CN112611112B - Method and device for predicting remaining bathable time length of electric water heater when water is not used - Google Patents
Method and device for predicting remaining bathable time length of electric water heater when water is not used Download PDFInfo
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- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
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Abstract
The invention discloses a method and a device for predicting the remaining bathable time length when an electric water heater is not used, which calculate the heat quantity in the electric water heater according to the inner container volume, the hot water output rate, the detected water inlet temperature and the inner container temperature of the electric water heater when the electric water heater is in the non-water state, acquire the historical consumed heat quantity in unit time corresponding to the current system time of the electric water heater, calculate to acquire the heating increased heat quantity in unit time if the electric water heater is in the heating state, and finally calculate to acquire the remaining bathable time length of the electric water heater according to the heat quantity in the electric water heater, the historical consumed heat quantity in unit time and the heating increased heat quantity in unit time, thereby reducing the environmental influence when the electric water heater is in the non-water state and improving the prediction accuracy rate of the remaining bathable time length when the electric water heater is not used.
Description
Technical Field
The invention relates to the technical field of electric water heaters, in particular to a method and a device for predicting the remaining bath time when an electric water heater is not used.
Background
The residual bathing time forecasting function of the water storage type electric water heater has important significance for a user to use the water heater, provides convenience for bathing, avoids the problem of poor user experience caused by the fact that no hot water exists in the middle of bathing, is an important measure for saving energy for a customer by forecasting the residual bathing time to supply a hot water discharging system, and is also an energy-saving and intelligent requirement of the water storage type electric water heater. The water storage type electric water heater residual bathing time forecasting related technology, large brand merchants of hail, Wanjiale and America and some important scientific research institutions have research, but the existing researched scheme is usually used for forecasting the residual bathing time by acquiring related parameters only when the electric water heater is used for water. For example, in the chinese patent "a method for predicting remaining bath time of a water storage type electric water heater" (published 2019.03.01, publication No. CN106352542B), a scheme is disclosed in which the remaining bath water amount and bath time are predicted by obtaining relevant parameters during water use and creating a proper neural network model, thereby improving the bath quality of a user.
However, for the user, if the remaining bathing time available for the hot water in the water heater can be known before bathing, the bathing activity can be more reasonably arranged, for example, the bathing is carried out simultaneously with the bathing, or the user firstly washes the head, and bathes after the water heater heats enough hot water, so that the phenomenon that the bathing activity is forced to stop in the middle due to insufficient hot water amount in the bathing activity process is avoided. It is therefore also very interesting to make a forecast of the remaining bathing time when no water is used.
However, when water is not discharged, the temperature in the bladder, the heat output rate, the water inlet temperature, the user bathing flow rate, the user bathing temperature and other parameters are involved, wherein the water inlet temperature, the bathing flow rate, the user bathing temperature and other parameters are unknown, and the residual bathing duration is difficult to predict. Based on this, a patent "a control method of an electric water heater and an electric water heater" (published japanese 2020.03.03, publication No. CN 110857821a) applied in china discloses a scheme of obtaining historical record data of the water heater, calculating and displaying the current remaining bath time of the electric water heater, thereby helping a user to know water consumption and remaining bath time. However, according to the scheme, the current residual bathing time is calculated by only obtaining the historical record data of the water heater, different calculation modes of water consumption and non-water consumption cannot be distinguished, so that the prediction accuracy is low, and a good prediction effect is difficult to achieve.
Disclosure of Invention
The invention provides a method and a device for predicting the remaining bath time length when an electric water heater is not used for overcoming the defects in the prior art, and the method and the device can improve the accuracy rate of predicting the remaining bath time length when the electric water heater is not used for water.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention discloses a method for predicting the remaining bathing time length when an electric water heater is not used, which comprises the following steps:
s1: when the electric water heater is in a non-water state, calculating the heat in the electric water heater according to the volume of an inner container of the electric water heater, the hot water output rate, and the detected water inlet temperature and the detected inner container temperature;
s2: acquiring historical unit time consumed heat corresponding to the current system time of the electric water heater;
s3: if the electric water heater is in a heating state, calculating to obtain heating heat increment in unit time;
s4: and calculating the remaining bath time of the electric water heater according to the heat in the electric water heater, the historical unit time consumed heat and the unit time heating increased heat.
