JP2007032880A - Operation plan preparing device and operation plan preparing method for storage type electric water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation plan generating device for a storage type electric water heater capable of preventing the occurrence of hot water shortage in the daytime and improving COP. <P>SOLUTION: This operation plan preparing device comprises a heat consumption predicting means for computing predicted heat consumption of each unit time zone of a planned time zone based on the result value of heat consumption of each time zone in the past stored in a heat consumption storage means; a heat storage amount detecting means for measuring an initial heat storage amount; and a heat supply time zone determining means for determining a heat supply time zone based on the initial heat storage amount and the predicted heat consumption of each unit time zone. The heat supply time zone determining means determines a heat supply time zone so that the heat storage amount of a hot water storage tank is not less than a minimum heat storage amount in the planned time zone and that the start time of the heat supply time zone is the latest. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation plan creation technique for creating an operation plan for a hot water storage type electric water heater, and more particularly to an operation plan creation technique capable of preparing a boiling plan so as not to fall below a predetermined threshold value in advance.

  At present, hot water storage type electric water heaters that use hot water in a hot water storage tank by using late-night electricity in each household and use the hot water the next day are widely used. In such a hot water storage type electric water heater, nighttime hot water is generated by an electric heater such as an electric heater or a heat pump.

  By the way, in the hot water storage type electric water heater, when the amount of heat consumed in the daytime exceeds the available amount of heat stored in the hot water storage tank, the hot water storage state is reached. In the case of running out of hot water, it is necessary to store heat in the hot water storage tank using an electric heater. However, since the heat storage speed by an electric heater is generally slow, heat storage requires a considerable time. Therefore, in the hot water storage type electric water heater, it is necessary to store a sufficient amount of heat in the hot water storage tank at night so that the hot water condition does not occur as much as possible.

  On the other hand, while the hot water is stored in the hot water storage tank, it dissipates heat by thermal diffusion, and the temperature gradually decreases. The larger the amount of heat stored in the hot water storage tank, the greater the heat dissipation loss. When heat dissipation loss occurs, device efficiency (hereinafter referred to as “COP (Coefficient of Performance)”) decreases. Therefore, from the viewpoint of improving COP, it is preferable to suppress as much as possible the margin of the heat storage amount when storing heat in the hot water storage tank at night.

  For the above reasons, hot water storage type electric water heaters usually predict an integrated value of the amount of heat of hot water consumed in a day at home (hereinafter referred to as “heat load”), and based on the predicted value, Control is performed to determine the amount of heat when boiling hot water in the hot water storage tank at night. As a method for obtaining the predicted value of the thermal load, the estimated value of the thermal load is obtained by measuring and learning the integrated value of the amount of heat of the hot water actually consumed in the day (hereinafter referred to as “thermal load result”). It is common to use a method. Further, the predicted heat load is a value obtained by reducing the margin of the heat storage amount as much as possible from the viewpoint of improving COP.

  By the way, the heat load results at home vary with a certain probability distribution from day to day. Therefore, even if a margin is provided as the predicted heat load value, the actual heat load exceeds the predicted heat load value with a certain probability. On the other hand, if a margin is set such that the actual heat load does not exceed the predicted heat load, the COP becomes extremely poor. Therefore, in the hot water storage type electric water heater, an operation plan for the electric water heater in the daytime is created on the assumption that the actual heat load may exceed the predicted heat load value.

  As a conventional hot water storage water heater operation plan generation technique, there is a known method for generating an operation plan by measuring the actual heat load time and the amount of heat used, and learning from the actual measured value of the heat load. ing. As such an operation plan generation method, those described in Patent Documents 1 and 2 are known.

  In the operation plan generation method for the hot water supply apparatus described in Patent Document 1, the predicted hot water supply time is derived based on the actual hot water supply time to the bathtub. And an operation plan is produced | generated so that the hot water storage to the hot water storage tank may be completed before the setting margin time of hot water supply prediction time. Moreover, the actual hot water supply time performed according to the hot water supply command is compared with the predicted hot water supply time, and the set margin time is sequentially changed based on the comparison result. Thereby, it is suppressed that the amount of hot water stored is insufficient and that the hot water is left in the hot water storage tank for a long period of time, thereby improving energy efficiency.

In the hot water supply device operation plan generation method described in Patent Literature 2, the operation control means for controlling the operation of the hot water storage means for storing hot water in the hot water storage tank actually performs hot water filling to supply hot water from the hot water storage tank to the bathtub. A predicted hot water filling time is obtained based on the accumulated hot water filling time data in which the actual hot water filling time is accumulated. An operation plan of the hot water storage means is created so that the heat storage amount of the hot water storage tank becomes the target heat storage amount before the set margin time before the predicted hot water filling time. Further, when the operation control means sets an allowable range of the predicted hot water filling time based on the accumulated actual hot water filling time data, and the predicted hot water filling time obtained based on the accumulated actual hot water filling time data is outside the allowable range. Corrects the predicted hot water filling time to approach the allowable range. Thereby, it is possible to perform hot water filling appropriately while improving energy efficiency.
JP 2005-172325 A JP 2005-172326 A

  The above-described conventional hot water heater operation plan generation method predicts the hot water filling time by learning the hot water filling time based on the hot water filling to the bathtub, which is generally considered to have the largest heat load. The time distribution is also learned to learn the length of the set margin time.

