HEAT TRANSFER SYSTEM

Abstract

The present disclosure relates to a heat transfer system 1 for transferring heat between a first fluid and a second fluid. The system 1 has an arrangement 2 composed of pipe elements 3, 3a, 3b, 3c for passing through the first fluid, one or more pipe bottoms 5 having a through opening 6, and one or more sealing elements 7 having a through opening 8. The pipe elements 3, 3a, 3b, 3c are formed of a flat pipe having a first region 10 having a first height X and a width W and one or more second regions 11 having a support surface 13 arranged on one end portion of the pipe elements 3, 3a, 3b, 3c and having a second height Y, respectively. The sealing element 7 is arranged between the edge of the through-hole 6 of the pipe bottom 5 and the support surface 13, respectively, and has a specific wall thickness G. The pipe elements 3, 3a, 3b, 3c having a wide side are arranged in a state aligned parallel to each other and at an interval F with respect to each other in the first region 10. A web 5-1 having a height H is provided between the through openings 6 arranged adjacent to each other of the pipe bottom 5. The deformation degree of the end portion of the pipe elements 3, 3a, 3b, 3c in the height direction c, which is placed in a range from the maximum value CM.sub.max to the minimum value CM.sub.min, is previously set with reference to the dimension relationship.

Claims

1. A heat transfer system 1, as the system for transferring heat between a first fluid and a second fluid, which has an arrangement composed of pipe elements for passing through the first fluid, one or more pipe bottoms having a through opening, and one or more sealing elements having a through opening, wherein the pipe elements are formed of a flat pipe having a first region having a first height X and a depth W and one or more second regions having a support surface arranged on one end portion of the pipe elements and having a second height Y, respectively, wherein the sealing element is arranged between the edge of the through opening of the pipe bottom, and having a wall thickness G, respectively, wherein the pipe elements having a wide side are aligned in a state aligned parallel to each other and at an interval F with respect to each other in the first region, respectively, wherein a web having a height H is provided between the through openings arranged adjacent to each other of the pipe bottom, respectively, wherein when viewing in a height direction c, an extension part inside the first region of the pipe elements appeared from a value obtained by adding a first height X of the pipe elements to the interval F corresponds to an extension part inside the second region of the pipe elements appeared from a value obtained by adding a second height Y of the pipe elements to the height H of the web of the pipe bottom and two times the wall thickness G of the sealing element, and wherein CM=F−H=Y−X+2.Math.G, the CM in the equation refers to the deformation degree of the end portion of the pipe elements in the height direction c, is placed within a range between the maximum value CM.sub.max and the minimum value CM.sub.min, and the CM.sub.min appears as CM.sub.min=2.Math.G when the heights X, Y of the pipe elements are the same.

2. The heat transfer system of claim 1, wherein the pipe elements 3, 3a, 3b, 3c are made of metal.

3. The heat transfer system of claim 1, wherein the lateral cross sections of the pipe elements are expanded within the second region on the plane aligned vertically with respect to a vertical direction a of the pipe elements.

4. The heat transfer system of claim 1, wherein the flow lateral cross sections of the pipe elements are limited by two side surfaces disposed to face each other, respectively, and the side surface forms the narrow side or the vertical side of the flow lateral cross section in pair, respectively.

5. The heat transfer system of claim 4, wherein the side surfaces of the pipe elements arranged adjacent to each other are aligned vertically with respect to each other at the contact edges proceeding in the vertical direction a, and the contact edges have a transition part round-processed having an edge radius R, respectively.

6. The heat transfer system of claim 5, wherein the first height X of the first region of the pipe elements is greater than a value of two times the edge radius R of the pipe elements, and the maximum value CM.sub.max is appeared from the following equation, CM.sub.max=[(2πR+2(W−2R)+2(X−2R))A/π]−X+2G, and the A in the equation corresponds to the expansion capacity of the pipe.

7. The heat transfer system of claim 4, wherein the side surfaces arranged at the vertical side of the flow lateral cross section of the pipe elements, respectively, are connected to each other through the side surface of the narrow side bent outwards in the semicircle hollow cylinder shape and having the outer radius R.

