WO2009074418A1

WO2009074418A1 - Method for optimizing the drying performance

Info

Publication number: WO2009074418A1
Application number: PCT/EP2008/065350
Authority: WO
Inventors: Heinz Heissler; Kai Paintner
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2007-12-11
Filing date: 2008-11-12
Publication date: 2009-06-18
Also published as: DE102007059514A1

Abstract

The invention relates to a method for optimizing the drying performance of a drying process (12) of items to be dried, especially of items (28) to be cleaned in a dishwasher. The method according to the invention comprises the following steps: heating and applying liquid, especially washing liquor, to the items to be dried, especially the items (28) to be cleaned, detecting at least one input parameter influencing the drying performance, and adapting at least one drying parameter of the drying process (12) depending on the at least one detected input parameter to optimize the drying performance.

Description

Method for optimizing the drying performance

The invention relates to a method for optimizing the drying performance of a drying process of material to be dried, in particular of items to be washed in a dishwasher.

In conventional dishwashing machines with self-heat drying, heat is supplied to the interior of the washing chamber of the dishwasher by means of a heating device, but the moisture is not removed. The internal air in the rinsing chamber increases its temperature and can thus absorb an increased relative humidity. By means of a cold surface communicating with the interior, the drying efficiency is further increased. The moisture from the inner air can condense on it, as a result of which the moisture absorption capacity of the inner air is maintained or increased.

It is independent of the load, d. H. the amount and the heat capacity of the items to be washed, the items to be washed in a heating phase preceding the actual drying cycle, such as a rinse cycle, heated to a predetermined initial temperature. The initial temperature is about 65 ° C, d. H. well above ambient temperature and a rinse temperature from a previous rinse. The initial temperature is such that a sufficient drying result is achieved for a standard load. After the heating phase dried in these conventional dishwashers, the heated dishes in the closed rinsing chamber for a predetermined drying time. This process always requires the same energy input regardless of the loading.

The invention has for its object to enable optimization of the drying performance while reducing energy consumption.

The method according to the invention for achieving the object of the invention comprises at least the following steps:

Heating and application of liquid, in particular rinsing liquor, to the material to be dried, in particular ware, - Detecting at least one input parameter, the

Drying performance influenced, and

Adjusting at least one drying parameter of the drying operation in dependence on the at least one detected input parameter to optimize the drying performance.

It is preferably provided that the adaptation of the at least one drying parameter takes place before the beginning of the drying process. That is, there is no continuous control, but a one-time determination of the drying parameters that determine the subsequent drying process. Furthermore, it is preferably provided that at least one input parameter is detected before the start of the drying process.

The drying performance comprises as parameter at least the drying time required for drying the material to be dried, in particular ware, required energy and / or the degree of drying of the dried material, in particular the ware. In this case, an optimization with regard to the time required for the drying, the energy requirement and the degree of drying for a selected parameter or a weighted combination of selected parameters.

An input parameter may be a load of material to be dried, in particular items to be washed, a water inlet temperature or an ambient temperature. These mentioned input parameters directly affect the drying process, as they change the heat capacity as the ware or affect how the water inlet or ambient temperature drying.

A drying parameter can be an initial temperature (T ₀ ) for a drying process and / or a degree of drying of material to be dried, in particular items to be washed. These two drying parameters allow a characterization of a drying process with a self-heat drying.

It is preferably provided that an adaptation of the at least one drying parameter takes place after a comparison with at least one reference value. This allows a particularly simple but reliable adaptation of the Drying parameters based on a standard load reference value. It is preferably provided that a subtraction of the at least one drying parameter and the at least corresponding reference value takes place, this difference being used to adapt the at least one drying parameter.

Depending on the degree of loading and the ambient situation, either the energy required in the heating phase can be reduced or increased, or the drying time of the subsequent drying cycle can be shortened, while still achieving a satisfactory drying result in the drying cycle. By adapting the initial temperature to the actual load and the environmental situation, the energy required for this purpose can be used in a more targeted manner and saved with less loading and less energy loss.

In principle, the loading level can be selected or set by an operator before the start of a rinse cycle. This can be done steplessly between a minimum and a maximum load setting value or in setting steps such as "low", "normal" or "standard" or "high". In this way, the operator can influence the drying result according to his choice.

According to a further advantageous embodiment of the invention, however, the loading can be detected automatically. This eliminates a complicated operation step, making the dishwasher is more comfortable to use.