  However, in an actual home or the like, the heat load may be caused by various factors such as hot water supply, heating, floor heating, etc. in addition to hot water filling a bathtub. Therefore, it is required to generate an operation plan that does not cause hot water shortage in consideration of these various hot water supply loads.

  At the same time, from the viewpoint of improving the COP as much as possible, it is also necessary to reduce the amount of heat stored in the hot water storage tank during the day.

  However, in the conventional operation plan generation method, various hot water supply loads other than hot water filling to the bathtub are not considered. In addition, there is a lack of consideration for minimizing the amount of heat stored in the hot water storage tank during the daytime.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hot water storage type electric appliance that can prevent hot water from running out for various hot water supply loads in the daytime, reduce the heat storage amount of the hot water storage tank in the daytime as much as possible, and improve COP. It is to provide an operation plan generation technology for a water heater.

  A first configuration of a hot water storage type electric water heater operation plan creation device according to the present invention is a hot water storage type electric water heater provided with a hot water storage tank and an electric water heater for supplying heat to the hot water storage tank. An operation plan creation device for determining a time zone in which heat is supplied by a heater, wherein the heat consumption measuring means measures the actual value of the heat consumption in each time zone of the day; consumption measured by the heat consumption measuring means Heat consumption amount storage means for storing the actual value of heat amount; based on the actual value of heat consumption in the past time periods stored in the heat consumption amount storage means until the predetermined time (hereinafter referred to as “planned time period”). ) Heat consumption prediction means for calculating the predicted heat consumption in each unit time zone; heat storage amount detection means for measuring the heat storage amount of the hot water storage tank (hereinafter referred to as “initial heat storage amount”) at the present time; and the initial heat storage amount and Each unit time A heating time zone determining means for determining a time zone for supplying heat to the hot water storage tank (hereinafter referred to as “heating time zone”) based on the predicted heat consumption of the belt, The heat supply so that the heat storage amount of the hot water storage tank does not fall below a predetermined threshold (hereinafter referred to as “minimum heat storage amount”) in the planned time zone, and the start time of the heat supply time zone is the latest. It is characterized by determining a time zone.

  With this configuration, the heat supply time zone determining means calculates the predicted heat consumption amount in each time zone of the planned time zone based on the actual value of the heat consumption amount in each past time zone. Therefore, if an operation plan is created based on this predicted heat consumption, it is possible to prevent hot water from running out for various hot water supply loads. The heat supply time zone determining means determines the heat supply time zone so that the heat storage amount of the hot water storage tank does not fall below the minimum heat storage amount in the planned time zone, and the start time of the heat supply time zone is the latest. To do. Therefore, the amount of heat stored in the hot water storage tank during the planned time zone can be reduced as much as possible.

  According to a second configuration of the hot water storage type electric water heater operation plan creation device according to the present invention, in the first configuration, the heating time zone determining means sets each unit time zone of the planned time zone as Selection means for sequentially selecting from the unit time zone to the last unit time zone; for the unit time zone selected by the selection means (hereinafter referred to as “selected time zone”), the selection time from the start time of the planned time zone A heat supply amount calculating means for calculating an integrated value (hereinafter referred to as “integrated heat supply amount”) of heat supplied from the electric heater to the hot water storage tank by the start time of the belt; a unit time zone at the beginning of the planned time zone; Is a value obtained by subtracting the minimum heat storage amount from a value obtained by adding the integrated heat supply amount to the initial heat storage amount (hereinafter referred to as “integrated prediction heat consumption amount”) (hereinafter referred to as “integrated prediction heat consumption amount”). "Reserved heat storage")) In this case, an insufficient heat amount calculating means for calculating a value (hereinafter referred to as “insufficient heat amount”) obtained by subtracting the marginal heat storage amount from the integrated predicted heat consumption amount; the amount of heat supply per unit time of the electric heater (Hereinafter referred to as “heating rate”) The heating required time calculating means for calculating the required heating time by dividing by the time; the time zone before the time before the predetermined margin time width from the start time of the selected time zone; A heating time zone setting means for setting a time zone (hereinafter referred to as “heating time zone”) for heating the hot water storage tank from the electric heater for the required heating time. The heating time zone setting means is such that the newly set heating time zone does not overlap the already set heating time zone, and the start time of the newly set heating time zone is the latest. It is characterized by setting a heat supply time zone.

  With this configuration, the insufficient heat amount calculation means predicts the time when the initial heat storage amount is consumed up to the minimum heat storage amount for each time zone, and heats the time before the time zone when hot water runs out by a certain margin time width. Set to end time. Further, the insufficient heat quantity calculating means calculates the insufficient heat quantity expected in the time zone. Then, the required heat supply time calculating means calculates the required heat supply time required for boiling the hot water in the hot water storage tank by the insufficient heat amount. And a heat supply time zone setting means sets the heat supply time zone for the required heat supply time before the heat supply end time. In this case, when it overlaps with the already set heating time zone, the heating time zone is set before the already set heating time zone only for the overlapping portion. As a result, it is possible to prevent hot water from running out and to reduce the amount of heat stored in the hot water storage tank as much as possible during the planned time period.

  According to a third configuration of the hot water storage type electric water heater operation plan creation device according to the present invention, in the second configuration, the heat supply time zone determining means is configured so that the selected time zone is determined from a start time of the planned time zone. A heat dissipation loss calculating means for calculating a heat dissipation loss in the hot water storage tank until the start time, wherein the insufficient heat amount calculating means is a value obtained by subtracting the heat dissipation loss from the marginal heat storage amount (hereinafter referred to as “correction”). When the excess heat storage amount is exceeded, a value obtained by subtracting the corrected margin heat storage amount from the integrated predicted heat consumption amount is calculated as the insufficient heat amount.

  With this configuration, it is possible to create an operation plan in consideration of the heat dissipation loss lost due to heat dissipation from the hot water in the hot water storage tank in the planned time zone.

  A first configuration of an operation plan creation method for a hot water storage type electric water heater according to the present invention is a hot water storage type electric water heater provided with a hot water storage tank and an electric water heater for supplying heat to the hot water storage tank. A method for preparing an operation plan for determining a time zone in which heat is supplied by a heater, wherein an actual heat consumption value is measured in each time zone of a day and stored in a heat consumption storage means; Consumption for calculating the predicted heat consumption of each unit time zone from the present time to a predetermined time later (hereinafter referred to as “planned time zone”) based on the past actual value of heat consumption of each time zone stored in the heat quantity storage means A heat amount prediction step; a heat storage amount detection step for measuring a heat storage amount of the hot water storage tank (hereinafter referred to as “initial heat storage amount”) at the present time; and a hot water storage tank based on the initial heat storage amount and the predicted heat consumption amount in each unit time zone. A heating time zone determining step for determining a time zone during which heat is supplied to the tank (hereinafter referred to as “heating time zone”), and in the heating time zone determining step, the hot water storage tank in the planned time zone The heat supply time zone is determined so that the heat storage amount of the heat does not fall below a predetermined threshold (hereinafter referred to as “minimum heat storage amount”) and the start time of the heat supply time zone is the latest. And

  The second configuration of the hot water storage type electric water heater operation plan creation method according to the present invention is the first configuration, wherein, in the heating time zone determination step, each unit time zone of the planned time zone is A selection step of sequentially selecting from the unit time zone to the last unit time zone; for the unit time zone selected in the selection step (hereinafter referred to as “selected time zone”), the selection from the start time of the planned time zone A heat supply amount calculating step for calculating an integrated value (hereinafter referred to as “integrated heat supply amount”) of the amount of heat supplied from the electric heater to the hot water storage tank by the start time of the time zone; the first unit time of the planned time zone; A value obtained by subtracting the minimum heat storage amount from a value obtained by adding the integrated heat supply amount to the initial heat storage amount (hereinafter referred to as “integrated prediction heat consumption amount”) from the belt to the selected time zone Less than" If the excess heat storage amount is exceeded, an insufficient heat amount calculation step for calculating a value obtained by subtracting the marginal heat storage amount from the integrated predicted heat consumption amount (hereinafter referred to as “insufficient heat amount”); Heat supply required time calculating step for calculating the required heat supply time by dividing by the amount of heat supplied per unit time (hereinafter referred to as “heat supply speed”); a predetermined margin time width from the start time of the selected time zone Heating time for setting a time zone for heating the hot water storage tank from the electric heater for the required heating time (hereinafter referred to as “heating time zone”) within a time zone just before the previous time. In the heating time zone setting step, the newly set heating time zone does not overlap with the already set heating time zone, and the newly set heating time zone So that the start time of And performing setting of the thermal time zone.

  According to a third configuration of the hot water storage type electric water heater operation plan creation method according to the present invention, in the second configuration, in the heating time zone determination step, the selected time zone from the start time of the planned time zone. A heat dissipation loss calculating step for calculating a heat dissipation loss in the hot water storage tank until the start time of the heat sink, and in the insufficient heat amount calculating step, the integrated predicted heat consumption is a value obtained by subtracting the heat dissipation loss from the marginal heat storage amount ( (Hereinafter referred to as “corrected surplus heat storage amount”), a value obtained by subtracting the corrected surplus heat storage amount from the integrated predicted heat consumption amount is calculated as the insufficient heat amount.

