Heat exchanger, air conditioning assembly and cabinet

Abstract

The invention relates to a heat exchanger (100), in particular a heat exchanger (100) of an air conditioning arrangement (200) configured for air conditioning a control cabinet (300), wherein the air conditioning arrangement (200) has a housing (16) comprising a control cabinet-side housing area (161) and an outer housing area (162), as well as a partition element (32) arranged between the control cabinet-side housing area (161) and the outer housing area (162), which fluidically separates the control cabinet-side housing area (161) and the outer housing area (162), with a piping system (10) designed for conveying a refrigerant, wherein the piping system (10) comprises a first manifold (111) and a second manifold (112) and several pipe elements (12) whose free ends extend into the manifolds (111, 112). discharge, with at least one of the collector pipes (111,112) has a refrigerant inlet (13) and at least one of the manifolds (111, 112) has a refrigerant outlet (14), which are fluidly connected to each other by the piping system (10), wherein the pipe elements (12) are connected to two spaced-apart mounting plates (151, 152) which gas-tightly enclose the pipe elements (12), so that the heat exchanger (100) can be mounted on the partition element (32) such that the manifolds (111, 112) are arranged in the outer housing area (162) when mounted and the pipe elements (12) are arranged at least partially in the control cabinet-side housing area (161). The invention further relates to an air conditioning arrangement (200) and a control cabinet (300).

Description

[0001] The invention relates to a heat exchanger, in particular a heat exchanger of an air conditioning arrangement designed for air conditioning a control cabinet, wherein the air conditioning arrangement has a housing which has a control cabinet-side housing area and an outer housing area as well as a partition element arranged between the control cabinet-side housing area and the outer housing area, which fluidically separates the control cabinet-side housing area and the outer housing area from each other, with a piping system designed for conveying a refrigerant.

[0002] The invention also relates to an air conditioning arrangement for a control cabinet, in particular an air conditioning arrangement for use with a control cabinet.

[0003] The invention further relates to a control cabinet with a housing that accommodates a large number of electronic components. Technological background

[0004] A control cabinet of the type discussed here houses a multitude of electronic components designed to control a process plant, machine tool, or other manufacturing equipment. Typical electronic components include, in particular, power cables, terminals, resistors, capacitors, diodes, transistors, inductors, integrated circuits, relays, sensors, and much more. During normal operation of such a control cabinet, heat is generated, which must be effectively dissipated to maintain the long-term functionality of the electrical components.For this purpose, a heat exchanger with a piping system and / or an air conditioning unit with such a heat exchanger is installed in a conventional control cabinet. The piping system is designed to convey a refrigerant and comprises several pipe sections and several pipe bends, with each pipe bend connecting two end sections of two pipe sections in a fluid-conducting manner. The piping system thus forms a coil in which a refrigerant circulates, absorbing heat within the control cabinet and dissipating it outside. For effective heat dissipation, an airflow is generated in an inner circuit or within the interior of the control cabinet, which acts on the heat exchanger. This inner circuit or the interior of the control cabinet is shielded from the outer circuit or the surrounding environment, preventing any gases from entering the interior of the control cabinet.

[0005] According to current technology, fluorinated greenhouse gases are the most commonly used refrigerants. While these are thermodynamically advantageous for heat dissipation, they are released into the environment in the event of a leak, which has negative impacts on the climate. Areas particularly prone to leakage in such piping systems are pipe bends with a curvature greater than 90° and connection points, especially soldered joints, between the pipe bends and the pipe sections. Therefore, conventional heat exchanger piping systems have leakage-prone areas at every pipe bend, namely the bend itself and the two connection points to the pipe sections located there. The use of fluorinated greenhouse gases as refrigerants is to be discontinued in the foreseeable future, which is why alternative refrigerants must be used in the future.

[0006] Alternative refrigerants that are thermodynamically viable are generally flammable or highly flammable, or exhibit high operating pressures during transcritical operation. To use such refrigerants safely and in compliance with regulations in control cabinet air conditioning, a safe design, particularly of the control cabinet's internal circuit, is necessary. In the event of a leak, it must be ensured that escaping refrigerant, especially in the evaporator area, does not create an explosive atmosphere, as this could be ignited by an electronic component within the control cabinet. Description of the invention: Problem, solution, advantages

[0007] Based on this, the object of the invention is to provide a heat exchanger, an air conditioning arrangement, and a control cabinet that allow the safe operation of the heat exchanger with a flammable or highly flammable refrigerant, or with a refrigerant that exhibits high operating pressures during transcritical operation. Furthermore, the number of leakage-prone areas is to be reduced.

[0008] This problem is initially solved by a heat exchanger, in particular a heat exchanger of an air conditioning arrangement designed for air conditioning a control cabinet, wherein the air conditioning arrangement has a housing comprising a control cabinet-side housing area and an external housing area, as well as a partition element arranged between the control cabinet-side housing area and the external housing area, which fluidically separates the control cabinet-side housing area and the external housing area from each other, with a piping system designed for conveying a refrigerant, wherein the piping system comprises a first manifold and a second manifold and several pipe elements whose free ends open into the manifolds, wherein at least one of the manifolds has a refrigerant inlet and at least one of the manifolds has a refrigerant outlet.which are fluidly connected to each other by the piping system, wherein the pipe elements are connected with two spaced-apart mounting plates that gas-tightly enclose the pipe elements, so that the heat exchanger can be mounted on the partition element in such a way that the manifolds are arranged in the outer housing area when mounted and the pipe elements are arranged at least partially in the control cabinet-side housing area.

[0009] The problem is also solved by an air conditioning arrangement for a control cabinet, in particular for use with a control cabinet, wherein the air conditioning arrangement has a housing which has a control cabinet-side housing area and an outer housing area as well as a partition element arranged between the control cabinet-side housing area and the outer housing area, which fluidically separates the control cabinet-side housing area and the outer housing area from each other, wherein the air conditioning arrangement further comprises such a heat exchanger.

[0010] The task is further solved by a control cabinet with a housing that accommodates a large number of electronic components, wherein the control cabinet includes such a heat exchanger and / or such an air conditioning arrangement.

[0011] Due to the inventive design of the heat exchanger, the air conditioning system, and the control cabinet, during intended use, only elements of the heat exchanger that can be assumed to be leak-free are arranged within the control cabinet-side housing area of ​​the air conditioning system. Leakage-prone areas, on the other hand, are located in the outer housing area of ​​the air conditioning system, thus preventing contamination of the inner circuit or the interior of the control cabinet by flammable or highly flammable gases. Therefore, the inventive heat exchanger, the inventive air conditioning system, and the inventive control cabinet allow for the safe use of such a refrigerant.Furthermore, the number of leakage-prone areas is significantly reduced because the heat exchanger is advantageously designed without pipe bends, and the number of leakage-prone areas is reduced by at least the number of pipe bends that would otherwise be required.

[0012] Advantageous embodiments of the present invention are specified below and in the dependent claims.

[0013] According to an advantageous embodiment of the invention, the pipe elements and the collector pipes are materially bonded to one another via connection points. In particular, it is provided that the pipe elements and the collector pipes are soldered to one another at the connection points.

[0014] The pipe elements are preferably designed as either a pipe section or a pipe string. A pipe section has a substantially cylindrical shell and a single channel running longitudinally through it. In contrast, a pipe string has a plurality of parallel channels or capillaries (microchannels). In a simple embodiment, such a pipe string consists of a flat profile through which a number of channels run longitudinally.

[0015] For effective heat dissipation, the heat exchanger preferably has a heat transfer element, in particular a finned arrangement with a plurality of fins or lamellae that are in thermally conductive contact with or connected to the pipe elements. During intended use, the pipe elements and the fins are surrounded by an airflow, whereby heat is transferred from the airflow to the heat exchanger. The fins are connected to the pipe elements, in particular by force-fit or material bonding, for the purpose of thermal conductivity. The fins are preferably corrugated and arranged between each pair of pipe elements. Such a corrugated profile has alternating crests and troughs, which form the contact surface on the pipe elements. A flow channel is formed between each pair of adjacent crests and between each pair of adjacent troughs, which is designed and configured to guide the airflow.This flow channel preferably runs transversely to the pipe elements. Furthermore, the ribs may preferably have slots and / or be profiled.

[0016] According to an advantageous further development, it is provided that one of the mounting plates is arranged between each of the ribs and the collector tubes. Thus, the ribs are flanked on both the left and right sides by a mounting plate.

