EP2440108A1

EP2440108A1 - Dishwasher having two water connections and corresponding control method

Info

Publication number: EP2440108A1
Application number: EP10720441A
Authority: EP
Inventors: Roland Rieger; Michael Rosenbauer
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2009-06-10
Filing date: 2010-06-01
Publication date: 2012-04-18
Also published as: DE102009026887A1; US20120073606A1; WO2010142557A1; US9326656B2

Abstract

The invention relates to a dishwasher, especially a domestic dishwasher (1), comprising a water inlet device (5) having a hot water inlet (6, 7) and a cold water inlet (8, 9), the hot water inlet (6, 7) being adapted to receive hot water from an external hot water supply (WH) and the cold water inlet (8, 9) being adapted to receive cold water from an external cold water supply (KH). The dishwasher further comprises a program control device (19) in which at least one wash program (SP) for controlling a wash cycle for cleaning dishes is stored. The hot water inlet (6, 7) is adapted to receive hot water from an external hot water supply (WH) which is at least partially fed especially by a thermal solar system (TSA). The at least one wash program (SP) has at least one program step (RS, KS) for washing dishes using hot water from the hot water supply and one program step (VS, ZS) for washing dishes using cold water from the cold water supply.

Description

Dishwasher with two water connections and associated control method

The present invention relates to a dishwasher, in particular a domestic dishwasher, with a water inlet device having a hot water inlet and a cold water inlet, wherein the hot water inlet for receiving hot water from an external hot water supply and the cold water inlet for receiving cold water from an external cold water supply is provided, and a sequence control device, in which at least one rinse program for controlling a rinse cycle for cleaning items to be stored is stored.

From DE 100 46 347 A1 a dishwasher with a water supply device is known, which comprises a cold water valve and a hot water valve. Both the cold water valve and the hot water valve can be opened or closed by means of a control device in dependence on an operating program. In this way, the hot water required by the dishwasher can be taken from a hot water supply line whose water is heated by a household heating system.

There is no question that the use of hot water from a domestic heating system can lead to a saving in electrical energy, since in this case the energy requirement of an electric radiator of the dishwasher can be reduced. Against the background of generally increased operating costs of household heating systems, the additional costs for the operation of the domestic heating system caused by the removal of hot water from the domestic hot water supply line in many cases exceed the saved costs for electricity.

The object of the present invention is to provide a dishwasher which causes lower energy costs during operation. The object is achieved in a dishwasher of the type mentioned above in that the hot water supply for receiving hot water from an external hot water supply, which is at least partially fed in particular by a solar thermal system is provided, wherein the at least one washing program at least one program step for rinsing Washware using hot water from the hot water supply and a program step for washing items to be washed using cold water from the cold water supply provides.

Through this bithermic water connection with a controllable hot water connection and at the same time a controllable cold water connection, the total energy expenditure for operating the dishwasher can be reduced. At the same time, this bithermic water connection allows improved flexibility in the rinse program guidance of the respective selected dishwasher program of the dishwasher according to the invention. For each program step of the selected dishwasher program, the feed of hot water alone, cold water alone, or any mixture of hot water and cold water can be selected.

In the case of the bithermal water connection device according to the invention, according to an advantageous development of the invention, both a supply of controllable hot water connection with respect to the inlet, in particular by means of a valve, and at the same time a controllable cold water connection with respect to the inlet, in particular by means of a valve, whereby a flexible Spülprogrammführung is made possible free choice of inflow of hot water or cold water or mixing of hot water and cold water as required. Thus, for example, a hot water inlet during the rinsing step of a selected Geschirrspülprogramms after completion of the rinse step on the cold water inlet in particular to prepare the final drying step of the selected Geschirrspülprogramms be changed to a reservoir provided on the side wall of the washing of this dishwasher as a heat exchanger for generating a condensation surface is to fill with cold water. In contrast, on the other hand, in a dishwasher for which only a hot water connection alone is provided, in particular the disadvantage that a storage container which is provided on the side wall of the washing container of this dishwasher as a heat exchanger for generating a condensation surface, can no longer cause the desired condensation effect by filling with hot water during the drying step of a selected Geschirrspülprogramms, as in a filling with cold water would be the case. So there would be a loss of drying power.

Furthermore, the bithermal water connection according to the invention advantageously allows, e.g. to change from the hot water connection to the cold water connection or switch, in particular to be able to perform a regeneration step and / or rinsing step for the ion exchanger of the dishwasher according to the invention with cold water. This allows hot water from the hot water supply and thus save energy.

