WO2010142561A1

WO2010142561A1 - Dishwasher having two water connections and control method

Info

Publication number: WO2010142561A1
Application number: PCT/EP2010/057585
Authority: WO
Inventors: Roland Rieger; Michael Rosenbauer
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2009-06-10
Filing date: 2010-06-01
Publication date: 2010-12-16
Also published as: DE102009026911A1

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). A downstream end of the hot water inlet (6, 7) and a downstream end of the cold water inlet (8, 9) are connected to an inlet hose (11) via a connector (10) so as to carry liquids, said inlet hose being connected to a connecting piece (12) of the dishwasher (1), which connecting piece is fixed to the housing, and to a program control device (19) for controlling a wash program for cleaning dishes. 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 program control device (19) has a first operating mode in which at least one wash program (SP1) can be activated which provides for the use of hot water from the hot water supply (WH) for a wash cycle, and the program control device (19) has a second operating mode in which at least one wash program (SP2) can be activated which provides for the use of cold water from the cold water supply (KH) only for a wash cycle.

Description

Dishwasher with two water connections and control method

The present invention relates to a dishwasher, in particular a domestic dishwasher, with a water inlet device, which has 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 are provided, wherein a downstream end of the hot water inlet and a downstream end of the cold water inlet are connected via a connecting piece liquid-conducting with a supply hose which is connected to a housing-fixed connection piece of the dishwasher, and with a sequence control device for controlling a wash cycle for cleaning items to be washed.

In modern dishwashers, the items to be washed, in particular items to be washed, are introduced into a washing container and are there cleaned in a rinsing process, which is also called a rinse, with the aid of water and then dried. The aim is to perform a rinse so that a predefined cleaning result and a predefined drying result are achieved as efficiently as possible. Demanded is a high overall efficiency, which results from the cleaning efficiency and the drying efficiency. The cleaning efficiency corresponds to the ratio of the cleaning result achieved by means of a rinse cycle and the effort required for this purpose, wherein the effort can include several dimensions, for example the energy requirement, the water requirement and / or the time required. Furthermore, the drying efficiency corresponds to the ratio of the drying result achieved by means of a rinse cycle and the effort required for this purpose, wherein the effort here can also include several dimensions, for example the energy requirement and / or the time required.

In modern dishwashers usually one is provided in which one or more wash programs for controlling a wash cycle for cleaning Wash ware are stored. The sequence control device is designed such that it automatically controls a rinse cycle according to a rinse program usually selected by an operator. The water required for carrying out rinses can be taken up in known dishwashers via a water inlet device, which can receive water, for example, from a water supply installed on the building side.

A washing program has several successive program steps for the treatment of the items to be washed, wherein the water is provided in the water-conducting program steps depending on the respective program step with cleaning and / or additives and is brought to a favorable temperature for the respective program step. In order to be able to provide the water intended for rinsing with the intended cleaning and / or additives, modern dishwashers usually have automatic dosing devices. Furthermore, dishwashers can usually have an electric heater to bring the water intended for rinsing to the required temperatures.

A typical washing program comprises for cleaning the items to be washed in this order a pre-washing step, a cleaning step, an intermediate rinsing step and a rinsing step in which the items to be washed are each subjected to water. However, it is also possible to provide rinsing programs in which one or more of these program steps are hidden. Also, rinse programs are possible in which one or more of these program steps are repeated several times. Furthermore, a typical washing program includes an adjoining drying step for drying the cleaned items to be washed.

A pre-rinse step serves primarily to remove coarse contaminants from the items to be washed. The purpose of a subsequent cleaning step is to completely remove contaminants from the dishes. A now performed intermediate rinsing step serves in particular for the removal of detergent residues which adhere to the items to be washed. A subsequent rinsing step is in particular to avoid stains on the items to be washed, which could arise due to dissolved substances in the water, such as, for example, salt and / or lime. seen. For this purpose, the water is added during the rinse step with rinse aid.

In a dishwashing machine with a so-called self-drying, another object of the rinsing step is to prepare the subsequent drying step. The items to be washed are heated to a high temperature during the rinse step. In the subsequent drying step, water droplets adhering to the hot items evaporate and are deposited on the inside of the rinse container due to the lower temperature prevailing there.

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. Downstream of the cold water valve and downstream of the hot water valve, a water supply hose is arranged in each case, which opens into a branch. The single output of the branch is connected to a housing-fixed water inlet of the dishwasher. 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.

DE 100 57 263 mentions a hot water supply for a household appliance, which has solar panels for hot water.

There is no question that the use of hot water from a domestic heating system can lead to a saving of additional heat energy to be applied, 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 operating the household 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 in that the hot water inlet for receiving hot water from an external hot water supply, i. Hot water supply system, which is in particular at least partially powered by a solar thermal system, is provided, wherein the flow control device has a first mode in which at least one rinsing program can be called, which provides a hot water from the hot water supply in a rinse, and wherein the flow control device a second operating mode, in which at least one rinsing program can be called, which only provides a use of cold water from the cold water supply in a rinse cycle.

Suitably, the supply of external hot water supply can be partially or completely, in particular by a solar thermal system, as this alone with the primary energy of the sun (and not fossil fuels) a partial or complete contribution to the heating of water in the external hot water supply, especially CO ₂ - neutral, causes.

A cost-effective hot water supply can, in addition to or in addition to a solar system in the household possibly also by a modern condensing boiler such. Pellet stove, wood chip or wood log heating, 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. .... be made available. In particular, e.g. the combination of a pellet stove with a solar thermal system to be energetically advantageous.

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 panels having an absorber surface which 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, the hot water requirements of a household can already be covered with collector areas of a few square meters. 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.

The dishwasher according to the invention enables the efficient use of inexpensive, in particular by means of a solar system, generated hot water. For this purpose, the sequence control device has a first operating mode in which at least one rinsing program can be called, which provides for a rinse the use of hot water from the hot water supply, and wherein the flow control device has a second mode in which at least one rinsing program can be called, which at a Rinse only a use of cold water from the cold water supply provides. The first operating mode is therefore a hot water operation, in which for a rinse at least partially hot water from the, in particular solar thermal assisted, hot water supply system is used, while it is a pure cold water operation in the second mode, in which for a rinse exclusively Cold water from the cold water supply is used.

The first mode of operation allows efficient rinse cycles when the cost savings due to the reduction of the internal heating requirement of the dishwasher is greater than the additional cost of operating the hot water supply resulting from the removal of hot water. On the other hand For example, the second mode of operation allows efficient rinsing operations when the cost savings due to the reduction of the internal heating requirement of the dishwasher is lower than the additional cost of operating the hot water supply resulting from the removal of hot water.

In this case, it is possible, for example, to adapt the course of rinse cycles to the power generated by the solar collectors without requiring a change to the building-side installation or to the connection of the dishwasher to the building-side installation. In particular, it is not necessary to open or close faucets or valves installed on the building side. Also, it is not necessary to connect connecting hoses of the dishwasher with the building-side connections or to separate them.

If the solar panels provide a heat surplus in relation to the other requirements of the household, this excess heat can be used to reduce the internal energy requirement of the dishwasher in a simple manner by selecting the first operating mode. If, on the other hand, the solar collectors provide too little heat in relation to the heat demand of the household, it can be prevented by selection of the second operating mode that heat is withdrawn from the hot water supply, which would have to be compensated by heating with the usually more expensive additional heating.

With regard to their timing, the wash programs which can be called upon selection of the first operating mode are specially adapted to the use of hot water from the external hot water supply, which is supplied in particular by a thermal solar system. Likewise, the wash programs which can be called upon selection of the second operating mode are specially adapted to the use of cold water with regard to their chronological sequence. In both cases, such a predetermined cleaning effect or drying effect can be achieved with high efficiency.

In the first operating mode and in the second operating mode, corresponding rinsing programs can be provided, which are similar by a substantially identical cleaning action and / or drying effect. examples For example, corresponding Normalspülprogramme, corresponding intensive programs, corresponding Schonungen programs or corresponding automatic programs may be provided. The corresponding programs can alternatively or additionally be designed as quick-flushing programs.

