EP2523591B1 - Method for determining and displaying energy consumption of a water conveying domestic appliance - Google Patents

Description

The invention relates to a method according to the preamble of claim 1.

From the EP 0 859 304 A1 a method for adjusting the temperature of a process medium in a washing machine is known in which in a temperature control process by controlling the process medium supplied thermal energy, the temperature of the process medium is regulated to a predetermined control interval between an upper switching temperature and a lower switching temperature, during the temperature control process continuously the sum of the thermal energy supplied to the process medium since the beginning of the temperature control process is determined and the supply of thermal energy to the process medium is interrupted when said sum of the supplied thermal energy exceeds a predetermined process energy value.

In practice, for domestic appliances only energy consumption per energy label is indicated, i. the information on the energy consumption is part of the technical documentation of the respective device to be handed over to the customer together with the user manual, quick start guide, warranty certificate and the like. The energy consumption is also for a quick overview in classes, such. B. "A", "A +" etc. arranged. The values given here, however, refer to standard conditions, whereby in the standard u. a. Environmental conditions, the respective cleaning program and the loading condition (quantity or mass) are fixed or defined. If the real conditions at the customer deviate from the specified standard conditions, it is therefore possible in practice for substantial deviations of the actual energy consumption and / or water consumption of the respective household appliance from the consumption information under standard conditions without the customer knowing this.

From the EP 0 844 326 A1 is a method for detecting and suits an energy consumption of a water-conducting household appliance based on an information bank known.

The invention is based on the problem of achieving an improvement here.

This problem is solved by a method having the features of claim 1.

With the invention, a water-conducting household appliance, in particular a dishwasher or washing machine is provided, the determination of, in particular measurement, the temperature profile of a circulating medium, in particular at least one - positive and / or negative - slope of a determined, preferably measured, actual temperature curve, a circulation medium an input or input date for determining, in particular calculation, the actual, current energy consumption of the household appliance wins and determine its real energy consumption, preferably calculate, may take into account the actual, possibly deviating from a standard conditions can.

If, in particular, a gradient of the time-resolved actual temperature profile of the liquid circulating medium can be determined by the domestic appliance, a gradient phase can easily be characterized by this single value, so that the data set of the input variable to be used and the subsequent computation effort can be minimized. In particular, a gradient (degree of _measurement ) of an essentially linearly rising and / or falling actual temperature profile section of the liquid circulating medium can be determined, in particular measured, so that the slope in this area is constant and only a single value for the gradient of this area results.

If data for at least one determined, in particular measured, actual temperature profile of the circulating medium of the household appliance in the currently present loading state with data for at least one reference temperature profile, in particular at least one temperature profile of an unloaded domestic appliance, i. the same household appliance in the unloaded state, and / or at least one temperature profile of the same household appliance with a standardized standard load, are comparable, the deviation between the actual temperature profile and the reference temperature profile is suitably determined. For this purpose, the difference or the quotient between the actual temperature profile and the reference temperature profile (and vice versa) can be formed as the deviation parameter.

In particular, only the difference between the determined, preferably measured, actual temperature profile of the circulating medium of the household appliance in the current, ie present load state and the reference temperature profile of the circulating medium of the household appliance in the unloaded state and / or the difference between the determined, in particular measured, actual temperature profile of the circulating medium of the household appliance in current, ie present loading state and the reference temperature profile of the circulating medium of the household appliance in the Normbeladungszustand be observed in order to obtain a measure of an over the unloaded state and / or the norm increased or decreased energy consumption.

Particularly advantageously, the household appliance includes an integrated evaluation and / or control unit, in particular arithmetic unit, in the data at least to a reference temperature profile such. are stored for the temperature profile of the circulating medium of an unloaded household appliance and / or the temperature profile of the circulating medium of a standard loaded device, so that the comparison with the determined, in particular measured, data of the actual temperature profile is facilitated.

In this case, in the evaluation and / or control unit, in particular arithmetic unit, each of the gradient of a phase of a substantially linearly rising and / or falling temperature profile of the circulating medium of an unloaded household appliance (grad ₀ ) and / or a standard-loaded household appliance (grad _N ) already deposited be able to easily determine the deviation from the actually measured value.

