Heat exchanger module and photovoltaic module

Abstract

The invention relates to a heat exchanger module (1), - comprising at least two flat tubes (2) which extend at least approximately in parallel and each of which has a connection region (3) at a longitudinal end, - comprising a connection piece (4) which is tightly connected to an associated connection region (3) and has an inlet (5), which is arranged transversely to a longitudinal direction (7) of the flat tube (2), and / or an outlet (6), which is likewise arranged transversely to the longitudinal direction (7) of the flat tube (2), - wherein two adjacent connection pieces (4) are communicatively interconnected via their inlet (5) and outlet (6), - wherein an intermediate region (11) is arranged between two connection regions (3) in the longitudinal direction (7) of the flat tube (2), - wherein at least one connection region (3) is angled at least by a first angle α with respect to the intermediate region (11). As a result, a photovoltaic module (19) equipped therewith can achieve a particularly high degree of efficiency.

Description

[0001] Heat exchanger module and photovoltaic module

[0002] The present invention relates to a heat exchanger module. The invention also relates to a photovoltaic module comprising a solar cell module and a heat exchanger module arranged on a rear side of the solar cell module.

[0003] Photovoltaic modules with solar cells have been in use for many years and are primarily used to produce electricity, which is generated in the solar cells by converting solar light. In contrast, there are also so-called solar thermal modules, which convert solar energy into heat and, for example, support a heating system or the heating of domestic water. For this purpose, such solar thermal modules have a heat-absorbing surface crisscrossed with tubes through which a heat transfer medium, particularly a cooling fluid, flows. Also known are combined photovoltaic modules, which convert solar radiation energy into electrical energy using solar cells and into thermal energy using solar thermal modules. The advantage of such combined photovoltaic modules is their significantly higher efficiency than could be achieved with solar cell modules or solar thermal modules alone.Another major advantage of such combined photovoltaic modules is that the heating of the heat transfer medium flowing in the solar thermal module simultaneously cools the solar cell module, which reduces its internal electrical resistance and thus increases its performance.

[0004] Combined photovoltaic modules typically have a two-layer heat exchanger plate on the back of the solar cell module, within which cooling channels are arranged. The two plates of this two-part heat exchanger plate are punched, formed, and tightly glued or soldered together, making them relatively complex to manufacture. In addition to a complex manufacturing process, this also results in comparatively high material costs, as such heat exchanger plates are usually made of aluminum. Due to the wall thickness of the individual plates of the heat exchanger plate of approximately 0.8 mm required for proper function, the heat exchanger plates manufactured in this way also have a considerable weight. Accordingly, expensive tools are required for punching and forming the two plates.The soldering of the two plates to form the heat exchanger plate also takes place in energy-intensive soldering furnaces, which also increases the cost of production due to the comparatively high energy costs.

[0005] Another major disadvantage of conventional heat exchanger plates (heat exchanger modules) is that they are individually manufactured for each associated photovoltaic module and cannot be flexibly adapted to different sized solar cell modules. Instead, separate punching and forming tools must be maintained for heat exchanger modules of different sizes, resulting in high tool costs. If, for example, the dimensions of the desired heat exchanger module change, this can only be achieved with a comparatively large amount of tooling and the associated high tool costs, making a flexible design impossible with conventional heat exchanger plates.

[0006] The present invention therefore addresses the problem of providing a heat exchanger module that is particularly flexible in production. This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject matter of the dependent claims.

[0007] The present invention is based on the general idea of ​​segmenting a heat exchanger module, previously manufactured from two punched, formed, and soldered aluminum plates, for the first time into individual flat tubes that can be combined with one another as desired using respective connecting pieces. The heat exchanger module according to the invention therefore provides at least two flat tubes that run at least approximately parallel to one another and have a connecting region at each longitudinal end. A correspondingly configured connecting piece is tightly placed onto each of these connecting regions, with such a connecting piece having an inlet arranged transversely to a longitudinal direction of the flat tube and / or an outlet that is also arranged transversely to the longitudinal direction of the flat tube. The connecting pieces can thus have both an inlet and an outlet, or only an inlet or an outlet.Two adjacent flat tubes are connected to one another in a communicating manner via two adjacent connecting pieces, wherein an outlet of a connecting piece on a first flat tube is connected in a communicating manner, i.e. in a fluid-transmitting manner, to an inlet of a connecting piece arranged on an adjacent second flat tube. In the longitudinal direction of the flat tube, an intermediate region is arranged between two connecting regions, wherein at least one connecting region is angled to the intermediate region by at least a first angle a. An inlet and / or an outlet can in particular also be arranged parallel to a plane of the intermediate region of the flat tube arranged in a plate-like manner between the two connecting regions. By means of such a heat exchanger module according to the invention, a modular and thus extremely flexible design of the heat exchanger module can be achieved, so that it can be adapted comparatively easily to different dimensions.In particular, the flat tubes can be designed with different lengths to achieve different external dimensions for the heat exchanger module. It is also conceivable to use flat tubes of different lengths in a single heat exchanger module in order to easily accommodate design requirements, such as electrical connections for a solar cell module and / or connections for a heat exchanger medium. This eliminates the need to maintain different punching and forming tools for heat exchanger modules of different sizes, as was previously the case, significantly reducing manufacturing costs. A further major advantage of the heat exchanger module according to the invention lies in its comparatively lightweight construction. For example, the flat tubes can be designed with thin walls, thus ensuring good heat transfer and being lightweight.

[0008] In an advantageous development of the heat exchanger module according to the invention, at least one flat tube is designed as an extruded profile, in particular made of aluminum. Extruded profiles can be designed not only cost-effectively, but also with thin walls and thus both lightweight and resource-saving, whereby the flat tubes can be designed extremely efficiently in terms of heat exchanger performance and yet cost-effectively. Alternatively, it is also conceivable for at least one flat tube to be designed as an extruded profile made of plastic. This also creates a solution that is both lightweight and cost-effective, which, thanks to an extrusion process similar to extrusion, enables the production of extremely flexible lengths of flat tubes, even if the heat transfer capacity is reduced compared to a flat tube made of metal.In a particularly preferred embodiment, at least one connecting piece is made of aluminum or plastic. Constructing the connecting piece from plastic, in particular, offers the great advantage that such a connecting piece can be manufactured cost-effectively using a plastic injection molding process. For a tight connection to a flat tube constructed, for example, as an extruded aluminum profile, thermal direct joining can be used. This process involves locally heating the flat tube and joining it to the connecting piece in a similar way to a welding process. This enables, in particular, short cycle times and, in the event of maintenance or recycling, comparatively easy separation. Gluing such a plastic connecting piece to a flat tube made of plastic or metal is also conceivable.If the flat tube is also made of plastic, it can also be connected to a plastic connector via thermal joining in a fluid-tight manner. Alternatively, metal connectors, specifically aluminum, are also conceivable, allowing for simple soldering to the flat tubes, which are also made of aluminum, for example. The advantage of this material similarity between the flat tube and the connector lies in simplified recycling.

[0009] In a particularly preferred embodiment of the inventive solution, at least one connecting region is angled relative to the intermediate region by a second angle ß. The two angles α and ß can be opposite.

[0010] If they are the same size, the connecting area is shifted parallel to the intermediate area.

[0011] The angled or bent design of the connection areas relative to the intermediate area enables a problem-free, flat and thus good heat-transfer coupling of the flat tubes via their intermediate areas to a surface to be cooled, for example, a solar cell module of a photovoltaic module. At the same time, the angled or offset connection areas parallel to the intermediate area provide sufficient space for the arrangement of the connection pieces. In purely theoretical terms, it is also conceivable for the flat tubes to be neither angled nor offset parallel at their longitudinal end connection areas, so that in this case the connection pieces protrude laterally over a solar cell module of a photovoltaic module coupled to them, for example.

[0012] The intermediate areas can be plate-like and flat, thus enabling particularly effective cooling of a solar cell module coupled thereto.

[0013] Ideally, at least one flat tube is connected to an associated connector in a fluid-tight manner, in particular by soldering, pressing, welding, or bonding. Welding also includes what is known as thermal joining of different materials, such as a metallic flat tube with a plastic connector. Bonding enables low-energy joining, which can save costs. This non-exhaustive list alone gives an idea of ​​the diverse possibilities for a fluid-tight connection between a respective connection area of ​​a flat tube and an associated connector.

[0014] In a further advantageous embodiment of the heat exchanger module according to the invention, an outlet of the connecting piece is designed as a nozzle and an inlet of the same connecting piece is designed as a complementary coupling, so that adjacent connecting pieces can be plugged into one another in a fluid-tight manner. This allows a comparatively simple coupling of two adjacent connecting pieces to be achieved, wherein the outlet of a first connecting piece can be glued, welded, soldered, or pressed to an inlet of the second connecting piece for the fluid-tight connection. Alternatively, it is also theoretically conceivable for the inlet and the outlet to be designed as identical pipe nozzles or identical couplings, wherein a connecting pipe is provided which can be pushed or pushed into or onto the pipe nozzles or pushed into the coupling of adjacent connecting pieces.Using such a connecting pipe, the parallel spacing between two adjacent flat tubes can be easily and individually adjusted. Such a connecting pipe can, of course, also have different nozzles and couplings at its two longitudinal ends, which are designed to complement the couplings or nozzles at an inlet or outlet.

[0015] In a further particularly preferred embodiment of the heat exchanger module according to the invention, a fixing device is arranged on at least one connecting piece, via which fixing device two connecting pieces of two adjacent flat tubes can be fixed to one another. Such a fixing device can be designed, for example, as a clip connection or as a plug-in connection. With such a fixing device, two adjacent connecting pieces are not fixed via the inlet or outlet or a connecting pipe arranged therebetween, but rather there is a direct connection / fixing of the two connecting pieces to one another. Purely theoretically, it is also conceivable for the fixing device to have a connecting web that is firmly connected to both connecting pieces, in particular soldered, welded, or glued to them.This allows the fluid-transfer connection between the outlet and inlet of two adjacent connectors to be kept stress-free, or at least with minimal stress, which has a positive effect on the service life of the heat exchanger module according to the invention. Designing the fixing device as a clip connection offers the great advantage that the heat exchanger module can be easily disassembled into individual parts once the clip connections are removed. Such clip connections can, of course, also serve as pre-fixing or as a fixation during a soldering process.

[0016] The present invention is further based on the general idea of ​​equipping a photovoltaic module with a solar cell module and a heat exchanger module arranged on the rear side of this solar cell module, in accordance with the previous paragraphs, wherein the flat tubes of the heat exchanger module are connected to the rear side of the solar cell module in a heat-transferring manner. This makes it possible to cool the solar cell module and thereby reduce its internal electrical resistance, whereby the overall efficiency of the solar cell module can be increased. Furthermore, the heat dissipated at the rear via the heat exchanger module according to the invention can be used to heat a heat exchanger medium flowing in the heat exchanger module, for example a cooling fluid. This heated heat exchanger medium can be used to support a heating system or to heat domestic water.This makes it possible to produce a photovoltaic module with a significantly increased efficiency.

[0017] Thermal insulation is expediently provided on a rear side of the heat exchanger module facing away from the solar cell module. Such thermal insulation prevents or at least minimizes unintentional heat transfer from the heat exchanger module to the environment, whereby the heat exchanger medium heated in the heat exchanger module can transfer its thermal energy at least virtually undiminished to, for example, a heat exchanger for water heating or for heating support. Such a photovoltaic module according to the invention with a solar cell module and a heat exchanger module according to the invention can be used in stationary applications, for example in houses in which such a photovoltaic module according to the invention is connected to a heating circuit that serves to heat the house and / or to heat domestic water.The photovoltaic module according to the invention thus serves not only to generate thermal energy through solar radiation, but also to generate electrical energy through the solar cells of the solar cell module, whereby a significant increase in the overall efficiency can be achieved compared to a pure solar cell module or a pure solar thermal module.

[0018] Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures based on the drawings.

[0019] It is understood that the features mentioned above and those to be explained below can be used not only in the respective combination specified, but also in other combinations or on their own, without departing from the scope of the present invention. Components mentioned above and those to be mentioned below of a higher-level unit, such as a device, a device, or an arrangement, which are designated separately, may form separate parts or components of this unit or be integral areas or sections of this unit, even if this is shown differently in the drawings.

[0020] Preferred embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical components.

[0021] They show, schematically

[0022] Figure 1 is an oblique view of a heat exchanger module according to the invention,

[0023] Figure 2 is a view obliquely from below of a flat tube of a heat exchanger module according to the invention,

[0024] Figure 3a shows a detailed view of a double-angled connection area of ​​a flat tube of a heat exchanger module,

[0025] Figure 3b shows a detailed view of a simply angled connection area of ​​a flat tube of a heat exchanger module,

[0026] Figure 4 shows a detailed view of a connecting piece,

[0027] Figure 5 is a representation as in Figure 4, but with a transparent representation,

[0028] Figure 6 is a detailed view of the heat exchanger module according to the invention from Figure 1,

[0029] Figure 7 shows a further detailed view of the heat exchanger module according to the invention from Figure 1, Figure 8 shows a possible flow guidance of a heat exchanger medium in the heat exchanger module according to the invention,

[0030] Figure 9 is a representation as in Figure 8, but with a different flow pattern,

[0031] Figure 10 shows a photovoltaic module according to the invention with a heat exchanger module according to the invention.

[0032] According to Figures 1 and 6 to 10, a heat exchanger module 1 according to the invention has at least two flat tubes 2 running at least approximately parallel to one another (see also Figures 2, 3a and 3b), which have a connection region 3 at a respective longitudinal end. An associated connection piece 4 (see also Figures 4 and 5) is placed fluid-tight on each of these connection regions 3, wherein such a connection piece 4 has an inlet 5 and / or an outlet 6 and wherein the inlet 5 as well as the outlet 6 run transversely to a longitudinal direction 7 and in particular parallel to a plane E2 of an intermediate region 11 of the flat tube 2 located in plate-like manner between the two connection regions 3. In general, each connection piece 4 can have an inlet 5 or an outlet 6 or both an inlet 5 and an outlet 6.In the case of the connecting pieces 4 shown in Figures 4 and 5, these have either an inlet 5 or an outlet 6. At least one connecting region 3 to the intermediate region 11 is angled at least by a first angle a (cf. in particular Figures 3a and 3b). Two adjacent connecting pieces 4 are connected to one another in a communicating, i.e. fluid-transmitting, manner via their inlet 5 and outlet 6, so that a heat exchanger medium 8 can flow through the heat exchanger module 1 as shown in Figures 8 and 9. The great advantage of the heat exchanger module 1 according to the invention lies in particular in its modular design comprising individual flat tubes 2 with associated connecting pieces 4, whereby a wide variety of shapes, geometries and dimensions can be realized comparatively easily and without high tool setup costs.

[0033] The flat tubes 2 can be designed as extruded profiles, in particular as extruded aluminum profiles, and are thus not only cost-effective, but also lightweight and resource-efficient due to their comparatively thin wall thicknesses. The flat tubes 2 have either one or a plurality of internal channels 9, as shown in Figures 3a and 3b. As an alternative to a design of the flat tube 2 made of metal, in particular aluminum, a design of the flat tube 2 as an extruded profile made of plastic is also theoretically conceivable. A flat tube 2 made of plastic also enables a resource-efficient and comparatively lightweight construction.

[0034] At least one of the connecting pieces 4 can also be made of metal, in particular of aluminum, although a construction made of plastic, in particular as a plastic injection-molded part, is preferred. If such a connecting piece 4 is made of plastic, it can be produced in a cost-effective plastic injection molding process. The connecting piece 4 has a receptacle 10, by means of which it is pushed over the connection area 3 of an associated flat tube 2 and tightly connected. An outer contour of the connection area 3 of the flat tube 2 is complementary to an inner contour of the receptacle 10, whereby a play-free fit of the connection area 3 of the flat tube 2 in the receptacle 10 of the connecting piece 4 can be achieved. A connection between the connecting piece 4 and the associated connection area 3 of the flat tube 2 can be achieved, for example, by soldering, welding, pressing, or gluing.In particular, if the connecting piece 4 is also made of a metallic material, for example, aluminum like the flat tube 2, soldering is recommended. However, if the connecting piece 4 is made of plastic, gluing or direct thermal joining, i.e., welding, offers a tight connection option.

[0035] If the flat tube 2 is examined more closely, it can be seen that, in the longitudinal direction 7 of the flat tube, between the two connection regions 3 arranged at the longitudinal ends, there is an intermediate region 11 via which heat-transferring contact with a solar cell module 12 of a photovoltaic module 19 (see Figure 10) is made possible. As can be seen from Figures 1 to 3a and 6 to 10, at least one connection region 3 is angled relative to the intermediate region 11 by a second angle ß. The connection region 3 is therefore angled twice, here by angles α and β. If the two angles α and β are the same size, the connection region 3 runs parallel to the intermediate region 11. As a result, at least one connection region 3 of a flat tube 2, usually both connection regions 3 of the flat tube 2, lies in a first plane Ei, which is arranged parallel to the second plane E2, in which the intermediate region 11 of the flat tube 2 lies.The intermediate region 11 can be plate-like and flat. Of course, a simply angled orientation of the connection region 3 by the first angle α relative to the intermediate region 11 of the flat tube 2 is also conceivable, as shown in Figure 3b. What both embodiments have in common is that the single (only first angle α) or double (angles α and β) angled, in particular parallel offset, connection region 3 enables a simple arrangement of the connection pieces 4 compared to the intermediate region 11, since the angled or offset arrangement or orientation of the connection regions 3 creates sufficient free space for the connection pieces 4 with respect to the solar cell module 12. In general, a size of the first angle α can differ from a size of the second angle β.Alternatively, they can also be of the same size, creating the connection area 3 offset parallel to the intermediate area 11.

[0036] In order to be able to connect the individual flat tubes 2 to one another in a fluid-tight manner via their connecting pieces 4, an outlet 6 of the connecting piece 4 can be designed as a nozzle 13 and an inlet 5 of the connecting piece 4 can be designed as a coupling 14, so that adjacent connecting pieces 4 can be connected to one another in a fluid-tight manner by inserting the nozzle 13 of the outlet 6 of one connecting piece 4 into the coupling 14 of the inlet 5 of an adjacent connecting piece 4.

[0037] In order to increase the parallel spacing between two adjacent flat tubes 2, a connecting pipe 15 (see Figures 1 and 7 to 10) can also be provided between an outlet 6 of a first connecting piece 4 and an inlet 5 of an adjacent connecting piece 4. This connecting pipe 15 has, at a first longitudinal end, a coupling 14 complementary to the nozzle 13 of the outlet 6 of one connecting piece 4, and, at the opposite longitudinal end, a nozzle 13 complementary to the coupling 14 of the inlet 5 of the adjacent connecting piece 4. By means of such a connecting pipe, structural features, for example electrical connections of the solar cell module 12 and / or connections for the heat exchanger medium 8, can be integrated comparatively easily. Such connecting pipes 15 can also be used to achieve locally different cooling of the solar cell module 12 of the photovoltaic module 19.

[0038] In order to be able to reliably hold the individual flat tubes 2 together via the connecting pieces 4, a fixing device 16 is preferably arranged on each connecting piece 4, via which fixing device 16 two connecting pieces 4 of two adjacent flat tubes 2 and thus also the two flat tubes 2 can be fixed to one another. Such a fixing device 16 can be designed, for example, as a clip connection or a plug-in connection. A materially bonded connection of the fixing device 16 to the two adjacent connecting pieces 4 as well as adhesive bonding is also conceivable. By means of such a fixing device 16, in particular, the load acting on the inlet 5 and outlet 6 of adjacent connecting pieces 4 can be reduced and the service life of the heat exchanger module 1 according to the invention can be increased.

[0039] A flow through the heat exchanger module 1 according to the invention by means of heat exchanger medium 8, in particular a cooling fluid, can take place, for example, in an I-flow, as shown in Fig. 8, but also in a U-flow, as shown in Fig. 9.

[0040] In the heat exchanger module 1 according to Fig. 8, the heat exchanger medium flows from a central inlet, for example, at a connecting pipe 15, via the adjacent connecting pieces 4 through the connected flat tubes 2, and then via the connecting pieces 4 arranged on the outlet side of the flat tubes 2 to a central outlet, which in turn can also be arranged in the region of a connecting pipe 15. For the central inlet or the central outlet, the connecting pipe 15 can also be designed as a T-pipe.

[0041] In Fig. 9, the heat exchanger medium 8 flows from the inlet 5 via the connecting pieces 4 of a first half of the heat exchanger module 1, then through the associated flat tubes 2 and via the connecting pieces 4 arranged on the outlet side of the flat tubes 2 and the connecting pipe 15 through the second half of the heat exchanger module 1 back to the outlet 6.

[0042] By arranging flat tubes 2 with connecting pieces 4, which have only one inlet 5 or one outlet 6, a further individual fluid guidance through the heat exchanger module 1 can be achieved.

[0043] According to Figure 10, a photovoltaic module 19 is shown, which comprises the previously described solar cell module 12 with a plurality of solar cells, as well as the heat exchanger module 1 according to the invention, as described in the previous paragraphs. The flat tubes 2 of the heat exchanger module 1 are connected to a rear side of the solar cell module 12 in a heat-transferring manner, with the intermediate regions 11 of the flat tubes 2, in particular, being in contact with the solar cell module 12 in a heat-transferring manner.

[0044] Furthermore, a thermal insulation 18 can be arranged on a rear side of the heat exchanger module 1, which prevents, or at least reduces, unwanted heat radiation into the environment and thereby prevents unwanted cooling of the heat exchanger medium 8 before the transition to the heater 17 or a heat exchanger arranged there.

