JP6544304B2 - Hot water storage type hot water heater - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a hot water storage type water heater.

  2. Description of the Related Art Conventionally, a storage water heater that widely stores hot water heated by heating means such as a heat pump in a hot water storage tank and uses hot water extracted from the hot water storage tank to hot water destinations such as a bathtub is widely used.

  For example, in Patent Document 1, the operation learning technology of a hot water storage type electric water heater capable of predicting the heat load by accurately integrating the past heat load results according to the life pattern of the user is disclosed. It is disclosed.

JP 2008-256270 A

  By the way, with the liberalization of retail power for household use in recent years, various power rate systems are expected to appear from each company. For example, when the amount of power generation in the daytime is increased due to the spread of solar power generation in the future, it may be considered that the power rate in the daytime time zone is set cheaper than the nighttime time zone. Generally, a storage-type water heater can obtain economic merits by performing a boiling operation in a time zone in which the unit price of the power rate is set inexpensively. For this reason, it is desirable to flexibly change the time zone in which the heating operation is performed according to the power rate system. However, it is necessary to consider the usage pattern of the hot water supply by the user during the heating operation time zone. This is because if the heating operation is not performed before the time zone in which the amount of use of the hot water supply by the user increases, it is likely that the hot water shortage will occur. Therefore, it will be an issue in the future to perform inexpensive boiling operation while preventing run out while flexibly dealing with various power rate systems and usage patterns by users expected in the future.

  The present invention has been made to solve the above-described problems, and flexibly copes with various power rate systems and usage patterns by users, and performs inexpensive boiling operation while preventing hot water breakage. It aims to provide a storage water heater that can

  A storage water heater according to the present invention comprises a storage tank, a heating unit for heating water, a boiling control unit for controlling a boiling operation for storing hot water heated by the heating unit in the storage tank, and a storage tank Based on the history of the information stored in the storage means, the storage means for storing the information on the amount of heat used for each time zone of the day, and the obtaining means for obtaining the amount of heat used which is the heat amount of hot water supplied with hot water The electricity charge is high based on the division means for dividing the time zone of the day into the first time zone where the amount of heat used is large and the second time zone where the amount of heat used is smaller than the first time zone and The system further comprises charge information acquisition means for acquiring a high charge time zone and a low charge time zone where the power charge is lower than the high charge time zone, and the boiling control means belongs to the second time zone and the low charge time zone Prioritizing time zones over other time zones, It is those configured to perform up operation can.

  According to the storage-type water heater of the present invention, the boiling operation in the time zone in which the amount of heat used is small and the power charge is low is prioritized. As a result, it is possible to provide a storage water heater capable of performing inexpensive boiling operation while preventing hot water, while flexibly dealing with various power rate systems and usage patterns by users.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the storage-type water heater of Embodiment 1. FIG. An example of time-based actuals of the amount of heat used and time-of-day information of power rates are shown. 6 is a flowchart showing a routine for the control device to calculate time zone data of heat consumption in the water storage type hot water supply apparatus of the first embodiment. 6 is a flowchart showing a routine for the control device to execute a heating operation in the hot water storage type hot water supply device of the first embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1
FIG. 1 is a block diagram showing the hot water storage type hot water supply apparatus of the first embodiment. As shown in FIG. 1, the hot water storage type water heater 50 of the first embodiment includes a tank unit 33 and a heat pump unit 7 configured to utilize a heat pump cycle. The heat pump unit 7 and the tank unit 33 are connected via the heat pump forward piping 14, the heat pump return piping 15, and an electrical wiring (not shown). In addition, the tank unit 33 incorporates a control device 36 that controls the operation of the hot water storage type water heater 50. The controller 36 is configured of, for example, a microcomputer. The control device 36 includes a storage unit as storage means including a ROM, a RAM, a non-volatile memory, etc., an arithmetic processing unit (CPU) that executes arithmetic processing based on a program stored in the storage unit, and an arithmetic processing unit. And an input / output port for inputting / outputting an external signal. The various valves, pumps, and sensors included in the tank unit 33 and the heat pump unit 7 are connected to the control device 36 through electrical wiring. The control device 36 is communicably connected to the external input / output device 35.