The same applies to the energy consumption of the household appliance in the unloaded state (E ₀ ) and / or in the standard loaded state (E _N ). These are also advantageous in the evaluation and / or control unit, in particular arithmetic unit, deposited.

berechnet werden, ohne dass eine externe Auswertung nötig wäre. Der so ermittelte Energieverbrauch kann vorzugsweise über eine Anzeige, zum Beispiel eine LED-Anzeige, jeweils aktualisiert für die jeweiligen Bedingungen, visuell ausgegeben werden. Selbstverständlich sind auch sonstige Anzeigemöglichkeiten verwendbar. Insbesondere kann die Anzeige zusätzlich oder unabhängig von einer visuellen Informationsausgabe auch akustisch erfolgen.According to an advantageous embodiment of the invention can be automated with the said deposited data or on request by the user in the evaluation and / or control unit, in particular arithmetic unit, the actual energy consumption (E _mess ) of the household appliance from the stored data on the temperature profile of the circulating medium of an unloaded Household appliance (degree ₀ ) and a standard-loaded household appliance (degree _N ) and the energy consumption of the household appliance in the unloaded state (E ₀ ) and the norm laden state (E _N ) together with the determined, in particular measured, slope (degree _mess ) the temperature of the circulating medium according to the formula $${\mathrm{e}}_{\mathrm{mess}}={\mathrm{<figure-callout\; id="0"\; label="e"\; filenames="imgf0002.png"\; state="\{\{state\}\}">e</figure-callout>}}_{\mathrm{0}}+\left[\left({\mathrm{e}}_{\mathrm{0}}-{\mathrm{e}}_{\mathrm{N}}\right)/\left({\mathrm{Degree}}_{\mathrm{0}}-{\mathrm{Degree}}_{\mathrm{N}}\right)\right]*\left({\mathrm{Degree}}_{\mathrm{mess}}-{\mathrm{<figure-callout\; id="0"\; label="Degree"\; filenames="imgf0002.png"\; state="\{\{state\}\}">Degree</figure-callout>}}_{\mathrm{0}}\right)$$

be calculated without an external evaluation would be necessary. The energy consumption determined in this way can preferably be visually output via a display, for example an LED display, in each case updated for the respective conditions. Of course, other display options can be used. In particular, the display can also be acoustically in addition to or independent of a visual information output.

In order to determine the most accurate possible slope of the temperature curve can be measured during a rising and / or falling phase of the temperature of the circulating medium these timed clocked. In particular, the time between measurements is less than half a second to achieve high accuracy.

For the temperature measurement, according to an advantageous development of the invention, at least one permanently installed sensor can be provided, which, for example, flows around the rinsing liquor.

For high accuracy and error correction, the determination of the energy consumption during an operating cycle can take place several times. If necessary, the display can be updated.

In addition to the dependence on the load or possibly also independently of this, further data such as ambient and / or water inlet temperature, and / or Spülgutart can be included in the determination of energy consumption.

By rinsing liquor or rinsing liquor fluid is meant in particular clear or circulating clear or clean water or water, which is mixed with rinsing agent, rinse aid, and / or other additives, and / or dirt particles - depending on the phase of the respective expiring rinse cycle of a selected dishwashing program can. It is possible, for example by means of one or more water heaters, to heat the rinsing liquor in different phases of the program sequence to a temperature desired for the respective phase. The respective phase is preferably accompanied by a corresponding partial rinse cycle of the respectively running rinse cycle.

The invention relates to a method for determining an energy consumption of a water-conducting household appliance, in particular a dishwasher or washing machine, wherein the domestic appliance is run during operation of a heatable and / or coolable circulating medium, in particular with Spülflottenflüssigkeit, which is characterized in that in at least one heating - And / or cooling phase of the circulating medium whose actual temperature profile determined over time and is used as an input date to determine an energy consumption.

In particular, it may be expedient if the actual temperature profile ascertained or determined over at least one heating and / or cooling phase of the circulating medium over time is compared with a reference temperature profile, in particular a standardized temperature profile, over time. As a result, an input variable for determining the actual energy consumption of the household appliance can be derived by a simple relative measurement. For this purpose, the deviation, in particular the difference or the quotient between the determined, in particular measured temperature profile and the reference temperature profile is determined by the evaluation and / or control unit as a deviation parameter and as an input for determining or determining the current energy consumption of the household appliance used.

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

The above-explained and / or reproduced in the subclaims advantageous embodiments and further developments of the invention can be used individually or else in any combination with each other in the household appliance according to the invention for use.

