326A patent/SE7910326L/en unknown
- 1979-12-18 GB GB7943623A patent/GB2039020A/en not_active Withdrawn
- 1979-12-18 FR FR7930919A patent/FR2444916A1/en not_active Withdrawn
- 1979-12-19 ES ES1979247913U patent/ES247913U/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0191515A1 (en) * | 1985-02-12 | 1986-08-20 | Jogema Holding B.V. | Composite tube for heating gases |
US4817672A (en) * | 1985-02-12 | 1989-04-04 | Jogema Holding B.V. | Composite tube for heating gases |
US8267033B2 (en) | 2008-01-22 | 2012-09-18 | Lockheed Martin Corporation | Clathrate glider with heat exchanger |
Also Published As
Publication number | Publication date |
---|---|
FR2444916A1 (en) | 1980-07-18 |
ES247913U (en) | 1980-04-16 |
SE7910326L (en) | 1980-06-20 |
DE2949690A1 (en) | 1980-07-03 |
IT7830889V0 (en) | 1978-12-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |