DE102017105265A1 - Heat exchanger tube and heat exchanger assembly - Google Patents

Abstract

The invention relates to a heat exchanger tube (1) for a heat exchanger assembly (130), which is adapted to conduct a heat transfer medium, in particular a heat transfer fluid, and which has a limited by a pipe wall flow cross section for the heat transfer medium, wherein the pipe wall (2). a longitudinally extending flattened tube wall region (4) for application to a sheet (120). The remaining pipe wall regions (14 '), which are not designed to be applied to a sheet (120), have an asymmetrical pipe wall profile relative to the pipe cross-section. Furthermore, the invention relates to a domestic appliance (100), in particular a heat pump, and a method for producing a heat exchanger tube (1).

Description

The invention relates to a heat exchanger tube for a heat exchanger assembly, which is adapted to direct a heat transfer medium, in particular a heat transfer fluid, and which has a limited by a pipe wall flow cross-section for the heat transfer medium, wherein the tube wall extending in the longitudinal direction flattened pipe wall region for application to a sheet. Furthermore, the invention also relates to a heat exchanger assembly for a domestic appliance with at least one heat transfer medium leading pipeline and a home automation device, in particular a heat pump, with a heat exchanger assembly and a method for producing a heat exchanger tube for conducting a heat transfer medium.

Domestic appliances include all belonging to the building services equipment, such as heat pumps, ventilation systems, water heaters such as hot water tank and water heater.

In order to transfer heat between a heat transfer medium carried in a pipeline, e.g. a fluid, and a solid body, such as a plate-shaped sheet, the pipe is brought into contact with its outer wall with the solid body. Essentially, two fundamental physical effects are to be taken into account in heat transfer. On the one hand, the heat transfer is all the more effective, the larger the contact area or the contact area between the pipeline and the solid body. On the other hand, the rougher pipe losses occurring in the pipeline are all the lower, the rounder the tube is in cross-section. Both physical effects are a bit far in contrast to each other, since a flow-optimal round tube is in direct contact with a solid body only over a very narrow tube wall area, whereby the heat transfer is reduced to a minimum.

The heat transfer is used among other things in the field of domestic appliances, such as heat pumps to cool parts of equipment. In particular, it may be necessary on a control device of a building services appliance, in which power electronics with a converter are used, to remove the heat generated during the transformation of the electrical energy in a controlled manner.

In order to increase the heat transfer area between a pipeline and a solid body, the pipeline is changed in cross-section so that it has a D-shape instead of a circular diameter. In this case, a flattened tube wall region is formed on the pipeline via a pipeline section.

Out DE 10 2010 018 162 B3 a surface heat transfer element is known, which has a Rohrmäander, wherein the substantially mutually parallel pipe sections have a D-shaped cross-section. In the manufacture of such a D-shaped tube, there are sometimes difficulties, since during the forming of the usually used cylindrical tube as a starting product, on the flattened side an inwardly directed curvature can occur. As a result, the contact area between flat pipe wall section and solid body decreases in comparison to the ideal flat surface again and further increase the pipe losses.

The invention was thus based on the object to address a heat exchanger tube and a method for producing such a heat exchanger tube, which improves the heat transfer between the heat exchanger tube and also the pipe losses are kept as low as possible in proportion.

The invention solves its underlying object in a heat exchanger tube for a heat exchanger assembly for conducting a heat transfer medium, in particular a heat transfer fluid, according to the aforementioned type, with the features of claim 1. In particular, the remaining, not for application to a sheet formed pipe wall areas one , based on the pipe cross-section, asymmetric pipe wall course on.

The invention makes use of the knowledge that on a heat exchanger tube with an asymmetrical tube wall course in the tube wall areas which are not in contact with a body for heat transfer, at the contact surface, a preferably flat flattened tube wall area for application to a separate Sheet can be formed, which is almost free of warping. Additional disadvantageously affecting pipe losses in the region of the pipe wall area serving as a contact surface are thus avoided. Accordingly, almost an optimum in the ratio between the heat transfer capacity, transmitted through the flat contact surface, and the resulting from the deformation of the pipe cross-section pipe losses is achieved. In one embodiment of the invention, such a heat transfer tube according to the invention, with respect to its tube cross-section, a straight or just running pipe wall area and at least one, but unevenly shaped, arcuate pipe wall area on. In the present case, an asymmetrical pipe wall progression is to be understood as meaning that the heat exchanger pipe according to the invention in the area of the contact or non-contact pipe wall regions, relative to the pipe cross section, is not axis-symmetrical or point-symmetrical.