  The external input / output device 35 is for inputting various operation instructions for operating the hot water storage type hot water supply device, and notifying of the state of the hot water storage type water heater. In particular, the user can input various information from the external input / output device 35 when the storage type water heater is installed or when the power contract is changed. For example, the user can input time-based information on the power unit price provided by each contracted power company. In addition, the user can input information on the contracted power rate plan. In this case, the external input / output device 35 functions as a charge information acquisition unit that acquires the hourly information of the power charge.

  On the other hand, the control device 36 is connected to a HEMS (home energy management system) 70 by wire or wirelessly. Various information such as operation information or operation state of the water heater can be output to the Internet 100 via the HEMS 70 and used. Moreover, the information according to the time slot | zone of the power unit price of the power rate plan which the user input can be acquired from the internet 100 through HEMS70. In this case, the HEMS 70 functions as a charge information acquisition unit that acquires the time zone information of the power charge. According to such a system, it is possible to easily obtain power rate information by time zone without the user having to input the power rate unit details.

  Next, each component of the hot water storage type water heater 50 will be described. The heat pump unit 7 functions as a heating unit that heats the water introduced from the tank unit 33. The heat pump unit 7 forms a heat pump cycle by annularly connecting the compressor 1, the water refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 6 through the refrigerant circulation pipe 5. The water refrigerant heat exchanger 3 exchanges heat between the refrigerant and the water led from the tank unit 33.

  The tank unit 33 incorporates the following various components and piping. The hot water storage tank 8 forms a temperature stratification in which the upper side is high temperature and the lower side is low temperature, and the hot water is stored. A third water supply pipe 9c of a water supply pipe 9 for supplying low-temperature water, which is city water, is connected to the water inlet 8a provided at the lower part of the hot water storage tank 8. The water supply pipeline 9 will be described later. At the upper part of the hot water storage tank 8, a hot water introduction outlet 8d is provided. A hot water supply pipe 21 for supplying the hot water stored in the hot water storage tank 8 to the outside of the water heater is connected to the hot water introduction outlet 8 d. In the hot water storage tank 8, high temperature water heated using the heat pump unit 7 flows from the upper part of the tank, and low temperature water flows into the lower part of the tank via the third water supply pipe 9c. Hot and cold water is stored so that a temperature difference occurs at the lower part. In order to detect the temperature distribution of the hot and cold water in the hot water storage tank 8, a plurality of temperature sensors are installed on the surface of the hot water storage tank 8 at different heights. In the first embodiment, five temperature thermistors 41, 42, 43, 44, 45 are arranged so as to change in height from the upper region of the hot water storage tank 8 toward the lower region. The control device 36 grasps the amount of remaining hot water in the hot water storage tank 8, that is, the amount of boiling heat stored in the hot water storage tank 8, based on the temperature distribution acquired by these temperature thermistors attached to the hot water storage tank 8.

  Further, in the tank unit 33, the circulation pump 12 and the heat exchanger 20 for the bath are incorporated. The circulation pump 12 is a pump for circulating hot and cold water through various pipes described later. The bath heat exchanger 20 is a heat exchanger for heating the fluid to be heated on the secondary side using high temperature water supplied from the hot water storage tank 8 or the heat pump unit 7. In the first embodiment, as the configuration of the secondary side of the bottom heat exchanger 20, the downflow piping 27 and the bottom return piping 28 for circulating the hot and cold water in the bath 30 will be described as an example. The bath heat exchanger 20 is connected to the bath 30 via a blowout pipe 27 and a blowback pipe 28 to form a circulation path. A bath circulating pump 29 for circulating bath water and a bath return temperature thermistor 38 for detecting the temperature of the bath water discharged from the bath 30 are disposed in the middle of the bath return pipe 28. In the middle of the blowout pipe 27, a blowout temperature thermistor 37 for detecting the temperature of the bath water after heat exchange from the blow heat exchanger 20 is installed.