The term "controllable" also includes in the context of the invention that the inlet from the hot water connection and the cold water connection can be regulated by means of valves, in particular Aquastop valves Run each outlet control device of the dishwasher in an open state and a closed state.

A thermal solar system is a technical system for converting solar energy into usable thermal energy. This thermal solar systems usually provide hot water in a temperature range of, for example, 40 ⁰ C to 70 ⁰ C ready, which makes a direct use of hot water for heating buildings but also as service water possible. Thermal solar systems typically include a plurality of solar collectors having an absorber surface that is heated by the electromagnetic solar radiation. From there, the heat can be transported by means of a fluid to a heat exchanger that generates the hot water.

In favorable conditions, even in temperate climates, even with collector areas of a few square meters, the domestic hot water requirement of a household can be be covered. The production costs for the recovered heat energy are extremely low. However, in many places, for example in Central Europe, in the winter months, in summer bad weather periods or in a high hot water demand, the performance of the solar panels is not sufficient. Solar systems therefore have in many cases a conventional additional heating, for example, a gas or oil heating in order to have sufficient hot water available even in such a situation. However, if it is necessary to resort to the additional heating, as a rule, the production costs for the provided hot water increase.

An inexpensive hot water supply can, in addition to or in addition to a solar system in the home, if necessary, by a modern condensing boiler such. Pellet stove, wood chip or wood heating, a cogeneration plant, geothermal heat pump, air heat pump system, a district heating system or a local heating system, individually or in any combination, etc

Will be provided. In particular, e.g. the combination of a pellet stove with a solar thermal system to be energetically advantageous.

The dishwasher according to the invention allows the efficient use of cost by means of a hot water supply system, in particular solar system, produced hot water. For this purpose, at least one rinsing program is provided, which provides at least one program step for rinsing items to be washed using hot water from the hot water supply system and a program step for rinsing items to be washed using cold water from the cold water supply system. In this way, it can be ensured that the amount of hot water withdrawn from the hot water supply system, in particular the solar system, during the execution of a rinse cycle is limited to a minimum extent. Thus, in situations where the domestic hot water demand from the currently existing hot water supply system can not be fully covered, especially not solar thermal, the cost of additional heating for the hot water supply system can be reduced. In this way it is ensured that the saving of electrical energy for the operation of an electric heater of the dishwasher and the additional effort to provide a sufficient amount of hot water stand in a favorable ratio by means of external auxiliary heating. Thus, a dishwasher according to the invention can be operated more efficiently than a dishwasher which uses exclusively supplied hot water or exclusively supplied cold water for loading the items to be washed.

According to a preferred embodiment of the invention, the wash program provides a cleaning step for washing items to be washed, in which a loading of items to be washed with hot water from the hot water supply. A cleaning step is used to thoroughly clean the dishes. For this purpose, it is necessary to apply water to the wash ware, which has a comparatively high temperature in order to achieve a high thermal cleaning effect. In addition, water is generally added to the detergent whose chemical cleaning action is best at a higher temperature. Usually, therefore, a temperature of about 50 ⁰ C to 70 ⁰ C is provided for a cleaning step. When using hot water, for example, from the solar system for the cleaning step so it is ensured that the solar energy extracted heat energy is used meaningfully. In this case, a high saving in electrical energy can be achieved here, since the hot water from the solar system in many cases not at all, in other cases only to a small extent, must be reheated by the electric heater of the dishwasher to reach the required temperature.

According to an advantageous embodiment of the invention, the rinse program provides a rinse step for rinsing items to be washed, in which a loading of items to be washed with hot water from the hot water supply. A rinse step serves in particular to avoid stains on the dishes, which could be caused by dissolved substances in the water, such as salt and / or lime. For this purpose, the water is added during the rinse step with rinse aid. Another object of the rinse step is to prepare a subsequent drying step. Thus, during the rinse step, the dishes are heated by using particularly hot water, which for example has a temperature of 60 ° C to 75 ° C is used. In the final drying step, water droplets adhering to the hot dishes evaporate and beat against the inside of the washing container due to the lower level prevailing there Temperature off. When using hot water, for example, from the solar system for the rinse step so also ensures that the solar energy extracted heat energy is used meaningfully. Again, a high saving of electrical energy can be achieved because the hot water from the solar system in many cases not at all, in other cases only to a small extent, must be reheated by the electric heater of the dishwasher to the required for the final rinse step temperature to reach.