According to an expedient development of the invention, at least one washing program can be called in the first operating mode, which provides at least one program step for washing items to be washed using hot water from the hot water supply.

If a program step by its nature requires or at least makes desirable the use of water at a high temperature, hot water may be taken from the external water supply for this program step in the first mode. Such a program step for rinsing items to be washed can be, in particular, a cleaning step and / or a rinsing step, since it is generally provided there that the items to be washed are treated with relatively hot water. The hot water can be taken before or during the respective program step.

A recording of hot water for such a program step is particularly energy and more cost-effective than a recording of cold water when the hot water supply system, in particular thermal solar system, provides sufficient heat energy. The reason for the increased cost efficiency is that when receiving hot water, the internal electrical energy consumption of the dishwasher for a rinse by a reduced electrical energy consumption for heating the absorbed water drops significantly. This can lead to a significant reduction in household electricity costs. In this way, an increase in efficiency compared to a dishwasher can be achieved, which is provided exclusively for connection to a cold water supply.

According to a preferred embodiment of the invention it is provided that in the first operating mode at least one washing program can be called, which at a Rinse additionally provides for the use of cold water from the cold water supply. In this embodiment, the first mode is a combined hot and cold water operation. The at least partial use of cold water from the external cold water supply makes it possible to efficiently carry out program steps in which the use of high-temperature water has no advantages or even disadvantages. Again, the recording of the cold water before or during the respective program step can be done.

Unlike a dishwasher, which is intended exclusively for connection to a hot water supply, so spültechnologische disadvantages can be avoided, which could occur by a forced use of hot water in specific program steps. In addition, by the partial intake of cold water from the external cold water supply, the amount of hot water, which must be removed from the external hot water supply for a rinse can be reduced, without thereby substantial disadvantages in terms of cleaning effect and / or the drying effect would have to be accepted. In this way, it can be ensured in the first operating mode that the amount of hot water supply withdrawn from the hot water supply system, in particular the solar system, when carrying out a rinse cycle is limited to a minimum. As a result, the first operating mode can also be usefully selected if the solar collectors supply comparatively little heat energy.

Overall, so in the first mode rinsing programs for controlling a rinse are possible, which provide the implementation of individual program steps using hot water from the external hot water supply and the implementation of other program steps using cold water from the external cold water supply. In this way, compared with known dishwashers, which - as is usual in Europe in particular - are provided exclusively for connection to a cold water supply, as well as with respect to known dishwashers which - as is common in North America in particular - exclusively for connection to a hot water Water supply are provided, a significant increase in efficiency can be achieved.

According to a preferred embodiment of the invention, an operating device is provided, which enables a manual selection of the operating mode. Such an operating device allows the operator to decide for himself whether hot water may be used, or whether only cold water should be recorded. The operating device may be, for example, an additional button, which is arranged on a control panel of the dishwasher. But it is also possible to provide for switching the operating mode operating devices, which are already provided for other operating procedures. Conceivable are multifunction buttons, knobs, touch screens, alphanumeric input units and the like.

According to an expedient development of the invention, the dishwasher has a data interface, which is provided for receiving operating data of the hot water supply system, in particular solar thermal system, wherein the flow control device is designed for automatic selection of the operating mode based on received operating data. Such operating data can be, for example, information relating to the power of the hot water supply system, in particular of the solar collectors, or information relating to the amount of heat stored in a heat accumulator of the solar system. In this way, an automatic selection of each more efficient mode is possible.

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 washing programs of the two modes recording hot water from the hot water supply and / or 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 the connecting piece is provided externally of the dishwasher, and that the downstream end of the hot water hose and the downstream end of the cold water hose via the connecting piece are liquid-conductively connected to a supply hose, which is connected to the device-side, in particular housing-fixed connection piece the dishwasher can be coupled or coupled. Such Y-branch-like design of the water supply device is structurally simple and significantly shortens the hose length required in many cases, in particular if the connection points of the external hot water supply and the external cold water supply continue from the place of installation of the dishes. Dishwasher are removed, since in this case can be dispensed with two longer parallel tubes.

