US20110174469A1 - Double-pipe heat exchanger - Google Patents
Double-pipe heat exchanger Download PDFInfo
- Publication number
- US20110174469A1 US20110174469A1 US12/987,496 US98749611A US2011174469A1 US 20110174469 A1 US20110174469 A1 US 20110174469A1 US 98749611 A US98749611 A US 98749611A US 2011174469 A1 US2011174469 A1 US 2011174469A1
- Authority
- US
- United States
- Prior art keywords
- heat exchange
- exchange tube
- fluid
- double
- heat exchanger
- 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.)
- Abandoned
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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
- F28D7/10—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
-
- 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
- F28F1/08—Tubular elements crimped or corrugated in longitudinal section
-
- 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
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
- F28F1/424—Means comprising outside portions integral with inside portions
- F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2210/00—Heat exchange conduits
- F28F2210/06—Heat exchange conduits having walls comprising obliquely extending corrugations, e.g. in the form of threads
Definitions
- FIG. 1 is a cross-sectional view of a double-pipe heat exchanger according to an embodiment
- FIG. 3 is a graph showing a relationship between heat transfer performance and a pitch W of a spiral part in a double-pipe heat exchanger according to an embodiment.
- the second heat exchange tube 200 disposed inside the first heat exchange tube 100 may have a spiral part 210 .
- the spiral part 210 may be formed at a surface of the second heat exchange tube 200 so as to be in the form of a screw, and the screw-shaped spiral part 210 may have multiple ridges 212 and grooves 214 .
- the second heat exchange tube may include a cylindrical second fluid inlet port, which may be inserted into or provided at one side of the first heat exchange tube and through which a second fluid may pass; a cylindrical second fluid outlet port, which may be inserted into or provided at the other side of the first heat exchange tube and through which the second fluid may be discharged; and a screw-shaped spiral part continuously formed between the second fluid inlet port and the second fluid outlet port.
- a temperature of a first fluid provided between the first and second heat exchange tubes may be different from that of a second fluid provided in the second heat exchange tube.
- the second fluid provided in the second heat exchange tube may be one of a single-phase fluid or a two-phase fluid.
Abstract
A double-pipe heat exchanger is provided. The double-pipe heat exchanger may include a first heat exchange tube having a first hollow portion, and a second heat exchange tube disposed inside the first heat exchange tube, so as to be co-axial with the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface of the spiral part.
Description
- Pursuant to 35 U.S.C. §119 (a), this application claims priority to Korean Patent Application No. 10-2010-0004010, filed in Korea on Jan. 15, 2010, the contents of which are hereby incorporated by reference in their entirety.
- 1. Field
- A double-pipe heat exchanger is disclosed herein.
- 2. Background
- Heat exchangers are known. However, they suffer from various disadvantages.
- Embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements, wherein:
-
FIG. 1 is a cross-sectional view of a double-pipe heat exchanger according to an embodiment; -
FIG. 2 is an enlarged view of portion A ofFIG. 1 ; and -
FIG. 3 is a graph showing a relationship between heat transfer performance and a pitch W of a spiral part in a double-pipe heat exchanger according to an embodiment. - The advantages, features and aspects will become apparent from the following description of the embodiments with reference to the accompanying drawings, which is set forth hereinafter. The terms and words used in the description below are not limited to typical or dictionary definitions, but can be interpreted with proper meanings and definitions consistent with the technical ideas.
- A heat exchanger is a device that transfers thermal energy from a high temperature fluid to a relatively low temperature fluid, thereby cooling the high temperature fluid and heating the low temperature fluid. The heat exchanger may be used in, for example, a heater, a cooler, an evaporator, or a condenser.
- A heat transfer medium used in the heat exchanger may be classified as a heating medium that transfers heat to a subject or target fluid, and a cooling medium that absorbs heat from the subject or target fluid. The cooling or heating medium may be used in the gaseous or liquid state.
- As one type of heat exchanger, a double-pipe heat exchanger may include an internal tube into which a first fluid is introduced and flows, and an external tube disposed so as to enclose the internal tube and into which a second fluid is introduced and flows. A side wall of the internal tube may be used as a heat transfer wall that performs heat exchange between the first and second fluids.