According to a preferred development of the invention, the rinsing program provides a pre-rinsing step for rinsing items to be washed in which, in preparation for a cleaning step, items to be washed with cold water are supplied from the cold-water supply. The pre-rinsing step serves to remove coarse contaminants from the dishes to prepare a cleaning step. The detachment of this coarser dirt essentially takes place mechanically, so that cleaning agents as well as high temperatures during the pre-rinsing step can be dispensed with in many cases. Therefore, cold water from the cold water supply can be used without problems, without this having to be heated with higher electrical energy input. At the same time, the amount of heat extracted from the hot water supply can be reduced without significantly worsening the cleaning result.

According to an advantageous development of the invention, the rinsing program provides an intermediate rinsing step for rinsing items to be washed, in which, for removing detergent from the items to be washed, a loading of items to be washed with cold water from the cold water supply takes place after a cleaning step. An intermediate rinsing step serves in particular for the removal of detergent residues which adhere to the items to be washed after a cleaning step. As a rule, no higher temperatures are required for this, so that cold water from the cold water supply can be used without problems even in the intermediate rinsing step, without this having to be heated under higher electrical energy input. At the same time, the amount of heat extracted from the hot water supply can be further reduced without the cleaning result being impaired. According to a preferred development of the invention, it is provided that the hot water inlet comprises a hot water valve and the cold water inlet comprises a cold water valve, wherein the hot water valve and the cold water valve are independently controllable by the sequence control device. This makes it possible in a simple manner to carry out the intended by the wash program recording hot water from the hot water supply and provided by the wash program recording of cold water from the cold water supply. In particular, can be dispensed with an external device for controlling the water absorption.

According to an expedient development of the invention, it is provided that the hot water valve is arranged at an upstream end of a hot water hose and adapted to be fastened to a fitting of the external hot water supply, and / or that the cold water valve is arranged at an upstream end of a cold water hose and so is formed so that it is attachable to a connector of the external cold water supply. The hot water valve and / or the cold water valve can for this purpose have connection threads, for example, which correspond with threads of household faucets. Such valves are also known as Aquastop valves.

The arrangement of the hot water valve and / or the cold water valve at the upstream end of the water inlet device has the advantage that practically no leakage water can escape from the dishwasher even in the event of damage as long as the valves are closed. If the valves are designed to close when not energized, leaking of leakage water from a switched-off dishwasher is prevented in virtually all cases. In order also to prevent leakage of leakage water from a switched-on dishwasher, the flow control device may be associated with a leak water sensor for detecting leakage water, so that the flow control device can close the valves when leak water occurs during operation of the dishwasher. According to a preferred embodiment of the invention, it is provided that a downstream end of the hot water hose and a downstream end of the cold water hose are connected via a connecting piece liquid-conducting with a supply hose, which is connected to a housing-fixed connection piece of the dishwasher. Such a design of the water inlet device is structurally simple and significantly shortens the hose length required in many cases, especially if the connection points of the external hot water supply and the external cold water supply are further removed from the installation of the dishwasher, since in this case dispensed two longer parallel tubes can.

In particular, the connector, in particular Y-connector, according to a first advantageous embodiment variant outside the dishwasher freely attached to the hot water hose and the cold water hose provided via an external inlet hose to the device-side water inlet device of the dishwasher. This can e.g. then be useful if the connector is only subsequently mounted on the dishwasher as an additional component.

According to a second advantageous embodiment, however, it may be particularly expedient that the connecting piece, in particular Y-connector, on the device side water inlet device of the dishwasher on the device side, in particular device inside, is attached. Characterized in that the water inlet device of the dishwasher according to the invention, in particular domestic dishwasher, on the device side especially with a connector, preferably Y-connector, equippable, preferably already factory-prepared, the connection of the dishwasher to an external hot water supply and to an external cold water supply for an operator facilitates or simplifies. Because it is not necessary to obstruct the connector as a loose, bulky component outside the dishwasher in the external space between the external hot water supply, the external cold water supply and the dishwasher by means of three long water hoses. Since the connector is directly attachable to the water inlet device of the dishwasher, a outwardly guided, ie long led out of the housing of the dishwasher water supply hose between the water inlet device of the dishwasher and the connecting piece accounts. The connector is thus preferably provided as a device-side equipment component. In particular, it can form an installation component in the dishwasher or an attachment to the dishwasher. By the device-side attachment of the connector, this mechanically safe, that can be reliably connected to the water inlet device. Unacceptable stresses, especially unacceptably high tensile loads on the connector, as well as other unacceptable damage to the connector are largely avoided in this way, which in contrast with a free, "overhead-down" suspension of the connector to the water connections, especially faucets of the external In particular, two external water supply hoses for connecting the hot water supply line section of the connection piece to the external hot water supply and the cold water supply line section of the connection piece, in particular the Y connection piece, advantageously suffice for the external cold water supply, ie two connection processes are sufficient simplifies the assembly for an operator or a fitter, in particular, unacceptably high tensile loads or other impermissibly large mechan European requirements of these water inlet hoses and the water connections, especially taps of the external hot water supply and the external cold water supply to which the water inlet hoses are coupled upstream, largely avoided, which in contrast can occur in the case of a freely suspended connector by its own weight becoming effective. Furthermore, the storage and the packaging of the dishwasher is simplified by eliminating the connector as loose, external extra component. In addition, a device-side attachment of the connector ensures a kind of standardization, in particular standardization of the assembly or production, warehousing and packaging of such trained dishwashers. The dishwasher according to the invention with the externally or device-side mounted connector, in particular Y-connector, is thus prepared so that they each depending on the existing water connection conditions an external hot water supply alone, an external cold water supply alone, or both an external hot water supply and an external cold water supply at the same time, can be connected.