  The program according to the present invention is read and executed by a computer, thereby causing the computer to function as an operation plan creation device having any one of the configurations 1 to 3.

  As described above, according to the present invention, it is possible to effectively prevent hot water from running out with respect to various hot water supply loads in the planned time zone. At the same time, since the amount of heat stored in the hot water storage tank can be reduced as much as possible in the planned time zone, the COP can be improved to the maximum.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of a hot water storage type electric water heater 1 according to Embodiment 1 of the present invention. The hot water storage type electric water heater 1 includes a hot water storage tank 2, an electric heater 10, and a memorial heat exchanger 30.

  The hot water storage tank 2 is a stratified hot water storage tank that stores hot water by storing hot water. A water supply path 3 is connected to the bottom of the hot water storage tank 2. Water is supplied from the water supply to the hot water storage tank 2 through the water supply channel 3. The water supply path 3 is provided with a water supply source valve 4, a flow rate sensor 6, and a temperature sensor 7 that are electromagnetic on-off valves. The flow rate sensor 6 detects the flow rate of water supplied to the hot water storage tank 2. The temperature sensor 7 detects the temperature of water or hot water flowing into the bottom of the hot water storage tank 2.

  The hot water storage tank 2 is provided with four temperature sensors 5a, 5b, 5c, 5d from the upper part to the lower part. These temperature sensors 5a, 5b, 5c, and 5d measure the temperature of the hot water inside the tank.

  The electric heater 10 is a device that supplies heat to the hot water in the hot water storage tank 2. As the electric heater 10, an electric heater or a heat pump is used.

  The electric heater 10 is connected to the bottom and top of the hot water tank 2 by a heat supply circuit 11. On the heat supply circuit 11, a flow sensor 14, a heat supply circulation pump 12, a heat supply circuit valve 13, and a temperature sensor 16 are provided. The heat supply circulation pump 12 is a pump for circulating hot water through the heat supply circuit 11 from the bottom to the top of the hot water storage tank 2. The heat supply circuit valve 13 is an electromagnetic open / close valve, and opens and closes the heat supply circuit 11. The flow rate sensor 14 detects the flow rate of the hot water flowing through the heat supply circuit 11. The temperature sensor 16 detects the temperature of the hot water returned to the top of the hot water storage tank 2.

  A hot water supply path 21 is connected to the top of the hot water storage tank 2 so as to branch from the heat supply circuit 11. The hot water supply channel 21 is a water channel for supplying hot water from the hot water storage tank 2 to a hot water tap and various hot water devices. The hot water supply passage 21 is provided with a hot water supply mixing valve 22, a flow rate sensor 23, and a temperature sensor 24. The hot water mixing valve 22 mixes hot water supplied from the hot water storage tank 2 and water sent from the water supply channel 3. The temperature sensor 24 detects the temperature of the mixed warm water.

  The recuperation heat exchanger 30 is a heat exchanger for retreating a bath using hot water in the hot water storage tank 2. The memorial heat exchanger 30 is passed through a memorial circuit 31 connected across the top and bottom of the hot water storage tank 2 and a bath circuit 32 through which bath water in the bath tub circulates. The memorial heat exchanger 30 exchanges heat between the hot water in the memorial circuit 31 and the bath water in the bath circuit 32.

  On the remedy circuit 31, a remedy circulation pump 33, a flow sensor 35, a remedy circuit valve 34, and a temperature sensor 37 are provided. The memory circulation pump 33 is a pump that circulates hot water from the top to the bottom of the hot water storage tank 2 through the memory circuit 31. The memory circuit valve 34 is an electromagnetic on-off valve. The flow rate sensor 35 detects the flow rate of the hot water circulating through the tracking circuit 31. The temperature sensor 37 detects the temperature of the hot water circulating through the tracking circuit 31.

  The bath circuit 32 is provided with a bath circulation pump 36. The bath circulation pump 36 is a pump that circulates bathtub water in the bath circuit 32.

  Next, the operation plan creation device 40 according to the first embodiment will be described. FIG. 2 is a block diagram illustrating a functional configuration of the operation plan creation device 40 according to the first embodiment. The operation plan creation device 40 includes a clock means 41, a heat consumption measuring means 42, a heat consumption storage means 43, a heat consumption prediction means 44, a heat storage amount detection means 45, and a heat supply time zone determination means 46.

  The clock means 41 outputs the current time. The consumed heat amount measuring means 42 measures the actual value of the consumed heat amount (hereinafter referred to as “heat load actual result”) in each time zone of the day. The consumed heat amount storage means 43 stores the actual value of the consumed heat amount measured by the consumed heat amount measuring means 42.

  Here, the actual heat load is performed as follows.