- In such a double-pipe heat exchanger, a heat transfer surface area between the second fluid and an outer wall of the internal tube may be small, and thus, heat exchange efficiency very low. In order to enhance the heat exchange efficiency, a scale of the heat exchanger or a length of the double pipe may be increased. However, it is difficult to increase the scale of the heat exchanger or the length of the double pipe due to problems of volume.
-
FIG. 1 is a cross-sectional view of a double-pipe heat exchanger according to an embodiment, andFIG. 2 is an enlarged view of portion A ofFIG. 1 . Referring toFIGS. 1 and 2 , a double-pipe heat exchanger 300 according to this embodiment may include a firstheat exchange tube 100 and a secondheat exchange tube 200. - The first
heat exchange tube 100 may be formed in a pipe shape having a firsthollow portion 110. For example, the firstheat exchange tube 100 may have a first diameter D1. - The first
heat exchange tube 100 may include a firstfluid inlet port 120 that communicates with the firstheat exchange tube 100 and a firstfluid outlet port 130 that communicates with the firstheat exchange tube 100. A first fluid may be introduced into and flow through the firstfluid inlet port 120, and may be discharged through the firstfluid outlet port 130 after heat exchange. - In this exemplary embodiment, for example, the first fluid which is introduced through the first
fluid inlet port 120 and is then discharged through the firstfluid outlet port 130 may be a single-phase fluid, for example, cooling water. Further, the first fluid may have a first temperature. - The second
heat exchange tube 200 may be disposed inside the firstheat exchange tube 100, so that the first and secondheat exchange tubes heat exchange tube 200 may have a second diameter D2 smaller than the first diameter D1 of the firstheat exchange tube 100, and thus, a gap G may be formed between the first and secondheat exchange tubes heat exchange tubes heat exchange tube 200 may be about 19.05 mm. - The second
heat exchange tube 200 disposed inside the firstheat exchange tube 100 may have aspiral part 210. Thespiral part 210 may be formed at a surface of the secondheat exchange tube 200 so as to be in the form of a screw, and the screw-shapedspiral part 210 may havemultiple ridges 212 andgrooves 214. - The
spiral part 210 may be formed at both inner and outer surfaces of the secondheat exchange tube 200. Theridges 212 andgrooves 214 of thespiral part 210 may be formed by, for example, a processing roller. - A second
fluid inlet port 202, which may be cylindrical, may be formed at one end of the secondheat exchange tube 200, and a secondfluid outlet port 204, which may be cylindrical, may be formed at the other end thereof. A second fluid may be introduced into and flow through the secondfluid inlet port 202 and may be discharged through the secondfluid outlet port 204 after heat exchange. - In this exemplary embodiment, the second fluid provided in the second
heat exchange tube 200 may be a two-phase fluid. For example, the second fluid may be converted from a liquid state to a gaseous state within the secondheat exchange tube 200. Alternatively, the second fluid provided in the secondheat exchange tube 200 may be a single-phase fluid. - In this exemplary embodiment, the second fluid may have a second temperature that is different from the first temperature of the first fluid. The first temperature of the first fluid may be higher than the second temperature of the second fluid. Alternatively, the first temperature of the first fluid may be lower than the second temperature of the second fluid.