Before the initial temperature is controlled, the method may include the steps of: (a) automatically determining the current load (B _ιst ) with items to be washed, (b) upon occurrence of a deviation (ΔB: = B _ιst - B _s t _an da _r d) current loading (B _ιst ) of a

Standard loading (B _s t _an da _r d) _> Determining a deviation (ΔT ₀ : = T ₀ - T ₀ , _S ta _n da _r d) for the

Start temperature (T ₀ ) of one of the standard load (B _stan da _r d) assigned

Standard start temperature (T ₀ , _S ta _n da _r d) - By the automatic load determination so the heating time and / or the drying time can be determined depending on the load, but independent of a manual setting by the operator. Advantageously, the regulation of the initial temperature as a function of the loading is carried out only if a deviation (ΔB) of the current load (B _ιst ) from the standard load (B _s t _an da _r d) occurs, wherein the deviation (ΔB) is greater than one Deviation threshold (δB). On the one hand, the control effort can be reduced and, on the other hand, the risk of the occurrence of control errors can be minimized.

In a further embodiment, step (b) comprises several sub-steps: First, it is checked whether the current load (B | _St ) is greater or less than the standard load (Bsta _n da _r d). For a larger current loading (B _ιst ), the initial temperature (T ₀ ) is set higher than the standard starting temperature (T ₀ , _S ta _n da _r d); _(ιst B) for a lower current loading, the initial temperature (T ₀₎ is lower than the standard initial temperature (T _0, _S ta _n as _r d) in order thus to save energy in the heating phase and / or time. Even for a higher load so a sufficient drying result is achieved, for which in the heating phase, however, more energy is required. At lower load energy is saved in the heating phase for this purpose and with a suitable choice of the initial temperature in the drying phase still achieves a sufficient drying result.

In the aforementioned embodiment, in step (b), the deviation of the initial temperature (ΔT ₀ ) in proportion to the deviation of the load (ΔB) from the standard load (B _st a _n da _r d) can be selected. Thus, the load-dependent choice of the initial temperature is particularly simple or the algorithm for determining the initial temperature particularly easy to implement.

The degree of loading can be expressed by detecting the heat capacity of the load (total heat capacity). The determination of the heat capacity can by detecting a course of the temperature of the dishes or a

Condensation surface over a period of time, ie on the time dependence of the

Temperature, done. By the same principle, alternatively, a change in the

Mixture temperature of the rinse liquor, for example, be detected between two cleaning cycles. The initial temperature for the self-heat drying cycle can be controlled with a substantially constant power and depending on the load, until the starting temperature dependent on the loading is reached. The control is technically very simple.

Alternatively, the heating means can be supplied with a heating output which is regulated as a function of the load, that is to say with a load-dependent heating gradient. In this way, the load-dependent initial temperature can be achieved in a substantially constant, predetermined heating time. This control method is advantageous if the heating phase coincides with the rinse cycle, for which a substantially fixed final rinse time can be predetermined.

In addition, the method may be supplemented to detect a characteristic feature of the time dependence (T (t)) of the characteristic temperature (T) indicative of the degree of evaporation of water from the surface of the dishes. Thus, the achievement of complete drying can be detected and the drying cycle to be completed when complete drying. In the actual drying cycle, this can save time with a low degree of loading and nevertheless achieve a satisfactory drying result at a high degree of loading.

The method described so far considered the load as the starting point for determining the initial temperature of the drying cycle. Alternatively or additionally, variables of the environmental conditions can be taken into account. These include, for example, the outside temperature with seasonal fluctuations and the installation situation with the insulation against the environment. By means of additional temperature sensors, the outside wall temperature at a condensation surface of the automatic dishwasher or in dishwashers with a water storage serving as a heat store can be detected from the water inlet temperature. In this case, the water inlet temperature can be detected by a temperature sensor, which is arranged in the serving as a heat storage water storage. In dishwashers without serving as a heat storage water storage can be arranged for this purpose a temperature sensor in the water inlet of the dishwasher. Alternatively or additionally, for this purpose, a temperature sensor may be provided which is in contact with rinsing liquor. Furthermore, it can preferably be provided that the turbidity, in particular of the circulated rinsing liquor, is taken into account as the input parameter. For this purpose, the turbidity can be detected optically, for example with corresponding turbidity sensors, or by means of impedance measurements.

To solve the object of the invention also includes a dishwasher. The dishwasher has means for heating and applying liquid, in particular rinsing liquor, to the material to be dried, in particular items to be washed, further comprising means for detecting at least one input parameter that influences the drying performance, and means for adjusting at least one drying parameter. Thus, as well as for the inventive method, taking into account the load and the current environmental situation, the initial temperature for the drying cycle can be adjusted so that optimum drying is achieved for each degree of loading and each environment. For this purpose, either the energy required in the heating phase can be reduced or increased, or the drying time of the subsequent drying cycle can be shortened, and nevertheless a sufficient drying result can be achieved in the drying cycle.

The dishwasher may include means for manually inputting the level of loading by an operator, for example a two or more level switch, with low, normal and high load levels. This allows the operator to enter the degree of loading and thus allow the load-dependent control of the drying cycle.

Preferably, the dishwasher comprises means for determining the current load (B _ιst ). Thus, the current load can be determined automatically, ie without input by an operator. This considerably simplifies the operation of the dishwasher.

The loading can also be detected indirectly via a detection of the heat capacity of the items to be washed or the change in the heat capacity through the introduced items to be washed. To determine the heat capacity, the dishwasher can a Temperature sensor for detecting a temperature of the dishes and include means for evaluating a detected temperature profile over a period of time. The temperature sensor may be arranged in the rinsing chamber or in the circulation circuit and be in contact with the circulated water, which in turn is in heat exchange with the items to be washed. In addition, a second temperature sensor with associated evaluation means for detecting the temperature of not yet heated fresh water may be present. In dishwashers, which include a heat accumulator due to design, the second temperature sensor can be arranged therein.

To detect the ambient conditions, the dishwasher may have temperature sensors on an outer wall as a condensation surface, in the loading door or the addition of detergent. For example, seasonal

Fluctuations in the outside temperature and the installation situation of the dishwasher, including its thermal insulation against its environment are detected. at

Dishwashers with a heat exchanger, another sensor may be arranged therein to detect the water inlet temperature, which may also be subject to seasonal fluctuations, for example. It can the

Water inlet temperature can be detected with a temperature sensor in the as

Heat storage serving water storage is arranged. In dishwashers without serving as a heat storage water storage can be arranged for this purpose a temperature sensor in the water inlet of the dishwasher. Alternatively or additionally, for this purpose, a temperature sensor may be provided which is in contact with rinsing liquor.

The dishwasher may comprise a control unit which is designed to carry out the method described above or its sections and variants. It may be designed to perform one or more of the functions mentioned in hardware or else in the form of software stored in a program memory.

The principle of the invention will be explained in more detail below with reference to a drawing by way of example. In the drawing show:

Fig. 1 shows the time dependence of a temperature during the operations in the washing compartment of a dishwasher with self-heat drying. 2 shows the time dependence of the temperature in the washing compartment of the dishwasher during the rinsing and drying cycle for different loads;

3 shows a schematic cross-section (in side view) of a dishwasher according to the invention according to a first embodiment; and

4 shows a schematic cross section (in front view) of a dishwasher according to the invention according to a second embodiment.

Fig. 1 shows the known operations in a dishwasher with self-heat drying. They include a pre-rinse cycle 2, a first cleaning cycle 4, a second cleaning cycle 6, an intermediate rinse 8, a rinse cycle 10 and a drying cycle 12 concluding the operations. In the pre-rinse cycle 2, cold fresh water (about 3.4-3.9 l) is supplied and circulated for a preset duration of about 15 minutes by a circulation pump 20 through the purge chamber. In the subsequent cleaning cycle 4, the cleaning agent is introduced into the rinsing chamber 14 (see FIGS. 3 and 4). The fresh water of the pre-rinse 2 is heated to an initial cleaning temperature of about 51 ° C for a period of about 13 to 14 min. In the subsequent cleaning cycle 6, the heated and provided with the detergent water is circulated, whereby the main cleaning of the dishes 28 is effected.

