WO1997005441A1 - Heat exchanger of 'tube-in-tube' type - Google Patents
Heat exchanger of 'tube-in-tube' type Download PDFInfo
- Publication number
- WO1997005441A1 WO1997005441A1 PCT/UA1996/000010 UA9600010W WO9705441A1 WO 1997005441 A1 WO1997005441 A1 WO 1997005441A1 UA 9600010 W UA9600010 W UA 9600010W WO 9705441 A1 WO9705441 A1 WO 9705441A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- heat exchanger
- heat
- heated
- weight
- 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
- F28D7/022—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 two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration
-
- 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
- F28D7/106—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 consisting of two coaxial conduits or modules of two coaxial conduits
Definitions
- the invention relates to heat exchanging equipment and is to be used in household and various branches of industry.
- Background Art At present such heat exchangers are used in industry and household as described in "Directory on plumbing fixture on factories of public service" after N.B.Bahenkov and B.V.Kuznetsov (p.25).
- Such heat exchangers have a case in the form of cylinder, inside which brass tubes with diameter 16 mm are located between tube boards.. Heat transfer is carried out through walls of brass tubes. For extending of surface of heat transfer the quantity of tubes is increased.
- Heat exchanging element of "tube-in-tube” type is known (author's license of the USSR #932184), in which the inner tube has a section that changes stepwise in the direction of flow.
- the outer tube has cross-section that changes stepwise in the direction of flow, and its steps are shifted with respect to steps of inner tube.
- the latter are provided with grooves on the outlet butt-end.
- Outer and inner tubes are made in the form of bellows, and grooves - in the form of corrugations.
- Disadvantage of the known element is as follows: in the structure made of thin- wall tubes the effect from stepwise changing of section is negligible as the result of little difference in diameters; besides improving of heat exchange occurs only in places of step transition.
- each element of the outer or inner tubes has significant length, so, in spite of steps a heat preventing boundary layer is formed on its surface, pressure gradient occurs only in transition points from one section to another, that amplifies turbulization and intesifies heat exchange, due to constant section of each tube element.
- Heat exchanger of "tube-in-tube” is known (author's license of the USSR #1695119) that contains spiral ribs, located on the inner tube with a gap with respect to the outer tube; at that the latter has feed and exhaust nipples of intertube medium which are located tangentially; on the surface of ribs from the side of feed nipple shoulder blades are made which adjoin to rib edges and are located with a gap with respect to inner tube. Presence of shoulder blades provides direction of flow of heat carrier to the surface of the inner tube; it increases the heat output, but such design is complicated in manufacturing.
- Heat exchanger is known (author's license of the USSR #1511567) that contains outer and inner tubes arranged with variable gap; the latter tube has a round section, and is provided with spiral ribs adjoining to walls of the outer tube; at that, outer tube has a section of elliptical shape of ellipse and is arranged coaxially with the inner tube.
- the most close heat exchanger design to this being declared is the heat exchanger registered by author's license of the USSR #595619.
- the inner tube is provided with spiral ribs arranged with a gap in the outer tube, that has fittings for heated medium; at that, the gap is of constant size that is less than step of spiral ribs by
- an electric heater is positioned on the inner tube along its axis, fittings are arranged tangentially.
- heat exchangers have big weight and length and they are complicated in manufacturing. Thereby at present they are not used in industry and household.
- the main goal of invention is improvement of the known heat exchanger design that contains two tubes set up one inside another. Effect is achieved due to change of shape of heat exchanger which provides high turbulization of moving flows of heat carrier in the inner tube and of hquid to be heated in intertube space, one towards another. It allows to maintain high productivity as well as simplify the design of the heat exchanger with relatively small weight and length, due to ehmination of additional elements which increase surface of heating.
- This task posed is solved as follows: the heat exchanger of "tube-in-tube" contains two tube set up with gap between them; fitting of inlet of liquid to be heated is located from the side of heat carrier outlet; fitting of outlet of hquid to be heated is located from the side of heat carrier inlet.
- the heat exchanger is made in the form of spiral helix.
- Such design of the heat exchangers in the form of spiral helix allowed to intensify whirls in each coil of spiral, heat exchange between them has been improved, heat transfer coefficient is increased.
- heat transfer coefficient is increased.
- it allows to shorten the surface of heat exchange i. e. decrease his height by 4-5 times, diameter by 3-4 times, weight by 6-10 times, consumption of heat carrier by 2 times as well as simplify its design in comparison with heat exchangers that are currently used in industry.
- Figure 1 shows the schematic of heat exchanger proposed.
