JP2020067196A - Hot water system - Google Patents

Abstract

To provide a technology capable of setting a boiling-up set temperature or/and a boiling-up set amount suitable for an actual hot water demand about each of a plurality of scheduled times of use.SOLUTION: A controller can estimate a plurality of scheduled times of use on the day on the basis of a past operation history, and execute learning control for operating a heat pump at a heat pump operation time being a time before the scheduled time of use only by a predetermined time about each of the plurality of scheduled times of use. In the case of executing the learning control, the controller acquires expected air temperature information showing an expected air temperature at the scheduled time of use about each of the plurality of scheduled times of use, and corrects the value of at least one between the boiling-up set temperature and the boiling-up set amount in accordance with difference between the expected air temperature shown by the expected air temperature information and a reference temperature at the scheduled time of use about each of the plurality of scheduled times of use.SELECTED DRAWING: Figure 3

Description

  The technique disclosed in this specification relates to a hot water supply system.

  Patent Document 1 discloses a heat pump that absorbs heat from a natural environment, a tank that stores water heated by the heat pump, a supply path that supplies hot water in the tank to a hot water supply location, and a combustion device that heats water by burning gas. , A hot water supply system including a controller is disclosed. In this hot water supply system, the controller acquires the expected temperature information indicating the expected temperature of the day, and when the expected temperature of the day indicated by the obtained predicted temperature information is higher than the preset reference temperature, it is stored in the tank. Lower the boiling temperature, which is the temperature of water.

JP, 2018-84377, A

  In the technique of Patent Document 1, the predicted temperature compared with the preset reference temperature is a constant value, such as the predicted maximum temperature (or predicted average temperature, predicted minimum temperature) of the day. However, in the environment where the hot water supply system is actually used, the temperature may change greatly depending on the time of day even in the same day. Therefore, in the case of the technique of Patent Document 1, even if the controller compares the expected temperature of the day (that is, the estimated maximum temperature, etc.) with the reference temperature and sets the boiling set temperature based on the result, the hot water is not actually supplied. There is a possibility that a divergence may occur between the temperature at the start time and the predicted temperature. In that case, even if the heat pump is operated based on the set boiling temperature and the water at the boiling set temperature is stored in the tank, the hot water supply demand cannot be sufficiently covered or the excess water supply demand is exceeded. There is a possibility that hot water will be boiled.

  That is, according to the technique of Patent Document 1, a difference may occur between the temperature at the time when hot water supply is actually started and the expected temperature, and the set boiling temperature may not meet the actual hot water supply demand. .

  The present specification provides a technique capable of setting a boiling set temperature or / and a set boiling amount suitable for actual hot water supply demand for each of a plurality of scheduled use times.

  The hot water supply system disclosed in the present specification includes a heat pump that absorbs heat from a natural environment, a tank that stores water heated by the heat pump, a supply path that supplies the water in the tank to a hot water supply location, and a water supply by gas combustion. Combustion device for heating the, and comprising a controller, the controller stores each time when hot water supply was started on each day within a predetermined period in the past, and stores an operation history indicating the amount of hot water supply at each hot water supply timing, Based on the operation history, a plurality of scheduled use times on the day are estimated, and for each of the plurality of scheduled use times, the heat pump is operated at a heat pump operating time that is a predetermined time before the scheduled use time. It is possible to execute learning control in which the hot water of the boiling set temperature is operated and stored in the tank by the boiling set amount. In the case of executing the learning control, the controller acquires, for each of the plurality of scheduled use times, expected temperature information indicating an expected temperature at the scheduled use time, and obtains each of the plurality of scheduled use times. With respect to, the value of at least one of the boiling set temperature and the boiling set amount is corrected according to the difference between the predicted temperature and the reference temperature indicated by the predicted temperature information at the scheduled use time.

  According to the above configuration, when performing the learning control, the hot water supply system, for each of the plurality of scheduled use times, sets the boiling temperature or / or the boiling temperature according to the difference between the predicted temperature and the reference temperature at the scheduled use times. And the boiling setting amount can be set. Therefore, according to the above configuration, the hot water supply system can set the boiling set temperature and / or the boiling set amount that match the actual hot water supply demand for each of the plurality of scheduled use times. Therefore, it is possible to suppress excessive storage of boiled water in the tank and to reduce the frequency of using the combustion device, so that energy efficiency can be improved.

  The reference temperature may be a temperature specified based on an air temperature at a time corresponding to the scheduled use time on each day in the past predetermined period.

  According to this configuration, the reference temperature reflects the actual value of the temperature at the time corresponding to the scheduled use time on each day in the past predetermined period. Therefore, as compared with the case where the reference temperature is a fixed value, a value that is closer to the actual use environment can be used as the reference temperature. Therefore, according to the above configuration, the hot water supply system can more appropriately set the boiling set temperature or / and the boiling set amount suitable for the actual hot water supply demand for each of the plurality of scheduled use times. It can also improve energy efficiency.

The figure which shows the structure of the hot water supply system 2 typically. The figure which shows typically the time zone when hot water is supplied in a specific household. The flowchart which shows the setting process in 1st Example. The flowchart which shows a 1st heat pump operation process. The flowchart which shows a 2nd heat pump operation process. The flowchart which shows a hot water filling process. The flowchart which shows the setting process in 2nd Example.

(First embodiment)
As shown in FIG. 1, the hot water supply system 2 according to the present embodiment includes a tank 10, a tank water circulation path 20, a tap water introduction path 30, a supply path 40, a heat pump 50, a combustion device 60, and a controller 100. And The controller 100 is connected to the network 4.

  The heat pump 50 is a heat source that absorbs heat from the outside air which is a natural environment and heats the water in the tank water circulation path 20. Although not shown, the heat pump 50 includes a refrigerant circulation path that circulates a refrigerant (alternative CFC, such as R410A), an evaporator that performs heat exchange between outside air and the refrigerant, and a compressor that compresses the refrigerant to a high temperature and high pressure. A condenser, a condenser for exchanging heat between the water in the tank water circulation passage 20 and the high-temperature and high-pressure refrigerant, and an expansion valve for decompressing the refrigerant after the heat exchange to lower the temperature and pressure. There is. Further, the heat pump 50 is provided with an outside air temperature sensor 52 that measures the outside air temperature.

  The tank 10 stores water heated by the heat pump 50. The tank 10 is a hermetically sealed type, and the outside is covered with a heat insulating material. Water is stored in the tank 10 until it is full. In this embodiment, the capacity of the tank 10 is 100L. The thermistors 12, 14, 16, 17, and 18 are attached to the tank 10 at predetermined intervals in the height direction of the tank 10. Each thermistor 12, 14, 16, 17, 18 measures the temperature of the water at its mounting position. For example, each of the thermistors 12, 14, 16, 17, and 18 measures the temperature of water at a position of 6L, 12L, 30L, 50L, and 70L from the upper portion of the tank 10, respectively.

  The tank water circulation path 20 has an upstream end connected to a lower portion of the tank 10 and a downstream end connected to an upper portion of the tank 10. A circulation pump 22 is interposed in the tank water circulation passage 20. The circulation pump 22 sends the water in the tank water circulation passage 20 from the upstream side to the downstream side. Further, the tank water circulation path 20 passes through a condenser (not shown) of the heat pump 50. Therefore, when the heat pump 50 is operated, the water in the tank water circulation passage 20 is heated by the condenser of the heat pump 50. Therefore, when the circulation pump 22 and the heat pump 50 are operated, the water in the lower part of the tank 10 is heated by the heat pump 50, and the heated water is returned to the upper part of the tank 10. That is, the tank water circulation path 20 is a water path for storing heat in the tank 10. Further, a thermistor 24 is provided on the upstream side of the heat pump 50 in the tank water circulation path 20. The thermistor 24 is led out from the lower part of the tank 10 and measures the temperature of water before passing through the heat pump 50. The thermistor 24 may be provided in the tank water circulation passage 20 closer to the heat pump 50 than the circulation pump 22, or may be provided in the tank water circulation passage 20 closer to the tank 10 than the circulation pump 22. .

  The tap water introduction path 30 has an upstream end connected to a tap water supply source 31. A thermistor 32 is provided in the tap water introduction passage 30. The thermistor 32 measures the temperature of tap water. The downstream side of the tap water introduction passage 30 branches into a first introduction passage 30a and a second introduction passage 30b. The downstream end of the first introduction path 30a is connected to the lower portion of the tank 10. The downstream end of the second introduction path 30b is connected in the middle of the supply path 40. A mixing valve 42 is provided at a connection portion between the downstream end of the second introduction passage 30b and the supply passage 40. The mixing valve 42 adjusts the amount of water mixed in the second introduction passage 30b with the water flowing in the supply passage 40.

  The upstream end of the supply path 40 is connected to the upper portion of the tank 10. A combustion device 60 is provided in the supply passage 40 on the downstream side of the connection portion with the second introduction passage 30b. Further, a thermistor 44 is interposed in the supply passage 40 downstream of the combustion device 60. The thermistor 44 measures the temperature of the supplied water. The combustion device 60 heats water by burning the fuel gas. The combustion device 60 heats the water in the supply passage 40 so that the temperature of the water measured by the thermistor 44 matches the hot water supply set temperature. The downstream end of the supply path 40 is connected to a hot water supply location (for example, a kitchen runner or a bathtub).

  The controller 100 is electrically connected to each component and controls the operation of each component. The controller 100 is also connected to the network 4. The network 4 is, for example, the Internet. The controller 100 acquires predicted temperature information indicating the predicted temperature for each time zone of the day and actual temperature information indicating the temperature for each time zone of the past seven days from an external server (not shown) via the network 4. You can

  Next, the operation of the hot water supply system 2 of this embodiment will be described. The hot water supply system 2 can execute a boiling operation and a hot water supply operation. Hereinafter, each operation will be described.

(Boiling operation)
The boiling operation is an operation of heating the water in the tank 10 with the heat generated by the heat pump 50. When the controller 100 instructs execution of the boiling operation, the heat pump 50 operates and the circulation pump 22 rotates. When the circulation pump 22 rotates, the water in the tank 10 circulates in the tank water circulation passage 20. That is, the water existing in the lower part of the tank 10 is introduced into the tank water circulation path 20, and when the introduced water passes through the condenser in the heat pump 50, it is heated by the heat of the heat medium, and the heated water is It is returned to the upper part of the tank 10. As a result, high temperature water is stored in the tank 10. A high-temperature water layer is formed on the upper portion of the tank 10, and a low-temperature water layer is formed on the lower portion.

(Hot water operation)
The hot water supply operation is an operation of supplying water having a hot water supply set temperature to a hot water supply location. Further, in particular, the hot water supply operation in the case where the hot water supply location is the bathtub will be referred to as “water filling operation” below. The hot water supply operation can be executed even during the above boiling operation. When the hot water tap at the hot water supply location is opened, the controller 100 causes tap water to flow from the tap water introduction passage 30 (first introduction passage 30a) into the lower portion of the tank 10 due to the water pressure from the tap water supply source 31. At the same time, the water in the upper part of the tank 10 is supplied to the hot water supply location via the supply path 40.

  When the temperature of the water supplied from the tank 10 to the supply path 40 (that is, the temperature measured by the thermistor 12) is higher than the hot water supply set temperature, the controller 100 opens the mixing valve 42 and supplies the water from the second introduction path 30b. Tap water is introduced into the passage 40. Therefore, the water supplied from the tank 10 and the tap water supplied from the second introduction path 30b are mixed in the supply path 40. The controller 100 adjusts the opening degree of the mixing valve 42 so that the temperature of the water supplied to the hot water supply location matches the hot water supply set temperature. On the other hand, controller 100 operates combustion device 60 when the temperature of the water supplied from tank 10 to supply path 40 is lower than the hot water supply set temperature. Therefore, the water passing through the supply passage 40 is heated by the combustion device 60. The controller 100 controls the output of the combustion device 60 so that the temperature of the water supplied to the hot water supply location matches the hot water supply set temperature.

(Learning control)
In this embodiment, the controller 100 estimates the time when hot water supply is expected to start in the specific household by using the driving history of the specific household for the past 7 days, and supplies the hot water at that time. The learning control is mainly performed by preliminarily operating the heat pump 50 so as to start it and storing necessary high-temperature water (hereinafter sometimes referred to as “hot water”) in the tank 10. The learning control in this embodiment will be described below.

  FIG. 2 is a diagram schematically showing a time zone in which hot water is supplied to a specific household during a certain day. In this embodiment, 24 hours starting from 2:00 is set as a unit time for identifying one day.