When hot water is supplied through the hot water supply passage 21 at time t, the heat load q _h (t) is calculated from the hot water supply temperature T _h (t) detected by the temperature sensor 16 and the hot water supply flow rate J _h (t) detected by the flow sensor 23. Is obtained by the following equation (1). However, _{T 0} is the reference temperature.

Similarly, when a bath is reheated by the reheating circuit 31, the heat load q _h is calculated from the hot water supply temperature T _h (t) detected by the temperature sensor 37 and the hot water supply flow rate J _h (t) detected by the flow sensor 35. _h (t) is obtained by the equation (1).

The heat consumption measuring means 42 integrates the heat load q _h (t) every hour, and obtains the heat load record q (t) in the time period t to t + Δt. Here, Δt is the time width of the unit time zone, and is 1 hour in this embodiment. And the heat load performance of the heat consumption memory | storage means 43 is updated. The heat consumption amount storage means 43 stores N heat load results q (1) to q (N) for each time period of one day. The method of updating the heat load record may be simply rewritten with a new value, but the heat load record q (1) to q (N) stored in the heat consumption storage means 43 and the newly measured heat load You may make it update with the average value with track record q (1) -q (N).

  The heat consumption prediction means 44 is based on the actual value of heat consumption in each past time zone stored in the heat consumption storage means 43, and the predicted heat consumption in each unit time zone from the present time to a predetermined time later (planned time zone). Is calculated.

  The heat storage amount detection means 45 measures the heat storage amount (initial heat storage amount) of the hot water storage tank 2 at the present time based on the temperatures detected by the temperature sensors 5a, 5b, 5c, 5d. The heat supply time zone determining means 46 determines a time zone (heat supply time zone) for supplying heat to the hot water storage tank 2 based on the initial heat storage amount and the predicted heat consumption amount of each unit time zone.

  With reference to the heat supply time zone determined by the operation plan creation device 40 as described above, the boiling control means 47 sets a boiling permission time zone and performs boiling water boiling control in the hot water storage tank 2. .

  FIG. 3 is a diagram showing the configuration of the heat supply time zone determination means 46 of FIG. The heat supply time zone determination means 46 includes a selection means 51, a heat supply amount calculation means 52, a heat dissipation loss calculation means 53, an insufficient heat amount calculation means 54, a required heat supply time calculation means 55, and a heat supply time zone setting means 56. Yes.

  The selection means 51 sequentially selects each unit time zone of the planned time zone from the first unit time zone to the last unit time zone. For the unit time zone (selected time zone) selected by the selecting means 51, the heat supply amount calculating means 52 is connected from the electric heater 10 to the hot water storage tank 2 from the start time of the planned time zone to the start time of the selected time zone. The integrated value (integrated heat supply amount) of the amount of heat supplied to is calculated. The heat dissipation loss calculating means 53 calculates the heat dissipation loss in the hot water storage tank 2 from the start time of the planned time zone to the start time of the selected time zone.

  Insufficient heat amount calculation means 54 is configured such that the integrated value of predicted heat consumption (integrated predicted heat consumption) from the first unit time zone of the planned time zone to the selected time zone is the lowest from the value obtained by adding the integrated heat supply amount to the initial heat storage amount. If it exceeds the value obtained by subtracting the heat storage amount and the heat radiation loss (corrected margin heat storage amount), the value obtained by subtracting the correction margin heat storage amount from the integrated predicted heat consumption (insufficient heat amount) is calculated.

  The required heat supply time calculating means 55 calculates the required heat supply time by dividing the shortage heat amount by the heat supply amount (heat supply speed) per unit time of the electric heater 10.

  The heat supply time zone setting means 56 heats the hot water storage tank 2 from the electric heater 10 for the required heat supply time within a time zone before a predetermined margin time width from the start time of the selected time zone. Set the time zone (heat supply time zone).

  The operation of the operation plan creation device 40 according to the present embodiment configured as described above will be described below.

  FIG. 4 is a flowchart illustrating the operation of the operation plan creation device 40 according to the first embodiment.

  First, in step S1, the heat consumption prediction unit 44 refers to the actual value of the heat consumption in each time zone stored in the heat consumption storage unit 43, and the heat consumption q (1) to q (1) to q in each time zone on the current day. (N) is calculated.

Next, in step S2, the heat storage amount detecting means 45, based on the temperature of the temperature sensor 5a, 5b, 5c, 5d is detected, detects the hot water heat content _{Q 0} in the hot water storage tank 2 at the present time. Then, to initialize the virtual heat content Q to Q _0.

  Next, in step S <b> 3, the heat supply time zone determination means 46 sets the virtual time zone t, which is an internal variable, to 1.

  Next, in step S4, the heat supply time zone determining means 46 subtracts the heat consumption amount q (t) in the virtual time zone t from the virtual heat storage amount Q.

