DE102010001344A1 - Heat transfer module for a dishwasher - Google Patents

Abstract

A heat transfer module for using heat energy from waste water (AW) of a dishwasher (1), in particular from waste water (AW) from a domestic dishwasher (1), is proposed, which is designed as a structural unit (2) that can be arranged outside a housing (3) of the dishwasher (1) which is in a water inlet device (7, 8, 9) of the dishwasher (1) designed for receiving inlet water (ZW) from an external water supply (WH) and in a water outlet device (AW) for delivering waste water to an external waste water disposal (A) trained water drainage device (11, 12, 13) of the dishwasher (1) can be coupled in, and which comprises a heat transfer device (16) for transferring thermal energy from the waste water (AW) to the feed water (ZW).

Description

The present invention relates to a heat transfer module for the use of heat energy from wastewater of a dishwasher, in particular from wastewater of a domestic dishwasher.

It is known that the wastewater of a dishwasher contains a substantial part of the energy absorbed in the course of carrying out a rinse cycle in the form of heat energy. In today's conventional dishwashers, the wastewater is discharged to an external sanitation and discharged through them. The heat energy carried along by the wastewater remains unused as a rule. Facilities for the use of heat energy have already been proposed. However, these are too expensive for practical use and possibly allow the use of a small part of the heat energy of the wastewater.

A disadvantage of the known devices for the use of heat energy from wastewater is in particular that the achievable benefit is in such an unfavorable ratio to the effort that an economic operation is not possible.

The object of the present invention is to improve the efficiency of the use of heat energy from wastewater in a dishwasher, in particular domestic dishwasher.

The object is achieved in a heat transfer module of the type mentioned above in that it is designed as an outside of a housing of the dishwasher assembly which is formed in a trained for receiving feed water from an external water supply water inlet device of the dishwasher and in a waste water to a external waste water disposal trained water drainage device of the dishwasher can be coupled, and which includes a heat transfer device for transferring heat energy from the wastewater to the feed water.

A water inlet device of a dishwasher makes it possible to direct feed water from an external water supply into the interior of the dishwasher, so that it can be used there for washing dishes. The external water supply may be a faucet of a building water installation. The water inlet device may have at its upstream end a connector for connection to the external water supply. Downstream of the connecting piece, the water inlet device may comprise a water supply line, which is designed, for example, as a flexible water inlet hose. Furthermore, the water inlet device may comprise a connection piece arranged on an outer wall of the dishwasher, which is connected to the downstream end of the water supply line.

In contrast, a water drainage device of a dishwasher serves to discharge water that is no longer needed, for example soiled water, as wastewater from the inside of the dishwasher to an external wastewater disposal. The external wastewater disposal may be a wastewater pipe of a building-side wastewater installation. The water drainage device of the dishwasher may have at its upstream end a connection piece which is arranged on an outer wall of the dishwasher. Downstream of the device-fixed connection piece of the water drainage device may be provided a water drain line, which may be formed in particular as a flexible water drainage hose. At the downstream end of the water drain line may be formed a connection piece for connection to the external sanitation.

The heat transfer module according to the invention is designed as an independent unit, which outside the outer walls of the dishwasher, d. H. externally of this, can be arranged separately so that it can be coupled both in the water inlet device and in the water drainage device. The heat transfer module is designed so that a transfer of heat energy from wastewater, which is discharged via the water drainage device, to feed water, which is received via the water inlet device, is possible.

By the transfer of heat energy from the wastewater to the feed water, a high proportion of the heat contained in the wastewater can be used. This is especially true in comparison to heat transfer modules, which are coupled on the building side in the water installation and the wastewater installation. The reason for this is, in particular, that the waste water of the dishwasher cools only slightly until it enters the water outlet device and therefore has a comparatively high temperature. In this way, a particularly large part of the heat energy originally contained therein can be taken from the wastewater. On the other hand, the inlet water heated by means of the heat transfer module according to the invention cools only to an extremely small extent on its way into the interior of the dishwasher, since the water to be overcome hereby has to be overcome Distance can be kept very short. This makes it possible to make practically all the heat energy transferred to the feed water usable during a wash cycle in the interior of the dishwasher.

The heat transfer module according to the invention can be arranged, for example, between the back of the dishwasher and a building-side wall. If the dishwasher is integrated in a kitchenette, the heat transfer module can be accommodated in particular in a base area of the kitchen unit below the dishwasher or in a cabinet adjacent to the dishwasher.

Since the heat transfer module according to the invention is designed as an external unit which can be arranged separately outside the outer walls, in particular outside a possibly existing housing, it can be used in known dishwashing machines without these having to be substantially adapted in terms of design. In particular, it is not necessary to change the design of the known dishwashers so that a free space for receiving the heat transfer module is formed. The heat transfer module according to the invention can be used in particular also in dishwashers with compact housing dimensions, which would not allow installation of a heat transfer module.

Overall, the heat transfer module of the type described here allows the use of heat energy from wastewater of a dishwasher with a high efficiency. The heat transfer module is simple and can be used with almost any dishwasher without significant structural changes to the respective dishwasher. In this way, an economical use of heat energy from wastewater of a dishwasher is possible.

