EP2049859A1

EP2049859A1 - Motor vehicle air conditioning system, heat exchanger, in particular radiators, for a motor vehicle air conditioning system of this type and method of operation of a heat exchanger in a motor vehicle air conditioning system

Info

Publication number: EP2049859A1
Application number: EP07801424A
Authority: EP
Inventors: Matthias Traub; Frederik GÖTZ; Christoph Walter; Michael Kohl
Original assignee: Behr GmbH and Co KG
Current assignee: Mahle Behr GmbH and Co KG
Priority date: 2006-08-02
Filing date: 2007-07-12
Publication date: 2009-04-22
Anticipated expiration: 2027-07-12
Also published as: ATE510177T1; DE102006035994A1; WO2008014877A1; EP2049859B1

Abstract

The invention relates to a heat exchanger for a motor vehicle air conditioning system, in particular a radiator device (1) for a motor vehicle air conditioning system, which heat exchanger (1) exhibits a first coolant box (10) and a second coolant box (12) that is distanced from the first coolant box (10), as well as multiple tubes (14) by means of which the flow between the first coolant box (10) and the second coolant box (12) is connected. Tubing spaces (42) for airflow are formed between these tubes (14), wherein the coolant boxes (10, 12), together with these flow tubes (14) that connect these coolant boxes (10, 12), are arranged so that an airflow can be formed in the tubing spaces (42) in a first section of the tube or tubing rib block (66) and, conversely, at the same time, an airflow can be formed in the tubing spaces (42) in a second section of this tube or tubing rib block (66), in both sections respectively, according to the operative counter-current heat exchange principle.

Description

Automotive air conditioning system, heat exchanger, in particular radiator, for such a motor vehicle air conditioning system and method for

Operating a heat exchanger of an automotive air conditioning system

The invention relates to an automotive air conditioning system, a heat exchanger, in particular radiator, for such a motor vehicle air conditioning system, and a method for operating a heat exchanger of a motor vehicle air conditioning system.

Heat exchangers are often designed so that when a deflection of the gas or fluid takes place in the interior of the tubes in the depth, the flow direction of the heat exchanger flowing through the air over the entire heat exchanger network is the same.

If the volume flow is deflected on the inside of a heat exchanger in depth, this is done in hitherto known embodiments throughout the heating network throughout.

In general, the direction of flow of the air through the heat exchanger network in the known heat exchangers is such that the volume flow in the interior of the tubes with respect to the air flow through is or produces a cross-counterflow. This is also thermodynamically appropriate, since the air in this way in the embodiment as a radiator highest or a high or in the embodiment as an evaporator reaches the lowest or a low desired outlet temperature.

For certain applications, however, it may be appropriate or even necessary to "split" the heat exchanger, especially the heat exchanger network, and to flow through it under different air directions.

An example of such an embodiment is disclosed in DE 100 57 039 A1 (cf., in particular, FIG. In such embodiments, some areas of the heat exchanger are connected in the DC cross-flow and connected to other areas of the heat exchanger in cross countercurrent.

The invention is based on the object to provide a powerful heat exchanger, in particular a powerful heat exchanger, which can be used as a radiator for an air conditioning system of a motor vehicle.

According to the invention, a heat exchanger according to claim 1 or according to claim 4 is now proposed. An air conditioning system according to the invention is the subject of claim 12. A method according to the invention is the subject of claim 14. Preferred developments are subject of the dependent claims.

According to the invention, a heat exchanger device for a motor vehicle air conditioning system is now proposed, which is designed, for example, as a radiator device for a motor vehicle air conditioning system. The heat transfer device has a first coolant box and a second coolant box spaced from this first coolant box. Furthermore, the heat exchanger device has a multiplicity of tubes, which are designed, for example, as flat tubes and by means of which the first coolant box and the second coolant box are fluidically connected. It can be provided that these tubes, which may be formed in particular as flat tubes, are aligned parallel to each other. It can be provided that the each other opposite end faces of these flat tubes are open and formed between these end faces a respective continuous, straight channel in the tubes.

