JP2008292020A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a storage water heater capable of easily suppressing fluctuation of the temperature of hot water supplied to a hot water supply destination to which hot water supply is started first even when hot water supply to the other hot water supply destination is started in the middle of hot water supply to the first hot water supply destination. <P>SOLUTION: In the storage water heater 20, first and second hot water and water mixing valves 9a, 9b are provided in a hot water supply pipe line 7 for sending hot water from a hot water storage tank 1 to first and second hot water supply destinations, and hot water temperatures at the respective hot water supply destinations are controlled by controlling openings of the respective hot water and water mixing valves 9a, 9b by a control part 15. When hot water supply to the second hot water supply destination is started in the middle of hot water supply to the first hot water supply destination, the control part 15 corrects the opening of the first hot water and water mixing valve by using temperatures of hot water and water sent to the respective hot water and water mixing valves 9a, 9b, a detection result of a flow rate sensor 11a arranged on the downstream side of the first hot water and water mixing valve, the temperature of hot water supplied to the first hot water supply destination, the start opening of the second hot water and water mixing valve and information indicating a relationship between the opening of the first hot water and water mixing valve and detection temperature of a temperature sensor 13c during simultaneous supply of hot water to the respective hot water supply destinations. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus equipped with an electric hot water mixing valve.

  Nowadays, it has become common to supply hot water from a single hot water storage type hot water supply device to a plurality of places such as a kitchen and a bathroom. For this reason, many hot water storage type hot water supply apparatuses are provided with a hot water mixing valve and a temperature sensor corresponding to each hot water supply destination, and the opening degree of the hot water mixing valve is determined using the detection result of each temperature sensor. A control unit is provided that controls separately and controls the hot water supply temperature at each hot water supply destination to the temperature set by the user. However, even if the control unit controls the opening of each hot water / water mixing valve, if hot water supply is started or stopped at another hot water supply destination while hot water supply is being performed at a hot water supply destination, The hot water supply temperature at the hot water supply destination that has started the operation may temporarily fluctuate.

  In order to suppress the occurrence of such a problem, for example, in the hot water storage type hot water supply apparatus described in Patent Document 1, hot water supply using the second mixing valve is performed when hot water supply using the first mixing valve is performed. Is started or stopped, the opening degree of the first mixing valve is automatically corrected based on the set temperature of the hot water supply using the first mixing valve and the set temperature of the hot water supply using the second mixing valve is doing. When there is no difference between the set temperature of the hot water supply using the first mixing valve and the set temperature of the hot water supply using the second mixing valve, the above correction is not performed. The opening degree of the first mixing valve is corrected based on the data of the temperature difference-mixing opening degree correction amount and the two set temperatures.

JP-A-2005-180860

  However, since there is usually one hot water storage tank provided in the hot water storage type hot water supply device, for example, if the hot water tap of the bathtub is opened while hot water is supplied from the faucet provided in the sink of the kitchen, the hot water temperature at the faucet Even if the hot water supply temperature at the hot water tap is set to the same temperature, the hot water supply temperature at the faucet may be lowered as a result of a decrease in the amount of hot water supplied from the hot water storage tank to the faucet hot water mixing valve. In the hot water storage type hot water supply apparatus described in Patent Document 1, such fluctuations in the hot water supply temperature cannot be suppressed. Regardless of whether or not the hot water supply temperature at the first hot water supply destination and the hot water supply temperature at the second hot water supply destination are the same as each other, when the amount of hot water supply at the hot water supply destination that has started hot water supply is small, the above-mentioned Such temperature fluctuations are particularly likely to occur.

  The present invention has been made in view of the above circumstances, and even if hot water supply is started at another hot water supply destination while hot water supply is being performed at a hot water supply destination, the hot water supply destination that has started hot water supply first An object of the present invention is to obtain a hot water storage type hot water supply device that can easily suppress fluctuations in hot water supply temperature in the country.

  In the hot water storage type hot water supply apparatus of the present invention that achieves the above object, a hot water supply pipe having first and second auxiliary hot water supply pipes is connected to a hot water storage tank in which hot water obtained by heating water with a heat source machine is stored. The first hot water / water mixing valve is provided in the first auxiliary hot water supply line, and the second hot water / water mixing valve is provided in the second auxiliary hot water supply line. By controlling the opening degree of each of the two hot water mixing valves by the control unit, the hot water supply temperature at the first hot water supply destination connected to the first sub hot water supply line and the second sub hot water supply pipe were connected. A hot water storage type hot water supply apparatus for controlling a hot water supply temperature at a second hot water supply destination, a tank hot water temperature sensor for detecting a temperature of hot water supplied from a hot water storage tank to a hot water supply pipe, and water flowing through the water supply pipe A water temperature sensor for detecting the temperature and the first and second hot water / water mixing valves are arranged downstream of the first and second hot water / water mixing valves. A temperature sensor for detecting the temperature of the water, a flow rate sensor for detecting the flow rate of hot water that is arranged downstream of each of the first and second hot water / mixing valves and that flows through the portion, and a controller that is connected to the controller. An operation unit that functions as an information input device that specifies the control content of the opening degree of each of the first and second hot water mixing valves, and a first hot water supply at each of the first and second hot water supply destinations. A storage unit storing information indicating a relationship between an opening degree of the hot water mixing valve and a temperature detected by a temperature sensor disposed downstream of the first hot water mixing valve, and the control unit is a first hot water supply destination. When hot water supply is started at the second hot water supply destination while hot water is being supplied, the detection result of the tank hot water temperature sensor, the detection result of the water temperature sensor, and the first hot water mixing valve are arranged downstream. The flow rate sensor detection result and the first feed specified by the operation unit Using the previous hot water supply temperature, the opening degree of the second hot water / water mixing valve corresponding to the hot water supply temperature at the second hot water supply designated by the operation unit, and the above-mentioned information stored in the storage unit The correction value of the opening degree of the first hot water / water mixing valve is obtained so that the fluctuation of the hot water temperature at the first hot water supply destination is suppressed, and the first hot water / water mixing valve is controlled based on the correction value. It is what.

  In the hot water storage type hot water supply apparatus of the present invention, when hot water supply is started at the second hot water supply destination while hot water supply is being performed at the first hot water supply destination, as described above, the detection result of the tank hot water temperature sensor The detection result of the water temperature sensor, the detection result of the flow sensor arranged downstream of the first hot water mixing valve, the hot water supply temperature at the first hot water supply point designated by the operation unit, and the second hot water mixing A correction value for the opening degree of the first hot and cold water mixing valve is obtained using the opening degree of the valve and predetermined information stored in the storage unit. Since the correction value of the opening degree of the first hot water / water mixing valve is determined in consideration of the hot water supply amount at the first hot water supply destination and the opening degree of the second hot water / water mixing valve, respectively, for example, hot water storage described in Patent Document 1 Compared to the case where the first hot water mixing valve is controlled without considering the amount of hot water supplied at the first hot water supply as in the case of the hot water supply apparatus, the hot water supply at the first hot water supply that has started the hot water supply earlier Easy to suppress temperature fluctuations.

  Hereinafter, embodiments of a hot water storage type hot water supply apparatus of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

  FIG. 1 is a schematic diagram illustrating an example of a hot water storage type hot water supply apparatus. The hot water storage type hot water supply apparatus 20 shown in the figure includes a heat source unit A in which a heat source device (not shown) such as a heat pump that heats water to make hot water, and a hot water storage tank in which hot water obtained by the heat source device is stored. And a hot water storage unit B in which 1 and the like are accommodated.

  In the hot water storage unit B, a water supply line 3 having one end connected to a water source such as a water supply is disposed, and the water supply line 3 is branched into two sub-water supply lines 3a and 3b on the way. ing. A pressure reducing valve 4 is provided upstream of the branch point of the auxiliary water supply pipes 3a and 3b to adjust the pressure of water flowing into the auxiliary water supply pipes 3a and 3b. One sub-water supply line 3a has one end connected to the lower part of the hot water storage tank 1, and the other sub-water supply line 3b is further branched into two sub-water supply lines 3c and 3d. After the hot water storage type hot water supply device 20 is installed, water is injected into the hot water storage tank 1 through the auxiliary water supply line 3a until the hot water storage tank 1 becomes full. In addition, after the hot water storage type hot water supply device 20 is operated, the same amount of water as the consumed hot water is supplied to the hot water storage tank 1 through the auxiliary water supply pipe 3a, and the hot water storage tank 1 is always kept in a full state. It is.

  Connected to the hot water storage tank 1 is a heating circulation line 5 that extends from the lower part of the hot water storage tank 1 to the upper part of the hot water storage tank 1 through a heat source device. The water in the hot water storage tank 1 flows into the heating circulation line 5 from the lower part of the hot water storage tank 1, is heated by a heat source machine to become hot water, and then supplied from the upper part of the hot water storage tank 1 into the hot water storage tank 1. When the hot water storage type hot water supply device 20 is in operation, water stays in the lower part of the hot water storage tank 1 and hot water stays in the upper part.

  In order to supply hot water in the hot water storage tank 1 to a desired hot water supply destination, one end of a hot water supply pipe 7 is connected to the upper part of the hot water storage tank 1. This hot water supply pipe 7 is branched into two auxiliary hot water supply pipes 7a and 7b, and a relief valve 8 for draining the expanded water generated by boiling the hot water out of the hot water storage unit B before the branch point. Is provided.

  Of the two auxiliary hot water supply pipes 7a and 7b, the auxiliary hot water supply pipe 7a is connected to a first hot water supply destination (not shown), for example, a sink faucet, and a first hot water / water mixing valve in the middle thereof. 9a and the flow sensor 11a are arranged in this order from the upstream side. The auxiliary hot water supply line 7b is connected to a second hot water supply destination (not shown), for example, a hot water tap for a bathtub, and a second hot water / water mixing valve 9b, an electromagnetic valve 10, and a flow rate sensor 11b are provided in the middle. Are arranged in this order from the upstream side. One end of a sub-water supply line 3c is connected to the first hot water / mixing valve 9a, and one end of a sub-water supply line 3d is connected to the second hot water / water mixing valve 9b. Each of the hot and cold water mixing valves 9a and 9b is an electric type configured so that the liquid can flow even at the minimum opening. Moreover, each arrow in FIG. 1 has shown the flow direction of water or hot water.

  In order to control the hot water supply temperature at each hot water supply destination to a predetermined temperature, the operation of the heat source unit, the first hot water mixing valve 9a, the second hot water mixing valve 9b, and the solenoid valve 10 is performed in the hot water storage unit B. A control unit 15 to be controlled and a storage unit 17 in which information used for control by the control unit 15 is stored are arranged. Further, outside the hot water storage unit B, it is connected to the control unit 15 and functions as an information input device for designating the control contents of the opening degrees of the first and second hot water mixing valves 9a, 9b by the control unit 15. An operation unit 19 is disposed. The operation unit 19 is connected to the control unit 15 by wire or wirelessly and transmits information input by the user to the control unit 15. Although only one operation unit 19 is shown in FIG. 1, a desired number of operation units 19 can be arranged in each of the first and second hot water supply destinations.