According to an expedient development of the invention, it is provided that the heat transfer device is designed as a heat exchanger having a primary chamber through which sewage can flow and a secondary chamber through which feed water flows, wherein the primary chamber and the secondary chamber are connected in a heat-conducting manner. Primary chamber and secondary chamber, for example, be separated from each other by a heat-conducting partition, in particular a heat-conducting partition made of metal. Metal has a high thermal conductivity, which favorably influences the heat transfer from the waste water to the feed water. However, other materials with a high thermal conductivity are also suitable. The partition wall can meander-shaped, in order to achieve a large heat transfer area even with compact dimensions of the heat transfer module can.

With a suitable design of the heat exchanger, in particular the partition, a high efficiency of the heat transfer module can be achieved at the same time simple and inexpensive construction. In such a heat exchanger is also ensured in a simple manner that an undesirable mixing of wastewater and feed water is prevented.

According to an advantageous development of the invention, the primary chamber is associated with an input-side coupling piece and / or an output-side coupling piece for coupling the primary chamber into the water drainage device. Alternatively or additionally, the secondary chamber is associated with an input-side coupling piece and / or an output-side coupling piece for coupling the secondary chamber into the water inlet device. The coupling pieces can be designed as connecting pieces, screw connections, latching connections or the like. The coupling pieces may be formed differently from each other, so that confusion when coupling the heat transfer module in the water drainage device of the dishwasher and / or in the water inlet device of the dishwasher can be prevented. Overall, the coupling pieces allow easy assembly or disassembly of the heat transfer module.

According to an expedient development of the invention, the primary chamber and / or the secondary chamber each have a volume which substantially corresponds to the water quantity required for the respective water-conducting partial rinse cycle of a rinse cycle. A water-conducting partial wash cycle is understood to be a phase of a wash cycle of a selected dishwasher program for cleaning items to be washed, during which the items to be washed are treated with water, in particular without the water used being exchanged. A rinse cycle, which is carried out by the respective selected dishwashing program, generally comprises a plurality of water-carrying partial rinses, wherein, for example, a pre-rinse cycle, a cleaning rinse cycle, an intermediate rinse cycle and a rinse cycle can be provided.

If the volume of the primary chamber substantially corresponds to the amount of waste water discharged after a water-carrying partial wash cycle, then the primary chamber can after one water-carrying Teilspülgang be substantially completely filled with the waste water of the respective Teilspülgangs. Previously located in the primary chamber wastewater can be almost completely displaced in most cases. This causes a filling of the primary chamber with wastewater, which has a particularly high temperature. In this way, the heat output of the wastewater can be optimized. If, furthermore, the volume of the secondary chamber essentially corresponds to the volume of water required for a water-conducting partial wash cycle, it is ensured that the heat energy released by the wastewater is delivered precisely to the required amount of feed water. In this way, the use of heat energy from the wastewater can be optimized.

Expressed in general terms, an optimization of the heat transfer can be ensured if the amount of feedwater to be heated in the secondary storage tank substantially corresponds to or is smaller than the wastewater quantity in the primary storage, ie. H. at most as large as the wastewater quantity in the primary storage is. This allows the Zulaufwassermenge be brought to about the temperature level of the discharge water amount.

According to an advantageous embodiment of the invention, the volume of the primary chamber and / or the secondary chamber in each case between 0.5 liters and eight liters, preferably between 1.0 liter and six liters, more preferably between two liters and four liters. The ranges mentioned for the volume of the primary chamber or for the volume of the secondary chamber offer a good compromise between the heat energies which can be transmitted in practice when operating a dishwasher and the volume of construction to be provided for the primary chamber and / or secondary chamber in the heat transfer module.

Possibly. it may already be sufficient if only a subset of the discharged after a water-conveying Teilspülgangs wastewater in the primary chamber of the heat exchanger is cached to deliver their heat to feed water in the secondary chamber. Additionally or independently thereof, the energy efficiency of the dishwasher can already be improved if the secondary chamber is only so large that only a subset of required for a Teilspülgang inlet water is preheated by the heat transfer from cached in the primary chamber wastewater. As a result, the heat transfer module can have particularly compact dimensions.

In particular, it may also be expedient if the receiving volume of the primary chamber is chosen so large that in it the wastewater of several or preferably all Teilspülgänge an ongoing rinse cycle can be cached. In that case, it is then possible to store in the primary chamber the wastewater quantities of a plurality of, in particular at least two, successive partial rinses of the rinse cycle of a selected dishwashing program to be carried out for heat release to the feed water in the secondary chamber. If the volume of the secondary storage and thus the cached inlet water amount is smaller than the volume of the primary storage and thus smaller than the temporarily stored in this wastewater, the feed water can bring improved to the temperature level of the wastewater, as this with only equal volumes of primary chamber and secondary chamber would be the case.

Additionally or independently thereof, it may possibly also bring energy benefits if the receiving volume of the secondary chamber for receiving a Zulaufwassermenge is dimensioned so that in the secondary chamber, the total amount of water several, in particular at least two Teilspülgänge a temporally subsequent wash cycle of a new, d. H. temporally later started dishwashing program for preheating by the wastewater can be cached.