Further, step S2 includes the steps of:
s2.1: inquiring in a unit time heat consumption database according to the current system time of the electric water heater to obtain a user habit water consumption time period corresponding to the current system time of the electric water heater;
s2.2: acquiring historical unit time consumed heat corresponding to the habit water period of the user;
the unit time heat consumption database stores historical unit time heat consumption data corresponding to the habit water period of the user; and the historical consumed heat in unit time corresponding to the habit water period of the user is obtained by calculating according to the historical inlet water temperature, the historical inlet water flow and the historical outlet water temperature detected in the habit water period of the user when the electric water heater is in a water using state every time.
Further, the historical unit time consumed heat corresponding to the habit water period of the user is calculated by the following formula:
ΔQ＝c*ρ*q*Δt*(T 2 -T 1 )
wherein c represents the specific heat capacity of water, ρ represents the density of water, Δ T represents a given unit time, and T 1 Indicating the historical inlet water temperature, T, of the electric water heater 2 The water inlet flow rate of the electric water heater is represented by Q, and delta Q represents the consumed heat quantity of the electric water heater in unit time.
Further, step S3 includes:
if the electric water heater is in a heating state, heating increased heat in unit time is obtained by calculating according to the heating power, the heating conversion efficiency and the specified unit time of the electric water heater through the following formula:
ΔQ e ＝P*η*Δt
wherein, is Δ Q e The heating heat quantity is increased by heating in unit time, P represents the heating power of the electric water heater, and eta represents the heating conversion efficiency.
Further, step S4 includes:
calculating and obtaining the remaining bath time of the electric water heater through the following formula:
wherein Q represents the heat in the electric water heater, Δ Q Target Representing said historical heat consumption per unit time, Δ Q e And the heating increase heat quantity per unit time is expressed, and the residual bath-available time of the electric water heater is t.
The second aspect of the invention discloses a device for predicting the remaining bathable time when an electric water heater is not using water, which comprises:
the first calculating unit is used for calculating the heat in the electric water heater according to the volume of the liner of the electric water heater, the output rate of hot water, the detected water inlet temperature and the detected temperature in the liner when the electric water heater is in a non-water state;
the acquisition unit is used for acquiring historical unit time consumed heat corresponding to the current system time of the electric water heater;
the second calculating unit is used for calculating and obtaining heating increasing heat in unit time when the electric water heater is in a non-water state and a heating state;
and the prediction unit is used for calculating and obtaining the residual bathable time length of the electric water heater according to the heat in the electric water heater, the historical unit time heat consumption and the unit time heating heat increase.
Further, the obtaining unit is specifically configured to, when the electric water heater is in the non-water state, query the heat consumption database in unit time according to the current system time of the electric water heater, so as to obtain a water usage habit period of the user corresponding to the current system time of the electric water heater; acquiring historical unit time consumed heat corresponding to the habit water use period of the user;
the unit time heat consumption database stores historical unit time heat consumption data corresponding to the habit water period of the user; and the historical consumed heat in unit time corresponding to the habit water period of the user is obtained by calculating according to the historical inlet water temperature, the historical inlet water flow and the historical outlet water temperature detected in the habit water period of the user when the electric water heater is in a water using state every time.
Further, the historical unit time consumed heat corresponding to the habit water period of the user is calculated by the following formula:
ΔQ＝c*ρ*q*Δt*(T 2 -T 1 )
wherein c represents the specific heat capacity of water, ρ represents the density of water, Δ T represents a given unit time, and T represents 1 Indicating the historical inlet water temperature, T, of the electric water heater 2 The water inlet flow rate of the electric water heater is represented by Q, and delta Q represents the consumed heat quantity of the electric water heater in unit time.