- Figure 2 shows the left side view of figure 1 with the fragmentary inner sight.
- Heat exchanger consists of outer tube 1 and inner tube 2 made in the form of spiral helix and set up with the gap between them. On the inner tube 2 fittings 3 and 4 are set up for inlet and outlet of the heat carrier, respectively. On the outer tube 1 fittings 5 and 6 are set up for inlet and outlet of hquid to be heated, respectively. Heat exchanger works like as follows. Heat ca ⁇ ier flows along the inner tube 2 through fitting 3 from the one side and hquid to be heated in the intertube space between tubes 1 and 2 through fitting 5 from the another side are directed simultaneously towards one another.
- High grade of turbulization along with whirls in coils of tube helix excludes completely stagnant zones and improves heat transfer. Intensity of heat transfer is increased as well along with flows of heat ca ⁇ ier and hquid to be heated that are directed towards one another, that enables decreasing of heat exchanger surface. This allows to decrease the size of heat exchanger, its weight, consumption of heat carrier, but at the same time preserves high productivity of heat transfer. Such design of heat exchanger provides full utilization of all its surface.
- the table shows that along with the same productivity 667 liter/hour the offered heat exchanger with length 400 mm and heat exchanger #3075 with length 2,155 mm, consumption of heat carrier decreases by 2 times, weight of heat exchanger decreases by 10 times, length - by 4 times, diameter - by 2 times.
- Offered heat exchanger is to be widely used in household, petroleum, food and enrergy industries, especially where its weight and dimensions are limited.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Proposed invention belongs to heat exchanging equipment and can be used in household and in various ranches of industry and especially where its weight and size are limited. Heat exchanger of 'tube-in-tube' type contains two tubes (1 and 2) located with a gap between them. Inlet fitting for liquid to be heated (5) is located from the side of heat carrier outlet (4) and outlet fitting for liquid to be heated (6) is located from the side of heat carrier inlet (3), while the heat exchanger is made in the form of spiral helix. The heat exchanger proposed allows, due to changing its shape, to decrease its weight and length, to simplify its design, and, due to eliminating additional elements that increase the surface of heating, but at the same time it preserves high productivity of heat exchanger.
Description
HEAT EXCHANGER OF "TUBE-IN-TUBE" TYPE
Technical Field
The invention relates to heat exchanging equipment and is to be used in household and various branches of industry. Background Art At present such heat exchangers are used in industry and household as described in "Directory on plumbing fixture on factories of public service" after N.B.Bahenkov and B.V.Kuznetsov (p.25). Such heat exchangers have a case in the form of cylinder, inside which brass tubes with diameter 16 mm are located between tube boards.. Heat transfer is carried out through walls of brass tubes. For extending of surface of heat transfer the quantity of tubes is increased.
Thereby such heat exchangers are complicated in manufacturing and have big dimensions.
There were attempts to make heat exchangers of "tube-in-tube" type, that were resulted in creation of heat exchangers of big length. Attempts to decrease length of heat exchangers were confined by increasing heating surface due to additional devices (appliances) - ribs which are made in the form of spiral helix. On the one hand, it has not given desired decrease of length, on the other hand, it resulted in complication of design.
Heat exchanging element of "tube-in-tube" type is known (author's license of the USSR #932184), in which the inner tube has a section that changes stepwise in the direction of flow. The outer tube has cross-section that changes stepwise in the direction of flow, and its steps are shifted with respect to steps of inner tube. The latter are provided with grooves on the outlet butt-end. Outer and inner tubes are made in the form of bellows, and grooves - in the form of corrugations. Disadvantage of the known element is as follows: in the structure made of thin- wall tubes the effect from stepwise changing of section is negligible as the result of little difference in diameters; besides improving of heat exchange occurs only in places of step transition. If each element of the outer or inner tubes has significant length, so, in spite of steps a heat preventing boundary layer is formed on its surface, pressure gradient occurs only in transition points from one section to another, that amplifies turbulization and intesifies heat exchange, due to constant section of each tube element.
Heat exchanger of "tube-in-tube" is known (author's license of the USSR #1695119) that contains spiral ribs, located on the inner tube with a gap with respect to
the outer tube; at that the latter has feed and exhaust nipples of intertube medium which are located tangentially; on the surface of ribs from the side of feed nipple shoulder blades are made which adjoin to rib edges and are located with a gap with respect to inner tube. Presence of shoulder blades provides direction of flow of heat carrier to the surface of the inner tube; it increases the heat output, but such design is complicated in manufacturing.