The invention and its advantageous developments are explained in more detail with reference to drawings.

Fig. 1

eine Geschirrspülmaschine als vorteilhafte Ausbildung eines erfindungsgemäßen wasserführenden Haushaltsgeräts in einer beispielhaften, schematischen Seitenansicht,

Fig. 2

ein beispielhaftes Diagramm eines zeitaufgelösten Ist-Temperaturverlaufs mit zwei Referenz-Temperaturverläufen des Umlaufmediums des wasserführenden Haushaltsgeräts nach Figur 1 innerhalb eines Programmablaufs,

Fig. 3

eine beispielhafte Darstellung der Abhängigkeit des tatsächlichen Energieverbrauchs in Abhängigkeit der Beladung einer Geschirrspülmaschine, insbesondere Masse des in deren Spülbehälter jeweilig eingebrachten Spülguts, und

Fig. 4

eine beispielhafte Darstellung der Abhängigkeit des ermittelten Temperaturgradienten eines linearen Phasenabschnitts des gemessenen Ist-Temperaturverlaufs des Umlaufmediums der Geschirrspülmaschine von Figur 1 von der Beladung einer Geschirrspülmaschine, insbesondere Masse des in deren Spülbehälter jeweilig eingebrachten Spülguts.

Each show schematically:

Fig. 1

a dishwasher as an advantageous embodiment of a water-conducting domestic appliance according to the invention in an exemplary, schematic side view,

Fig. 2

an exemplary diagram of a time-resolved actual temperature profile with two reference temperature curves of the circulating medium of the water-conducting household appliance according to FIG. 1 within a program sequence,

Fig. 3

an exemplary representation of the dependence of the actual energy consumption as a function of the loading of a dishwasher, in particular mass of in their rinsing respectively introduced introduced items, and

Fig. 4

an exemplary representation of the dependence of the determined temperature gradient of a linear phase portion of the measured actual temperature profile of the circulating medium of the dishwasher of FIG. 1 from the loading of a dishwashing machine, in particular the mass of the items to be washed introduced into their washing containers.

Elements with the same function and mode of operation are each provided with the same reference numerals in the figures.

This in FIG. 1 illustrated water-conducting household appliance is shown here by way of example as a dishwasher. This can be designed as a built-in device or as a stand-alone device. A washing machine can also be designed according to the invention.

The dishwasher 1 shown here comprises a washing container 2 for receiving items to be cleaned, such as dishes, glasses, cutlery, cooking utensils or the like, wherein the washing compartment 2 can be closed by a front door 3. The closed door position is in FIG. 1 shown.

Here, by way of example, in the washing container 2, an upper dish rack 4 and a lower dish rack 5 are provided, in which items can be kept, each with spray arms 6, 7 with a Spülflottenflüssigkeit S such. B. fresh water FW can be acted upon.

The dishwasher 1 further comprises a supply device 8 for fresh water FW, can be introduced via the supplied fresh water from outside FW in the washing compartment 2. The water from the washing container 2 collects due to its gravity as Spülflottenflüssigkeit S in a collecting pot or pump sump 9, which is in the lower part of the washing compartment 2 as a recess in the bottom 17.

The collecting pot 9 is followed by a circulating pump 10, by means of which the rinsing liquor or rinsing liquor liquid S can be pumped out of the collecting pot 9 via a heater 11, for example a water heater, to a water distributor 12 during a circulation phase of a rinse cycle. By means of the water switch 12, the supply line to the rotatably mounted, lower spray arm 7 and / or the supply line to the upper, rotatably mounted spray arm 6 can be supplied selectively or together with Spülflottenflüssigkeit.

By means of the heating 11, the rinsing liquor can be heated differently in different phases or time segments of a program sequence of a selected dishwasher program. According to FIG. 2 is shown that the Spülflottenflüssigkeit S such. B. introduced fresh water FW first in a first heating phase or during a first time period P1, such. B. in the cleaning cycle, from an inlet temperature of about 20 ° C to a temperature of about 50 ° C, is heated. Later, such. B. in the rinse cycle, a more extensive, even higher heating in a second heating phase or during a second time period P2 can be seen. The values and phase sequences can vary considerably depending on the program sequence and are therefore only an example here. The heater 11 may be controllable by an evaluation and / or control unit, in particular arithmetic unit R, in order to be able to set the respective desired temperature of the rinsing bath S in the program sequence. In addition, at least one temperature sensor TS for measuring the actually reached temperature of the rinsing solution S is provided. This is here firmly in a line of the liquid circulation of the Dishwasher installed and flows directly from the wash liquor S behind its passage through the heater 11. For example, can be provided as a sensor TS, a temperature-sensitive resistor, such as an NTC. The arrangement possibilities for the at least one sensor TS are manifold. In particular, it may optionally be circulated on a carrier or in a finger arrangement of the rinsing liquor S.