According to an expedient development of the invention, the heat exchanger can be designed as a countercurrent heat exchanger. In a heat exchanger designed as a countercurrent heat exchanger, the waste water and the feed water are brought past one another in an accommodating manner. Compared to a DC heat exchanger in which the wastewater and the feed water are guided side by side in the same direction, a countercurrent heat exchanger has a higher efficiency, so that a total of a larger proportion of the heat energy contained in the wastewater can be transferred to the feed water.

According to a particularly advantageous embodiment of the invention, the heat transfer device may comprise a heat storage. A heat accumulator is particularly advantageous if a longer period elapses between the introduction of the waste water into the heat transfer module and the removal of the feed water from the heat transfer module. This case occurs, for example, when the wastewater of the last water-carrying Teilspülganges is introduced during this first wash cycle in the heat recovery module, but the heat transfer module is removed only during a later performed second wash inlet water for a water-bearing rinse. The heat storage Conveniently consists of a material with a high heat storage capacity. It can be arranged in the region of a dividing wall which separates the primary chamber and the secondary chamber. Likewise, the heat accumulator may be part of the partition. In this way, the heat storage can absorb heat energy from the wastewater and deliver it to the feed water. Overall, the overall benefit of the heat transfer module can be improved by a heat storage.

According to an expedient development of the invention, the heat accumulator is designed as a solid heat storage. A solid heat storage consists at least substantially of a material which assumes a solid state of matter in the temperature range occurring. Suitable materials are predominantly materials with a high specific heat storage capacity. Particularly suitable metals are, for example, aluminum or copper. A trained as a solid heat storage heat accumulator can be easily integrated into the partition, which separates the primary chamber from the secondary chamber, or form this. Solid state heat storage are comparatively easy to produce and can simultaneously absorb sufficient heat energy.

According to an advantageous embodiment of the invention, the heat storage can be designed as latent heat storage. In this case, a latent heat accumulator is understood as meaning such a heat accumulator in which utilization of the enthalpy of reversible thermodynamic changes in state of a storage medium takes place. For example, in a latent heat storage, the release of heat energy in a phase transition from a liquid to a solid state or the binding of heat energy in a transition from a solid to a liquid state of a storage medium storage medium can be exploited. Suitable storage media are, in particular, salt hydrates and / or paraffins. The advantage of such a phase transition heat accumulator is that a high amount of thermal energy can be stored in a small amount of the storage material in a temperature range determined by the melting temperature of the used storage material. However, the latent heat storage may also be based on a reversible chemical reaction. Here, in particular sorption processes can be used. In such a thermo-chemical heat storage even higher energy densities can be achieved.

In the heat transfer module according to the invention, the latent heat accumulator can be integrated in a partition that separates the primary chamber from the secondary chamber. Thus, this partition may include an outer wall facing the primary chamber, for example made of aluminum, and an outer wall facing the secondary chamber, which may also be made of aluminum, wherein a cavity formed therebetween may be filled with a latent heat storage material based on salt or paraffin. As a result, heat energy released by the wastewater can be stored over a long period of time in a simple manner.

According to an advantageous embodiment of the invention, the heat transfer module is prepared for mounting on a wall. For this purpose, the heat transfer module may have attachment portions, which may be formed, for example, as fastening tabs. The attachment portions may include attachment holes and / or slots for securing the heat transfer module to a wall with screws, hooks, or the like. This makes it possible in a simple manner, the heat transfer module to save space on a building wall or on a wall unit.

According to a further expedient development of the invention, the heat transfer module can be prepared for placement on a horizontal surface. For this purpose, adjusting sections, for example adjustable feet, can be provided. This makes it possible to place the heat transfer module without further attachment to a floor, such as a building floor or cabinet floor.

According to an advantageous development of the invention, the heat transfer module has a substantially closed housing. The housing can in particular serve to protect the heat transfer device against dirt and / or damage. Such a housing allows the placement of the heat transfer module regardless of the presence of protective cabinets and the like. As a result, the possible applications of the heat transfer module are extended. In addition, mounting portions for wall mounting and / or adjusting sections for setting up the heat transfer module can be formed on a floor on the housing in a simple manner.

According to a particularly advantageous embodiment of the invention, an insulation is provided for the heat transfer module, which counteracts a release of heat energy from the wastewater and / or the feed water to the outside. In this way, the efficiency of the heat transfer module can be improved. The insulation can be particularly in the range of Housing of the heat transfer module may be provided.

The reproduced in the dependent claims and / or above advantageous embodiments of the heat transfer module according to the invention may be provided individually or in any combination with each other in the heat transfer module according to the invention.

Furthermore, the invention relates to a dishwasher, in particular a domestic dishwasher, with at least one water inlet device for receiving feed water from an external water supply and at least one water drain device for discharging waste water to an external Abwassererntsorgung. In such a dishwasher, the initially stated object is achieved in that it is prepared for coupling of a heat transfer module according to the invention in the water inlet device and in the water drainage device.