  FIG. 2 is a block diagram schematically showing the relationship between the control unit 15 and the constituent members involved in the control by the control unit 15. As shown in the figure, the control unit 15 includes information stored in the storage unit 17, control contents transmitted from the operation unit 19, flow rate sensors 11a and 11b, a water temperature sensor 13a, and a tank hot water temperature sensor 13b. And the detection results collected from the temperature sensors 13c and 13d are used to control the operation of the heat source unit A, the first hot / cold water mixing valve 9a, the second hot / cold water mixing valve 9b, and the electromagnetic valve 10.

  The above information includes information about the boiling temperature of hot water at the heat source machine and information about the hot water supply temperature at each of the first and second hot water supply destinations. By designating each of the above temperatures, the temperature is stored in the storage unit 17 via the control unit 15. Moreover, the upper limit of the starting opening degree of the 1st or 2nd hot water mixing valve 9a, 9b at the time of starting hot water supply in the other side while hot water supply is performed in either of the 1st and 2nd hot water supply destinations About the opening degree of the first hot water mixing valve 9a when the hot water is being supplied at the first and second hot water supply destinations and the temperature sensor 13c disposed downstream of the first hot water mixing valve 9a. Information indicating the relationship with the detected temperature is also stored in the storage unit 17. These pieces of information are stored in advance in the storage unit 17 by, for example, the manufacturer of the hot water storage type hot water supply apparatus 20.

  For example, when the user designates the boiling temperature of hot water using the operation unit 19, information about the temperature is stored in the storage unit 17. The control unit 15 periodically collects the detection result of the water temperature sensor 13a and the detection result of the tank hot water temperature sensor 13b, and uses the detection result and the information about the boiling temperature to give a predetermined value to the heat source unit A. Give instructions to boil.

  In addition, when the user designates the hot water supply temperatures at the first hot water supply destination and the second hot water supply destination through the operation unit 19, information about the hot water supply temperature is stored in the storage unit 17. When the controller 15 periodically collects the detection results of the flow sensors 11a and 11b and determines from the detection results that hot water is being supplied at the first hot water supply destination or the second hot water supply destination, The detection results of the sensor 13c or the temperature sensor 13d are collected periodically. Based on the detection results of the water temperature sensor 13a and the tank hot water temperature sensor 13b so that the detection results of the temperature sensors 13c and 13d corresponding to the hot water supply destination where the hot water is being supplied become the set temperature of the user. The opening degree of the hot / cold water mixing valve 9a or the second hot / cold water mixing valve 9b is controlled. When hot water supply at the second hot water supply destination is instructed by the user using the operation unit 19, the solenoid valve 10 is opened after controlling the opening degree of the second hot water mixing valve 9b as described above.

  The control part 15 can perform separately the operation control of the 1st hot water mixing valve 9a, and the operation control of the 2nd hot water mixing valve 9b. Hot water supply that has already started hot water supply even when simultaneous hot water supply occurs such that hot water supply is started on the other side while hot water supply is being performed on either the first hot water supply destination or the second hot water supply destination The opening degree of the first hot water / water mixing valve 9a or the second hot water / water mixing valve 9b is controlled so that the previous hot water temperature does not deviate from the temperature set by the user. Hereinafter, a method for controlling the hot water temperature at each hot water supply destination by the control unit 15 will be described in detail with reference to FIG. 3 with appropriate reference numerals used in FIG.

  FIG. 3 is a flowchart schematically showing a method of controlling the hot water supply temperature at each hot water supply destination by the control unit 15 shown in FIG. As shown in the figure, the control of the hot water supply temperature at each hot water supply destination by the control unit 15 can be divided into steps S1 to S19.

  In step S1, the control unit 15 determines whether or not hot water is being supplied at the first hot water supply destination based on the detection result of the flow rate sensor 11a (see FIG. 1) arranged downstream of the first hot water / mixing valve 9a. to decide. When it is determined that hot water is being supplied at the first hot water supply destination, the process proceeds to step S2, and single hot water supply control is performed on the first hot water supply destination, that is, hot water supply control is performed when there is only one hot water supply destination.

  Next, the control unit 15 proceeds to step S3 while continuing the single hot water supply control, and the control unit 15 determines whether the user has instructed the start of hot water supply at the second hot water supply destination using the operation unit 19 (see FIG. 1). . When it is determined that the start of hot water supply at the second hot water supply destination is not instructed, the process proceeds to step S4, and whether or not the hot water supply at the first hot water supply destination is continued based on the detection result of the flow sensor 11a. The control unit 15 determines. When it is determined in step S4 that the hot water supply at the first hot water supply destination is continued, the process returns to step S2, and when it is determined that the hot water supply is not continued, the process returns, that is, returns to step S1.

  When it is determined in step S3 that the start of hot water supply at the second hot water supply destination is instructed, the process proceeds to step S5, and the first hot water mixing valve 9a is used to suppress fluctuations in the hot water supply temperature at the first hot water supply destination. The opening degree (see FIG. 1) is corrected. During this time, hot water supply is started at the second hot water supply destination. The correction of the opening degree in step S5 is a characteristic part of control by the control unit 15, and will be described in detail later with reference to FIG.