Next, in step S5, heat supply time period determining means 46 determines whether the virtual heat content Q is less than the threshold Q _th. Here, the threshold value Q _th represents the minimum heat storage amount of the hot water storage tank 2. If Q ≧ Q _th, the process proceeds to step S9.

When Q <Q _th , in step S6, the insufficient heat amount calculation unit 54 calculates the insufficient heat amount ΔQ. The insufficient heat quantity ΔQ can be calculated by ΔQ = Q _th −Q.

Next, in step S7, the required heat supply time calculation means 55 calculates the required heat supply time ΔT. The required heating time ΔT can be calculated by ΔT = ΔQ / v _q using the heating rate v _q of the electric heater 10.

  Next, in step S8, the heat supply time zone setting means 56 sets the heat supply time zone. Details of the heat supply time zone setting process will be described later.

  Next, in step S9, the virtual time zone t is incremented by 1 hour.

  Next, when the virtual time zone t is N or less, the process returns to step S24. If t = N + 1, the process ends.

  FIG. 5 is a flowchart showing the heat supply time zone setting process.

In step S <b> 11, [t−t ₀ −ΔT, t−t ₀ ] is set as a temporary setting time zone of the heat supply time zone. Here, t ₀ is a buffer time width provided in consideration of a time lag between the predicted heat consumption time zone and the actual heat consumption time zone, and is referred to as “margin time”. Further, t is a virtual time zone, and ΔT is a time required for heating.

  Next, in step S12, it is determined whether or not a heat supply time zone has already been set within the newly set temporary set time zone. When the heat supply time zone is not set within the temporarily set time zone, the process proceeds to step S15. On the other hand, when the heating time zone is already set within the temporarily set time zone, the process proceeds to the next step S13.

In step S13, a time width (hereinafter referred to as “overlap width”) ΔT _{over in} which the newly set temporarily set time zone overlaps with the preset heat supply time zone is calculated.

Next, in step S14, a heating time zone corresponding to the overlap width ΔT _over is added before the preset heating time zone.

  Finally, in step S15, a temporary setting time zone excluding a portion overlapping with the preset heating time zone is set as the heating time zone, and the heating time zone setting process is terminated.

  FIG. 6 shows an example of an operation plan of the hot water storage type electric water heater 1 created by the operation plan creation method of the first embodiment. Due to boiling at night, the hot water storage tank 2 is in a state of storing heat at 7:00 in the morning. The virtual heat storage amount Q is initialized by this heat storage amount.

In the example of FIG. 6, there are predicted loads (1) to (4) as predicted heat loads within the time of 7:00 to 23:00. Thus, while subtracting the heat radiation loss from the virtual heat storage amount Q in each time zone, the predicted heat consumption is subtracted in the time zone of the predicted loads (1) to (4). Then, in the example of FIG. 6, it is understood that the virtual heat storage amount Q is insufficient after the time zone t ⁽³⁾ when the predicted load (3) occurs. Therefore, first, calculates the insufficient amount of heat Delta] Q ⁽³⁾ in the time zone ^{t (3),} an electrical supply heat 10 heat supply required time ΔT ⁽³⁾ required to generate the missing heat quantity Delta] Q ⁽³⁾ Ask. Then, the time zone “t ⁽³⁾ −t ₀ −ΔT ⁽³⁾ , t ⁽³⁾ −t ₀ ]] is set as the heating time zone.

Next, the virtual heat storage amount Q is insufficient in the time zone t ⁽⁴⁾ when the predicted load (4) occurs. Therefore, similarly, computes the missing heat quantity Delta] Q ⁽⁴⁾ in the time zone t ^(4), heat supply duration ΔT of the electrical supply heat 10 required to generate the missing heat quantity ΔQ ^{(4) (4)} Ask for. Then, the time zone “t ⁽⁴⁾ −t ₀ −ΔT ⁽⁴⁾ , t ⁽⁴⁾ −t ₀ ]” is set as the heating time zone. However, the previously set heating time zone “t ⁽³⁾ −t ₀ −ΔT ⁽³⁾ , t ⁽³⁾ −t ₀ ], the heating time period “t ⁽³⁾ −t ₀ −ΔT ⁽³⁾ , The heating time zone is loaded on the part before t ⁽³⁾ -t ₀ ], so that a heating time zone having a length of ΔT ⁽³⁾ + ΔT ⁽⁴⁾ is set (section in FIG. 6). A, B).

  With the start point of this heat supply time zone as a boundary, the previous time zone is called the boiling prohibited time zone, and the later time zone is called the boiling allowed time zone.

  In the boiling prohibition time zone, the boiling control means 47 does not perform the boiling of hot water in the hot water storage tank 2 by the electric heater 10 in principle. However, as an exception, when the heat storage amount of the hot water in the hot water storage tank 2 is less than the minimum heat storage amount and there is a predicted heat load in the subsequent time zone, boiling is performed.