The invention also relates to a method for controlling at least one rinse cycle of a dishwasher, in particular domestic dishwasher, by means of at least one rinse program a flow control device, the dishwasher a water inlet device with a hot water inlet for receiving hot water from an external hot water supply and a cold water inlet for receiving cold water from an external Has at least one program step using hot water from the external hot water supply, which is at least partially fed in particular by a solar thermal system, and at least one program step using cold water from the external cold water supply.

Other developments of the invention are given in the dependent claims.

The invention and its developments are explained in more detail with reference to drawings. Show it:

Figure 1 is a schematic spatial representation of an embodiment of a dishwasher according to the invention;

Figure 2 is a block diagram of the dishwasher according to the invention of Figure 1;

FIG. 3 shows a functional diagram for explaining the function of the dishwasher according to the invention of FIG. 1.

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

1 shows a schematic spatial representation of an embodiment of a dishwasher 1 according to the invention. This has a washing container 2, which can be closed by a door 3, so that a washing cell for washing dishes is formed. The rinsing container 2 is arranged in the interior of a housing 4 of the dishwasher 1, which may have standard dimensions. For example, the housing 4 may have a width of 45 cm or 60 cm, which enables integration of the dishwasher 1 into a standard kitchen unit with a corresponding installation niche.

On the back of the dishwasher 1, a schematically illustrated water inlet device 5 is arranged. This has a hot water inlet 6, 7 and a cold water inlet 8, 9, wherein the hot water inlet 6, 7 for receiving hot water from an external hot water supply WH and the cold water inlet 8, 9 is provided for receiving cold water from an external cold water supply KH.

Here, the hot water inlet 6, 7 include a controllable hot water valve 6 and the cold water inlet 8, 9 a controllable cold water valve 8. The hot water valve 6 and cold water valve 8 are basically constructed identically. For example, both valves 6, 8 may be formed as a solenoid valve. The inlet sides of the valves 6, 8 are each designed so that they can be attached to fittings WH, KH of a household water supply, for example, to faucets WH, KH, can be attached. The connection can be made in each case by means of a screw connection, a snap connection or the like. Such valves 6, 8 are also known under the name Aquastop valve 6, 8. Advantageously, these are closed when they are not activated, so that the dishwasher 1 is disconnected from the water supply in the off state. In this way, leakage of leakage water from the switched-off dishwasher 1 can be avoided in the event of a fault. 1, the inlet side of the hot water valve 6 is connected to a hot water tap WH and the inlet side of the cold water valve 8 to a cold water tap KH. The output side of the hot water valve 6 is connected to a hot water hose 7 and the output side of the cold water valve 8 with a cold water hose 9, wherein the downstream ends of the hot water hose 7 and the cold water hose 9 are connected to an input side of a connecting piece 10. This is designed in particular as a Y-branch. At its output side, a common inlet hose 11 connects for hot water and cold water, which in turn is connected to a connector 12 on the housing 4 of the dishwasher 1. By means of the water inlet device 5, it is consequently possible to individually direct hot water from an external hot water supply WH and / or cold water from an external cold water supply KH into the interior of the dishwasher 1.