The downstream of the circulation pump 11 water distributor 12 has here three outputs, of which a first to the upper, in particular rotatably mounted spray arm 6 and a second to the lower, in particular rotatably mounted spray arm 7 leads. The water diverter 12 is controllable or regulatable in such a way that the rinsing liquor liquid S conveyed by the circulating pump 10 can be used selectively when rinsing dishes, i. selectively through one of the spray arms 6, 7 or by both spray arms can be introduced simultaneously into the washing compartment 2, to clean there the items to be washed.

Next, a third output of the water gate 12 are controlled so that the wash liquor S can be pumped through this exit in a fleet storage tank 13 as a buffer.

In order to remove unnecessary rinse S from the washing tank 2, a wastewater or drain pump 14 is provided, which is connected on the suction side with the collecting pot 9 and the output side with a waste water connection 15, so that during a pumping out a rinse cycle rinse S as wastewater AW can be pumped to the outside.

The above-mentioned collecting pot 9 for washing liquor S is additionally provided with at least one screening device 16. Coarse particles, such as scraps of food or even dropped toothpicks, cutlery or the like, which could damage the recirculation pump 10, the suds pump 14 or its supply lines and / or drains, are retained therein. In a fine or microsieve 20 also other ingredients that could soil the dishes again on further circulation, removed from the circulation.

The sieve device 16 is embedded in the bottom 17 of the washing container 2. It first comprises a flat screen bottom portion 18 which is used as part of the bottom 17 of the washing container 2 more or less flush or slightly offset down in this and provided with a plurality of openings. Rinsing liquor or rinsing liquor liquid S, which has passed through this sieve bottom region 18, can be sucked directly by the circulating pump 10. Furthermore, the sieve bottom region 18 is preferably provided with a slope in such a way that it slopes down in the direction of a central inlet opening 19 of a fine or micro sieve 20, which forms a further part of the sieve device 16. This is held below the plane of extent of the sieve bottom region 18. From above, the proportion of wash liquor S, which has not drained down through the perforations of the sieve bottom region 18, can enter into the inlet opening 19 of the fine or microsieve 20, into which a basket or similar coarse sieve 21 may additionally be suspended.

The inlet opening 19 opens at the bottom into a space surrounded by screen surfaces to the sides within the fine or microsieve 20. Further downwards, this space opens into the sewage connection pipe 15 in the direction of the drain pump 14. Laterally, in particular radially outside of the screen surfaces, there is the at least one suction opening of the circulation pump 10. In the exemplary embodiment, two intake openings are provided symmetrically to one another. Of course, a single outlet opening of the circulation pump can already be sufficient.

The dishwasher 1 is therefore by the mechanism described in its operation with a controlled to a certain upper temperature and / or defined coolable circulating medium, in particular Spülflottenflüssigkeit, such as fresh water or rinsing agent, rinse aid, other additives, and / or dirt added water, Mistake. In at least one of the heating phases P1 or cooling phases P2 of the rinsing liquor liquid S, the actual temperature profile in the rinsing liquor liquid S over the time t can be determined, in particular measurable, and used as an input variable or as a so-called input date for calculating an energy consumption. In particular, a defined, increasing temperature phase, which typically runs at about 2 K / minute, and / or a falling temperature phase can be used. In the FIG. 2 an exemplary actual temperature profile is shown in dashed lines and denoted by TM.