A preferred development of the heat exchanger tube according to the invention provides for a flattened pipe wall area additionally flattened pipe wall area, wherein the surfaces of the pipe wall areas at an acute angle <90 °, preferably in the range of 25 ° to 70 °, more preferably in the range of 40 ° to 60 ° and in particular from 50 ° to 55 ° to each other. Although the flattened or flattened surface regions of the tube wall, which preferably extend at an acute angle to one another, intensify the deformation of the heat exchanger tube, this contributes to the preferably planar configuration being achieved on the tube wall section designed as a contact surface for application to a surface element. Due to the preferred angular range of the planar flattened tube wall area can be increased as a contact surface and the heat transfer can be improved with it, without resulting in a hollow shape of the contact surface.

In one embodiment of the invention, the surfaces of the tube wall regions form a vertex which is preferably outside the tube cross section of the heat exchanger tube. The additionally flattened area does not necessarily have an ideally flat shape. In the present case, a flattened tube wall region is also understood to mean a bent tube wall region whose bending radius is equal to or greater than twice the radius of the ideal cylindrical round tube, which is used as the starting product for the deformed heat exchanger tube.

Preferably, the flattened and the flattened tube wall region are connected to each other at their vertex via an arcuate tube wall region. The tube wall region, which connects the tube wall regions having essentially straight or slightly convexly curved tube wall profiles, has an arcuate course, in particular an annular course. In addition, the pipe losses within the heat exchanger tube are kept as low as possible. In a preferred embodiment of the invention, the arcuate tube wall region preferably at least partially has a radius which is smaller than the radius of the circular tube used for forming the heat exchanger tube according to the invention.

Preferably, the arcuate tube wall region which is opposite to the vertex between flattened and flattened tube wall region, based on the tube cross-section of the heat exchanger tube according to the invention, a uniform or non-uniform pipe wall profile. In the embodiment with the uniform pipe wall profile, in particular pipe wall radius, on the arcuate pipe wall region, the pipe cross-section preferably has a similar teardrop shape. The flattened and flattened pipe wall region can form substantially equal legs on the pipe cross section according to the invention. Again, the non-contact tube wall regions, based on the tube cross-section, are formed asymmetrically. In the embodiment in which the arcuate pipe wall portion has a non-uniform pipe wall course, the pipe cross section of the heat exchanger pipe can be favorably changed in that the flattened pipe wall portion used as a contact surface for abutment with a sheet has an increased leg length as compared to a Heat exchanger tube with arcuate tube wall area with uniform tube wall radius. The heat transfer is thus further improved.

In one embodiment of the invention, the flattened and flattened tube wall regions have a transition radius in the region of their vertex that has a ratio of approximately 1/2 to approximately 1/4 relative to the radius of the output tube. The flattened tube wall area serving as the contact surface and the flattened tube wall area preferably retain an arcuate connection area in one embodiment of the heat exchanger tube, thus avoiding damage to the tube wall during forming of the heat exchanger tube. The connecting region having an arcuate tube wall profile has a radius which is less than the radius of the round tube, which is used as the starting product for the production of the heat exchanger tube according to the invention. Preferably, the transition radius in the connection region to the radius of the round tube has a ratio which is in the range of about 1/2 to about 1/4.

Preferably, the heat exchanger tube in the longitudinal direction has a straight or a curved course or comprises a plurality of pipe sections, which extend in angles to one another in the longitudinal direction of the Übertragerohres. Thus, the effective contact surface is preferably independent of the cross-sectional shape of the Heat exchanger tube according to the invention based on the ratio of contact surface to length of the heat exchanger tube increases. Preferably, the heat transfer tube in the longitudinal direction has a shape which is selected from a group consisting of S-shape, M-shape W shape and meander shape. Especially with limited space requirements, where a relatively large amount of heat is dissipated through a relatively small heat transfer surface, find heat exchanger tubes with a curved course in the longitudinal direction application.

According to a further aspect, the invention relates to a heat exchanger assembly for a building services appliance, having at least one pipeline leading to a heat transfer medium, wherein a section of the pipeline is formed from an arrangement of a plurality of heat exchanger tubes connected in parallel to one another. The invention also solves the underlying object of a heat exchanger assembly in which at each heat exchanger tube of the arrangement, a longitudinally extending flattened tube wall area is provided for application to a sheet and the remaining, not for application to a sheet formed pipe wall areas a related on the pipe cross section, have asymmetrical pipe wall course. The invention is based on the finding that a preferably flat contact surface can be formed via the asymmetrically formed pipe wall profile, via which the heat transfer is improved in comparison with a commonly used heat exchanger pipe with a D-shaped pipe cross section. The heat exchanger tubes, which may have a straight course in the longitudinal direction or else a curved course as described in the previous paragraph, are preferably arranged substantially parallel next to one another.