[0017] The refrigerant flow through the piping system, from the refrigerant inlet to the refrigerant outlet, can be implemented in various ways. Preferably, the refrigerant inlet and outlet are located on the same manifold or on different manifolds.

[0018] In a first embodiment, the refrigerant inlet and outlet are arranged on separate manifolds. The refrigerant then flows exclusively from the first manifold to the second. Thus, the refrigerant passes through the pipe elements only once during its passage through the heat exchanger and is subsequently discharged. In this case, the refrigerant flow velocity is comparatively low because the effective cross-sectional area of ​​the pipe elements is relatively large.

[0019] Alternatively, the refrigerant flow along the piping system can be meandering. For this purpose, the manifolds each have a number of baffles that divide them into several sections. The baffles are arranged such that the refrigerant can flow through at least one of the manifolds multiple times from the refrigerant inlet to the refrigerant outlet. The refrigerant flow velocity increases with the number of baffles because the effective cross-sectional area of ​​the opening decreases.

[0020] In the case where the refrigerant inlet and outlet are both arranged on a first manifold and neither a refrigerant inlet nor outlet is provided on a second manifold, the number N of partitions in the first manifold and the number M of partitions in the second manifold are preferably: M = N - 1. In the case where the refrigerant inlet and outlet are arranged on different manifolds, the number N of partitions in the first manifold and the number M of partitions in the second manifold are preferably: M = N.

[0021] The pipe elements are preferably designed to be straight with respect to their respective longitudinal axis. This results in an essentially straight heat exchanger that can be easily installed within an air conditioning system. Alternatively, the pipe elements may have a curvature with respect to their respective longitudinal axis of 90° or less, and in particular 45° or less. This allows the heat exchanger to be adapted to specific geometries of the control cabinet due to space constraints.

[0022] The manifolds, pipe elements, fins, and / or mounting plates are preferably made of aluminum and are soldered together at the joints. Aluminum has high thermal conductivity and is therefore particularly suitable for a heat exchanger.

[0023] The refrigerant inlet and / or outlet can be formed by pipe fittings, particularly those connected to a manifold. Furthermore, the refrigerant inlet and / or outlet can preferably be made of copper.

[0024] The housing of the air conditioning unit preferably accommodates the heat exchanger such that the manifolds are located in the outer housing area and the pipe elements are arranged at least partially, preferably to more than 60%, and particularly preferably to more than 80% of their respective total length, in the control cabinet-side housing area. In particular, the sections in the control cabinet-side housing area are those connected to at least one of the fins. For this purpose, the partition element of the housing preferably has at least two openings or recesses through which the heat exchanger passes when assembled. In an embodiment with two openings, it is preferably provided that the first opening is larger than the second opening, which facilitates the installation of the heat exchanger.For this purpose, one of the mounting plates is larger than the other, allowing the heat exchanger to be inserted into the opening. This means that one of the mounting plates is wider and taller than the other, perpendicular to the insertion direction of the heat exchanger. The smaller of the two mounting plates can be inserted through the opening of the partition element, while the larger mounting plate rests against the periphery of the opening. In an embodiment with two recesses, it is preferably provided that the heat exchanger can be inserted laterally into the recesses. The recesses form a contour open on one side and are integrated into the partition element. When the heat exchanger is inserted into the recesses, the recesses can be closed fluid-tight using cover elements.

[0025] For mounting the heat exchanger, screw connections or rivet connections are provided, for which the mounting plates and the partition element have pre-drilled holes. Seals are preferably arranged between the mounting plates and the partition element to ensure a gas-tight installation of the heat exchanger. Separately, a fan is preferably provided, which is arranged and configured within the air conditioning unit to provide forced ventilation of the heat exchanger.

[0026] The refrigerant is preferably flammable and / or explosive. In particular, the refrigerant is or contains propane, butane, isobutane, or propene.