8. The heat transfer system of claim 7, wherein the first height X of the first region of the pipe elements corresponds to two times the radius R of the side surface of the narrow side of the pipe elements bent outwards in the semicircle hollow cylinder shape, and the maximum value CM.sub.max is appeared from the following equation, CM.sub.max=[(Xπ+2(W−X))A/π]−X+2G, and the A in the equation corresponds to the expansion capacity of the pipe.

9. The heat transfer system of claim 2, wherein the pipe elements have the wall thickness of 0.22 mm, the first height X of about 2.5 mm, and the width W of about 10.8 mm in the first region, and have the second height Y of about 4.69 mm and the width of about 10.95 mm in the second region.

10. The heat transfer system of claim 2, wherein the pipe elements on the end portion of the pipe are formed in a state expanded starting from the front in the region of an apex of the vertical side, respectively, and the wall of the pipe elements are deformed to have a molding part outwards in the height direction c, respectively.

11. The heat transfer system of claim 10, wherein the pipe elements have an extension part Z of about 7.6 mm in the maximally expanded region of the molding part in the height direction c.

12. The heat transfer system of claim 1, wherein the pipe bottom has a ring element for at least locally reducing the opened lateral cross section of the through opening for receiving the sealing element and the pipe elements in the region of the web.

13. The heat transfer system of claim 1, wherein the bottom area is formed as the sidewall element of a collector of the system.

14. The heat transfer system of claim 13, wherein two pipe bottoms having the through opening and two sealing elements having the through opening are formed, the pipe bottom is connected with the pipe elements in the fluid sealing method, respectively, the through openings coincide with the outer shape of the pipe elements in the shape, respectively, and the respective pipe elements are arranged to have a first end portion passing through the through opening formed on a first pipe bottom and a second end portion passing through the through opening formed on a second pipe bottom, respectively.

15. The heat transfer system of claim 2, wherein the pipe elements are made of an aluminum alloy.

16. The heat transfer system of claim 1, wherein the pipe elements of one column of the system aligned side by side and parallel to each other, and to have a wide side with respect to each other are arranged so that the flow path for the second fluid is directly formed one by one between the pipe elements arranged adjacent to each other, respectively.

17. The heat transfer system of claim 16, wherein a multi-disc or a rib for changing the flow lateral cross section and/or expanding a heat transfer area within the flow path formed inside the first region by the pipe elements arranged adjacent to each other, the multi-disc has an extension part in the height direction c, and the extension part corresponds to the interval F of the pipe elements arranged adjacent to each other.

18. The heat transfer system of claim 17, wherein the multi-disc or the rib is made of an aluminum alloy.

19. A method comprising operating using the heat transfer system of claim 1 as a coolant-air-heat exchanger within a coolant circulation system.

20. A method according to claim 19, wherein the coolant circulation system is an engine coolant circulation system of a vehicle.

Description

DESCRIPTION OF DRAWINGS

[0050] Additional specific items, features and advantages of the embodiments of the present disclosure will be appeared from the following detailed descriptions for the embodiments of the present disclosure with reference to the relevant drawings. Herein,

[0051] FIG. 1 is an exploded diagram specifically showing a heat transfer system having a pipe element arrangement including a multi-disc intermediate-supported, a pipe bottom, a sealing element, and a collector as an individual component.

[0052] FIG. 2A is a side diagram showing the pipe element having a first region and a second region to be formed of a flat pipe.

[0053] FIGS. 2B and 2D are perspective diagrams showing the pipe element having different flow lateral cross sections, respectively, and formed of the flat pipe.

[0054] FIG. 2C is a diagram specifically showing the pipe element shown in FIG. 2B.

[0055] FIG. 3A is a side diagram specifically showing the arrangement of the pipe element having the multi-disc intermediate-supported of the heat transfer system shown in FIG. 1.