Heat exchanger is known (author's license of the USSR #1511567) that contains outer and inner tubes arranged with variable gap; the latter tube has a round section, and is provided with spiral ribs adjoining to walls of the outer tube; at that, outer tube has a section of elliptical shape of ellipse and is arranged coaxially with the inner tube.
The most close heat exchanger design to this being declared, is the heat exchanger registered by author's license of the USSR #595619. The inner tube is provided with spiral ribs arranged with a gap in the outer tube, that has fittings for heated medium; at that, the gap is of constant size that is less than step of spiral ribs by
1-6 mm; an electric heater is positioned on the inner tube along its axis, fittings are arranged tangentially.
Abovementioned heat exchangers have big weight and length and they are complicated in manufacturing. Thereby at present they are not used in industry and household.
Disclosure of the Invention
The main goal of invention is improvement of the known heat exchanger design that contains two tubes set up one inside another. Effect is achieved due to change of shape of heat exchanger which provides high turbulization of moving flows of heat carrier in the inner tube and of hquid to be heated in intertube space, one towards another. It allows to maintain high productivity as well as simplify the design of the heat exchanger with relatively small weight and length, due to ehmination of additional elements which increase surface of heating. This task posed is solved as follows: the heat exchanger of "tube-in-tube" contains two tube set up with gap between them; fitting of inlet of liquid to be heated is located from the side of heat carrier outlet; fitting of outlet of hquid to be heated is located from the side of heat carrier inlet. The heat exchanger is made in the form of spiral helix.
Such design of the heat exchangers in the form of spiral helix allowed to intensify whirls in each coil of spiral, heat exchange between them has been improved, heat transfer coefficient is increased. Along with preservation of high productivity it allows to shorten the surface of heat exchange i. e. decrease his height by 4-5 times, diameter by 3-4 times, weight by 6-10 times, consumption of heat carrier by 2 times as well as simplify its design in comparison with heat exchangers that are currently used in industry.
Brief Description of the Drawings
Figure 1 shows the schematic of heat exchanger proposed. Figure 2 shows the left side view of figure 1 with the fragmentary inner sight.
Heat exchanger consists of outer tube 1 and inner tube 2 made in the form of spiral helix and set up with the gap between them. On the inner tube 2 fittings 3 and 4 are set up for inlet and outlet of the heat carrier, respectively. On the outer tube 1 fittings 5 and 6 are set up for inlet and outlet of hquid to be heated, respectively. Heat exchanger works like as follows. Heat caπier flows along the inner tube 2 through fitting 3 from the one side and hquid to be heated in the intertube space between tubes 1 and 2 through fitting 5 from the another side are directed simultaneously towards one another.
High grade of turbulization along with whirls in coils of tube helix excludes completely stagnant zones and improves heat transfer. Intensity of heat transfer is increased as well along with flows of heat caπier and hquid to be heated that are directed towards one another, that enables decreasing of heat exchanger surface. This allows to decrease the size of heat exchanger, its weight, consumption of heat carrier, but at the same time preserves high productivity of heat transfer. Such design of heat exchanger provides full utilization of all its surface.
In connection with the feature that heat exchangers described above are not used in domestic industry we include a table of comparative performances of the heat exchanger offered and those of heat exchangers described in "Directory on plumbing fixture on factories of pubhc service" after N.B.Bahenkov and B.V.Kuznetsov (p.25). Principle of heat exchanger's work and heat transfer rate was examined on the model with the diameter of the outer tube 26.75 mm, thickness of the wall 2.75 mm and diameter of the inner tube 16 mm and thickness of the wall 2 mm. Heat transfer rate that has been obtained experimentally is equal:
K = 692 Kcal/m2 gramm*hour.
The heat transfer rate obtained is compared with the rates of existing heat exchangers (see table).
Table
Parameters Type of heat exchanger
3075 #1 Proposed 3077 Proposed
#2.5
1. Productivity liter/hour 667 667 1667 1667
2. Temperature of heat carrier at °C 100 100 100 100 inlet
3. Temperature of heat carrier at °c 70 40 70 40 outlet
4. Temperature of hquid to be °C 10 10 10 10 heated at inlet
5. Temperature of hquid to be "C 60 60 60 60 heated at outlet
6. Consumption of heat carrier liter/hour 1112 556 2778 1339
7. Weight kg 428 40 677.6 100
8. Length mm 2155 400 2813 1000
9. Diameter mm 916 550 1216 550
The table shows that along with the same productivity 667 liter/hour the offered heat exchanger with length 400 mm and heat exchanger #3075 with length 2,155 mm, consumption of heat carrier decreases by 2 times, weight of heat exchanger decreases by 10 times, length - by 4 times, diameter - by 2 times.
