BRPI0507143B1 - HEAT EXCHANGE, IN PARTICULAR, CHATO PIPE CONDENSER FOR AN AUTOMOTIVE VEHICLE AIR CONDITIONING SYSTEM - Google Patents

Abstract

heat exchanger, in particular, flat tube condenser for a motor vehicle air conditioning system. The invention relates to a heat exchanger, in particular a flat tube evaporator (1) for a motor vehicle air conditioning system, with at least one plate (collector box 2) which is subdivided. in the longitudinal direction, at least in two chambers, and at the bottom of which are inserted the ends of tubes, in particular flat tubes, and the collection box (2) has a part of the tunnel box (5), a portion of the essentially flat collecting box (4) forming the bottom and front respectively a lid (6), with at least one lid (6) at least in its edge area The outer shell runs flat, and is positioned in the lockable pickup box due to the shape.

Description

(54) Title: HEAT EXCHANGER, IN PARTICULAR, FLAT TUBE CONDENSER FOR A MOTOR VEHICLE AIR CONDITIONING SYSTEM (51) Int.CI .: F28F 9/02; F28D 1/053 (30) Unionist Priority: 28/01/2004 DE 10 2004 004 494.5 (73) Holder (s): BEHR GMBH & CO. KG (72) Inventor (s): GOTTFRIED DÜRR; KLAUS DIETER FÕRSTER; MICHAEL KOHL; EMIL NEUMANN; FRANZ OTT; WOLFGANG SEEWALD (85) National Phase Start Date: 07/27/2006

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Descriptive Report of the Invention Patent for HEAT EXCHANGER, IN PARTICULAR, FLAT TUBE CONDENSER FOR A MOTOR VEHICLE AIR CONDITIONING SYSTEM.

[001] The present invention relates to a heat exchanger, in particular, flat tube evaporator for a motor vehicle air conditioning system, with at least one plate collector box, which is subdivided in the longitudinal direction, at least in two chambers, and at the bottom of which are inserted the ends of tubes, in particular flat tubes, and the collection box has a part of the collection box in the shape of a tunnel, a part of the collection box, in essence, flat , which forms the bottom and on the front side, respectively, a lid, with at least one lid, at least in its area of the outer edge, is executed flat and is positioned in the collector box with closure due to the shape.

[002] From the patent DE 198 26 881 A1 a heat transmitter is known, in particular an evaporator, in which a plate collector box is provided, which is molded from a prepared platinum.

[003] The platinum consists of an aluminum alloy, which also includes flat tubes, corrugated ribs and side parts, as well as other elements of the heat transmitter. First it is stamped from a plate, which is then molded, in such a way that a flat bottom is formed (in essence, a flat part of the collection box), in whose longitudinal corners are connected folded parts (parts of the collection box in the form tunnel). The folded parts are curved in a radius to form a cylindrical surface, of which the longitudinal edges are folded in such a way that they touch parallel to each other, and pass, in essence, perpendicular to the bottom. The longitudinal edges are provided with several clips, arranged in a distributed way through

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2/16 its length, which are inserted through recesses in the bottom, and caulked on the external side facing the flat tubes. In this way, a collection box is formed with the two chambers, which presents a relatively high resistance, before an oxyacetylene welding occurs. The platinum receives a solder plate, or is provided with a solder coating.

[004] At the bottom, there are, respectively, passages, in which the flat tubes are received. Respectively, in the area of the longitudinal corners of the bottom, from which the parts are curved, the passages are brought up to the longitudinal edges that touch each other. This results in a depth for the heat exchanger, which is only slightly greater than the sum of the depths of the flat tubes. The longitudinal edges of the parts are provided with recesses aligned with each other, which are in the section separated from the supply and discharge side, between the transverse wall and the end of the collecting chamber. The transverse walls are inserted from the outside into the chambers. For this purpose, cracks in the parts or bottom are provided.