For the further calculation, the measured instantaneous values of the actual temperature profile TM of the rinsing liquor liquid S to an evaluation and / or control unit, such as. B. arithmetic unit, R forwarded and evaluated there. Degree _measured for determining a gradient is a measurement of at least two temperature values, such as T1, T2, spaced at interval .DELTA.t time from each other, advantageously. If the two actual temperature values T1, T2 are taken from an approximately linear section of the actual temperature profile TM, then the gradient of the straight line slope corresponds to this approximately linear section of the actual temperature profile TM. In the case when the rinse liquor liquid is heated for a partial rinse of a rinse cycle, this can be, for example, a rising straight line segment P1, for example during the heating phase of the rinse cycle or rinse cycle of the rinse cycle of a selected dishwasher program. On the other hand, this may also be a sloping straight line section P2 during a cooling phase of the rinsing liquor liquid, for example after the end of a heating phase of the cleaning cycle and / or rinse cycle. In each case, the difference ΔT of two different temperature values T1, T2 is formed. The gradient grade _measured is then obtained from the ratio between the temperature difference .DELTA.T and the time interval At of the two temperature values T1, T2.

In particular, a clocked measurement of several temperature values in the approximately linearly increasing or decreasing temperature phases P1, P2 is possible, with a close timing of the temperature measurement is desirable in order to obtain a high accuracy. For example, the time between individual temperature measurements may be shorter than one second. In particular, an average value may in each case be formed in each case from a plurality of determined gradients in the evaluation and / or control unit R per during a heating phase P1 linearly rising or per cooling phase P2 linearly sloping actual temperature curve TM.

In the evaluation and / or control unit R, a gradient of the time-resolved temperature profile TM (t) can generally be determined from the measured time and temperature data. This slope is referred to in the embodiment as a degree _measuring a linearly rising (or falling) temperature profile. Next are in the evaluation and / or control unit R Data on the temperature profile of a reference dishwasher in the unloaded state and / or the temperature profile of a reference dishwasher in the standard loading state deposited. In general, therefore, at least one reference temperature profile of a reference dishwasher is stored. The reference dishwashing machine can also be formed by the dishwasher in the non-loading state and in the standard loading state itself, whose actual energy consumption is to be determined. The associated reference temperature profiles can in particular be determined at the factory and stored in a memory unit of the evaluation and / or control unit R. In particular, the gradient is degree _{0 of} a phase P1 of an approximately linearly rising temperature profile and / or the gradient grad _{N of} a phase P2 of an approximately linearly decreasing temperature profile of a reference dishwasher in the non-loading, ie empty state, and standard loading state in the evaluation and / or control unit R, in particular arithmetic unit, deposited. In the FIG. 2 is the reference temperature curve T ₀ dotted for the unloaded dishwasher and the reference temperature curve T _N for the standard-loaded dishwasher dash-dotted sections drawn during the phase P1 and the phase P2 with. The phase P1 and the phase P2 of the determined actual temperature curve are thus in summary summarized in the evaluation and / or control unit R reference temperature curves T ₀ and T _N associated with a reference dishwasher in the unloaded state and the norm laden state during the same warm-up and / or cooling phase.

• grad = grad₀ + ((grad₀ - grand₁₃)/ (0-13)) MG, wobei die Anzahl N der Maßgedecke bei normbeladenen Zustand der Geschirrspülmaschine gleich N=13 gewählt ist.

Denn bei höherer Beladung ist in der Regel die Speichermasse des Spülguts im Spülbehälter 2 der Geschirrspülmaschine 1 größer als im leeren Zustand des Spülbehälters, d. h. wenn in diesen kein Spülgut eingestellt ist.In this way, data relating to at least one measured temperature profile TM can be compared with data relating to a temperature profile T _{0 of} an unloaded reference dishwasher and / or a standard-laden reference dishwasher. It shows how in FIG. 4 is shown that with increasing loading of the Geschirrspülmaschne 1 (in FIG. 4 in place settings (MG) indicated - here are up to 13 place settings possible) decreases the gradient of a temperature increase, at higher loading of the dishwasher 1 with dishes the heating of the wash liquor S to a target temperature so slower than at a lower load. In particular, this results in the following relationship for depending on increasing load with items to be washed and the associated increase in load mass (here expressed in number MG of place settings) an approximately linearly decreasing gradient grad:

• degree = grad ₀ + ((grad ₀ - grand ₁₃ ) / (0-13)) MG, where the number N of place settings is selected equal to N = 13 when the dishwasher is loaded with standard.

Because at higher load the storage mass of the items to be washed in the washing container 2 of the dishwasher 1 is usually greater than in the empty state of the washing container, ie if no items to be washed is set in this.

berechenbar ist.Next in the evaluation and / or control unit R, in particular arithmetic unit, the energy consumption of the household appliance in the unloaded state (E ₀ ) and in the standard loaded state (E _N ) deposited so that then in total in the evaluation and / or control unit R of actual energy consumption E _{mess of} the dishwasher 1 from the stored data for the reference temperature profile T ₀ , in particular the gradient degree _{0 of} the reference temperature profile T ₀ , an unloaded reference dishwasher and / or from the stored data for the reference temperature profile T _N , in particular the gradient of the degree _N of the reference temperature course T _N, a standard laden dishwasher and energy consumption e ₀ of the dishwasher in the unloaded state as well as the energy consumption e _N in the standard loaded state, together with the measured slope degree _measuring the temperature T according to the formula $${\mathrm{e}}_{\mathrm{mess}}={\mathrm{<figure-callout\; id="0"\; label="e"\; filenames="imgf0002.png"\; state="\{\{state\}\}">e</figure-callout>}}_{\mathrm{0}}+\left[\left({\mathrm{e}}_{\mathrm{0}}-{\mathrm{e}}_{\mathrm{N}}\right)/\left({\mathrm{Degree}}_{\mathrm{0}}-{\mathrm{Degree}}_{\mathrm{N}}\right)\right]*\left({\mathrm{Degree}}_{\mathrm{mess}}-{\mathrm{<figure-callout\; id="0"\; label="Degree"\; filenames="imgf0002.png"\; state="\{\{state\}\}">Degree</figure-callout>}}_{\mathrm{0}}\right)$$

is calculable.

As in FIG. 3 can be seen, the energy consumption E increases with the load, ie with the total mass of dishwasher detergent set in the washing container 1 - here again in Maßgewecken (MG) specified - approximately linearly according to the relationship E = E ₀ + K MG on; it is thus substantially proportional to the load of the household appliance 1, measured in place settings MG. K is a proportionality factor. E ₀ is the energy consumption in the unloaded state of the dishwasher.

The household appliance 1 very advantageously comprises an indication of the energy consumption determined in the respective current operation and thus taking into account the actual circumstances, for example an LED display and / or also an acoustic announcement. The customer receives thus more accurate information of his device 1 under actual Conditions as they occur during operation. Of course, other information displays are available.

Also, the determination of the energy consumption during an operating cycle 'may take place several times and include an update or correction of the display.

In order to increase the accuracy, further data such as ambient and / or water inlet temperature may be included in the determination of the energy consumption, for example by further temperature measurement sensors in these areas. These additional data can be included in the calculation formula to refine the energy calculation. Also, if necessary, the surface of the dishes and / or the Spülgutart example. be determined by a water measurement and then also as a correction factor in the o. g. Incorporate calculation formula.

Also, in order to determine an energy consumption of a water-conducting household appliance 1, in particular a dishwasher or washing machine, wherein the household appliance 1 during operation of a heatable and / or coolable circulating medium, in particular rinsing liquor liquid, is passed, wherein in at least one heating and / or cooling phase of the circulating medium whose actual temperature profile is measured over time and compared with at least one reference temperature profile over time and their deviation, in particular their difference or their quotient, are used by an evaluation and / or control unit, in particular arithmetic unit, to calculate an energy consumption. For this purpose, it may be particularly expedient if the deviation between the measured temperature profile and the at least one reference temperature profile is determined by the evaluation and / or control unit and used as an input for determining the current energy consumption E of the household appliance. <B> LIST OF REFERENCES: </ b> 1 Dishwasher, 2 rinse tank, Degree gradient 3 Door, degree ₀ Gradient with unloaded household appliance 4 Dish rack, 5 Dish rack, degree _N Gradient at standard loaded household appliance 6 spray arm, 7 spray arm, degree _mess determined gradient at actual load state of the household appliance 8th Feeder 9 Collecting pot, 10 circulation pump, K proportionality 11 Heater, FW Fresh water, 12 Water distributor, S rinsing, 13 Fleet memory P1 Phase of linear heating, 14 Drain pump, P2 Phase of linear cooling, 15 Sewage Cable, R Evaluation and / or control unit 16 screening, T ₀ Temperature curve with unloaded household appliance 17 Ground, 18 Siebbodenbereich, 19 Inlet opening, T _N Temperature curve for standard-loaded household appliance 20 Fine or microsieve, 21 coarse screen, TM Actual temperature curve e current actual energy consumption .DELTA.T Temperature difference E0 Energy consumption in the unloaded state of the household appliance .delta.t lag T1, T2 two different tempratures E _N Energy consumption in norm laden state of the household appliance MG place setting N Number of place settings for standard load

Claims (13)

1. Method for determining and displaying an energy consumption of a water-conducting household appliance (1), in particular a dishwasher or washing machine, wherein a heatable circulating medium (S), in particular a washing liquor liquid, passes through the household appliance (1) during operation, wherein the actual temperature curve of the circulating medium can be determined over time in at least one heating and/or cooling phase (P1; P2) of the circulating medium and is used as input data to determine an energy consumption, characterised in that a rise (grad_mess) in a phase (P1, P2) of an essentially linearly rising and/or falling actual temperature curve (TM) of the circulating medium (S) is determined and that the determined energy consumption is displayed.
2. Method according to claim 1, characterised in that a gradient of the time-resolved actual temperature curve (TM) of the circulating medium (S) is determined.
3. Method according to one of claims 1 or 2, characterised in that data for at least one determined, in particular measured, actual temperature curve (TM) of the circulating medium (S) is compared with data for at least one reference temperature curve (T₀, T_N), in particular for at least one temperature curve (T₀) of an unloaded household appliance and/or for at least one temperature curve (T_N) of a standardly loaded appliance.
4. Method according to one of claims 1 to 3, characterised in that in an evaluation and/or control unit, in particular an arithmetic unit (R), data is stored for at least one reference temperature curve (T₀, T_N), in particular for at least one temperature curve (T₀) of the circulating medium (S) of an unloaded household appliance (1) and/or for at least one temperature curve (T_N) of the circulating medium (S) of a standardly loaded appliance.
5. Method according to claim 4, characterised in that the gradient of a phase (P1, P2) of an essentially linearly rising and/or falling reference temperature curve (T₀, T_N) of the circulating medium (S), in particular an essentially linearly rising and/or falling reference temperature curve (T₀, T_N) of an unloaded household appliance (grad₀) and/or of a standardly loaded household appliance (grad_N), is or are stored in the evaluation and/or control unit, in particular the arithmetic unit (R).
6. Method according to one of claims 4 or 5, characterised in that in the evaluation and/or control unit, in particular the arithmetic unit (R), the energy consumption of the household appliance (1) is or are stored in a reference state, in particular an unloaded state (E₀) and/or in the standardly loaded state (E_N).
7. Method according to one of claims 4 to 6, characterised in that in the evaluation and/or control unit, in particular the arithmetic unit (R), the actual energy consumption E_mess of the household appliance (1) is calculated from the stored data for the temperature curve of the circulating medium (S) of an unloaded household appliance (grad₀) and a standardly loaded household appliance (grad_N) and for the energy consumption of the household appliance in the unloaded state (E₀) and in the standardly loaded state (E_N) together with the determined rise (grad_mess) of the actual temperature curve (TM) in accordance with the formula $${\mathrm{E}}_{\mathrm{mess}}={\mathrm{E}}_{\mathrm{0}}+\left[\left({\mathrm{E}}_{\mathrm{0}}-{\mathrm{E}}_{\mathrm{N}}\right)/\left({\mathrm{grad}}_{\mathrm{0}}-{\mathrm{grad}}_{\mathrm{N}}\right)\right]*\left({\mathrm{grad}}_{\mathrm{mess}}-{\mathrm{grad}}_{\mathrm{0}}\right)\mathrm{.}$$

   
8. Method according to one of the preceding claims, characterised in that during a rising and/or falling phase (P1; P2) of the actual temperature curve (TM) of the circulating medium (S) the temperature is measured in a time-clocked manner.
9. Method according to claim 8, characterised in that the time between the measurements is less than half a second.
10. Method according to one of the preceding claims, characterised in that the determination, in particular measurement, of the temperature of the circulating medium (S) is carried out via at least one permanently installed sensor (TS).
11. Method according to one of the preceding claims, characterised in that the energy consumption is determined multiple times during an operating cycle and if necessary the display is updated.
12. Method according to one of the preceding claims, characterised in that further data, in particular an ambient temperature and/or a water inlet temperature, is taken into consideration for the determination of the energy consumption.
13. Method according to one of the preceding claims, characterised in that the difference and/or the quotient between the determined, in particular measured, temperature curve (TM) and a reference temperature curve (T₀, T_N) is determined by an evaluation and/or control unit (R) and is used as an input variable to determine the current energy consumption of the household appliance.

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