  Generally, for example, hot water is first supplied from 6:00 to 7:00 (6:00 in the example of FIG. 2). The first hot water supply is, for example, hot water supply for preparing breakfast or washing. In the first hot water supply, hot water of about 5 L to 20 L is supplied. After that, for example, the hot water is supplied for the second time from 11:00 to 12:00 (11:00 in the example of FIG. 2). The second hot water supply is, for example, hot water supply for preparing lunch. Even in the second hot water supply, hot water of about 5 L to 20 L is supplied. After that, for example, the hot water is supplied for the third time at 20:00 (20:00 in the example of FIG. 2). The third hot water supply is the operation of filling the bathtub. In the filling operation, hot water of about 150 L to 180 L is supplied. Then, for example, the last hot water supply is performed from 23:00 to 0:00 (about 23:00 in the example of FIG. 2). The last hot water supply is, for example, hot water supply for brushing teeth. At the last hot water supply, hot water of about 5 L to 10 L is supplied. The last hot water supply ends at about 0:00. Until each of the above-mentioned 6:00 to 7:00, 11:00 to 12:00, and 20:00 to the end of the filling operation, from 23:00 to 0:00 (that is, the time when each hot water supply is started. From the time until the end of hot water supply) is an example of “each hot water supply timing”.

  In the present embodiment, the controller 100 indicates time information indicating the time when hot water supply is started and the time when hot water supply is finished, and the amount of hot water supplied, every time hot water is supplied to a specific household. The supply amount information is stored. The controller 100 stores one-day time information and supply amount information as one-day operation history of a specific household. In this embodiment, the controller 100 stores the driving history for the past 7 days of a specific household. Therefore, the controller 100 erases the operation history of 8 days ago and newly stores the operation history of the previous day every 24 hours (every time becomes 2:00).

(Processing performed by the controller 100 every 24 hours)
A process executed every 24 hours when the controller 100 of the present embodiment executes the learning control will be described. Controller 100 starts the setting process shown in FIG. 3 when 2:00 (that is, 2:00 am), which is the starting time of day in hot water supply system 2, arrives.

(Setting process)
FIG. 3 is a flowchart showing the contents of the setting process executed by the controller 100. As described above, when 2:00 comes, the controller 100 starts the setting process shown in FIG. First, in S10, the controller 100 estimates a plurality of scheduled use times and one scheduled end time from the stored driving history of the specific household for the past 7 days.

  Specifically, in S10, the controller 100 executes the following processes. First, the controller 100 estimates the earliest time of the first hot water supply start of the day in the past 7 days as the “initial hot water supply start scheduled time S1”. For example, the controller 100 estimates 6:00 as the scheduled hot water supply start time S1 (see FIG. 2).

  Next, the controller 100 estimates the earliest time among the times when the hot water filling operation is started in the last 7 days from the driving history of the specific household for the last 7 days as the "water filling start scheduled time B1". . As described above, in this embodiment, the specific household is preset to start the water filling operation every day at 20:00. For example, the controller 100 estimates 20:00 as the scheduled filling time B1 (see FIG. 2).

  That is, in this example, the controller 100 estimates the initial hot water supply start scheduled time S1 and the hot water filling start scheduled time B1 as "plurality of scheduled use times" in S10. That is, in this embodiment, the controller 100 estimates two scheduled use times in S10. In another example, the controller 100 may estimate three or more scheduled use times in S10.

  Further, in S10, the controller 100 estimates, from the driving history for the past 7 days of the specific household, the latest time of the last hot water supply end in the last 7 days as the "scheduled end time G1". . For example, the controller 100 estimates 0:00 as the scheduled end time G1 (see FIG. 2).

  Next, in S12, the controller 100, in S10, the heat pump operating time corresponding to each of the plurality of scheduled use times estimated in S10 (that is, the initial hot water supply start scheduled time S1 and the hot water filling start scheduled time B1). The heat pump stop time corresponding to the estimated scheduled end time G1 is specified.

  Specifically, first, controller 100 identifies a first heat pump operating time S0 that is a time that is a first predetermined time α before scheduled hot water supply start time S1. In the present embodiment, the controller 100 starts a first heat pump operation process (see FIG. 4) described later when the first heat pump operation time S0 arrives.

  In addition, the controller 100 specifies the second heat pump operating time B0, which is a time that is the second predetermined time β before the scheduled start time B1 of the filling. In the present embodiment, when the second heat pump operating time B0 arrives, the controller 100 starts a second heat pump operating process (see FIG. 5) described later.

  Further, controller 100 specifies heat pump stop time G0 that is a time that is a third previous time γ before scheduled hot water supply end time G1. In the present embodiment, when the heat pump stop time G0 arrives, the controller 100 starts the heat pump stop processing described later.

  When the controller 100 specifies the above times S0, B0, and G0 in S12, the controller 100 proceeds to S14. In S14, the controller 100 supplies hot water at each of the scheduled use times (that is, the scheduled start time S1 of the initial hot water supply and the scheduled start time B1 of the hot water filling) estimated in S10 from the driving history of the past seven days of the specific household. Calculate demand.

  Specifically, in S14, the controller 100 determines the hot water supply demand at the first hot water supply start scheduled time S1 from the operation history for the past 7 days to the start of the hot water filling in the past 7 days from the time when the first hot water supply is started. The maximum amount of hot water supplied is specified. Hereinafter, this amount of hot water will be referred to as “first hot water supply amount Q”. For example, the controller 100 specifies 30L as the first hot water supply amount Q1. Further, the controller 100 determines, as the hot water supply demand at the scheduled hot water filling start time B1, the largest amount of hot water among the hot water amounts supplied during the hot water filling operation in the last 7 days from the operation history for the last 7 days. Identify. Hereinafter, the amount of hot water is referred to as "second hot water supply amount Q2". For example, the controller 100 specifies 180L as the second hot water supply amount Q2. The specified first hot water supply amount Q1 and second hot water supply amount Q2 may be collectively referred to as "hot water supply amount Q". Further, in the present embodiment, in S14, the controller 100 calculates the hot water supply demand based on only the amount of hot water supplied, but in another example, the controller 100 calculates the temperature and amount of hot water supplied. It may be calculated based on.

  In subsequent S16, the controller 100 determines the primary set temperature Ts1 at each of the scheduled use times estimated in S10 (that is, the initial hot water supply start scheduled time S1 and the hot water filling start scheduled time B1) based on the calculated hot water supply demand. And the primary set amount As1 is specified.

  Here, the "primary set temperature Ts1" means the boiling water set temperature for operating the heat pump 50 for each scheduled use time estimated in S10 (that is, the setting of hot water after being heated by the heat pump 50). Temperature) is a primary setting value. Further, the "primary set amount As1" means the boiling water set amount when the heat pump 50 is operated for each scheduled use time estimated in S10 (that is, it should be heated by the heat pump 50 and stored in the tank 10). This is the primary set value of the hot water set amount). In this embodiment, the value of the primary set temperature Ts1 is common (for example, 45 ° C.) among all the scheduled use times estimated in S10. In another example, the value of the primary set temperature Ts1 may be different for each scheduled use time.

  The value of the primary set amount As1 is specified based on the hot water supply amount Q specified in S14 and the capacity of the tank 10. As for the value of the primary set amount As1, when the hot water supply amount Q is larger than the capacity of the tank 10, the capacity of the tank 10 is specified as the primary set amount As1, and the hot water supply amount Q is larger than the capacity of the tank 10. When the amount is small, the hot water supply amount Q1 is specified as the primary set amount As1. Therefore, in the present embodiment, the primary setting amount As1 for the initial hot water supply start scheduled time S1 is “30L” which is the same as the first hot water supply amount Q1 (30L), and the primary setting for the hot water filling start scheduled time B1. The quantity As1 is specified as “100 L” which is the capacity of the tank 10. In addition, in another example, the value of the primary set amount As1 may be a fixed value.

  Next, in S18, the controller 100 indicates, from an external server (not shown) via the network 4, expected temperature information indicating the expected temperature for each time zone of the current day and the temperature for each time zone of the past 7 days. Acquires actual temperature information. In another example, in S18, the controller 100 determines, via the network 4, the predicted temperature information indicating the predicted temperature of the day at each scheduled use time estimated in S10 and the scheduled use times estimated in S10. You may make it acquire the actual temperature information which shows the estimated temperature of each day of the past 7 days in the corresponding time.

  In subsequent S20, the controller 100 identifies one scheduled use time among the plurality of scheduled use times estimated in S10. Hereinafter, the one scheduled use time specified in S20 may be referred to as a "specific scheduled use time". In the present embodiment, the controller 100 specifies the first hot water supply start scheduled time S1 as the "specific scheduled use time" in the first S20.

  Subsequently, in S22, the controller 100 determines that the predicted temperature T1 at a specific scheduled use time (for example, 6:00 that is the first scheduled hot water supply start time) is at a time (for example, 6:00) corresponding to the specific scheduled use time. It is determined whether or not the temperature is equal to or lower than the temperature obtained by subtracting a predetermined threshold Th1 from the average temperature T2 for the past 7 days. The predicted temperature T1 at a specific scheduled time of use (hereinafter sometimes simply referred to as “predicted temperature T1”) is specified based on the predicted temperature information acquired in S18. The average temperature T2 of the past seven days at a time corresponding to the specific scheduled use time (hereinafter may be simply referred to as “average temperature T2”) is calculated based on the actual temperature information acquired in S18. In the present embodiment, the threshold Th1 is a predetermined fixed value (for example, 5 ° C.). The threshold value Th1 is a value for correcting the value of the average temperature T2 that is compared with the predicted temperature T1. In a modified example, the threshold Th1 may be a variation value that varies according to the value of the average temperature T2.

  When the predicted temperature T1 is equal to or lower than the temperature obtained by subtracting the threshold Th1 from the average temperature T2, the controller 100 determines YES in S22, and proceeds to S24. When YES is determined in S22, the expected temperature T1 is significantly lower (for example, 5 ° C. or more) than the average temperature T2. In this case, more hot water demand is expected compared to the same time zone in the past 7 days. On the other hand, when the predicted temperature T1 is higher than the temperature obtained by subtracting the threshold Th1 from the average temperature T2, the controller 100 determines NO in S22, and proceeds to S26.

  In S24, the controller 100 specifies the temperature obtained by adding the correction value A1 to the primary set temperature Ts1 specified for the specific scheduled use time as the boiling set temperature Ts2 corresponding to the specific scheduled use time, and The primary setting amount As1 specified for the scheduled use time is directly specified as the boiling setting amount As2. Here, the "boiling set temperature Ts2" is the final set value of the boiling set temperature of the hot water when the heat pump 50 is operated for a specific scheduled time. The correction value A1 is a fixed value (for example, 2 ° C.). In another example, the correction value A1 may be a variation value in which the correction value A1 increases as the difference between the predicted temperature T1 and the average temperature T2 increases. That is, the boiling set temperature Ts2 specified in S24 is the temperature obtained by increasing the primary set temperature Ts1 by the correction value A1. The "boiling set amount As2" is the final set value of the boiling set amount of hot water when the heat pump 50 is operated for a specific scheduled use time. In the present embodiment, the boiling set amount As2 is the same as the primary set amount As1. Therefore, by performing the process of S24, the boiling set temperature Ts2 (for example, 47 ° C.) higher than the primary set temperature Ts1 (for example, 45 ° C.) by the correction value A1 in the tank 10 at the specific scheduled use time. It becomes possible to store the same boiling water set amount As2 (for example, 30 L) as the primary set amount As1. When S24 ends, the process proceeds to S32.

  On the other hand, in S26, the controller 100 determines whether the predicted temperature T1 is equal to or higher than the temperature obtained by adding the predetermined threshold Th2 to the average temperature T2. In this embodiment, the threshold Th2 is a predetermined fixed value (for example, 5 ° C.). The threshold value Th2 is also a value for correcting the value of the average temperature T2 that is compared with the predicted temperature T1. In a modified example, the threshold Th2 may be a variable value that varies according to the value of the average temperature T2.

  When the predicted temperature T1 is equal to or higher than the temperature obtained by adding the threshold Th2 to the average temperature T2, the controller 100 determines YES in S26, and proceeds to S28. When YES is determined in S26, the predicted temperature T1 is significantly higher (for example, 5 ° C. or higher) than the average temperature T2. In this case, less hot water supply demand is expected compared to the same time zone of the past 7 days. On the other hand, when the predicted temperature T1 is lower than the temperature obtained by adding the threshold value Th2 to the average temperature T2, the controller 100 determines NO in S26, and proceeds to S30. When NO is determined in S26, it can be rephrased that the difference between the predicted temperature T1 and the average temperature T2 is relatively small. In this case, hot water supply demand equivalent to the same time zone of the past 7 days is expected.

  In S28, the controller 100 specifies the temperature obtained by subtracting the correction value A2 from the primary set temperature Ts1 specified for the specific scheduled use time as the boiling set temperature Ts2 corresponding to the specific scheduled use time, and at the same time. The primary setting amount As1 specified for the scheduled use time is directly specified as the boiling setting amount As2. The correction value A2 is a fixed value (for example, 2 ° C.). In another example, the correction value A2 may be a variation value in which the correction value A2 increases as the difference between the predicted temperature T1 and the average temperature T2 increases. That is, the boiling set temperature Ts2 specified in S28 is the temperature obtained by reducing the primary set temperature Ts1 by the correction value A2. By performing the process of S28, hot water having a boiling set temperature Ts2 (for example, 43 ° C.) lower than the primary set temperature Ts1 (for example, 45 ° C.) by the correction value A2 minutes is stored in the tank 10 at a specific scheduled time. Can be stored by the same boiling setting amount As2 (for example, 30 L) as the primary setting amount As1. When S28 ends, the process proceeds to S32.

  In S30, the controller 100 specifies the primary set temperature Ts1 specified for the specific scheduled use time as the boiling set temperature Ts2 as it is, and the primary set amount As1 specified for the specific scheduled use time is heated as it is. It is specified as the set amount As2. That is, by performing the process of S30, hot water having the same boiling set temperature Ts2 (for example, 45 ° C.) as the primary set temperature Ts1 (for example, 45 ° C.) is primarily set in the tank 10 at a specific scheduled use time. It becomes possible to store the same boiling set amount As2 (for example, 30 L) as the amount As1. When S30 ends, the process proceeds to S32.

  In S32, the controller 100 determines whether or not all scheduled use times estimated in S10 have been specified. If there is an unspecified scheduled use time at this point, the controller 100 determines NO in S32, and returns to S20. In S20 after returning, the controller 100 newly identifies one of the unspecified scheduled use times as the specific scheduled use time, and again performs the processes of S22 to S30 for the specific scheduled use time. Run. In the present embodiment, for example, the controller 100 specifies the scheduled time B1 to start filling the water as the “specified scheduled time of use” in the second S20. On the other hand, if all the scheduled use times have been specified at this point, the controller 100 determines YES in S32, and ends the setting process in FIG.

  When the setting process ends, the controller 100 monitors that the first heat pump operating time (that is, the first heat pump operating time S0 in FIG. 2) has arrived. As described above, in this embodiment, the controller 100 starts the first heat pump operation process of FIG. 4 when the first heat pump operation time S0 arrives.

(First heat pump operation process)
FIG. 4 is a flowchart showing the content of the first heat pump operation process executed by the controller 100. First, in S50, the controller 100 determines whether or not the temperature measured by the thermistor 16 (that is, the water temperature at the position of 30 L from the top of the tank 10) is equal to or higher than the boiling set temperature Ts2. Here, the thermistor 16 is used as a reference because, in the water in the tank 10, the thermistor 16 sets a boiling set amount As2 corresponding to the first hot water supply start scheduled time S1 (the same as the primary set amount As1 in the present embodiment). This is because it is a thermistor that detects the temperature of the water 30 L from the top, which is the amount set as (amount). The boiling set temperature Ts2 serving as a reference for comparison is the boiling set temperature Ts2 for the first scheduled hot water supply start time S1 determined by the setting process of FIG. For example, when the boiling set temperature Ts2 for the first scheduled hot water supply start time S1 is 47 ° C., in S50, the controller 100 determines the temperature measured by the thermistor 16 (that is, the water temperature at a position of 30 L from the top of the tank 10). ) Is equal to or higher than the boiling set temperature Ts2 (47 ° C.). If YES is determined in S50, at least the water temperature at the position of 30 L from the upper portion of the tank 10 is equal to or higher than the boiling set temperature Ts2. As described above, a high temperature water layer is formed on the upper portion of the tank 10, and a low temperature water layer is formed on the lower portion. Therefore, when YES is determined in S50, hot water having the boiling set temperature Ts2 (for example, 47 ° C.) is stored between the position of 30 L of the tank 10 and the upper portion of the tank. If YES is determined in S50, the process proceeds to S54. On the other hand, if NO in S50, the process proceeds to S52.

  In S52, the controller 100 operates the heat pump 50. The controller 100 also rotates the circulation pump 22. That is, the controller 100 starts the boiling operation. As a result, the water existing in the lower portion of the tank 10 is introduced into the tank water circulation path 20, the introduced water is heated by the heat pump 50, and the heated water is returned to the upper portion of the tank 10. As a result, high temperature water is stored in the tank 10. If the heat pump 50 and the circulation pump 22 are already operating at the time of S52, the controller 100 continues to operate the heat pump 50 and the circulation pump 22. When S52 ends, the process returns to S50, and the controller 100 determines whether or not the temperature measured by the thermistor 16 is equal to or higher than the boiling set temperature Ts2. That is, after activating the heat pump 50 in S52, the controller 100 monitors that the temperature measured by the thermistor 16 is equal to or higher than the boiling set temperature Ts2. When the temperature measured by the thermistor 16 is equal to or higher than the boiling set temperature Ts2 (YES in S50), the process proceeds to S54.

  In S54, the controller 100 stops the heat pump 50 and the circulation pump 22. As described above, when YES is determined in S50, hot water having the boiling setting temperature Ts2 (for example, 47 ° C.) is stored between the position of 30 L of the tank 10 and the upper portion of the tank. When S54 ends, the process returns to S50. That is, after stopping the heat pump 50 in S54, the controller 100 monitors that the temperature measured by the thermistor 16 becomes lower than the boiling set temperature Ts2 (that is, NO in S52). When the temperature measured by the thermistor 16 becomes lower than the boiling set temperature Ts2 (NO in S50), the process proceeds to S52 again.

  After starting the first heat pump operation process of FIG. 4, when the first hot water supply operation is performed at a time near the initial hot water supply start scheduled time S1, the hot water in the upper part of the tank 10 supplies hot water through the supply path 40. Supplied to the location. As described above, in the hot water supply system 2 of the present embodiment, at the scheduled initial hot water supply start time S1, it is possible to store hot water in the tank 10 in an amount necessary for hot water supply.

(Second heat pump operation process)
FIG. 5 is a flowchart showing the content of the second heat pump operation process executed by the controller 100. As described above, when the second heat pump operating time B0 arrives, the controller 100 starts the process of FIG. First, in S70, the controller 100 determines whether or not the temperature measured by the thermistor 24 (that is, the water temperature of the water that is derived from the lower portion of the tank 10 and before passing through the heat pump 50) is equal to or higher than the boiling set temperature Ts2. (That is, whether the tank 10 is fully stored) is determined. The boiling set temperature Ts2 is the boiling set temperature Ts2 (for example, 45 ° C.) for the scheduled filling time B1 determined by the setting process of FIG. If YES is determined in S70, the process proceeds to S78. On the other hand, if NO in S70, the process proceeds to S72.

  In S72, the controller 100 operates the heat pump 50. The controller 100 also rotates the circulation pump 22. That is, the controller 100 starts the boiling operation. If the heat pump 50 and the circulation pump 22 are already operating at the time of S72, the controller 100 continuously operates the heat pump 50 and the circulation pump 22. When S72 ends, the process proceeds to S74.

  On the other hand, in S78, the controller 100 stops the heat pump 50 and the circulation pump 22. As described above, when YES is determined in S70, the tank 10 is in the full storage state. Therefore, it is not necessary to operate the heat pump 50 and the circulation pump 22 any more. When S78 ends, the process proceeds to S74. If the heat pump 50 and the circulation pump 22 are already stopped at the time of S78, the controller 100 continuously stops the heat pump 50 and the circulation pump 22.

  In S74, the controller 100 determines whether or not the scheduled time to start filling water B1 has arrived. If YES is determined in S74, the process proceeds to S76 and the filling process (see FIG. 5) is started. On the other hand, if NO in S74, the process returns to S70.

  In this embodiment, when the second heat pump operation process of FIG. 5 is started and the hot water of the boiling set temperature is not sufficiently stored in the tank 10, the heat pump 50 is operated in S72 described above. After that, the scheduled time B1 for starting the filling of water arrives before the tank 10 becomes fully charged (YES in S74).

(Water filling process)
As described above, when the scheduled filling time B1 arrives, the controller 100 starts the filling process in S76. FIG. 6 is a flowchart showing the contents of the filling process. In the present embodiment, an example will be described in which the filling process is automatically started when the scheduled filling time B1 arrives. However, in the modification, when the user performs a predetermined filling start operation. The filling process may be started.

  In S90 of FIG. 6, the controller 100 starts the filling operation. That is, the controller 100 opens the opening / closing valve (so-called hot water filling valve) provided in the hot water supply path to the bathtub to start supplying hot water to the bathtub. Next, in S92, the controller 100 determines whether the heat pump 50 is operating. As described above, when the scheduled filling time B1 arrives and the tank 10 is not in the full storage state, the heat pump 50 continues to operate. In that case, the controller 100 determines YES in S92, and proceeds to S98. On the other hand, if the tank 10 is in the fully-charged state at the time when the scheduled filling time B1 arrives, the heat pump 50 is stopped. In that case, the controller 100 determines NO in S92, and proceeds to S94.

  In S94, the controller 100 monitors whether the temperature measured by the thermistor 16 is lower than the boiling set temperature Ts2. The boiling set temperature Ts2 is the boiling set temperature Ts2 (for example, 45 ° C.) for the scheduled filling time B1 determined by the setting process of FIG. If YES in S94, proceed to S96. In the case of YES in S94, it means that the amount of warm water stored in the tank 10 (that is, the warm water of the boiling set temperature Ts2) has decreased to less than 30 L as a result of the filling operation. In S96, the controller 100 operates the heat pump 50 and rotates the circulation pump 22.

  In subsequent S98, the controller 100 monitors that the temperature measured by the thermistor 12 (that is, the water temperature at a position 6L from the upper portion of the tank 10) is equal to or lower than the hot water supply set temperature. When YES is determined in S98, it means that the amount of hot water (hot water having a temperature higher than the hot water supply set temperature) stored in the tank 10 has decreased to 6 L or less. In the following, this state may be referred to as a "boiled state". In this embodiment, 150 L to 180 L of hot water is required in the filling operation. As described above, in the present embodiment, since the capacity of the tank 10 is 100 L, the hot water exhaustion state (YES in S98) always occurs during the hot water filling operation. When YES is determined in S98 (that is, when the hot water is out), the process proceeds to S100.

  In S100, the controller 100 operates the combustion device 60. In this case as well, the controller 100 continuously operates the heat pump 50 and the circulation pump 22. As a result, the hot water heated by the heat pump 50 and the combustion device 60 is supplied to the bathtub.

  Next, in S102, the controller 100 monitors completion of the filling operation. When the supply of a predetermined amount (for example, 180 L) of hot water to the bath is completed, the controller 100 determines YES in S102, and proceeds to S104.

  In S104, the controller 100 stops the combustion device 60 operated in S100. In this case as well, the controller 100 continuously operates the heat pump 50 and the circulation pump 22 for a predetermined time. When S104 ends, the filling process of FIG. 6 ends. At the same time, the process of FIG. 5 ends. As described above, in the hot water supply system 2 of the present embodiment, at the scheduled start time B1 of filling water, it is possible to store a part of the hot water in the tank 10 in an amount necessary for filling water. That is, during the second predetermined time β, by operating the heat pump 50 only during that time, it becomes possible to store a necessary amount of warm water in the tank 10 at the scheduled time B1 of starting filling water. It's time.

  Further, as described above, the controller 100 operates the heat pump 50 at the second heat pump operation time B0 (S72). Then, at the time when the scheduled filling time B1 arrives, if the tank 10 is not in the full storage state, the heat pump 50 is continuously operated even after the supply of hot water to the bathtub is started (S90 in FIG. 6). (YES in S92 of FIG. 6). In this case, hot water can be supplied to the bath while heating the water with the heat pump 50 and storing it in the tank 10. On the other hand, if the heat pump 50 is stopped at the scheduled start time B1 of filling water (NO in S92 of FIG. 6), it is necessary to operate the heat pump 50 again later, which takes time (S96 of FIG. 6). Further, when the heat pump 50 is continuously operating at the scheduled filling time B1 (YES in S92 of FIG. 6), when the heat pump 50 is stopped at the scheduled filling time B1 (FIG. As compared with NO in S92 of 6, it is possible to suppress frequent stop and re-operation of the heat pump 50. That is, it is possible to reduce the loss due to the stop and re-operation of the heat pump 50 to improve the energy efficiency, and further it is possible to suppress the deterioration of the durability of the heat pump 50.

(Heat pump stop processing)
When the heat pump stop time G0 arrives, the controller 100 starts a heat pump stop process (not shown). That is, the controller 100 stops the heat pump 50 when the heat pump 50 is operating at the heat pump stop time G0. When the heat pump 50 is not operating, the controller 100 keeps the heat pump 50 stopped. When the controller 100 stops the heat pump 50 at the heat pump stop time G0, it does not operate the heat pump 50 until the next day. After that, the final hot water supply operation ends at a time near the scheduled end time G1. Therefore, in the hot water supply system 2 of the present embodiment, it is possible to prevent excess hot water from being stored in the tank 10 at the scheduled end time G1.

  The configuration and operation of the hot water supply system 2 according to this embodiment have been described above. As described above, the hot water supply system 2 of the present embodiment executes the above setting process (FIG. 3) every 24 hours when executing the learning control. As a result, the hot water supply system 2 corresponds to the predicted temperature T1 at the use fixed time and the time for each of the plurality of scheduled use times (that is, the initial hot water supply start scheduled time S1 and the hot water filling start scheduled time B1). The boiling set temperature Ts2 can be set according to the difference from the average temperature T2 (see S22 to S30). Therefore, according to the present embodiment, the hot water supply system 2 can set the boiling set temperature Ts2 that matches the actual hot water supply demand for each of the plurality of scheduled use times. Therefore, the boiling water can be excessively stored in the tank 10, and the frequency with which the combustion device 60 should be operated can be suppressed, so that energy efficiency can be improved.