According to an expedient development of the invention, the water inlet device has a coupling piece corresponding to an input-side coupling piece of a secondary chamber of the heat-transfer module and / or a coupling piece corresponding to an output-side coupling piece of the secondary chamber. Additionally or alternatively, it can be provided that the water drainage device has a coupling piece corresponding to an input-side coupling piece of a primary chamber of the heat-transfer module and / or a coupling piece corresponding to an output-side coupling piece of the primary chamber. In this way, a heat transfer module can be coupled into the water inlet device and / or into the water drain device of the dishwasher in a simple manner. In particular, such a delivered without heat transfer module dishwasher can be subsequently provided with a heat transfer module.

According to an expedient development of the invention, a control device for controlling rinses for cleaning items to be washed is provided for the dishwasher, which has a first mode and a second mode for performing rinses, wherein the first mode for operation without coupled heat transfer module and wherein the second Operating mode is provided for operation with coupled heat transfer module. By providing at least two operating modes, it is possible to take into account the fact that the temperature of the feed water fed into the interior of the dishwasher is higher when the heat transfer module is coupled in, than when the heat transfer module is not coupled in. This makes it possible to ensure that a rinse cycle can be performed efficiently both when the heat transfer module is coupled in and when the heat transfer module is not coupled in. Efficiency is understood here in particular to mean that a predefined rinsing result can be achieved with the least possible expenditure of time and / or energy. The selection of the operating mode can take place, for example, at an operating interface of the dishwasher provided for operation by an operator. It can also be provided that the operating mode is set by means of a device which is provided only for operation by maintenance personnel.

According to an advantageous development of the invention, in the second operating mode at least one control parameter of the wash cycle is changed in comparison to the first operating mode. In this case, a control parameter of the wash cycle is understood to be any parameter which is used by the control device to control a sequence of wash cycles in order to influence this process. Such a control parameter may, for example, be a control parameter for specifying a power of a heater of the dishwasher, a control parameter for specifying the duration of a section of the wash cycle or the like.

According to an advantageous development of the invention, the dishwasher is designed for simultaneous intake of feed water and discharge of wastewater. In this way, a release of heat energy to the environment can be reduced, so that the transition of heat energy from the wastewater to the feed water can be optimized. To realize this function, the dishwasher may comprise a supply water storage in which the feed water can be stored until the waste water is completely pumped out of the dishwasher. In this way it can be prevented that mix feed water and drain water inside the dishwasher.

The reproduced in the dependent claims and / or above advantageous embodiments of the dishwasher according to the invention may be provided individually or in any combination with each other in the dishwasher according to the invention.

In a further aspect, the present invention relates to an arrangement with a dishwasher, in particular with a domestic dishwasher, and with a Heat transfer module for the use of heat energy from waste water of the dishwasher.

In the arrangement according to the invention it is provided that at least the dishwasher or at least the heat transfer module is designed according to the invention.

The invention in its developments and their advantages will be explained in more detail with reference to drawings. Each show schematically:

1 FIG. 2: an advantageous exemplary embodiment of an arrangement according to the invention in a schematic spatial view,

2 a functional sketch for an advantageous embodiment of a

inventive arrangement and

3 : A functional sketch for a second advantageous embodiment of the arrangement according to the invention.

In the following figures, corresponding parts are provided with the same reference numerals. Only those components of an arrangement according to the invention are provided with reference numerals and explained which are necessary for the understanding of the invention. It goes without saying that the arrangement according to the invention can comprise further parts and assemblies.

1 shows an advantageous embodiment of an inventive arrangement, which is a dishwasher 1 and a heat transfer module 2 includes. The dishwasher 1 is designed for cleaning items to be washed using rinsing liquid, in particular for cleaning dishes.

The dishwasher 1 has a housing 3 in which a rinse tank 4 is arranged. The washing container 4 is a door 5 assigned, which allows dishes in the washing 4 or to be taken from it. With the door closed 5 arises inside the washing container 4 a substantially closed rinsing chamber 6 , Possibly. can the outer case 3 partially or completely omitted. This is the case in particular with built-in dishwashers. The outer walls of the dishwasher can then be formed for the most part only by the walls of the washing.

To the required for the formation of a rinsing liquid for rinsing items to be washed into the interior of the housing 3 the dishwasher 1 to be able to conduct, is a water inlet device 7 . 8th . 9 intended. The water inlet device 7 . 8th . 9 has a fitting at its upstream end 7 on, which is intended to be connected to a faucet, which serves as an external water supply WH. The faucet can be part of a building-side water installation. Downstream connects to the connector 7 a water supply line 8th on, which is designed as a flexible water inlet hose. At its downstream end is the water inlet hose 8th with a device-fixed connection piece 9 connected. In this way it is with the water inlet device 7 . 8th . 9 possible, feed water from the external water supply WH in the interior of the dishwasher 1 to lead. Here, the inlet water over in 1 not shown means in the washing chamber 6 be directed. It may, if necessary, with cleaning agents, cleaning aids, rinse aids, and / or other additives such. For example, salts, softeners are added and used as a rinsing liquid for acting on the items to be washed.

