DE102005048838A1 - Heat exchanger for e.g. vehicle, with grid including parallel tubes and three connection headers, has single collection chamber with two groups of tubes connected to it - Google Patents

Abstract

The second connection header (22) encloses a single collection chamber (220), to which both the first group of tubes (31) and the second group of tubes (32) are connected. Connection cross sections of both groups of tubes lie opposite each other in the second collection chamber (220). Associated tubes of the groups which lie opposite each other, have differing internal contours or are differently spaced from further tubes of the same group. Each group has tubes of differing cross sections. Tube distributions and flows may differ.

Description

The The invention relates to a heat exchanger with the features of the preamble of claim 1.

A generic heat exchanger is from the DE 91 11 412 U1 known. Such a heat exchanger has a heat exchanger grid, in which pipes arranged parallel to one another are provided, which guide the heat exchange medium through the heat exchanger grid. In a generic heat exchanger, the heat exchanger has three junction boxes, wherein a first group of pipes in the heat exchanger grid connect a first junction box with a second junction box and another group of pipes connect the second junction box with a third junction box. The disclosed heat exchanger is intended with the two pipe groups for use with two separate media circuits and has for this purpose in the second junction box on two separate plenums.

task The invention is a heat exchanger to create, which in the heat exchange mode on the area its heat exchanger grid one well tunable temperature stratification of the outflowing air allows.

The Task is performed by a heat exchanger solved with the features of claim 1. Such a heat exchanger has a heat exchanger grid on, which penetrates parallel to each other arranged pipes is. These parallel tubes are in two groups of tubes articulated, wherein a first pipe group a first junction box of the heat exchanger with a second junction box and the second pipe group the second Connection box with a third junction box of the heat exchanger combines. about the connection boxes be the two tube groups of the heat exchanger with a heat exchange medium supplied, which over the tubes of the tube group passed through the heat exchanger grid becomes.

Around by means of a possible simple design a heat exchanger to provide a well tunable temperature stratification of outflowing Air of the heat exchanger grille has, the second junction box of the heat exchanger is designed such that it limits only a single collection space to which both the first tube group and the second tube group of the heat exchanger are connected. Thus it is possible with the first and the second tube group of the heat exchanger two areas of the heat exchanger grid to provide which different air and / or medium side Heat exchange properties exhibit. This can be over different properties or structures of the air duct and / or the media guide the two tube groups can be achieved. In contrast to the medium side run separately Flooding of two identically structured tube groups of a heat exchanger can in such a heat exchanger both floods interspersed evenly so that control effort to set a temperature stratification by different loading of the different heat ranges of the heat exchanger grille eliminated.

The through the second, central terminal box divided into two areas Heat exchanger surface can by appropriate design and design of the airside, and the medium-side structure of the heat exchanger grille, respectively the associated Tubes in a simple way to set a desired temperature stratification be designed or designed. Thus, for the design of temperature stratifications in the heat exchanger grid on the air side Structures of the heat exchanger grid the different pipe groups different flow cross sections in the air or have differently designed slats.

at a special embodiment of the heat exchanger are the connection cross-sections the two pipe groups in the plenum of the second, middle junction box opposite each other arranged. As a result, the medium-side flow resistance of the heat exchanger be minimized. The minimization of the medium-side flow resistance of the heat exchanger is in particular at freely opposite connection cross-sections the two tube groups in the collection space given. For a special design of temperature stratifications in the heat exchanger grid the plenum of the middle junction box can also deflect or have guide devices for the flow of the medium, which, for example, the flow affect adjacent pipes.

In a particular embodiment of the heat exchanger mutually associated pipes of the two pipe groups are designed differently. Associated pipes of the two pipe groups are, for example, in the second collecting chamber with their connection cross sections each other substantially oppositely arranged pipes. In this case, the mutually associated tubes, for example, different inner line contours or different distances or distributions to the other tubes of the same Chen tube group, which in a particularly simple manner, the heat-absorbing properties of belonging to these tubes areas of the heat exchanger grid and thus the associated temperature stratification is interpretable.

A special embodiment of the heat exchanger has tubes with different tubes in the two tube groups Cable cross sections on. This can be done over the associated different flow rates the medium or consequent different turbulence training in the flow cross-section the medium in a particularly effective and simple way the heat exchange properties or temperature stratification properties of the associated areas of the heat exchanger grid shape.

The different pipe cross sections of the pipes can thereby by different inner and outer dimensions of the tubes or for example at same external dimensions of the Pipes by additional internal devices or wall sections of the tubes are designed. Especially with flat tubes, there is the possibility for the same outer dimensions increased heat exchange rates by an increased number to reach floods in the flat tube.

Around in a particularly simple manner, the air-side Wärmetauscheigenschafen in the heat exchanger grille different or even around the air flow side Compensation for different cable cross-sections of the tubes of the two tube groups to enable has an embodiment of the heat exchanger each differently distributed pipes of the two pipe groups.

A special embodiment of the heat exchanger has a heat exchanger grid on, which is provided with tubes that at least partially several Have floods. In particular, assigned to each other, for example, in the second collection space each opposite each other arranged pipes of the two pipe groups different numbers from floods up. Especially with flat tube heat exchangers can over the number the floods the degree of heat exchange and thus the associated outflow the air in the local area of the heat exchanger grille designed become.

Further advantageous embodiments of the invention will become apparent from combinations embodiments described above, as well as from the drawing and its description. In the drawing is an embodiment a heat exchanger shown.

there demonstrate:

1 a partially drawn sectional view of a heat exchanger with a cutting plane parallel to the planar extension of the heat exchanger grille,

2 a sectional view of a tube of a first tube group and

3 a sectional view of a pipe of a second pipe group.