Between the cleaning cycle 6 and the intermediate rinse 8, the rinsing water is pumped out of the rinsing chamber 14 and fed clean, cold fresh water. The fresh water is circulated during the intermediate rinse 8 for a period of about 5 min and thereby heated, inter alia, by contact with or heat transfer from the cleaning cycle 6 still warm parts, such as the washware 28, possibly a heat exchanger 38 (FIG. Fig. 4) and the walls of the washing chamber 14 and the components in a circulation circuit 22a, 20, 22b, which are in heat transfer with the circulating water. To change from the intermediate rinse 8 in the subsequent rinse cycle 10, the intermediate rinse water is pumped out of the rinsing chamber 14 and fed again cold fresh water. In conventional dishwashers with self-heat drying, the supplied, cold fresh water in the rinse cycle 10 during a predetermined, fixed time, z. B. about 15 min, circulated and thereby with a predetermined, fixed heating power to the initial temperature T ₀ for the final drying process 12, z. B. to about 65 ° C, heated.

FIG. 2 illustrates the time course of the temperature or the time dependence of the temperature in the rinsing chamber for different loadings during the rinse cycle 10 and the drying cycle 12. The temperature may be representative of the temperature of the dishes 28 or a temperature measured by a first temperature sensor 32 T1 be the circulated water. The middle curve in Fig. 2 shows the time course of the temperature in the washing chamber for a defined standard load B _s t _to da _r d with crockery and cutlery. The upper or lower curve in FIG. 2 represents the time course of the temperature in the rinsing chamber, which for a loading B +: = B _standard + ΔB which is higher in comparison to the standard load B _s t _an d _r d, or one compared to the standard load lower loading B- = B _standard -ΔB is set. By supplying the heating power, the temperature in the rinsing chamber 14 and thus also the temperature of the washware 28 during the rinse cycle 10 increases substantially in proportion to the time t. The less than proportional increase in temperature shown in FIG. 2 is a result of heat transfer losses, including through the walls of the washing chamber 14 and through the loading door 16, to parts of the appliance outside the washing chamber 14.

For the standard load B _stan da _r d, the temperature during the heating phase in the rinse cycle 10 is controlled according to the middle curve in Fig. 2 to an initial temperature T ₀ , _s ta _n da _r d and then immediately begins the Eigenwärmetrockungsgang 12. For drying, the complete evaporation of the water film on the items to be washed, at the higher or lower loading B + or B- a correspondingly larger or smaller energy input in the form of heating to the initial temperature T ₀ for the self-heat drying is required. Accordingly, for the higher or lower loading B + or B-, the temperature is controlled according to the invention during the heating phase to a higher or lower initial temperature T ₀ (B +) or T ₀ (B-) for the own heat-drying cycle 12. With the switching off of the heating power supplied to the circulating water during the rinse cycle 10, the drying cycle 12 begins. For the normal loading Bsta _n da _r d, the temperature in the rinsing chamber changes its course essentially in accordance with a falling exponential function. As the temperature in the rinsing chamber decreases, the load increasingly dries, ie a moisture film present on the washware 28 evaporates and condenses on a condensation surface. At a time dependent on the loading t ₁₂ , a temperature T _{12 is} reached, which then changes only insignificantly and marks the achievement of a substantially asymptotic state. Then, the moisture film on the dishes 28 is completely evaporated and the drying course 12 can be terminated. Here, the temperature in the rinsing chamber is the above-mentioned characteristic temperature T, and the reaching of the temperature T ₁₂ is the above-mentioned characteristic feature.

For the standard loading B _s t _an da _r d, the temperature in the purge chamber decreases from the initial temperature To (B _stan da _r d) corresponding to the middle curve in FIG. 2 until at the temperature T ₁₂ , _{B s} ta _n da _r d reached at a time t _{12 of} the asymptotic state and the drying cycle can be stopped. For the higher charge B + = B _standard ⁺ ΔB or the lower charge B- = B _standard -AB in comparison with the standard load, the temperature in the wash chamber drops from the initial temperature T ₀ (B +) or T due to the larger or smaller heat capacity ₀ (B-) off from time slower or faster, as shown in the upper and lower curve of FIG. 2. The load-dependent regulation of the initial temperature T ₀ (B), however, at a higher loading B + causes the asymptotic state to be reached earlier due to the higher initial energy input or higher initial temperature T ₀ (B +) than without adjusting the initial temperature. By a suitable choice of the initial temperature T ₀ (B +) can be achieved that the time until complete drying (at time t ₁₂ ) is the same as for the standard load. At a lower charge B- can be saved by the lower initial energy input or the lower initial temperature T ₀ (B-) in the heating phase energy. In the drying cycle, the asymptotic state or the complete drying must be achieved no later than in comparison to the standard loading. Loading-dependent regulation of the initial temperature for the self-heat drying cycle can thus achieve a constant drying time at different loads. Furthermore, at high load B + can relative shortening of the drying time and at low loading a relative energy saving in the heating phase can be achieved.