[0027] Regardless of the specific design of the heat exchanger, it can be configured as an evaporator in a compression refrigeration machine. A compression refrigeration machine is a refrigeration machine that utilizes the physical effect of the increase in enthalpy during a change of state from liquid to gaseous. The circulating refrigerant undergoes various changes of state in succession. This process exploits the fact that the condensation and boiling points of the refrigerant change depending on its pressure. The gaseous refrigerant is first compressed by a compressor, causing its boiling point and pressure to rise. In a downstream condenser, it condenses, releasing heat. Subsequently, the liquid refrigerant is expanded by means of an expansion valve, causing its boiling point to decrease. In the downstream evaporator, the refrigerant evaporates at a low temperature, absorbing heat and thus completing the cycle. Brief description of the characters

[0028] Specific embodiments of the invention are explained below with reference to the figures. These show: Fig. 1a a first cross-sectional view of a first heat exchanger; Fig. 1b a second cross-sectional view of the first heat exchanger along cross-sectional plane AA; Fig. 1c a third cross-sectional view of the first heat exchanger along cross-sectional plane BB; Fig. 1d two cross-sectional views of the first heat exchanger along cross-sectional plane CC; Fig. 2 a cross-sectional view of a second heat exchanger; Fig. 3 a cross-sectional view of a third heat exchanger; Fig. 4a a cross-sectional view of a fourth heat exchanger; Fig. 4b a cross-sectional view of a fifth heat exchanger; Fig. 5a, b cross-sectional views of a first air conditioning arrangement with a control cabinet; and Fig. 6a, b cross-sectional views of a second air conditioning arrangement with a control cabinet. Detailed description of the characters

[0029] Fig. 1a Figure 1 shows a first embodiment of a heat exchanger 100 of an air conditioning arrangement 200, which is configured for air conditioning a control cabinet 300. Fig. 5a , b and 6a , b Figures 1 and 2 show embodiments of an air conditioning arrangement 200, each with a (partially shown) control cabinet 300. The air conditioning arrangement 200 has a housing 16, which has a control cabinet-side housing area 161 and an outer housing area 162, as well as a partition element 32 arranged between the control cabinet-side housing area 161 and the outer housing area 162, which fluidically separates the control cabinet-side housing area 161 and the outer housing area 162 from each other.

[0030] The heat exchanger 100 has a piping system 10 designed for conveying a refrigerant. For this purpose, the piping system 10 comprises a first manifold 111 and a second manifold 112, and eight pipe elements 12, the free ends of which open into the manifolds 111 and 112. In the illustrated embodiment, the first manifold 111, shown on the left, has a refrigerant inlet 13, and the manifold 112, shown on the right, has a refrigerant outlet 14, which are fluidly connected to each other. The pipe elements 12 are connected to two spaced-apart mounting plates 151 and 152, which gas-tightly enclose the pipe elements 12. This allows the heat exchanger 100 to be mounted on the partition element 32 of the air conditioning arrangement 200 in such a way that the collector pipes 111, 112 are arranged in the outer housing area 162 and the pipe elements 12 are arranged at least partially in the control cabinet-side housing area 161.The pipe elements 12 and the collecting pipes 111, 112 are connected to each other by means of connection points 17. In the illustrated embodiment, the pipe elements 12 are each designed as a pipe string 121, wherein each pipe string 121 has a number of 8 channels 18 arranged parallel to each other (. Fig. 1b, c ).

[0031] For heat dissipation, the heat exchanger 100 has a heat transfer element in the form of a fin arrangement with a plurality of fins 19, which are thermally connected to the tube elements 12. During normal operation, the tube elements 12 and the fins 19 are surrounded by an airflow, whereby heat is transferred from the airflow to the heat exchanger 100. In the illustrated embodiment, the fins 19 are corrugated and arranged between each pair of tube elements 12. Such a corrugated profile has alternating crests 20 and troughs 21, which serve as contact surfaces on the tube elements. A flow channel 22 is formed between each pair of adjacent crests 20 and between each pair of adjacent troughs 21, which is designed and configured to guide the airflow. This flow channel 22 runs perpendicular to the tube elements 12.Mounting plates 151 and 152 are arranged on the left and right sides of the ribs 19, between the ribs 19 and the collector tubes 111 and 112. The mounting plate 151 shown on the left ( Fig. 1a , b ) is larger than the mounting plate 152 shown on the right ( Fig. 1a , c ), so that the heat exchanger 100 can be inserted into an opening 231. Fig. 1d Figure 1 shows top views of two alternative embodiments of a heat exchanger 100 along the cross-sectional plane CC. The manifolds 111, 112 can be round (alternative a) or rectangular (alternative b) in cross-section. Depending on its design, the refrigerant inlet 13 and the refrigerant outlet 14 of the heat exchanger 100 are arranged on the same manifold 111, 112 or on different manifolds 111, 112. Fig. 1aFigure 1 shows an embodiment in which the refrigerant inlet 13 and the refrigerant outlet 14 are formed on different manifolds 111, 112. The refrigerant is thus directed from the refrigerant inlet 13 via the first manifold 111, the pipe elements 12, and the second manifold 112 to the refrigerant outlet 14. The pipe elements 12 are therefore uniformly permeated by the refrigerant flow in one direction.