[0056] FIG. 3B is a side cross-sectional diagram specifically showing the arrangement of the pipe element having the multi-disc intermediate-supported, the pipe bottom, and the sealing element of the heat transfer system shown in FIG. 1.

[0057] FIG. 3C is a diagram specifically showing the pipe bottom having the sealing element shown in FIG. 3B.

[0058] FIGS. 4A and 4B are a perspective diagram and a plane diagram showing the pipe element partially enlarged on the end portion of the pipe, and having the elliptical lateral cross section similar to the pipe element shown in FIG. 2A.

[0059] FIGS. 4C to 4F are a perspective diagram and a plane diagram showing the pipe element finally enlarged on the end portion of the pipe shown in FIGS. 4A and 4B.

[0060] FIGS. 5A and 5B are a perspective diagram and a plane diagram showing the pipe element having partially enlarged on the end portion of the pipe, and having the elliptical lateral cross section similar to the pipe element shown in FIG. 4A.

[0061] FIG. 6A is a side cross-sectional diagram specifically showing the arrangement of the pipe element shown in FIG. 5A within a through opening of the pipe bottom having the sealing element.

[0062] FIG. 6B is a diagram specifically showing the pipe bottom having the sealing element and the pipe element shown in FIG. 6A.

BEST MODE

[0063] FIG. 1 shows a pipe element 3 having a pipe bottom 5 and a sealing element 7 of a heat transfer system 1, particularly, an arrangement 2 of a flat pipe. In this drawing, the heat transfer system 1 having the arrangement 2 including a pipe element 3 having a multi-disc 4 intermediate-supported, the pipe bottom 5, the sealing element 7, and a collector 9 is specifically shown. The collector 9 is also called as a coolant collector when coolant is used as fluid.

[0064] The arrangement 2 formed of the flat pipe 3 is formed in one column or a plurality of columns according to the output demand condition, and is adjustable in terms of size, that is, in terms of the length or the width, particularly. The pipe element 3 is arranged in two columns.

[0065] The pipe element 3 aligned side by side and parallel to each other is aligned with respect to each other inside one column having a wide side, such that the flow path for fluid, particularly, the air, is directly generated between the pipe elements 3 adjacent to each other, respectively. At this time, the flow path proceeds between the pipe elements 3, respectively. The pipe elements 3 of one column are arranged in the same line with respect to each other, and extended between two collectors 9, respectively. The inner volume of the pipe element 3 is connected with the inner volume of the collector 9.

[0066] Within the flow path and the intermediate space of the pipe element 3 arranged adjacent to each other, an element for changing the flow lateral cross section and/or expanding the heat transfer area is formed. As the element for changing the flow lateral cross section and/or expanding the heat transfer area, the multi-disc 4 is provided. Alternatively, a rib can also be used. The multi-disc 4 is preferably formed in a material having the excellent heat conductivity such as an aluminum alloy like the pipe element 3.

[0067] In a state where the system 1 has been assembled, the pipe bottom 5, which can be used even as the sidewall element of the collector 9 is provided at the front or the narrow side of the arrangement 2, respectively. In this case, the side surface on which the end portion of the pipe element 3 has been aligned is called as a front. The pipe bottom 5 is made of metal, particularly, an aluminum alloy, respectively, as a deep drawing part, a perforation part or a hydrofoaming part, which are substantially the form of the rectangular-shaped sheet. In this case, the sheet is understood as a flat final product of a rolling mill made of metal. The hydrofoaming also called as high-pressure deformation is regarded as deforming the sheet within the closed mold tool by using the pressure generated within the tool by the water-oil-emulsion.

[0068] The sealing element 7 as well as the pipe bottom 5 on which the edge region has been round-processed also has the through openings 6, 8 for receiving the pipe element 3. In order to make the fluid sealing connection between the individual pipe element 3 and the pipe bottom 5, the through opening 6 of the pipe bottom 5 and the through opening 8 of the sealing element 7 are matched to each other, and also matched with the outer dimension of the pipe element 3. A web 5-1 is formed between the through openings 6 of the pipe bottom 5, respectively.