Preferably, according to a further development of the heat exchanger assembly according to the invention, the flattened tube wall regions of the arrangement of a plurality of heat exchanger tubes form a common plane as an abutment or contact surface for a surface body that can be brought into contact with the heat exchanger assembly. In addition, it is achieved that the heat exchanger tubes of the arrangement according to the invention are preferably in uniform contact with a substantially flat surface of a solid body, such as a heat exchanger plate. In addition, a uniform heat transfer from the heat exchanger plate is effected in the heat exchanger assembly according to the invention. Depending on the geometry of the component to be brought into contact with the heat exchanger assembly, the heat exchanger tubes may also be arranged, if appropriate, in two planes extending at a predetermined angle to one another.

A preferred development of the heat exchanger assembly according to the invention provides that the arrangement has an equal number of heat exchanger tubes with mutually opposite pipe wall profiles. Preferably, the arrangement of the plurality of heat exchanger tubes to an even number of heat exchanger tubes, wherein the half of the heat exchanger tubes has a tube wall course, which is opposite to the course of the remaining half of the heat exchanger tubes. Under an opposite tube wall course of two heat exchanger tubes of an arrangement according to the invention is to be understood that the vertices of flattened tube wall portion and flattened tube wall area, based on the tube cross-section of both tubes and seen in the flow direction of the heat transfer tubes flowing heat transfer medium, are arranged on opposite sides of the heat exchanger tubes , Such an inventive arrangement with opposite tube wall progressions causes a simplified production of such an assembly according to the invention.

In a further aspect, the invention also relates to a domestic appliance, in particular a heat pump, with a heat exchanger module and a surface body in contact with the heat exchanger module, preferably a heat exchanger plate.

The domestic appliance according to the invention solves the task described in particular by providing a heat exchanger assembly according to one of the preferred embodiments described above. The invention is based on the finding that with the aid of such inventively designed heat exchanger assembly within a home automation device, for example, on a preferably having a power electronics control device of the building services equipment heat dissipated effectively on the heat exchanger assembly and unwanted overheating of the power electronics is thus avoided , In addition, the assembly of the heat exchanger assembly is simplified on the sheet of the building services equipment, since it can be dispensed with the use of a heat transfer improving thermal paste. Preferably, the heat exchanger tubes are connected in parallel, whereby a guided inside a pipeline heat transfer medium is divided into a plurality of parallel guided fluid streams when flowing through the plurality of particularly juxtaposed and mutually parallel heat exchanger tubes.

The preferred embodiments or developments described for the heat exchanger tube according to the invention are at the same time also preferred embodiments of the heat exchanger assembly as well as the domestic technology device according to the invention. Possible described preferred embodiments of the heat exchanger assembly or the building services equipment are also possible advantageous embodiments of the heat exchanger tube, unless they are fundamentally contradictory.

In a still further aspect, the invention relates to a method for producing a heat exchanger tube, in particular a heat exchanger tube according to one of the preferred embodiments described above.

The present invention solves the underlying problem with the below-mentioned method steps: providing round tube sections of predetermined length, and forming the round tube sections, preferably using a forming tool, to tube sections with a flattened tube wall area for application to a sheet and at least one other, not for application a sheet body formed pipe wall portion which, based on the pipe cross-section, after forming an asymmetric pipe wall course, wherein preferably an equal number of heat exchanger tubes are produced with opposite pipe wall course. With the generation of an asymmetrical pipe wall profile, the production of a substantially planar pipe wall region for improved heat transfer to a contact surface of a sheet is ensured on the heat exchanger pipes produced. A curvature on the pipe wall area of the heat exchanger tube serving as the contact surface, preferably inwards, can be avoided by way of this.

In a preferred embodiment, in order to compensate for the resulting in the manufacture of the heat exchanger tubes with asymmetric pipe wall during forming, preferably during pressing, the round tube forces acting unevenly in different directions of force, preferably an even number of heat exchanger tubes manufactured, and a generates the same number of pipe sections with opposite pipe wall progressions, in particular formed. This achieves a more uniform force effect during forming. In addition, the wear on the forming tool used to produce the heat exchanger tubes can be reduced. By the same number of heat exchanger tubes with opposite asymmetrical pipe wall course, the forces cancel each other in the transverse direction of the pressing movement. Furthermore, improved dimensional accuracy is achieved on the heat exchanger tubes to be produced.

