JP2019060516A - Hot water system - Google Patents

Abstract

To provide a technology capable of improving energy efficiency in a hot water filling operation without damaging convenience of a user, in a hot water system including a heat pump.SOLUTION: A hot water system includes a tank, a heat pump, circulation means for circulating water between the tank and the heat pump, a combustion device, a hot water filling instruction device for instructing the start of hot water filling in a bathtub; a bathing detection device for detecting bathing; and a controller. The hot water system can execute a hot water filling operation in which water in the tank is supplied to the bathtub while heating the water in the tank by the heat pump. The controller is constituted so as to estimate bathing start time of that day based on the bathing start time of each day during a first predetermined period in the past. The controller sets a flow rate of water supplied to the bathtub in the hot water filling operation of that day based on the start time of the hot water filling operation of that day and the estimated bathing start time of that day.SELECTED DRAWING: Figure 5

Description

  The technology disclosed herein relates to a hot water supply system.

  In Patent Document 1, a tank for storing water, a heat pump for absorbing heat from the natural environment to heat the water, a circulating means for circulating the water between the tank and the heat pump, and a combustion apparatus for heating the water by combustion of the fuel gas Also, a hot water system is disclosed that includes a hot water indication device that instructs the start of hot water to the bathtub and a controller. In this hot water supply system, it is possible to execute a hot water heating operation in which the water in the tank is supplied to the bathtub while heating the water in the tank by a heat pump.

JP, 2013-224762, A

  In the hot water supply system as described above, if the flow rate of water supplied to the bath in the hot water pouring operation is increased in order to complete the hot water pouring operation promptly, the increase in high temperature water in the tank due to heating by the heat pump. Therefore, the decrease in high temperature water in the tank due to the hot water to the bath will be greater, and the high temperature water in the tank will gradually decrease. When the high temperature water in the tank is used up, the water heating by the combustion device is necessary in the subsequent hot water pouring operation. It is preferable that heating of the water by the combustion device is not performed as much as possible in the hot water operation since heating of the water by the combustion device is lower in energy efficiency than heating of water by the heat pump.

  However, if the flow rate of water supplied to the bath is reduced so that heating of the water by the combustion device is not performed in the hot water operation, although the reduction of high temperature water in the tank is suppressed, the completion of the hot water operation is completed. It will take a long time to complete. If it takes a long time to complete the hot water operation, when the user wants to take a bath, the hot water to the bathtub may not be completed, and the convenience of the user may be lost.

  The present specification provides a technique for solving the above-mentioned problems. In the present specification, in a hot water supply system including a heat pump, a technology is provided that can improve the energy efficiency in hot water heating operation without impairing the convenience of the user.

  The hot water supply system disclosed herein comprises a tank for storing water, a heat pump for absorbing heat from the natural environment to heat the water, a circulation means for circulating the water between the tank and the heat pump, and the combustion of fuel gas. A heating device, a hot water indication device for instructing the start of hot water to the bathtub, a bathing detection device for detecting bathing, and a controller are provided. The hot water supply system can perform a hot water heating operation that supplies the water of the tank to the bath while heating the water of the tank with a heat pump. The controller is configured to estimate the bathing start time of the day based on the bathing start time of each day in the past first predetermined period. The controller is configured to set the flow rate of water to be supplied to the bathtub in the hot water operation on the current day based on the start time of the hot water operation on the current day and the bathing start time on the current day estimated.

  According to the above configuration, the flow rate of the water supplied to the bathtub in the hot water pouring operation is reduced if there is sufficient time between the start of hot water pouring to the bathtub and the start of bathing. Thus, the reduction of high temperature water in the tank can be suppressed. By this, the hot water pouring operation is completed by the bathing start time, and the heating of the water by the combustion device can be suppressed and the energy efficiency in the hot water pouring operation can be improved while securing the convenience of the user.

  In the above-described hot water supply system, the controller is based on the bathing start time of each day in the past first predetermined period and the bathing start time of each day in the second predetermined period different in length from the past first predetermined period. , And may be configured to estimate the bathing start time of the day.

  According to the above configuration, it is possible to estimate the bathing start time on the day taking into consideration both the past performance in a relatively long period and the past performance in a relatively short period with respect to the bathing start time. . The bathing start time of the day can be estimated more appropriately.

  In the above-described hot water supply system, the controller may be configured to estimate the bathing start time of the current day based on the bathing start time of each day having the same day as the current day in the past first predetermined period.

  Usually, even though the lifestyle of the user may differ depending on the day of the week, the lifestyle is often the same for the same day of the week. According to the hot water supply system described above, since the bathing start time of the day is estimated based on the past results on the same day as the day, the bathing start time of the day can be estimated more appropriately.

  Another hot water supply system disclosed herein comprises a tank for storing water, a heat pump for absorbing heat from the natural environment to heat the water, a circulation means for circulating water between the tank and the heat pump, and combustion of a fuel gas. The apparatus includes a combustion device for heating water, a hot water indication device for instructing the start of hot water to the bathtub, a bathing detection device for detecting bathing, and a controller. The hot water supply system can perform a hot water heating operation that supplies the water of the tank to the bath while heating the water of the tank with a heat pump. The controller estimates the time difference from the start time of the water heating operation on the day to the bathing start time based on the time difference from the start time of the water heating operation on each day to the bathing start time in the past first predetermined period It is configured. The controller is configured to set the flow rate of water to be supplied to the bathtub in the hot water operation on the current day based on the time difference from the start time of the hot water operation on the current day to the bathing start time.

  According to the above configuration, the flow rate of the water supplied to the bathtub in the hot water pouring operation is reduced if there is sufficient time between the start of hot water pouring to the bathtub and the start of bathing. Thus, the reduction of high temperature water in the tank can be suppressed. By this, the hot water pouring operation is completed by the bathing start time, and the heating of the water by the combustion device can be suppressed and the energy efficiency in the hot water pouring operation can be improved while securing the convenience of the user.

  In the above-described hot water supply system, the controller determines a second predetermined period in which the time difference from the start time of hot water pouring operation on each day in the past first predetermined period to the bathing start time differs from the first predetermined period in the past. The time difference from the start time of the hot water driving on that day to the bathing start time may be estimated based on the time difference from the start time of the hot water driving on each day to the bathing start time.