[0069] The pipe bottom 5 arranged at the side facing each other of the collector 9 is fixedly connected with the pipe element 3. The fixing connection can be regarded as the zero-leakage technically sealed by the sealing element 7, respectively. The pipe bottom 5 is aligned vertically with respect to the pipe element 3 at the narrow side of the pipe element 3 to be arranged on the arrangement 2.

[0070] FIG. 2A is a side diagram showing the pipe element 3 formed of the flat pipe having a first region 10 not deformed as a heat transfer region, a second region 11 not deformed as a deformation region, and a connection part with the pipe bottom 5. The regions 10, 11 of the pipe element are formed in a state connected to each other when viewing in the vertical direction a.

[0071] The pipe element 3 is expanded and deformed at least partially on the end portion of the pipe. The lateral cross section of a flow channel surrounded by the wall of the pipe element 3 is expanded constantly and uniformly between the first region 10 circulated by the fluid and the second region 11 facing the end portion side of the pipe. The cross-sectional area of the flow channel is constant inside the regions 10, 11, respectively. The second region 11 of the pipe element 3 is preferably used as a support surface for the sealing element 7 formed flatly, that is, without a structure such as a notch or a groove, respectively.

[0072] The pipe element 3 has an outer extension part X also called as the height X of the first region 10 when viewing in the height direction c within the first region 10 not deformed. The second region 11 of the pipe element 3, which has been expanded at least partially, is formed by an outer extension part Y also called as the height Y of the second region 11 when viewing in the height direction c. The width of the pipe element 3 is extended in the depth direction b, respectively.

[0073] In FIGS. 2B and 2D, perspective diagrams showing the pipe elements 3a, 3b having different flow lateral cross sections and formed of the flat pipe are shown, respectively. In these drawings, one end surface of the first region 10 not deformed of the pipe elements 3a, 3b are shown, respectively. The flow lateral cross section is extended within the plane set by the depth direction b and the height direction c.

[0074] The flow lateral cross-sections are limited by two side surfaces placed to face each other, respectively, and these side surfaces form the narrow side or the vertical side of the flow lateral cross section, respectively. The side surfaces formed to face each other in pair have the same dimension, respectively. In this case, the side surfaces of the narrow side as a first pair in the height direction c have the same height X, while the side surfaces of the vertical side as a second pair in the depth direction b aligned parallel to each other have the same width W.

[0075] A substantial difference between FIGS. 3A and 3B is the dimension of the height X, the shape of the transition part between the side surfaces adjacent to each other or the shape of the side surface of the narrow side.

[0076] A pipe element 3a of FIG. 2B is formed to have the transition part round-processed on the side surface aligned vertically with respect to each other. The transition part has the edge radius R, and this situation is particularly shown in the diagram specifically showing the pipe element 3a of FIG. 2C.

[0077] The side surfaces arranged, respectively, at the vertical side of the flow cross section of a pipe element 3b shown in FIG. 2D is connected to each other through the side surface of the semicircle hollow cylinder shape of the narrow side, respectively. In this case, the outer radius R of the side surface corresponds to a half of the height X.

[0078] FIGS. 3A and 3B are diagrams specifically showing the arrangement 2 of the pipe element 3 having the multi-disc 4 intermediate-supported of the heat transfer system 1 shown in FIG. 1. In this case, FIG. 3A shows a side diagram, while in FIG. 3B, a diagram specifically showing the arrangement 2 shown in FIG. 3A is shown as a side cross-sectional diagram in a state expanded by the pipe bottom 5 and the sealing element 7.

[0079] The pipe element 3 is formed by the height X in the first region 10, respectively, and by the height Y in the second region 11, respectively, and in this case, the extension part of the pipe element 3 is smaller within the first region 10 than within the second region 11 when viewing in the height direction c. The pipe element 3 is uniformly expanded to the circumference of the central axis aligned in the vertical direction a within the second region 11.