In particular, it is provided that the flat tubes are arranged relative to one another such that they form tube interstices for an air flow. In an expedient refinement, it is provided that corrugated ribs are provided in such intermediate tube spaces. The arrangement of the tubes thus forms a tube block or is formed by the arrangement of tubes and corrugated fins a tube / rib block.

The coolant boxes with the tubes connecting these coolant boxes are for the formation of a - in an air flow of the given in a first portion of the pipe or tube / fin block pipe interspaces and at the same time oppositely directed air flow in a second section of this Rohroder tube / Rib block given pipe interstices - in these two sections, ie formed in the first and in the second section, each acting on the cross-countercurrent principle heat exchanger.

The tubes or flat tubes may also have a plurality of channels formed parallel to each other.

The tubes or flat tubes can for example be arranged so that they form a (flat) tube row. It can also be provided that the tubes or flat tubes are arranged so that they form a plurality of mutually parallel (flat) rows of tubes.

In an advantageous embodiment, the heat exchanger is designed so that coolant flows into one of the two coolant boxes flows from this through pipes or flat tubes in the other of the two coolant boxes, is deflected there and flows through pipes or flat tubes back into the first coolant box, which it then leaves through appropriate outlet openings. - A -

In particular, provision is made for the tubes or flat tubes to be arranged relative to one another such that they form tube interspaces for an air flow. In an advantageous embodiment, it is provided that corrugated ribs are provided in such pipe interstices.

If a plurality of rows of tubes or channel rows are provided, it may be provided that separate corrugated ribs are provided for each of these rows of tubes or channels, or it may be provided that common corrugated ribs are provided for these rows of tubes or channels.

In an advantageous embodiment, it is provided that all inlet ports, one or more of which are provided in an expedient embodiment, and all outlets, of which one or more are also provided in an expedient design, are arranged on the same coolant box or in the same Open coolant box.

In an advantageous embodiment, it is provided that the heat exchanger is designed so that the media flowing through it cause at least in one section a cross counterflow and in at least one section a cross flow. In this case, it is provided in particular that the heat exchanger is designed so that, despite differently oriented air flow, it does not cause or can effect both a cross countercurrent and a crosscurrent flow.

At least one of the two coolant boxes is divided in an advantageous embodiment by means of one or more partitions into several chambers. In a particularly expedient embodiment, it is provided that the number of inlet nozzles deviates from the number of outlet nozzles. In particular, in such an embodiment, in which the number of inlet nozzles deviates from the number of outlet nozzles and in which all of these nozzles open into the same coolant box, it is inevitably provided that either at least two outlet nozzles or at least two Zulaufstutzen are provided. In a particularly expedient embodiment, it is provided that at least the connecting pieces, of which two or more are provided, lead into different chambers separated from one another by means of partitions.

In an advantageous embodiment, it is provided that a given in the width direction imaginary or physical (eg dividing wall) level is given in the (first) coolant tank, wherein at least two of these nozzles of the same type, so two outlet nozzle or two inlet nozzles, on different Sides of this imaginary or physical level are provided. It can also be provided that this plane is formed by a (longitudinal) partition wall, which is the case in an advantageous embodiment.

Such a (longitudinal) partition wall may extend continuously over the entire width of the respective coolant box.

It may also be provided that a plurality of longitudinal dividing walls are provided, which lie in the same plane, but are arranged offset from one another within this plane, and in particular are offset relative to one another in the width direction.

The heat exchanger or radiator is traversed in opposite directions of air. This is especially so that different, each flowing into the depth of the heat exchanger air currents are given, which are oriented differently. For corresponding conduction, appropriate air-guiding means may be provided which, for example - e.g. when integrated into an air conditioning system - can be provided by a ducting system.