  According to the above configuration, regarding the time difference from the start time of the hot water pouring operation to the bathing start time, taking into consideration both the past performance in a relatively long period and the past performance in a relatively short period, It is possible to estimate the time difference from the start time of the hot water beam driving to the bathing start time. The time difference from the start time of the water heating operation of the day to the bathing start time can be estimated more appropriately.

  In the above-described hot water supply system, the controller starts the hot water operation on the current day based on the time difference from the start time of the hot water operation on each day when the day is the same as the day in the first predetermined period in the past to the bathing start time. The time difference from the time to the bathing start time may be estimated.

  Usually, even though the lifestyle of the user may differ depending on the day of the week, the lifestyle is often the same for the same day of the week. According to the hot water supply system described above, since the time difference from the start time of the hot water operation on the day to the bathing start time is estimated based on the past results on the same day as the day, bathing from the start time of the hot water operation on the day The time difference to the start time can be estimated more appropriately.

  In the above-described hot water supply system, the controller is configured to change the flow rate of water supplied to the bathtub in the hot water pouring operation on the day to the maximum flow amount when bathing is detected before the hot water pouring operation on the day is completed. It may be

  According to the above configuration, when the user starts bathing earlier than estimated, the hot water pouring operation can be completed promptly by setting the flow rate of water supplied to the bathtub in the hot water pouring operation to the maximum flow rate. . User convenience can be ensured.

The figure which shows typically the structure of the hot-water supply systems 2 and 202 of Example 1, 2. FIG. The figure which shows typically the time slot | zone where hot water supply is performed in a general household. The flowchart which shows the 1st heat pump operation | movement process which the controller 100 of Example 1, 2 performs. The flowchart which shows the 2nd heat pump operation | movement process which the controller 100 of Example 1, 2 performs. 6 is a flowchart showing a hot water heating process performed by the controller 100 according to the first embodiment. 7 is a flowchart showing a hot water heating process performed by the controller 100 according to the second embodiment.

Example 1
As shown in FIG. 1, the hot water supply system 2 according to the present embodiment includes a tank 10, a tank water circulation passage 20, a tap water introduction passage 30, a supply passage 40, a heat pump 50, a combustion device 60, and a controller 100. , A remote control 110, and a portable terminal device 120.

  The heat pump 50 is a heat source which heats the water in the tank water circulation passage 20 by absorbing heat from the outside air which is a natural environment. The heat pump 50 is not shown, but a refrigerant circulation path for circulating a refrigerant (for example, C410 alternative), an evaporator for exchanging heat between the outside air and the refrigerant, and a compression for compressing the refrigerant to a high temperature and high pressure A condenser for performing heat exchange between the water in the tank water circulation passage 20 and the high temperature / high pressure refrigerant, and an expansion valve for decompressing the refrigerant after the heat There is. In addition, the heat pump 50 is provided with an outside air temperature sensor 52 that measures the outside air temperature.

  The tank 10 stores the hot water heated by the heat pump 50. The tank 10 is of a closed type and is covered on the outside by a heat insulating material. Water is stored in the tank 10 to full water. In the present embodiment, the capacity of the tank 10 is 100L. In the tank 10, thermistors 12, 14, 16, 17, 18 are attached 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, the thermistors 12, 14, 16, 17, 18 respectively measure the temperature of water at positions 6L, 12L, 30L, 50L, 70L from the top of the tank 10.

  The tank water circulation passage 20 has an upstream end connected to the lower portion of the tank 10 and a downstream end connected to the upper portion of the tank 10. A circulation pump 22 is interposed in the tank water circulation passage 20. The circulation pump 22 pumps the water in the tank water circulation passage 20 from the upstream side to the downstream side. In addition, the tank water circulation passage 20 passes through a heat exchanger (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 heat exchanger 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 passage 20 is a water passage for storing heat in the tank 10. Further, on the upstream side of the heat pump 50 of the tank water circulation passage 20, a thermistor 24 is interposed. The thermistor 24 is derived 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 at a position closer to the heat pump 50 than the circulation pump 22 or may be provided in the tank water circulation passage 20 at a position near the tank 10 than the circulation pump 22 .

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

  The supply path 40 is connected to the upper end of the tank 10 at its upstream end. A combustion device 60 is interposed in the supply passage 40 on the downstream side of the connection 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 hot water. The combustion device 60 heats the water by the combustion of the fuel gas. The combustion device 60 heats the water in the supply passage 40 so that the temperature of the hot 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 point (for example, a kitchen run, a shower 54 of the bathroom 48, a run 56, etc.). Further, at the downstream end of the supply path 40, a hot water valve 46 for hot watering the bathtub 58 of the bathroom 48 is provided. The hot water filling valve 46 can adjust the flow rate of the hot water supplied to the bathtub 58 by adjusting the opening degree. In the bathroom 48, a human sensor 62 for detecting the presence or absence of a bather is provided.

  The controller 100 is electrically connected to each component and controls the operation of each component. A remote controller 110 is connected to the controller 100. The remote control 110 can display various information related to the hot water supply system 2. Also, the remote control 110 can accept various operation inputs related to the hot water supply system 2. The user of the hot water supply system 2 sets the hot water supply set temperature which is the temperature of the water supplied to the shower 54 and the caran 56 through the remote control 110, the bath set temperature which is the temperature of the water supplied to the bathtub 58, etc. be able to. Further, the user of the hot water supply system 2 can instruct the start of the hot water to the bathtub 58 through the remote control 110. The remote control 110 can communicate with a router (not shown) via wireless communication, and can connect to the Internet via the router.

  The mobile terminal device 120 is a mobile terminal device such as a mobile phone or a smartphone, which is used by the user of the hot water supply system 2 on a daily basis. The portable terminal device 120 can communicate with the remote control 110 via the Internet. In the mobile terminal device 120, an application for remotely managing the hot water supply system 2 is installed. The portable terminal device 120 can display various information related to the hot water supply system 2. In addition, the portable terminal device 120 can receive various operation inputs related to the hot water supply system 2. The user of the hot water supply system 2 sets the hot water supply set temperature which is the temperature of the water supplied to the shower 54 and the caran 56 etc., the bath set temperature which is the temperature of the water supplied to the bathtub 58 etc. Can be Further, the user of the hot water supply system 2 can instruct the start of hot water to the bathtub 58 through the portable terminal device 120.