  Next, the valves and piping provided in the tank unit 33 will be described. The tank unit 33 has a three-way valve 11 and a four-way valve 18. The three-way valve 11 is a flow path switching unit having two ports, an inlet a and a port b, into which hot water flows, and a port c, one outlet from which hot water flows, and either a port or b port The route of the hot and cold water is configured to be switchable so that the hot and cold water flows in from there. The four-way valve 18 has two inlets b and c ports into which the hot water flows, and two outlets a and d from which the hot water flows out. The four-way valve 18 is configured to be able to switch the flow path configuration among four paths, that is, the ab path, the ac path, the bd path, and the cd path.

  In addition, the tank unit 33 includes the water outlet piping 10, the hot water supply piping 13, the first bypass piping 16, the second bypass piping 17, and the hot water introduction piping 20a and the hot water extraction piping 20b that constitute the heat source side circuit. have.

  The water outlet pipe 10 is a flow path connecting the water outlet 8 b of the hot water storage tank 8 and the a port of the three-way valve 11. The hot water supply pipe 13 is a flow path connecting the d port of the four-way valve 18 and the hot water inlet / outlet 8 d at the top of the hot water storage tank 8. The heat pump forward piping 14 described above is a flow path connecting the c port of the three-way valve 11 and the inlet side of the heat pump unit 7, and the heat pump return piping 15 is the outlet side of the heat pump unit 7 and the c port of the four way valve 18 It is a channel that connects the A circulation pump 12 is disposed in the middle of the heat pump forward piping 14. The first bypass pipe 16 is a flow path connecting the a port of the four-way valve 18 and the hot water inlet 8 c provided between the central portion and the lower portion in the height direction of the hot water storage tank 8. The second bypass pipe 17 is a flow path that branches from between the circulation pump 12 provided in the middle of the heat pump forward pipe 14 and the inlet side of the heat pump unit 7 and is connected to the b port of the four-way valve 18. The hot water introduction pipe 20 a is a flow path that branches off from the middle of the hot water supply pipe 13 and is connected to the primary side inlet of the heat exchanger 20 for bath. The hot water lead-out pipe 20 b is a flow path that connects the primary side outlet of the heat exchanger 20 for bath and the b port of the three-way valve 11.

  The tank unit 33 further includes a first water supply pipe 9a, a second water supply pipe 9b, a hot water supply mixing valve 22, a bath mixing valve 23, a first hot water supply pipe 24, and a second hot water supply pipe 25. One end of the first water supply pipe 9a is connected to a water source such as a water pipe, and the other end of the first water supply pipe 9a is connected to the second water supply pipe 9b and the third water supply pipe 9c via the pressure reducing valve 31. The water supply pipeline 9 is comprised by the 1st water supply piping 9a, the 2nd water supply piping 9b, and the 3rd water supply piping 9c. The second water supply pipe 9 b branches from the middle and is connected to the hot water supply mixing valve 22 and the bottom mixing valve 23. Further, the hot water supply pipe 21 is branched midway and connected to the hot water supply mixing valve 22 and the bath mixing valve 23 respectively. A solenoid valve 26 for opening and closing the second hot water supply pipe 25 is provided in the middle of the second hot water supply pipe 25.

  The hot water supply mixing valve 22 and the bath mixing valve 23 adjust the flow ratio of the high temperature water supplied from the hot water supply pipe 21 to the low temperature water supplied from the second water supply pipe 9 b. Thereby, the hot water of the set temperature set by the user is generated, and flows into the first hot water supply pipe 24 and the second hot water supply pipe 25 respectively. The hot water whose temperature has been adjusted by the hot water supply mixing valve 22 is supplied from the first hot water supply pipe 24 to a faucet such as a shower or currant not shown. On the other hand, the hot water whose temperature has been adjusted by the mixing valve 23 for bath is supplied from the second hot water supply pipe 25 to the bathtub 30 through the solenoid valve 26 for bathing, the forward pipe 27 and the return pipe 28.

