EP3879190A1 - Domestic appliance, in particular a water heater, and associated method - Google Patents

Abstract

The present invention relates to a method for operating a domestic technology device, in particular a hot water storage tank, and an associated domestic technology device. The domestic technology device is designed for communication with an energy supply company, EVU, and for communication with a user's terminal device, in particular a smartphone. The method comprises the following steps: Operating the building technology device at a reduced setpoint temperature (T _Red), the reduced setpoint temperature (T _Red) being determined for the user on the basis of a learning function, if the utility company does not communicate any need for energy consumption to the building services device, receiving a demand signal from the utility company and operating the building technology device at an increased setpoint temperature, the increased setpoint temperature being higher than the reduced setpoint temperature (T _Red).

Description

House technology devices are known. For example, electrically operated water heaters are used to provide heated drinking water. The decentralized supply can take place by means of an instantaneous water heater, the central supply usually takes place with a water storage tank. The drinking water is heated and stored in a sufficiently large, preferably thermally insulated container. The water in the container can be heated by means of a heating element and / or by a heat pump.

Such household appliances are known in which, depending on the operating mode, a heat pump and an electrical heating element heats the water either simultaneously or alternately. For example, heated drinking water storage tanks produce thermal losses even when no water is being drawn. This loss is undesirable and is referred to as a loss of readiness or "stand-by loss".

For reasons of space and for reasons of energy saving, there are different sizes of drinking water storage tanks of this type due to different consumption quantities, since the standby losses also depend on the volume of the stored water.

The standby losses of a household technology device such as an electrically heated drinking water storage tank depend on the specific heat capacity of the drinking water, among other things, on its volume, its surface area, the heat retention capacity of the storage tank insulation and the temperature difference between the storage tank water and the storage room where the storage tank is installed.

The temperature at which heated drinking water is used for showering or washing hands is usually around 40-43 ° C. If the water temperature is set higher than 43 ° C on a thermostat of the building services device, the heated drinking water can be mixed with cold water in a mixer tap. This allows Depending on the temperature of the cold water, the useful amount of the water heated in the building services device can be increased so that more water is available than the existing storage volume.

In the course of attempts to save energy, attempts were made to reduce the heat losses of heated water storage tanks by improving the heat retention capacity of the insulation. It is also known to use automatic user analysis by means of sensors and self-learning electronics integrated in the water tank, known as "smart electronics", to minimize the temperature difference between the installation room and the storage water. This is done in particular in such a way that just enough usable water is available at all times, but the heat losses are gradually reduced by a targeted lowering of the hot water temperature on the water temperature controller, which saves energy.

However, depending on how far the water temperature is lowered, there may be a loss of comfort, especially if the user behavior changes unexpectedly.

Furthermore, household appliances are known which can be controlled by power supply companies, called EVU, in order to consume electricity at the request of the EVU. With the electricity it consumes, the home automation device can, for example, heat a thermal store, such as the water store of a water heater.

In addition to meeting the heat consumer’s comfort requirements, this also helps to stabilize the electricity network, which the utility company rewards the customer with, for example, a favorable electricity tariff. Here it is in the interest of the EVU, for example by granting night electricity tariffs, to compensate for the different electricity consumption between day and night in order to guarantee uniform energy generation with a power plant output that is as constant as possible. Since the closing and closing of power plants is expensive and the expansion of renewable energy is a declared goal, there will increasingly be a strongly fluctuating supply of electrical energy in the mix of central energy generation, in particular through conventional power plants, and renewable generators, in particular photovoltaics and wind energy. This requires various measures for energy storage in order to compensate for the fluctuating supply of electricity, which has a stabilizing influence on the grids. Against this background, it was an object of the present invention to specify a domestic technology device and a method for controlling such a domestic technology device, which at the same time provides a network-stabilizing contribution, but nevertheless avoids loss of comfort for the user.

The object is achieved by a method for operating a domestic technology device, in particular a hot water storage tank, according to claim 1 and a domestic technology device according to claim 8.

According to the invention, in particular a method for operating a domestic technology device, in particular a hot water storage tank, is proposed, the domestic technology device being designed for communication with an energy supply company, EVU, and for communication with a user's terminal device, in particular a smartphone. The method has the following steps: operating the domestic technology appliance at a reduced setpoint temperature, the reduced setpoint temperature being determined for the user on the basis of a learning function when the utility company does not communicate any need for energy consumption to the domestic technology appliance; Receiving a demand signal from the utility company and operating the building services appliance at an increased setpoint temperature, the increased setpoint temperature being higher than the reduced setpoint temperature.

The method according to the invention enables the home automation device to be remotely controlled by an EVU, i.e. it contributes to network stabilization, and still enables the lowest possible energy consumption, since a setpoint dependent on user behavior is always used when the EVU signals no need to close the device heat. In this way, user comfort is guaranteed in every case, and energy consumption and the costs associated with the operation of the home automation device are reduced.

The method preferably further comprises the following steps: Checking whether a mixer fitting is present and, in the event that a mixer fitting is present, enabling the increased setpoint temperature to a value greater than 60 ° C., in particular greater than 70 ° C. and particularly preferred at least 85 ° C.

This ensures that there is no risk of scalding due to excessively high temperatures, for example in the water tank, in particular when there is no mixer fitting. In the case of an elevated temperature, for example the If there is water in the water storage tank, a corresponding message can be output to the user's terminal device. The setpoint temperature is set depending on the needs of the utility company.

The setpoint temperature is preferably a time-variable setpoint temperature that is adapted to user behavior.

In other words, regularly recurring tapping processes by the user, for example morning showering, are recognized and the amount of hot water or energy required for the regularly recurring tapping processes is kept available. The setpoint temperature and thus also the standby losses resulting from the setpoint temperature can be minimized in this way.

The method preferably further comprises the following steps before the step of operating the domestic technology device at the reduced setpoint temperature: putting the domestic technology device into operation, with the start-up being followed by a learning function with a predefined period of time, for example three days, the learning function for determining a time-resolved user behavior is designed to determine a reduced or increased setpoint temperature after the end of the predefined time period.

In the event that there is an increased demand for energy, that is to say that the setpoint temperature cannot be reduced to a reduced setpoint temperature, an increased setpoint temperature is defined as the minimum setpoint temperature. This value of the minimum setpoint temperature is not fallen below, even if the house technology device is remote-controlled by the utility company.

The method preferably enables at least one, preferably all, of the following functions during the operation of the domestic technology device: a) Minimizing the standby heat consumption by temporarily lowering the hot water temperature, b) Detecting a longer absence of the user and operating the domestic technology device in reduced mode with a reduced hot water temperature Detection of an absence, with the lowering mode being terminated, in particular if the user falls below a predefined distance from the building technology device, c) performing a consumption-dependent legionella function and d) detecting calcification of the building technology device.

All of these functions serve to optimize energy consumption and / or to increase the comfort of the user.

The method preferably requires a confirmation on the user's terminal device before activating each of the functions. This prevents the user from losing control of the operation of his home automation device, i.e. feeling incapacitated by the control.

Operation of the domestic technology device under the control of the EVU, in particular after receipt of the demand signal, is preferably overwritten by the terminal device and the user.

According to the invention, a domestic technology appliance, in particular a hot water storage tank, with a controller is also proposed, the controller being designed to carry out the method according to the invention.

The domestic technology device preferably comprises two interfaces for connecting communication modules, one of the communication modules being designed for communication with an EVU and the other of the communication modules being designed for communication with a terminal of a user, in particular a smartphone, the controller for automatic detection of the connection of a communication module is trained.

Several versions of the domestic technology appliance are thus possible, namely standard versions that do not include a communication module and those that include one or both of the communication modules. Depending on the needs of the user, an optimal home automation device can be selected.

When the connection of a communication module is detected, the controller preferably exchanges data, for example for ad hoc pairing with a terminal of the user and / or information about scalding protection, a minimum setpoint temperature, for example the reduced setpoint temperature, and / or the highest permissible setpoint temperature due to the scald protection, automatically off. In this way it can be avoided that the comfort requirements of the user are unintentionally influenced.