  Next, the operation of the hot water supply system 2 of the present embodiment will be described. The hot water supply system 2 can perform a boiling operation, a hot water supply operation, and a hot water heating operation. In the present specification, both the hot water supply operation and the hot water heating operation of the hot water supply system 2 are referred to as hot water supply by the hot water supply system 2. Each operation will be described below.

(Boiling operation)
The boiling operation is an operation of heating the water in the tank 10 by the heat pump 50. When execution of the boiling operation is instructed by the controller 100, the heat pump 50 operates and the circulation pump 22 operates. When the circulation pump 22 operates, the water in the tank 10 circulates in the tank water circulation passage 20. That is, when the water present in the lower part of the tank 10 is introduced into the tank water circulation passage 20 and the introduced water passes through the heat exchanger in the heat pump 50, the water heated and heated by the heat of the refrigerant is It is returned to the top of the tank 10. As a result, high temperature water is stored in the tank 10. Inside the tank 10, a temperature stratification is formed in which a layer of high temperature water is laminated on a layer of low temperature water.

(Hot water supply operation)
The hot water supply operation is an operation for supplying the water in the tank 10 to the hot water supply location. The hot water supply operation can also be performed during the above-described boiling operation. When the hot water supply tap is opened at the hot water supply location, tap water flows into the lower part of the tank 10 from the tap water introduction passage 30 (first introduction passage 30 a) by the water pressure from the tap water supply source 31. At the same time, the hot water in the upper part of the tank 10 is supplied to the hot water supply location through the supply passage 40.

  When the temperature of the water supplied from the tank 10 to the supply passage 40 (i.e., the measured temperature of the thermistor 12) is higher than the hot water supply set temperature, the controller 100 opens the mixing valve 42 and supplies it from the second introduction passage 30b. Introduce tap water to the road 40. Therefore, the water supplied from the tank 10 and the tap water supplied from the second introduction passage 30 b are mixed in the supply passage 40. The controller 100 adjusts the degree of opening 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. Accordingly, 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 such that the temperature of the water supplied to the hot water supply point matches the hot water supply temperature setting.

(Hot water operation)
In the hot water operation, the water in the tank 10 is supplied to the bathtub 58. When the remote controller 110 or the portable terminal device 120 instructs to start the hot water, the controller 100 opens the hot water valve 46. Thus, the water temperature-controlled to the bath setting temperature is supplied to the bath 58 in the same manner as the hot water supply operation. In addition, as described later, the controller 100 also executes the above-described boiling operation when executing the hot water pouring operation.

(Learning control)
FIG. 2 is a view schematically showing a time zone in which hot water supply is performed during a certain day. In the present embodiment, 24 hours starting at 2:00 is used as a unit time for specifying one day.

  Generally, for example, hot water supply is performed first at 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 breakfast preparation and washing. In the first hot water supply, approximately 5 L to 20 L of hot water is supplied. Thereafter, for example, a second hot water supply is performed at 11:00 to 12:00 (11:00 in the example of FIG. 2). The second hot water supply is, for example, a hot water supply for preparation of lunch. Even in the second hot water supply, about 5 L to 20 L of hot water is supplied. After that, for example, a third hot water supply is performed at 20:00 (20:00 in the example of FIG. 2). The third hot water supply is hot water driving to the bathtub 58. In the hot water operation, hot water of about 150 liters to 180 liters is supplied. Thereafter, for example, the final hot water supply is performed from 23:00 to 0:00 (approximately 23:00 in the example of FIG. 2). The last hot water supply is, for example, hot water supply for brushing teeth and the like. In the last hot water supply, approximately 5 liters to 10 liters of hot water is supplied. The last hot water supply ends at around 0:00.

  In the present embodiment, the controller 100 stores, as the hot water supply record, the hot water supply usage amount indicating the time when the hot water supply was started, the time when the hot water supply ended, and the amount of hot water used for the hot water supply every time the hot water supply is performed. Do. In addition, every time the hot water pouring to the bathtub 58 is started, the controller 100 instructs the start of the hot water pouring (the remote control 110 instructs the start of the hot water pouring, or the portable terminal device 120 The start of the water bath was instructed and the time when the water bath was started is stored as the water bath result. Furthermore, every time the controller 100 detects a bather in the bathroom 48 by the human sensor 62, the time when bathing is started (the time when the bather is not detected and the state where the bather is detected is switched to) And the time when the bathing ended (the time when the state of detecting the bather was switched to the state of not detecting the bather) are stored as the bathing record. And the controller 100 memorize | stores the hot-water supply results for 1 day, the hot-water beam results, and the bathing results as a driving history for 1 day. In the present embodiment, the controller 100 stores the operation history of each day in the past predetermined period (for example, 12 weeks).

  Subsequently, a process performed by the controller 100 every 24 hours (every time the time is 2:00) will be described. The controller 100 newly stores the driving history of the previous day every 24 hours.

  Next, the controller 100 specifies the earliest time among the times when the first hot water supply was started (hot water supply start time) in the past seven days from the operation history for the past seven days. Hereinafter, this time is referred to as "hot water supply start time S1". For example, the controller 100 specifies 6:00 as the hot water supply start time S1 (see FIG. 2).

  Furthermore, the controller 100 specifies, from the operation history for the past seven days, the largest amount of hot water usage among the amounts of hot water usage from the hot water supply start time to the hot water start before the last seven days. Below, this hot-water supply usage amount is called "1st hot-water supply amount Q1." For example, the controller 100 specifies 30L as the first hot-water supply amount Q1.

  Further, the controller 100 specifies the earliest time of the times (hot water start time) at which the hot water has been started in the past seven days from the operation history for the past seven days. Hereinafter, this time is referred to as "hot-spring start time B1". For example, the controller 100 specifies 20:00 as hot water start time B1 (see FIG. 2).