Further, the second calculating unit is specifically configured to calculate and obtain the heating increase heat per unit time according to the heating power, the heating conversion efficiency, and the specified unit time of the electric water heater when the electric water heater is in the non-water state and in the heating state, by using the following formula:
ΔQ e ＝P*η*Δt
wherein, is Δ Q e The heating heat quantity is increased in unit time, P represents the heating power of the electric water heater, and eta represents the heating conversion efficiency.
Further, the prediction unit is specifically configured to calculate and obtain the remaining bathable time of the electric water heater by using the following formula:
wherein Q represents the heat in the electric water heater, Δ Q Target Representing said historical heat consumption per unit time, Δ Q e And the heating increase heat quantity per unit time is expressed, and the residual bath-available time of the electric water heater is t.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention discloses a method and a device for predicting the remaining bathable time length when an electric water heater is not used, which calculate the heat quantity in the electric water heater according to the inner container volume, the hot water output rate, the detected water inlet temperature and the inner container temperature of the electric water heater when the electric water heater is in the non-water state, acquire the historical consumed heat quantity in unit time corresponding to the current system time of the electric water heater, calculate to acquire the heating increased heat quantity in unit time if the electric water heater is in the heating state, and finally calculate to acquire the remaining bathable time length of the electric water heater according to the heat quantity in the electric water heater, the historical consumed heat quantity in unit time and the heating increased heat quantity in unit time, thereby reducing the environmental influence when the electric water heater is in the non-water state and improving the prediction accuracy rate of the remaining bathable time length when the electric water heater is not used.
Drawings
Fig. 1 is a schematic diagram of a hardware structure of an electric water heater disclosed by an embodiment of the invention;
FIG. 2 is a flow chart of a method for predicting the remaining bathable time when the electric water heater is not using water in embodiment 1;
fig. 3 is a schematic view of a device for predicting the remaining bathable time when an electric water heater is not using water according to embodiment 2.
Wherein: 301. a first calculation unit; 302. an acquisition unit; 303. a second calculation unit; 304. and a prediction unit.
Detailed Description
In order to better understand the embodiment of the present invention, an application scenario of the embodiment of the present invention is a water storage type electric water heater (hereinafter referred to as an electric water heater), as shown in fig. 1, a hardware structure of the electric water heater may include a water outlet pipe, a water inlet pipe, an inner container of the electric water heater, a main controller and a display; wherein,
an outlet water temperature sensor for detecting the temperature of water is arranged in the outlet pipe, an inlet water temperature sensor for detecting the temperature of inlet water and a water flow sensor for detecting the flow of inlet water are arranged in the inlet pipe, and an inner container temperature sensor for detecting the temperature of an inner container and a heating unit for heating are arranged in the electric water heater for storing water;
the main controller comprises a first processing unit, a first communication unit, a first control unit and a power supply unit, wherein the water inlet temperature sensor, the water outlet temperature sensor, the liner temperature sensor and the water flow sensor are respectively and electrically connected with the first processing unit, the first processing unit can convert analog signals detected by the water inlet temperature sensor, the water outlet temperature sensor, the liner temperature sensor and the water flow sensor into digital signals, the heating unit is electrically connected with the first control unit, and the first control unit, the first processing unit and the first communication unit are respectively and electrically connected with the power supply unit;
the display comprises a storage unit, a second processing unit, a second communication unit, a display unit and a second control unit which are electrically connected in sequence, wherein the second processing unit and the second communication unit are also electrically connected with the second control unit respectively, the second communication unit is in wired communication with the first communication unit of the main controller, the second processing unit is used for calculating the remaining bath time, and the second control unit is used for setting parameters such as heating temperature, mode, on-off key and the like; the display unit may be a digital tube for displaying parameters such as remaining time, set temperature, current temperature, etc., and the storage unit is used for storing relevant data.
Further alternatively, the first communication unit and the second communication unit may be connected by wireless communication; if the two are connected in a wireless communication mode, the display needs an external power supply.