For loading the items to be washed a circulating pump, not shown, is provided, which makes it possible, due to their weight in a collecting pot 10 collecting rinse liquid to apply via a spray system not shown on the dishes. The circulation pump can also be in or at the collecting pot 10 be arranged.

To a no longer needed or usable rinsing liquid, for example because it is heavily contaminated, as waste water from the inside of the dishwasher 1 To be able to pump, a wastewater pump, not shown, may also be provided, the input side of the collecting pot 10 connected is. The wastewater pump can also be in or on the collecting pot 10 be arranged.

The sewage pump is in the embodiment with means not shown with a water drainage device 11 . 12 . 13 connected. The water drainage device 11 . 12 . 13 can, as in 1 shown one on the case 3 the dishwasher 1 arranged device-fixed connection piece 11 , a water drainage pipe 12 and a connector 13 include. The device-fixed connection piece 11 forms the upstream part of the water drainage device 11 . 12 . 13 , This is followed by a water drainage line 12 at, which may be formed in particular as a flexible water drainage hose. At the downstream end of the water drain line 12 is the connector 13 arranged in which 1 intended to be connected to an external sanitation A, which may be a sewer pipe of a building-side sewage installation. In 1 are these device-fixed connection piece 9 the water inlet device 7 . 8th . 9 and the device-fixed connection piece 13 the water drainage device 11 . 12 . 13 at the back of the case 3 the dishwasher 1 arranged. The device-fixed connection piece 9 and the device-fixed connection piece 11 however, could be elsewhere on the dishwasher 1 be arranged.

The dishwasher 1 further comprises a control device 14 for controlling rinses for cleaning items to be washed. The control device 14 In particular, it can be embodied as a sequence control device, which is designed to control a sequence of a rinse cycle on the basis of a selectable rinse program. The control device 14 is in connection with a user interface 15 , which for the operation of the dishwasher 1 provided by an operator. The user interface 15 can be next to one to operate the dishwasher 1 provided input unit also include an output unit for outputting information to the operator.

In the embodiment of 1 are both the control device 14 as well as the operating device 15 in the field of the door 5 the dishwasher 1 arranged. However, it would also be possible to use the control device 14 and the user interface 15 to arrange in another place.

The heat transfer module 2 is as an independent unit 2 executed and outside the outer walls of the dishwasher, here in the embodiment through the walls of the housing 3 the dishwasher 1 are formed, arranged. Therefore, must be inside the case 3 the dishwasher 1 no precious space for the heat transfer module 2 be provided. The heat transfer module 2 is both in the water inlet device 7 . 8th . 9 as well as in the water drainage device 11 . 12 . 13 the dishwasher 1 coupled. The heat transfer module 2 includes an in 1 only indicated heat transfer device 16 , which for the transmission of heat energy through the water drainage device 11 . 12 . 13 guided wastewater on the water inlet device 7 . 8th . 9 guided inlet water is formed.

The heat transfer device 16 is as a heat exchanger 16 formed, which can be flowed through by a sewage primary chamber 17 and a secondary chamber through which feed water can flow 18 having, wherein the primary chamber 17 and the secondary chamber 18 are thermally conductively connected. The primary chamber is 17 in the embodiment of 1 in the water drainage line 12 the water drainage device 11 . 12 . 13 coupled.

The coupling of the primary chamber 17 in the water drainage line 12 takes place by means of one of the primary chamber 17 Input side associated coupling piece 19 and by means of one of the primary chamber 17 output side associated coupling piece 20 , The input-side coupling piece 19 the primary chamber 17 is with a corresponding coupling piece 21 connected to an exit of an upstream section 12a the water drainage line 12 is arranged. Furthermore, the output side coupling piece 20 the primary chamber 17 with a corresponding coupling piece 22 connected to an input side of a downstream section 12b the water drainage line 12 is arranged. In this way it is possible to waste water from the collecting pot 10 via the housing-fixed connection piece 11 , over the upstream section 12a the water drain line, via the primary chamber 17 and over the downstream section 12b the water drainage line 12 to the sewage pipe A to lead.

Likewise, the secondary chamber 18 an input-side coupling piece 23 assigned, which with a corresponding coupling piece 24 connected to an exit of an upstream section 8a the water supply line 8th is arranged. The secondary chamber 18 is also an output side coupling piece 25 assigned, which with a corresponding coupling piece 26 connected, which at the entrance of a downstream section 8b the water supply line 8th is trained. In this way it is possible to feed water from the external water supply WH via the upstream section 8a the water supply line 8th , via the secondary chamber 18 , over the downstream section 8b the water supply line 8th and over the housing-fixed connector 9 in the interior of the dishwasher 1 to lead.

In the embodiment of 1 include those on the heat transfer module 2 trained couplings 19 . 20 . 23 . 25 Connecting piece, on which the corresponding coupling pieces 21 . 22 . 24 . 26 are plugged. The corresponding coupling pieces 21 . 22 . 24 . 26 can be formed in a simple manner by the respective hose end and fixed, for example, with hoses on the connecting piece. The couplings 19 . 20 . 23 . 25 of the heat transfer module 2 But also with the corresponding coupling piece 21 . 22 . 24 . 26 form a screw connection, a snap connection, a latching connection or the like.