At equal productivity of 1,667 liter/hour of the heat exchanger taken for comparison with the length of 2813 mm and the offered heat exchanger with the length of 1000 mm, consumption of heat carrier decreased by 2 times, weight by 6 times, length by 3 times, diameter by 2 times.
Offered heat exchanger is to be widely used in household, petroleum, food and enrergy industries, especially where its weight and dimensions are limited.
Claims
Heat exchanger of "tube-in-tube" type that contains two tubes located with a gap between them, while inlet fitting of hquid to be heated is located from the side of heat carrier outlet and outlet fitting of hquid to be heated is located from the side of heat carrier inlet, characterised by that the heat exchanger is made in the form of spiral helix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/UA1996/000010 WO1997005441A1 (en) | 1995-07-28 | 1996-07-17 | Heat exchanger of 'tube-in-tube' type |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| UA95073555 | 1995-07-28 | ||
| PCT/UA1996/000010 WO1997005441A1 (en) | 1995-07-28 | 1996-07-17 | Heat exchanger of 'tube-in-tube' type |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1997005441A1 true WO1997005441A1 (en) | 1997-02-13 |
| WO1997005441B1 WO1997005441B1 (en) | 1997-04-17 |
Family
ID=21688700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/UA1996/000010 WO1997005441A1 (en) | 1995-07-28 | 1996-07-17 | Heat exchanger of 'tube-in-tube' type |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1997005441A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1103775A2 (en) * | 1999-11-23 | 2001-05-30 | Heatex B.V. | Heat exchanger and water heating system using same |
| WO2006074699A1 (en) * | 2004-12-23 | 2006-07-20 | Uli Jakob | Absorption refrigerator |
| WO2015168758A1 (en) * | 2014-05-08 | 2015-11-12 | Ramalho Bernardo Nogueira | Arrangement for a liquid-refrigeration system for use on movable trolleys and the like |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU311124A1 (en) * | Ю. Г. Глазов, Г. А. Штарк , И. И. Гольберт Одесский завод холодильного машиностроени | MULTI SECTION HEAT EXCHANGER TYPE "PIPE IN A PIPE" | ||
| US3477501A (en) * | 1967-12-12 | 1969-11-11 | Stork & Co Nv | Heat exchanger |
| US3976129A (en) * | 1972-08-17 | 1976-08-24 | Silver Marcus M | Spiral concentric-tube heat exchanger |
| FR2455720A1 (en) * | 1979-05-03 | 1980-11-28 | Schmoele Metall R & G | Heat exchanger partic. for fluorocarbon evaporative cooling - runs refrigerant through internally channelled tube inside secondary fluid outer tube |
-
1996
- 1996-07-17 WO PCT/UA1996/000010 patent/WO1997005441A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU311124A1 (en) * | Ю. Г. Глазов, Г. А. Штарк , И. И. Гольберт Одесский завод холодильного машиностроени | MULTI SECTION HEAT EXCHANGER TYPE "PIPE IN A PIPE" | ||
| US3477501A (en) * | 1967-12-12 | 1969-11-11 | Stork & Co Nv | Heat exchanger |
| US3976129A (en) * | 1972-08-17 | 1976-08-24 | Silver Marcus M | Spiral concentric-tube heat exchanger |
| FR2455720A1 (en) * | 1979-05-03 | 1980-11-28 | Schmoele Metall R & G | Heat exchanger partic. for fluorocarbon evaporative cooling - runs refrigerant through internally channelled tube inside secondary fluid outer tube |
Non-Patent Citations (1)
| Title |
|---|
| Y. GRIGORIEV et al., "Kratkii Spravochnik po Teploobmennym Apparatam", 1962, GOSUDARSTVENNOE ENERGETICHESKOE IZDATELSTVO, MOSKVA-LENINGRAD, pages 113, 116. * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1103775A2 (en) * | 1999-11-23 | 2001-05-30 | Heatex B.V. | Heat exchanger and water heating system using same |
| EP1103775A3 (en) * | 1999-11-23 | 2004-04-07 | Soltop Schuppisser AG | Heat exchanger and water heating system using same |
| WO2006074699A1 (en) * | 2004-12-23 | 2006-07-20 | Uli Jakob | Absorption refrigerator |
| WO2015168758A1 (en) * | 2014-05-08 | 2015-11-12 | Ramalho Bernardo Nogueira | Arrangement for a liquid-refrigeration system for use on movable trolleys and the like |
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