Further optionally, the water outlet pipe and the water inlet pipe are integrated with the electric water heater.
Further optionally, the electric water heater may further be provided with an electricity-proof wall, and the water inlet temperature sensor, the water flow sensor and the water outlet temperature sensor may be all disposed in the electricity-proof wall.
The technical solution of the present invention is further described with reference to the drawings and the embodiments. It is to be understood that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the embodiments of the invention.
Example 1
As shown in fig. 2, the present embodiment provides a method for predicting the remaining bathable time when an electric water heater is not using water, which includes the following steps:
s1: when the electric water heater is in a non-water state, the heat in the electric water heater is calculated according to the volume of the inner container of the electric water heater, the output rate of hot water, the detected water inlet temperature and the detected inner temperature of the inner container.
And if no water flow is detected to pass through the water inlet pipe or the water outlet pipe of the water storage type electric water heater, judging that the electric water heater is in a non-water state.
Alternatively, the heat Q in the electric water heater is calculated and can be represented by the following equation (1):
Q＝c*ρ*V*(T 3 -T 1 )*μ (1)
wherein c represents the specific heat capacity of water, usually 4200J/(kg K), ρ represents the density of water, specifically 1kg/m, V represents the inner container volume of the electric water heater, and T represents the specific heat capacity of water 1 The water inlet temperature of the electric water heater detected by the water inlet temperature sensor is represented; t is 3 The temperature in the inner container of the electric water heater detected by the inner container temperature sensor is shown, and mu shows the hot water output rate of the electric water heater.
S2: the method comprises the steps of obtaining historical unit time consumed heat corresponding to the current system time of the electric water heater.
Wherein the historical unit time consumed heat comprises the heat consumed by discharging water in the historical unit time.
As an alternative embodiment, step S2 may include the following steps:
s2.1: inquiring in a unit time heat consumption database according to the current system time of the electric water heater to obtain a user habit water consumption time period corresponding to the current system time of the electric water heater;
s2.2: and acquiring the historical unit time consumed heat corresponding to the habit water period of the user.
The unit time heat consumption database stores historical unit time heat consumption data corresponding to the habit water period of the user; the historical unit time consumed heat corresponding to the user habit water period is obtained by calculating according to the historical inlet water temperature, the historical inlet water flow and the historical outlet water temperature detected in the user habit water period when the electric water heater is in a water using state every time.
Specifically, before step S2, when the electric water heater is in a water use state, that is, during the normal water use process of the user, all the historical water use periods during which the user uses water every week or every day may be obtained, the user is numbered according to each historical water use period to obtain a user number, and a plurality of the user habit water use periods of the user are determined according to all the historical water use periods of the user. Detecting related water use data such as historical inlet water temperature, historical inlet water flow and historical outlet water temperature in each user habit water period, calculating historical unit time consumed heat corresponding to each user habit water period, finally, respectively associating and storing the historical unit time consumed heat corresponding to each user habit water period and each user habit water period with the user number of the user to a unit time consumed heat database, and updating the historical unit time consumed heat corresponding to the user habit water period after the user uses water in the same user habit water period each time.
When the electric water heater is in a water using state, the mode of calculating the historical consumed heat in unit time corresponding to each user habit water using time period according to the historical inlet water temperature, the historical inlet water flow and the historical outlet water temperature detected in each user habit water using time period can be calculated according to the following formula (2):
ΔQ＝c*ρ*q*Δt*(T 2 -T 1 ) (2)
wherein c represents the specific heat capacity of water, and ρ represents the density of water; Δ t represents a specified unit time, such as 1min, 1s, etc., where c, ρ, and Δ t may be values set in advance according to actual conditions; t is 1 Indicating electricity detected by water inlet temperature sensorHistorical inlet water temperature, T, of water heater 2 The historical outlet water temperature of the electric water heater detected by the outlet water temperature sensor is shown; q represents the historical inlet water flow of the electric water heater detected by the water flow sensor, and Δ Q represents the historical consumed heat per unit time.