• 1 eine perspektivische Ansicht eines Teils eines Haustechnikgerätes mit einer erfindungsgemäßen Wärmeübertrager-Baugruppe;
• 2 eine perspektivische Ansicht der erfindungsgemäßen Wärmeübertrager-Baugruppe nach 1;
• 3 eine perspektivische Ansicht eines einzelnen Wärmeübertragerrohres; und
• 4a und 4b Darstellungen verschiedener möglicher Querschnittsformen des Wärmeübertragerrohres nach 3.

The invention will be described in more detail below with reference to a preferred embodiment with reference to the accompanying figures. Hereby show:

• 1 a perspective view of a portion of a home automation device with a heat exchanger assembly according to the invention;
• 2 a perspective view of the heat exchanger assembly according to the invention according to 1 ;
• 3 a perspective view of a single heat exchanger tube; and
• 4a and 4b Representations of various possible cross-sectional shapes of the heat exchanger tube after 3 ,

In 1 is part of a home automation device 100 shown, in particular the control device 110 a heat pump, not shown. At the control device 110 is a sheet 120 arranged in the form of a heat exchanger plate. The sheet is a heat exchanger assembly 130 associated, which at least one pipeline 132 has, in which a heat transfer medium is guided. A section of the pipeline 132 includes an arrangement 134 from a plurality of substantially parallel to each other heat exchanger tubes 1 ,

2 shows the heat exchanger assembly 130 in an enlarged view. By means of the arrangement 134 from the heat exchanger tubes 1 Preferably takes place a division of the in the pipeline 132 guided heat transfer medium into a plurality of small parallel to each other and fluid-conducting fluid flows. About the isolated fluid streams, the heat transfer from the formed as a heat exchanger plate sheet 120 ( 1 ) effectively on through the heat exchanger tubes 1 flowing heat transfer medium done. To ensure the desired efficiency in heat transfer, has each heat exchanger tube 1 for conducting the heat transfer medium, a pipe wall 2 on, which in the longitudinal direction of the heat exchanger tube 1 extending flattened pipe wall area 4 for application to the sheet 120 having. The flattened pipe wall areas 4 the mutually parallel and in the embodiment shown also parallel to each other heat exchanger tubes 1 are or form a common plane 6 as an abutment or contact surface on the surface to be brought into contact with the heat exchanger assembly 130 120 out.

To ensure that the flattened pipe wall areas 4 , which for applying to the sheet 120 be used to obtain an ideal planar configuration during the forming of the round tube used as the starting material, it is provided that the remaining, not formed for the application to the sheet body wall portions have a relation to the pipe cross-section asymmetric pipe wall course, which by 3 Pictured heat exchanger tube 1 at least indicated and in particular from the representations of possible cross-sectional shapes of the heat exchanger tube 1 in the 4A and 4B is clarified.

In the in Fig. 4A and 4B Embodiments executed is the flattened pipe wall area 4 additionally a flattened pipe wall area 8th over the pipe wall course of the heat exchanger tube 1 intended. The flattened pipe wall area 4 and the flattened tube wall area 8th form surfaces 10 '10' out in the 4A and 4B shown embodiments at an acute angle α in the range of 25 ° to 70 ° to each other. The trained areas 10 '10' form a vertex 12 from, on the other hand, an arcuate pipe wall portion 14, 14 'is arranged. The arcuate tube wall region connects the mutually remote tube wall regions 4 . 8th , In the 4A has the arcuate tube wall area 14 a uniform pipe wall curve, so a uniform radius of curvature. The in 4A shown pipe cross-section of the heat exchanger tube 1 thus has the shape similar to a drop. This in 4B shown embodiment of a heat exchanger tube 1' includes an arcuate tube wall area 14 ' which has a nonuniform tube wall course. The radius of curvature along the arcuate tube wall area 14 ' is thus uneven or different. The flattened and flattened pipe wall area 4 . 8th points in the area of its vertex 12 a connection region 16 having a radius that has a ratio of about 1/2 to about 1/4 to the radius of the exit tube.

Again with reference to 2 it is stated that the arrangement of a plurality of heat exchanger tubes in the preferred embodiment shown, an even number of heat exchanger tubes 1 . 1' having. In each case, an equal number of the heat exchanger tubes have opposite pipe wall profiles. That means that similar in the 4A and 4B shown, the heat exchanger tubes are arranged with opposite tube wall progressions, that the respective vertices 12 facing each other and the respective arcuate Rohrwandungsbereiche 14 . 14 ' are arranged away from each other. The heat exchanger tubes with their mutually opposite pipe wall progressions are shown mirrored or arranged, so to speak, in a plane perpendicular to the contact surface mirror plane. It should be noted, however, that the heat exchanger tubes of an arrangement 134 of a plurality of heat exchanger tubes each have identical tube cross sections, ie either those shown in FIG. 4A or FIG 4B Having shown tube cross sections, which then to heat exchanger tubes 1 are arranged mirrored with opposite tube wall progressions.

LIST OF REFERENCE NUMBERS

1,1 '

heat exchanger tube

2

pipe wall

4

Flattened pipe wall area

6

level

8th

flattened pipe wall area

10, 10 '

area

12

vertex

14, 14 '

arcuate pipe wall area

16

connecting area

α

angle

100

Electrical appliance

110

control device

120

sheet

130

The heat exchanger assembly

132

pipeline

134

arrangement

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010018162 B3 [0006]

Claims (11)

Heat exchanger tube (1) for a heat exchanger assembly (130) for conducting a heat transfer medium, in particular a heat transfer fluid, which is adapted to conduct a heat transfer medium, in particular a heat transfer fluid, and having a through a pipe wall (2) limited flow cross-section for the heat transfer medium in that the tube wall (2) has a longitudinally flattened tube wall region (4) for application to a sheet (120), characterized in that the remaining tube wall regions (14 ') not formed for application to a sheet (120) , based on the tube cross-section, have asymmetric tube wall course. Heat exchanger tube (1) after Claim 1 characterized by a flattened pipe wall region (4) additionally flattened pipe wall region (8), wherein the surfaces of the pipe wall regions (4, 8) at an acute angle (α), preferably in the range of 25 ° to 70 ° to each other. Heat exchanger tube (1) after Claim 2 , characterized in that the flattened and the flattened tube wall region (4, 8) are connected to each other at their vertex (12) via an arcuate tube wall region (14, 14 '). Heat exchanger tube (1) after Claim 3 , characterized in that the arcuate tube wall region (14, 14 '), based on the tube cross section of the heat exchanger tube, has a uniform or non-uniform course. Heat exchanger tube (1) according to one of Claims 1 to 4 , characterized in that the flattened and the flattened tube wall region (4, 8) in the region of its vertex have a transition radius which has a radius of the output tube of a ratio of about 1/2 to about 1/4. Heat exchanger tube (1) according to one of Claims 2 to 5 , characterized in that the heat exchanger tube in the longitudinal direction has a straight or a curved course or comprises a plurality of pipe sections which extend in the longitudinal direction of the Übertragerohres at angles to each other. Heat exchanger assembly (130) for a domestic appliance (100), with at least one heat transfer medium leading pipeline, wherein a portion of the pipe (132) of an arrangement (134) of a plurality of substantially parallel to each other heat exchanger tubes (1) according to one of Claims 1 to 6 is trained. Heat exchanger assembly (130) after Claim 7 , characterized in that the flattened Rohrwandungsbereiche (4) of the arrangement (134) of a plurality of heat exchanger tubes (1) form a common plane as a contact or contact surface for a heat transfer unit with the assembly (130) can be brought into contact sheet (120). Heat exchanger assembly (130) after Claim 7 , characterized in that the arrangement (134) has an equal number of heat transfer tubes (1) with mutually opposite tube wall progressions. Domestic appliance (100), in particular heat pump, with - a heat exchanger assembly, and - one of the heat exchanger assembly (130) associated electrical control device, characterized in that the heat exchanger assembly (130) according to one of Claims 7 to 9 is trained. Method for producing a heat exchanger tube (1), in particular a heat exchanger tube (1) according to one of the Claims 1 to 6 comprising the steps of: providing round tube sections of predetermined length, and forming the round tube sections, preferably using a forming tool, into tube sections with a flattened tube wall section (4) for application to a sheet (120) and at least one other not for abutment Surface formed tubular wall portion (8, 14, 14 '), which, based on the pipe cross-section, after forming an asymmetric pipe wall course, preferably an equal number of heat exchanger tubes (1) are generated with mutually opposite pipe wall course.

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