DE102009017813A1 - Heat exchanger for passing fluid to be cooled or heated, particularly coolant evaporator of motor vehicle air conditioning system, has feed pipe with holes to supply fluid and delivery pipe with holes for discharging fluid - Google Patents

Abstract

The heat exchanger (10) has a feed pipe (1) with holes to supply the fluid, a delivery pipe (2) with holes for discharging the fluid and a pipe with a channel which is flow thoughable by the fluid. A collecting area (3) is provided whose sections are connected with the pipe. The feed pipe and the delivery pipe lie between a plane (13) on one end (11) and another plane (14) on another end (12). The two planes are aligned parallel and in transverse direction.

Description

The The invention relates to a heat exchanger according to the Preamble of claim 1 and an automotive air conditioning system.

Motor vehicle air conditioners serve to the supplied to the interior of a motor vehicle air to heat and / or cool.

The Automotive air conditioning is generally on in motor vehicles the center console between the two front seats below the Dashboard installed. Especially for smaller vehicles here is the available space small, so that also for the housing of the motor vehicle air conditioning only a small Space is available in a transverse direction of the motor vehicle. The size of the housing of the motor vehicle air conditioner is essentially due to the size of a arranged inside the housing of the motor vehicle air conditioner Refrigerant evaporator. The refrigerant evaporator is traversed in the transverse direction of air to be cooled and points to a longitudinal direction substantially perpendicular in the transverse direction of the refrigerant evaporator a larger Length as in the transverse direction. The refrigerant evaporator has a supply line and a drain as well as in general also a circulation line, which is above or below the refrigerant evaporator are arranged. The inlet and the outlet serve to cool the coolant through the refrigerant evaporator. In disadvantageous Here are the supply and the discharge in the area of Top or bottom of the refrigerant evaporator outside from two lateral ends of the refrigerant evaporator in Direction of the longitudinal direction formed. This increases the size of the refrigerant evaporator in the longitudinal direction, thereby increasing the size the vehicle air conditioner increases and unnecessarily space within the motor vehicle in the area of the center console needed becomes.

The DE 10 2006 004 983 A1 shows a generic heat exchanger as a refrigerant evaporator with a supply line, a derivative and flat tubes through which the refrigerant is passed, and a collection area. Adversely, while the lead and the discharge in the region of the collecting area out of the two ends of the heat exchanger to the flat tubes, thereby unnecessarily increasing the size of the heat exchanger in the longitudinal direction and thereby the vehicle air conditioning in a transverse direction of the motor vehicle unnecessary space in the area the center console needed.

The Object of the present invention is therefore a Heat exchanger and motor vehicle air conditioning for To provide, in or at the good heat transfer from the coolant to the air at a short length in Longitudinal direction of the heat exchanger possible is. The automotive air conditioning should be inexpensive to manufacture be and work reliably in operation.

These Task is solved with a heat exchanger, for passing a to be cooled or heated Fluids, in particular coolant evaporator of a motor vehicle air conditioning system with coolant as the fluid to be heated, comprising a supply line with bores, for supplying the fluid, wherein the fluid can be diverted through the bores out of the supply line, a drain with holes, for discharging the fluid, wherein the fluid can be introduced through the bores in the drain line is at least one tube with at least one channel of the Fluid is flowed through, at least one collecting area, wherein at least portions of the collecting area with the at least a tube are connected, wherein the heat exchanger in a transverse direction of a tempering fluid, in particular air, for cooling or heating the fluid, in particular Coolant is flowed through, in particular by the at least one tube can be flowed around by the tempering fluid is, wherein the heat exchanger in one of the Transverse direction substantially perpendicular longitudinal direction has a greater length than in the Transverse direction and wherein the heat exchanger a first end and a second end in the longitudinal direction, in particular at the at least one tube and / or the collecting area, wherein the supply and the discharge between a first level at the first end (longitudinally) and a second level lie at the second end (in the longitudinal direction), wherein the first and second planes are aligned in parallel and in the transverse direction.

The Supply line and the derivative needed so in an advantageous Way in the region of at least one tube and in the region of at least one collecting area no unnecessary space in the longitudinal direction of the heat transfer, so that when installed in an automotive air conditioning system the car air conditioner is not unnecessarily large in the direction of the longitudinal direction of the heat exchanger. The first end is at least partially within the first level and the second end lies at least partially within the second Level.

Especially the supply and the discharge are completely in between the first level and the second level.