As an alternative to this external arrangement of, in particular Y-branch, connector 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 molded with this is. This can in particular already be prepared from the outset from the factory. In this embodiment variant, the common inlet hose can possibly be saved. In particular, the connection piece may be provided together with the Y-connection piece in the region of the base assembly on or in this.

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 wherein 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 cold water supply and wherein a downstream end of the hot water inlet and a downstream end of the cold water inlet are connected via a connecting piece liquid-conductively connected to a housing-fixed connection piece of the dishwasher, which is characterized in that of the flow control device in a first mode for at least one program step at least one rinsing program for rinsing Warm water from the external hot water supply, which in particular for is partially fed by a solar thermal system is used, and is used in a second mode for at least one program step at least one wash program for rinsing ware 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 advantageous embodiment of a dishwasher according to the invention;

Figure 2 is a block diagram of the dishwasher of Figure 1;

FIG. 3 shows a wash program of a first operating mode of the dishwasher of FIG. 1 and FIG

FIG. 4 shows a wash program of a second operating mode of the dishwasher of FIG. 1.

In the following figures, corresponding parts are provided with the same reference numerals. In this case, only those components of a dishwasher are 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 three-dimensional view of an advantageous 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 produced. 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 or hot water Water supply system WH, in particular hot water line, and the cold water inlet 8, 9 for receiving cold water from an external cold water supply KH, in particular cold water line, is provided.

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 formed so that they can be attached to fittings WH, KH 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. At its output side, a common inlet hose 1 1 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 can be used as safety hoses with an internal water hose. be formed pressure hose and an outer sleeve, wherein between the pressure hose and sleeve each a leakage water channel for discharging any leak water may be provided. In this case, the connecting piece 10 may be formed such that the leakage water passages of the hot water hose 7, the cold water hose 9 and the common inlet hose 11 are connected to one another, so that leakage water, which occurs during operation of the dishwasher 1 in the region of the water inlet device 5, is passed through the housing-fixed connector 12 in 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 in particular already be prepared from the outset from 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.

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.

The dishwasher 1 also has a sequence control device 19 for controlling the course of a rinse cycle after a rinse program. In this case, the sequence control device has a first operating mode, in which one or more rinsing Program can be called, which at least partially provide a use of hot water from the hot water supply WH in a rinse. Furthermore, the flow control device has a second operating mode, in which one or more washing programs can be called, which only provide for a rinse cycle use of cold water from the cold water supply KH.

The sequence control device 19 is connected to an operating device 20, which is arranged on a control panel of the door 3 of the washing compartment 2. The flow control device 19 itself is arranged inside the door 3. However, both could also be arranged elsewhere on the dishwasher 1. The operating device allows the operator to manually set the desired operating mode and manually select an individual program available in the selected operating mode. Optionally, the dishwasher 1 has a data interface 20a, which is provided for receiving operating data of the hot water supply. For this purpose, it can be connected via a data line, for example, with a control of the solar thermal system. The data interface 20a is furthermore connected to the sequence control device 19, wherein the sequence control device 19 is designed to automatically select the mode based on the received operating data. For example, it is possible for the dishwasher 1 to automatically switch to the second operating mode if the power of the solar collectors SOK falls below a certain limit value. It is also possible to automatically control the operating mode as a function of the temperature in the heat exchanger WT. It can also be provided that is automatically changed to the second mode when the auxiliary heater ZH is turned on.

Figure 2 shows a block 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 compartment 2, a circulation pump 22 designed as a heating pump is arranged, which is connected to a spray system 23 arranged inside the washing compartment 2. 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 24 is arranged in the sump, which makes it possible to pump out no longer needed water to the outside. In the case of the circulation pump 22, both the heating function of the electrical heating device 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 operating device 20 is connected to the sequence control device 19 such that operating commands can be transmitted from the operating device 20 to the sequence control device 19. Furthermore, the data interface 20a is connected to the sequence control device 19 such that the operating data of the solar thermal system TSA received by the data interface 20a can be transmitted from the data interface 20a to the sequence control device 19.