  Next, in step S6, the control unit 15 determines whether or not hot water supply at the first hot water supply destination is continued based on the detection result of the flow sensor 11a (see FIG. 1). When it is determined that the hot water supply at the first hot water supply destination is not continued, the process proceeds to step S12 described later, and when it is determined that the hot water supply is continued, the process proceeds to step S7.

  In step S7, simultaneous hot water supply control, that is, hot water supply control when there are a plurality of hot water supply destinations, is performed on the first hot water / water mixing valve 9a (see FIG. 1). The correction of the opening degree performed on the first hot water / water mixing valve 9a in step S5 is canceled after a predetermined time has elapsed from the start of the simultaneous hot water supply control.

  Thereafter, the process proceeds to step S8 while continuing the simultaneous hot water supply control, and the second hot water supply destination is based on the detection result of the flow rate sensor 11b (see FIG. 1) disposed downstream of the second hot water / mixing valve 9b. The control unit 15 determines whether the hot water supply is continued. When it is determined that the hot water supply is not continued at the second hot water supply destination, the process returns to step S2. When it is determined that the hot water supply is continued, the process proceeds to step S9, and the second hot water / mixing valve 9b (see FIG. 1) is operated. After the simultaneous hot water supply control is started, the process returns to step S6.

  On the other hand, when it is determined in step S1 that the hot water supply at the first hot water supply destination is not performed, the process proceeds to step S11, and the user uses the operation unit 19 (see FIG. 1) to perform the operation at the second hot water supply destination. Control unit 15 determines whether or not the start of hot water supply has been instructed. When it is determined that the start of hot water supply at the second hot water supply destination is not instructed, the process returns to step S1, or when it is determined that the start of hot water supply at the second hot water supply destination is instructed, step S12. Then, the single hot water supply control for the second hot water supply destination, that is, the hot water supply control when there is only one hot water supply destination is performed.

  Next, the process proceeds to step S13 while the single hot water supply control is continued, and hot water supply is started at the first hot water supply destination based on the detection result of the flow sensor 11a (see FIG. 1) arranged downstream of the first hot water / mixing valve 9a. The control unit 15 determines whether or not it has been done. When it is determined that the hot water supply is not started at the first hot water supply destination, the control unit 15 proceeds to step S14 to determine whether the hot water supply at the second hot water supply destination is continued based on the detection result of the flow sensor 11b. Judgment. When it is determined in step S14 that hot water supply at the second hot water supply destination is continued, the process returns to step S12, and when it is determined that hot water supply is not continued, the process returns, that is, returns to step S1.

  When it is determined in step S13 that the hot water supply is started at the first hot water supply destination, the process proceeds to step S15, and the second hot water / water mixing valve 9b (FIG. 1) is used to suppress fluctuations in the hot water supply temperature at the second hot water supply destination. Correct the opening. This correction is a characteristic part of the control by the control unit 15, and will be described in detail later with reference to FIG.

  After performing the above correction, the process proceeds to step S16, and the control unit 15 determines whether hot water supply at the second hot water supply destination is continued based on the detection result of the flow sensor 11b (see FIG. 1). When it is determined that the hot water supply at the second hot water supply destination is not continued, the process returns to step S12 described above, and when it is determined that the hot water supply is continued, the process proceeds to step S17.

  In step S17, simultaneous hot water supply control, that is, hot water supply control when there are a plurality of hot water supply destinations, is performed on the second hot water / water mixing valve 9b (see FIG. 1) arranged downstream of the second hot water / water mixing valve 9b. . The correction of the opening degree performed on the second hot water / water mixing valve 9b in step S15 is canceled after a predetermined time has elapsed from the start of the simultaneous hot water supply control.

  Thereafter, the process proceeds to step S18 while the above-described simultaneous hot water supply control is continued, and at the first hot water supply destination based on the detection result of the flow rate sensor 11a (see FIG. 1) arranged downstream of the first hot water / mixing valve 9a. The control unit 15 determines whether the hot water supply is continued. When it is determined that the hot water supply is not continued at the first hot water supply destination, the process returns to step S12. When it is determined that the hot water supply is continued, the process proceeds to step S19, and the first hot water / water mixing valve 9a (see FIG. 1) is entered. On the other hand, after the simultaneous hot water supply control is started, the process returns to step S16.

  In this way, the hot water storage type hot water supply apparatus 20 (see FIG. 1) in which the control unit 15 controls the hot water supply temperature at each hot water supply destination is the first or second hot water mixing valve 9a, 9b in the above-described steps S5, S15. Steps S5 and S15 will be described in detail below with reference to FIG. 4 or FIG. 5 with appropriate reference to the reference numerals used in FIG.

  FIG. 4 is a flowchart showing an example of the process in step S5 described above. In the illustrated example, step S5 is divided into four sub-steps S5a to S5d. In sub-step S5a, using the detection result of the water temperature sensor 13a, the detection result of the tank hot water temperature sensor 13b, and the hot water supply temperature at the second hot water supply point designated by the user through the operation unit 19 (see FIG. 1), The control part 15 calculates the starting opening degree of the 2nd hot-water / water mixing valve 9b (refer FIG. 1). In sub-step S5b, the control unit 15 compares the calculation result of the start opening and the upper limit value stored in the storage unit 17 (see FIG. 1) to determine the start opening of the second hot water / mixing valve 9b. Then, after the opening degree of the second hot water / water mixing valve 9b is set to the start opening degree, the electromagnetic valve 10 is opened. As a result, hot water supply at the second hot water supply destination is started.