  The tank unit 33 has a configuration as an acquisition unit that acquires the amount of used heat of hot water supplied from the hot water storage tank 8. More specifically, in the middle of the hot water supply pipe 21, a temperature thermistor 40 as a temperature detection means is disposed. Moreover, the temperature thermistor 39 as a temperature detection means is arrange | positioned in the middle of the 1st water supply piping 9a. Further, in the middle of the first hot water supply pipe 24, a flow rate sensor 49 as a flow rate detecting means is disposed. Further, a flow rate sensor 48 as a flow rate detecting means is disposed in the middle of the second hot water supply pipe 25. Further, the heat pump forward temperature thermistor 46 is a temperature sensor for detecting the temperature of water before it is heated by the water refrigerant heat exchanger 3, and is provided in the heat pump forward pipe 14. The heat pump return temperature thermistor 47 is a temperature sensor for detecting the temperature of the high temperature water heated by the water refrigerant heat exchanger 3, and is provided in the heat pump return pipe 15.

  The control device 36 of the hot water storage type water heater 50 shown in FIG. 1 has a function as a boiling control means for executing a boiling operation. The boiling operation is an operation of boiling the water in the hot water storage tank 8 using the heat pump unit 7. During the boiling operation, the heat pump unit 7 and the circulation pump 12 are operated. The three-way valve 11 is controlled so that the a port communicates with the c port and the b port is in the closed state. The four-way valve 18 is controlled such that the c port communicates with the d port and the a port and b port are in the closed state. In the boiling operation, the water drawn out from the water outlet 8b of the hot water storage tank 8 by the circulation pump 12 passes through the water outlet piping 10, the three-way valve 11, and the heat pump incoming piping 14 to heat the water refrigerant in the heat pump unit 7 It is sent to the switch 3. Then, high temperature water heated by the water refrigerant heat exchanger 3 in the heat pump unit 7 flows through the heat pump return pipe 15, the four-way valve 18, and the hot water supply pipe 13 and flows into the hot water storage tank 8 from the hot water inlet 8 d. By performing such a boiling operation, high temperature water is stored from the upper layer portion inside the hot water storage tank 8, and the high temperature water layer gradually becomes thick.

  Next, the characteristic operation of the hot water storage type hot water supply system 50 of the first embodiment will be described. There are two different requirements for the boiling operation. One of the requirements required for the boiling operation is the requirement from the electricity rate system. That is, in the power rate system, there are some in which different unit prices are set for each time zone. Boiling operation may be performed in the low charge time zone under the power charge system in which the low charge time zone where the power charge is cheap and the high charge time zone where the power charge is more expensive than the low charge time zone exist preferable.

  Also, another requirement for the boiling operation is a requirement from the user's usage of hot water. The usage condition of hot water supply changes with the life pattern of the user. For this reason, in order to prevent the user from running out of hot water due to the use of hot water, it is preferable to analyze the life pattern of the user and select a time zone in which the hot water is not used to perform the boiling operation.

  Therefore, in the hot water storage type water heater 50 according to the first embodiment, the time period during which the user is in the low charge time period and does not use the hot water supply is selected with priority and the heating operation is performed. FIG. 2 shows an example of the time-based actual results of the amount of heat used and the time-based information of the power rate. Hereinafter, the specific process of the control performed in the hot-water storage type water heater 50 of Embodiment 1 will be described by taking the hot water supply use shown in FIG. 2 as an example.

  FIG. 3 is a flow chart showing a routine for the control device 36 to calculate hourly data of the heat quantity used in the hot water storage type hot water supply apparatus of the first embodiment. First, with reference to FIG. 3, a specific process of calculating the hourly data of the used heat amount and the total used heat amount of one day will be described. In the following description, although the case where the power unit price by time zone is input by the user by the external input / output device 35 is described as an example, the case where the information is obtained from the HEMS 70 via the Internet 100 The same is true.