  As described above, in the present embodiment, the reference temperature (that is, T2-Th1 (S22), T2 + Th2 (S26)) that is compared with the expected temperature T1 is the past seven days at the time corresponding to the specific scheduled use time. Is a temperature specified based on the average temperature T2 of Therefore, according to the present embodiment, the actual temperature value at the time corresponding to the scheduled use time on each day of the past 7 days is reflected in the reference temperature to be compared with the expected temperature T1. Therefore, as compared with the case where the reference temperature to be compared with the predicted temperature T1 is a fixed value, a value that is closer to the actual use environment can be used as the reference for comparison. Therefore, according to the above configuration, the hot water supply system 2 can more appropriately set the boiling set temperature Ts2 that matches the actual hot water supply demand for each of the plurality of scheduled use times, and thus the energy efficiency can be improved. Can be improved. That is, the average temperature T2-threshold value Th1 (S22) and the average temperature T2 + threshold value Th2 in the present embodiment are examples of the "reference temperature".

(Second embodiment)
The hot water supply system 2 of the second embodiment will be described focusing on the points different from the first embodiment. The hot water supply system 2 of the present embodiment also has the same basic configuration as that of the first embodiment, and the content of each process performed when the controller 100 executes the learning control. However, in this embodiment, as shown in FIG. 7, a part of the contents of the setting process is different from that of the first embodiment. Specifically, also in this embodiment, the setting process is a process for determining the boiling setting temperature and the boiling setting amount, but the point that the corrected amount is determined as the boiling setting amount is necessary. Different from the first embodiment. The contents of the setting process executed by the controller 100 in this embodiment will be described below with reference to FIG. 7.

(Setting process)
Also in this embodiment, the controller 100 starts the setting process shown in FIG. 7 when 2:00 arrives. Since each processing of S110 to S120 is the same as S10 to S20 of FIG. 3, detailed description will be omitted.

  In S122, as in S22 of FIG. 3, the controller 100 determines that the predicted temperature T1 at a specific scheduled use time (for example, 6:00, which is the first scheduled hot water supply start time) corresponds to the specific scheduled hot water supply start time ( For example, it is determined whether the temperature is equal to or lower than the temperature obtained by subtracting a predetermined threshold Th1 from the average temperature T2 for the past 7 days at 6:00). When the predicted temperature T1 is equal to or lower than the temperature obtained by subtracting the threshold Th1 from the average temperature T2 (that is, when the predicted temperature T1 is significantly lower than the average temperature T2 (for example, 5 ° C. or higher)), the controller 100 determines YES in S122. And proceeds to S124. In this case, more hot water demand is expected compared to the same time zone in the past 7 days. On the other hand, when the predicted temperature T1 is higher than the temperature obtained by subtracting the threshold Th1 from the average temperature T2, the controller 100 determines NO in S122, and proceeds to S126.

  In S124, the controller 100 specifies the amount obtained by adding the correction value A11 to the primary setting amount As1 specified for the specific scheduled use time as the boiling setting amount As2 corresponding to the specific scheduled use time, and The primary set temperature Ts1 specified for the scheduled use time is directly specified as the boiling set temperature Ts2. Also in this embodiment, the correction value A11 is a fixed value (for example, 5L). In another example, the correction value A11 may be a variation value such that the correction value A11 increases as the difference between the predicted temperature T1 and the average temperature T2 increases. The boiling setting amount As2 specified in S124 is an amount obtained by increasing the primary setting amount As1 by the correction value A11. That is, by performing the process of S124, the hot water having the boiling setting temperature Ts2 that is the same as the primary setting temperature Ts1 is corrected in the tank 10 at a specific scheduled start time of use more than the primary setting amount As1 (for example, 30 L). It becomes possible to store the boiling setting amount As2 (for example, 35 L) which is larger by the value A11. In this embodiment, the upper limit value of the boiling set amount As2 is 100 L, which is the capacity of the tank 10. When S124 ends, the process proceeds to S132.

  On the other hand, in S126, the controller 100 determines whether the predicted temperature T1 is equal to or higher than the temperature obtained by adding the predetermined threshold Th2 to the average temperature T2, as in S26 of FIG. When the predicted temperature T1 is equal to or higher than the temperature obtained by adding the threshold Th2 to the average temperature T2 (that is, when the predicted temperature T1 is significantly higher than the average temperature T2 (for example, 5 ° C. or higher)), the controller 100 determines YES in S126. Then, the process proceeds to S128. In this case, less hot water supply demand is expected compared to the same time zone of the past 7 days. On the other hand, when the predicted temperature T1 is lower than the temperature obtained by adding the threshold Th2 to the average temperature T2 (that is, when the difference between the predicted temperature T1 and the average temperature T2 is relatively small), the controller 100 determines NO in S126. , S130. In this case, hot water supply demand equivalent to the same time zone of the past 7 days is expected.

  In S128, the controller 100 specifies the amount obtained by subtracting the correction value A12 from the primary setting amount As1 specified for the specific scheduled use time as the boiling setting amount As2 corresponding to the specific scheduled use time, and The primary set temperature Ts1 specified for the scheduled use time is directly specified as the boiling set temperature Ts2. The correction value A12 is a fixed value (for example, 5L). In another example, the correction value A12 may be a variation value such that the correction value A12 increases as the difference between the predicted temperature T1 and the average temperature T2 increases. The boiling setting amount As2 specified in S128 is an amount obtained by reducing the primary setting amount As1 by the correction value A12. That is, by performing the process of S128, the hot water having the boiling setting temperature Ts2 that is the same as the primary setting temperature Ts1 is stored in the tank 10 at a specific scheduled use time more than the primary setting amount As1 (for example, 30 L). It becomes possible to store the boiling setting amount As2 (for example, 25 L) which is smaller by A12 minutes. When S128 ends, the process proceeds to S132.

  In S130, the controller 100 specifies the primary set amount As1 specified for the specific scheduled use time as the boiling set amount As2 as it is, and also heats the primary set temperature Ts1 specified for the specific scheduled use time as it is. It is specified as the set temperature Ts2. That is, by performing the process of S130, hot water having the same boiling set temperature Ts2 as the primary set temperature Ts1 is boiled in the tank 10 at the specific scheduled use time as the primary set amount As1 (for example, 30 L). The set amount As2 (for example, 30 L) of hot water can be stored. When S130 ends, the process proceeds to S132.