The hot water hose 7, the cold water hose 9 and / or the common inlet hose 1 1 may be formed as safety hoses with an inner water-carrying pressure hose and an outer Hüllschlauch, wherein between the pressure hose and Hüllschlauch each a leakage water channel can be provided for discharging any leak water occurring. In this case, the connecting piece 10 may be formed so that the leakage water channels of the hot water hose 7, the cold water hose 9 and the common inlet hose 11 are interconnected, so that leakage water, which occurs during operation of the dishwasher 1 in the water supply device 5, on the housing-fixed connector 12 is passed into the interior of the dishwasher 1. Here it can be detected by a leak water sensor, not shown, so that appropriate measures, such as closing the hot water valve 6 and cold water valve 8, can be initiated.

As an alternative to this external arrangement of, in particular Y-branch, connector 10 outside the dishwasher, it may be advantageous if the connector on the device side, in particular device internally, on the device side connector, in particular without external inlet hose, fixedly coupled or at this with is formed. This can especially already be prepared from the outset in the factory. In this embodiment variant, the common inlet hose can possibly be saved. In particular, the connection piece 12 may be provided together with the Y-connector in the region of the base assembly on or in this.

Downstream of the housing-fixed connection piece 12, a free flow path 13 is provided. In the free flow path 13 is a so-called pipe interruption, which serves to prevent a sucking back of water from the dishwasher 1, if in the external water supply by dynamic processes, a negative pressure. This prevents in particular that already used water, which may be mixed with dirt, cleaning agents and / or cleaning agents, gets back into the building water supply.

The dishwasher 1 also has components not shown in FIG. 1, which make it possible to direct hot water and / or cold water from the outlet of the free flow path 13 into the washing container 2.

In a lower region of the washing container 2, a pump pot 16 is provided, in which a circulating pump is suitably provided for circulating water in the washing container 2 during a rinse cycle. In this case, the circulation pump may have a heating device for heating the water located in the washing container 2, for example a water heater. Likewise, in the sump 16, a pump for pumping out water, for example at the end of a rinse cycle, be provided. However, the various pumping functions can also be perceived by a single pump in conjunction with switchable valves. The sump 16 is usually connected to a waste water connection piece 17 via means not shown so that water from the washing compartment 2 via a connected to the wastewater connection piece 17 sewage hose 18 in a building side installed wastewater A, such as a sewer pipe A, can be pumped.

The dishwasher 1 also has a flow control device 19 for controlling the course of a washing program. In the flow control device 19 Various washing programs can be stored, which can be selected by an operator. The flow control device 19 is arranged inside the door 3 of the washing container 2, but could also be arranged elsewhere in the dishwasher 1.

In Figure 1, the hot water inlet 6, 7 of the dishwasher 1 is intended to an external hot water supply WH, which is powered by a solar thermal system TSA with hot water, connected. The thermal solar system TSA comprises a large number of solar collectors SOK, of which only one is shown for reasons of space. The solar collectors SOK each have an absorber surface, not shown, which can be heated by the electromagnetic solar radiation. From there, the heat can be transported by means of a fluid to a heat exchanger WT, which generates the hot water for the hot water supply WH.

In order to be able to provide sufficient hot water in situations in which the heat energy provided by the solar panels is insufficient, the solar system has a conventional auxiliary heating ZH, for example a gas or oil heater, which can also supply heat to the heat exchanger WT.

Figure 2 shows a functional diagram of the dishwasher of Figure 1. The hot water valve 6 and the cold water valve 8 are each connected to the flow control device 19, that both are individually controlled. This makes it possible to feed the washing container 2 of the dishwasher 1 via the connecting piece 10, the free flow path 13 and a drain 21 specifically with hot water and / or cold water.

In the sump 16 of the washing container 2, a heating pump 22 designed as a circulation pump 22 is arranged, which is in communication with a arranged in the interior of the washing container 2 spray system 23. This makes it possible to apply in the washing container 2 arranged items to be washed during a wash with water to clean this. Furthermore, a drain pump 22 is arranged in the sump, which allows no longer needed water to the outside pump out. In the case of the heating pump 22, both the heating function and the pumping function can be individually controlled by the sequence control device 19. Furthermore, the flow control device 19 is also connected to the drain pump 24 for the control thereof.

The feeding of the dishwasher 1 with water, as well as the control of the heating pump 22 and the drain pump 24 and other not explained here devices of the dishwasher 1 in response to a wash program, which is stored in the flow control device 19. In the case of a dishwasher 1 according to the invention, at least one washing program is provided which can be selected specifically for the efficient use of solar-heated water.

FIG. 3 shows a functional diagram for explaining the function of the dishwasher 1 according to the invention of FIGS. 1 and 2. For this purpose, the sequence of a washing program SP is shown, which is intended to control a course of a washing cycle when the hot water inlet device 6, 7 of the dishwasher 1 has Hot water from a solar thermal system TSA is supplied.

