JP2015161492A - Hot water storage water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately control the execution state of a boiling operation in response to an at-home state of a hot water supply user, and improve energy saving performance.SOLUTION: A hot water storage water heater 1 comprises: an HP unit 2; a hot water storage tank 11; a controller 70; a remote controller 71; an HEMS controller 80; an HEMS operation terminal 81, and the like. The controller 70 includes a function to execute a boiling operation and a function to reduce a boiling start hot water volume after passage of the peak of a hot water supply volume if a remaining hot water volume in the hot water storage tank 11 decreases from the boiling start hot water volume. If absentee occurrence information indicating that someone is an absentee during use of the hot water supply is input from the remote controller 71 or the HEMS operation terminal 81, the controller 70 reduces the boiling start hot water volume at earlier time than that when the absentee occurrence information is not input. This can avoid excessive boiling operation for securing a hot water volume by which the absentee may use the hot water.

Description

  The present invention relates to a hot water storage type water heater equipped with a hot water storage tank for storing hot water and having a function of performing a boiling operation when the amount of remaining hot water in the hot water storage tank decreases.

  As a conventional technique, for example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2010-175199), for example, stored in a hot water storage tank for a hot water supply destination including a shower, a kitchen faucet, a washroom faucet, and the like. Hot water storage water heaters that supply hot water are widely used. In the prior art, in order to prevent running out of hot water when bathing in a bathtub or taking a bath, the number of people who plan to bathe (number of users) is input from the remote controller, and additional boiling time is scheduled. Is set as a function of the number of users. As a specific example, the target hot water amount to be actually set is selected according to the number of users among “large”, “rely”, and “small”, which are the approximate hot water amounts desired by the user.

JP 2010-175199 A

  However, in the conventional technique described in Patent Document 1 described above, even if the additional boiling time is changed, the threshold value of the remaining hot water amount at which boiling is started may be too high. In this case, there is a possibility that an unnecessary boiling operation may be performed even when the number of users is small compared to the normal time, and the operation efficiency of the water heater is reduced.

  The present invention has been made to solve the above-described problems. For example, it is possible to appropriately control the execution state of the boiling operation according to the hot water user's home condition, and to improve the energy saving performance. The purpose is to provide a hot water storage hot water heater.

  A hot water storage type hot water supply apparatus according to the present invention includes a hot water storage tank for storing hot water, a heating device capable of performing a boiling operation for increasing the amount of remaining hot water in the hot water storage tank by heating the hot water in the hot water storage tank, When the amount of remaining hot water in the hot water storage tank is less than the preset amount of hot water to start boiling, the control means for performing the heating operation by the heating device and the absence of the hot water user Information input means for inputting information on absentees as absentee occurrence information, and means for reducing the amount of hot water that starts boiling after the peak of the amount of hot water supplied from the hot water tank to the outside passes. And boil start hot water amount varying means for reducing the boil start hot water amount at an earlier time than when no information is input.

  According to the present invention, when hot water is supplied in the presence of an absentee, it is possible to reduce the amount of boiling start hot water at an earlier time compared to the case where there is no absentee, depending on whether there is an absentee, etc. The switching timing of the boiling start hot water amount can be appropriately changed. Therefore, it is possible to appropriately control the running state of the boiling operation according to the hot water user's home condition, avoiding the extra boiling operation to ensure the amount of hot water used by the absent person, and improving the energy saving performance Can be made.

It is a block diagram which shows the hot water storage type water heater by Embodiment 1 of this invention. It is a timing chart which shows an example of the boiling start setting control performed when absentee generation | occurrence | production information is not input. It is a timing chart which shows an example of the boiling start setting control performed when absentee generation | occurrence | production information is input. It is a timing chart which shows another example of the boiling start setting control performed when absentee generation | occurrence | production information is input. In Embodiment 1 of this invention, it is a flowchart which shows an example of a boiling start setting control.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description shall be abbreviate | omitted. In the embodiment, a hot water storage type hot water heater will be described as an example of the hot water heater of the present invention.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water storage type water heater according to Embodiment 1 of the present invention. As shown in this figure, a hot water storage type water heater 1 according to the present embodiment includes an HP unit 2 and a tank unit 10. The HP unit 2 is a heating device for heating the low-temperature water introduced from the tank unit 10, and the compressor 3, the water / refrigerant heat exchanger 4, the expansion valve 5 and the air heat exchanger 6 are annularly formed by a refrigerant pipe 7. To form a refrigerant cycle (heat pump cycle). The water-refrigerant heat exchanger 4 exchanges heat between the low-temperature water introduced from the tank unit 10 and the high-temperature refrigerant flowing through the refrigerant pipe 7. In addition, the heating apparatus of this invention is not limited to HP unit 2, For example, you may comprise with an electric heater etc.

  The tank unit 10 contains the following components and pipes including the hot water storage tank 11. The hot water storage tank 11 is a tank for storing hot water, and a water inlet 11 a and a water outlet 11 b are provided in the lower part of the hot water tank 11. A first branch pipe 12a of the water supply pipe 12 is connected to the water introduction port 11a. Low temperature water such as city water is supplied to the water supply pipe 12 with the pressure adjusted by the pressure reducing valve 13. The low-temperature water supplied to the water supply pipe 12 is supplied from the first branch pipe 12a to the hot water storage tank 11 as necessary, and is also supplied from the second branch pipe 12b to the mixing valves 30, 31 described later. In the hot water storage tank 11, low temperature water is introduced from the water introduction port 11 a and high temperature water is introduced from the hot water introduction outlet 11 d, so that the temperature of the hot water gradually decreases from the upper side toward the lower side. A stratification is formed. On the other hand, a hot water introduction port 11 c is provided at the center or lower part of the hot water storage tank 11, and a hot water introduction outlet 11 d is provided at the upper part of the hot water storage tank 11.

  Next, other devices constituting the hot water storage type hot water heater 1 will be described. First, a three-way valve 14 and a four-way valve 15 are arranged inside the tank unit 10. The three-way valve 14 is configured by an electromagnetic flow path switching valve or the like, and includes a and b ports through which hot water flows and a c port through which hot water flows out. The flow path of the three-way valve 14 is switched between two paths (ac path, bc path). The four-way valve 15 is configured by an electromagnetic flow path switching valve or the like, and includes b and c ports through which hot water flows and a and d ports through which hot water flows out. The flow path of the four-way valve 15 is switched between four paths (ab path, ac path, bd path, and cd path).

  Here, first, a circuit configuration related to the boiling function will be described. The water outlet 11 b of the hot water storage tank 11 is connected to the a port of the three-way valve 14 via the water outlet pipe 20. The c port of the three-way valve 14 is connected to the secondary side inlet of the HP unit 2 (water-refrigerant heat exchanger 4) via the HP forward piping 21. Further, the HP outgoing pipe 21 is provided with a heat source pump 22 for circulating hot water through each pipe in the tank unit 10. The outlet on the secondary side of the HP unit 2 is connected to the c port of the four-way valve 15 via the HP return pipe 23. The d port of the four-way valve 15 is connected to the hot water introduction outlet 11 d of the hot water storage tank 11 through the hot water supply pipe 24. Further, a portion of the HP going pipe 21 downstream of the heat source pump 22 is connected to the b port of the four-way valve 15 via the bypass pipe 25, and the a port of the four-way valve 15 is connected to the tank return pipe 26. The hot water storage tank 11 is connected to the hot water inlet 11c.

  Next, a circuit configuration related to the hot water supply function will be described. Inside the tank unit 10, mixing valves 30, 31 and the like are arranged. The mixing valves 30 and 31 are connected to the hot water introduction outlet 11 d of the hot water storage tank 11 via the tank side hot water supply pipe 32. The mixing valves 30 and 31 mix the high temperature water supplied from the upper part of the hot water storage tank 11 through the tank side hot water supply pipe 32 and the low temperature water supplied through the second branch pipe 12 b of the water supply pipe 12. Thus, warm water having an intermediate temperature suitable for hot water supply is generated. One mixing valve 30 is connected to a hot water supply terminal 34 via a terminal-side hot water supply pipe 33, and supplies the generated hot water to the hot water supply terminal 34. The hot water supply terminal 34 is constituted by a faucet such as a shower and a currant. The other mixing valve 31 is connected to a later-described bath return pipe 52 via a bath-side hot water supply pipe 35 and a bath electromagnetic valve 36, and supplies the generated hot water to the bath return pipe 52.