  Moreover, the controller 100 specifies the earliest time among the times (the bathing start time) at which bathing was first started in the past seven days from the driving history for the past seven days. Below, this time is called "bathing start time T1." For example, the controller 100 specifies 21:00 as the bathing start time T1 (see FIG. 2).

  Furthermore, the controller 100 specifies, from the operation history for the past seven days, the latest time among the times when the last hot water supply ended (hot water supply end time) in the past seven days. Hereinafter, this time is referred to as “hot water supply end time G1”. For example, the controller 100 specifies 0:00 as the hot water supply end time G1 (see FIG. 2).

  Furthermore, the controller 100 specifies the first predetermined time α based on the temperature TW (that is, the temperature of the tap water) measured by the thermistor 32 and the first amount of hot water supply Q1. Further, the controller 100 specifies the second predetermined time β and the third predetermined time γ based on the temperature TW (that is, the temperature of the tap water) measured by the thermistor 32.

  As shown in FIG. 2, when the temperature TW is 21 ° C. or higher, the controller 100 specifies “20 minutes” as the first predetermined time α. When the temperature TW is 13 ° C. or more and less than 21 ° C., the controller 100 specifies “30 minutes” as the first predetermined time α. If the temperature TW is less than 13 ° C., the controller 100 specifies “45 minutes” as the first predetermined time α. The controller 100 specifies a short time as the first predetermined time α as the temperature TW is higher.

  Further, as shown in FIG. 2, when the first hot-water supply amount Q1 is less than 12 L, the controller 100 specifies “5 minutes” as the addition time of the first predetermined time α. When the first hot-water supply amount Q1 is 12 L or more and less than 30 L, the controller 100 specifies “10 minutes” as the addition time of the first predetermined time α. When the first hot water supply amount Q1 is 30 L or more, the controller 100 specifies “15 minutes” as an addition time of the first predetermined time α. The controller 100 specifies a short time as the addition time of the first predetermined time α as the first hot water supply amount Q1 is smaller.

  Similarly, as shown in FIG. 2, when the temperature TW is 21 ° C. or higher, the controller 100 specifies “40 minutes” as the second predetermined time β. When the temperature TW is 13 ° C. or more and less than 21 ° C., the controller 100 specifies “50 minutes” as the second predetermined time β. When the temperature TW is less than 13 ° C., the controller 100 specifies “60 minutes” as the second predetermined time β. The controller 100 specifies a short time as the second predetermined time β as the temperature TW is higher.

  Furthermore, similarly, as shown in FIG. 2, when the temperature TW is 21 ° C. or higher, the controller 100 specifies “80 minutes” as the third predetermined time γ. When the temperature TW is 13 ° C. or more and less than 21 ° C., the controller 100 specifies “50 minutes” as the third predetermined time γ. If the temperature TW is less than 13 ° C., the controller 100 specifies “40 minutes” as the third predetermined time γ. The controller 100 specifies a longer time as the third predetermined time γ as the temperature TW is higher.

  Next, the controller 100 specifies a first heat pump operation time S0 that is a time before the specified first predetermined time α from the hot water supply start time S1. In the present embodiment, when the first heat pump operation time S0 comes, the controller 100 starts a first heat pump operation process (see FIG. 3) described later.

  Further, the controller 100 specifies a second heat pump operation time B0 which is a time that is earlier than the specified second predetermined time β from the hot water start time B1. In the present embodiment, when the second heat pump operation time B0 comes, the controller 100 starts a second heat pump operation process (see FIG. 4) described later.

  Furthermore, the controller 100 specifies the heat pump stop time G0 that is the time before the specified third predetermined time γ from the hot water supply end time G1. In the present embodiment, when the heat pump stop time G0 comes, the controller 100 starts a heat pump stop process described later.

(First heat pump operation process)
FIG. 3 is a flowchart showing the contents of the first heat pump operation process executed by the controller 100. As described above, when the first heat pump operation time S0 comes, the controller 100 starts the process of FIG.

  First, in S10, the controller 100 selects the thermistor corresponding to the first hot water supply amount Q1 among the thermistors 12, 14, 16, 17, 18 attached to the tank 10. In the present embodiment, since the first hot-water supply amount Q1 is 30L, the controller 100 selects the thermistor 16 corresponding to 30L.

  At S12, the controller 100 determines whether the temperature measured by the thermistor 16 selected at S10 (that is, the water temperature 30 L from the top of the tank 10) is higher than a predetermined threshold value TA.

  In the present embodiment, the predetermined threshold value TA is "boiling set temperature-10 ° C". The boiling set temperature is, for example, 47 ° C. Therefore, the predetermined threshold value TA is, for example, 37.degree. If it is determined YES in S12, the water temperature at the position of 30 L from the top of the tank 10 is at least higher than the threshold value TA (eg, 37 ° C.). As described above, inside the tank 10, a temperature stratification is formed in which a layer of high temperature water is laminated on a layer of low temperature water. Therefore, when it is judged YES in S12, high temperature water close to the boiling set temperature (for example, 47 ° C.) is stored between the position of 30 L of the tank 10 and the upper portion of the tank. That is, when it is judged YES in S12, hot water of an amount (about 5 L to 20 L) necessary for the first hot water supply scheduled to be performed near the hot water supply start time S1 is stored in the tank 10. It means that. When it is judged as YES by S12, it progresses to S18. On the other hand, when it is judged as NO by S12, it progresses to S14.

  At S14, the controller 100 determines whether the heat pump 50 is operating. When the heat pump 50 is operating, the controller 100 determines YES in S14, and returns to S12. In this case, the controller 100 continues the boiling operation of heating the water in the tank 10 by the heat pump 50. On the other hand, when the heat pump 50 is not operating, the controller 100 determines NO in S14, and proceeds to S16.