Optionally, when the electric water heater is in a water using state, if the water consumption in a certain user habit water using period is less than 10 liters, the electric water heater is regarded as a small amount of water, and the calculation of the consumed heat in the historical unit time is not performed; and if the water consumption in a certain water consumption time interval is more than or equal to 10 liters, calculating the consumed heat in the historical unit time.
S3: if the electric water heater is in a heating state, the heating increasing heat in unit time is calculated.
If the electric water heater is in a heating state, heating heat increase quantity in unit time can be obtained by calculating according to the heating power, the heating conversion efficiency and the specified unit time of the electric water heater through the following formula (3):
ΔQ e ＝P*η*Δt (3)
wherein, is Δ Q e The heating quantity of the electric water heater is expressed, the heating power of the electric water heater is expressed, the heating conversion efficiency is expressed, and the delta t is expressed in the appointed unit time, such as 1min and 1 s. When the electric water heater is not in a heating state, P is 0; eta is the output efficiency of converting the heating heat of the electric water heater into hot water in the water discharging stage, the value of eta is related to the inlet water temperature, and different electric water heaters or different heating modes eta can be different.
S4: and calculating the remaining bath time of the electric water heater according to the heat in the electric water heater, the historical consumed heat in unit time and the heating increased heat in unit time.
The remaining bath time of the electric water heater specifically refers to the bath time of the remaining hot water in the electric water heater, which can be represented as t, and can be calculated by the following formula:
wherein Q represents the heat in an electric water heater, Δ Q Target Representing the heat consumed in the history per unit time, Δ Q e Indicating an increased heat per unit time of heating.
As an alternative embodiment, before executing step S2, it may also be determined whether the electric water heater is used for the first time or no relevant data is detected, and if not, step S2 is executed; if yes, the remaining bathing time of the electric water heater when water is not used can be calculated by adopting a preset value, wherein the preset water inlet temperature T 1 At 20 ℃ and a water outlet temperature T 2 The temperature is 40 ℃, and the water inlet flow q is 5L/min. Substituting the preset value into equation (2) may calculate the first consumed heat per unit time, and accordingly, step S4 may include: and calculating to obtain the first remaining washable bath time of the electric water heater according to the heat in the electric water heater, the first unit time consumed heat and the unit time heating increased heat.
The embodiment provides a method for predicting the remaining bathable time length when an electric water heater is not used, which comprises the steps of calculating the heat quantity in the electric water heater according to the volume of an inner container of the electric water heater, the output rate of hot water, the detected water inlet temperature and the detected inner temperature of the inner container when the electric water heater is in a non-water state, acquiring historical consumed heat quantity per unit time corresponding to the current system time of the electric water heater, calculating to acquire heating increased heat quantity per unit time if the electric water heater is in a heating state, and finally calculating to acquire the remaining bathable time length of the electric water heater according to the heat quantity in the electric water heater, the historical consumed heat quantity per unit time and the heating increased heat quantity per unit time, so that the influence of the environment can be reduced when the electric water heater is in the non-water state, and the prediction accuracy rate of the remaining bathable time length when the electric water heater is not used is improved.
Example 2
As shown in fig. 3, the present embodiment provides a device for predicting the remaining bathable time when an electric water heater is not using water, comprising a first calculating unit 301, an obtaining unit 302, a second calculating unit 303 and a predicting unit 304, wherein:
the first calculating unit 301 is configured to calculate heat in the electric water heater according to a volume of an inner container of the electric water heater, a hot water output rate, and a detected water inlet temperature and a detected inner container temperature when the electric water heater is in a non-water-use state;
an obtaining unit 302, configured to obtain historical consumed heat per unit time corresponding to current system time of an electric water heater;
the second calculating unit 303 is configured to calculate and obtain a heating increase amount per unit time when the electric water heater is in an unused water state and is in a heating state;
the prediction unit 304 is used for calculating and obtaining the remaining bathable time of the electric water heater according to the heat in the electric water heater, the historical consumed heat in unit time and the heating increased heat in unit time.