  Next, a circuit configuration related to the tracking function will be described. A bath heat exchanger 40 and the like are disposed inside the tank unit 10. The bath heat exchanger 40 is a heat exchanger for heating water to be heated on the secondary side (tub water, heating water, etc.) using the high temperature water supplied from the hot water storage tank 11 and the HP unit 2. is there. In this Embodiment, the system which uses bathtub water as heating object water is illustrated. The bath heat exchanger 40 heats the bathtub water by exchanging heat between the hot water in the hot water storage tank 11 and the bathtub water stored in the bathtub 50 described later.

  The primary side inlet of the bath heat exchanger 40 is connected to the hot water supply pipe 24 via the bath primary side inflow pipe 41. The primary side outlet of the bath heat exchanger 40 is connected to the b port of the three-way valve 14 via the bath primary side outflow pipe 42. The secondary side of the bath heat exchanger 40 is connected to the bathtub side as described later. On the other hand, the bathtub 50 is connected to the secondary inlet of the bath heat exchanger 40 through the bath piping 51 and is connected to the secondary side of the bath heat exchanger 40 through the bath return piping 52. Connected to the outlet. Further, the bath piping 51 is provided with a bath water circulation pump 53 that circulates bath water between the bath 50 and the bath heat exchanger 40 via the piping 51 and 52.

  Next, the control system of the hot water storage type hot water heater 1 will be described. The system of the present embodiment includes a sensor system, a control device 70, a remote controller (remote controller) 71, a HEMS controller 80, a HEMS operation terminal 81, and the like. The sensor system includes tank temperature sensors 60 and 61, a hot water supply flow rate sensor 62, a bath flow rate sensor 63, and a bath water temperature sensor 64 and 65. The tank temperature sensors 60 and 61 are attached to the hot water storage tank 11 at different height positions, and detect the hot water temperature of the hot water storage tank 11 at the positions. The control device 70 can detect the amount of remaining hot water (heat amount) in the hot water storage tank 11 based on detection signals from the tank temperature sensors 60 and 61.

  The hot water supply flow sensor 62 detects the flow rate of hot water supplied from the mixing valve 30 to the hot water supply terminal 34, and the bath flow sensor 63 detects the flow rate of hot water supplied from the mixing valve 31 to the bath return pipe 52. . The hot water flow rate sensor 62 and the bath flow rate sensor 63 constitute detection means for detecting the amount of hot water (hot water supply amount) supplied from the hot water storage tank 11 to the outside. The bath water temperature sensors 64 and 65 detect the temperature of hot water flowing out of the bathtub 50 and the temperature of hot water flowing out of the bath heat exchanger 40, respectively.

  The control device 70 corresponds to control means for controlling the hot water storage type water heater 1 and is constituted by a microcomputer or the like. The control device 70 includes a storage circuit including a ROM, a RAM, and a nonvolatile memory, an arithmetic processing device (CPU) that executes a program stored in the storage circuit, and an input / output that inputs and outputs signals to the arithmetic processing device. And a port. Each sensor of the sensor system is connected to the input side of the control device 70. Various actuators including the three-way valve 14, the four-way valve 15, the heat source pump 22, the mixing valves 30 and 31, the bath solenoid valve 36, the bathtub water circulation pump 53 and the like are connected to the output side of the control device 70.

  The remote controller 71 is operated by a hot water user or the like, and is an operation terminal for setting the operation of the hot water storage type water heater 1. The remote controller 71 is connected to the control device 70 by wire or wireless and has a function of performing data communication with the control device 70. The remote controller 71 includes an operation unit on which switches and the like for performing various settings are arranged, a display unit for displaying an operation state of the hot water storage hot water heater 1, and a microphone and a speaker.

  A HEMS (Home Energy Management System) controller 80 comprehensively controls the power usage state in the home, and is configured by a microcomputer or the like and has a function of performing data communication with the control device 70. The HEMS controller 80 is connected to a HEMS operation terminal 81 for confirming the power usage state, power supply information, etc., and performing various operations and settings. The HEMS controller 80 is connected to a power measuring device 82 that measures the amount of power used in the home and an electric device 83 such as an air conditioner disposed in the home. The control device 70 executes various operations and controls described below by driving each actuator based on the input signal from the sensor system, the setting by the remote controller 71, and the input data from the HEMS controller 80. .

(Boiling operation)
The boiling operation is for heating (boiling) hot water in the hot water storage tank 11 by the HP unit 2 and increasing the amount of remaining hot water in the hot water storage tank 11. During the boiling operation, the three-way valve 14 is switched to the ac path, and the four-way valve 15 is switched to the cd path to constitute a boiling circuit. From the water outlet 11b of the hot water storage tank 11, the boiling circuit is connected to the water outlet pipe 20, the three-way valve 14, the HP outgoing pipe 21, the heat source pump 22, the water refrigerant heat exchanger 4, the HP return pipe 23, the four-way valve 15 and the feed. This circuit reaches the hot water inlet / outlet 11d of the hot water storage tank 11 via the hot water pipe 24 in sequence. During the boiling operation, the HP unit 2 and the heat source pump 22 are operated after the boiling circuit is configured. Thereby, low-temperature water flows out from the water outlet 11b of the hot water storage tank 11, and this low-temperature water is heated by the HP unit 2 while flowing through the boiling circuit, and then hot water in the hot water storage tank 11 is heated. It is returned to the introduction outlet 11d.

(Hot water operation)
The hot water supply operation is performed when a hot water user operates the hot water supply terminal 34 and supplies hot water at a desired temperature to the hot water supply terminal 34. When the hot water supply terminal 34 is opened, hot water flows through the tank side hot water supply pipe 32 and the terminal side hot water supply pipe 33, and this flow is detected by the hot water supply flow rate sensor 62. As a result, the control device 70 controls the mixing valve 30 to adjust the mixing ratio of the high-temperature water supplied from the tank-side hot water supply pipe 32 and the low-temperature water supplied from the second branch pipe 12b. Hot water having an intermediate temperature set by the remote controller 71 is supplied from the terminal-side hot water supply pipe 33 to the hot water supply terminal 34. On the other hand, when a hot water supply request is made on the bathtub 50 side for hot water filling or the like, similar to the mixing valve 30, hot water having an intermediate temperature is generated by the mixing valve 31. The hot water is supplied to the bathtub 50 via the side hot water supply pipe 35, the bath solenoid valve 36, the bath return pipe 52, and the like.

(Tub water reheating operation)
The bathtub water reheating operation heats (reheats) the bathtub water using high-temperature water in the hot water storage tank 11. In the bathtub water purging operation, first, the three-way valve 14 is switched to the bc path, and the four-way valve 15 is switched to the ab path. In this state, the heat source pump 22 and the bath water circulation pump 53 are operated. As a result, the high temperature water is taken out from the hot water introduction outlet 11d of the hot water storage tank 11 to the hot water supply pipe 24, and this high temperature water is supplied to the primary side inflow pipe 41 and the primary side flow path of the bottom heat exchanger 40, The primary side outflow pipe 42, the three-way valve 14, a part of the HP outgoing pipe 21, the heat source pump 22, the bypass pipe 25, the four-way valve 15, and the tank return pipe 26 are sequentially passed to the hot water inlet 11c of the hot water storage tank 11. Inflow. On the other hand, the bathtub water flows out of the bathtub 50 and returns to the bathtub 50 via the bath piping 51, the bath water circulation pump 53, the secondary flow path of the bath heat exchanger 40 and the bath return pipe 52 in order. . At this time, since the bathtub water is heated by exchanging heat with the high-temperature water on the primary flow path side in the bath heat exchanger 40, the bathtub water is replenished.

(Boiling start setting control)
The control device 70 determines the magnitude relationship between the amount of remaining hot water in the hot water storage tank 11 and a preset amount of boiling start hot water, and performs a boiling operation when the amount of remaining hot water decreases below the amount of boiling start hot water. . The boiling start hot water amount is variably set based on the hot water supply amount. For example, as shown in FIG. 2, the hot water start hot water amount is maintained at the first start hot water amount until the peak of the hot water supply amount passes within one day. It is set to decrease to the second starting hot water amount after the peak of the amount has passed. FIG. 2 is a timing chart showing an example of the boiling start setting control that is executed when no absentee generation information described later is input.