[005] During the manufacture of the collection box, first a flat platinum is manufactured, in particular, by stamping, in which the necessary clips are stamped, as well as the openings that later receive these clips, as well as recesses. Then, first the longitudinal edges of the parts are curved. Then, the passages are incorporated. If the partition walls are to be inserted into the chambers from the bottom, then during the production of the passages, in the same work step, the slits in the form of passage for the partition walls are also provided. If the partition walls are to be inserted into the chambers from the side, then the necessary slots for this are already incorporated into the flat plate. After the production of the tickets,

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3/16 the collection box is curved ready. Then the clips are tightened.

[006] Before oxyacetylene welding of the heat exchanger equipped with flat tubes and with corrugated ribs and side parts, the front ends of the collection boxes are closed by means of inserted lids. The lids are manufactured as a pressed sheet part, which has a stamped, continuous edge corresponding to the contour of the front ends of the collecting boxes. In this case, one of the covers has openings, for connecting the supply and discharge of the cooling medium. The edge is provided with a transverse stamping in the area of the longitudinal edges, which is adapted to the sum of the wall thicknesses of the longitudinal edges. Due to the stamped edge, a step appears that touches the inner walls of the collection boxes during the placement of the lid, and forms a snap connection with closure due to friction. This locking connection due to friction is supported by means of several clips, which connect to the printed edge and are folded around 90 ^o . These clips grip the collection boxes around the outside.

[007] Furthermore, in the usual rib densities according to the standard (also in small rib heights), known evaporators have ribs or a small opening angle between the individual ribs, which are almost parallel that due to capillary forces they tend to have an unfavorable water accumulation behavior, that is, they accumulate a lot of water in the place, due to the given geometry.

[008] In the event of poor water discharge, under circumstances, evaporators tend to spray - especially in the case of large amounts of air and small frontal surfaces - which, in turn, limits the permitted rib density (number of sections ribbed by

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4/16 length unit in the longitudinal direction of the tubes). The danger of spraying becomes greater the more condensate accumulates on the individual turns of the rib, or the smaller the surface that is freely traversed by air.

[009] An unfavorable behavior of water accumulation and discharge, due to the geometry of the rib provided, for example, the evaporators with ribs or small opening angles almost parallel between the individual rib sections. In particular, then, the current speed or the amount of air is limited, to the extent that a spray can still be avoided.

[0010] The task of the present invention is to provide an improved heat exchanger. One task is, in particular, an improved water separation and / or a reduction in the water accumulation capacity.

[0011] This task is solved by a heat exchanger where the cover is inserted from the front side, and on the side of the collection box it touches several backs, which are formed in the part of the collection box in the shape of a tunnel and / or in the part of the flat collector box, the lid is locked using folded clips.

[0012] According to the invention, a heat exchanger with at least one plate collector box is provided, which is subdivided in the longitudinal direction, at least into two chambers, and at the bottom of which the pipe ends are inserted , in particular, of flat tubes, and the collection box presents a part of the collection box in the shape of a tunnel, a part of the collection box, in essence, flat, which forms the bottom and on the front side, respectively, a lid, being that at least one cover, at least in its outer edge area, is executed flat and is positioned in the collector box with a closure due to its shape. Through the flat execution of the cover, it is possible to manufacture the cover simply by

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5/16 a plate, as well as, a simple adaptation. The lids take up less space compared to traditional deep-drawn lids, such that the heat exchanger is made smaller. Before, for the closed front sides of the heat exchanger, a plate can be used, which corresponds, at least, in essence, to the plates of the partition wall. The positioning capacity with closure due to the shape ensures optimized oxyacetylene welding in the collection box.