1 shows a partially sectioned sectional view of a heat exchanger 1 with a view transverse to the flat extension of the heat exchanger grid. The sectional plane is aligned parallel to the planar extension of the heat exchanger grid. The heat exchanger 1 has the heat exchanger grid passing through, parallel aligned pipes. Furthermore, the heat exchanger 1 three junction boxes on which the pipes of the heat exchanger grille are connected heat exchange medium side. In this case, the heat exchanger 1 a first connection box 21 on, at the collection room 210 a first pipe group 31 is connected by parallel aligned tubes. The pipes of the pipe group 31 are at their end, that is the junction box 21 opposite angeorndet, at a second junction box 22 attached and to the collection room 220 connected. On the connection cross sections of the pipe group 31 opposite side of the plenum 220 of the second junction box 22 is a second pipe group 32 of the heat exchanger 1 at the second collection box 22 attached and to the collection room 220 connected. With the second connection box 22 opposite end are the tubes of the second tube group 32 at a third collection box 23 of the heat exchanger 1 attached and to the collection room 230 connected. Between the tubes designed as a flat tubes of the heat exchanger 1 are introduced and fixed to improve the heat exchange properties wavy curved blades.

The heat exchange medium side line structure of the heat exchanger thus has three headers 21 . 22 and 23 on, which through the two tube groups 31 and 32 each interconnected. Here are the second, middle connection box 22 both pipe groups 31 and 32 connected. The collection box 22 has a single collection room 220 on which both the first tube group 31 as well as the second pipe group 32 are connected. The connection cross sections of the pipe groups are 31 and 32 at the collecting box 22 arranged substantially opposite each other. It can thus be a direct and free inflow to the heat exchange medium laxative tube group of the two tube groups 31 and 32 from the collection room 220 take place from the heat exchange medium feeding tube group forth. This is a particularly low-resistance flow through the heat exchanger 1 allows. Furthermore, by the separate connection of the two pipe groups on the common collection box 22 different medium- or air-side heat exchanger grid structures are created. As a result, the heat exchange properties of the respectively associated region of the heat exchanger grille and thereby temperature stratifications over the associated surface areas of the heat exchanger grille are structurally interpretable and shapable.

2 shows a sectional view corresponding to the section II-II 1 , Here, the section is only partially over the cross section of one of the parallel aligned tubes of the tube group 31 shown. The pipes of the pipe group 31 are formed as flat tubes, which essentially have a support wall for stabilizing the tube inner cross section in the middle region.

3 shows one on the cross section of a tube of the tube group 32 limiting sectional view of the section III-III 1 in which the pipe group 32 is shown in section. The pipes of the pipe group 32 are just like the tubes of the tube group 31 designed as flat tubes and have the same outer dimensions as their tubes. The pipes of the pipe group 32 have in contrast to the tubes of the tube group 31 However, four inner walls to support the inner tube cross section. As a result, with the same media mass flow, an additional increase in the flow rate of the tubes of the tube group 32 compared to the tubes of the tube group 31 achieved with an inner support wall. The resulting increased heat transfer between heat exchange medium and heat exchanger tube causes an improved degree of heat exchange in the tubes of the tube group 32 and thus throughout the tube group 32 formed area of the heat exchanger grid of the heat exchanger 1 , Thus, the heat exchanger 1 with uniform flow of the heat exchanger grille with air, a range of lower air outlet temperatures in the pipe group 31 formed region of the heat exchanger grid, and having a higher air outlet temperatures, from the tube group 32 formed area of the heat exchanger grid.

As a result, with uniform flow through the heat exchanger 1 With air and heat exchange medium, a temperature stratification in the areal extent of the heat exchanger grid can be achieved. The temperature stratification over the design of the respective inner cross sections of the pipe groups 31 respectively 32 matched to forming pipes. In addition to such an air side, uniformly structured heat exchanger grid as shown in the embodiment shown, according to the invention at the common plenum 22 the second, middle junction box 22 of the heat exchanger 1 Also pipes with different outer dimensions, differently distributed pipes or tubes spaced differently spaced be provided. It could possibly be designed to achieve a temperature stratification in the associated areas in addition to the operation of the embodiment shown by influencing the degree of heat exchange by designing the tube interior, medium-side heat transfer, a different interpretation of the air side heat transfer of the different areas of the heat exchanger grid.

Claims (6)

Heat exchanger with a heat exchanger grid and in the heat exchanger grid parallel to each other arranged pipes, and with three junction boxes, wherein a first pipe group a first terminal box with a second terminal box and a second pipe group connect the second terminal box with a third terminal box, characterized in that the second terminal box ( 22 ) a single collection space ( 220 ) to which both the first tube group ( 31 ), as well as the second tube group ( 32 ) are connected. Heat exchanger according to claim 1, characterized in that the connection cross-sections of the two tube groups ( 31 . 32 ) opposite each other in the second collecting space ( 220 ) are arranged. Heat exchanger according to claim 1 or 2, characterized in that mutually associated tubes of the two tube groups ( 31 . 32 ), which with their connection cross sections in the second collecting chamber ( 220 ) are arranged substantially opposite each other, have different inner line contours or are spaced differently from other tubes of the same group of tubes. Heat exchanger according to one of claims 1 to 3, characterized in that the two tube groups ( 31 . 32 ) each have tubes of different line cross-section. Heat exchanger according to one of claims 1 to 3, characterized in that the tubes of the two tube groups ( 31 . 32 ) in each case different are distributed. Heat exchanger according to one of claims 1 to 4, characterized in that at least a part of the tubes has a plurality of floods and the tubes of the two tube groups ( 31 . 32 ) each have a different number of floods.