According to the invention, a motor vehicle air conditioning system is also provided which has a heat exchanger according to the invention. This heat exchanger is advantageously designed as a radiator. Furthermore, a method for operating a heat exchanger of an automotive air conditioning system, such as radiator of a motor vehicle air conditioner, proposed, wherein the pipe block or rib block in a first portion of air in a first direction and in a first from the first - Cut different second section of air in a second, the first opposite direction is flowed through. The system of coolant boxes and tubes or flat tubes is thereby flowed through by a coolant, wherein the heat transfer between the coolant and the air takes place both in the first section and in the second section of the pipe or pipe / rib block according to the cross-countercurrent principle ,

It can be provided that the heat transfer between the coolant and the air takes place in a third, different from the first portion and the second portion portion of the pipe or tube / fin block on the cross-flow principle. This third section may be traversed in the direction of air, in which the air flows through the first section, or in the direction in which the air flows through the second section, or in different sections in opposite or opposite directions. The third section is preferably located between the first and second sections.

Fig. 1 shows a first embodiment of a heat exchanger according to the invention, which may be part of an exemplary air conditioning system according to the invention, in a schematic representation;

FIG. 2 shows the design according to FIG. 1 in a partially exploded view; FIG. and

FIGS. 3 a to 3 c show a second exemplary embodiment of a heat exchanger according to the invention which is similar to the first exemplary embodiment

Part of an exemplary air conditioning system according to the invention can, in a schematic representation. 1 to 3c show an exemplary inventive heat exchanger devices 1 (in short: heat exchanger 1), which is designed here in each case as a radiator device 1 (in short: radiator 1), in various schematic views. This radiator 1 is part of an exemplary, inventive air conditioning system in an advantageous embodiment. Such an exemplary air conditioning system according to the invention can, for example, in addition to the radiator 1 shown by way of example in FIGS. 1 to 3 have an evaporator. In an advantageous development, such an air conditioner additionally has a condenser. It may also be provided that such an air conditioning system has an expansion valve.

The heating element 1 is arranged in a preferred embodiment downstream of the evaporator. Alternatively, however, it can also be provided that the radiator is arranged parallel to the evaporator or is connected.

The radiator 1 has a first - in the figures upper - coolant box 10, and a second - lower in the figures - coolant box 12. The first coolant box 10 is connected to the second coolant box 12 via a plurality of tubes 14, here as flat tubes are formed. These flat tubes 14 may for example be folded or welded or made in other ways. The flat tubes are formed in this embodiment as two-chamber tubes or as two-channel tubes. For example, they can consist of two single or one combined tube. This is in particular such that they form two channels, in particular two continuously extending substantially straight extending channels 16,18. The first, here upper coolant box 10 of the two coolant boxes 10, 12 here has a longitudinal partition wall 20, which extends here over the entire width of the first coolant box 10 and the interior of this coolant box 10. In the first - here upper - coolant box 10, two transverse partitions 22, 24 are also provided.

The two transverse dividing walls 22, 24 extend on opposite sides of the longitudinal dividing wall 20. The transverse dividing walls 20, 24 extend essentially parallel to each other. Seen transverse to their extension direction or in the width or longitudinal direction of the first coolant box 10, the two transverse partition walls 22, 24 are arranged offset from one another.

The longitudinal partition wall 20 is here designed and arranged such that it respectively separates the two chambers 16, 18 of the flat tubes 14 from each other. It is provided that the flat tubes 14 form a row of tubes 60. It is further provided that the channels 18 of the flat tubes 14 form a channel row 62 and the respective other channels 16 of the flat tubes 14 form a further channel row 64.

The longitudinal dividing wall 20 is aligned such that it runs between the channel row 64 formed by the channels 16 and the channel row 62 formed by the channels 18 or separates these two channel rows 62, 64 from one another.

It should be noted that, in an alternative embodiment, a plurality of longitudinal dividing walls 20 arranged in series with a respective intermediate space in their longitudinal direction can also be provided. For example, it can be provided that, instead of a continuous longitudinal dividing wall 20, a first longitudinal dividing wall is provided, which extends substantially from a location lying in the longitudinal or width direction of the first coolant box 10 substantially or at least to the position at which the first transverse partition wall 22 is provided, and that another longitudinal partition wall is provided in this widthwise direction spaced from the first longitudinal partition wall extending from the widthwise longitudinal end of this first coolant box 10 at least to the position, where the second transverse partition 24 is given.