[0045] Such a photovoltaic module 19 offers the great advantage that by means of the

[0046] The heat exchanger module 1 not only provides additional thermal utilization of the solar radiation radiating onto the photovoltaic module 19, but also cools the solar cell module 12, thereby reducing its internal electrical resistance, which increases with increasing temperature, thereby increasing the overall efficiency of the solar cell module 12. The thermal energy obtained by means of the heat exchanger module 1 according to the invention can, for example, be fed into a heating system 17 of a house (see Figure 10) and there support a conventional heating system or be used to heat domestic water. A heating system 17 equipped with such a photovoltaic module 19 can thus be operated significantly more efficiently and in a more energy-efficient manner.

[0047] The heat exchanger module 1 according to the invention can be constructed much more cost-effectively and also much more flexibly, wherein the elimination of previous two-layer heat exchanger plates also eliminates the need for expensive tools such as punching and forming tools. In particular, the use of different connecting pieces 4 with, for example, an inlet 5 or an outlet 6 or both an inlet 5 and an outlet 6 makes it comparatively easy to influence the flow of a heat exchanger medium 8 in the heat exchanger module 1. By varying the length of the flat tubes 2 and the number of flat tubes 2, heat exchanger modules 1 of different sizes or photovoltaic modules 19 of different sizes can be realized with little tooling, i.e. extremely cost-effectively.In addition, the heat exchanger module 1 according to the invention and also the photovoltaic module 19 according to the invention can be manufactured in a significantly more resource-efficient and weight-optimized manner.

Claims

Claims 1. Heat exchanger module (1) for a photovoltaic module (19), - with at least two flat tubes (2) running at least approximately parallel, each having a connection area (3) at a respective longitudinal end, - with a connecting piece (4) tightly connected to an associated connecting area (3) with an inlet (5) arranged transversely to a longitudinal direction (7) of the flat tube (2) and / or an outlet (6) arranged transversely to the longitudinal direction (7) of the flat tube (2), - wherein two adjacent connecting pieces (4) are connected to each other via their inlet (5) and outlet (6), - wherein an intermediate region (11) is arranged in the longitudinal direction (7) of the flat tube (2) between two connection regions (3), - wherein at least one connection region (3) is angled relative to the intermediate region (11) at least by a first angle a.

2. Heat exchanger module (1) according to claim 1, characterized in that - that at least one flat tube (2) is designed as an extruded profile, in particular made of aluminum. - that at least one flat tube (2) is designed as an extruded profile made of plastic.

3. Heat exchanger module (1) according to claim 1 or 2, characterized in that at least one connecting piece (4) is made of aluminum or plastic.

4. Heat exchanger module (1) according to one of the preceding claims, characterized in that at least one connection region (3) is angled to the intermediate region (11) by a second angle ß.

5. Heat exchanger module (1) according to claim 4, characterized in that at least one connection region (3) of a flat tube (2) lies in a first plane Ei, which is arranged parallel to a plane E2, in which the intermediate region (11) of the flat tube (2) lies.

6. Heat exchanger module (1) according to one of the preceding claims, characterized in that at least one flat tube (2) is connected in a fluid-tight manner to an associated connecting piece (4).

7. Heat exchanger module (1) according to one of the preceding claims, characterized in that - that an outlet (6) of the connecting piece (4) is designed as a nozzle (13) and an inlet (5) of the connecting piece (4) is designed as a coupling (14) complementary thereto, so that adjacent connecting pieces (4) can be inserted into one another in a fluid-tight manner, or - that a connecting pipe (15) is provided between the outlet (6) and the inlet (5) of two adjacent connecting pieces (4).

8. Heat exchanger module (1) according to one of the preceding claims, characterized in that that a fixing device (16) is arranged on at least one connecting piece (4), via which two connecting pieces (4) of two adjacent flat tubes (2) can be fixed to one another.

9. Heat exchanger module (1) according to claim 8, characterized in that at least one fixing device (16) is designed as a plug connection.

10. Heat exchanger module (1) according to claim 8 or 9, characterized in that at least one fixing device (16) is designed as a clip connection.

11. Photovoltaic module (13) with a solar cell module (12) and a heat exchanger module (1) arranged on a rear side of the solar cell module (12) according to one of the preceding claims, wherein the flat tubes (2) of the heat exchanger module (1) are connected to the solar cell module (12) in a heat-transferring manner.

12. Photovoltaic module (13) according to claim 11, characterized in that a thermal insulation (18) is arranged on a rear side of the heat exchanger module (1) facing away from the solar cell module (12). *****

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