  More specifically, the control device 70 sets a centralized hot water supply determination value based on, for example, past results of the continuous hot water supply amount stored in the storage circuit. Here, the continuous hot water supply amount is defined as the total hot water supply amount during a period in which hot water supply is continuously performed. Further, the central hot water supply determination value corresponds to the maximum value of the continuous hot water supply amount, and is set as a value correlated with the maximum value, for example. When the continuous hot water supply amount exceeds the central hot water determination value, it is determined that, for example, a large amount of continuous hot water supply (hereinafter referred to as central hot water supply) is being performed. FIG. 2 illustrates a case where, for example, three times of hot water supply are executed, and the first hot water supply is centralized hot water supply. The continuous hot water supply amount is expressed as the area of the shaded portion in FIG.

  In such a state where the concentrated hot water supply determination value is set, the control device 70 detects the continuous hot water supply amount based on the outputs of the hot water supply flow sensor 62 and the bath flow sensor 63, and the like. Then, as shown in FIG. 2, the boiling start hot water amount is set to the first start hot water amount in a time period until the detected value of the continuous hot water supply exceeds the central hot water determination value within one day. Moreover, in the time zone after the detection value of the continuous hot water supply amount exceeds the central hot water supply determination value, the boiling start hot water amount is set to a second start hot water amount that is smaller than the first start hot water amount.

  Here, the first start hot water amount is defined as the boiling start hot water amount that can correspond to the maximum value of the continuous hot water supply amount estimated based on the past hot water supply results, for example. That is, in the state where the remaining hot water amount in the hot water storage tank 11 is reduced to the first starting hot water amount, even if hot water supply corresponding to the maximum value is performed by hot water or the like, for example, immediately after the end of the central hot water supply. If the boiling operation is started, it is possible to avoid running out of hot water. Further, the second starting hot water amount is defined as, for example, a boiling starting hot water amount that can correspond to a second peak value that is next to the maximum value among the continuous hot water supply amounts.

  According to the control shown in FIG. 2, after the peak of the hot water supply amount due to the central hot water supply has passed, the boiling start hot water amount can be reduced from the first start hot water amount to the second start hot water amount, thereby raising the boiling operation. Execution frequency can be reduced.

(Control corresponding to absentees)
Next, setting control of the amount of boiling start hot water when there is an absentee will be described. At least one of the remote controller 71 and the HEMS operation terminal 81 constitutes the information input means of the present embodiment. This operation terminal has a function of registering the total number of hot water users who are family members in advance, and when an absent person occurs due to going out among hot water users, the number of absent persons is used as absentee occurrence information. It has a function to input.

  FIG. 3 is a timing chart illustrating an example of the boiling start setting control executed when absentee generation information is input. As shown in this figure, in the present embodiment, when absentee generation information is input, the first amount of boiling start hot water is set at a time earlier than when no information is input (FIG. 2). The starting hot water amount is decreased to the second starting hot water amount. As a specific example of this control, when absentee generation information is input, the concentrated hot water supply determination value is decreased by an estimated decrease value of the hot water supply amount as compared to when the information is not input.

  Here, the estimated decrease value of the hot water supply amount is an estimate of the decrease value of the continuous hot water supply amount caused by the presence of absentees. For example, the number of absentees obtained from absentee occurrence information and the number of absentees per person It is calculated as a product of the amount of hot water used (= the number of absent persons × the amount of hot water used). The amount of hot water used by each absentee is set in advance or calculated based on past hot water supply results. For example, when the amount of hot water used for showers per person is assumed, the amount of hot water is about 50 liters. Is set.

  According to the above control, when concentrated hot water supply is performed in the presence of an absent person, the timing at which it is determined that the concentrated hot water supply is earlier than the estimated decrease value compared to the case where there is no absent person. Thereby, the more the number of absentees, the earlier the timing for switching the boiling start hot water amount from the first start hot water amount to the second start hot water amount. It can be appropriately changed according to the amount of hot water used. Therefore, it is possible to appropriately control the execution state of the boiling operation according to the hot water user's home condition, to avoid an extra boiling operation, and to improve the energy saving performance.