While in the design with continuous transverse partition wall 20 in the embodiment according to Figures 1 and 2 as well as in Figures 3a to 3c, a system is formed, is divided in the first coolant box 10 into four chambers 26, 28, 30, 32, in the second - previously mentioned - embodiment of this first coolant box 10 in only three Divided chambers, wherein compared to the four-chamber coolant box, the local chambers 26, 28 would form a common chamber.

According to the embodiments shown in the figures, the coolant boxes 10, 12 each have a tube bottom 34 and 38 and a lid 36 and 40, respectively. This is so here that the tube plate 34 on or on or in the lid 36 on one side of this cover 36 on or on or is attached and the tube sheet 38 in or on or on one side of the Cover 40 on or set up.

The tube plates 34 and 38 each have openings, here slot-shaped openings, for receiving a respective end of the flat tubes 14, so that the corresponding flat tubes 14 are inserted with their ends in the corresponding openings of the tubesheets.

The tubesheets 34 and 38 are soldered to the covers 36 and 40 associated therewith and the flat tubes 14 inserted into the tubesheets 34 and 38 are respectively soldered to these tubesheets 34 and 38, respectively.

It should be noted, however, that with respect to the first coolant box 10 and / or the second coolant box 12, the respective tube sheet 34 or 36 may also be omitted, and instead at the corresponding, the respective coolant box 10 and 12 facing side, the respective ends of Flat tubes 14 can be widened for a flat abutment. The adjoining flat tubes or flat tube end portions can be soldered together.

Between flat tubes 14 and between each adjacent flat tubes 14 tube interspaces 42 are formed for an air flow. It can be provided that 42 corrugated ribs are provided in these tube interspaces; such corrugated fins can be soldered, for example, with the respective adjacent tubes or flat tubes 14. Flowing air is indicated schematically in the figures by the arrows 44, which have transverse strips on the side facing away from their arrowhead. The coolant flow is indicated schematically in the figures and by the arrows 46 by way of example.

The flat tubes 14 are substantially aligned so that the respective planes spanned by them are located parallel to each other.

So they extend with the mentioned levels substantially transversely to the width direction of the heat exchanger or radiator. 1

The radiator 1 also has a plurality of openings 48, 50, 52, via which coolant can flow into the radiator 1 or from the radiator 1 or should, or wherein this takes place during operation. In the embodiments according to the figures, this is such that the openings 48, 50 are openings for the inflow of coolant and the opening 52 is an opening for the outflow of coolant.

In the region of the openings 48, 50, 52 or for these openings 48, 50, 52 connecting pieces 54, 56, 58 are formed. Thus, the connecting piece 54 is associated with the opening 48 for the inflow of coolant, the connecting piece 56 of the opening 50 for the inflow of coolant and the connecting piece 58 of the opening 52 for the outflow of coolant.

As can be clearly seen from the figures, the radiator device 1 has two inlets 70, 72 or two inlet openings 48, 58 or two connecting pieces 54, 56 for an inflow of coolant and a drain 68 or an opening 52 for the Outflow of coolant or a connection piece 58 for the flow of coolant. The number of inlets 70, 72 or inlet openings 48, 50 or connecting pieces 54, 56 for the inflow of coolant, which is "two" here by way of example, thus deviates from the number of outlets 68 or drainage openings 52 or connection piece 58 for the flow of coolant, which is "one" here by way of example. In the exemplary embodiments according to the figures, all of the mentioned inlets 70, 72 or inlet openings 48, 50 or connecting pieces 54, 56 for the inflow of coolant and all of the mentioned outflows 68 or drainage openings 52 or connecting stubs 58 for the outflow of coolant disposed on the first coolant box 10.

The second coolant box 12 is used in particular or in particular for a deflection of the coolant. In the embodiments, the coolant in the second coolant box 12 is deflected in depth. Furthermore, a certain deflection takes place in the width in the radiator device 1, which is particularly due to the fact that the two transverse partitions 22, 24 are arranged offset in the longitudinal direction or width direction of the first coolant tank 1 in the first coolant box. The second coolant box 12 in the embodiments shown in the figures is free of partitions arranged in its interior, i. In particular, free from longitudinal and transverse partitions.

As schematically indicated by the above-mentioned arrows 44, the heat exchanger or radiator 1 or its tube or tube / fin block 66 is flowed through during operation of air, partially in a first flow direction and partially in a second, the first opposite Flow direction flows. This is in particular such that in the width direction of the radiator 1, two-in particular adjacent-regions are formed, which are flowed through in opposite directions in the operation of air.

For generating or reaching this opposite air flow, a correspondingly suitable means for generating and / or directing air for an air flow through the radiator is provided, which is such that air the pipe block or pipe / rib block 66 in two different areas opposite flows through each other. Such a device may include one or more means for generating an airflow, such as fans, and / or means for directing air. It can be provided that the relative speed of the flow menden air to the device or to the heat exchanger 1 by the movement of a motor vehicle, in which this heat exchanger 1 is installed, is effected, and the addressed device thus has only means for directing or guiding air. These means for directing or guiding air can be formed, for example, by a type of duct system which is part of an air conditioning system. Thus, the air caused by the airstream or these forming air can be directed on the one hand, that it flows through the radiator from the "front" in a section and flows through the mentioned radiator 1 in another section of "back".

It can be provided that the different flow directions of the air in the region of the radiator 1 in the manner of a series connection are interconnected such that the air flows through the radiator 1 first in one direction and then in the other, opposite direction.

But it can also be provided that the air flowing through the radiator 1 in different directions is connected in the manner of a parallel connection, so that parallel flowing air streams in operation flow through the heat exchanger 1 in opposite directions.

The corresponding device is - as already mentioned - not explicitly shown in the figures, and in particular for reasons of clarity. In the embodiments according to the figures, the radiator 1 is divided so that up to the middle of the heating network, the air flows in one direction and mirror-symmetrically on the other side the air flows through the radiator 1 opposite. In this context, it should be noted, however, that of course a different type of division may be given, in particular an asymmetric type of division. In particular, it may be provided that the division of the areas through which air flows in different directions or opposite directions are adapted to individual conditions or requirements of the intended use. As mentioned, according to the embodiments according to the figures, a radiator 1, which has two coolant inlets 70, 72 and a coolant outlet 68. Alternatively, for example, be provided that such a radiator 1 has an inlet and two processes. In the embodiments shown in the figures, it is provided that the respective coolant outlet 68 or the opening 52 for the outflow of coolant or the connecting piece 58 for the discharge of coolant in the longitudinal direction or width direction of the radiator 1 between the two inlets 70th , 72 or inlet openings 48, 58 or connecting piece 54, 56 is arranged for an inlet of coolant.

The two inlets or connecting pieces 54, 56 or openings 48, 50 for the inlet of coolant open in the embodiments according to the figures on different sides of the longitudinal partition wall 20 and the plane thus formed in the first coolant box 10. Thus be on the one 54 of these two connecting pieces 54, 56 for the inlet of coolant channels 16 of a first 64 of the two channel rows 62, 64 of the channels 16, 18 of the flat tubes 14 supplied, and the other 56 of these two connecting pieces 54, 56 channels 18 of the other channel row 62nd the flat tubes 14 supplied with coolant. However, flat tubes are not supplied with coolant via the connecting pieces 54, 56 over the entire width of the radiator. As already mentioned here are two transverse partitions 22, 44 in the first, here upper, coolant box 10 additionally provided.

The already mentioned connecting piece 58 for the outflow of coolant, which can also be referred to as drain pipe 58, is arranged between the two transverse walls 22, 24, viewed in the longitudinal direction or width direction of the heat exchanger 1. This outlet pipe 58 is here arranged so that it extends in the depth direction of the heat exchanger 1 via the longitudinal partition wall 20 so that it or the opening thus formed in chambers 26, 28 opens, which are arranged on different sides of the longitudinal partition wall 20. In the respective, the respective same flat tube associated channels or chambers is in the region which is located in the width direction between the two transverse partition walls 22, 24, the flow direction in these two channels 16, 18 and chambers equal. As can be seen in FIG. 2, the direction of flow in the area addressed is such that it is directed in the direction of the downcomer.