  At S16, 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. Thereby, the water present in the lower part of the tank 10 is introduced into the tank water circulation passage 20, the introduced water is heated by the heat pump 50, and the heated water is returned to the upper part of the tank 10. As a result, high temperature water is stored in the tank 10. After activating the heat pump 50 in S16, the process returns to S12, and the controller 100 determines that the temperature measured by the thermistor 16 becomes higher than a predetermined threshold value TA (that is, the water of the first hot water supply amount Q1 is predetermined in the tank 10). Monitoring that the water temperature is higher than the threshold value TA). If the temperature measured by the thermistor 16 becomes higher than the predetermined threshold value TA (YES in S12), the process proceeds to S18.

  In S18, the controller 100 stops the heat pump 50 and the circulation pump 22. As described above, when it is determined YES in S12, warm water of an amount (the first hot-water supply amount Q1 (30 L)) necessary for the first hot-water supply is already stored in the tank 10.

  When the first hot water supply operation is performed at a time near the hot water supply start time S1 after the first heat pump operation processing of FIG. 3 is started, the hot water in the upper part of the tank 10 is supplied to the hot water supply location via the supply passage 40 Supplied. As described above, in the hot water supply system 2 of the present embodiment, it is possible to store the amount of hot water necessary for hot water supply in the tank 10 at the hot water supply start time S1. That is, by operating the heat pump 50 only for the first predetermined time α, it is possible to store an amount of hot water necessary for hot water supply in the tank 10 at the hot water supply start time S1. It's time.

(Second heat pump operation process)
FIG. 4 is a flowchart showing the contents of the second heat pump operation process executed by the controller 100. As described above, when the second heat pump activation time B0 comes, the controller 100 starts the process of FIG. 4.

  First, in S30, the controller 100 determines whether the temperature measured by the thermistor 24 (ie, the temperature of water derived from the lower part of the tank 10 and before passing through the heat pump 50) is higher than a predetermined threshold TB (ie, It is judged whether or not the tank 10 is full. When it is judged as YES by S30, it progresses to S38. On the other hand, when it is judged as NO by S30, it progresses to S32.

  In S32, 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. When the heat pump 50 and the circulation pump 22 are already operating at the time of S32, the controller 100 operates the heat pump 50 and the circulation pump 22 continuously. When S32 ends, the process proceeds to S34.

  On the other hand, in S38, the heat pump 50 and the circulation pump 22 are stopped. As described above, when it is determined YES in S30, 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 S38 ends, the process proceeds to S34.

  In S34, the controller 100 determines whether a hot water pouring start instruction has been issued from the remote control 110 or the portable terminal device 120. When it is judged as YES by S34, it progresses to S36 and starts a hot water pouring process (refer FIG. 5). On the other hand, if NO in S34, the process returns to S30.

  In the present embodiment, when the controller 100 operates the heat pump 50 at the second heat pump activation time B0 (S32), the temperature measured by the thermistor 24 becomes lower than the predetermined threshold value TB at the hot water start time B1. , A second predetermined time β is specified. However, the time when the user actually instructs the start of the water bath may be earlier or later than the water bath start time B1. In addition, the amount of hot water in the tank 10 at the second heat pump activation time B0 may be larger or smaller than expected. For this reason, after activating the heat pump 50 in the above-described S32, the user may be instructed by the user to start the hot-water pouring before the tank 10 becomes full-stocked, or the tank 10 becomes fully-stocked After stopping the heat pump 50 in S38 described above, the user may issue an instruction to start the water bath.

(Hot water treatment)
As described above, when the user instructs to start the hot water beam, the controller 100 starts the hot water heating process in S36. FIG. 5 is a flowchart showing the contents of the hot water heating process.

  In S50 of FIG. 5, the controller 100 acquires the current time, that is, the time when the start of the water bath is instructed.

  In S52, the controller 100 supplies the hot water to the bathtub 58 in the hot water pouring operation from the current time acquired in S50 and the bathing start time T1 estimated from the past operation results (hereinafter also referred to as the hot water pouring flow) Identify). Specifically, the controller 100 calculates the time ΔT1 from the current time to the bathing start time T1 and supplies the amount L (for example, 150 L) of hot water to be supplied to the bathtub 58 in the hot water pouring operation for the time ΔT1. The hot water flow rate is specified by calculating the flow rate of

  At S54, the controller 100 starts the hot water operation. That is, the controller 100 opens the hot water valve 46 of the bathtub 58 and starts the supply of hot water to the bathtub 58. At this time, the controller 100 adjusts the opening degree of the hot water valve 46 so that the flow rate of the hot water supplied to the bathtub 58 becomes the hot water flow rate specified in S52.

  At S56, the controller 100 determines whether the heat pump 50 is operating. When the heat pump 50 is operating, the controller 100 determines YES in S56, and proceeds to S62. On the other hand, when the heat pump 50 is stopped, the controller 100 determines NO in S56, and proceeds to S58.

  At S58, the controller 100 monitors that the temperature measured by the thermistor 18 becomes less than or equal to a predetermined threshold value TA. In S58, instead of monitoring the temperature measured by the thermistor 18, it may be monitored that the temperature measured by the thermistor 24 becomes equal to or less than a predetermined threshold value TA. If YES in S58, the process proceeds to S60. In S60, the controller 100 operates the heat pump 50 and rotates the circulation pump 22.

  At S62, the controller 100 controls activation and deactivation of the combustion device 60. For example, the controller 100 operates the combustion device 60 when the temperature measured by the thermistor 12 (i.e., the water temperature 6 L from the top of the tank 10) falls below the bath setting temperature. In this case, the hot water heated by the heat pump 50 and the combustion device 60 is supplied to the bath 58. Further, the controller 100 stops the combustion device 60 when the temperature measured by the thermistor 14 (that is, the water temperature at a position 12 L from the top of the tank 10) exceeds the bath set temperature. In this case, the hot water heated by the heat pump 50 is supplied to the bath 58.

  In S64, the controller 100 determines whether the human sensor 62 has detected a bather. In the case of YES in S64, since the bather enters the bathroom 48 before the hot water filling to the bathtub 58 is completed, the hot water filling to the bathtub 58 needs to be completed promptly. Therefore, in the case of YES in S64, the process proceeds to S66, and the hot water flow rate is changed to the maximum flow rate. If NO in S64, S66 is skipped.