  In the boiling allowance time zone, the boiling control means 47 can boil hot water in the hot water storage tank 2 by the electric heater 10. The boiling time is in principle the time width of the heating time period obtained above.

  FIG. 7 is a diagram showing the boiling operation by the electric heater 10 and the transition of the amount of stored hot water. In the boiling-up prohibition time zone, the amount of heat stored in the hot water storage tank 2 decreases due to heat dissipation loss and heat load. When the heat supply time zone is entered, the amount of heat stored in the hot water storage tank 2 rises by a necessary amount, and a shortage of heat is supplied. Finally, an operation plan is created so that the amount of heat stored in the hot water storage tank 2 is almost used up. Therefore, heat dissipation loss can be suppressed as much as possible, and COP can be improved.

  In the first embodiment, the operation plan creation device has been described as an example of hardware configuration. However, in the present invention, each functional configuration of the operation plan creation device is configured by a program module, and the program is You may make it implement | achieve an operation plan preparation apparatus by performing with a computer.

It is a block diagram of the hot water storage type electric water heater which concerns on Example 1 of this invention. 3 is a block diagram illustrating a functional configuration of an operation plan creation device 40 according to Embodiment 1. FIG. It is a figure showing the structure of the heating time zone determination means 46 of FIG. 3 is a flowchart illustrating the operation of the operation plan creation device 40 according to the first embodiment. It is a flowchart showing a heat supply time slot | zone setting process. It is a figure showing the example of the operation plan of the hot water storage type electric water heater created with the operation plan creation method of the present Example 1. It is the figure which showed the transition of the boiling operation by the electric heater 10, and the amount of stored hot water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage type electric water heater 2 Hot water storage tank 3 Water supply path 4 Water supply original valve 5a, 5b, 5c, 5d Temperature sensor 6 Flow rate sensor 7 Temperature sensor 10 Electric heater 11 Heat supply circuit 12 Heat supply circulation pump 13 Heat supply circuit valve 14 Flow sensor 16 Temperature sensor 21 Hot water supply path 22 Hot water supply mixing valve 23 Flow sensor 24 Temperature sensor 30 Remembrance heat exchanger 31 Remembrance circuit 32 Bath circuit 33 Remembrance circulation pump 34 Remembrance circuit valve 35 Flow sensor 36 Bath circulation pump 37 Temperature sensor 40 Operation plan creation device 41 Clock means 42 Heat consumption measurement means 43 Heat consumption storage means 44 Heat consumption prediction means 45 Heat storage amount detection means 46 Heating time zone determination means 47 Boiling control means 51 Selection means 52 Heat supply amount calculation means 53 Heat dissipation loss calculating means 54 Insufficient heat quantity calculating means 55 Heating required time calculating means 56 Heating time zone setting means

Claims (7)