[0032] Fig. 2Figure 1 shows a second embodiment of a heat exchanger 100, in which the manifold 111 shown on the left has a partition 24 between the upper four tube elements 12 and the lower four tube elements 12, thus forming two capsules 25 in the manifold 111. Four tube elements 12 open into each of the capsules 25. The manifold 112 on the right has no partition. As a result, the refrigerant inlet 13 and the refrigerant outlet 14 are located on the manifold 111 shown on the left, and the refrigerant flows through the tube elements 12 at least once in both directions.

[0033] Fig. 3Figure 1 shows a third embodiment of a heat exchanger 100, the manifold 111 of which, shown on the left, has two partitions 24, so that the manifold 111 has three capsules 25. In contrast, the manifold 112 shown on the right has only one partition 24, so that the manifold 112 has two capsules 25 and the refrigerant inlet 13 and the refrigerant outlet 14 are arranged on the same manifold 111.

[0034] Fig. 4a Figure 1 shows a fourth embodiment of a heat exchanger 100, the manifold 111 of which, shown on the left, has four partitions 24, resulting in the manifold 111 having five capsules 25. In contrast, the manifold 111 shown on the right has only three partitions 24, so that the refrigerant inlet 13 and the refrigerant outlet 14 are arranged on the same manifold 111.

[0035] Fig. 4bFigure 1 shows a fifth embodiment of a heat exchanger 100 with 7 tube elements 12, the manifold 111 of which, shown on the left, has three partitions 24, thus giving the manifold 111 four capsules 25. The manifold 111 shown on the right also has three partitions 24, so that the refrigerant inlet 13 and the refrigerant outlet 14 are arranged on different manifolds 111.

[0036] As already explained, the Fig. 5a , b and 6a , bEach embodiment of the air conditioning arrangement 200 with the (partially shown) control cabinet 300. The air conditioning arrangement 200 has the housing 16, which has the control cabinet-side housing area 161 and the outer housing area 162 as well as the partition element 32 arranged between the control cabinet-side housing area 161 and the outer housing area 162, which fluidically separates the control cabinet-side housing area 161 and the outer housing area 162 from each other.

[0037] Fig. 5aFigure 1 shows a first combination of the air conditioning arrangement 200 and the control cabinet 300 in an assembled state. The control cabinet 200 has a control cabinet housing 33, which accommodates a heat source in the form of a multitude of electronic components 26. The air conditioning arrangement 200 includes a heat exchanger 100, which is designed to dissipate heat from the control cabinet housing 33. For this purpose, unnumbered openings are provided between the control cabinet 300 and the control cabinet-side housing area 161, through which a convection flow 34 passes, transporting heat. The heat exchanger 100 is forced-ventilated within the housing 16 of the air conditioning arrangement 200 by means of a fan 27, which intensifies the convection flow 34 and promotes the efficiency of the heat exchanger 100.The heat exchanger 100 is designed as an evaporator 101 of a compression refrigeration machine 28, which has a compressor 29, a condenser 30, and an expansion valve 31 within the outer housing area 162. The partition element 32 of the housing 16 has two openings 231, 232, which are dimensioned and positioned such that the heat exchanger 100, whose tube elements 12 are free of curvature with respect to their respective longitudinal axes in the illustrated embodiment, passes through both openings 231, 232 in the assembled state. The mounting plates 151 and 152 are of different sizes, with the comparatively smaller mounting plate 152 resting in the control cabinet-side area 161 of the housing 16 or the partition element 32 when mounted, and the comparatively larger mounting plate 151 resting in the outer housing area 162 of the housing 16 or the partition element 32.The housing 16 accommodates the heat exchanger 100 such that the manifolds 111, 112 are located in the outer housing section 162 and the pipe elements 12 are arranged section by section in the control cabinet-side housing section 161 of the housing 16, which is why all leakage-prone areas are located exclusively in the outer housing section 162 of the housing 16. This prevents refrigerant from entering the control cabinet 300 in the event of a leak.