[0013] The lid is preferably inserted from the front side, and on the side of the collection box it touches several backs, which are formed on the part of the collection box in the shape of a tunnel and / or on the part of the flat collection box . On the external side, the cover is secured, preferably by means of several folded clips, and the clips are spaced apart from the backrests in such a way that the cover is received between them as much as possible free from play. The clips can be curved around an axis that runs parallel to the longitudinal axis of the collection box. Alternatively, they can be folded from the outside to the inside. In order to ensure safe oxyacetylene welding, the cover has a thickness of at least 1 to 2 mm, preferably 1.5 mm, in the area in contact with the collection boxes. Due to the closed positioning due to the shape prior to oxyacetylene welding, an improved lid seal results. In addition, the safety of the process can be increased in such a way that less defective heat exchangers are produced.

[0014] The clips are preferably part of the part of the collection box in the form of a tunnel and / or part of the flat collection box, and through the slits stamped on the platinum that forms the part of the corresponding collection box they are executed in one piece with them.

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6/16 [0015] In the case of feeding and / or discharging the cooling medium on the front side, the cover preferably has an opening, the edge of which is curved outwards. The opening is preferably carried out in the form of a circle, in particular as a passage, and it is also possible to carry out another type, in particular an oval opening, so that the surface of the lid can be optimized use with maximum current surface.

[0016] The opening is preferably carried out tapered, in particular, with an angle of the edge in relation to the longitudinal axis of the passage of at most 5 ^o , particularly preferably from 2 ^o to 3 ^o , in such a way so that self-locking is ensured.

[0017] A suction tube is preferably provided, which is placed on the lid with an opening, which has an internal diameter, which corresponds approximately to the outer diameter of the edge that limits the opening, with the suction tube being inserted through the passage. This enables a cross-section of constant current that slightly extends in the current direction, so that this section is executed as large as possible and that the pressure drop on the side of the cooling medium can be kept as small as possible. With this, the evaporation power can be increased.

[0018] An injection tube that is placed on the lid with an opening preferably has an outside diameter, which corresponds approximately to the minimum inside diameter of the edge that limits the opening.

[0019] To facilitate the introduction of the lid, the edge of the collector box plate has an introduction chamfer for the covers, and this chamfer can be executed as an edge, but can also be rounded.

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7/16 [0020] The two parts of the tunnel-shaped collection box preferably have a shape, in essence, in the shape of a semicircle, which acts positively on the resistance properties of the collection box in such a way that the thickness of material - compared to traditional collection boxes - can preferably be reduced, in particular, to wall thicknesses of about 0.8 mm, by placing an injection tube and suction tube on one of the front sides (via two lids), or in the case of placement on the longitudinal side of them, through a connection shoulder in the area of the collecting box, of about 1 mm. Due to the reduction in sheet thickness, material and weight savings are achieved, so that manufacturing costs and subsequent operating costs can be reduced.

[0021] The flat tubes used preferably have a width of 2 to 3 mm, with which they are built narrower than traditional flat tubes.

[0022] The heat exchanger can be traversed by 4 or more flows, in particular by 6 flows, depending on the width of the block.

[0023] According to another aspect of the present invention, a heat exchanger has flat tubes and corrugated ribs, the corrugated ribs having a rib height, which corresponds to the distance, respectively, of two flat tubes, and being that, respectively, two sections of ribs connected through an arc of the rib are inclined with respect to each other under an opening angle a. In the case of a rib height of 3 to 6 mm, preferably of 4 to 5 mm, and a rib density of 50 to 90 ribs, preferably of 60 to 80 ribs, particularly preferably 70 ribs , every 100 mm, according to the present invention, results in an enlarged angle between the individual ribs (with the same density of ribs, and the same radius of curPetition 870170067685, of 12/09/2017, page 13/25

8/16 vature). Due to this greater opening angle of the ribs, a smaller capillary effect is obtained in the rib turns, which leads to a better behavior of condensation and discharge water or to a smaller amount of water accumulated in the area in the rib turns. and therefore also on the evaporator, as well as, eventually, the danger of spraying the evaporator is reduced. The opening angle of at least two rib sections, preferably many or all of the rib sections, in this case is preferably 22 ^o + / - 7 ^o , or 30 ^o + / - 10 ^o .