[0080] Within the intermediate space inside the first region 10 having a wide side and formed within the pipe element 3 aligned side by side and parallel to each other, the multi-disc 4 is provided as the element for changing the flow lateral cross section and/or expanding the heat transfer area. The multi-disc 4 connected with the pipe element 3, respectively, at the wide side of the pipe element 3 arranged adjacent to each other completely fills the intermediate space between the pipe elements 3, such that the interval F of the pipe element 3 arranged adjacent to each other also corresponds to the height F of the multi-disc 4 when viewing in the height direction c. In this case, the multi-disc 4 is formed only within the first region 10 of the pipe element 3.

[0081] The pipe element 3 has the second region 11, respectively, and is arranged within the through openings 6, 8 of the sealing element 7 and the pipe bottom 5. The web 5-1 is formed between the through opening 6 of the pipe bottom 5 arranged adjacent to each other in the height direction c, and this web limits the through opening 6 in the depth direction b, respectively, and substantially contacts the wide side of the pipe element 3 in a state connected with the sealing element 7. In FIG. 3C, a diagram specifically showing the web 5-1 of the pipe bottom 5 having the sealing element 7 shown in FIG. 3B is shown.

[0082] Within the intermediate space inside the second region 11 having a wide side and formed within the pipe element 3 aligned side by side and parallel to each other, the web 5-1 of the pipe bottom 5 and the sealing part 7 are arranged. Therefore, the intermediate space between the pipe elements 3 arranged adjacent to each other when viewing the height direction c is completely filled by one web 5-1 and two sections of the sealing part 7. When viewing in the height direction c, the web 5-1 is formed at the height H, while the two sections of the sealing element 7 have the wall thickness G, respectively.

[0083] In the first region 10 of the pipe element 3, the extension part of an unit composed of the pipe element 3 and the multi-disc 4 is appeared from a value obtained by adding the height X of the pipe element 3 to the height F of the multi-disc 4 in the height direction c. In addition, in the second region 11 of the pipe element 3, the extension part of an unit composed of the pipe element 3, the sealing element 7, and the web 5-1 of the pipe bottom 5 is appeared from a value obtained by adding the height Y of the pipe element 3 to the height H of the web 5-1 and two times the wall thickness G of the sealing part, and this situation induces the following equation.

X+F=Y+H+2.Math.G  Equation 1

[0084] After conversion of Equation 1, the following equation is appeared as

CM=F−H=Y−X+2.Math.G  Equation 2

[0085] The CM in the equation refers to the optimum range of the difference between the height H of the web 5-1 of the pipe bottom 5 as the extension part in the height direction c formed between the adjacent through openings 6 of the pipe bottom 5 and the height F of the multi-disc 4, and the deformation degree of the end portion of the pipe element 3 in the height direction c.

CM.sub.max≥CM≥CM.sub.min  Equation 3

[0086] The equations describe the optimum relationship between the structure of the pipe element 3 referring to the radius R, the width X, and the height X of the first region 10 and the deformation of the pipe element 3 at the end portion thereof referring to the height Y of the second region 11, the height F of the multi-disc 4, the height H of the web 5-1 between the through openings 6 of the pipe bottom 5, and the wall thickness G of the sealing element 7. In this case, particularly, referring to the following Equations 4 to 6, a range between the maximum value CM.sub.max at which the deformation of the end portion of the pipe of the pipe element 3 induces the circular flow lateral cross section and the minimum value CM.sub.min at which the end portion of the pipe of the pipe element 3 is not deformed is indicated.

[0087] According to FIGS. 2B and 2C in which the side surface is aligned vertically with respect to each other, and the transition part between the side surfaces adjacent to each other has been round-processed, when the height X of the first region 10 is greater than a value of two times the edge radius R of the pipe element 3a (X>2.Math.R), the maximum value CM.sub.max is appeared as follows.

CM.sub.max=[(2πR+2(W−2R)+2(X−2R))A/π]−X+2G  Equation 4

[0088] According to FIG. 2D that has the side surface of the vertical side connected to each other through the side surface of the semicircle cylinder shape of the narrow side, respectively, when the height X of the first region 10 coincides with two times the radius R of the pipe element 3b (X=2.Math.R), the maximum value CM.sub.max is appeared as follow.