  In S132, the controller 100 determines whether or not all scheduled use times estimated in S110 have been specified. If there is an unspecified scheduled use time at this point, the controller 100 determines NO in S132, and returns to S120. In S120 after returning, the controller 100 newly identifies one of the unspecified scheduled use times as the specific scheduled use time, and again performs the processes of S122 to S130 for the specific scheduled use time. Run. On the other hand, if all the scheduled use times have been specified at this point, the controller 100 determines YES in S132, and ends the setting process of FIG. 7.

  The setting process of the present embodiment has been described above. In the present embodiment as well, after the setting process is completed, the controller 100 performs the first heat pump operation process (see FIG. 4), the second heat pump operation process (see FIG. 5), and the water filling, as in the first embodiment. The process (see FIG. 6) and the heat pump stop process are executed.

  However, in the present embodiment, in the first heat pump operation process, when the heat pump 50 is operated, the controller 100 sets the hot water having the boiling set temperature Ts2 to the boiling setting determined in the setting process (FIG. 7). The heat pump 50 is operated with the goal of storing the amount As2 in the tank 10.

  Similarly, in the present embodiment, also in the second heat pump operation process, when the heat pump 50 is operated, the controller 100 heats the hot water having the boiling set temperature Ts2 by the boiling process determined in the setting process (FIG. 7). The heat pump 50 is operated for the purpose of storing the set amount As2 in the tank 10.

  The configuration and operation of the hot water supply system 2 according to this embodiment have been described above. As described above, the hot water supply system 2 of the present embodiment executes the above setting process (FIG. 7) every 24 hours when executing the learning control. Thereby, hot water supply system 2 corresponds to each of a plurality of scheduled use times (that is, initial hot water supply start scheduled time S1 and hot water filling start scheduled time B1), and predicted temperature T1 at the scheduled use time and the time. The boiling setting amount As2 can be set according to the difference from the average temperature T2 (see S122 to S130). Therefore, according to the present embodiment, the hot water supply system 2 can set the boiling set amount As2 that matches the actual hot water supply demand for each of the plurality of scheduled use times.

  Although the embodiments have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

(Modification 1) In each of the above-described embodiments, a reference temperature (that is, T2-Th1 (S22 of FIG. 3, S122 of FIG. 7)), T2 + Th2 (S26 of FIG. 3, FIG. 7) to be compared with the expected temperature T1. S126)) is the temperature specified based on the average temperature T2 of the past 7 days at the time corresponding to the specified scheduled use time. Not limited to this, the reference temperature to be compared with the predicted temperature T1 may be a predetermined fixed value. Further, it may be a value determined for each range of the predicted temperature T1. Further, the temperature may be specified based on the maximum temperature or the minimum temperature for the past seven days at the time corresponding to the specific scheduled use time. These cases are also examples of the “reference temperature”.

(Modification 2) In the first embodiment, the controller 100 performs the setting process (FIG. 3) to correspond to the expected temperature T1 at the scheduled use time and the time for each of the scheduled use times. The primary set temperature Ts1 is corrected and the boiling set temperature Ts2 is set according to the difference from the average temperature T2 that is set (the primary set amount As1 is directly set to the boiling set amount As2). In the second embodiment, the controller 100 sets the primary set amount As1 for each of the plurality of scheduled use times according to the difference between the predicted temperature T1 at the scheduled use time and the average temperature T2 corresponding to that time. After correction, the boiling setting amount As2 is set (the primary setting temperature Ts1 is directly set to the boiling setting temperature Ts2). However, the present invention is not limited to this, and the controller 100 performs a setting process, and, for each of a plurality of scheduled use times, according to the difference between the predicted temperature T1 at the scheduled use time and the average temperature T2 corresponding to that time, Both the primary set temperature Ts1 and the primary set amount As1 may be corrected to set both the boiling set temperature Ts2 and the boiling set amount As2. Generally speaking, when performing learning control, the controller generates boiling points for each of a plurality of scheduled use times according to the difference between the predicted temperature indicated by the predicted temperature information at the scheduled use time and the reference temperature. The value of at least one of the set-up temperature and the set-up boiling amount may be corrected.

(Modification 3) In each of the above embodiments, the controller 100 obtains the predicted temperature information and the actual temperature information from an external server (not shown) via the network 4 (see S18 in FIG. 3 and S118 in FIG. 7). The present invention is not limited to this, and the controller 100 may acquire the predicted temperature information and the actual temperature information by another method (that is, not via the network 4) such as input by a user or reception of a data broadcast. .

(Modification 4) In another modification, the controller 100 may acquire the actual temperature information by storing the outside air temperature measured by the outside air temperature sensor 52 for seven days.

  The technical elements described in the present specification or the drawings exert technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technique illustrated in the present specification or the drawings can simultaneously achieve a plurality of objects, and achieving the one object among them has technical utility.

2: Hot water supply system 4: Network 10: Tanks 12, 14, 16, 17, 18: Thermistor 20: Tank water circulation path 22: Circulation pump 24: Thermistor 30: Tap water introduction path 30a: First introduction path 30b: Second introduction Line 31: Tap water supply source 32: Thermistor 40: Supply line 42: Mixing valve 44: Thermistor 50: Heat pump 52: Outside temperature sensor 60: Combustion device 100: Controller

Claims (2)

A heat pump that absorbs heat from the natural environment,
A tank for storing water heated by the heat pump,
A supply path for supplying water in the tank to a hot water supply point,
A combustion device that heats water by burning gas,
Equipped with a controller,
The controller is
Each time when hot water supply is started on each day within a predetermined period in the past, and an operation history indicating the amount of hot water supply at each hot water supply timing are stored,
Based on the driving history, estimate a plurality of scheduled use time on the day,
For each of the plurality of scheduled use times, the heat pump is operated at a heat pump operating time that is a predetermined time before the scheduled use time, and hot water having a boiling set temperature is set to the tank by a boiling set amount. It is possible to execute learning control to store,
When the controller executes the learning control,
For each of the plurality of scheduled use times, obtain expected temperature information indicating the expected temperature at the scheduled use time,
For each of the plurality of scheduled use times, at least one of the boiling set temperature and the boiling set amount according to the difference between the predicted temperature and the reference temperature indicated by the predicted temperature information at the scheduled use time. Correct one value,
Hot water supply system.   The hot water supply system according to claim 1, wherein the reference temperature is a temperature specified based on an air temperature at a time corresponding to the scheduled use time on each day in the past predetermined period.

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