  In addition, since the second starting hot water amount is set so as to be able to correspond to the second largest peak value next to the maximum value among the continuous hot water supply amounts, even after the peak of the hot water amount due to the concentrated hot water has passed, The amount of remaining hot water adapted to the second peak can be secured in the hot water storage tank 11, and the number of times of boiling operation can be suppressed while avoiding running out of hot water.

  In the present embodiment, since at least one of the remote controller 71 and the HEMS operation terminal 81 is used as information input means for absentee occurrence information, the absentee occurrence information can be input using an existing operation terminal. In addition, in this Embodiment, when the number of people larger than the total number of the hot water users registered beforehand is input as absentee generation | occurrence | production information, it is good also as a structure which prohibits the reception of the said input. According to this configuration, it is possible to prevent an input error of absentee occurrence information and a hot water shortage caused by the input error.

  In the control shown in FIG. 3, the boiling start hot water amount is switched from the first start hot water amount to the second start hot water amount when the absentee occurrence information is input. The starting hot water amount may be switched as shown in FIG. FIG. 4 is a timing chart showing another example of the boiling start setting control executed when absentee generation information is input. In the control shown in this figure, when the absentee occurrence information is input, from the time when the detected value of the continuous hot water supply exceeds the concentrated hot water supply determination value to the time when it exceeds the concentrated hot water supply determination value used when no absentee occurrence information is input. In the time zone, the boiling start hot water amount is set to the third start hot water amount.

  Here, the third starting hot water amount is set to a value smaller than the first starting hot water amount and larger than the second starting hot water amount. Further, in the boiling start setting control shown in FIG. 4, the boiling start hot water amount is set in the time zone after the detected value of the continuous hot water supply exceeds the central hot water determination value used when no absentee occurrence information is input. Set to 2 starting hot water volume.

  According to the boiling start setting control, the same effect as the control of FIG. 3 described above can be obtained. Moreover, even when the amount of hot water used by the absentee is not large, a remaining hot water amount that is greater than or equal to the third starting hot water amount, that is, a remaining hot water amount that is larger than the second starting hot water amount, can be secured in the hot water storage tank 11. More hot water can be prevented than in the case of control.

  Next, a specific process for realizing the boiling start setting control according to the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing an example of boiling start setting control in Embodiment 1 of the present invention. In the routine shown in this figure, first, a first starting hot water amount is set in step S1, and in step S2, a second starting hot water amount smaller than the first starting hot water amount is set. These starting hot water amounts are set by the method described above.

  Next, in step S3, by checking whether or not the absentee generation information is input to the remote controller 71 or the HEMS operation terminal 81, an absentee of the day is generated among hot water users registered in advance. It is determined whether or not. If it is determined in step S3 that no absentee occurrence information has been input (no absentee), the process proceeds to step S4, whether or not the assumed maximum concentrated hot water amount has been used, that is, the amount of continuous hot water supply. It is determined whether or not the detected value exceeds the central hot water supply determination value when there is no absentee.

  Then, if the determination in step S4 is not established, it is determined that the continuous hot water supply amount exceeding the central hot water determination value in the case where there is no absent person has not yet been detected, and the peak of the central hot water supply has not passed. Therefore, in this case, the process proceeds to step S5, and the boiling start hot water amount is set to the first start hot water amount. On the other hand, when the determination in step S4 is established, the amount of continuous hot water supply exceeding the central hot water determination value in the case of no absent person is detected, and it is determined that the peak of central hot water has passed. Therefore, in this case, in step S6, the boiling start hot water amount is set by switching from the first start hot water amount to the second start hot water amount, and the boiling start hot water amount is decreased. The processes in steps S3 to S6 correspond to the control shown in FIG.

  On the other hand, when the determination in step S3 is established, absentee generation information is input, and an absentee is generated among the hot water users, and the process proceeds to step S7. In step S7, it is determined whether or not the amount of hot water reduced from the assumed maximum concentrated hot water amount by the reduction width α has been used, that is, whether or not the detected value of the continuous hot water supply amount has exceeded the central hot water determination value when there is an absent person. Determine. Here, the decrease width α corresponds to the estimated decrease value of the hot water supply amount described above, and the amount of hot water that the absentee should have used (for example, about 50 liters per person for a shower) and the number of absentees, Is set corresponding to. Accordingly, the concentrated hot water supply determination value when there is an absent person is set smaller than the concentrated hot water determination value when there is no absent person by a decrease width α.