  The upper limit value is the first or second hot water mixing valve 9a, 9b when hot water supply is started on the other side while hot water supply is being performed on one of the first and second hot water supply destinations. Means the upper limit of the starting opening. The upper limit value may be the maximum structural opening degree of each of the hot and cold water mixing valves 9a and 9b, or may be another value. When this upper limit value is set to a value different from the structural maximum opening of the individual hot water mixing valves 9a and 9b, the upper limit value may be set to a value that can easily suppress fluctuations in the hot water supply temperature at the first hot water supply destination. preferable.

  In sub-step S5c, the detection result of the water temperature sensor 13a, the detection result of the tank hot water temperature sensor 13b, the detection result of the flow rate sensor 11a (see FIG. 1) arranged downstream of the first hot water / water mixing valve 9a, and the operation Using the hot water supply temperature at the first hot water supply point designated by the user by the unit 19 and the opening degree of the second hot water / water mixing valve 9b, the control unit 15 uses the first hot water / water mixing valve 9a (see FIG. 1). ) Is calculated. A method for calculating the correction amount will be described in detail later with reference to FIGS.

  In sub-step S5d, the control unit 15 obtains a correction value for the opening degree of the first hot water / water mixing valve 9a based on the correction amount, and controls the operation of the first hot water / water mixing valve 9a based on the correction value. Try again. That is, a value obtained by adding the correction amount to the current opening is obtained as a correction value, and the operation of the first hot water / water mixing valve 9a is controlled again based on the correction value. Thereby, it is suppressed that the hot-water supply temperature in the 1st hot-water supply destination which supplies hot water before the 2nd hot-water supply destination changes with the start of the hot-water supply in a 2nd hot-water supply destination.

  FIG. 5 is a flowchart showing an example of the process in step S15 described above. In the illustrated example, step S15 is divided into four sub-steps S15a to S15d. In sub-step S15a, using the detection result of the water temperature sensor 13a, the detection result of the tank hot water temperature sensor 13b, and the hot water supply temperature at the first hot water supply point designated by the user through the operation unit 19 (see FIG. 1), The control part 15 calculates the starting opening degree of the 1st hot water mixing valve 9a (refer FIG. 1). In sub-step S15b, the control unit 15 compares the calculation result of the start opening and the upper limit value stored in the storage unit 17 (see FIG. 1) to determine the start opening of the first hot water / mixing valve 9a. Then, the opening degree of the first hot water / water mixing valve 9a is set to the starting opening degree. As a result, hot water supply at the first hot water supply destination is started.

  Note that the upper limit value means the upper limit value described in the description of the sub-step S5b shown in FIG. When the upper limit value is set to a value different from the structural maximum opening degree of the individual hot water / water mixing valves 9a and 9b, the upper limit value may be set to a value that can easily suppress fluctuations in the hot water temperature at the second hot water supply destination. preferable.

  In sub-step S15c, the detection result of the water temperature sensor 13a, the detection result of the tank hot water temperature sensor 13b, the detection result of the flow rate sensor 11b (see FIG. 1) arranged downstream of the second hot water / water mixing valve 9b, and the user The controller 15 uses the hot water supply temperature at the second hot water supply point designated by the operation unit 19 and the opening degree of the first hot water / water mixing valve 9a to control the second hot water / water mixing valve 9b (see FIG. 1). ) Is calculated. A method for calculating the correction amount will be described in detail later with reference to FIGS.

  In sub-step S15d, the control unit 15 obtains a correction value for the opening degree of the second hot water / mixing valve 9b based on the correction amount, and controls the operation of the second hot water / mixing valve 9b based on the correction value. Try again. That is, a value obtained by adding the above correction amount to the current opening is obtained as a correction value, and the operation of the second hot water / mixing valve 9b is controlled again based on the correction value. Thereby, it is suppressed that the hot-water supply temperature in the 2nd hot-water supply destination which supplies hot water before the 1st hot-water supply destination changes with the start of the hot-water supply in the 1st hot-water supply destination.

  Hereinafter, the correction amount calculation method in step S5c (see FIG. 4) and step S15c described above will be described in detail with reference to FIGS.

  6 shows the opening degree of the first hot water / water mixing valve 9a when the single hot water is supplied to the first hot water supply destination and the temperature sensor 13c arranged downstream of the first hot water / water mixing valve 9a (see FIG. 1). It is a graph which shows an example of the relationship with the detected temperature. Moreover, FIG. 7 is arrange | positioned downstream of the opening degree of the 1st hot water mixing valve 9a when performing simultaneous hot water supply to the 1st hot water supply destination and the 2nd hot water supply destination, and the 1st hot water mixing valve 9a. It is a graph which shows an example of the relationship with the detected temperature of the temperature sensor 13c. The first hot and cold water mixing valve 9a shown in these drawings can control its opening in steps from 0 (zero) step to 1000 steps (the same applies hereinafter).

As is clear from FIG. 6, when the opening degree of the first hot water / water mixing valve 9a is set to 0 step, the water side is fully opened, and the detected temperature of the temperature sensor 13c is equal to the detected temperature of the water temperature sensor 13a (see FIG. 1). Almost equal. When slide into increasing the degree of opening of the first hot and cold water mixing valve 9a when alone hot water in the first hot water destination, the temperature detected by the temperature sensor 13c as shown by the line L ₁ in the figure rises substantially linearly When the opening degree of the first hot water / mixing valve 9a reaches the upper limit of 1000 steps, the detected temperature of the temperature sensor 13c becomes substantially equal to the detected temperature of the tank hot water temperature sensor 13b (see FIG. 1).