In a further embodiment, the supply line and the discharge are in the region of the collecting area and / or in the region of the at least one tube, in particular completely, between the ers th level and the second level.

In a supplementary embodiment are the supply line and the derivative within a distance of less than 40 cm, preferably less than 30 cm or 20 cm, in particular less than 10 cm or 5 cm from the collecting area and / or the at least one Pipe between the first level and the second level.

Preferably are the supply and the discharge in the transverse direction at the collecting area arranged differently, in particular with a difference in Transverse direction of less than 7 cm or 5 cm, especially less than 3 cm or 2 cm or 1 cm or 0.5 cm. The arrangement of the supply line and the derivation in different positions in the transverse direction allows it, the holes for introducing and discharging the fluid in the transverse direction in different positions at the collecting area, in particular one upper plate element to provide. As difference in the transverse direction According to the invention, the distance between the centers the supply and discharge understood.

In a variant, the holes of the supply line in the transverse direction arranged differently on the collecting area and / or the holes are the drain line in the transverse direction at the collection area different arranged. The arrangement of the bores of the supply line and / or the Drainage in the transverse direction at different locations makes it possible For example, at the supply more holes closer to attach to the circulation line and another hole on away from the circulation line, with the farther away Bore the circulation line, for example, at the end of a curved Part of the supply line is formed.

expedient is the position difference of the holes of the supply line in Transverse direction at the collecting area and / or the position difference of the holes the discharge line in the transverse direction at the collection area less than 5 cm or 3 cm, preferably less than 2 cm or 1 cm or 0.5 cm.

In In another embodiment, the supply line and / or the derivative at the collection area with a deviation of less as 20 °, in particular substantially parallel, to the Longitudinally aligned.

Especially are at least two holes of the supply line at the collecting area and / or at least two bores of the discharge at the collecting area with a Deviation of less than 2 cm or 1 cm or 0.5 cm, in particular substantially the same, formed in the transverse direction.

In In another embodiment, the at least one tube is at least formed a flat tube and / or the tube is U-shaped bent.

In a complementary variant, the at least one tube at least two channels as flow paths to Passing the fluid on.

In a further variant, the supply line in the region of the connection with the collecting area an effective supply line length in longitudinal direction less than the effective total length, in particular less than half or one third of the effective total length of the collection area is.

In Another embodiment is connected to the collection area Provided circulation line, wherein fluid, in particular coolant, from a first subset of channels or flow paths out in the circulation line is introduced and out of the circulation line into a second subset of channels or flow paths exit.

Especially has at least one of the group lead or derivative or Redirecting a separating element, by means of which at least two sections fluidly from each other are separated.

In In another embodiment, the supply line is in the longitudinal direction oriented and arranged in the region of the collecting area and preferably associated with this.

In In one variant, the collecting area comprises a plurality of plate elements, by stacking the collection area at least partially buildable is.

In In another embodiment, the supply line is connected to an upper one Plate member of the collection area connected, wherein a plurality each corresponding perforations or holes in the upper plate member and in the supply line are provided.

In an additional embodiment opens at least one hole or opening of the supply line and upper Plate element in at least two channels or flow paths.

expedient is at least one of the channels or flow paths exactly one hole or opening of supply line and upper plate element assigned.

In a further embodiment, a plate-shaped distributor element is provided, wherein the coolant by means of a plurality of provided in the distributor element openings on the Multiple flow paths can be distributed.

In a variant, a lower plate member has a plurality of Breakthroughs on, with the flow paths in the area the apertures are fixed to the lower plate member.

Preferably is at least one of the flow paths as a U-shaped Flat tube formed with multiple chambers.

In an additional embodiment is the plurality of flow paths grouped into a number of sections, each section has at least one flow path, wherein the sections in the longitudinal direction of the heat exchanger next to each other are arranged and wherein fluidically between at least two of the sections on to an intermediate collection of the coolant suitable volume is provided.

In Another embodiment is the number of sections two or more even numbers.

In a complementary embodiment is the number of sections a total of three or more odd numbers.

Preferably is the coolant carbon dioxide.

In a further embodiment, the supply line in the Beriech of Connection to the collection area an effective supply line length in the longitudinal direction, which is shorter than the length the supply line itself is.

In In another embodiment, the supply line is in the region of the connection with the collecting area on several pipes, pipe sections or partial pipe sections divided up.

In In one variant, the supply line is essentially over the laid the entire length of the heat exchanger.

expedient At least the inlet or the outlet has a flattening on, with the flattening flat with the collection area is soldered.

