EP2394128A1

EP2394128A1 - Heat exchanger

Info

Publication number: EP2394128A1
Application number: EP10704306A
Authority: EP
Inventors: Christoph Rusch
Original assignee: JOULIA AG
Current assignee: JOULIA AG
Priority date: 2009-02-06
Filing date: 2010-02-04
Publication date: 2011-12-14
Also published as: US20110289674A1; US8973178B2; WO2010088784A1; CH700393A1

Abstract

A heat exchanger (1) for a shower tray (10) can be arranged in the bottom of the shower tray (10) for the heat recovery from wastewater so as to heat fresh water. To this end, the heat exchanger (1) has a planar cover plate (11) as the drain surface (17) over which the wastewater drains. The cover plate (11) forms the bottom of the shower tray (10), over which a lid (4) that can be removed without the use of tools is arranged as a tread plate. The heat exchanger (1) preferably comprises a distributor element (2), which is arranged for distributing the wastewater over the drain surface (17). The distributor element (2) is preferably a retaining element, which retains the wastewater at an upper edge of the drain surface and forms an overflow along the upper edge.

Description

Heat Exchanger

The invention relates to the field of heat exchangers and in particular to a heat exchanger for a shower device and a shower tray according to the preamble of the corresponding independent claims.

STATE OF THE ART

GB2416829A shows a heat exchanger for a shower tray, in which the wastewater flows through a box through which a meandering Zuflussfohr leads with fresh water. In the embodiment of FIGS. 3-6, waste water flows through a heat exchanger box, the surface of which is provided with ribs (21, 33) which act as baffles and cause a meandering course of the waste water via the heat exchanger.

In the heat exchanger of NL 1015561 C2, a pipe for the fresh water is passed through a channel with the waste water, wherein the sewer is formed in a plastic shell.

NL 1009927 C2 shows a heat exchanger in which the wastewater via a conical plate with attached above or below tubes with

Fresh water runs out. In another embodiment, the fresh water is passed between two conical and spaced plates, over which the wastewater runs off. This Ausfiihxungsform can not withstand a high pressure of fresh water, as required by regulatory approvals.

DE3319638A1 shows a heat exchanger, which is inserted into a shower tray of the tub bottom. A spiral fresh water pipe is inserted in a channel through which the wastewater flows. In one embodiment, meandering flows are defined by arcuate plates and separated from one another.

Both WO 2009/101161 A2 and WO 2008/155561 A1 also describe a heat exchanger arranged below a shower tray. In it pipes for supplying fresh water are arranged below the floor of a shower tray and flows around the wastewater on all sides.

The heat exchangers of the prior art have in common that the way in which the wastewater is led, leads to contamination of the wastewater system, which is difficult to clean.

PRESENTATION OF THE INVENTION

It is therefore an object of the invention to provide a heat exchanger for a shower tray and a shower tray of the type mentioned, which remedy the disadvantages mentioned above. Another object is to provide a heat exchanger with improved heat transfer.

This object is achieved by a heat exchanger for a shower tray and a shower tray according to the features of the corresponding independent claims. The heat exchanger for a shower tray is thus in the bottom of the shower tray for heat recovery from wastewater to warm up fresh water can be arranged. In this case, the heat exchanger has a flat cover plate with a drainage surface, via which the wastewater drains. This drainage surface thus forms a heat transfer surface or heat exchanger surface, and at the same time the floor or a part of the bottom of the shower tray. Preferably, the wastewater, after it has drained over this drainage surface, no longer passed over other heat exchanger surfaces in closed or hard to reach cavities, but in a drainage to sewers. So there are no wastewater flowed through cavities on the heat exchanger, which can pollute and silt. The heat exchanger surface, which is in contact with the waste water, and all areas (prior to the conventional process) in which sewage flows, are thus completely accessible and easy to clean. In other words, the heat exchanger is covered only at its top with wastewater, and the entire top and drainage surface is accessible, so it can be cleaned by hand without special tools.

Above the drainage surface a lid is arranged, which serves as a tread or footboard for a user. The lid is preferably removable by hand, so werkzeufrei, so that a very simple cleaning of the drainage surface respectively of the tub bottom is possible. The lid (one-piece or multi-part), for example, by hand, without actuation of other elements, simply lifted from the tub or tilted up. All areas of the shower tray, which are flowed through by wastewater, are thus accessible without tools and can be cleaned by hand without special aids.

In a preferred embodiment of the invention, the lid consists of several, in particular two, individual parts. This makes it possible for a user to stand on one part of the lid, to remove the other part and to clean it underneath. The serving as Ablaufϊläche surface of the heat exchanger is globally even, that is, it is a total, seen over the entire surface, flat, but still locally profiled, for example, with grooves.

Due to the flat construction and the flat cover plate, the entire upper surface of the heat exchanger can be overflowed by draining wastewater and thus absorb its heat. Due to the large and flat surface, a thin layer of the running water can form, wherein the heat transfer also improves: with thick layers, a layering of the temperature forms, whereby the water removed from the heat exchanger surface is isolated by the closer water. In principle, the heat exchanger can also be used in other systems than a shower tray, where hot water is needed and used hot water flows through the heat exchanger pressure. In combination with a shower tray but results in a particularly convenient and space-saving design.

Preferably, the drainage surface in the mounted in the shower tray heat exchanger in the direction of the slope of the drainage surface (drainage direction) is not structured, so that even a slight slope sufficient to drain the waste water along with mitge carried dirt. However, the drainage surface may have grooves or ribs which extend in the drainage direction.

If the shower tray is made of metal, such as chrome steel - with or without coating - so preferably the cover plate is integral with the shower tray, so formed from the same metal plate, typically by deep drawing. The remaining elements of the heat exchanger for guiding the fresh water are attached to this metal plate of the shower tray and thermally coupled, for example by soldering or welding. If the shower tray made of another material, such as ceramic or a plastic (possibly with fillers such as quartz sand), the heat exchanger is preferably used in a frame made of this other material and cemented or glued all around, so that no wastewater passes under the heat exchanger.

Preferably, the heat exchanger has a distribution element, which is arranged to distribute the waste water over the drainage surface. The distribution element is preferably a baffle element which retains the wastewater at an upper edge of the drainage surface and forms an overflow along the upper edge. The damming element is thus, for example, a channel or storage channel along the upper edge.

Thanks to the distribution element, the wastewater runs over the entire width of a preferably substantially rectangular drainage surface at the top of the

Heat exchanger off. So a very large surface is available for the heat exchange. Since this surface is preferably not structured in the outflow direction (although grooves or ribs may be present in the direction of flow), there are no obstacles to which water or dirt can accumulate. Also, the surface is very easy to clean.

The overflow is preferably formed by a plurality of distribution openings in the distribution element or by depressions (distribution channels) along the upper edge of the drainage surface. In addition, the distributing element preferably has one or more comparatively small drainage openings, which are arranged below the overflow and, after the end of the waste water flow, cause the sewage behind the damming element to run off. Instead of one or more drainage openings, there may also be one or more drainage channels which are deeper than the overflow, ie in particular deeper than the distribution channels, run, and thus have the same effect as the drain holes described.

The distribution element may be a bent-up portion of a sheet, from which a cover plate or a bottom or a core of the heat exchanger is formed. Alternatively, the distributing element may be integrally formed on a lid which serves as a stepping plate, ie as a downwardly projecting part of the lid, which retains and distributes the wastewater in front of the drainage surface.

Alternatively, the distribution element can also be integrally formed on the cover by a storage channel on the cover itself is formed as a storage element. This storage channel collects and distributes the wastewater already in the lid. Wastewater draining from the reservoir channel runs over the length of the upper edge of the drainage surface of the heat exchanger onto the drainage surface. Again, the storage channel preferably has distribution channels or distribution openings, which form individual defined drainage points for the overflow to the drainage surface. In another alternative variant of the invention, the distribution element is integrally formed on a trough bottom, which is not part of the heat exchanger.

In a preferred embodiment of the invention, in addition to the distribution openings, the distribution element has one or more safety overflow openings over which waste water can drain if the distribution openings can not absorb the stream of wastewater - either because the amount of waste water is too high, or because the distribution opening is clogged. In the simplest case, the height of the distribution element may be such that there is still an overflow gap between distribution element and the underside of the lid. In this case, the overflow gap forms the safety overflow opening.

In a further preferred embodiment of the invention, the lid on supporting elements or support ribs, by means of which the lid on the Heat exchanger is supported. The support ribs are, for example, integrally formed on the cover and preferably arranged parallel to the flow of the waste water (drainage direction). This allows the lid to be removed as a part by hand, and lid and heat exchanger can be easily cleaned by spraying.

In another embodiment of the invention, the support ribs form baffles or baffles for the sewage flow and fluidize them.

Preferably, the shower tray has an elongated and arranged in an edge region of the shower tray, removable filter insert, wherein a longitudinal direction of the filter insert is parallel to an edge of the shower tray, and the filter insert preferably in the longitudinal direction has at least three times greater extent than perpendicular thereto. The filter cartridge preferably has a laterally arranged handle for easy removal. Due to the elongated shape of the filter insert can be arranged in a space-saving manner along the edge of the shower tray, and protrudes very little into a footprint of the lid. The filter can also be arranged in the lid.

Preferably, there is an overflow channel which circulates around an edge of the tub bottom part, and waste water, which runs over the edge of the cover and leads to the storage element or distribution element and in particular to the filter insert. For this purpose, the edge of the lid lies in the area of the overflow channel. If the filter insert is clogged, the waste water can flow from the overflow channel, under the lid, directly into the area of the heat exchanger. Alternatively or additionally, the waste water can be guided through the lid itself, by being slightly inclined or having recesses with a sloping bottom, to the distribution element. In this case, the waste water can be guided only to one side of the shower tray, or, for example, if there is a heat exchanger with two mutually inclined sections, to two opposite sides of the shower tray. In further preferred embodiments of the invention, two or more heat exchangers of the type described are present in the bottom of the same shower tray. Thus, the entire height can be reduced at the same height and the same slope of the drainage surfaces. Preferably, the two or more heat exchangers are connected in parallel with respect to the fresh water supply. In this case, there is preferably a separate distribution element according to one of the variants described for each of the plurality of heat exchangers.

Further preferred embodiments will become apparent from the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the subject invention will be explained in more detail with reference to preferred embodiments, which are illustrated in the accompanying drawings. Each show schematically:

Figure 1 is a perspective view of a shower tray with a heat exchanger according to the invention;

Figure 2 is the same view with the lid removed; Figure 3 shows a cross section through the shower tray; Figure 4 is a longitudinal section through the shower tray; FIG. 5 is an exploded view of a preferred embodiment of the invention

heat exchanger; FIG. 6 is an exploded view of a preferred embodiment of the invention

Heat exchanger, together with the shower tray; FIG. 7 shows a detail of a distribution element; Figure 8 is a cross-section through part of another preferred

Embodiment of a heat exchanger; Figure 9 is a cross-section through part of another preferred

Embodiment of a heat exchanger; Figure 10 shows another arrangement of supports of the lid;

Figure 11 is a bottom view of a preferred embodiment of a

heat exchanger; Figure 12 is a view of a shower tray in a further preferred

Embodiment, with the lid inserted, wherein the lid has a molded distribution element;

Figure 13 the same shower tray with raised lid;

Figure 14a-f is a plan view and various cross sections through the same

Shower tray;

Figure 15 is a cross-section through a heat exchanger with a solid frame;

Figure 16 shows a cross section through a shower tray with two heat exchangers and two lids; and FIG. 17 shows a cross section through a drainage surface in a preferred embodiment

Embodiment of the invention.

The reference numerals used in the drawings and their meaning are listed in the list of reference numerals. Basically, the same parts are provided with the same reference numerals in the figures.

WAYS FOR CARRYING OUT THE INVENTION

A preferred embodiment of the invention will be explained with reference to Figures 1 to 4: The shower tray 10 has an inserted and preferably firmly connected to the shower tray 10 heat exchanger 1. In the figure 2 is a Meandering course of a fresh water channel, which runs below a cover plate 11 of the heat exchanger 1, drawn by dashed lines. Above the heat exchanger 1, a lid 4 is inserted. A lid edge 42 may be slightly bent down and is located in a circumferential overflow channel 31 on the edge of Duschwaπne 10. The overflow channel 31 via the lid edge 42 draining wastewater to a filter insert 32 on one side of the shower tray 10. The lid 4 is by means of at least approximately vertical, downwardly directed support ribs 41 supported. Thus, a space between the lid 4 and heat exchanger 1 is formed, according to the difference in height, resulting from the inclination of the heat exchanger 1 and a necessary for the filter insert 32 height difference. Preferably, the overflow channel 31 and a space for holding the filter insert 32 are formed on a one-piece tray bottom part 3.

The filter insert 32 is not round as usual, but elongated, for example, at least three or four to at least six times longer than wide. It preferably has a laterally arranged handle for easy removal. Due to the elongated shape of the filter insert 32 can be arranged in a space-saving manner along the edge of the shower tray 10, and projects very little into a standing surface of the lid 4 inside.

Wastewater draining through the filter insert 32 passes into an inlet region 33 in front of the heat exchanger 1. Here, the wastewater is retained by a distributor element 2, wherein the distributor element 2 has an overflow, for example formed by a plurality of distribution openings 21 in a preferably at least approximately vertical barrier. or simply by a horizontal overflow. This overflow causes the waste water to be distributed first in the inlet region 33, before it flows over the overflow and over a drainage surface 17 at the top of the heat exchanger 1 on the heat exchanger 1. FIG. 7 shows a detail of a distribution element 2 in a preferred embodiment of the invention. In addition to the Verteilöfϊhungen 21 here even higher safety overflow openings 22 are shown, which are effective in case of overloading or clogging of Verteilöffhungen 21. In addition, 22 individual drain openings 23 are arranged below the security Überlaufbffhungen. These are located at the bottom of the inlet region 33. In a typical amount of waste water, the flow through the drain openings 23 in any way sufficient to empty the inlet region 33, so that the distribution openings 21 are effective. Only when practically no more wastewater flows in, do the discharge openings 23 cause the part of the inlet region 33 below the distribution openings 21 to empty.

The support ribs 41 preferably run in the direction of drainage of the waste water, ie in the direction of the inclination of the heat exchanger 1 (respectively in the fall line or the direction of greatest slope of the drainage surface 17). As a result, on the one hand in the ideal case, the flow of wastewater is not affected, but if the heat exchanger 1 is not perfectly flat, is prevented by the support ribs 41, that the water runs only along one side of the heat exchanger 1.

After draining via the drainage surface 17, in which the wastewater gives off heat to the heat exchanger 1, the wastewater flows into an outlet region 34 of the trough lower part 3 and can be drained off by a drain (not shown). Due to the very flat design of the heat exchanger 1 is an installation in existing facilities without significant adjustments possible.

The drainage surface 17 may have grooves in the drainage direction, wherein a depth of the grooves is for example 0.5 mm to 2 mm. The cover plate may thus be a flat, structured or unstructured on the surface of its top plate, and also be flat or profiled on the underside. A profile at the bottom may serve to support the plate, and / or to guide water flowing through the heat exchanger.

Figure 5 shows an exploded view of a preferred Ausfuhrungsforrn the heat exchanger 1, and Figure 6 shows an exploded view of the heat exchanger 1 as part of the entire shower tray 10. The heat exchanger 1 has in this embodiment, a cover plate 11, a bottom 12 and an intermediate core 13 , The cover plate 11 has at an upper end an angled portion which forms the distributor element 2. In another embodiment of the invention, the distribution element 2 is formed on the bottom 12. In yet another embodiment, the distribution element 2 is part of the lid 4, and preferably formed integrally on the lid 4, either by protruding downwards, at the same location as the distribution element 2 shown in FIG. 5, or by having it as in FIG. 11 forms a storage channel in the lid 4.

The core 13 preferably has ribs 18 which define a meandering cavity passing through the plane of the heat exchanger 1. The bottom 12 has connection openings 19, through which fresh water flow into the cavity or can flow out of the cavity. The bottom 12 may be provided at the connection openings 19 with connecting pieces 15 for connection of fresh water lines, as well as with bolts 16, by means of which the bottom 12 can be fastened to the bottom part 3. The connecting pieces 15 and bolts 16 lead, for example, through sealed openings in the tub bottom 3. The heat exchanger 1 is preferably connected along its edge, and in particular at the inlet region 33, via a seal with the tub base 3, so that no water can flow under the heat exchanger. In a further embodiment of the invention, however, the heat exchanger 1 is removable for cleaning purposes, as a rule not tool-free. To protect the fresh water side of the heat exchanger 1, this can be provided with a pressure relief valve, which discharges the fresh water into the wastewater area at overpressure. Alternatively or additionally, a pressure reducing valve may be arranged in the fresh water supply line. As a result, the large forces that occur due to the water pressure in the large-area cavities of the heat exchanger 1, reduced.

FIG. 8 schematically shows a cross section through part of a further preferred embodiment of a heat exchanger. Here, the heat exchanger 1 again consists of a flat or flat cover plate 1 1. Below the cover plate 11, one or more meandering tubes 14 are mounted, with a good heat transfer between tubes 14 and cover plate 11, for example by soldering. By way of example, a distribution element 2 formed on the cover plate 11 is also shown here.

Figure 9 shows schematically a cross section through part of another preferred embodiment of a heat exchanger. Again, instead of the fact that a core layer 13 is present, the bottom 12 is formed from a single piece, so that it forms when connecting the cover plate 11 on the one hand connecting portions 43 and on the other hand spaced areas 44, wherein the spaced regions form one or more preferably meandering channels for the fresh water. In the connecting regions 43, the cover plate 11 and the bottom 12 can preferably be connected to one another by welding or soldering. The distribution element 2 is here formed on the bottom 12, so that only a single part must be reshaped.

In a further embodiment of the invention, the cover plate 11, as in the

Figures 8 and 9 shown, two-layered or multi-layered. For example, an upper layer or partial plate made of chrome-nickel steel with a lower layer or Partial plate made of copper or a copper alloy connected. On the lower layer, in turn, the bottom 12 or the tubes 14 are attached. This results in a total of several layers of material, which separate the fresh water from the wastewater, which is mandatory in some countries.

Figure 10 shows schematically another arrangement of support ribs 41 of the cover plate: The support ribs 41 do not run here (as shown by dashed lines) parallel to the slope of the heat exchanger 1 and the drain surface 17, but form baffles or harassment, which turbulence of the effluent and thus effect a better distribution of the water flow over the drainage surface and an improved heat transfer.

11 shows a bottom view of a preferred embodiment of a heat exchanger 1 with meandering tubes 14 according to FIG. 8. Three tubes for guiding the fresh water are connected in parallel between two connecting pieces 15. Alternatively, two or more parallel tubes 14 may be present. This embodiment of the invention with respect to fresh water line, as an alternative to the embodiments of Figures 8 or 9 is arbitrarily combinable with the various embodiments with respect to the design of the shower tray 10.

Figures 12 to 14f show a further preferred embodiment of the invention in various views and sections. In this embodiment of the invention, on the one hand, the cover 4 is preferably formed in one piece and for distributing the waste water over the drainage surface 17. On the other hand, and regardless of the entire shower tray 10 is integrally made of a metal sheet, for example by deep drawing, and forms the bottom of the shower tray 10, the drain surface 17 and the upper heat exchanger surface. Such a shower tray 10 may thus also with other lid shapes, and such a lid 4 wells with differently shaped 10 can be combined. The lid 4 is provided with a molded distribution element 2 in the form of a storage channel 24. Through the distribution channels 25, the wastewater, distributed along the upper edge of the heat exchanger 1, flows onto the drainage surface 17 of the heat exchanger 1. The surface of the cover 4 is global , So seen over the entire cover 4, substantially flat, but can also be slightly cambered or inclined. The cover 4 preferably has indentations 46 formed therein, which lead the waste water over the cover 4 to the distribution element 2 or to the storage channel 24. From the storage channel 24 a plurality of distribution channels 25, distributed along the upper edge of the drainage surface 17, out, so that the non-uniformly reaching into the storage channel 24 wastewater is evenly distributed over the drainage surface 17. Optionally, there is a gutter 26, which is deeper than the distribution channels 25, or small openings are arranged as drainage openings in the bottom of the storage channel 24 (not shown), so that after showering, the storage channel 24 can empty completely through these openings. The lid 4 has a handle opening for easy removal from the shower tray 10. Along the lower end of the drainage surface 17 extends an outlet region 34, which leads the waste water to the outlet 35 of the shower tray 10 (FIG. 13).

FIG. 14b shows a cross section through the same shower tray 10 and through a distribution channel 25. It is easy to see how the lid 4 drops off in one direction and the drainage surface 17 in the opposite direction. Instead of the tubes 14 may also be a guide of the fresh water as shown in Figures 5 or 9. Figure 14c shows a section of a cross-section parallel thereto through the gutter 26. Figures 14d to 14f show sections parallel to the distribution channel 25. It can be seen as the cover 4 by a bulge in the shower tray 10 is supported in the direction of the distribution channel 25 and the overflow to the drainage surface 17 drops off. Outside the aforementioned bulge the overflow channel 31 extends along the edge of the lid 4 around the lid 4 around. Figure 15 shows a cross section through a shower tray 10 with an example solid frame 35 which is connected to the tub base 3, which in turn forms the heat exchanger 1, so that the cover plate 1 1 of the heat exchanger 1 forms the bottom of the shower tray 10. The frame 36 is here open at the bottom, but may also be closed as in the embodiment of the invention of Figure 6 below.

Figure 16 shows a cross section through a shower tray 10 with two heat exchangers Ia, Ib, each with a lid 4 with integrated distribution element 2 in the form of a storage channel 24. Here, the two heat exchangers Ia, Ib are inclined towards each other, and the wastewater enters a common In other preferred embodiments of the invention, the heat exchangers Ia, Ib are inclined away from each other, or there are more than two heat exchangers, for example in the form of four adjacent to each other with the tips Triangles, which together form a rectangle corresponding to the surface of the shower tray.

Figure 17 shows a cross section through a drainage surface 17 of the cover plate 1 1 in a preferred embodiment of the invention. The drainage surface 17 has fine, slightly raised ribs or guide ribs 45, which extend in the direction of the slope of the drainage surface 17. The guide ribs 45 carry the wastewater regularly distributed by the distribution element 2 in controlled paths, so that a certain distribution of the wastewater flow through the drainage surface 17 is maintained even in the event of disturbances. As a result, the water layer remains thin and improves the heat transfer. LIST OF REFERENCE NUMBERS

1 heat exchanger

10 shower tray

1 1 cover plate

12 floor

13 core

14 pipe

15 connecting pieces

16 bolts

17 drainage area

18 ribs

19 connection opening

2 distribution element

21 distribution opening

22 safety overflow opening

23 drain opening

24 reservoir

25 distribution channel

26 gutter

3 bottom part

31 overflow channel

32 filter element

33 inlet area

34 outlet area

35 process

36 frames

4 lids

41 support ribs

42 lid edge

43 connection area

44 spaced area, channel

45 leadership rib

46 deepening

Claims

1. shower tray (10) with a heat exchanger (1), wherein the heat exchanger (1) below the shower tray (10) for heat recovery _^ from waste water for warming fresh water can be arranged, wherein an N first heat exchanger surface (17) in contact with the Sewage and a second

Heat exchanger surface is in contact with the fresh water, characterized in that the first heat exchanger surface (17) forms the bottom or a part of the bottom of the shower tray (10).

2. Shower tray (10) according to claim 1, wherein the heat exchanger (1) has no flow-through wastewater cavities.

3. Shower tray (10) according to claim 1 or 2, wherein all areas of the shower tray (10), which are flowed through by wastewater, are accessible without tools.

4. Shower tray (10) according to one of the preceding claims, comprising a cover (4) which covers the surface of the heat exchanger (1) and serves as a tread, the cover (4) without tools from the shower tray (10) can be removed.

A shower tray (10) according to any one of the preceding claims, comprising a distribution member (2) which is a damming member which retains the waste water along an upper edge of a drainage surface (17) constituting the first heat exchange surface (17), and Overflow along this upper edge forms.

6. Shower tray (10) according to claim 3, wherein the overflow by a plurality of distribution openings (21) or distribution grooves (25) in the distribution element (2) or storage element along the upper edge of the drainage surface (17) is formed.

7. Shower tray (10) according to any one of claims 5 or 6, wherein the distribution element (2) has at least one Ablaufoffnung (23) which is arranged below the overflow, or a drainage channel (26) which extends deeper than the overflow, and after completion of the sewage flow

Run off the in the distribution (2) dammed wastewater causes.

8. shower tray (10) according to one of claims 5 to 7, wherein the drainage surface and the first heat exchanger surface (17) is formed substantially rectangular.

9. shower tray (10) according to one of claims 5 to 8, wherein the distribution element (2) is integrally formed on the cover (4).

10. Shower tray (10) according to claim 9, wherein the distribution element (2) as a storage channel (24) in the cover (4) is formed.

11. Shower tray (10) according to claim 9, wherein the distribution element (2) is a downwardly projecting part of the lid (4).

12. shower tray (10) according to one of the preceding claims, wherein the distribution element (2) is integrally formed on a trough base (3), wherein the trough bottom (3) has a frame for holding the heat exchanger (1) and / or a bottom of Shower tray (10) below the heat exchanger (1) forms.

13. Shower tray (10) according to one of claims 4 to 12, wherein the cover (4) consists of several, in particular two individually removable part covers, each covering a part of the surface of the bottom of the shower tray (10).

14. Shower tray (10) according to any one of claims 5 to 13, wherein the lid (4) has a substantially planar surface, with recesses (46) disposed therein, which the waste water to at least one distribution element (2, 24) in the region of Side of the cover (4).

15. Shower tray (10) according to one of claims 4 to 14, wherein the cover (4) supporting elements, in particular supporting ribs (41), by means of which the lid (4) on the heat exchanger (1) is supported.

16. Shower tray (10) according to claim 15, wherein the support ribs (41) are arranged parallel to the flow of the waste water.

17. Shower tray (10) according to claim 15, wherein the support ribs (41) form baffles or baffles for the sewage flow.

18. Shower tray (10) according to one of the preceding claims, comprising an around a rim of a tub bottom part (3) encircling overflow channel (31), which waste water, which flows over a lid edge (42) of the lid (4), receives and the distribution element ( 2) conducts.

19. Shower tray (10) according to one of the preceding claims, comprising a plurality of heat exchangers (1).

20. Shower tray (10) according to one of the preceding claims, comprising an elongated and in an edge region of the shower tray (10) arranged, removable filter insert (32), wherein a longitudinal direction of the filter insert (32) parallel to an edge of the shower tray (10). extends, and the filter insert (32) preferably in the longitudinal direction at least three times greater extent than perpendicular to it.

21. Heat exchanger (1) for a shower tray (10) preferably according to one of the preceding claims, which heat exchanger (1) in the bottom of the shower tray (10) for heat recovery from waste water for warming fresh water can be arranged, characterized in that the heat exchanger ( 1) has a globally flat surface as drainage surface (17) over which the wastewater runs.

22. Heat exchanger (1) according to claim 21, wherein the distribution element (2) is a bent-up portion of a sheet, from which sheet a

Cover plate (11) or a bottom (12) or a core (13) of the heat exchanger (1) is formed.

23. Heat exchanger (1) according to claim 21 or 22, wherein the drainage surface (17) has grooves or ribs (45) which are mounted in the shower tray (10) or integrated heat exchanger (1) in the direction of inclination of the drainage surface (17). run.

24. Heat exchanger (1) according to claim 21 or 22, wherein the drainage surface (17) is not structured in the flow direction.