  On the other hand, when performing simultaneous hot water supply to the first hot water supply destination and the second hot water supply destination, even if the opening degree of the first hot water mixing valve 9a is made constant, the hot water supply temperature at the first hot water supply destination is The temperature may vary depending on the hot water supply temperature at the second hot water supply destination. In other words, the temperature detected by the temperature sensor 13c may vary depending on the degree of opening of the second hot and cold water mixing valve 9b (see FIG. 1).

That is, when the hot-water supply temperature at the second hot-water supply destination is low, the opening degree of the second hot-water mixing valve 9b decreases, and the amount of water supplied to the second hot-water mixing valve 9b increases. The amount of water supplied to the mixing valve 9a may decrease. As a result, as shown by curves L _{11 to} L ₁₃ in FIG. 7, even when the opening degree of the first hot water / water mixing valve 9a is the same as the opening degree at the time of single hot water supply, The hot water supply temperature may be temporarily higher than the temperature set by the user. On the other hand, when the hot-water supply temperature at the second hot-water supply destination is high, the opening degree of the second hot-water mixing valve 9b increases, and the amount of hot water supplied to the second hot-water mixing valve 9b increases. The amount of hot water supplied to the mixing valve 9a may decrease. As a result, as shown by curves L _{15 to} L ₁₇ in FIG. 7, even if the opening degree of the first hot water / mixing valve 9a is the same as the opening degree at the time of the single hot water supply, The hot water supply temperature may be temporarily lower than the user set temperature.

  The control unit 15 opens the first hot water / water mixing valve 9a when the single hot water is supplied to the first hot water supply destination, and the detected temperature of the temperature sensor 13c disposed downstream of the first hot water / water mixing valve 9a. The value of the slope in the graph of the function representing the relationship between the first hot water supply destination and the second hot water supply destination, and the opening degree of the first hot water mixing valve 9a and the temperature sensor 13c Using the slope values at each of the plurality of approximate lines in the graph of the function representing the relationship with the detected temperature, the correction amount of the opening degree of the first hot water / mixing valve 9a is obtained in the aforementioned sub-steps S5c and S15c. .

  Therefore, in the memory | storage part 17, when the hot water supply is performed in the 1st and 2nd hot-water supply destination, respectively, the opening degree of the 1st hot water mixing valve 9a and the 1st hot water mixing valve 9a are arrange | positioned downstream. As information indicating the relationship with the temperature detected by the temperature sensor 13c, information on the value of the slope at each of the plurality of approximate lines is stored. Instead of the information, information on a plurality of curves indicating the relationship between the opening degree and the detected temperature, information on how to obtain the plurality of approximate lines, and how to obtain the inclination at each of the plurality of approximate lines Can be stored in the storage unit 17, and information on the plurality of approximate lines and information on how to obtain the inclinations of the plurality of approximate lines are stored in the storage unit 17. You can also.

  In addition, about the value of the slope in the graph of the function when performing the above-mentioned individual hot water supply, the control content of the opening degree of the first hot water mixing valve 9a by the control unit 15 is a predetermined value, and the value is a constant, For example, the hot water storage type hot water supply apparatus 20 (see FIG. 1) may be configured to be “1”, the detected temperature of the water temperature sensor 13a, the detected temperature of the tank hot water temperature sensor 13b, and the first hot water / water mixing valve 9a. The control unit 15 may obtain by calculation using information on the range of the controllable opening at.

For example, the curves L _{11 to} L ₁₃ and L _{15 to} L ₁₇ shown in FIG. 7 can be approximated by four approximate lines L _{21 to} L ₂₄ as shown in FIG. Here, the approximate line _{L 21} and the approximate line _{L 23} and the approximate line _{L 22} and the approximate line _{L 24} represents the same approximate line when the detected temperature of the temperature sensor 13c is in the opposite relationship with respect to the line _{L 1} ing. Incidentally, the line segment L ₁ shown by the one-dot chain line in FIG. 8 is identical to the line segment L ₁ shown in FIG. Further, a line segment L ₃₀ indicated by a one-dot chain line in FIG. 8 is in a line symmetrical relationship with the line segment L _1, and the line segment L ₃₀ is a contact point P ₁ between the approximate line L ₂₁ and the approximate line L ₂₂ , and It passes through the contact point _{P 2} between the approximate line _{L 23} and the approximate line _{L 24.} "Tc" in FIG. 8 represents the temperature detected by the temperature sensor 13c in contact P ₁ (see FIG. 1).

The opening degree of the first hot and cold water mixing valve 9a when simultaneous hot water supply is being performed and the detected temperature of the temperature sensor 13c (see FIG. 1) disposed downstream of the first hot and cold water mixing valve 9a are approximated as shown in FIG. when approximated by a line L _21, the control unit 15, the number of steps of correction S _a, for example, the following formula is a correction amount for the opening degree of the first hot and cold water mixing valve 9a (i)
_{S A = [1000 / (T} H -T W)] · [(T K -T W) / D 1] -S 0 ... (i)
Calculate based on In Formula (i), “T _W ” represents the detected temperature of the water temperature sensor 13 a, “T _H ” represents the detected temperature of the tank hot water temperature sensor 13 b, and “T _K ” is the first specified by the user. This shows the hot water supply temperature at the hot water supply destination. “D ₁ ” represents the slope of the approximate line L _{21 in} consideration of the hot water supply amount at the first hot water supply destination, and “S ₀ ” represents the current opening degree of the first hot water mixing valve 9 a. ing.