  At S68, the controller 100 monitors the completion of the water heating operation. When the amount L (for example, 150 L) of water to be supplied to the bathtub 58 in the hot water heating operation has been supplied to the bathtub 58, the controller 100 determines YES in S68 and proceeds to S70. If NO in S68, the process returns to S56.

  At S70, the controller 100 stands by until the temperature measured by the thermistor 24 becomes higher than a predetermined threshold TB (ie, until the tank 10 is fully stored). When it is judged as YES by S70, heat pump 50 is stopped by S72. When S72 ends, the hot-water heating process of FIG. 5 ends. At the same time, the process of FIG.

  As described above, in the hot water system 2 of the present embodiment, at the hot water start time B1, it is possible to store a part of the hot water of the amount necessary for the hot water filling in the tank 10. That is, by operating the heat pump 50 only for the second predetermined time β, it is possible to store the necessary amount of hot water in the tank 10 at the hot water start time B1. It is.

(Heat pump stop processing)
When the heat pump stop time G0 comes, 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 time of the heat pump stop time G0. When the heat pump 50 is not operating, the controller 100 stops the heat pump 50 as it is. When the heat pump 50 is stopped at the heat pump stop time G0, the controller 100 does not operate the heat pump 50 until the next day. Thereafter, at the time near the hot water supply end time G1, the last hot water supply operation ends. Therefore, in the hot water supply system 2 of the present embodiment, it is possible to prevent excessive hot water from being stored in the tank 10 at the hot water supply completion time G1. That is, by not operating the heat pump 50 during the third predetermined time γ, it is possible to prevent excessive hot water from being stored in the tank 10 at the time of the hot water supply completion time G1. It's time.

  In the above, from the operation history for the past seven days, the controller 100 may specify the average time of the hot water start time in the past seven days as the hot water start time B1. In addition, the controller 100 may specify the average time of bathing start times in the past seven days as the bathing start time T1 from the driving history for the past seven days.

  Alternatively, the controller 100 specifies the average time of hot water start time in the past 7 days as the first hot water start time from the driving history of the past 7 days, and the driving history in the past 12 weeks from the driving history of the last 12 weeks. The average time of the hot water start time may be specified as the second hot water start time, and the earlier one of the first hot water start time and the second hot water start time may be specified as the hot water start time B1. Moreover, the controller 100 specifies the average time of the bathing start time in the past 7 days as the 1st bathing start time from the driving history for the past 7 days, and starts the bathing in the past 12 weeks from the driving history of the last 12 weeks The average time of time may be specified as the second bathing start time, and the earlier of the first bathing start time and the second bathing start time may be specified as the bathing start time T1.

  Alternatively, the controller 100 may specify, from the operation history of the past 12 weeks, the earliest time among the hot water start times of the day corresponding to the same day of the past 12 weeks as the hot water start time B1. Alternatively, the controller 100 may specify the average time of the hot water start time of the day corresponding to the same day of the past 12 weeks as the hot water start time B1 from the past 12 weeks of the operation history. Further, the controller 100 may specify the earliest time among the bathing start times on the same day of the past 12 weeks as the bathing start time T1 from the driving history of the past 12 weeks. Alternatively, the controller 100 may specify, as the bathing start time T1, the average time of the bathing start times of the days corresponding to the same day of the past 12 weeks from the driving history of the past 12 weeks.

  Alternatively, the controller 100 may make the method of specifying the bathing start time T1 different between when the hot water start instruction of the current day is issued from the remote control 110 and when issued from the mobile terminal device 120. For example, when the start of hot water is instructed from the remote control 110, the controller 100 controls the remote control 110 within the past seven days (or the past 12 weeks) from the driving history of the past seven days (or the past 12 weeks). The earliest time (or the average time of the bathing start times) of the bathing start times of the day on which the start of the hot water bathing is instructed may be specified as the bathing start time T1. In addition, when the start of hot water is instructed from the portable terminal device 120, the controller 100 calculates the driving history of the past seven days (or the past 12 weeks) within the past seven days (or the past 12 weeks). The earliest time (or the average time of the bathing start times) of the bathing start times of the day on which the start of the hot water is instructed from the portable terminal device 120 may be specified as the bathing start time T1.

  As described above, the hot water supply system 2 according to one embodiment includes the tank 10 for storing water, the heat pump 50 for absorbing heat from the natural environment and heating the water, and tank water circulation for circulating water between the tank 10 and the heat pump 50 Path 20 and circulation pump 22 (an example of circulation means), combustion device 60 for heating water by combustion of fuel gas, remote control 110 for instructing start of hot water to bathtub 58 or portable terminal device 120 (hot water indication An example of the apparatus), a human sensor 62 (an example of a bathing detection apparatus) for detecting bathing, and a controller 100 are provided. The hot water supply system 2 can execute a hot water pouring operation of supplying the water of the tank 10 to the bath 58 while heating the water of the tank 10 by the heat pump 50. The controller 100 is configured to estimate the bathing start time T1 of the current day based on the bathing start time of each day in the past first predetermined period (for example, 12 weeks). The controller 100 is configured to set the flow rate of water supplied to the bathtub 58 in the hot water pouring operation of the day based on the starting time of the hot water pouring operation of the day and the bathing start time T1 of the current day estimated. .

  According to the above configuration, the flow rate of water to be supplied to the tub 58 in the hot water pouring operation can be increased if there is sufficient time between the start of the pouring of water to the tub 58 and the start of bathing. By reducing the size, the reduction of high temperature water in the tank 10 can be suppressed. By this, the hot water pouring operation is completed by the bathing start time T1 and heating of water by the combustion device 60 can be suppressed to improve the energy efficiency in the hot water pouring operation while securing convenience for the user.

  In the hot water supply system 2 according to one embodiment, the controller 100 sets a second predetermined period whose length differs from the bathing start time of each day in the past first predetermined period (for example, 12 weeks) and the past first predetermined period. It is comprised so that the bathing start time T1 of the day may be estimated based on the bathing start time of each day in (for example, 7 days).

  According to the above configuration, it is possible to estimate the bathing start time T1 on the day taking into consideration both the past performance in a relatively long period and the past performance in a relatively short period with respect to the bathing start time. it can. The bathing start time T1 of the day can be estimated more appropriately.