In a hot water storage type electric water heater provided with a hot water storage tank and an electric heater for supplying heat to the hot water storage tank, an operation plan creation device for determining a time zone for supplying heat by the electric heater,
Heat consumption measuring means for measuring the actual value of heat consumption in each time zone of the day;
Heat consumption storage means for storing the actual value of heat consumption measured by the heat consumption measurement means;
Based on the actual value of the heat consumption in each past time zone stored in the heat consumption storage means, the predicted heat consumption for each unit time zone from the present time to a predetermined time later (hereinafter referred to as “planned time zone”) is calculated. Means for predicting the amount of heat consumed;
A heat storage amount detecting means for measuring a heat storage amount of the hot water storage tank at the present time (hereinafter referred to as “initial heat storage amount”);
And a heat supply time zone determining means for determining a time zone for supplying heat to the hot water storage tank (hereinafter referred to as “heat supply time zone”) based on the initial heat storage amount and the predicted heat consumption amount of each unit time zone;
With
The heat supply time zone determining means is such that the amount of heat stored in the hot water storage tank does not fall below a predetermined threshold (hereinafter referred to as “minimum heat storage amount”) in the planned time zone, and the start time of the heat supply time zone is the longest. The operation plan creation device, wherein the heating time period is determined so as to be delayed. The heating time zone determining means is
Selection means for sequentially selecting each unit time zone of the planned time zone from the first unit time zone to the last unit time zone;
For the unit time zone selected by the selection means (hereinafter referred to as “selected time zone”), the hot water tank is supplied from the electric heater to the start time of the selected time zone from the start time of the planned time zone. Heat supply amount calculating means for calculating an integrated value of the amount of heat to be heated (hereinafter referred to as “integrated heat supply amount”);
An integrated value of predicted heat consumption from the first unit time zone of the planned time zone to the selected time zone (hereinafter referred to as “integrated predicted heat consumption”) is a value obtained by adding the integrated heat supply amount to the initial heat storage amount. When exceeding the value obtained by subtracting the minimum heat storage amount (hereinafter referred to as “surplus heat storage amount”), the insufficient heat amount for calculating a value (hereinafter referred to as “insufficient heat amount”) obtained by subtracting the marginal heat storage amount from the integrated predicted heat consumption amount. Calculating means;
A required heat supply time calculating means for calculating a required heat supply time by dividing the insufficient heat amount by a heat supply amount per unit time of the electric heater (hereinafter referred to as “heat supply speed”);
A time zone (hereinafter referred to as “supply time”) in which heat is supplied from the electric heater to the hot water storage tank for the required heating time within a time zone before a predetermined margin time width from the start time of the selected time zone. Heating time zone setting means for setting “thermal time zone”);
With
The heating time zone setting means is configured so that the newly set heating time zone does not overlap with the already set heating time zone and the start time of the newly set heating time zone is the latest. The operation plan creation device according to claim 1, wherein a heat supply time zone is set. The heating time zone determining means is
A heat dissipation loss calculating means for calculating a heat dissipation loss in the hot water storage tank from the start time of the planned time zone to the start time of the selected time zone,
The insufficient heat amount calculating means, when the integrated predicted heat consumption exceeds a value obtained by subtracting the heat dissipation loss from the margin heat storage amount (hereinafter referred to as “correction margin heat storage amount”), the correction margin from the total prediction heat consumption. The operation plan creation device according to claim 2, wherein a value obtained by subtracting a heat storage amount is calculated as the insufficient heat amount. In a hot water storage type electric water heater provided with a hot water storage tank and an electric heater for supplying heat to the hot water storage tank, an operation plan creation method for determining a time zone for supplying heat by the electric heater,
A heat consumption measuring step for measuring the actual value of the heat consumption in each time zone of the day and storing it in the heat consumption storage means;
Based on the actual value of the heat consumption in each past time zone stored in the heat consumption storage means, the predicted heat consumption for each unit time zone from the present time to a predetermined time later (hereinafter referred to as “planned time zone”) is calculated. Heat consumption prediction step to be performed;
A heat storage amount detection step for measuring the heat storage amount of the hot water storage tank at the present time (hereinafter referred to as “initial heat storage amount”);
And a heating time zone determination step for determining a time zone for heating the hot water storage tank (hereinafter referred to as a “heating time zone”) based on the initial heat storage amount and the predicted heat consumption amount of each unit time zone;
Have
In the heat supply time zone determination step, the heat storage amount of the hot water storage tank does not fall below a predetermined threshold (hereinafter referred to as “minimum heat storage amount”) in the planned time zone, and the start time of the heat supply time zone is The operation plan creation method, wherein the heating time period is determined so as to be slowest. In the heating time zone determination step,
A selection step of sequentially selecting each unit time zone of the planned time zone from the first unit time zone to the last unit time zone;
For the unit time zone selected in the selection step (hereinafter referred to as “selected time zone”), the hot water tank is supplied from the electric heater to the start time of the selected time zone from the start time of the planned time zone. A heat supply amount calculating step for calculating an integrated value of the amount of heat to be heated (hereinafter referred to as “integrated heat supply amount”);
An integrated value of predicted heat consumption from the first unit time zone of the planned time zone to the selected time zone (hereinafter referred to as “integrated predicted heat consumption”) is a value obtained by adding the integrated heat supply amount to the initial heat storage amount. When exceeding the value obtained by subtracting the minimum heat storage amount (hereinafter referred to as “surplus heat storage amount”), the insufficient heat amount for calculating a value (hereinafter referred to as “insufficient heat amount”) obtained by subtracting the marginal heat storage amount from the integrated predicted heat consumption amount. Calculation step;
A required heat supply time calculating step of calculating a required heat supply time by dividing the insufficient heat amount by a heat supply amount per unit time of the electric heater (hereinafter referred to as “heat supply speed”);
A time zone (hereinafter referred to as “supply time”) in which heat is supplied from the electric heater to the hot water storage tank for the required heating time within a time zone before a predetermined margin time width from the start time of the selected time zone. Heat supply time zone setting step for setting “heat time zone”;
Have
In the heating time zone setting step, the newly set heating time zone does not overlap with the already set heating time zone, and the start time of the newly set heating time zone is the latest. 5. The operation plan creation method according to claim 4, wherein a heat supply time zone is set. In the heating time zone determination step,
A heat dissipation loss calculating step of calculating a heat dissipation loss in the hot water storage tank from the start time of the planned time zone to the start time of the selected time zone,
In the insufficient heat amount calculation step, when the integrated predicted heat consumption exceeds a value obtained by subtracting the heat dissipation loss from the margin heat storage amount (hereinafter referred to as “corrected margin heat storage amount”), the correction is made from the total prediction heat consumption. 6. The operation plan creation method according to claim 5, wherein a value obtained by subtracting a marginal heat storage amount is calculated as the insufficient heat amount. A program that causes a computer to function as the operation plan creation device according to any one of claims 1 to 3 by being read into the computer and executed.

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