Said slope D ₁ is the inclination alpha ₀ of the line segment L ₁ shown in FIG. 6, the inclination alpha ₁ of the approximate line L ₂₁ that is not in consideration of the hot water supply amount of the first hot-water supply destination, the first sub Using the flow coefficient E determined according to the pipe diameter of the hot water supply pipe line 7a, the following formula (ii)
D ₁ = E (α ₁ −α ₀ ) + α ₀ (ii)
It can ask for.

Here, the inclination alpha ₁ includes a start opening S _F of the second hot and cold water mixing valve 9b, the MAX opening of the structure of the second hot and cold water mixing valve 9b (the maximum opening here as "1000" The same shall apply hereinafter) and the following formula (iii)
α ₁ = cos (π · S _F / 1000) + β (iii)
It can ask for.

In addition, the flow coefficient E is calculated by using the flow rate G _K (unit: liters / minute) detected by a flow sensor 11a (see FIG. 1) disposed downstream of the first hot water / water mixing valve 9a using the following formula (iv )
E = (G _K −n) ² / m + 1 (iv)
It can ask for. “N” and “m” in the formula (iv) are constants determined according to the pipe diameter or the like in the hot water supply pipe 7 (see FIG. 1), respectively. When the flow rate _GK is n or more, the flow coefficient E is 1.

Note that “β” in the above formula (iii) is a variable whose value changes according to the maximum opening degree allowed when the second hot water / water mixing valve 9b is started. The maximum opening allowed when the second hot water / mixing valve 9b is started can be the maximum structural opening of the second hot / water mixing valve 9b, that is, 1000 steps, or other values. it can. When starting the hot water in the second water heating destination in the middle of performing a hot-water supply in the first hot water destination, the value of "β" is the allowable to be the same value as the above inclination alpha ₀ If the maximum opening is set, it becomes easy to suppress fluctuations in the hot water supply temperature at the first hot water supply destination.

Figure 9 is a graph showing an example of the relationship of the above-described inclination alpha ₁ and the opening of the second hot and cold water mixing valve 9b. As shown in the figure, the inclination alpha ₁ is larger when the degree of opening of the second hot and cold water mixing valve 9b during simultaneous hot-water supply is reduced, smaller and the opening of the second hot and cold water mixing valve 9b is increased conversely. In the example shown in the figure, the maximum opening allowed when the second hot and cold water mixing valve 9b is started is set to 500 steps, and the slope α _{1 at} this time is the slope α _{0 of} the line segment L ₁ shown in FIG. Β is set to be “1” which is the same value as. That is, the value of β is set to “1”.

  FIG. 10 is a graph showing an example of the relationship between the flow coefficient E and the flow rate detected by the flow sensor 11a (see FIG. 1). The example shown in the figure shows the relationship between the flow rate coefficient E and the flow rate when “n” in equation (iv) is “15” and “m” is “50”.

On the other hand, the opening degree of the first hot water / mixing valve 9a and the detected temperature of the temperature sensor 13c (see FIG. 1) arranged downstream of the first hot water / water mixing valve 9a when simultaneous hot water supply is performed are shown in FIG. when approximated by approximation line L ₂₂ showing the control unit 15, the number of steps of correction S _B, for example the following formula is a correction amount for the opening degree of the first hot and cold water mixing valve 9a (v)
S _B = [1000 / (T _H −T _W )] · D ₂ · (T _K −T _W ) + 1000−S ₀ (v)
Calculate based on In the equation (v), “T _W ” represents the temperature detected by the water temperature sensor 13 a, “T _H ” represents the temperature detected by the tank hot water temperature sensor 13 b, and “T _K ” is the first specified by the user. This shows the hot water supply temperature at the hot water supply destination. “S ₀ ” represents the current opening degree of the first hot water / mixture valve.

Here, “D ₂ ” in the above formula (v) represents the slope of the approximate line L ₂₂ that also takes into account the amount of hot water at the first hot water supply destination, and the slope D ₂ is shown in FIG. In accordance with the inclination α ₀ of the line segment L ₁ , the inclination α ₂ of the line segment L ₂₃ not taking into account the amount of hot water supply at the first hot water supply destination, the pipe diameter of the first auxiliary hot water supply line 7a, etc. Using the determined flow coefficient E, the following formula (iv)
D ₂ = E (α ₂ −α ₀ ) + α ₀ (iv)
It can ask for.

The inclination α ₂ is such that Tc shown in FIG.
Tc = (D ₂ × T _H + T _W ) / (1 + D ₂ ) (iiv)
From in a can be expressed, it the temperature detected by the temperature sensor 13c when the opening degree of the first hot and cold water mixing valve 9a is 1000 steps are detected temperature T _H of the tank hot water temperature sensor can be calculated . Note that the slope D ₁ indicates the slope of the approximate line L ₂₁ , and the approximate line L ₂₃ is an approximate line of the curves L _{15 to} L ₁₇ when the opening degree of the second hot and cold water mixing valve 9 b increases. since the slope D ₁ is changed by the opening of the second hot and cold water mixing valve 9b, 8, which are drawn two examples, the number of steps of correction S _a of the approximate line L ₂₁ and the approximate line L ₂₃ is It is obtained with the same arithmetic expression. Similarly, the number of correction steps S _B of the approximate line L ₂₂ and the approximate line L ₂₄ can be obtained by the same arithmetic expression.