[0024] Another extension of the opening angle can be obtained, under circumstances, if one or more arches of the rib have at least, per section, a radius of curvature less than 0.4 mm, preferably less than or equal to 0.35 mm, particularly preferably less than or equal to 0.3 mm. In this case, the width of the flat tubes is advantageously about 1.5 to 3 mm.

[0025] By means of a lower rib height or an opening angle of the larger rib it is reduced for a capillary effect in the rib turns, in such a way that less condensate remains in the rib turns. With this, a smaller amount of water that can be accumulated is connected, as well as, under circumstances, a better water discharge and, eventually, a lesser risk of spraying. On the other hand, a smaller rib height leads to a distribution of the condensate to more ribs and tubes (more heat exchange surface), in such a way that, altogether, it accumulates less condensate in each lap of the rib. On the other hand, this results in less danger of spraying and, under circumstances, a more favorable discharge behavior along the tubes and / or ribs.

[0026] Indirect advantages are possibly a higher permissible rib density and, as a result, a higher power potential, less danger of bacterial growth and, with

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9/16 this, a lesser odor formation as well as, eventually, cost savings through simpler surface treatment, which under circumstances can even be completely abolished. In addition, a reduction in a so-called flash-fog hazard (sudden fogging of the windshield due to moisture from the evaporator) is possible by faster drying of the evaporator surface.

[0027] Such a heat exchanger is used, in particular, as a flat tube evaporator for a motor vehicle air conditioning system.

[0028] Next, the invention will be clarified, in detail, with the aid of an example of execution, with reference to the drawing. The drawing shows:

figure 1 - a perspective representation of a collection box, figure 2 - a detailed view of the collection box in figure 1, figure 3 - the collection box in figure 1 before assembling the covers placed on the front side, figure 4 - a detailed view of figure 3, figure 5 - a detailed view of the collection box of figure 1, with the right cover of the two covers not shown, figure 6 - a detailed view corresponding to figure 5, from another perspective, figure 7 - a view side over the cover, figure 8 - a section along line AA in figure 7, figure 9 - a sectional representation without a cover corresponding to figure 8, figure 10 - a section through the two caps with mounted suction and injection tubes , figure 11 - a section in the longitudinal direction of the collection box Petition 870170067685, of 12/09/2017, p. 15/25

10/16 ra for the representation of a separation wall, figures 12a, 12b - of two sheets of corrugated rib, a figure of which is known in figure 12a and a shape for a greater density of pipe is shown in figure 12b flat, figures 13a, 13b - respectively, a cutout of a corrugated rib of an evaporator in different geometries, figure 14 - the amount of water accumulated as a function of the heat exchange surface, figure 15 - the amount of water accumulated as a function of rib height (when operating at a given point of operation and on the same heat exchange surfaces), and figure 16 - the amount of critical air from an evaporator vaporization, depending on the height of the rib.

[0029] A flat tube evaporator 1 (only partially shown) of a motor vehicle air conditioning system, as already described, with reference to the DE 198 26 881 A1 patent, has two collector boxes 2, flat tubes (not shown) ) that pass between the two collector boxes 2, and corrugated ribs 3, which are arranged between the flat tubes. Each collection box 2, according to the execution example, is formed of a platinum, which is stamped from a plate, and then is shaped in such a way that a part of the collection box 4 flat and two parts of the collection box 5 are formed. tunnel-shaped (see, in particular, Figures 4 and 6). The longitudinal edges are provided with several clips, arranged in a distributed way along their length, which are inserted through recesses in the part of the collecting box 4 flat, and are caulked on the external side facing the flat tubes. The front ends are closed by means of covers 6 described in detail at a later location.

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11/16 [0030] In the flat collector box part 4, an infinite number of passages 7 are formed, in which the flat tubes are conducted, and the opening of the passages 7 corresponds, in essence, to the external shape of the flat tubes.