FIG. 3 shows on a common time axis t the curves SWV, SKV, BAP and BSB which indicate switching or operating states of components of the dishwasher 1 on the vertical axis Z.

The curve SWV represents the switching state of the hot water valve 6 of the dishwasher 1. Furthermore, the curve SKV shows the switching state of the cold water valve 8 of the dishwasher 1. The switching state "0" corresponds in each case a closed valve 6, 8, the switching state "1" an open Valve 6, 8. The curve BAP continues to represent the operating state of the sewage pump 24, wherein the off state is symbolized by "0" and the on state by "1". Finally, the curve BSB shows the charging state of the washing container 2 with water. This is a loaded with hot water from the hot water supply WH washing 2 with "WW", one with cold water from the cold water supply KH charged washing container 2 with "KW" and an empty washing container 2 represented by "0".

FIG. 3 shows by way of example a rinsing program SP, which in this sequence comprises a pre-rinsing step VS, a cleaning step RS, an intermediate rinsing step ZS, a rinsing step KS and a drying step TS. In other examples, one or more of these steps might be hidden. Also examples would be possible in which one or more steps are repeated several times.

The first pre-rinsing step VS serves to remove coarse contaminants from the dishes so as to prepare the cleaning step RS. For this purpose, the cold water valve 8 is opened at the beginning of Vorspülschritts VS until the washing container 2 is charged with a sufficient amount of cold water from the cold water supply KH. This cold water is circulated by means of the heat pump 22 for a predetermined time, usually without switching on their heating, so as to pressurize the dishes with cold water. Thereafter, the now contaminated cold water is pumped out by means of the drain pump 24 to the outside.

The use of cold water from the cold water supply KH during the pre-rinse step VS is possible without any problems since the removal of the coarser dirt essentially takes place mechanically, so that high temperatures during the pre-rinse step can be dispensed with in many cases. Thus, a reheating by means of the heating pump 22 can be omitted or carried out with a low electrical energy input. At the same time, the amount of heat removed from the hot water supply WH can thus be reduced, without the cleaning result being appreciably worsened.

The subsequent cleaning step RS is used to thoroughly clean the dishes. For this purpose, the hot water valve 8 is opened at the beginning of the cleaning step RS until the washing container 2 is charged with a sufficient amount of hot water from the hot water supply WH. The filled in the washing tank 2 hot water is now using the heat pump 22 for circulated a predetermined time so as to pressurize the dishes with hot water. In this case, the heating device of the heating pump 22 can be switched on as required as a function of the temperature of the supplied hot water and in dependence on the intended washing temperature of the cleaning step RS. At the conclusion of the cleaning step RS, the now polluted hot water is pumped out by means of the drain pump 24 to the outside.

During the cleaning step RS, it is usually necessary to apply water to the wash ware, which has a comparatively high temperature in order to achieve a high thermal cleaning effect. In addition, water is generally added to the detergent whose chemical cleaning action is best at a higher temperature. Usually, therefore, a temperature of about 50 ⁰ C to 70 ⁰ C is provided for a cleaning step RS. When using hot water from the thermal solar system TSA for the cleaning step RS so it is ensured that the extracted solar energy TSA heat energy is used meaningfully. Here, a high saving of electrical energy can be achieved, since the hot water from the solar thermal system TSA in many cases not at all, in other cases only to a small extent, must be reheated by the electric heating pump 22 of the dishwasher 1 to the required Reach temperature.

The now performed intermediate rinse step ZS for removing detergent from the items to be washed after the cleaning step RS also provides a loading of the washing container 2 with cold water from the cold water supply KH before to be able to apply the wash ware with cold water. For this purpose, first the cold water valve 8 is opened until the washing container 2 is charged with a sufficient amount of cold water for the intermediate rinsing step ZS. This cold water is circulated by means of the heat pump 22 for a predetermined time, which as a rule can be omitted connecting their heating device. Thereafter, the now contaminated cold water is pumped out by means of the drain pump 24 to the outside.

During the Zwischenspülschritts ZS are usually no higher temperatures required, so that even in the intermediate rinse ZS cold water from the Cold water supply can be used without this would have to be heated by means of the heating pump 22 with higher electrical energy input. At the same time, the amount of heat removed from the hot water supply WH can be further reduced without the cleaning result being impaired.