In the region which is located outside the intermediate region between the two transverse partition walls 22, 24, viewed in the width direction, the flow direction in the two chambers or channels 16, 18 of the respective flat tubes 14 is different or the direction of flow in the in the depth arranged flat tubes opposite.

In the exemplary embodiments explained with reference to the figures, it is provided that the channels of the flat tubes 14, which, viewed in the flow direction, each face the inlet connection 54, 56, do not extend over the entire width of the heating element 1 and that the channels of the flat tubes 14, which are facing the discharge nozzle, are arranged so that along the entire width of such channels are given. This is so here that a section of the two channel rows 62, 64 is arranged overlapping and thus covers substantially the entire width of the radiator 1.

From the outside to the position of the transverse partition walls 22, 24 there is a cross-counterflow between the coolant in the flat tubes 14 and the air. Between the transverse partition walls 22, 24 - seen in the width direction of the radiator 1 - takes place a cross flow. In the embodiments according to the figures, however, this latter area is significantly lower.

According to the embodiments shown with reference to the figures, the accumulated flat tube cross-section, which is traversed before the coolant leaves the radiator 1, is greater than the accumulated flat tube cross-section, which is flowed through, after coolant has entered the radiator 1 is. In this case, the flat tube cross section through which the first coolant box 10 flows into the second coolant box 12 when coolant flows is less than the accumulated flat tube cross section through which coolant flows from the second coolant box 12 into the first coolant box 10 ,

As the exemplary embodiments show, the invention provides the basis for a large number of advantages, some of which are to be explained below by way of example, wherein it should be noted that not all of the embodiments according to the invention achieve all or more or at least one of these advantages got to. It is a cross counterflow allows, which is thermodynamically better than a DC cross-flow, in spite of different air flow direction. This in turn allows for higher performance. Furthermore, a variable distribution over the heat exchanger network is made possible, in particular adapted to the air flow. Moreover, no additional space of the heat exchanger is necessary. In known devices some areas are cross-connected in the DC cross, which represents a performance penalty in contrast to the cross countercurrent. The heat exchangers explained with reference to the figures can be used for all possible heat exchangers, provided that a deflection takes place at depth.

In particular, it is provided that the volumetric flow in the interior of the air direction is adapted in such a way that there is always cross countercurrent or, if appropriate, sections of additional crossflow.

The designs of a heat exchanger 1 shown in FIGS. 1 to 3c can be designed, for example, as a soldering construction. For example, they can be solder-plated and soldered in a soldering oven during production.

It should be noted that the heat exchangers 1 shown in the figures are used for carrying out an exemplary method according to the invention. can be. From the above description, there are also developments of such a method according to the invention.

Claims

Patent claims

1. Heat exchanger device for a motor vehicle air conditioner, in particular radiator device (1) for a motor vehicle air conditioning, which Wärmeübertrager- device (1) a first coolant box (10) and one of this first coolant box (10) spaced second coolant box ( 12), as well as a plurality of tubes (14), by means of which the first coolant box (10) and the second coolant box (12) are fluidly connected, between these tubes (14) tube intermediate spaces (42) are formed for an air flow .

characterized in that

the coolant boxes (10, 12) with the said coolant boxes (10, 12) fluidly connecting tubes (14) for the formation of a given in an air flow in a first portion of the pipe or tube / fin block (66) between pipe spaces (42) an at the same time oppositely directed air flow of the given in a second portion of this pipe or tube / fin block (66) pipe interspaces (42) are formed in this first portion and this second portion each acting on the cross countercurrent principle heat exchanger.

2. Heat exchanger device according to claim 1, characterized in that the heat exchanger device (1) has a device For producing and / or conducting of the heat exchanger (1) in operation in different sections of its pipe or tube / fin block (66) at the same time in opposite orientations flowing through air streams.