  If step S7 is not established, it is determined that the continuous hot water supply amount exceeding the central hot water determination value in the case of the absence of an absent person has not yet been detected and the peak of the central hot water supply has not passed. And the boiling start hot water amount is set to the first start hot water amount. On the other hand, if the determination in step S7 is established, the amount of continuous hot water supply exceeding the central hot water determination value in the case of the absence is detected, and it is determined that the peak of central hot water has passed. Therefore, in this case, the boiling start hot water amount is set by switching from the first start hot water amount to the second start hot water amount in step S9, and the boiling start hot water amount is decreased. Note that the processing of steps S3, S7 to S9 corresponds to the control shown in FIG. As shown in this figure, when there is an absent person, the timing for switching from the first starting hot water amount to the second starting hot water amount is earlier by the amount by which the concentrated hot water supply determination value is decreased.

  However, if the absentee is a person who does not normally use the assumed maximum concentrated hot water volume, for example, even if the absentee is out, the possibility of other hot water users performing the same concentrated hot water supply as usual There is. In this case, if the boiling start hot water amount is set to the second start hot water amount, the hot water may run out. For this reason, in this Embodiment, you may perform the process of step S10-S12 after the process of step S9.

  To describe this process, first, in step S10, after the amount of hot water reduced from the assumed maximum concentrated hot water amount by the reduction width α is used, the amount of hot water that is assumed to be used by an absentee, that is, the amount of hot water supplied is determined. It is determined whether or not the amount of hot water corresponding to the estimated decrease value has been used. In other words, the determination in step S10 continues the hot water supply even after the continuous hot water supply amount exceeding the concentrated hot water supply determination value when there is an absent person is detected, and continuously exceeds the concentrated hot water supply determination value when there is no absent person. It is determined whether or not the amount of hot water is detected.

  And when determination of step S10 is not materialized, since the absentee's usual amount of hot water used is small, even if an absentee occurs, it is judged that the amount of continuous hot water supply by other hot water users is large. Therefore, in this case, the process proceeds to step S11, and the third starting hot water amount is set as a value obtained by adding the increase width β to the second starting hot water amount. In step S12, the boiling start hot water amount is set to the third start hot water amount. Here, the increase width β is, for example, a level that does not cause hot water in the hot water storage tank 11 even in a situation where the amount of hot water normally used by an absentee is small and the amount of continuous hot water supply by other hot water users is large. It is set to a value that can secure the remaining amount of hot water. Further, the third starting hot water amount is set to a value smaller than the first starting hot water amount and larger than the second starting hot water amount.

  On the other hand, when the determination in step S10 is established, it is determined that the peak of the concentrated hot water supply has passed regardless of the amount of hot water used by the absent person. Therefore, in step S13, the boiling start hot water amount is set to the second starting hot water amount. Set to. Here, the processing of steps S10 to S13 corresponds to the control shown in FIG. As described above, according to the control shown in FIG. 5, the above-described boiling start setting control can be smoothly executed, and the energy saving performance of the hot water storage type hot water heater 1 can be improved.

  In the first embodiment, the processing shown in steps S1 to S13 in FIG. 5 shows a specific example of the boiling start hot water amount varying means. The processing shown in steps S4, S7, and S10 shows a specific example of the determination value setting means.

  Moreover, in the said Embodiment 1, it was set as the structure which calculates the estimated decrease value of the hot_water | molten_metal supply amount in the case of an absentee based on the number of absentees, and the amount of hot water used per absentee. However, the present invention is not limited to this, and the configuration may be such that only the presence or absence of absentees is input as absentee generation information regardless of the number of absentees. In this case, the estimated decrease value of the hot water supply amount may be configured to be switched between zero and a specified value according to the presence or absence of an absent person.

  In the first embodiment, for example, when there are a plurality of absent persons, the boiling start hot water amount is set to a fourth start hot water amount that is smaller than the third start hot water amount and larger than the second start hot water amount. It is good. According to this configuration, it is possible to reduce the amount of hot water to be started up in an earlier time zone, so that energy saving can be promoted. Further, in the present invention, when there are a plurality of absentees, the same processing as that in the case of one absentee may be performed.