[0031] The two parts of the collection box 5 in the shape of a tunnel, due to a relatively small construction depth, have a shape, in essence, in the shape of a semicircle, as can be deduced, for example, from the representation of figure 7 Due to the improved resistance properties, as a result of the shape of the parts of the collection box 5, in the shape of a semicircle, and / or the smaller construction depth, wall thicknesses from 0.8 to 1 mm are possible, as opposed to usual wall thicknesses from 1.2 to 1.5 mm.

[0032] Inside the collection box 2, one or more separation walls 8 are provided, through which the current path for a fluid, such as the cooling medium, through the heat exchanger, in particular, can be determined. , through its flat tubes. The separation walls 8 can be inserted through slots 9, preferably in a part of the collecting box 4 flat, the separation walls 8 being arranged, respectively, between two openings or passages 7 for the tubes, such as, flat tubes, and the distance of the passages 7 through the separation walls 8 is preferably not changed. For this purpose, for example, in an area in the collecting box 2, a gap in the separation wall is stamped or made in any other way, such that, under circumstances, no passage is formed, and / or in another area a guide element, such as a guide groove, for example, with a depth of 0.2 to 0.3 mm, is provided for a partition wall guide 8 (see figure 11).

[0033] The caps 6 made up of a plate are placed in the

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12/16 collector box 2 from the front side, which are inserted up to the backrests 10 formed by the backrest pins, which are executed on the stage by means of stamping, and are locked by means of clips 11 stamped during the manufacture of the stage and folded after positioning the cover 6. For easier insertion of the covers 6, insertion chamfers are provided on the stage (see, for example, the corner that passes approximately half the thickness of the stage in figure 9). Both the clamps 11, as well as the backrests 10 are located in the part of the collection box 5 in the form of a tunnel, seen in the longitudinal direction of the collection box 2, respectively, at the same height. According to the present execution example, for each lid 6 in the flat collector box part 4, only one backrest 10 is provided and two tabs 11 are moved in relation to this, however, according to a variant not shown in the drawing, also an execution form corresponding to the part of the collecting box 5 in the form of a tunnel is possible. Seen in the longitudinal direction of the collecting box 2, the clips 11 are spaced from the backrests 10 with each other, around the thickness of the plate that forms the lid 6, in such a way that an exact positioning is possible due to a lockable connection due to shape before oxyacetylene welding.

[0034] According to the example of execution in question, the clips 11 are curved around an axis, which passes parallel to the longitudinal axis of the collection boxes. According to a variant not shown in the drawing, it is also possible to fold the clips in the direction of the lid, so that only for each clip two slots in the stage need to be provided that pass in the direction of the collecting box. In addition, according to another variant not shown in the drawing, the cap entry limit can be limited, respectively, by the first pass to the

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13/16 flat tubes, in such a way that they still need to be provided with backrests in the part of the collection box in the form of a tunnel, and the total length of the collection box can be used in an optimized way.

[0035] The cooling medium is fed and discharged, as can be deduced from figure 10, through an injection tube 13 or a suction tube 14 placed in each cover 6 provided with an opening 12. The openings 9 of the lids 6 are executed as passages in the correspondingly stamped sheet part, the lids 6 being mounted in the collecting boxes 2 in such a way that the edges of the passage project outwards, respectively. The thickness of the outlet plate of the lid 6, ie the thickness of the unprocessed plate is about 1.5 mm, in order to ensure an oxyacetylene solder connection on the narrow sides and a sufficient material thickness for the passages , in such a way that a sufficiently large connection surface and therefore a secure connection can be guaranteed between the tubes for the supply and discharge of the cooling medium, and for the passages. In this case, the lids 6 are also made flat without passing through, at least, in their outer edge areas, adjacent to the platen of the collection box 2.