[0038] Fig. 5b The figure shows schematically the assembly of the heat exchanger 100, which for this purpose can be inserted linearly in the direction of arrow P1 into the housing 16 of the air conditioning arrangement 200 until the mounting plates 151, 152 are in contact with the housing 16 or with the partition element 32 and are fastened there.

[0039] The Fig. 6aFigure 1 shows a second combination of the air conditioning arrangement 200 and the control cabinet 300 in an assembled state. The construction and operation of the air conditioning arrangement 200 and the control cabinet 300 are analogous to the embodiment according to [reference to relevant figure]. Fig. 5a In contrast, the partition element 32 of the air conditioning arrangement 200 shows Fig. 6aTwo openings 231, 232 are provided, which are oriented at an angle to each other due to space constraints. To allow the heat exchanger 100 to be mounted in these openings, its pipe elements 12 have a 90° curvature with respect to their respective longitudinal axes, so that the heat exchanger 100, when assembled, passes through both openings 231, 232. The mounting plates 151, 152 are of different sizes, with the comparatively smaller mounting plate 152 resting in the control cabinet-side area 161 of the housing 16 or the partition element 32 when assembled, and the comparatively larger mounting plate 151 resting in the outer housing area 162 of the housing 16 or the partition element 32.The housing 16 accommodates the heat exchanger 100 such that the manifolds 111, 112 are located in the outer housing section 162 and the pipe elements 12 are arranged section by section in the control cabinet-side housing section 161 of the housing 16, which is why all leakage-prone areas are located exclusively in the outer housing section 162 of the housing 16. This prevents refrigerant from entering the control cabinet 300 in the event of a leak.

[0040] Fig. 6b Figure 1 schematically shows the assembly of the heat exchanger 100, which can be inserted into the housing 16 of the air conditioning arrangement 200 along the arc-shaped direction of arrow P2 until the mounting plates 151, 152 are in contact with the housing 16 or with the partition element 32 and are fastened there. Reference symbol list

[0041] 100 Heat exchanger 200 Air conditioning unit 300 Control cabinet 10 Piping system 111 Manifold 112 Manifold 12 Pipe element 121 Pipe string 13 Refrigerant inlet 14 Refrigerant outlet 151 Mounting plate 152 Mounting plate 16 Housing 161 Control cabinet-side housing area 162 External housing area 17 Connection point 18 Duct 19 Rib 20 Wave crest 21 Wave trough 22 Flow channel 231 Opening 232 Opening 24 Partition 25 Capsule 26 Electronic component 27 Fan 28 Compression refrigeration machine 29 Compressor 30 Condenser 31 Throttle 32 Partition element 33 Control cabinet housing 34 Convection flow 101 evaporators P 1,2 Arrow direction

Claims

1. Heat exchanger (100), in particular heat exchanger (100) of an air conditioning arrangement (200) designed for air conditioning a control cabinet (300), wherein the air conditioning arrangement (200) has a housing (16) which has a control cabinet-side housing area (161) and an outer housing area (162) as well as a partition element (32) arranged between the control cabinet-side housing area (161) and the outer housing area (162), which fluidically separates the control cabinet-side housing area (161) and the outer housing area (162) from each other, with a piping system (10) designed for conveying a refrigerant, characterized by the fact thatThe piping system (10) comprises a first manifold (111) and a second manifold (112) and several pipe elements (12) whose free ends open into the manifolds (111, 112), wherein at least one of the manifolds (111, 112) has a refrigerant inlet (13) and at least one of the manifolds (111, 112) has a refrigerant outlet (14) which are fluidly connected to each other by the piping system (10), wherein the pipe elements (12) are connected to two spaced-apart mounting plates (151, 152) which gas-tightly enclose the pipe elements (12), so that the heat exchanger (100) can be mounted on the partition element (32) such that the manifolds (111, 112) are in the outer housing area (162) when mounted and the pipe elements (12) are at least partially in the are arranged in the control cabinet housing area (161).

2. Heat exchanger (100) according to claim 1, wherein the pipe elements (12) and the collector pipes (111, 112) are connected to each other by means of connection points (17) in a materially bonded manner.