Especially At least the supply or the discharge essentially has one D-shaped cross section on.

In Another embodiment is the cross section of at least the supply or the discharge outside the Area of planar soldering in essence circular.

In a supplementary embodiment has at least the supply line or the derivative on a molding, the form-fitting with a shape of the collecting area for the purpose of positioning the supply or discharge cooperates, the shaping allows no passage of coolant.

In a supplementary embodiment has at least the supply or discharge a plurality of holes or Openings, which with a plurality of holes or openings of the collecting area are aligned for the passage of coolant, wherein the holes or openings are not form-fitting interact.

expedient have at least the supply or the discharge holes or Breakthroughs for the purpose of coolant passage on, made by drilling or material wegnehmender punching are.

The Holes or openings in the supply line and / or the discharge and / or the circulation line have any shape, z. B. circular, rectangular, triangular or square.

A Automotive air conditioning system according to the invention comprises a heat exchanger described in this patent application.

In In one variant, the motor vehicle air conditioner comprises a housing, z. B. plastic, and / or a blower and / or a Air duct and / or at least one louver, z. Legs Air damper or a screen or a roller blind, and / or an electric Heating device and / or a heat exchanger for heating the guided by the automotive air conditioning system Air by means of a guided by the heat exchanger Coolant.

in the Below are embodiments of the invention with reference to the accompanying drawings described. It shows:

1 a top view of a first embodiment of a heat exchanger from the front,

2 a plan view of the heat exchanger according to 1 from above,

3 a plan view of the heat exchanger according to 1 of the page,

4 a sectional view BB according to 2 through the heat exchanger 1 in the area of a supply line,

5 a sectional view CC according to 2 through the heat exchanger according to 1 in the area of a derivative,

6 a sectional view AA according to 2 through the heat exchanger according to 1 in the area of a circulation line,

7 a plan view of a distributor plate of the heat exchanger according to 1 .

8th a plan view of an upper plate member of the heat exchanger according to 1 .

9 a plan view of a lower plate member of the heat exchanger according to 1 .

10 a sectional view of a flat tube of the heat exchanger according to 1 .

11 a top view of the heat exchanger from above in a second embodiment,

12 a top view of the heat exchanger from above in a third embodiment,

13 a top view of the heat exchanger from above in a fourth embodiment and

14 a top view of the heat exchanger from above in a fifth embodiment.

A heat exchanger or heat exchanger 10 According to the first embodiment is a refrigerant evaporator 16 for an automotive air conditioning system and comprises a tubular supply line 1 and a tubular discharge 2 , Both lines 1 . 2 are parallel to each other in a longitudinal direction of the evaporator 16 above a collection area extending over the entire evaporator length 3 arranged. Beyond the collection area 3 are supply line 1 and derivative 2 to a common flange plate 4 continued, via which they are connected to the other air conditioning system of the vehicle (not shown). In the area of continuations 1a . 2a between collection area 3 and flange plate 4 show the wires 1 . 2 a number of kinks and bends, whereby they are adapted to the individual geometry of the installation space in the vehicle.

Also parallel to the supply line 1 and the derivative 2 is a circulation line 5 above the collection area 3 arranged on this and extends over the entire length of the evaporator 16 or the coolant evaporator 16 , The circulation line 5 is formed as at its two ends in each case closed tube section and has approximately the same diameter as the supply line 1 and the derivative 2 , The diameters of supply line 1 , Derivation 2 and circulation line 5 However, they can also have different diameters.

The flat tubes 6 have at the lower ends U-shaped bent tubes for deflecting the refrigerant (not shown). Alternatively and as in 1 shown, the U-shaped tubes can be omitted and the redirecting of the coolant is from the end plates 17 in a similar manner as in the collection area 3 executed, so that the end plates 17 also a distributor plate 8th with openings 8a and preferably a plate member 7 with recesses 7a have (not shown).

Between the flat tubes 6 are corrugated ribs 15 arranged in 1 only partially shown. The coolant evaporator 16 has a first end laterally in the longitudinal direction 11 and a second end 12 on. A first level 13 that at the first end 11 is arranged or through the first end 11 runs, is perpendicular to the plane of 1 , In an analogous way passes through the second end 12 a second level 14 , which is also perpendicular to the drawing of 1 stands.