The couplings 19 . 20 . 23 . 25 of the heat transfer module 2 are on a substantially closed housing 27 of Heat transfer module 2 arranged, which is the interior of the heat transfer module 2 protects against dirt and damage. At the housing 27 are still attachment sections 28 formed, which is an assembly of the heat transfer module 2 allow on a wall. The attachment sections 28 For example, they may be formed as mounting tabs with mounting holes. Further, on the housing 27 parking sections 29 provided, which are exemplified as adjustable feet. They allow the installation of the heat transfer module 2 on a floor, keeping a secure stand of the heat transfer module 2 guarantee.

In 1 is the heat transfer module 2 in the here in the embodiment designed as a flexible hose water supply line 8th and in the here in the embodiment designed as a flexible hose water drain line 12 coupled. In this way, the heat transfer module 2 be placed flexibly. But it is also possible, the heat transfer module 2 in the device-fixed connection piece 9 and / or in the device-fixed connector 11 couple. It would also be possible to use the heat transfer module 2 upstream of the device-fixed connector 9 and / or the device fixed connector 11 to couple via separate lines in the water inlet device and / or in the water drainage device.

2 shows a functional diagram of an embodiment of an inventive arrangement, which is a dishwasher 1 and a heat transfer module 2 shows. The elements of in 2 shown function sketch can according to the type of spatial representation of 1 be arranged.

According to the 2 has the dishwasher 1 a line 30 on, which with the device fixed connector 9 the water inlet device 7 . 8th . 9 connected is. A downstream end of the pipe 30 flows into the rinsing chamber 6 , Downstream of the housing-fixed connection piece 9 is in the lead 30 an inlet valve 31 integrated. The inlet valve 31 is via a control line 32 by the control device 14 the dishwasher 1 controllable. Downstream of the inlet valve 31 is a non-return valve 33 in the pipe 30 arranged. The non-return valve 33 is for example as a pipe interruption 33 designed and prevents that in a resulting from dynamic processes in the external water supply WH negative pressure water, such as feed water or sewage, from the dishwasher 1 back to the external water supply WH flows.

Downstream of the non-return valve 33 is a supply water tank 34 intended. This can take at least the amount of inlet water ZW, which is required for a water-carrying Teilspülgang a rinse cycle. Downstream of the inlet water tank 34 in turn is a drain valve 35 into the pipe 30 integrated, which via a control line 36 by the control device 14 is controllable. The drain valve 35 allows it in the feed water tank 34 stored feed water as needed in the washing chamber 6 to lead.

Another line 37 connects the collecting pot 10 with the device-fixed connection piece 11 the water drainage device 11 . 12 . 13 , In the further line 37 is a wastewater pump 38 , also called lye pump, integrated. The sewage pump 38 is via a control line 39 also by the controller 14 controllable.

The user interface 15 and the controller 14 are also via a data line 40 connected with each other. The data line 40 can be designed bidirectionally, so that, for example, operating commands from the user interface 15 to the control device 14 and in the reverse direction of the controller 14 to the user interface 15 Information can be transmitted to the operator.

The control device 14 serves to control rinses for cleaning items to be washed. It has a first operating mode and a second operating mode for carrying out rinse operations, the first operating mode for operation without a coupled heat transfer module 2 and a second mode is provided for operation with the heat transfer module coupled. The respective operating mode can be accessed via the user interface 15 be selected by the respective operator. In the second operating mode, at least one control parameter for carrying out rinsing operations is changed relative to the corresponding parameter of the first operating mode. Such a control parameter may, for example, be a control parameter that influences the duration of a water-conducting partial wash cycle. Likewise, it may be a control parameter which influences a heating device, not shown, for heating a rinsing liquor formed with the aid of feed water. In this way it can be taken into account that the temperature of the feed water ZW is coupled with the heat transfer module 2 usually higher than uncoupled heat transfer module 2 ,

The primary chamber 17 and the secondary chamber 18 of the heat transfer module 2 are by a meandering running, heat-conducting partition 41 separated from each other. The partition wall 41 may for example consist of metal, in particular of aluminum, since such a good heat transfer from the wastewater AW to the inlet water ZW is possible. At the housing 27 of the heat recovery module 2 is a laminar insulation 42 provided, which a release of heat energy from the interior of the heat transfer module 2 counteracts the environment.

The heat recovery from wastewater AW of the dishwasher 1 Let us now explain:
In many cases, it is provided at the end of a water-carrying Teilspülgangs in the washing chamber 6 Rinse liquid to be supplied as wastewater AW an external sanitation A. For this purpose, by the control device 14 the sewage pump 38 switched on. In this way, wastewater from the washing chamber 6 over the collecting pot 10 and the line 37 to the housing-fixed connection piece 11 , From there it gets over the upstream section 12a the water drainage line 12 in the primary chamber 17 directed. From there it passes over the downstream section 12b the water drainage line 12 into the sewage pipe A.

At the same time as switching on the wastewater pump 38 becomes the inlet valve 31 open. In this way, feed water ZW passes from the external water supply WH via the upstream section 8a the water supply line 8th in the secondary chamber 18 and from there via the downstream section 8b the water supply line 8th for device-fixed connection piece 9 , From there it will be over the line 30 in the supply water tank 34 directed. Because at this time the drain valve 35 is closed, the supply water tank 34 so filled with inlet water ZW.