The feeding of the dishwasher 1 with water, as well as the control of the circulation pump 22 and the drain pump 24 and other not explained here devices of the dishwasher 1 as a function of a selected wash program. The rinse programs are stored in the flow control device 19, wherein depending on the set operating mode different rinse programs can be called. At least one rinsing program is provided in the first operating mode, which is specifically selectable for the efficient use of solar thermal heated water.

FIG. 3 shows an exemplary washing program SP1 of the dishwasher 1 of FIGS. 1 and 2, which can be selected in the first operating mode. The wash program SP1 is intended to control a wash cycle when the hot water supply device 6, 7 of the dishwasher 1 is supplied with solar thermal generated hot water from a thermal solar system TSA. 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. Here, a with hot water from the hot water supply WH charged rinse tank 2 with "WW", a supplied with cold water from the cold water supply KH washing tank 2 with "KW" and an empty washing container 2 by "0".

FIG. 3 shows, by way of example, a rinsing program SP1, 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. It is therefore a typical normal rinsing program SP1, which is intended for cleaning normally soiled items. 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 the circulating 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 can be dispensed with during the pre-rinse step in many cases. Thus, a reheating by means of the electric heater of the circulation pump 22 can be omitted or performed 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 6 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 container 2 hot water is now circulated by means of the circulation pump 22 for a predetermined time, so as to pressurize the dishes with hot water. In this case, the heating device of the circulation pump 22 can be switched as needed as a function of the temperature of the supplied hot water and in dependence on the intended rinse 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 thermal solar system TSA in many cases not at all, in other cases only to a small extent, by the electric heater of the circulation pump 22 of the Dishwasher 1 must be reheated to reach the required 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 circulation 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.

As a rule, no higher temperatures are required during the intermediate rinsing step ZS, so that cold water from the cold water supply can also be used in the intermediate rinsing step ZS without this having to be heated by means of the electric heating device of the circulating pump 22 with a 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 6 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 container 2 hot water is now circulated by means of the circulation pump 22 for a predetermined time, so as to pressurize the dishes with hot water. During the rinsing step KS, too, the electric heating device of the circulating pump 22 can be switched on as required as a function of the temperature of the hot water supplied and as a function of 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 of 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, must be reheated by the electric heater in the circulation pump 22 of the dishwasher 1 to the to achieve the temperature required for the final rinse step KS.

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

FIG. 4 shows an exemplary washing program SP2 of the dishwasher 1 of FIGS. 1 and 2, which can be selected in the second operating mode. The wash program SP2 is intended to control a wash cycle when the hot water supply WH is supplied with hot water generated by the auxiliary heater ZH.

The rinsing program SP2 is likewise a normal rinsing program SP2, which corresponds to the normal rinsing program SP1 described above in such a way that it has a substantially identical cleaning and drying action. The difference is that the wash program SP2 only provides for the use of cold water from the cold water supply KH. This avoids that the hot water supply WH heat energy is withdrawn, for example, if the solar panels SOK supply too little heat energy. In program steps RS, KS, in which it is necessary or desirable to apply the wash ware with water at a higher temperature, ie in particular in the cleaning step RS and Klarspülschritt KS, provided for acting on the wash water by means of the electric heater, in particular water heater, the Circulation pump 22 are heated. The required additional costs for the electrical energy of the heating of the circulation pump are in many cases less than the additional costs that would be incurred if an additional heating ZH for the solar thermal system TSA would have to be turned on due to an additional hot water withdrawal.

The invention relates in an advantageous embodiment, a dishwasher with an additional function key in particular for the selection of hot water from a hot water solar system. In this case, two water connections are expediently provided which can be controlled separately with each valve, in particular an Aquastop valve. That The dishwasher has a bithermic water connection with hot water inlet and cold water inlet. A water connection is therefore for hot water, especially warm inexpensive solar water, another water connection is provided 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.