The dishwasher shown in FIG. 3 comprises a rinsing chamber 14, in which the items to be washed 28, namely plates 28a and cups 28b, are placed in a loading basket 30, a loading door 16 hinged to the rinsing chamber 14, a water spray rotatably arranged in the rinsing chamber 14. Rotary arm 24 with spray nozzles 26, a arranged below a bottom wall 19 of the washing chamber 14 circulating pump 20 for circulating the water or the rinsing liquor, an inlet 22a of the circulation line, which connects a pressure output side of the circulation pump 20 with the water spray rotary arm 24, a drain 22b of Circulation line in the bottom wall 19 of the washing chamber 14, which is connected to a suction side of the circulation pump 20, a arranged on the inlet 22 a of the circulation line heater 56 for heating the circulating water, a control unit 58 for controlling all the essential functions, operations and components or devices Dishwasher and for reading and evaluating de Measuring signals of various sensors, a connecting line 48 with a connection 44 at one end for the supply of fresh water, a controllable connection valve 50 in the connection line 48 for controlling the fresh water inlet, a drain line 52 for discharging spent detergent or water, a controllable drain valve 54th in the drain line 52 for closing the drain line or controlling the discharge and a first temperature sensor 32 and a second temperature sensor 34th

The first temperature sensor 32 is arranged in the circulation pump 20 and serves to detect the temperature T1 of the water or the rinsing liquor in the circulation circuit. However, it may also be disposed at other positions in the circulation circuit, such as in the inlet 22a, in the drain 22b or in a depression in the bottom wall of the washing chamber 14 in the vicinity of the opening of the drain 22b. The second temperature sensor 34 is arranged in contact with the inside wall, ie the wall of the loading door 16 facing the rinsing chamber 14, and serves to detect a reference temperature T2 characteristic of the temperature of a cold surface in the rinsing chamber 14. However, it can also be arranged at other positions, such as in a control panel 18 in the loading temperature 16. There he can easily with there already existing electrical Cables are connected to the associated, in the control unit 58 integrated temperature reading device.

The heater 56 is connected by a control line 56s to the control unit 58 and so controllable in terms of their heating power. In the control unit 58 is one of the standard load B _s t _to dard associated standard initial temperature To (B _s t _to dard) preprogrammed for the drying passage 12, in which a sufficient drying result, the standard load is achieved. Depending on the determined by measurement actual load B, _st or determined by the control unit 58 deviation ΔB from the standard load, the control unit 58 determines before the start of the rinse 10 a deviation AT _{0 of} the initial temperature with respect to the standard initial temperature T ₀ (B _stan da _r d), or a deviating initial temperature T ₀ (B _1St ) for the drying _cycle 12. In the final rinse 10, the control unit 58 controls the heating element 56 according to the load-dependent determined initial temperature T ₀ so that the water in the circulation Initial temperature T ₀ reached. Via the first temperature sensor 32, which detects the temperature of the circulated water, the control unit 58 checks or recognizes the achievement of the desired initial temperature T ₀ . As a result of the circulation in the rinse cycle 10, the water transfers the initial temperature T ₀ to the washware 28.

The dishwasher according to FIG. 4 comprises the connection line 48 provided with the controllable connection valve 50 for filling the heat exchanger 38 with fresh water and a connecting line 40 for transferring water between the heat exchanger 38 and the circulation circuit and a third temperature sensor 36 arranged in the heat exchanger for detecting the temperature T3 of the water in the heat exchanger 38. The connecting line 40 can be opened and closed by the controllable connection valve 42. The valve 42 is connected to the control unit 58 by a control line 42s and thereby controllable. When the valve 42 is closed and the valve 50 is opened, the heat exchanger 38 is filled with cold fresh water. Conversely, when the valve 42 is opened and the inlet valve 50 is closed, the heat exchanger 38 is filled with water from the recirculation circuit, which may be heated if necessary. The heat exchanger 38 is formed in the shape of a container arranged parallel to the side wall of the washing chamber 14 and abuts against the side wall. The third temperature sensor 36 is arranged in contact with the flushing chamber 14 facing wall of the heat exchanger 38. To improve the efficiency of the heat drying of the heat exchanger 38 is filled during the drying cycle 12 with cold fresh water. As a result, the heat exchanger 38 facing side wall of the washing chamber 14 to a cooled condensation surface.