  In the hot water supply system 2 according to one embodiment, the controller 100 sets the bathing start time T1 of the current day based on the bathing start time of each day on the same day as the current day in the past first predetermined period (for example 12 weeks). It is configured to estimate.

  Usually, even though the lifestyle of the user may differ depending on the day of the week, the lifestyle is often the same for the same day of the week. According to the above configuration, since the bathing start time T1 of the current day is estimated based on the past results on the same day as the current day, the bathing start time T1 of the current day can be estimated more appropriately.

  In the hot water supply system 2 according to the embodiment, when the controller 100 detects bathing before completing the hot water pouring operation on the day, the flow rate of water supplied to the bathtub 58 in the hot water pouring operation on the day is the maximum flow rate. It is configured to change.

  According to the above configuration, when the user starts bathing earlier than estimated, the hot water filling operation can be completed promptly by setting the flow rate of water supplied to the bathtub 58 as the maximum flow rate. it can. User convenience can be ensured.

(Example 2)
The hot water supply system 202 of the present embodiment has the same configuration as the hot water supply system 2 of the first embodiment shown in FIG. 1, but the contents of the process performed by the controller 100 by learning control and the hot water heating process performed by the controller 100 The content of is different.

(Learning control)
In the hot water supply system 202 of the present embodiment, the controller 100 specifies the time difference from the start of hot water bathing to the start of bathing first as “hot water bathing time difference ΔT1” instead of specifying the bathing start time T1. . Specifically, the controller 100 calculates the time difference from the hot water start time to the bathing start time for the past seven days from the operation history for the past seven days, and in the past seven days, the shortest time difference is calculated The bathing time difference ΔT1 is specified. For example, the controller 100 specifies one hour as the hot water bathing time difference ΔT1 (see FIG. 2).

(Hot water treatment)
In the hot water supply system 202 of this embodiment, when the user instructs to start the hot water heating, the controller 100 starts the hot water heating process of FIG. The hot water treatment of FIG. 6 is substantially the same as the hot water treatment of FIG. 5, but the process of S53 is executed instead of the processes of S50 and S52.

  In S53, the controller 100 specifies the hot water flow rate from the hot water bathing time difference ΔT1 estimated from the past driving results. Specifically, the controller 100 calculates the flow rate for supplying the amount L (for example, 150 L) of the hot water to be supplied to the bathtub 58 in the hot water operation and the hot water bathing time difference ΔT1 to calculate the hot water flow rate. Identify. The processes after S53 are the same as the hot water heating process of FIG.

  In the above, the controller 100 calculates the time difference from the hot water start time to the bathing start time for the past seven days from the operation history for the past seven days, and averages the time difference in the past seven days It may be specified as the time difference ΔT1.

  Alternatively, the controller 100 specifies the average of the hot water bathing time difference in the past seven days as the first hot water bathing time difference from the driving history for the past seven days, and the hot water bath in the past 12 weeks from the driving history in the past 12 weeks. The average of the bathing time difference may be specified as the second hot water bathing time difference, and the shorter one of the first hot water bathing time difference and the second hot water bathing time difference may be specified as the hot water bathing time difference ΔT1.

  Alternatively, the controller 100 may specify the shortest hot water bathing time difference among the hot water bathing time differences on the same day of the past 12 weeks as the hot water bathing time difference ΔT 1 from the driving history of the past 12 weeks. Alternatively, the controller 100 may specify the average of the hot-water bathing time difference of the day corresponding to the same day in the past 12 weeks as the hot-water bathing time difference ΔT1 from the driving history of the past 12 weeks.

  Alternatively, the controller 100 may make the method of specifying the hot water bathing time difference ΔT1 different between when the hot water start command of the current day is issued from the remote control 110 and when it is issued from the mobile terminal device 120. For example, when the start of hot water is instructed from the remote control 110, the controller 100 controls the remote control 110 within the past seven days (or the past 12 weeks) from the driving history of the past seven days (or the past 12 weeks). The shortest hot water bathing time difference (or the average of the hot water bathing time difference) of the day on which the start of the hot water bath is instructed may be specified as the hot water bathing time difference ΔT1. In addition, when the start of hot water is instructed from the portable terminal device 120, the controller 100 calculates the driving history of the past seven days (or the past 12 weeks) within the past seven days (or the past 12 weeks). The shortest hot water bathing time difference (or the average of the hot water bathing time difference) of the day when the start of the hot water beam is instructed from the mobile terminal device 120 may be specified as the hot water bathing time difference ΔT1.

  As described above, the hot water supply system 202 according to the embodiment includes the tank 10 for storing water, the heat pump 50 for absorbing heat from the natural environment and heating the water, and tank water circulation for circulating water between the tank 10 and the heat pump 50 Path 20 and circulation pump 22 (an example of circulation means), combustion device 60 for heating water by combustion of fuel gas, remote control 110 for instructing start of hot water to bathtub 58 or portable terminal device 120 (hot water indication An example of the apparatus), a human sensor 62 (an example of a bathing detection apparatus) for detecting bathing, and a controller 100 are provided. The hot water supply system 202 can execute a hot water pouring operation to supply the water of the tank 10 to the bathtub 58 while heating the water of the tank 10 by the heat pump 50. The controller 100 is based on the time difference from the start time of the hot water pouring operation on each day to the bathing start time in the past first predetermined period (for example, 12 weeks), from the start time to the hot water pouring operation on the day to the bathing start time It is configured to estimate the time difference ΔT1. The controller 100 is configured to set the flow rate of water supplied to the bathtub 58 in the hot water pouring operation on the current day based on the time difference ΔT1 from the start time of the hot water pouring operation on the current day to the bathing start time. .

  According to the above configuration, the flow rate of water to be supplied to the tub 58 in the hot water pouring operation can be increased if there is sufficient time between the start of the pouring of water to the tub 58 and the start of bathing. By reducing the size, the reduction of high temperature water in the tank 10 can be suppressed. By this, the hot water pouring operation is completed by the bathing start time, and the heating of the water by the combustion device 60 can be suppressed and the energy efficiency in the hot water pouring operation can be improved while securing the convenience of the user.