Fig. 1

schematisch und exemplarisch ein Haustechnikgerät,

Fig. 2

schematisch und exemplarisch ein Warmwasser-Temperaturprofil,

Fig. 3

schematisch und exemplarisch ein Flussdiagramm eines Verfahrens,

Fig. 4

schematisch und exemplarisch ein Haustechnikgerät,

Fig. 5

schematisch und exemplarisch und

Fig. 6

schematisch und exemplarisch ein Flussdiagramm eines Verfahrens.

Further advantages and preferred configurations are described below with reference to the accompanying figures. Here show:

Fig. 1

a schematic and exemplary building technology device,

Fig. 2

a schematic and exemplary hot water temperature profile,

Fig. 3

a schematic and exemplary flow diagram of a method,

Fig. 4

a schematic and exemplary building technology device,

Fig. 5

schematic and exemplary and

Fig. 6

schematically and by way of example a flowchart of a method.

Fig. 1 shows schematically and by way of example a domestic technology device 100 configured as a water heater. The domestic technology device 100 has a water tank 1 with a warm water outlet pipe 2 and a cold water inlet pipe 3. A heating device 4 heats domestic water in the water tank 1.

The heating device 4, which comprises, for example, an electrical heating element or a heat pump, is connected to a controller 5 by a line 4a, the connection also being wireless in other embodiments.

The control 5, which is also referred to as electronics, is optionally in conductive connection with a display 6 and a control panel 7. A protocol or data conversion module 11, which in turn communicates with a radio module 12, is preferably connected to the controller 5. The data conversion module 11 translates the data received between the controller 5 and radio module 12 into data that can be read by the controller 5 and vice versa for the data provided by the controller 5 for transmission.

An Internet gateway wirelessly receives information 14, for example from an Internet router 15, and sends this information wirelessly or wired 13 to the Internet router 15.

The sensor system on the domestic technology device 100 preferably consists of the following components: a temperature sensor 8 is attached opposite the mouth of the hot water outlet pipe 2 on the outer tank surface; the dome temperature of the water tank 1 is recorded here.

A sensor 9 is preferably an integral sensor which detects the water temperature in the vertical tank direction, for example by means of an NTC chain. A temperature sensor 10 is mounted opposite the mouth of the cold water inlet pipe 3, also on the outside of the water tank 1, on the surface of the water tank 1.

The heating device 4 is supplied with voltage via the electrical power connection (not shown) and is switched on by the controller 5 or a temperature regulator provided for this purpose when the water is to be reheated. A safety temperature limiter, also not shown, switches off the heating device 4 if the temperature regulator fails. A device for protecting the water tank against corrosion, such as an impressed current anode or a sacrificial anode, is also not shown, but is usually present.

The start of water tapping is preferably detected by means of, for example, the temperature sensor 10, as is known in the prior art. The control 5 preferably determines the thermal energy consumed by the tap for each tapping process. The controller 5 starts a timer when it detects the start of dispensing and adds up the difference amounts of the current energy content determined from the integral sensor signal during the running time of the timer until the integral sensor signal rises again or the gradient of the falling signal changes by a specified amount and the running time of the Timer ends.

A gradient observation to recognize the completion of a dispensing process is particularly useful in standby without reheating. The standby heat loss typical for the water heater as a domestic technology device 100 can also be taken into account in the balancing.

Since, for example, with electrically heated drinking water storage tanks, the heating capacity is usually small compared to the withdrawal capacity, the tapping time is also reliably detected during a reheating period, since the integral sensor signal also falls during reheating as long as the amount of energy withdrawn per unit of time is greater than that supplied in the same unit of time. This is usually the case, except that an unusually small amount of water is withdrawn, ie the tap is only opened very slightly.

This also applies to the case distinction in the case of withdrawals without reheating in standby with adequately insulated water storage. Here, the reduction in the integral sensor signal caused by the usual tapping quantities is significantly greater than the signal reduction which occurs as a result of standby losses.