Depending on the actual load B _ιst and / or the measured inlet temperature of the feed at the beginning of Zwischenspülgangs 8 fresh water, the control unit 58, a suitable initial temperature T ₀ so that an optimum drying can be achieved for the drying cycle, as for Fig. 2 has been explained above.

Since the preceding dishwashers and load determinants described in detail are exemplary embodiments, they can be modified in the customary manner by a person skilled in the art to a large extent, without departing from the scope of the invention. In particular, the specific configurations of the dishwasher and load determination means may follow in a different form than that described here. Likewise, the dishwasher and the loading determining means can be configured in another form, if this is necessary for reasons of space or designerischen reasons. Furthermore, the use of the indefinite article "on" or "one" does not exclude that the characteristics in question may also be present multiple times.

LIST OF REFERENCE NUMBERS

2 prewash / pre-rinse

4 cleaning cycle / cleaning

6 Cleaning cycle / cleaning 8 Intermediate rinse / intermediate rinsing

10 rinse cycle / rinse

12 drying cycle / drying

14 rinsing chamber

16 Loading door 18 Control panel

19 base plate

20 circulation pump

20s control line for circulation pump

22a Inlet of the circulation line 22b Outflow of the circulation line

24 water spray rotary arm

26 spray nozzles

28 items to be washed

28a plate 28b cup

30 loading basket

32 first temperature sensor (circulation circuit)

34 second temperature sensor condensation surface (eg loading door)

36 third temperature sensor (heat exchanger) 38 heat exchanger

40 connection line

42 connection valve

42s control line for connection valve

44 Connection 46 Connection tap

48 connecting cable

50 connection valve

50s control line for connection valve drain line

Drain valve s Control line for drain valve

Heating device s Control line for heating device

control unit

Claims

1. A method for optimizing the drying performance of a drying process (12) of goods to be dried, in particular of items to be washed (28) in one

Dishwashing machine, comprising at least the following steps:

Heating and applying liquid, in particular rinsing liquor, to the material to be dried, in particular items to be washed (28), - detecting at least one input parameter which the

Drying performance influenced, and

Adjusting at least one drying parameter of the drying operation (12) in dependence on the at least one detected input parameter for optimizing the drying performance.

2. The method according to claim 1, characterized in that the adaptation of the at least one drying parameter before the start of the drying process (12).

3. The method according to any one of claims 1 or 2, characterized in that at least one input parameter before the start of the drying process (12) is detected.

4. The method according to any one of claims 1 to 3, characterized in that the drying performance as a parameter, the drying time required for drying the material to be dried, in particular items (28), energy required and / or the degree of drying of the dried Guts, in particular the items to be washed , includes.

5. The method according to claim 4, characterized in that the drying time, for drying the material to be dried, in particular items to be washed (28), required energy and / or the degree of drying of the dried material, in particular of the items to be washed (28), as parameters to be optimized the drying capacity is selected.

6. The method according to any one of claims 1 to 5, characterized in that the at least one input parameter is a load of goods to be dried, in particular ware (28) and / or a water inlet temperature and / or a degree of soiling of the washing liquor and / or an ambient temperature.

7. The method according to any one of claims 1 to 6, characterized in that the at least one drying parameter is an initial temperature (T ₀ ) for a drying process and / or a degree of drying and / or a drying time of material to be dried, in particular ware (28).

8. The method according to any one of claims 1 to 7, characterized in that the adaptation of the at least one drying parameter after a comparison with at least one reference value.

9. The method according to any one of claims 1 or 8, characterized in that the adaptation takes place according to a weighted combination of the input and / or drying parameters.

10. The method according to claim 8 or 9, characterized by a difference formation of the at least one drying parameter and the at least corresponding reference value, wherein this difference is used to adapt the at least one drying parameter.

1 1. Dishwasher, in particular for carrying out a method according to one of claims 1 to 10, comprising at least

Means for heating and applying (20, 24, 26, 56) liquid, in particular rinsing liquor, to the material to be dried, in particular items to be washed (28),

Means for detecting at least one input parameter (32, 34, 36) which influences the drying performance, and

Means for adjusting at least one drying parameter (58) of the

Drying operation in dependence on the at least one detected

Input parameters for optimizing the drying performance