Optionally, the obtaining unit 302 is specifically configured to, when the electric water heater is in an unused state, query in the unit time heat consumption database according to the current system time of the electric water heater, so as to obtain a water usage habit time period of a user corresponding to the current system time of the electric water heater; acquiring historical unit time consumed heat corresponding to the habit water using period of the user;
the unit time heat consumption database stores historical unit time heat consumption data corresponding to the habit water period of the user; the historical consumed heat in unit time corresponding to the habit water use period of the user is obtained by calculating according to the historical water inlet temperature, the historical water inlet flow and the historical water outlet temperature which are detected in the habit water use period of the user when the electric water heater is in a water use state every time.
Optionally, the consumed heat of the historical unit time corresponding to the habit water period of the user is calculated by the following formula:
ΔQ＝c*ρ*q*Δt*(T 2 -T 1 )
wherein c represents the specific heat capacity of water, ρ represents the density of water, Δ T represents a given unit time, and T 1 Indicating the historical inlet water temperature, T, of an electric water heater 2 The historical outlet water temperature of the electric water heater is shown, Q shows the historical inlet water flow of the electric water heater, and delta Q shows the historical consumed heat in unit time.
Optionally, the second calculating unit 303 is specifically configured to calculate, according to the heating power, the heating conversion efficiency and the specified unit time of the electric water heater, the heating increase heat per unit time by using the following formula when the electric water heater is in the non-water state and in the heating state:
ΔQ e ＝P*η*Δt
wherein, is Δ Q e The heating heat quantity is increased in unit time, P represents the heating power of the electric water heater, and eta represents the heating conversion efficiency.
Optionally, the prediction unit 304 is specifically configured to calculate and obtain the remaining bathable time of the electric water heater by the following formula:
wherein Q represents the heat in an electric water heater, Δ Q Target Representing the heat consumed in the history per unit time, Δ Q e The heating and heat increasing in unit time is shown, and the rest bathable time of the electric water heater is t.
The embodiment provides a device for predicting the remaining bathable duration when an electric water heater is not used, which calculates the heat in the electric water heater according to the volume of an inner container of the electric water heater, the output rate of hot water, the detected water inlet temperature and the detected temperature in the inner container when the electric water heater is in a non-water state, acquires the historical consumed heat in unit time corresponding to the current system time of the electric water heater, calculates to acquire the heating increased heat in unit time if the electric water heater is in a heating state, and finally calculates to acquire the remaining bathable duration of the electric water heater according to the heat in the electric water heater, the historical consumed heat in unit time and the heating increased heat in unit time, so that the influence of the environment can be reduced when the electric water heater is in the non-water state, and the prediction accuracy rate of the remaining bathable duration when the electric water heater is not used is improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (4)
1. A method for predicting the residual bathable time length of an electric water heater without water is characterized by comprising the following steps:
s1: when the electric water heater is in a non-water state, calculating the heat in the electric water heater according to the volume of the inner container of the electric water heater, the output rate of hot water, and the detected water inlet temperature and the inner temperature of the inner container;
s2: acquiring historical unit time consumed heat corresponding to the current system time of the electric water heater;
s2.1: inquiring in a unit time heat consumption database according to the current system time of the electric water heater to obtain a user habit water consumption time period corresponding to the current system time of the electric water heater;
s2.2: acquiring historical unit time consumed heat corresponding to the habit water use period of the user;
the unit time heat consumption database stores historical unit time heat consumption data corresponding to the habit water use period of the user; the historical consumed heat in unit time corresponding to the habit water period of the user is obtained by calculation according to the historical inlet water temperature, the historical inlet water flow and the historical outlet water temperature detected in the habit water period of the user when the electric water heater is in a water using state every time;
the historical unit time consumed heat corresponding to the habit water period of the user is calculated by the following formula:
ΔQ＝c*ρ*q*Δt*(T 2 -T 1 )
wherein c represents the specific heat capacity of water, ρ represents the density of water, Δ T represents a given unit time, and T represents 1 Indicating the historical inlet water temperature, T, of the electric water heater 2 The historical outlet water temperature of the electric water heater is represented, Q represents the historical inlet water flow of the electric water heater, and delta Q represents the historical consumed heat in unit time;
s3: if the electric water heater is in a heating state, calculating to obtain heating increased heat in unit time;
s4: calculating and obtaining the remaining washable bath time of the electric water heater according to the heat in the electric water heater, the historical unit time consumed heat and the unit time heating increased heat; calculating and obtaining the remaining bath time of the electric water heater through the following formula:
wherein Q represents the heat in the electric water heater, Δ Q represents the historical unit time consumed heat, Δ Q e Represents the heating increasing heat quantity per unit time, and t is the residual washable bath time length of the electric water heater.