Each of the flat tubes 6 or multi-channel pipes 6 has a plurality of chambers or channels 6a on (see cross section through one of the flat tube legs in 10 ). In this example, only half of the chambers form in each case 6a each of the flat tubes 6 together from a flow path or is arranged hydraulically parallel. In the direction of the cooling air flow, ie perpendicular to the plane according to 1 Thus, in each case two flow paths are in each flat tube in depth behind each other.

The total of about twenty flat tubes 6 are with their approximately forty ends each in recesses 7a a lower plate member 7 (please refer 9 ) can be inserted and soldered there. A central, longitudinally extending bridge 7b of the plate element 7 separates the two groups of chambers 6a from each other.

For further training of the collection area 3 is a distributor plate 8th (please refer 7 ) plan on the lower end plate 7 or the lower plate member 7 applied and flat, but at least soldered along closed marginal lines with this. The distributor plate 8th has a number of backdrop-like openings 8a Partially with the breakthroughs 7a the lower end plate 7 and thus with the end faces of the flat tubes 6 aligned. Out of alignment parts of the openings, z. B. H-shaped openings 8b the distributor plate 8th are intended to connect different flow paths with each other. The H-shaped openings shown here connect two adjacent flat tubes 6 or four flow paths with each other.

Above the distributor plate 8th is an upper plate element 9 of the collection area 3 plan on the distributor plate 8th soldered. The plate element 9 has a number of circular openings 9a on, which were produced by punching on the same side. The punching creates on the side facing away from the distributor plate in each case a protruding collar (not shown), by means of which the supply line 1 , Derivation 2 and circulation line 5 are particularly easy to attach. Like from the 8th it can be seen, have the holes 9a Groupwise different widths, so that the different pressures and coolant densities in the evaporator 16 Account is taken.

Like the representations 4 to 6 show are the tubular conduits 1 . 2 and 5 each provided with holes, which with the punching previously described 9a of the upper plate element 9 correspond. In the course of mounting the coolant evaporator 16 become the wires 1 . 2 . 5 thus attached to the collar and soldered coolant-tight, which at the same time a mechanically secure connection between collection area and lines 1 . 2 . 5 is made.

The distances of the furthest holes 9a give an effective lengths of the respective line 1 . 2 . 5 , A total effective in terms of heat exchange evaporator length is useful as the largest distance between two flow paths in the longitudinal direction of the refrigerant evaporator 16 Are defined. It follows that in the present embodiment, the effective length of the supply line 1 is less than 40% of the effective evaporator length.

The invention now works as follows: Through the supply line 1 becomes the coolant evaporator 16 a high pressure, a liquid and gaseous phase having coolant supplied, which in the present case carbon dioxide (R 744) is. The coolant passes through the punches 9a or holes of the supply line 1 into a first group of six flow paths. It takes place in the H-shaped openings 9a a transfer to the six corresponding opposite flow paths, wherein in each case a first and a subsequently passed flow path to the same flat tube 6 belong ("submission in the depth"). After passing by 12 the flow paths of the refrigerant evaporator 16 The coolant enters through slightly larger holes 9a in the circulation line 5 one. These 12 first flow paths, the first six flat tubes 6 from the right according to 1 are thus grouped into a first section.

The circulation line 5 has the function of an intermediate collector, so that the coolant of the different flow paths is remixed. At the same time it flows according to 2 to the left, with the flow rate relative to the supply line 1 already significantly increased. By demixing related problems have already been significantly reduced at this point.

On the left side of the evaporator 16 form the remaining five flat tubes 6 a second group or a second section of ten flow paths. This is done through the holes 9a First, the entrance of the circulation line 5 in the first five flow paths of the second section and then by means of the H-shaped openings 8a the distributor plate 8th in the second five flow paths of the second section.

Ultimately, the fully vaporized and expanded coolant emerges from particularly large five punches 9a into the derivative 2 in order to be fed from there to the further refrigeration cycle.

According to the function of the refrigerant evaporator 16 become the flat tubes during the above operation 6 flows around cooling air, which is subsequently used for the air conditioning of a vehicle interior.

The second embodiment according to 11 differs from the first example according to 1 to 10 in the education of the punching 9a and their corresponding holes 9a in the pipes 1 . 2 . 5 as well as in the shape of the distributor plate 8th , All holes 9a the supply line 1 as well as the derivative 2 lie on a straight line. Furthermore, the supply line 1 in the area of the second end 12 to the upper plate member 9 or collection area 3 guided.

In the third embodiment according to 12 is the supply line 1 in the area of the first end 11 to the upper plate member 9 or collection area 3 guided. Furthermore, the length of the supply line 1 on the upper plate element 9 only slightly smaller than the size of the upper plate element 9 longitudinal. The supply line 1 is in the third embodiment according to 12 in an analogous manner as in the second embodiment according to 11 only partially within the first and second levels 13 . 14 in the area of the collection area 3 arranged.

In the fourth embodiment according to 13 in a manner analogous to the first embodiment, the supply and discharge of the coolant approximately centrally in the region of the upper plate element 9 through the supply line 1 and the derivative 2 , The supply and the discharge 2 are in the those areas in which they are parallel to the circulation line 5 are aligned, in the transverse direction of the refrigerant evaporator 16 arranged the same. The holes 9a the supply line 1 are in the transverse direction at the collecting area 3 arranged differently. Five holes 9a the supply line 1 are in the area in which the supply line 1 parallel to the circulation line 5 is ordered, aligned on a straight line, which is parallel to the circulation line 5 is arranged. Another, sixth hole 9a is at the supply line 1 after a bend portion of the supply line 1 educated. This makes it possible, even this curvature section of the supply line 1 for introducing the coolant into the collecting area 3 to use. The holes 9a the derivative 2 are analogous to the holes 9a the supply line 1 formed, wherein in that portion of the derivative 2 which is parallel to the circulation line 5 There are only four holes 9a are formed. As a result, advantageously, the curvature portion of the derivative 2 also for discharging coolant from the collecting area 3 into the derivative 2 be used.

In 14 a fifth embodiment is shown. The supply line 1 has two sections parallel to each other. A first section of the supply line 1 , in which the coolant flows first, has no holes 9a on. The coolant is discharged from the first section by means of a circulating bag 18 to the second section of the supply line 1 directed. The second section of the supply line 1 has six holes 9a for introducing the coolant into the collecting area 3 on.

In the 11 to 14 Embodiments two to five is the formation of the collecting area 3 , in particular the distributor plate 8th and the upper plate member 9 not shown. In particular, the openings 8a . 8b the distributor plate 8th and the holes 9a of the upper plate element 9 have to change to the first embodiment of the geometrically different orientation of the holes 9a the lines 1 . 2 . 5 within the collection area 3 be adjusted.

Overall, considered with the heat exchanger according to the invention 10 and the motor vehicle air conditioning system according to the invention considerable advantages. The heat exchanger 10 has in the longitudinal direction of the heat meübertragers 10 only a small size, because the supply line 1 and the derivative 2 the maximum dimensions of the heat exchanger 10 including the supply line 1 and the derivative 2 in the area of the collecting area due to the geometric guidance of the supply line 1 and the derivative 2 is not unnecessarily increased. Thereby, the size of the automotive air conditioning system in a direction parallel to the longitudinal direction of the heat exchanger 10 designed small and thereby be saved when installing the automotive air conditioning system in a motor vehicle in the center console space. This is a significant advantage, especially for smaller vehicles.

1

supply

2

derivation

3

collecting area

4

flange

5

circulation line

6

Tube, flat tube, multi-channel tube, 6a Chamber, channel

7

under the plate element, 7a recess 7b web

8th

Distribution plate, 8a . 8b perforations

9

Upper plate element, 9a Punching, drilling

10

Heat exchanger

11

first End of the heat exchanger

12

second End of the heat exchanger

13

First level

14

Second level

15

corrugated fins

16

Refrigerant evaporator

17

endplates

18

circulation bag

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102006004983 A1 [0004]

Claims (15)