- A pitch W of the
spiral part 210 of the secondheat exchange tube 200 and a height difference Hc between theridges 212 andgrooves 214 formed by thespiral part 210 have a great influence on the heat transfer performance of the first and secondheat exchange tubes spiral part 210 are not optimized, the heat transfer performance may be reduced or deteriorated. -
FIG. 3 is a graph showing a relationship between heat transfer performance and a pitch W of a spiral part in a double-pipe heat exchanger according to an embodiment. The X axis of the graph inFIG. 3 designates the pitch W of thespiral part 210 and the Y axis designates the heat transfer performance. - Referring to
FIG. 3 , as the pitch W of thespiral part 210 gradually increases, the heat transfer performance of the double-pipe heat exchanger 300 inFIG. 1 , in turn, decreases. When the pitch W of thespiral part 210 is about 4˜10 mm, a heat transfer characteristic of the double-pipe heat exchanger 300 is within an allowable range. - However, when the pitch W of the
spiral part 210 of the secondheat exchange tube 200 is less than about 4 mm, the heat transfer characteristic increases, but it is difficult to manufacture and process the pitch W of thespiral part 210. When the pitch W of thespiral part 210 of the secondheat exchange tube 200 is larger than about 10 mm, the heat transfer characteristic decreases. Therefore, the pitch W of thespiral part 210 may be about 4˜10 mm in consideration of working and heat transfer characteristics. - As shown in
FIG. 2 , the height difference Hc between theridges 212 andgrooves 214 of thespiral part 210 of the secondheat transfer pipe 200 may be about 1˜3 mm. When the height difference Hc between theridges 212 andgrooves 214 is less than about 1 mm, heat transfer efficiency decreases remarkably. When the height difference Hc between theridges 212 andgrooves 214 is larger than about 3 mm, the heat transfer efficiency increases, but it is difficult to manufacture and process the pitch W of thespiral part 210. Therefore, the height difference Hc between theridges 212 andgrooves 214 of thespiral part 210 may be about 1˜3 mm in order to satisfy working and heat transfer characteristics. - In order to form the
ridges 212 andgrooves 214 of thespiral part 210 of the secondheat transfer pipe 200, a ratio NW, which is a distance A between a half point W/2 of the pitch W and a top portion P of theridge 212 divided by the pitch W may be less than about 0.15. In this exemplary embodiment, if the second fluid, which is converted from liquid phase to gaseous phase, is provided in the secondheat exchange tube 200, the second fluid may be rotated at a high speed by thespiral part 210 of the secondheat transfer tube 200. At this point, the liquid-phase second fluid having a higher density than the gaseous-phase second fluid may be mainly distributed at an inner side surface of thespiral part 210, and the gaseous-phase second fluid having a relatively low density may be mostly distributed at a center portion of thespiral part 210. - Accordingly, the liquid-phase second fluid and the gaseous-phase second fluid may be separated from each other by a cyclone effect. The liquid-phase second fluid distributed at the inner side surface of the
spiral part 210 may be actively heat-exchanged with the first fluid provided in the firstheat exchange tube 100, and thus, the heat exchange characteristics between the first and second fluids may be further improved. - According to embodiments disclosed herein, the spiral part may be formed on a surface of the second heat exchange tube disposed inside the first heat exchange tube, and the pitch and height of the spiral portion may be optimized, improving considerably the heat transfer efficiency.
- Embodiments disclosed herein provide a double-pipe heat exchanger in which a heat exchange tube disposed at a relatively inner side may be formed in a spiral shape in which ridges and grooves may be continuously formed, thereby increasing a heat transfer performance.
- Further, embodiments disclosed herein provide a double-pipe heat exchanger that may include a first heat exchange tube having a first hollow portion, and a second heat exchange tube disposed inside the first heat exchange tube so as to be co-axial with the first heat exchange tube and having a spiral part in which multiple ridges and grooves may be formed at an inner surface of the spiral part.
- The second heat exchange tube may include a cylindrical second fluid inlet port, which may be inserted into or provided at one side of the first heat exchange tube and through which a second fluid may pass; a cylindrical second fluid outlet port, which may be inserted into or provided at the other side of the first heat exchange tube and through which the second fluid may be discharged; and a screw-shaped spiral part continuously formed between the second fluid inlet port and the second fluid outlet port.
- A ratio A/W of a pitch W that is a length between adjacent grooves of the second heat exchange tube to a distance A between a center portion of the pitch W and a top portion P of the ridge may be less than about approximately 0.15.
- The pitch W may be approximately 4 mm<W<10 mm, and a height difference Hc between the adjacent ridges and grooves may be approximately 1 mm<Hc<3 mm.
- A temperature of a first fluid provided between the first and second heat exchange tubes may be different from that of a second fluid provided in the second heat exchange tube. The second fluid provided in the second heat exchange tube may be one of a single-phase fluid or a two-phase fluid.
- Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
- Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
- The heat exchanger disclosed herein may be used, for example, as a heater, cooler, evaporator and/or condenser in various appliances and devices disclosed in, e.g., U.S. Pat. Nos. 7,793,551, 7,454,921, 7,856,840, 7,726,141, 7,677,681, 7,347,009, 7,721,559, 7,322,199, 6,843,066, 6,735,975, 6,354,095, 7,726,141, 7,540,169, 7,347,009, 7,716,942, and 7,621,138, whose entire disclosures are incorporated herein by reference.
Claims (18)
1. A double-pipe heat exchanger, comprising:
a first heat exchange tube having a first hollow portion; and
a second heat exchange tube disposed inside the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface thereof.
2. The double-pipe heat exchanger of claim 1 , wherein the second heat exchange tube is disposed inside the heat exchange tube so as to be co-axial with the first heat exchange tube.
3. The double-pipe heat exchanger of claim 1 , wherein the first heat exchange tube comprises:
a first fluid inlet port through which a first fluid is introduced into the first heat exchange tube; and
a first fluid outlet port through which the first fluid is discharged from the first heat exchange tube.
4. The double-pipe heat exchanger of claim 1 , wherein the second heat exchange tube comprises:
a second fluid inlet port through which a second fluid is introduced into the second heat exchange tube;
a second fluid outlet port through which the second fluid is discharged from the second heat exchange tube; and
the spiral part which extends between the second fluid inlet port and the second fluid outlet port.
5. The double-pipe heat exchanger of claim 4 , wherein the second fluid inlet port extends through a first side wall of the first heat exchange tube, and the second fluid outlet port extends through a second side wall of the heat exchange tube.
6. The double-pipe heat exchanger of claim 5 , wherein the second side wall is opposite the first side wall.
7. The double-pipe heat exchanger of claim 4 , wherein the second fluid inlet pipe and second fluid outlet pipe are cylindrical.
8. The double-pipe heat exchanger of claim 1 , wherein a ratio A/W of a pitch W, which is a length between adjacent grooves of the second heat exchange tube, to a distance A between a center portion of the pitch W and a top portion P of the ridge is less than about 0.15.
9. The double-pipe heat exchanger of claim 1 , wherein the pitch W is approximately 4 mm<W<10 mm, and a height difference Hc between an adjacent ridge and groove is approximately 1 mm<Hc<3 mm.
10. The double-pipe heat exchanger of claim 1 , wherein a temperature of a first fluid provided between the first and second heat exchange tubes is different from a temperature of a second fluid provided in the second heat exchange tube.
11. The double-pipe heat exchanger of claim 5 , wherein the second fluid is one of a single-phase fluid or a two-phase fluid.
12. A heater comprising the double-pipe heat exchanger of claim 1 .
13. A cooler comprising the double-pipe heat exchanger of claim 1 .
14. An evaporator comprising the double-pipe heat exchanger of claim 1 .
15. A condenser comprising the double-pipe heat exchanger of claim 1 .
16. A double-pipe heat exchanger, comprising:
a first heat exchange tube having a first hollow portion; and
a second heat exchange tube disposed inside the first heat exchange tube so as to be coaxial with the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface thereof, wherein the second heat exchange tube comprises:
a second fluid inlet port the second heat exchange tube through which a second fluid is introduced into the second heat exchange tube;
a second fluid outlet port through which the second fluid is discharged from the second heat exchange tube; and
the spiral part which extends between the second fluid inlet port and the second fluid outlet port.
17. The double-pipe heat exchanger of claim 16 , wherein the second fluid inlet port extends through a first side wall of the first heat exchange tube, and the second fluid outlet port extends through a second side wall of the heat exchange tube.