CM.sub.max=[(Xπ+2(W−X))A/π]−X+2G  Equation 5

[0089] The pipe element 3 is not expanded from the end portion of the pipe, not changed in shape, or not deformed, such that the height Y of the second region 11 coincides with the height X of the first region 10 of the pipe elements 3, 3a, 3b (Y=X) to determine the minimum limitation CM.sub.min. Therefore, the minimum value CM.sub.min is always appeared from two times the wall thickness G of the sealing element 7 as follows.

CM.sub.min=2.Math.G  Equation 6

[0090] The parameter A describes the expansion capacity of the pipe as a ratio of the circumference of the pipe element at the end portion of the pipe after deformation to the circumference of the pipe element at the end portion of the pipe before deformation.

[0091] FIGS. 4A and 4B are a perspective diagram and a plane diagram showing the pipe element 3 expanded at least partially from the end portion of the pipe similar to the pipe element 3a shown in FIG. 2A or FIGS. 2B and 2C, respectively. The pipe element 3 is deformed and expanded in the region of the end portion of the pipe, such that the flow channel limited by the wall of the pipe element 3 has been substantially deformed from the rectangular lateral cross-sectional shape into the elliptical lateral cross-sectional shape. The elliptical lateral cross-sectional shape of the flow channel is very stable against the outer pressure, and particularly, is very stable against the pressure provided by the compressed sealing element 7.

[0092] In this case, the pipe element 3 not deformed has been formed at the wall thickness of 0.22 mm, the width W of about 10.8 mm, and the height X of 2.5 mm. The pipe element 3 expanded at least partially has the height of about 4.69 mm when the width is about 10.95 mm in the second region 11, for example, in the region of the maximum extension part Y. The second region 11 is formed as the support surface 13 having the indicated dimension, and the support surface contacts the wall of the pipe element 3 on the pipe bottom 5 or on the sealing element 7 compressed between the pipe element 3 and the pipe bottom 5.

[0093] In order to withstand the resistance of the compressed sealing element 7, the pipe element 3 is finally expanded in the region of an apex 12. In this case, in order to further increase the rigidity of the support surface 13 with respect to the sealing element 7, the wall of the pipe element 3 is deformed outwards from the vertical side. In a state finally deformed, particularly, the structure of the wall of the pipe element 3 is reinforced at the vertical side.

[0094] FIGS. 4C to 4F are a perspective diagram and a plane diagram showing the pipe element 3 finally expanded from the end portion of the pipe. According to FIGS. 4A and 4B, after the pipe element 3 has been expanded at least partially, the pipe element 3 is finally expanded starting from the front in the already deformed region of the end portion of the pipe, respectively. In this case, particularly, the edges of the upper surface and the lower surface are deformed outwards in the height direction c, respectively. By using a perforation blade, the apex 12 of the pipe element 3 is expanded with respect to the sealing element 7 in the second region 11, and the compression of the sealing element 7 is increased. After the blade has been removed, the flexible material of the pipe is minimally restored in shape in the direction of the starting position, and in this case, the compression of the sealing material 7 is kept within a predetermined range as it is. Finally, the pipe element 3 has a molding part 14 in the region of the apex 12 of the upper surface and the lower surface, respectively.

[0095] The wall of the pipe element 3 deformed on the end portion of the pipe is formed continuously and without crack by the molding part 14. On the other hand, the shape of the molding part 14 is used to increase the structural rigidity of the wall of the pipe element 3, and on the another hand, is used for fixing and sealing inside the through opening 6 within the pipe bottom 5. In this case, a change in relative position of the pipe element 3 with respect to the pipe bottom 5 and in addition, a fixing force of avoiding the movement of the pipe element 3 inside the pipe bottom 5 are also increased.

[0096] The pipe element 3 finally expanded now has an extension part Z of about 7.6 mm in the maximally expanded region of the molding part 14, for example.