Provision can be made, in particular when a heating power P _{el is} approximately as great as the extraction capacity, to reduce the heating output P _el during the extraction time. A withdrawn amount of water V is balanced, for example and in simplified form, as shown in the following schemes:
During a standby or standby state, i.e. without reheating by means of the heating device 4: $$V={\displaystyle \sum _{t_1}^{t_2}}\frac{Q_{\mathit{integral}2}-{\mathrm{<figure-callout\; id="1"\; label="Q\; integral"\; filenames="imgf0001.png,imgf0004.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{\mathit{integral}}}{\mathit{cp}\times \left(T_{\mathit{Dom}}-T_{\mathit{KW}}\right)}$$

During post-heating with electrical heating power P _el : $$V={\displaystyle \sum _{t_1}^{t_2}}\frac{Q_{\mathit{integral}2}-{\mathrm{<figure-callout\; id="1"\; label="Q\; integral"\; filenames="imgf0001.png,imgf0004.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{\mathit{integral}}}{\mathit{cp}\times \left(T_{\mathit{Dom}}-T_{\mathit{KW}}\right)}+{\displaystyle \sum _{t_1}^{{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="imgf0001.png,imgf0004.png"\; state="\{\{state\}\}">t</figure-callout>}}_2}}{\mathrm{P.}}_{\mathit{el}}$$

- Qintegral2

aus Signal des als Integralsensor ausgestalteten Temperatursensors 9 berechnete thermische Energie zum Zeitpunkt t₂.

- Qintegral1,

aus Signal des als Integralsensor ausgestalteten Temperatursensors 9 berechnete thermische Energie zum Zeitpunkt t₁.

- cp

spezifische Wärmekapazität des Wassers

- TDom

Mit Temperatursensor 8 ermittelte Wassertemperatur des Doms

- TKW

Mit Temperatursensor 10 ermittelte Wassertemperatur am Kaltwasserzulauf 3

- V

gezapftes Volumen

In simplified terms, a water density of 1000 kg / m ^{3 can be} expected. The parameters of the formulas mean as follows:

- Qintegral2

Thermal energy calculated from the signal of the temperature sensor 9 designed as an integral sensor at time t ₂ .

- Qintegral1,

Thermal energy calculated from the signal of the temperature sensor 9 designed as an integral sensor at time t ₁ .

- cp

specific heat capacity of water

- T-dom

Water temperature of the cathedral determined with temperature sensor 8

- TKW

Water temperature at cold water inlet 3 determined with temperature sensor 10

- V

drawn volume

The specific heat capacity cp, like the tank volume of the water storage tank 1, is stored in the control unit µ ex works as a parameter.

For example, the amount of energy consumed and tapped per day is stored for further processing. The amount of energy drawn can also be resolved in time, for example, stored per minute, 10 minutes, hours, etc., broken down.

The water temperature that can be used by consumers varies slightly from person to person, although a minimum temperature of 42 ° C can be assumed as a good average. For example, it is up to 55 ° C in kitchen applications that require higher temperatures.

Fig. 2 shows schematically and by way of example a typical temperature profile 200 over, for example, a 24 hour day on the horizontal axis. The course of the day of the integral _{sensor temperature T Integral} with a temperature setting of the setpoint of 65 ° C. is shown with a dashed line, and the course of the day with a temperature setting of the setpoint of 55 ° C. is shown with a solid line. In the lower area hatched tapping cycles and non-hatched post-heating cycles are shown.

The useful temperature that is used by way of example is shown horizontally at 42 ° C with dashed lines. You can see in Figure 2 _{How the integral sensor temperature T Integral} develops in the course shown by the dashed line for a starting point at 65 ° C when taps are made in the morning, at noon and in the evening and the device thermostat is set to 65 ° C temperature.

The lowest integral _{sensor temperature T Integral} is set at around 4:00 p.m. at 52.5 ° C. With the 55 ° C setting, the process begins at 55 ° C in the morning and the lowest integral sensor _{temperature T Integral} is set at around 10:00 p.m. at 43 ° C.

The functions described below and preferably carried out by the controller 5 are carried out using the diagram of FIG Fig. 3 , which illustrates the first of the functions, is explained by way of example.

1. Minimizing the standby heat consumption by adapting the hot water temperature to the daily hot water consumption

Fig. 3 schematically shows a flowchart of a method 300, for which the example in Fig. 1 House technology device shown can be designed.

In a step 310, if the user activated a learning function when the device was started up, the system learns the usage behavior over a defined period of time, for example 3 days after start-up, and evaluates a possible decrease or increase in the factory-set hot water temperature T _Default the criteria i) number of daily draw-offs and ii) smallest temperature difference dT _Min between minimum usage temperature and smallest integral sensor temperature.

Until the defined period of time has not ended, the temperature T _Default preset at the factory is used in a step 330, for example.

After the defined period of time has ended, an evaluation is carried out in step 340. The time period Z _Dom , how long the integral sensor temperature was low or high, is also evaluated. A low integral sensor temperature can be defined for the determination of zoom, for example, with T _Dom <0.8 x T _Default .

As a result of the evaluation, a temperature decrease T _red or increase T _{zu is} proposed by determining a calculated temperature value in the controller 5, making it available to the radio module 12 via the protocol converter or the data converter module 11, and in a step 350 via the router 15 in a step 360 is sent to a terminal of the user, for example a smartphone, which it displays in a step 370 together with a saving in a step 380.

In a step 390 the terminal is queried as to whether the proposed changed setpoint should be accepted or not. Depending on the answer, the setpoint value of the temperature is adapted in a step 400 or the method starts from the beginning.

In addition, the costs or the savings are optionally calculated in a step 410 as a function of the level of the proposed temperature value and communicated to the terminal. The amount of the costs / savings results from the decrease / increase of the standby heat consumption, caused by a decrease / increase in the temperature of the storage water. The saving is in a step 420 optionally monetarily, preferably as a multiplication of the energetic value with a currency, energetically, and / or output _{as CO 2.} The saving is calculated relative to the loss of readiness of the factory-set storage tank temperature.

2. Minimization of the standby heat consumption through a temporary lowering of the hot water temperature.

The domestic technology device 100 according to the invention learns over a defined period of time, which, for example, as in function 1 described above, can be three days, at what times of the day and with what frequency a tap takes place. The system suggests a temporary lowering of the hot water temperature via the smartphone app on the terminal 15. If the suggestion is accepted by the user on the terminal 15, the savings made compared to the factory setting are output after a defined period of time, for example, to the terminal 15 or to the display element 6 or both.

If the suggestion has been accepted, the savings compared to the factory setting are output after a defined period of time, preferably on the terminal. By means of a distance signal, the smart phone informs the smart system that the user is approaching the installation location at a preset distance and the lowering mode is ended automatically.

3. Active vacation operation

The system has not detected any tapping over a period of, for example, more than 24 hours, the period of time preferably being adjustable. It then actively sends a request to the terminal as to the period of time over which the temperature of the domestic technology device 100 is to be lowered, and particularly preferably automatically sets a spatial distance signal between the terminal and the domestic technology device 100 to terminate the absence mode to activate the heating. A GPS or similar satellite navigation position of the terminal is preferably used for this. The absence mode is particularly preferably terminated with a disinfection by heating to at least 65 ° C. once. This avoids the risk of legionella or other germs due to the temperature being reduced over a longer period of time.

4. Consumption-dependent legionella function

By evaluating the tapping time, the cold water temperature and the signal from the integral temperature sensor, the system calculates the amount of water withdrawn from the storage tank during a certain period of time, for example daily. If a minimum value, preferably set by the factory, is not reached during the period, the temperature setting is checked. If the temperature of the storage water is permanently set below a specified limit value of 55 ° C, for example, a one-time disinfection heating to 60 ° C or 70 ° C is suggested on the terminal or, depending on the setting, carried out automatically.

In order to include the peripheral pipeline system in the disinfection process, if the user wishes, the disinfection time can be indicated via the end device so that the tapping points of the pipeline system can be opened for disinfection in due time.

It is also possible to temporarily activate a circulation pump by means of a terminal in order to carry out the disinfection when the water temperature in the storage tank 1 is sufficiently high.

In addition to the information on the time of disinfection, a warning about scalding protection can be linked, which is preferably displayed on the terminal. This can further increase the security of use.

5. Calcification indicator

When the home automation device 100 is put into operation, the system asks whether the water in the user's supply area contains lime or not. If the user enters that the water contains lime, a maintenance interval for cleaning the heating device 4 is determined depending on the set hot water temperature and / or the hot water consumption and suggested, for example, on the terminal, for example by means of a smartphone app.

When a safety temperature limiter (not shown) of the domestic technology device 100 is triggered, information is sent to the user of the domestic technology device 100, for example to the terminal, for troubleshooting. The information can indicate descaling.

For this purpose, the heating-up time is preferably determined immediately after start-up during standby operation, taking into account the current cold water inlet temperature and the setpoint value and the current mains voltage, and stored _{as a reference value K integral / min.} Before the value is saved as valid, the electronics check whether water was tapped during the heating-up time or not. All subsequent post-heating in standby mode, ie post-heating during which no water was drawn, is compared with the reference value.

If the reheating time is above a certain value, for example more than 15%, longer than the reference value, a maintenance signal is sent. The longer post-heating time indicates that the heating device 4 is calcifying. Alternatively or additionally, it is possible to measure the temperature of the heating device 4 at a suitable point and to determine the degree of calcification of the heating device 4 from the level of the excess temperature, i.e. the temperature of the heating device 4 compared to the temperature of the water.

For this purpose, too, the reference temperature of the heating device 4 is preferably measured and stored immediately after start-up during standby mode without tapping. A change relative to the reference value is assessed and preferably displayed on the terminal as the degree of calcification.

The functions mentioned can be supplemented by, for example, equipping with a further communication module that exchanges data directly with the operator of the power grid, the energy supply company (EVU), and operates the house technology device 100 remotely.

In Fig. 4 a house technology device 100 is shown, which is equipped with two communication modules. It is of course possible to integrate the communication modules mentioned directly on a main board of the domestic technology device 100.

The communication between the EVU and the domestic technology device 100 is then organized via the data converter module 11a and the radio module 12a with the server of the EVU 15a. The EVU then sends a heat demand signal 14a to the radio module 12a. The radio module 12a then sends a "heating on" or "heating off" signal 13a back to the utility company, for example. It is also possible to inform the RU of the expected duration of the standstill phase

("Heating off") or the expected duration of the heating phase ("Heating on") via a specified data protocol as signal 13a.

One possible structure of communication is in Fig. 5 shown.

In Fig. 5 a communication 510 of the device with the server 15a of an EVU (utility) is shown, while below a communication 520 via a WIFI router 15 and a cloud server 16 to the receiver (terminal 17) is shown. It is also possible for a domestic technology device 100 to be equipped with two communication modules in order to communicate independently of one another with the user (terminal 17, for example smartphone) and the utility company.

It is advantageous if the house technology device 100 notices it as soon as a communication module is connected and independently receives data, e.g. due to ad-hoc pairing with a terminal 17 and / or information about scalding protection, the minimum hot water temperature setpoint and the highest hot water temperature due to the scalding protection. Setpoint values can be exchanged in order not to inadvertently influence the comfort requirements of the user.

A method 600 for operating the domestic technology appliance 100 is described below with the aid of the schematic and exemplary flowchart of FIG Fig. 6 explained.

First of all, the domestic technology device 100 is operated with standard values in a step 605 and it is checked whether the communication module for communication with the terminal 17 is included. If this is not the case, the setting of the domestic technology appliance is carried out in a step 610 via an internal display.

Otherwise it is checked in a step 615 whether the communication module for communication with the EVU is available. If so, it is checked in a step 620 whether a mixer fitting is present. If not, the setting is made in the display in a step 625. If the mixer fitting is present, the maximum hot water temperature setpoint T _max can be set higher in a step 630.

During the configuration or commissioning of the building services appliance 100, specific parameters of the connected hot water distribution system, such as the presence of a central mixer fitting, are therefore set with the parameter "mixer fitting available". communicated to the controller 5 via the integrated display panel 7 and / or the terminal 17. If the controller 5 is informed in step 620 that a central mixer tap is available, the hot water temperature setpoint can be increased up to a maximum of 85 ° C, for example, if the house technology device 100 is remotely controlled by a utility company to provide a lot of heat if the utility company needs it save low electricity tariff.

In step 635, the learned setpoint temperature T _{Red is} obtained. The tariffs for high tariff and low tariff are entered in step 640.

In step 645 it is checked whether heating takes place on the basis of a request from the utility company. In step 650, the running times of the heating device 4 are determined on the basis of the periods of validity of the high tariff / low tariff. The savings made are determined from all the measures in step 655 and preferably made available to the user via the terminal 17.

For the time when the utility company has no demand, the device can therefore be operated on the reduced hot water temperature setpoint T _Red . The reduced hot water temperature setpoint T _Red can be a minimum hot water temperature setpoint determined from the learning function that follows when the device is started up. By entering the different tariffs on the control panel 7 or via the terminal, an accumulated saving compared to a reference tariff can be output from time to time. It is also possible to issue a scald warning if a certain water temperature is exceeded. Steps 660 to 685 essentially correspond to steps 340 to 420 for the case that an existing terminal device was detected in step 660.

Claims (10)

A method for operating a domestic technology device (100), in particular a hot water storage tank, wherein the domestic technology device (100) is designed for communication with an energy supply company (15a) and for communication with a terminal device (17) of a user, in particular a smartphone,
the method comprising the following steps: - Operating the domestic technology device (100) at a reduced setpoint temperature (T _Red ), the reduced setpoint temperature (T _Red ) being determined for the user on the basis of a learning function if the EVU (15a) does not communicate any need for energy consumption to the domestic technology device (100) , - Receiving a demand signal from the EVU (15a) and operating the house technology device (100) at an increased setpoint temperature, the increased setpoint temperature being higher than the reduced setpoint temperature (T _Red ). The method of claim 1, wherein the method further comprises: - Check whether a mixer tap is available, and - In the event that a mixer fitting is present, enable the increased setpoint temperature to rise to a value greater than 60 ° C, in particular greater than 70 ° C and particularly preferably at least 85 ° C. Method according to one of the preceding claims, wherein the setpoint temperature is a time-variable setpoint temperature that is adapted to user behavior. Method according to one of the preceding claims, wherein the method further comprises before the step of operating the domestic technology device (100) at the reduced setpoint temperature (T _Red): - Commissioning of the house technology device (T _Red ), the commissioning being followed by a learning function with a predefined period of time, for example three days, the learning function being designed to determine user behavior resolved over time, - Determination of a reduced or increased setpoint temperature after completion of the predefined period. Method according to one of the preceding claims, wherein the method enables at least one, preferably all, of the following functions during the operation of the domestic technology device: - Minimization of the standby heat consumption by temporarily lowering the hot water temperature, - Detection of a longer absence of the user and operation of the domestic technology device (100) in a reduced mode with reduced hot water temperature when an absence is detected, with the reduced mode being terminated, in particular if the user falls below a predefined distance from the domestic technology device (100), - Carrying out a consumption-dependent legionella function and - Detecting calcification of the building services device (100). Method according to claim 5, wherein the method requires a confirmation on the terminal device (17) of the user before activating each of the functions. Method according to one of the preceding claims, wherein an operation of the domestic technology device (100) under the control of the EVU (15a), in particular after receipt of the demand signal, is overwritten by the terminal (17) and the user. House technology device (100), in particular hot water storage tank, with a controller (5), the controller (5) being designed to carry out the method according to one of the preceding claims. House technology device (100) according to claim 8, wherein the house technology device (100) has two interfaces for connecting communication modules (11, 12; 11a, 12a), one of the communication modules for communication with an EVU (15a) and the other of the communication modules for communication with a terminal device (17) of a user, in particular a smartphone, wherein the controller (5) is preferably designed for automatic detection of the connection of a communication module. House technology device (100) according to claim 9, wherein the controller upon detection of the connection of a communication module data, for example for an ad hoc pairing with a terminal of the user and / or information about a scalding protection, a minimum setpoint temperature, for example the reduced setpoint temperature, and / or the Highest permissible setpoint temperature due to the scalding protection, automatically exchanged.

Images