18. A double-pipe heat exchanger, comprising:
a first heat exchange tube having a first hollow portion; and
a second heat exchange tube disposed inside the first heat exchange tube so as to be coaxial with the first heat exchange tube and having a spiral part in which multiple ridges and grooves are formed at an inner surface thereof, wherein the pitch W, which is a length between adjacent grooves of the second heat exchange tube, is approximately 4 mm<W<10 mm, and a height difference Hc between an adjacent ridge and groove is approximately 1 mm<Hc<3 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100004010A KR101620106B1 (en) | 2010-01-15 | 2010-01-15 | Double-piped heat exchanger |
KR10-2010-0004010 | 2010-01-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110174469A1 true US20110174469A1 (en) | 2011-07-21 |
Family
ID=43859119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/987,496 Abandoned US20110174469A1 (en) | 2010-01-15 | 2011-01-10 | Double-pipe heat exchanger |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110174469A1 (en) |
EP (1) | EP2354743A3 (en) |
KR (1) | KR101620106B1 (en) |
CN (1) | CN102128554A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20130312441A1 (en) * | 2012-05-25 | 2013-11-28 | Hussmann Corporation | Heat exchanger with integrated subcooler |
JP2016033440A (en) * | 2014-07-31 | 2016-03-10 | 株式会社コベルコ マテリアル銅管 | Heat transfer pipe for pipe single phase flow |
EP3097377A1 (en) * | 2014-01-20 | 2016-11-30 | Neotiss SAS | Improved tube for a heat exchanger |
US11221182B2 (en) * | 2018-07-31 | 2022-01-11 | Applied Materials, Inc. | Apparatus with multistaged cooling |
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CN102368024A (en) * | 2011-09-19 | 2012-03-07 | 福兴织造(苏州)有限公司 | Residual heat recovery device for textile mills |
KR101354814B1 (en) * | 2011-12-14 | 2014-01-27 | 삼성전기주식회사 | Semiconductor package |
WO2014006151A1 (en) * | 2012-07-05 | 2014-01-09 | Tetra Laval Holdings & Finance S.A. | An improved tubular heat exchanger |
CN102831941B (en) * | 2012-06-11 | 2015-04-15 | 华北电力大学 | 0-shaped lead-bismuth heat exchange device |
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CN107238308A (en) * | 2017-07-25 | 2017-10-10 | 陕西路圣里德太阳能研究院有限公司 | Heat conduction profit finned tube set of heat exchange tubes and energy storage device |
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CN108225057A (en) * | 2018-02-11 | 2018-06-29 | 佛山科学技术学院 | A kind of concave surface heat exchanger tube double pipe heat exchanger |
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- 2011-01-10 EP EP11150467A patent/EP2354743A3/en not_active Withdrawn
- 2011-01-10 US US12/987,496 patent/US20110174469A1/en not_active Abandoned
- 2011-01-17 CN CN2011100224865A patent/CN102128554A/en active Pending
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US1611299A (en) * | 1925-09-03 | 1926-12-21 | Zona E Wilka | Combined vaporizer and air-inlet device |
US3779312A (en) * | 1972-03-07 | 1973-12-18 | Universal Oil Prod Co | Internally ridged heat transfer tube |
US5655599A (en) * | 1995-06-21 | 1997-08-12 | Gas Research Institute | Radiant tubes having internal fins |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130312441A1 (en) * | 2012-05-25 | 2013-11-28 | Hussmann Corporation | Heat exchanger with integrated subcooler |
US10132538B2 (en) * | 2012-05-25 | 2018-11-20 | Hussmann Corporation | Heat exchanger with integrated subcooler |
EP3097377A1 (en) * | 2014-01-20 | 2016-11-30 | Neotiss SAS | Improved tube for a heat exchanger |
EP3097377B1 (en) * | 2014-01-20 | 2022-04-20 | Neotiss SAS | Improved tube for a heat exchanger |
JP2016033440A (en) * | 2014-07-31 | 2016-03-10 | 株式会社コベルコ マテリアル銅管 | Heat transfer pipe for pipe single phase flow |
US11221182B2 (en) * | 2018-07-31 | 2022-01-11 | Applied Materials, Inc. | Apparatus with multistaged cooling |
Also Published As
Publication number | Publication date |
---|---|
EP2354743A2 (en) | 2011-08-10 |
KR20110083996A (en) | 2011-07-21 |
KR101620106B1 (en) | 2016-05-13 |
CN102128554A (en) | 2011-07-20 |
EP2354743A3 (en) | 2012-10-31 |
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AS | Assignment |
Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, HONGSEONG;LEE, SANGYEUL;SA, YONGCHEOL;AND OTHERS;REEL/FRAME:025610/0214 Effective date: 20110103 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |