DE102006035994A1 - 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 - Google Patents

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

The The invention relates to an automotive air conditioning system, a heat exchanger, especially radiators, for one Such automotive air conditioning system, and a method of operation a heat exchanger an automotive air conditioning system.

Heat exchanger are common designed so that, if a diversion of the gas or fluid inside the tubes takes place in depth, the flow direction the heat exchanger flowing through Air, over the entire heat exchanger network is equal to.

Becomes the volume flow on the inside of a heat exchanger deflected in depth, So this happens in previously known embodiments of the entire heating network throughout.

In the rule is the flow direction the air through the heat exchanger network in the known heat exchangers such that the volume flow inside the tubes with respect to the flowed through air a cross counterflow represents or causes. This is also thermodynamically appropriate since the air in this way in the design as a radiator, the highest or a high or in the embodiment as the evaporator the lowest or a small desired Outlet temperature reached.

For certain use cases However, it may be appropriate or even necessary, the heat exchanger, specifically the heat exchanger network, "split" and under different Airstreams to flow through.

An example of such an embodiment is in DE 100 57 039 A1 (see in particular 3 ) disclosed. 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.

Of the The invention is based on the object, a powerful heat exchanger to create, and in particular a powerful heat exchanger, which turns out to be a radiator for air conditioning a motor vehicle can be used.

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

According to the invention will now in particular a heat exchanger device for one Automotive air conditioning system proposed, for example, as a radiator device for one Automotive air conditioning system is formed. The heat exchanger device has a first coolant box and one of this first coolant box spaced second coolant box on. Furthermore, the heat exchanger device a variety of tubes, for example, as flat tubes are formed and by means of which the first coolant box and the second Coolant tank aerodynamically are connected. It can be provided that these tubes, the may be formed in particular as flat tubes, aligned parallel to each other are. It can be provided that the opposing End faces of these flat tubes are open and formed between These end faces in each case a continuous, straight channel in the Pipes is formed.

It is provided in particular that the flat tubes are arranged to each other are that they have pipe spaces for one Form air flow. In an expedient development is provided that provided in such pipe interstices corrugated fins are. The arrangement of the tubes thus forms a tube block or From the arrangement of pipes and corrugated fins is a tube / rib block educated.

The Coolant boxes with the flow of these coolant boxes connecting pipes are for the formation of a - at an air flow in a first section of the tube or tube / fin block given pipe spaces and at the same time oppositely directed air flow of the in a second section of this pipe or pipe / rib block given pipe interspaces - in this both sections, i. in the first and in the second section, respectively formed according to the cross counterflow principle acting heat exchanger.

The Tubes or flat tubes can Also have a plurality of channels formed parallel to each other.

The Tubes or flat tubes can For example, be arranged so that they have a (flat) tube row form. It can also be provided that the tubes or flat tubes are arranged so that they are arranged several parallel to each other Form (flat) tube rows.

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

It is particularly provided that the tubes or flat tubes to each other are arranged to form pipe spaces for air flow. In an expedient embodiment is provided that provided in such pipe interstices corrugated fins are.

Provided several rows of tubes or channel rows are provided, can be provided be that for each these pipe or channel rows are provided separate corrugated fins, or it may be provided that for these pipe or channel rows common corrugated ribs are provided.

In expedient embodiment is provided that all Zulaufstutzen, of which in an appropriate embodiment of one or several are provided, and all Drain sockets, of which in an appropriate embodiment also one or more are provided on the same coolant box are arranged or open into the same coolant box.

In advantageous embodiment is provided that the heat exchanger is designed so that the media flowing through it at least in one Section cause a cross counterflow and in at least one Section a cross-flow. It is especially provided that the heat exchanger is designed so that it does not despite differently oriented air flow causes both a cross countercurrent and a cross dc or can cause.

At least one of the two coolant boxes is in an advantageous embodiment by means of one or more partitions in several Divided into chambers. In a particularly advantageous embodiment is thereby provided that the number of inlet nozzles on the number of Drain nozzle deviates. In particular, in such an embodiment, where the number of inlet nozzles of the number of outlet nozzles deviates and at the all this neck into the same coolant box lead, is inevitable provided that either at least two drain sockets or at least two inlet nozzles are provided. In a particularly advantageous embodiment It is provided that at least the nozzle, of which two or more are provided, in different, by means of partitions from each other separate chambers open.

In Advantageous development is provided that one in the width direction given imaginary or physical (e.g., bulkhead) level in the (first) coolant box, where at least two of these nozzles of the same kind, so two Outlet nozzle or two inlet nozzles, on different sides this imaginary or physical Level are provided. It can also be provided that these Level formed by a (longitudinal) partition becomes what is the case in an advantageous embodiment.

A such (longitudinal) partition can be over continuously extend the entire width of the respective coolant box.

It can also be provided that a plurality of longitudinal partitions are provided, which in the same level, but offset within that level are arranged to each other, in particular in the width direction offset from one another.

Of the Heat exchanger or radiator is traversed in opposite directions of air. This in particular, is that different, each in depth of the heat exchanger flowing airflows are given, which are oriented differently. To the corresponding Can conduct appropriate Air guiding means may be provided, for example -. at Integration into an air conditioning system - provided by a duct system can be.

The invention is further an automotive air conditioning system is provided which is a heat exchanger according to the invention having. This heat exchanger is advantageously designed as a radiator.

Further is a method of operating a heat exchanger of a motor vehicle air conditioning system, like radiators an automotive air conditioning system, proposed in which the pipe or pipe / rib block in a first section of air in a first Direction and in a different from the first section second Section of air in a second, the first opposite Flowed through becomes. The system of coolant boxes and Pipes or flat tubes is flowed through by a coolant, wherein the heat transfer between the coolant and the air in both the first section and the second section the pipe or pipe / rib block according to the cross-countercurrent principle he follows.

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 can 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.

1 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;

2 the design according to 1 in a partial exploded view; and

3a to 3c a second embodiment of 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.

The 1 to 3c show an exemplary heat transfer device according to the invention 1 (in short: heat exchanger 1 ), each here as a radiator device 1 (in short: radiator 1 ), in various schematic views. This radiator 1 is part of an exemplary, inventive air conditioning in an advantageous embodiment. Such an exemplary air conditioning system according to the invention, for example, in addition to the example in the 1 to 3c shown radiator 1 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 radiator 1 is arranged in a preferred design 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 on, as well as a second - in the figures lower - coolant box 12 , The first coolant box 10 is with the second coolant box 12 over a variety of pipes 14 connected, which are designed here as flat tubes. These flat tubes 14 For example, they may be folded or welded or otherwise made. 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 the two coolant box 10 . 12 here has a longitudinal partition wall 20 on, here on the entire width of the first coolant box 10 or the interior of this coolant box 10 extends. In the first - here upper - coolant box 10 are also two transverse partitions 22 . 24 intended.

The two transverse partitions 22 . 24 extend on opposite sides of the longitudinal dividing wall 20 , The transverse partitions 20 . 24 extend substantially parallel to each other. Transverse to its direction of extension or in the width or longitudinal direction of the first coolant box 10 seen are the two transverse partitions 22 . 24 staggered to each other.

The longitudinal partition 20 is here designed and arranged so that they each have the two chambers 16 . 18 the flat tubes 14 fluidically separated from each other. It is envisaged that the flat tubes 14 a row of pipes 60 form. It is further provided that the channels 18 the flat tubes 14 a channel row 62 form and the other channels 16 the flat tubes 14 another channel row 64 form.

The longitudinal partition 20 is aligned so that they are between that of the channels 16 formed channel row 64 and that of the channels 18 formed channel row 62 runs or these two channel rows 62 . 64 separates each other.