[0036] The passage to the injection tube 13 is made in such a way that the injection tube 13 is inserted in the opening 12 up to the height of the backrests 10. For this, the passage of the cap 6 has a slightly tapered internal diameter, which reduces outwards through the length of the passage. The passage for the suction tube 14 has an outside diameter that reduces outwards, with the suction tube 14 slightly enlarged at its end being pushed out. The chamfer in the two openings 12 is preferably 2 to 3 ^o , but not more than 5 ^o .

[0037] Preferably, flat tubes of 5 combs are used,

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14/16 in particular, with a width of about 2.5 mm, with the web gap remaining unchanged, such that the pressure drop on the air side does not increase, or only increases imperceptibly, compared with known evaporators with normal construction depth. The evaporator flow can occur, for example, with 6 or, in particular, 4 flows in the case of small block widths.

[0038] In figure 13 the geometry of ribs (opening angle a between sections of adjacent ribs 101, which are connected through an arc of rib 102), with 8 mm (figure 13a), and 4.5 mm of rib height (figure 13b), that is, respectively, in 60 ribs per 100 mm. In figure 13b an arc of the rib 102 is shown, with a smaller radius of curvature (compared to figure 13a). In this context, it should be remembered that a radius of curvature can be different at each point of the arc of the rib 102 and that, therefore, with the exception of a cross-section in the form of a circular arc, other symmetrical or asymmetric shapes of the arc are also possible rib 102.

[0039] For example, in the case of a construction depth of T = 40 mm, ribs with a rib height h = 4.5 mm can be used, so more flat ribs and tubes are possible, or a degree of efficiency of the larger rib and more heat transfer surface - with the same evaporator size. In this way, a higher power density is obtained.

[0040] Figure 14 shows the amounts of water accumulated as a function of the heat exchange surface of tested heat exchangers, with the height of the rib 1 being greater than the height of the rib 2, and the height of the rib 2 is greater than the height of the rib 3. In this case, a positive influence of the height of the smaller rib on the accumulation power can also be observed. The

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15/16 values were determined by means of a simple exploration test, in which the evaporator is first immersed in a water bath and, after removal, after a certain amount of dripping, the amount of residual water that remains found in the evaporator by weighing.

[0041] Figure 15 shows the accumulated amounts of water referring to the heat exchange surface, depending on the height of the rib, with the height of the rib decreasing to the right. The values were determined during operation at a predetermined operating point.

[0042] In figure 16 the critical air quantities are recorded through the height of the rib, from which a spray from the respective evaporator starts (similarly, values determined in the operation). The height of the rib, in this case, increases to the right. [0043] In evaporators according to the state of the art the opening angle a is approximately 14 ^o (in the case of 60 ribs per 100 mm), or lower. In the new rib geometry (H =

4.5 mm, T = 40 mm) angles of about 28 ^o can be obtained (in turn, in the case of 60 ribs per 100 mm) (compare figure 13). In the case of even smaller execution of the radii of curvature of the ribs of the rib 102, the opening angle can continue to increase.

[0044] Due to the improved anti-vapor behavior, in addition, higher rib densities are allowed, which in turn act positively on the power, although, with this, the opening angle is reduced slightly again. In a preferred embodiment, a rib of 4.5 mm in height is used, with a rib density of> = 70 ribs per 100 mm, the opening angle then being approximately 22 ^o .

[0045] The resulting angle, in the case of a 6 mm rib

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16/16 height, it is between 15 ^o and 22 ^o (evaporators with a 6 mm high rib also show a better discharge and accumulation behavior than evaporators with a 8 mm high rib, in this case, without a doubt , also the number of discharge surfaces or flat pipes is already higher). In addition, the water tank is further favored by a larger discharge surface that is available along the flat pipes or by the greater number of discharge surfaces / flat pipes with comparable condensate accumulation.