3. Heat exchanger device according to claim 2, characterized in that the means for generating and / or conduction of the heat exchanger (1) in operation in different sections of its pipe or tube / fin block (66) at the same time in opposite directions orientated by flowing air streams is formed such that the tube or tube / rib block (66) are simultaneously connected in parallel in opposite orientations or directions flowing air streams.

4. Heat exchanger device according to the preamble of claim 1, in particular according to one of the preceding claims, characterized in that, in particular on the same coolant box (10), at least one connecting piece (54, 56) for the inflow of coolant and at least one connecting piece (58) is provided for the outflow of coolant, wherein the number of the connecting piece (54, 56) for the inflow of coolant from the number of or the connecting piece (58) for the outflow of coolant deviates.

5. Heat exchanger device according to claim 4, characterized in that exactly two connecting pieces (54, 56) is provided for the inflow of coolant and exactly one connecting piece (58) for the outflow of coolant, wherein this particular to the same coolant box (10 ) are provided.

6. Heat exchanger device according to one of the preceding claims, characterized in that characterized in that the number and / or the accumulated, in particular average, flow cross-section of the or the Anschlussstut- zen (54, 56) for the inflow of coolant-facing channels of the flat tubes (14) is smaller than the number and / or the accumulated, in particular average, flow cross section of the or the connecting piece (58) for the outflow of coolant.

7. Heat exchanger device according to one of the preceding claims, characterized in that the heat exchanger device (1) in addition to the training given by means of the first and the second portion of the pipe or pipe / fin block (66) for a Heat transfer according to cross-countercurrent principle by means of one of the first and second portions of the pipe or tube / rib block (66) different third portion of the tube tube or rib-tube (66) is designed for cross-flow heat transfer.

8. Heat exchanger device according to one of the preceding claims, characterized in that in the first coolant box (10) at least one longitudinal dividing wall (20) is given.

9. heat exchanger device according to claim 8, characterized in that a connecting piece (58) for the outflow of coolant into the first coolant box (10) opens, that it over its opening cross section in on different sides of the longitudinal partition (20) arranged chambers ( 26, 28) of the first coolant box (10) opens.

10. Wärmeübertrager- device according to one of the preceding claims, characterized in that in the first coolant box (10) two in the width or longitudinal direction of this first Kühlmittel- box (10) spaced-apart transverse partitions (22, 24) are provided.

11. Wärmeübertrager- device according to claim 10, characterized in that the connecting piece (58) for the outflow of Kühlmit- Tel - in the widthwise or longitudinal direction of this first coolant box (10) seen - between these two transverse partition walls (22, 24) in the first coolant box (10) opens.

12. An air conditioner for motor vehicles with a Wärmeübertrager- device (1) according to one of the preceding claims.

13. The air conditioner according to claim 12, characterized in that said air conditioner comprises an evaporator and a heater formed by said heat transfer device (1).

14. A method for operating a heat exchanger (1), in particular radiator, a motor vehicle air conditioning, which heat exchanger (1) two spaced apart, via a plurality of tubes ren (14), in particular flat tubes (14) fluidly connected coolant boxes ( 10, 12), between the tubes (14) tube intermediate spaces (42) are formed for an air flow, and in particular for operating a heat exchanger (1) according to one of claims 1 to 11, with the, in particular equal time or overlapping in time performed, steps:

Applying coolant, so that the system of coolant boxes (10, 12) and flat tubes (14) is flowed through by this coolant;

- Applying air such that the of the coolant boxes (10, 12) fluidly connecting pipes (14) formed

Pipe block (66) or one of these tubes (14) and formed in the inter-tube spaces (42) formed between corrugated ribs formed pipe / fin block (66) is flowed through in a first portion of air in a first direction and in one of these first section different second

a portion of air flows through in a second direction opposite to the first direction; wherein the heat transfer between the coolant and the air occurs both in the first section and in the second section according to the cross-countercurrent principle.