Heat exchanger ( 10 ), for passing a fluid to be cooled or heated, in particular coolant evaporator ( 16 ) an automotive air conditioning system with coolant as the fluid to be heated, comprising - a supply line ( 1 ) with holes ( 9a ) to supply the fluid, whereby the fluid through the bores ( 9a ) from the supply line ( 1 ) is derivable, - a derivative ( 2 ) with holes ( 9a ), for discharging the fluid, wherein the fluid through the holes ( 9a ) into the drain line ( 2 ), - at least one tube ( 6 ) with at least one channel ( 6a ), which can be traversed by the fluid, - at least one collecting area ( 3 ), wherein at least portions of the collection area ( 3 ) with the at least one tube ( 6 ), the heat exchanger ( 10 ) in a transverse direction of a tempering fluid, in particular air, for cooling or heating of the fluid, in particular coolant, is flowed through, in particular by the at least one tube ( 6 ) is flowed around by the tempering fluid, - wherein the heat exchanger ( 10 ) has a greater length in a longitudinal direction substantially perpendicular to the transverse direction than in the transverse direction and - wherein the heat exchanger ( 10 ) a first end ( 11 ) and a second end ( 12 ) in the longitudinal direction, in particular on the at least one tube ( 6 ) and / or the collection area ( 3 ), characterized in that the supply line ( 1 ) and the derivative ( 2 ) between a first level ( 13 ) at the first end ( 11 ) and a second level ( 14 ) at the second end ( 12 ), the first and second levels ( 13 . 14 ) are aligned parallel and in the transverse direction. Heat exchanger according to claim 1, characterized in that the supply line ( 1 ) and the derivative ( 2 ) completely between the first level ( 13 ) and the second level ( 14 ) lie. Heat exchanger according to claim 1 or 2, characterized in that the supply line ( 1 ) and the derivative ( 2 ) in the area of the collecting area ( 3 ) and / or in the region of the at least one tube ( 6 ) between the first level ( 13 ) and the second level ( 14 ), in particular completely. Heat exchanger according to claim 3, characterized in that the supply line ( 1 ) and the derivative ( 2 ) within a distance of less than 40 cm, preferably less than 30 cm or 20 cm, in particular less than 10 cm or 5 cm, of the collecting area ( 3 ) and / or the at least one tube ( 6 ) between the first level ( 13 ) and the second level ( 14 ) lie. Heat exchanger according to one or more of the preceding claims, characterized in that the supply line ( 1 ) and the derivative ( 2 ) in the transverse direction at the collecting area ( 3 ) are arranged differently, in particular with a difference in the transverse direction of less than 7 cm or 5 cm, in particular less than 3 cm or 2 cm or 1 cm or 0.5 cm. Heat exchanger according to one or more of the preceding claims, characterized in that the bores ( 9a ) of the supply line ( 1 ) in the transverse direction at the collecting area ( 3 ) are arranged differently and / or the holes ( 9a ) of the drainage line ( 2 ) in the transverse direction at the collecting area ( 3 ) are arranged differently. Heat exchanger according to claim 6, characterized in that the position difference of the holes ( 9a ) of the supply line ( 1 ) in the transverse direction at the collecting area ( 3 ) and / or the positional difference of the holes ( 9a ) of the discharge line in the transverse direction at the collecting area ( 3 ) is less than 5 cm or 3 cm, preferably less than 2 cm or 1 cm or 0.5 cm. Heat exchanger according to one or more of the preceding claims, characterized in that the supply line ( 1 ) and / or the derivative ( 2 ) are aligned at the collection area with a deviation of less than 20 °, in particular substantially parallel, to the longitudinal direction. Heat exchanger according to one or more of the preceding claims, characterized in that at least two bores ( 9a ) of the supply line ( 1 ) at the collecting area ( 3 ) and / or at least two holes ( 9a ) of the derivative ( 2 ) at the collecting area ( 3 ) are formed with a deviation of less than 2 cm or 1 cm or 0.5 cm, in particular substantially the same, in the transverse direction. Heat exchanger according to one or more of the preceding claims, characterized in that the at least one tube ( 6 ) as a flat tube ( 6 ) is formed and / or the pipe ( 6 ) Is bent in a U-shape. Heat exchanger according to one or more of the preceding claims, characterized in that the at least one tube ( 6 ) at least two channels ( 6a ) as flow paths for passing the fluid. Heat exchanger according to one or more of the preceding claims, characterized in that the supply line ( 1 ) in the area of the connection to the collecting area ( 3 ) has an effective lead length in the longitudinal direction, the less than the effective total length, in particular less than half or one third of the effective total length, of the collecting area ( 3 ). Heat exchanger according to one or more of the preceding claims, characterized in that one with the collecting area ( 3 ) connected circulation line ( 5 ), wherein fluid, in particular coolant, from a first subset of channels ( 6a ) or flow paths out into the circulation line ( 5 ) and from the circulation line ( 5 ) into a second subset of channels ( 6a ) or flow paths. Heat exchanger according to one or more of the preceding claims, characterized in that at least one of the group supply line ( 1 ) or derivative ( 2 ) or redirection ( 5 ) has a separating element, by means of which at least two sections of the relevant line ( 1 . 2 . 5 ) are separated from each other. Motor vehicle air conditioning system, characterized in that the motor vehicle air conditioning system a heat exchanger ( 10 ) according to one or more of the preceding claims.