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Claims (15)

1. Heat exchanger, in particular, flat tube evaporator (1) for a motor vehicle air conditioning system, with at least one plate collector box (2), which is subdivided in the longitudinal direction at least in two chambers, at the bottom of which the ends of tubes, in particular flat tubes, are inserted, and the collection box (2) presents a part of the collection box (5) in the form of a tunnel, a part of the collection box (4 ), in essence, flat, which forms the bottom and the front side, respectively, a lid (6), with at least one lid (6), at least in its area of the outer edge being executed flat and positioned in the collector box with closure due to the shape, characterized by the fact that the lid (6) is introduced from the front side, and on the collector box side it touches several backrests (10), which are formed in the collector box part (5 ) in the form of a tunnel and / or in the part of the collecting box (4) flat, and the cover (6) is locked by means of folded tabs (11). 2. Heat exchanger, according to claim 1, characterized by the fact that the clips (11) are part of the part of the collection box (5) in the form of a tunnel and / or part of the collection box (4) flat . Heat exchanger according to either of claims 1 or 2, characterized in that the cover (6) has an opening (12) for feeding or discharging the cooling medium, whose edge is curved, in particularly, out. 4. Heat exchanger, according to claim 3, characterized by the fact that the opening (12) is executed as a passage. Heat exchanger according to either of claims 3 or 4, characterized in that the opening (12) is Petition 870170067685, of 9/12/2017, p. 23/25 2/3 conical, with an angle of at most 5 ^o , in particular from 2 ^o to 3 ^o . Heat exchanger according to any one of claims 3 to 5, characterized by the fact that a suction tube (14), which is placed in the cover (6) with an opening (12), has a diameter internal, which corresponds approximately to the external diameter of the edge that limits the opening (12). 7. Heat exchanger according to any one of claims 3 to 6, characterized by the fact that an injection tube (13) that is placed in the cover (6) with an opening (12) has an outside diameter, that corresponds, approximately, to the minimum internal diameter of the edge that limits the opening. 8. Heat exchanger, according to any one of the previous claims, characterized by the fact that the edge of the collector box plate has an introduction chamfer for the cover (6). 9. Heat exchanger, according to any of the preceding claims, characterized by the fact that the two parts of the collection box (5) in the form of a tunnel have a shape, in essence, in the shape of a semicircle. 10. Heat exchanger according to any one of the preceding claims, characterized by the fact that the separation walls (8) are arranged in the heat exchanger in such a way that the heat exchanger is traversed by 4 or more flows . 11. Heat exchanger according to any one of the preceding claims, with flat tubes and corrugated ribs, with at least one collecting box, at the bottom of which the ends of the flat tubes are inserted, with the corrugated ribs having a height rib, which corresponds to the distance, respectively, of two flat tubes, and, respectively, Petition 870170067685, of 9/12/2017, p. 24/25 3/3 two sections of ribs connected through a rib arc are inclined relative to each other under an opening angle a, characterized by the fact that the corrugated rib (3) has a height of 3 to 6 mm, from preferably 4 to 5 mm, and a rib density of 50 to 90 ribs, preferably 60 to 80 ribs, particularly preferably 70 ribs, every 100 mm. 12. Heat exchanger according to any one of the preceding claims, characterized by the fact that the opening angle of at least two rib sections, preferably many or all rib sections, is 22 ^o + / - 7 ^o , or 30 ^o + / 10 ^o . 13. Heat exchanger according to any one of the preceding claims, characterized by the fact that one or more rib arches have at least, per section, a radius of curvature less than 0.4 mm, preferably less or equal to 0.35 mm, particularly preferably less than or equal to 0.3 mm. 14. Heat exchanger according to any one of the preceding claims, characterized by the fact that the flat tubes have a width of about 1.5 to 3 mm. 15. Motor vehicle air conditioning system, characterized by an evaporator as defined in any of the preceding claims. Petition 870170067685, of 9/12/2017, p. 25/25 • · · * ···· sssssss 60 Ri / çfm Rg. 12b 5/8