In the rinse step KS now following, a loading of items to be washed with hot water from the hot water supply is provided. For this purpose, the hot water valve 8 is first opened again until the washing container 2 is charged with a sufficient amount of hot water from the hot water supply WH for the final rinse step KS. The filled in the washing tank 2 hot water is now circulated by means of the heat pump 22 for a predetermined time, so as to pressurize the dishes with hot water. Also during the rinsing step KS, the heating device of the heating pump 22 can be switched on as required in dependence on the temperature of the hot water supplied and in dependence on its intended rinsing temperature. At the end of the final rinse step KS, the now polluted hot water is pumped out by means of the drain pump 24 to the outside.

A rinse step KS is used in particular to avoid stains on the dishes, which could be caused by dissolved substances in the water, such as salt and / or lime. For this purpose, the water is added during the rinse step KS with rinse aid. Another object of the rinsing step KS is to prepare a subsequent drying step TS. Thus, the dishes are heated by hot water in particular, comprising, for example, a temperature of 60 ⁰ C to 75 ° C, is used during the rinsing step KS. As a result, water droplets adhering to the hot dishes evaporate in the subsequent drying step TS and precipitate on the inside of the washing container 2 due to the lower temperature prevailing there. When using hot water from the solar system TSA for the rinse step KS is therefore also ensured that the solar energy TSA extracted heat energy is used meaningfully. Again, a high saving in electrical energy can be achieved because the hot water from the solar system TSA in many cases not at all, in other cases only to a small extent, by the electric heating direction 22 of the dishwasher 1 must be reheated to achieve the required for the final rinse step KS temperature.

During the final drying step TS, a feeding of the washing container 2 with water is not provided.

In one embodiment of a dishwasher according to the invention, two water connections are provided which can be controlled separately with one Aquastop valve each. One water connection is provided for warm inexpensive solar water, the other water connection for cold water from the mains. Both water connections can be individually selected via a control of the dishwasher. After the two valves, the water then flows through a Y-piece in a hose to a dishwashing system of the dishwasher. It is thus provided a bi-thermal water connection.

The dishwasher can now use warm water from the hot water solar system and / or cold water from the mains individually.

Advantages result from the partial use of economically heated solar water and the saving of energy, which is possible through targeted use of different types of water in the respective program sections. In this way, the predetermined performance data (rinsing and drying performance) of the dishwasher can be efficiently achieved.

Generally speaking, the sequence control device of the dishwasher has a first operating mode in which at least one rinsing program can be called, which provides for the use of hot water from the external hot water supply in at least one rinsing program step, a second operating mode in which at least one rinsing program can be called, which at least one Rinsing program step exclusively provides a use of cold water from the external cold water supply, and / or a third mode in which at least one wash program can be called, which in at least one Spülprogrammschritt the mixing of hot water from the external hot water supply with cold water from the external cold water supply provides on.

For this purpose, in particular the connecting piece, preferably Y-connector is provided. In particular, it may be fixed to the device, preferably provided internally or externally, i. be provided outside the dishwasher. The respective inlet of the hot water and / or cold water can be controlled in each case by means of a controllable valve in the two inlet-side feeder branches of the Y-connector or in the inlet hoses connected to this inlet side using the flow control device. In this way, a bi-thermal water connection is provided by the connector.

Instead of the Y-connector, another shaped connecting piece may be expedient, which also allows a branching of two separate water outlets, in particular from a hot water inlet and from a cold water inlet, to a common outlet piece.

In particular, it may be appropriate, instead of or in addition to the solar thermal system for providing a cost domestic hot water supply a modern condensing boiler such as a Pelletofen-, wood chips, or Holzscheitheizung, a combined heat and power plant, geothermal heat pump, air heat pump system, a district heating system or a local heating system, individually or in any combination, etc to use. In particular, the combination of, for example, a pellet stove with a thermal solar system can be energetically advantageous. In particular, other hot water supply systems, which manage without or only with relatively low primary energy demand from fossil fuel carriers, are particularly favorable in terms of energy and / or use only largely CO ₂ -neutral energy carriers. The explanations given in the case of a solar thermal hot water generation system apply in the presence or presence of another hot water supply system with regard to the Training and control of the dishwasher according to the invention in an analogous manner.