  In the hot water supply system 202 according to the embodiment, the controller 100 determines the time difference between the start time of hot water pouring operation on each day in the past first predetermined period (for example, 12 weeks) and the bathing start time, and the first predetermined period in the past Based on the time difference from the start time of the hot water pouring operation of each day to the bathing start time in the second predetermined period (for example, 7 days) different in length from the starting time of the hot water pouring operation on the day to the bathing start time It is configured to estimate the time difference ΔT1.

  According to the above configuration, regarding the time difference from the start time of the hot water pouring operation to the bathing start time, taking into consideration both the past performance in a relatively long period and the past performance in a relatively short period, It is possible to estimate a time difference ΔT1 from the start time of the hot water operation to the bath start time. It is possible to more appropriately estimate the time difference ΔT1 from the start time of the hot water operation on the day to the bathing start time.

  In the hot water supply system 202 according to one embodiment, the controller 100 sets the time difference from the start time of hot water heating operation on each day when the day is the same as the day in the first predetermined period (for example, 12 weeks) in the past to the bathing start time. Based on this, it is configured to estimate a time difference ΔT1 from the start time of the hot water operation on the day to the bathing start time.

  Usually, even though the lifestyle of the user may differ depending on the day of the week, the lifestyle is often the same for the same day of the week. According to the above configuration, since the time difference ΔT1 from the start time of the hot water operation on the day to the bathing start time is estimated based on the past results on the same day as the day, bathing from the start time of the hot water operation on the day The time difference ΔT1 up to the start time can be estimated more appropriately.

  In the hot water supply system 202 according to one embodiment, when the controller 100 detects bathing before completing the hot water pouring operation on the day, the flow rate of water supplied to the bathtub 58 in the hot water pouring operation on the day is the maximum flow rate. It is configured to change.

  According to the above configuration, when the user starts bathing earlier than estimated, the hot water filling operation can be completed promptly by setting the flow rate of water supplied to the bathtub 58 as the maximum flow rate. it can. User convenience can be ensured.

  In the above-described first and second embodiments, the hot water supply systems 2 and 202 have described the configuration in which the presence or absence of a bather is detected using the human sensor 62. However, detection of the presence or absence of a bather is not limited thereto. It can also be done by For example, a water level sensor for detecting the water level of the bathtub 58 may be provided, and the controller 100 may detect the presence or absence of a bather based on the fluctuation of the water level detected by the water level sensor.

  Although the embodiments of the present invention have been described above in detail, these are merely examples and do not limit the scope of the claims. The art set forth in the claims includes various variations and modifications of the specific examples illustrated above.

  The technical elements described in the present specification or the drawings exhibit technical usefulness singly or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in the present specification or the drawings can simultaneously achieve a plurality of purposes, and achieving one of the purposes itself has technical utility.

2: hot water supply system 10: tank 12: thermistor 14: thermistor 16: thermistor 17: thermistor 18: thermistor 20: tank water circulation path 22: circulation pump 24: thermistor 30: tap water introduction path 30a: first introduction path 30b: second Introduction path 31: tap water supply source 32: thermistor 40: supply path 42: mixing valve 44: thermistor 46: hot water valve 48: bathroom 50: heat pump 52: outside temperature sensor 54: shower 56: caran 58: bathtub 60: combustion Device 62: human sensor 72: heat pump 100: controller 110: remote control 120: portable terminal device 202: hot water supply system

Claims (7)

A tank for storing water,
Heat pump which absorbs heat from natural environment and heats water,
Circulation means for circulating water between the tank and the heat pump;
A combustion device for heating water by combustion of fuel gas;
A hot water indication device for instructing the start of hot water to the bathtub;
A bathing detection device for detecting bathing;
Equipped with a controller,
It is possible to carry out a hot water operation to supply the tank water to the bath while heating the tank water with a heat pump.
The controller is configured to estimate the bathing start time of the day based on the bathing start time of each day in the past first predetermined period,
The controller is configured to set a flow rate of water to be supplied to the bathtub in the hot water operation on the current day based on the start time of the hot water operation on the current day and the bathing start time on the current day estimated .   The controller is based on the bathing start time of each day in the past first predetermined period and the bathing start time of the day based on the bathing start time of each day in the second predetermined period different in length from the past first predetermined period The hot water supply system of claim 1, wherein the hot water supply system is configured to estimate.   The hot water supply system according to claim 1, wherein the controller is configured to estimate the bathing start time of the current day based on the bathing start time of each day having the same day as the current day in the past first predetermined period. A tank for storing water,
Heat pump which absorbs heat from natural environment and heats water,
Circulation means for circulating water between the tank and the heat pump;
A combustion device for heating water by combustion of fuel gas;
A hot water indication device for instructing the start of hot water to the bathtub;
A bathing detection device for detecting bathing;
Equipped with a controller,
It is possible to carry out a hot water operation to supply the tank water to the bath while heating the tank water with a heat pump.
The controller estimates the time difference from the start time of the water heating operation on the day to the bathing start time based on the time difference from the start time of the water heating operation on each day to the bathing start time in the past first predetermined period Is configured and
The controller is configured to set a flow rate of water to be supplied to the bathtub in the hot water pouring operation on the current day based on a time difference from the start time of the hot water pouring operation on the current day to the bathing start time .   The controller sets the time difference between the start time of the hot water pouring operation on each day in the past first predetermined period to the bathing start time, and the hot water on each day in the second predetermined period different in length from the past first predetermined period The hot water supply system according to claim 4, wherein the time difference from the start time of the hot water operation on the current day to the bathing start time is estimated based on the time difference from the start time of driving to the bathing start time.   The controller is based on the time difference from the start time of the hot water pouring operation of each day when the day is the same as the day of the week in the first predetermined period in the past to the bathing start time to the bathing start time 5. The hot water supply system of claim 4, wherein the hot water supply system is configured to estimate a time difference between the two.   The controller is configured to change the flow rate of water supplied to the bathtub in the hot water pouring operation on the day to the maximum flow amount when bathing is detected before the hot water pouring operation on the day is completed. The hot water supply system according to any one of 6.

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