On this basis, the dishwasher has now received an additional function key (solar button), which can be arranged on the panel. When this button is pressed, special flushing sequences can be activated in the control unit, which are designed for the hot water of a hot water solar system. The manual selection can be omitted if the dishwasher z. B. by data transmission, the information is transmitted, in which way - solar or eg with fuel oil - just heated.

The goal of these special programs is to keep the rinsing and drying performance constant at the lowest energy consumption, without the operator having to remember to reconnect the water supply.

The dishwasher can now respond to this change by pressing the auxiliary function button in various ways to achieve the goal of getting as good energy-saving good rinsing and drying performance. The customer can even in the summer months in bad weather or at the transition to the winter months his dishwasher switch to cold water operation by pressing a button when the hot water solar system too little energy is fed into the hot water tank.

In particular, it may be appropriate, if necessary, in place of or in addition to the solar thermal system for the provision of a cost hot water supply in the home, if necessary, a modern condensing boiler such. 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 of fossil fuel carriers or use only largely CO ₂ neutral energy sources. The explanations given in the case of a solar thermal hot water production plant apply in the presence or presence of another hot water supply system with regard to the design 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

20 Operating device 20a interface

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 SP1 wash program of the first operating mode

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

VS pre-rinse step

RS cleaning step

ZS intermediate rinse step

KS rinse step

TS drying step

SP2 washing program of the second operating mode

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) are provided, wherein a downstream end of the hot water inlet (6, 7) and a downstream end of the cold water inlet (8, 9) via a Connecting piece (10) liquid-conducting with a housing-fixed connection piece (12) of the dishwasher (1) is connected, and with a flow control device (19) for controlling a wash cycle for cleaning items to be washed, characterized in that the hot water inlet (6, 7) for receiving Hot water from an external hot water supply (WH), which in particular at least partially by a thermal solar system (TS A), is provided, wherein the sequence control device (19) has a first mode in which at least one rinsing program (SP1) can be called, which provides for a rinse using hot water from the hot water supply (WH), and wherein the flow control device (19) has a second mode, in which at least one rinse program (SP2) can be called, which provides for a rinse only use of cold water from the cold water supply (KH).

2. Dishwasher according to the preceding claim, characterized in that in the first operating mode at least one washing program (SP1) can be called, which at least one program step (RS, KS) for rinsing dishes by using hot water from the hot water supply (WH) provides.

3. Dishwasher according to at least one of the preceding claims, characterized in that in the first operating mode at least one washing program (SP1) can be called, which additionally provides for a rinse a use of cold water from the cold water supply (KH).

4. Dishwasher according to at least one of the preceding claims, characterized in that an operating device (20) is provided, which allows a manual selection of the mode.

5. Dishwasher according to at least one of the preceding claims, characterized in that the dishwasher (1) has a data interface (20a) which is provided for receiving operating data of the external hot water supply (WH), in particular a solar thermal system (TSA), wherein the Sequence control device (19) is designed for automatic selection of the operating mode based on received operating data.

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

8. Dishwasher according to at least one of the preceding claims, characterized in that the connecting piece (10) externally of the dishwasher (1) is provided, and that the downstream end of the hot water hose (7) and the downstream end of the cold water hose (9) via the Connecting piece (10) liquid-conducting with an inlet Running hose (11) are connectable, which is coupled to the device-side connector (12) or coupled.

9. Dishwasher according to at least one of claims 1 to 7, characterized in that the connecting piece (10) on the device side, in particular device-internally, on the device-side connector, in particular without external inlet hose (11), can be coupled or coupled.

10. 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 Receiving 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), and wherein a downstream end of the hot water inlet (6, 7) and a downstream end of the cold water inlet ( 8, 9) via a connecting piece (10) liquid-conductively connected to a housing-fixed connection piece (12) of the dishwasher (1), in particular according to at least one of the preceding claims, characterized in that of the flow control device (19) in a first mode for at least a program step (RS, KS) at least e Ines Spülprogramm (SP) for washing hot water from the external hot water supply (WH), which is at least partially fed by a solar thermal system (TSA) is used, and in a second mode for at least one program step (RS, KS) at least a wash program (SP) is used to rinse ware cold water from the external cold water supply (KH).