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

While in the design with continuous transverse partition 20 in the embodiment according to the 1 and 2 as well as in the 3a to 3c a system is formed at the first coolant box 10 in four chambers 26 . 28 . 30 . 32 is divided in the second - previously mentioned - embodiment of this first coolant box 10 divided into only three chambers, where in 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 one tube bottom each 34 respectively. 38 as well as a lid 36 respectively. 40 on. This is here so that the tubesheet 34 on or on or in the lid 36 on one side of this lid 36 on or is attached or attached and the tube sheet 38 in or on or on one side of the lid 40 on or is attached or attached.

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

The tube sheets 34 respectively. 38 are there with each associated lids 36 respectively. 40 soldered and into the tube sheets 34 respectively. 38 used flat tubes 14 are each with these tubesheets 34 respectively. 38 soldered.

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

Between flat tubes 14 or between each adjacent flat tubes 14 become pipe spaces 42 designed for an air flow. It can be provided that in these tube spaces 42 Corrugated ribs are provided; Such corrugated ribs can, for example, with the respective adjacent tubes or flat tubes 14 be soldered.

Pouring air is schematically in the figures by the arrows 44 indicated that have on the side facing away from their arrowhead side strips. The coolant flow is schematic in the figures and by way of example by the arrows 46 indicated.

The flat tubes 14 are essentially oriented in such a way that their respective planes are parallel to each other.

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

The radiator 1 also has several openings 48 . 50 . 52 on, about which coolant in the radiator 1 to or from the radiator 1 can flow or should, or wherein this takes place during operation. In the embodiments according to the figures, this is such that the openings 48 . 50 There are openings for the inflow of coolant and the opening 52 is an opening for the drainage of coolant.

In the area of the openings 48 . 50 . 52 or for these openings 48 . 50 . 52 become connecting pieces 54 . 56 . 58 educated. That's the connection piece 54 the opening 48 assigned to the inflow of coolant, the connecting piece 56 the opening 50 for the inflow of coolant and the connecting piece 58 the opening 52 for the drain of coolant.

As the figures can be seen well, the radiator device 1 two feeds 70 . 72 or two inlet openings 48 . 58 or two connecting pieces 54 . 56 for an inlet of coolant on and a drain 68 or an opening 52 for the outflow of coolant or a connecting piece 58 for the drainage of coolant. The number of feeds 70 . 72 or inlet openings 48 . 50 or connecting piece 54 . 56 for the inflow of coolant, which is "two" by way of example here, thus deviates from the number of processes 68 or discharge openings 52 or connecting piece 58 for the flow of coolant, which is exemplified here "one" from.

In the embodiments according to the figures, all of the mentioned inlets 70 . 72 or inlet openings 48 . 50 or connecting piece 54 . 56 for the supply of coolant and all of the mentioned processes 68 or discharge openings 52 or connecting piece 58 for the flow of coolant to the first coolant box 10 arranged.

The second coolant box 12 serves in particular or in particular for a deflection of the coolant. In the embodiments, the coolant in the second coolant box 12 deflected in the depth. Further, found in the radiator device 1 a certain deflection takes place in the width, which is due in particular to the fact that the two transverse partitions 22 . 24 in the first coolant box 10 in the longitudinal or width direction of the first coolant box 1 are arranged offset. The second coolant box 12 is in the embodiments shown in the figures free of arranged in its interior partitions, ie in particular free of longitudinal and transverse partitions.

As by the already mentioned arrows 44 indicated schematically, the heat exchanger or radiator 1 or its tube or tube / rib block 66 in the operation of air through flows, which flows partly in a first flow direction and partially in a second, the first opposite flow direction. This is especially so that in the width direction of the radiator 1 two - in particular adjacent - areas 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 flows through in two different areas opposite to 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 velocity of the strö coming 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 wind or forming this air can be directed on the one hand, that it flows through the radiator from the "front" in a section and the addressed radiator 1 flows through in another section of "behind".

It can be provided that the different flow directions of the air in the region of the radiator 1 connected in the manner of a series circuit with each other such that the air to the radiator 1 flows first in one direction and then in the other, opposite direction.

But it can also be provided that the radiator 1 air flowing in different directions is connected in the manner of a parallel connection, so that parallel flowing air streams in operation the heat exchanger 1 to flow 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 divided so that up to the middle of the heating network, the air flows in one direction and mirror-symmetrical on the other side, the air opposite through the radiator 1 flows. 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 by 1 shown the two coolant inlets 70 . 72 and a coolant drain 68 has. 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 local 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 70 . 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 or the plane formed thereby in the first coolant box 10 , Thus, over the one 54 these two connecting pieces 54 . 56 for the intake of coolant channels 16 a first 64 the two channel rows 62 . 64 of the channels 16 . 18 the flat tubes 14 supplied, and over the other 56 these two connecting pieces 54 . 56 channels 18 the other channel row 62 the flat tubes 14 supplied with coolant. Over the connecting pieces 54 . 56 However, flat tubes are not supplied with coolant 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 connection piece 58 for the drainage of coolant, which also serves as a drain pipe 58 can be referred to, is - in the longitudinal direction or width direction of the heat exchanger 1 seen - between the two mentioned transverse walls 22 . 24 arranged. This drain neck 58 is here arranged so that it is in the depth direction of the heat exchanger 1 over the longitudinal partition 20 so that it or the opening formed thereby in chambers 26 . 28 opens on different sides of the longitudinal partition wall 20 are arranged.

In the respective, respectively the same flat tube associated channels or chambers is in the area in the width direction between the two transverse partitions 22 . 24 is located, the flow direction in these two channels 16 . 18 or chambers equal. How well 2 refer to is the flow direction in the addressed area so that it is directed in the direction of the downcomer.

In the area outside the intermediate area between the two transverse partitions 22 . 24 - Seen in the width direction - is located, the flow direction in the two chambers or channels 16 . 18 the same flat tubes 14 different or the flow direction in the flat tubes arranged in the depth is opposite.

In the embodiments explained with reference to the figures, it is provided that the channels of the flat tubes 14 , which - seen in the flow direction - each of the inlet nozzle 54 . 56 facing, not over the entire width of the radiator 1 extend 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 here so that a section of the two channel rows 62 . 64 is arranged overlapping and thus substantially the entire width of the radiator 1 covered.

From outside to the position of the transverse partitions 22 . 24 exists between the coolant in the flat tubes 14 and the air a cross counterflow. Between the transverse partitions 22 . 24 - in the width direction of the radiator 1 seen - 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, the radiator 1 leaves, larger than the accumulated flat tube cross section, which is flowed through, after coolant into the radiator 1 occurred. This is so here that the flat tube cross-section, the flow of coolant from the first coolant box 10 in the second coolant box 12 is flowed through, is less than the accumulated flat tube cross-section, which is flowed through, when coolant from the second coolant box 12 in the first coolant box 10 flows.

As the embodiments show, the invention provides the basis for a variety of benefits some of which are exemplified below It should be noted that not in each embodiment of the invention all or more or at least one of these benefits can be achieved got to. It becomes a cross counterflow allows usually thermodynamically better than a DC cross-flow is, in spite of different air flow direction. this makes possible again a higher one Power. Furthermore, a variable distribution over the heat exchanger network is made possible, and in particular adapted to the air flow. Moreover, no additional Space of the heat exchanger necessary. In known devices, some areas are cross-current interconnected, which represents a performance penalty in contrast to the cross countercurrent. The explained with reference to the figures Heat exchanger are for all possible heat exchangers can be used, provided that a deflection takes place in the depth.

It iost provided in particular that the volume flow inside the Direction of air flow is adjusted so that always cross counterflow - or possibly in sections additionally Cross current - given is.

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

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

Claims (14)

Heat exchanger device for a motor vehicle air conditioner, in particular radiator device ( 1 ) for an automotive air conditioning system, which heat exchanger device ( 1 ) a first coolant box ( 10 ) and one of this first coolant box ( 10 ) spaced second coolant box ( 12 ), and a plurality of tubes ( 14 ), by means of which the first coolant box ( 10 ) and the second coolant box ( 12 ) are fluidically connected, wherein between these tubes ( 14 ) Tube interspaces ( 42 ) are designed for an air flow, characterized in that the coolant boxes ( 10 . 12 ) with which these coolant boxes ( 10 . 12 ) fluidically connecting pipes ( 14 ) for the formation of an air flow in a first section of the pipe or pipe / rib block ( 66 ) given pipe interspaces ( 42 ) and at the same time an oppositely directed air flow in a second section of this pipe or tube / rib block ( 66 ) given pipe interspaces ( 42 ) are formed in this first portion and this second portion each acting on the cross-countercurrent principle heat exchanger. Heat exchanger device according to claim 1, characterized in that the heat transfer device ( 1 ) means for generating and / or conducting the heat exchangers ( 1 ) in operation in different sections of its tube or tube / fin block ( 66 ) at the same time in opposite orientations flowing through air streams. 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 tube or tube / fin block ( 66 ) is formed at the same time in opposite orientations by flowing air streams such that the pipe or pipe / rib block ( 66 ) are simultaneously connected in parallel in opposite orientations or directions through flowing air streams. 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 or the connecting piece ( 54 . 56 ) for the inflow of coolant from the number of or the connecting piece ( 58 ) deviates for the outflow of coolant. Heat exchanger device according to claim 4, characterized in that exactly two connecting pieces ( 54 . 56 ) for the inflow of coolant and exactly one connecting piece ( 58 ) is provided for the outflow of coolant, which in particular on the same coolant box ( 10 ) are provided. Heat exchanger device according to one of the preceding claims, 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 one or more connecting pieces ( 58 ) is for the outflow of coolant. Heat exchanger device according to one of the preceding claims, characterized in that the heat exchanger device ( 1 ) in addition to the first and second sections of the pipe or pipe / fin block ( 66 ) for cross-flow heat transfer by means of one of the first and second sections of the pipe or pipe / fin block ( 66 ) various third section of the tube or tube / fin block ( 66 ) is designed for heat transfer according to the cross-flow principle. Heat exchanger device according to one of the preceding claims, characterized in that in the first coolant box ( 10 ) at least one longitudinal partition wall ( 20 ) given is. Heat exchanger device according to claim 8, characterized in that a connecting piece ( 58 ) for the outflow of coolant in the first coolant box ( 10 ) opens on its different sides of the longitudinal partition wall ( 20 ) arranged chambers ( 26 . 28 ) of the first coolant box ( 10 ) opens. Heat exchanger 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 coolant box ( 10 ) spaced apart transverse partitions ( 22 . 24 ) are provided. Heat exchanger device according to claim 10, characterized in that the connecting piece ( 58 ) for the outflow of Kühlmit tel - in the width or longitudinal direction of this first coolant box ( 10 ) - between these two transverse partitions ( 22 . 24 ) in the first coolant box ( 10 ) opens. Airconditioning system for motor vehicles with a heat exchanger device ( 1 ) according to one of the preceding claims. Air conditioner according to claim 12, characterized in that said air conditioning system comprises an evaporator and one of said heat exchanger device ( 1 ) has trained radiator. Method for operating a heat exchanger ( 1 ), in particular radiator, an automotive air conditioning system, which heat exchanger ( 1 ) two spaced apart, over a plurality of tubes ( 14 ), in particular flat tubes ( 14 ), fluidically connected coolant boxes ( 10 . 12 ), wherein between the tubes ( 14 ) Tube interspaces ( 42 ) are designed 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 carried out simultaneously or temporally overlapping, steps: - Applying coolant, so that the system consists 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 ) fluidically connecting pipes ( 14 ) formed tube block ( 66 ) or one of these tubes ( 14 ) and in the intermediate tube spaces ( 42 ) provided world ribs trained tube / rib block ( 66 flowing through in a first portion of air in a first direction and in a different from this first portion second - a portion of air in a direction opposite to the first direction second direction is flowed through; 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.