While the sewage AW and the inlet water ZW through the heat transfer module 2 are guided, there is a heat transfer from the wastewater AW on the heat-conducting partition 41 and from the now heated partition 41 to the inlet water ZW. Waste water AW and feed water ZW are in countercurrent to the heat-conducting partition wall 41 passed over, so that in the best case, the heat transfer module 2 leaving inlet water ZW has the temperature which the wastewater AW on entering the heat transfer module 2 Has. In this way, a very large part of the heat energy entrained by the wastewater AW can be transferred to the feed water ZW. This is further promoted by the fact that the delivery of wastewater AW and the intake of feed water ZW occur simultaneously. Thus, the heat transfer takes place directly from the flowing wastewater to flowing inlet water. As a result, on the one hand, the heat transfer resistances from the wastewater to the partition wall 41 and from the partition 41 be reduced to the feed water ZW, on the other hand, so little heat energy goes through the insulation 42 and the case 27 lost to the outside.

The possibility of simultaneous discharge of wastewater AW and increase of feed water ZW is in the embodiment of the 2 through the inlet water tank 34 allows, with appropriate control of the drain valve 35 prevents being inside the dishwasher 1 Mix inlet water ZW and waste water AW.

When in the collection pot 10 no sewage AW is more, the sewage pump can 38 switched off and the drain valve 35 in the pipe 30 be opened. In this way, this gets into the feed water tank 34 stored and now heated inlet water ZW in the washing chamber 6 and is there to form a rinsing liquid for a subsequent water-conducting Teilspülgang available. After the last water-carrying partial rinse cycle of a rinse, the feed water ZW as long as in the supply water tank 34 are left until a rinsing liquid for a water-carrying partial rinse a subsequent rinse is needed.

3 shows a functional diagram for a second advantageous embodiment of an arrangement according to the invention, which is a dishwasher 1 and a heat transfer module 2 includes. The basic structure corresponds to the embodiment of 2 , so that in the following only the modifications made are explained. In the embodiment of 3 is the partition wall 41 which the primary chamber 17 and the secondary chamber 18 of the heat transfer module 2 separates, from several layers. This is the way the partition wall points 41 an outer wall 43 , which is the primary chamber 17 facing and an outer wall 44 , which is the secondary chamber 18 turned on, on. Between the outer walls 43 and 44 there is a heat storage 45 , While the outside walls 43 and 44 consist of a thin sheet metal, it is the heat storage 45 to a latent heat storage, which consists for example of a salt hydrate and / or paraffin. In contrast to the previous embodiment, the dishwasher 1 in the embodiment of 3 no supply water tank 34 on. Therefore, a modified operation is provided, which will be explained in the following:
At the end of a water-carrying Teilspülgangs a rinse cycle as already described, the sewage pump 38 turned on, and thereby wastewater AW through the heat transfer module 2 directed. Here, however, the inlet valve remains 31 closed to prevent being in the collection pot 10 Inlet water ZW and wastewater AW can mix. The heat energy entrained by the wastewater AW is at least a substantial part of the heat storage 45 transfer. When all the wastewater from the collection pot 10 is pumped off, the inlet valve 31 open, allowing inlet water ZW through the heat transfer module 2 flows. Here, the feed water ZW takes heat energy from the heat storage 45 and still in the primary chamber 17 located wastewater AW on. The heat storage 45 is particularly advantageous if between the pumping of the wastewater AW and receiving Zulaufwasser ZW is a greater period of time, which may occur, for example, when with the last wastewater AW a first wash inlet water ZW a later second wash cycle to be heated.

An inventive heat recovery module allows the heat recovery from the wastewater of a fully automatic dishwasher. The heat recovery module can be designed so that it can accommodate the respective volume for each bath or Teilspülgangmenge to be discharged wastewater and incoming fresh water. It provides optimal heat transfer between the fresh water pipe and the sewer pipe, which ensures a high heat transfer. The heat recovery module may include a countercurrent heat exchanger and / or a latent heat storage.

LIST OF REFERENCE NUMBERS

1

dishwasher

2

Heat Transfer Module

3

casing

4

rinse tank

5

door

6

rinsing chamber

7

connector

8th

Water supply line, water inlet hose

9

fixed housing

10

collecting pot

11

fixed housing

12

Water drainage pipe, water drain hose

13

connector

14

control device

15

Operator interface

16

Heat transfer device

17

primary chamber

18

secondary chamber

19

input coupling piece

20

output coupling piece

21

corresponding coupling piece

22

corresponding coupling piece

23

input coupling piece

24

corresponding coupling piece

25

output coupling piece

26

corresponding coupling piece

27

casing

28

Mounting sections, fastening straps

29

Adjustments, leveling feet

30

management

31

inlet valve

32

control line

33

Rücksaugverhinderer

34

Feed water tank

35

drain valve

36

control line

37

management

38

Lye pump, sewage pump

39

control line

40

data line

41

heat-conducting partition

42

insulation

43

outer wall

44

outer wall

45

heat storage

A

external sanitation, sewage pipe

WH

external water supply, faucet

AW

sewage

ZW

water supply

Claims (15)