2. The method for predicting the remaining bathable time when an electric water heater is not using water as claimed in claim 1, wherein the step S3 comprises:
if the electric water heater is in a heating state, heating increased heat in unit time is obtained by calculating according to the heating power, the heating conversion efficiency and the specified unit time of the electric water heater through the following formula:
ΔQ e ＝P*η*Δt
wherein, Δ Q e The heating heat quantity is increased in unit time, P represents the heating power of the electric water heater, and eta represents the heating conversion efficiency.
3. A device for predicting the time length of the residual bathable time when an electric water heater is not used is characterized by comprising:
the first calculating unit is used for calculating the heat in the electric water heater according to the volume of the liner of the electric water heater, the output rate of hot water, the detected water inlet temperature and the detected temperature in the liner when the electric water heater is in a non-water state;
the acquisition unit is used for acquiring historical unit time consumed heat corresponding to the current system time of the electric water heater;
the acquisition unit is specifically used for inquiring in a unit time heat consumption database according to the current system time of the electric water heater when the electric water heater is in the non-water state so as to obtain a user habit water consumption time period corresponding to the current system time of the electric water heater; acquiring historical unit time consumed heat corresponding to the habit water using period of the user;
the unit time heat consumption database stores historical unit time heat consumption data corresponding to the habit water period of the user; the historical consumed heat in unit time corresponding to the habit water period of the user is obtained by calculation according to the historical inlet water temperature, the historical inlet water flow and the historical outlet water temperature detected in the habit water period of the user when the electric water heater is in a water using state every time;
the historical unit time consumed heat corresponding to the habit water period of the user is calculated by the following formula:
ΔQ＝c*ρ*q*Δt*(T 2 -T 1 )
wherein c represents the specific heat capacity of water, ρ represents the density of water, Δ T represents a given unit time, and T represents 1 Indicating the historical inlet water temperature, T, of the electric water heater 2 The historical outlet water temperature of the electric water heater is represented, Q represents the historical inlet water flow of the electric water heater, and delta Q represents the historical consumed heat in unit time;
the second calculating unit is used for calculating and obtaining the heating increased heat in unit time when the electric water heater is in a non-water state and a heating state;
the prediction unit is used for calculating and obtaining the residual washable bath time length of the electric water heater according to the heat quantity in the electric water heater, the historical unit time consumed heat quantity and the unit time heating increased heat quantity; the method is specifically used for calculating and obtaining the remaining bath time of the electric water heater through the following formula:
wherein Q represents the heat in the electric water heater, Δ Q represents the historical unit time consumed heat, Δ Q e And the heating increase heat quantity per unit time is expressed, and the residual bath-available time of the electric water heater is t.
4. The device according to claim 3, wherein the second calculating unit is specifically configured to calculate and obtain the heating heat increment per unit time according to the heating power, the heating conversion efficiency and the specified unit time of the electric water heater when the electric water heater is in the non-water state and in the heating state, by using the following formula:
ΔQ e ＝P*η*Δt
wherein, is Δ Q e The heating heat quantity is increased in unit time, P represents the heating power of the electric water heater, and eta represents the heating conversion efficiency.
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