  In step S1 of the routine shown in FIG. 3, first, the power unit price information for each time zone input by the external input / output device 35 is stored in the storage unit of the control device 36. The electricity charge unit price information includes at least information of a low charge time zone in which the electricity charge unit price is lower than other time zones and a high charge time zone higher than the low charge time zone during one day. For example, in the example of the power charge information shown in FIG. 2, the low charge time zone is set from 6 to 18 o'clock of the day, and the power unit price is more expensive than the low charge time slot from 6 pm to 6 am It is set for high fare hours. Such a rate plan is considered, for example, when the amount of power generation by solar power generation increases and the daytime power becomes excessive.

  In the next step S2, the start time of the day is set. Here, for example, six o'clock when the electricity unit price changes is set as the start time of the day. Then, 24 hours from the set start time is set as the integration time of the heat consumption of one day, and the integrated value of the heat consumption is reset every 6 o'clock.

  In the next step S3, the amount of heat used after 6 o'clock is measured every specified time, for example, every one minute. Here, specifically, the amount of heat used for hot water supply is calculated via the first hot water supply pipe 24 based on the temperature and the flow rate detected by the temperature thermistors 39 and 40 and the flow rate sensor 49. Further, based on the temperature and the flow rate detected by the temperature thermistors 37, 38, 39 and 40 and the flow rate sensor 48, the amount of heat used for hot water supply is calculated via the second hot water supply pipe 25. Then, the total heat amount of the used heat amount used for hot water supply via the first hot water supply pipe 24 and the used heat amount used for hot water supply via the second hot water supply pipe 25 is calculated as the final used heat amount per minute . Next, the calculated use heat quantity per minute is integrated as a unit time zone for 2 hours.

  In the next step S4, it is determined whether 24 hours which is one day have passed. As a result, when it is determined that 24 hours have not passed yet, the process returns to the process of step S3 described above, and integration of the amount of heat used is continued. On the other hand, if it is determined in step S4 that 24 hours have elapsed, the process proceeds to the next step, and the heat quantity data for 24 hours a day is stored in the control device 36. For example, in the example shown in FIG. 2, the working heat quantity of the time zone of 6 to 8 o'clock is 1720 kcal, the working heat quantity of the time zone of 12 to 14 o'clock time band is 430 kcal, and the working heat quantity of the time zone of 24 to 2 o'clock is 1720 kcal And, the working heat quantity of the time zone of 4 to 6 o'clock is 8600 kcal. The total amount of heat used is 12470 kcal = 14.5 KW.

  Next, specific processing of the boiling operation performed in the hot water storage type hot water supply apparatus of the first embodiment will be described. FIG. 4 is a flowchart showing a routine for the control device 36 to execute the heating operation in the hot water storage type water heater 50 of the first embodiment. In step S6 of the routine shown in FIG. 4, first, unit price information for each time zone of the power rate inputted by the external input / output device 35 is read. In the example shown in FIG. 2, the time zone from 6 o'clock to 18 o'clock is set as the low fee time zone, and from 18 o'clock to the next 6 o'clock is set as the high fare time zone.

  In the next step S7, a history of information related to the amount of heat used by the past time zone is called from the storage unit of the control device 36. Here, specifically, for example, the used heat quantity according to the time zone of the previous day is used. Moreover, you may use each average value of the used calorie | heat amount according to the time slot | zone of two weeks as a predetermined period of time as a used calorie | heat amount according to time slot | zone, for example. Then, assuming that the used heat amount required on the next day is equal to the past used heat amount for the called time zone, the used heat amount for the next day is specified.

  In the next step S8, the use heat quantity of the next day assumed from the past use heat quantity is classified according to the magnitude of the use heat quantity. For example, in the case of a user who lives at night, the amount of heat used at night is greater than that at daytime, so the life pattern appears as the amount of heat used. Here, specifically, depending on whether the heat quantity used next day by time zone is less than the reference heat quantity set in advance, the first time zone where the heat quantity used is large and the heat quantity used are less than the first time zone It is divided into two time zones. In this case, the control device 36 functions as a division unit that divides the daily use heat amount into a first time zone and a second time zone. In the example of FIG. 2, the reference heat amount is set to 860 kcal. The second time zone from 2 o'clock to 4 o'clock and the second time zone from 8 o'clock to 24 o'clock when the heat quantity used is less than 860 kcal are classified as a time zone A in which the hot water supply is not used.