  As mentioned above, although the hot water storage type hot water heater according to the present invention has been exemplified in the first embodiment, the present invention is not limited to the configuration including all the processes shown in the first embodiment as described above. A configuration for performing only a part of the processing is also included.

DESCRIPTION OF SYMBOLS 1 Hot water storage type water heater, 2 HP unit (heating apparatus), 10 Tank unit, 11 Hot water storage tank, 12 Water supply piping, 14 Three-way valve, 15 Four-way valve, 20 Water outlet piping, 21 HP outgoing piping, 22 Heat source pump, 23 HP Return piping, 24 hot water supply piping, 30, 31 mixing valve, 32 tank side hot water supply piping, 33 terminal side hot water supply piping, 34 hot water supply terminal, 35 bath side hot water supply piping, 36 bathing solenoid valve, 40 bathing heat exchanger, 41 Bath primary side inflow piping, 42 Bath primary side outflow piping, 50 bathtubs, 51 bath forward piping, 52 bath return piping, 53 bath water circulation pump, 60, 61 tank temperature sensor, 62 hot water flow sensor, 63 bath flow sensor, 70 control device (control means), 71 remote control (information input means), 80 HEMS controller, 81 HEMS operation terminal (information Input means), 82 power measuring device, 83 electrical equipment

Claims (6)

A hot water storage tank for storing hot water,
A heating device capable of performing a boiling operation for increasing the amount of remaining hot water in the hot water storage tank by heating the hot water in the hot water storage tank;
Control means for executing the boiling operation by the heating device when the remaining hot water amount in the hot water storage tank is less than a preset boiling start hot water amount;
An information input means for inputting information on the absentee as absentee occurrence information when an absentee is generated among hot water users;
Means for reducing the amount of hot water to be heated after the peak of the amount of hot water supplied from the hot water storage tank to the outside passes, and when the absentee occurrence information is input to the information input means, Boiling start hot water amount variable means for reducing the boiling start hot water amount at a time earlier than that at the time of non-input;
Hot water storage water heater equipped with.   The information input means is operated by at least one operation terminal among a remote control that is an operation terminal for setting the operation of the hot water storage water heater and a HEMS operation terminal connected to a HEMS controller that controls a power usage state in the home. The hot water storage type hot water supply device according to claim 1, which is configured. Based on the past results of the continuous hot water supply amount, which is the total hot water supply amount during a period in which hot water supply is continuously performed, a centralized hot water supply determination value corresponding to the maximum value of the continuous hot water supply amount is set, and the absentee occurrence information is A determination value setting means for reducing the concentrated hot water determination value by the amount of hot water used by the absent person when compared with when the information is not input;
The boiling start hot water amount variable means corresponds to the boiling start hot water amount corresponding to the maximum value of the continuous hot water supply during a time period until the detected value of the continuous hot water supply exceeds the central hot water determination value within one day. The first start hot water amount is set to a possible first hot water amount, and the boiling start hot water amount is smaller than the first start hot water amount in a time zone after the detected value of the continuous hot water supply exceeds the central hot water determination value. The hot water storage type hot water supply device according to claim 1 or 2, wherein the hot water supply type is set to a starting amount of hot water.   When the absentee occurrence information is input, the boiling start hot water amount varying means is a concentration used when the absentee occurrence information is not input after the detected value of the continuous hot water supply exceeds the concentrated hot water determination value. In the time period until the hot water supply determination value is exceeded, the boiling start hot water amount is set to a third start hot water amount that is smaller than the first start hot water amount and larger than the second start hot water amount, and the continuous hot water amount The said boiling start hot water amount is set to the said 2nd start hot water amount in the time slot | zone after a detection value exceeds the concentrated hot water supply determination value used at the time of the non-input of the said absentee generation | occurrence | production information. Hot water storage water heater.   The hot water storage hot water supply apparatus according to claim 3 or 4, wherein the second start hot water amount is a boiling start hot water amount that can correspond to a second peak value that is next to the maximum value among the continuous hot water supply amounts.   The information input means has a function of registering the total number of hot water users in advance and a function of inputting the number of absentees as the absentee occurrence information, which is larger than the total number of hot water users. The hot water storage type hot water supply apparatus according to any one of claims 1 to 5, wherein when the number of persons is input as the absentee generation information, reception of the input is prohibited.

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