Heat transfer module for the use of heat energy from wastewater (AW) of a dishwasher ( 1 ), in particular from wastewater (AW) of a domestic dishwasher ( 1 ), characterized in that it is considered outside a housing ( 3 ) of the dishwasher ( 1 ) can be arranged ( 2 ) which is embodied in a water feed device (FIG. 2) for receiving feed water (ZW) from an external water supply (WH) (US Pat. 7 . 8th . 9 ) of the dishwasher ( 1 ) and in a drainage device (A) for discharging wastewater (AW) to an external wastewater disposal (A) 11 . 12 . 13 ) of the dishwasher ( 1 ), and which is a heat transfer device ( 16 ) for transferring heat energy from the wastewater (AW) to the feed water (ZW). Heat transfer module according to one of the preceding claims, characterized in that the heat transfer device ( 16 ) as a heat exchanger ( 16 ) is formed, the one through wastewater (AW) can flow through primary chamber ( 17 ) and a through Zulaufwasser (ZW) through-flow secondary chamber ( 18 ), wherein the primary chamber ( 17 ) and the secondary chamber ( 18 ) are thermally conductively connected. Heat transfer module according to claim 1, characterized in that the primary chamber ( 17 ) an input-side coupling piece ( 19 ) and / or an output-side coupling piece ( 20 ) for engaging the primary chamber ( 17 ) in the Water drainage device ( 11 . 12 . 13 ), and / or that of the secondary chamber ( 18 ) an input-side coupling piece ( 23 ) and / or an output-side coupling piece ( 25 ) for engaging the secondary chamber ( 18 ) into the water inlet device ( 7 . 8th . 9 ) assigned. Heat transfer module according to one of claims 2 or 3, characterized in that the primary chamber ( 17 ) and / or the secondary chamber ( 18 ) each having a volume which corresponds to the amount of water required for a water-carrying Teilspülgang. Heat transfer module according to one of claims 2 to 4, characterized in that the volume of the primary chamber ( 17 ) and / or the secondary chamber ( 18 ) in each case between 0.5 liters and 8 liters, preferably between 1.0 liter and 6 liters, more preferably between 2 liters and 4 liters. Heat transfer module according to one of the preceding claims, characterized in that the heat exchanger ( 16 ) as a countercurrent heat exchanger ( 16 ) is trained. Heat transfer module according to one of the preceding claims, characterized in that the heat transfer device ( 16 ) a heat storage ( 45 ). Heat transfer module according to one of the preceding claims, characterized in that the heat accumulator ( 45 ) is designed as a solid heat storage. Heat transfer module according to one of the preceding claims, characterized in that the heat accumulator ( 45 ) is designed as latent heat storage. Dishwasher, in particular domestic dishwasher ( 1 ), with at least one water inlet device ( 7 . 8th . 9 ) for receiving feed water (ZW) from an external water supply (WH) and with at least one water drain device ( 11 . 12 . 13 ) for the discharge of wastewater (AW) to an external wastewater disposal (A), characterized in that it is suitable for coupling in a heat transfer module ( 2 ) according to at least one of claims 1 to 9 in the water inlet device ( 7 . 8th , 9 ) and into the water drainage device ( 11 . 12 . 13 ) is prepared. Dishwasher according to claim 10, characterized in that the water inlet device ( 7 . 8th . 9 ) with an input-side coupling piece ( 23 ) a secondary chamber ( 18 ) of the heat transfer module ( 2 ) corresponding coupling piece ( 24 ) and / or one with an output-side coupling piece ( 25 ) of the secondary chamber ( 18 ) corresponding coupling piece ( 26 ), and / or that the water drainage device ( 11 . 12 . 13 ) with an input-side coupling piece ( 19 ) a primary chamber ( 17 ) of the heat transfer module ( 2 ) corresponding coupling piece ( 21 ) and / or one with the output side coupling piece ( 20 ) of the primary chamber ( 17 ) corresponding coupling piece ( 22 ) having. Dishwasher according to claim 10 or 11, characterized in that a control device ( 14 ) is provided for controlling rinses for cleaning dishes, which has a first mode and a second mode for performing rinses, wherein the first mode for operation without coupled heat transfer module ( 2 ), and wherein the second operating mode for operation with coupled heat transfer module ( 2 ) is provided. Dishwasher according to claim 12, characterized in that in the second mode at least one control parameter of the rinse cycle is changed in comparison to the first mode. Dishwasher according to one of claims 10 to 13, characterized in that it is designed for simultaneous intake of feed water (ZW) and discharge of wastewater (AW). Arrangement with a dishwasher ( 1 ), in particular with a domestic dishwasher ( 1 ), and with a heat transfer module ( 2 ) for the use of heat energy from waste water (AW) of the dishwasher ( 1 ), characterized in that the dishwasher ( 1 ) according to at least one of claims 10 to 14 and / or the heat transfer module ( 2 ) is formed according to at least one of claims 1 to 9.

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