  In the next step S9, the time zone B which is the time zone A where the hot water supply is not used and which is the low charge time zone is specified. Then, the total daily time T1 of the time zone B is calculated. In the example shown in FIG. 2, the time zone B is a time zone from 8:00 to 18:00, and the total time T1 is 10 hours.

In the next step S10, it is determined whether the total time T1 is equal to or longer than the required boiling time T2. The necessary boiling time T2 is the execution time of the boiling operation required to store the heat amount for covering the daily use heat amount in the hot water storage tank 8. Here, for example, assuming that the heating capacity of the heat pump unit 7 is 4.5 KW and the heating efficiency is 0.95, the necessary boiling time T2 necessary for storing 14.5 KW of heat used per day in the hot water storage tank 8 is next It is calculated as equation (1).
T2 = 14.5 / (4.5 × 0.95) ≒ 3.39 (h) (1)

  If it is determined in step S10 that the total time T1 is equal to or longer than the required boiling time T2, the process proceeds to the next step. In the next step S12, the boiling operation is performed in the total time T1. In the next step S13, the amount of boiling heat stored in the hot water storage tank 8 by the boiling operation is calculated based on the temperature in the hot water storage tank detected by the temperature thermistors 41 to 45. Then, in the next step S14, it is determined whether or not the daily use heat amount, which is the target value of the boiling heat amount, is stored in the hot water storage tank 8. Here, specifically, it is determined whether the boiling heat amount calculated in step S13 has reached the daily use heat amount. As a result, if the boiling heat amount has not reached the daily use heat amount, the process of step S13 is executed again. On the other hand, if the boiling heat amount has reached the daily use heat amount, the process proceeds to the next step S15, and the boiling operation is ended.

  If it is determined in step S10 that the total time T1 is less than the required boiling time T2, the process proceeds to the next step 16. In the next step S16, the condition of the boiling operation is changed in order to compensate for the shortage of the required boiling time T2. In addition, in the boiling operation, it belongs to a first time zone which is a time zone using hot water supply and a low charge time zone rather than a time zone belonging to a second time zone which is a time zone not using hot water supply and a high charge time zone. It is preferred that the time zone be prioritized. Therefore, here, specifically, the conditions are changed such that a part of the time zone C which is continuous with the time zone B and which is the low charge time zone is the time zone in which the heating operation is performed. In the example shown in FIG. 2, the time zone from 6 o'clock to 8 o'clock is the time zone C. When the process of step S16 is executed, the process returns to step S9, and a part of the time zone C is added to the total time T1. Then, the determination in step S10 is performed again, and if the total time T1 is less than the required boiling time T2, the process proceeds to step S16 again. Such an operation is repeated until the total time T1 becomes equal to or more than the required heating time T2.

In the step S16, the condition of the heating capacity of the heat pump unit 7 may be changed to a larger value. Such an operation is effective especially when the required boiling time T2 is insufficient even when the time zone C is added. However, when the heating capacity of the heat pump unit 7 is increased, an increase in operating noise of the boiling operation or a decrease in heating efficiency may occur. However, in the example shown in FIG. 2, since the boiling operation is performed in the daytime time zone, it is not necessary to care about the driving noise as in the nighttime. In addition, even if the heating efficiency is lowered, if it is possible to compensate for the shortage of the necessary boiling time T2 in the low charge time zone, it is possible to enjoy economic merits. For example, when the heating capacity of the heat pump unit 7 is changed from the usual 4.5 KW to 6 KW, and the heating efficiency decreases from 0.95 to 0.9, the required boiling time T2 is calculated as in the following formula (2) Be done. In this case, since the total time T1 may be 2.69 (h) or more, it is possible to increase the possibility that the required boiling time T2 falls within the total time T1.
T2 = 14.5 / (6 × 0.9) ≒ 2.69 (h) (2)

  As described above, according to the hot water storage type water heater 50 of the first embodiment, the boiling operation in the time zone in which the amount of heat used is small and the power rate is low is prioritized. As a result, it is possible to provide a storage water heater capable of performing inexpensive boiling operation while preventing hot water, while flexibly dealing with various power rate systems and usage patterns by users.