[0097] The system 1 formed to have the pipe element 3 also has a very high thermal shock-durability due to the pipe element-sealing element-pipe bottom-connection, which is flexible and not rigid, formed on one or more side surfaces of the arrangement 2.

[0098] FIGS. 5A and 5B are a perspective diagram showing the pipe element 3 having the elliptical lateral cross section similar to the pipe element shown in FIG. 4A and a plane diagram in the operating direction of the pressure 15 provided from the outside. The pressure is generated by the sealing element contacting through the entire range, which is not shown in the drawing.

[0099] In this case, when viewing on the lateral cross section, the surface of the arc shape of the narrow side of the deformed end portion of the pipe element 3 has a diameter smaller than the end portion of the pipe element 3 shown in FIG. 4A. The wall of the pipe element 3c has been formed to have a thicker lateral cross section formed in the elliptical shape, which withstands the pressure provided from the outside more excellently.

[0100] The pipe element 3 can also be formed by a combination of the structural features such as the elliptical shape of the lateral cross section on the end portion of the pipe according to FIG. 5A and the deformation of the end portion of the pipe having the molding part 14 in the region of the apex 12 of the upper surface and the lower surface according to FIGS. 4C to 4F.

[0101] FIG. 6A is a side cross-sectional diagram specifically showing the arrangement of the pipe element 3 within the through opening 6 of the pipe bottom 5 having the sealing element 7. FIG. 6B is a diagram specifically showing the pipe bottom 5 having the sealing element 7 and the pipe element 3 shown in FIG. 6A.

[0102] FIG. 6A particularly shows the arrangement of the deformed and expanded pipe element 3 preferably having the elliptical lateral cross section arranged by passing through the through opening formed within the pipe bottom 5 and the sealing element 7. Due to the expansion of the pipe element 3, the pipe element 3 is firmly connected with the sealing element 7 arranged between the pipe element 3 and the edge of the through opening of the pipe element 3, and connected with the pipe bottom 5 in the fluid sealing method.

[0103] The pipe bottom 5 is formed to have a ring element 17 in a region 16 of the web 5-1, respectively, and this ring element at least locally reduces the opened lateral cross section of the through opening 6 for receiving the sealing element 7 and the pipe element 3. The ring element 17 is formed so that the compression of the sealing element 7, in which the sealing element 7 is additionally compressed on a predetermined section or a predetermined surface, such that otherwise, the compression is less particularly in the region of the apex of the pipe element 3, increases as intended. However, since the compression is stronger only in a region where the sealing element 7 is small, the final force acting on the wall of the pipe is smaller, and the wall of the pipe is not collapsed.

[0104] Particularly, in order to reach the efficient compression of the sealing element 7 through the entire circumference in the region 16 of the apex 12 again, the system 1 can be formed by any combination of the structural features of the pipe element 3 such as the elliptical shape of the lateral cross section on the end portion of the pipe according to FIG. 5A and the deformation of the end portion of the pipe having the molding part 14 in the region of the apex 12 of the upper surface and the lower surface according to FIGS. 4C to 4F, and by providing the ring element 17 in the region of the web 5-1 of the pipe bottom 5.

[0105] The connection between the pipe bottom 5 and the pipe element 3 is secured so that the pipe element 3 is arranged at the accurate position of the through openings 6, 8 and therefore, so that the reliable connection part of the fluid sealing method is generated. In order to secure the sufficient and reliable compression of the sealing element 7, the intended size of the expansion is previously determined as a final extension part of the pipe element 3. At this time, the compression of the sealing element 7 is placed within a range of 10% to 50%, and in this case, the compression is mostly achieved immediately after mounting the sealing element 7 and the pipe bottom 5 on the pipe element 3.

INDUSTRIAL APPLICABILITY

[0106] The present disclosure particularly relates to the heat transfer system for using in the vehicle. In this system, heat is preferably transferred between coolant as the first fluid, for example, water or water-glycol-mixture and the air as the second fluid. This system has an assembly composed of a pipe element for passing through the first fluid, and one or more pipe bottoms and one or more sealing elements having a through opening for passing through the pipe element, respectively.