3. Heat exchanger (100) according to one of the preceding claims, wherein the pipe elements (12) are each designed as a pipe section or as a pipe string (121), wherein a pipe string (121) has a plurality of channels (18) arranged parallel to each other.

4. Heat exchanger (100) according to one of the preceding claims with a heat transfer element, in particular a fin arrangement with a plurality of fins (19) which are thermally connected to the tube elements (12), wherein in particular the fins (19) are corrugated and arranged between each pair of tube elements (12), and / or wherein in particular one of the mounting plates (151, 152) is arranged between the fins (19) and the collector tubes (111, 112).

5. Heat exchanger (100) according to one of the preceding claims, wherein the refrigerant inlet (13) and the refrigerant outlet (14) are arranged on the same manifold (111, 112) or on different manifolds (111, 112).

6. Heat exchanger (100) according to one of the preceding claims, wherein the manifolds (111, 112) each have a number of partitions (24) which separate the manifolds (111, 112) into a number of capsules (25), wherein the partitions (24) are arranged such that the refrigerant can be conducted multiple times through at least one of the manifolds (111, 112) from the refrigerant inlet (13) to the refrigerant outlet (14), wherein in particular the refrigerant inlet (13) and the refrigerant outlet (14) are arranged on the same manifold (111, 112), wherein the number N of partitions (24) of the first manifold (111) and the number M of partitions (24) of the second manifold (112) is: M = N - 1, or wherein in particular the refrigerant inlet (13) and the refrigerant outlet (14) are arranged on are arranged in different collector pipes (111, 112),where the number N of partitions (24) of the first collector pipe (111) and the number M of partitions (24) of the second collector pipe (112) are: M = N., 7. Heat exchanger (100) according to one of the preceding claims, wherein the tube elements (12) have a curvature with respect to their respective longitudinal axis which is less than or equal to 90°, in particular less than or equal to 45°, or wherein the tube elements (12) are free of curvature with respect to their respective longitudinal axis.

8. Heat exchanger (100) according to one of the preceding claims, wherein the collector tubes (111, 112), the tube elements (12), the fins (19) and the mounting plates (151, 152) are made of aluminium and are soldered together at the connection points (17).

9. Heat exchanger (100) according to one of the preceding claims, wherein one of the mounting plates (151, 152) is larger than the other of the mounting plates (151, 152) so that the heat exchanger (100) can be inserted into a housing opening (231, 232), in particular into a housing opening (231, 232) of the air conditioning arrangement (200).

10. Heat exchanger (100) according to any of the preceding claims, wherein the refrigerant is flammable and / or explosive and / or the refrigerant is or contains propane, butane, isobutane or propene.

11. Heat exchanger (100) according to one of claims 1 to 15, wherein the heat exchanger (100) is designed as an evaporator (101) of a compression refrigeration machine (28).

12. Air conditioning arrangement (200) for a control cabinet (300), in particular for use with a control cabinet (300), characterized by the fact thatthe air conditioning arrangement (200) comprises a housing (16) which has a control cabinet-side housing area (161) and an outer housing area (162) as well as a partition element (32) arranged between the control cabinet-side housing area (161) and the outer housing area (162), which fluidically separates the control cabinet-side housing area (161) and the outer housing area (152) from each other, wherein the air conditioning arrangement (200) further comprises a heat exchanger (100) according to one of the preceding claims.

13. Air conditioning arrangement (200) according to claim 12, wherein the housing (16) accommodates the heat exchanger (100) such that the collector tubes (111, 112) are arranged in the outer housing area (162) and the tube elements (12) are arranged at least partially in the control cabinet-side housing area (161), and / or wherein the partition element (32) has at least two openings (231, 232) or recesses through which the heat exchanger (100) penetrates in the assembled state.

14. Air conditioning arrangement (200) according to claim 12 or 13, wherein a fan (27) is provided which is arranged and configured inside the housing (16) for forced ventilation of the heat exchanger (100).

15. Control cabinet (300) with a housing (33) that accommodates a variety of electronic components (26), characterized by the fact thatthe control cabinet (300) comprises a heat exchanger (100) according to one of claims 1 to 11 and / or an air conditioning arrangement (200) according to one of claims 12 to 14.

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