LIST OF REFERENCE NUMBERS

1 dishwasher

2 rinse tanks

3 door

4 housing

5 water inlet device

6 hot water valve

7 hot water hose

8 cold water valve

9 cold water hose

10 connector

1 1 inlet hose

12 housing-fixed connection piece

13 free flow path

16 pump pot

17 wastewater connection piece

18 sewage hose

19 flow control device

21 process

22 Circulation pump with instantaneous water heater

23 spraying device

24 drain pump, sewage pump

A sewage pipe

KH cold water supply, cold water tap

WH hot water supply, hot water tap

TSA thermal solar system

SOK solar panel

WT heat exchanger

ZH additional heating

SWV Switching state of the hot water valve SKV Switching state of the cold water valve BAP Operating status of waste water pump

BOD filling status of the washing container

SP wash program

VS pre-rinse step

RS cleaning step

ZS intermediate rinse step

KS rinse step

TS drying step

Claims

claims

1. Dishwasher, in particular domestic dishwasher (1), with a water inlet device (5), which has a hot water inlet (6, 7) and a cold water inlet (8, 9), wherein the hot water inlet (6, 7) for receiving hot water from an external Hot water supply (WH) and the cold water inlet (8, 9) for receiving cold water from an external cold water supply (KH) is provided, and with a flow control device (19), wherein the at least one wash program (SP) for controlling a wash cycle for cleaning items to be washed is deposited, characterized in that the hot water inlet (6, 7) for receiving hot water from an external hot water supply (WH), which is at least partially fed in particular by a solar thermal system (TSA) is provided, wherein the at least one washing program (SP ) at least one program step (RS, KS) for rinsing items to be washed using hot water from the hot water supply and a program step (VS, ZS) for rinsing dishes using cold water from the cold water supply (KH) provides.

2. Dishwasher according to the preceding claim, characterized in that the wash program (SP) provides a cleaning step (RS) for rinsing items to be washed, in which a loading of items to be washed with hot water from the hot water supply (WH).

3. Dishwasher according to one of the preceding claims, characterized in that the rinse program (SP) provides a rinse step (KS) for rinsing items to be washed in which a loading of items to be washed with hot water from the hot water supply (WH).

4. Dishwasher according to one of the preceding claims, characterized in that the rinsing program (SP) provides a pre-rinsing step (VS) for rinsing items to be washed, in the preparation of a cleaning Steps (RS), a loading of wash ware with cold water from the cold water supply (KH) takes place.

5. Dishwasher according to one of the preceding claims, characterized in that the wash program (SP) provides a Zwischenspülschritt (ZS) for rinsing items to be washed in the removal of detergent from the items to be washed after a cleaning step (RS) an application of items to be washed with cold water the cold water supply (KH) takes place.

6. Dishwasher according to one of the preceding claims, characterized in that the hot water inlet (6, 7) comprises a hot water valve (6) and the cold water inlet (8, 9) comprises a cold water valve (8), wherein the hot water valve (6) and the cold water valve ( 8) are independently controllable by the flow control device (19).

7. Dishwasher according to one of the preceding claims, characterized in that the hot water valve (6) at an upstream end of a hot water hose (7) is arranged and adapted to be attached to a fitting (WH) of the external hot water supply (WH), and / or that the cold water valve (8) is arranged at an upstream end of a cold water hose (9) and adapted to be fastened to a connection piece (KH) of the external cold water supply (KH).

8. Dishwasher according to claim 7, characterized in that the downstream end of the hot water hose (7) and the downstream end of the cold water hose (9) with a connecting piece (10), in particular Y-connector, are liquid-conductively connected.

9. Dishwasher according to claim 8, characterized in that the connecting piece (10) outside the dishwasher (1) is provided free-hanging on the hot water hose (7) and the cold water hose (9), and that the connecting piece (5), in particular Y-connector . is connected via an external inlet hose (1 1) with the device-side water inlet device (13) of the dishwasher (1).

10. Dishwasher according to claim 8, characterized in that the connecting piece (10) on the device-side water inlet device (13) on the device side, in particular device inside, is attached.

1 1. Dishwasher according to claim 10, characterized in that the connecting piece (5) on the washing compartment (2) of the dishwasher (1) or on or in the bottom module (BG) of the dishwasher (1), in particular stationary, is provided.

12. A method for controlling at least one wash cycle of a dishwasher (1), in particular domestic dishwasher, by means of at least one wash program (SP) of a flow control device (19), wherein the dishwasher (1) a water inlet device (5) with a hot water inlet (6, 7) for Including hot water from an external hot water supply (WH) and a cold water inlet (8, 9) for receiving cold water from an external cold water supply (KH), in particular according to at least one of the preceding claims, characterized in that at least one rinsing program (SP) for rinsing items to be washed at least one program step (RS, KS) using hot water from the external hot water supply (WH), which is at least partially fed in particular by a solar thermal system (TSA), and at least one program step (VS, ZS) using Cold water from the external cold water supply (KH) be performed.