  The control device 36 provided in the hot water storage type water heater 50 according to the first and second embodiments may be configured as follows. Each function of the control device may be realized by a processing circuit. The processing circuitry of the controller may comprise at least one processor and at least one memory. When the processing circuit includes at least one processor and at least one memory, each function of the control device may be realized by software, firmware, or a combination of software and firmware. Software and / or firmware may be described as a program. At least one of the software and the firmware may be stored in at least one memory. At least one processor may implement each function of the control device by reading and executing a program stored in at least one memory. At least one memory may include non-volatile or volatile semiconductor memory, magnetic disk, and the like.

  The processing circuitry of the controller may comprise at least one dedicated hardware. When the processing circuit comprises at least one dedicated hardware, the processing circuit may, for example, be a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit (ASIC), an FPGA (field- It may be a programmable gate array) or a combination thereof. The function of each part of the control device may be realized by the processing circuit. In addition, the functions of the respective units of the control device may be realized collectively by the processing circuit. For each function of the control device, a part may be realized by dedicated hardware, and another part may be realized by software or firmware. The processing circuit may implement each function of the control device by hardware, software, firmware, or a combination thereof.

Reference Signs List 7 heat pump unit, 8 hot water storage tank, 33 tank unit, 35 external input / output device, 36 control device, 37, 38, 39, 40, 41, 42, 43, 44, 45 temperature thermistor, 48, 49 flow sensor, 50 hot water storage Water heater, 70 HEMS, 100 Internet

Claims (6)

With a hot water storage tank,
Heating means for heating water;
Boiling control means for controlling a boiling operation of storing the hot water heated by the heating means in the hot water storage tank;
Obtaining means for obtaining a used heat amount which is a heat amount of hot water supplied from the hot water storage tank;
Storage means for storing information on the amount of heat used according to the time of day;
Based on the history of the information stored in the storage means, the time zone of the day is divided into a first time zone where the amount of heat used is large and a second time zone where the amount of heat used is smaller than the first time zone Means for sorting
The system further comprises charge information acquisition means for acquiring a high charge time zone having a high power charge and a low charge time zone in which the power charge is lower than the high charge time slot, based on the power charge hourly information.
The boiling control means is
A hot water storage type hot water storage apparatus characterized in that the boiling operation is performed with priority given to a time zone belonging to the second time zone and the low charge time zone over other time zones.   The sorting means divides the time zone in which the average value of the past history of the heat usage amount is equal to or higher than the reference heat energy into the first time zone, and sets the time zone in which the average value is less than the reference heat energy as the second time zone The hot water storage type hot water heater according to claim 1, which is configured to be divided.   The boiling control means calculates a target value of the boiling amount, which is the amount of heat to be boiled per day, based on the history of the information stored in the storage means, and the boiling amount corresponds to the target value. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the boiling operation is performed so as to become.   The boiling control means performs the boiling operation by giving priority to the low charge time zone and the time zone belonging to the first time zone over the time zone belonging to the second time zone and the high charge time zone The hot water storage type water heater according to any one of claims 1 to 3, which is configured as described above.   The boiling control means is configured to set the second time zone and the low time when the boiling amount does not reach the target value in the boiling operation in the second time zone and a time zone belonging to the low fee time zone. The hot water storage type hot water supply apparatus according to claim 3, characterized in that the boiling operation is performed continuously with a time zone belonging to a charge time zone and in a time zone belonging to the low charge time zone.   The boiling control means increases the heating capacity of the heating means when the boiling amount does not reach the target value in the boiling operation in the second time zone and the time zone belonging to the low fee time zone The hot water storage type hot water supply apparatus according to claim 3, wherein the boiling operation is performed in a time zone belonging to the second time zone and the low charge time zone.

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