As is apparent from the above description made with reference to FIGS. 6 to 10, the correction amount is calculated in the sub-step S5c shown in FIG. 4 based on the detection result (detected temperature T _W ) of the water temperature sensor 13a, the tank hot water temperature sensor 13b of the detection result (detected temperature T _H), the detection result of the flow rate sensor 11a disposed downstream of the first hot and cold water mixing valve 9a (detection rate), the first hot water destination specified by the operation unit 19 hot water supply temperature T _K and, second and start opening the second hot and cold water mixing valve 9b corresponding to the hot water supply temperature at the hot water destination, the aforementioned information stored in the storage unit 17 which is designated by the operation unit 19 in Can be used.

The calculation of the correction amount in sub-step S5c shown in FIG. 4 is based on the detection result (detected temperature T _W ) of the water temperature sensor 13a, the tank hot water temperature sensor 13b, under the same idea as the calculation of the correction amount described above. Detection result (detection temperature T _H ), detection result (detection flow rate) of the flow rate sensor 11b disposed downstream of the second hot water / water mixing valve 9b, hot water supply temperature at the second hot water supply destination designated by the operation unit 19 And the opening degree of the first hot water / water mixing valve 9a corresponding to the hot water supply temperature at the first hot water supply designated by the operation unit 19 and the information stored in the storage unit 17 can be used. .

  In this case, the storage unit 17 is disposed downstream of the opening degree of the second hot water / water mixing valve 9b and the second hot water / water mixing valve 9b when hot water is supplied at the first and second hot water supply destinations, respectively. As information indicating the relationship with the temperature detected by the temperature sensor 13d, information on the value of the slope at each of a plurality of approximate lines corresponding to the plurality of approximate lines shown in FIG. 8 is stored. Instead of the information, information on a plurality of curves indicating the relationship between the opening and the detected temperature, information on how to obtain a plurality of approximate lines corresponding to the plurality of approximate lines shown in FIG. Information about how to obtain the slopes for each of the plurality of approximate lines can be stored in the storage unit 17, information about the approximate lines corresponding to the plurality of approximate lines shown in FIG. 8, and the plurality of approximations. Information about how to determine the inclination of each line can also be stored in the storage unit 17.

  As described above, in the hot water storage type hot water supply apparatus 20 (see FIG. 1), the control unit 15 takes the first hot water supply amount at the first hot water supply destination and the starting opening degree of the second hot water mixing valve 9b into consideration. Since the correction value of the opening degree of the hot water mixing valve 9a is obtained, the first hot water mixing valve is used without considering the hot water supply amount at the first hot water supply destination as in the hot water storage type hot water supply apparatus described in Patent Document 1, for example. Compared to the case of controlling, it is easy to suppress fluctuations in the hot water supply temperature at the first hot water supply destination that has been started. Similarly, the control unit 15 obtains a correction value for the opening degree of the second hot water mixing valve 9b in consideration of the amount of hot water supplied at the second hot water supply destination and the opening degree of the first hot water mixing valve 9a. It is easy to suppress fluctuations in the hot water supply temperature at the second hot water supply destination that has already started hot water supply.

  As mentioned above, although the hot water storage type hot water supply apparatus of the present invention has been described with reference to the embodiment, the present invention is not limited to the above-described form as described above. For example, the hot water storage type hot water supply apparatus 20 described above is of a type that includes the heat source unit A outside the hot water storage unit B, but the hot water storage type hot water supply apparatus of the present invention is another type that can simultaneously supply hot water to a plurality of locations. For example, a type having a heat source device such as a heater in the hot water storage tank 1 (see FIG. 1).

  In addition, when hot water supply is started at another hot water supply destination while hot water supply is being performed at a certain hot water supply destination, correction for the opening degree of the hot water mixing valve must be performed for all of the hot water supply locations. Instead, the hot water storage type hot water supply apparatus of the present invention only needs to be configured to be performed in at least one place. For example, for a hot and cold water mixing valve corresponding to a hot water supply destination that has a high chance of being directly discharged to the human body, such as a sink faucet, the opening degree is corrected as described above, and used for hot water filling or hot water in a bathtub. The hot water storage hot water supply apparatus of the present invention can be configured so as not to correct the opening degree of a hot water / water mixing valve corresponding to a hot water supply destination that has a low chance of being directly discharged to the human body, such as a hot water tap.

  The correction for the opening degree of the hot water mixing valve takes into account the amount of hot water supplied at the hot water supply destination where the hot water supply was started earlier and the opening degree of the hot water mixing valve corresponding to the hot water destination where hot water supply is started later, Any method other than the method described in the embodiment may be used as long as it corrects the opening degree of the hot water / water mixing valve corresponding to the hot water supply destination that has started the hot water supply.

For example, the following formula (iiiv) or the following formula (ix) can be obtained without obtaining a correction amount for the opening degree of the hot water mixing valve corresponding to the hot water supply destination that has started the hot water supply earlier.
_{S C = [1000 / (T} H -T W)] · [(T K -T W) / D 1] ... (iiiv)
S _D = [1000 / (T _H −T _W )] · D ₂ · (T _K −T _W ) +1000 (ix)
Thus, the correction value of the opening degree can be directly obtained.

Opening after correction represented by the above formula (IIIV) is the sum of the current opening degree S ₀ of the number of steps of correction S _A of the first hot and cold water mixing valve 9a of the formula described above (i) It corresponds to the opening degree of the corrected represented by the above formula (ix), the current opening degree S of the number of steps of correction S _B of the first hot and cold water mixing valve 9a of the formula described above (v) Corresponds to the sum of _zero . The hot water storage type hot water supply apparatus of the present invention can be variously modified, modified and combined in addition to the above.

It is the schematic which shows an example of the hot water storage type hot-water supply apparatus of this invention. It is a block diagram which shows roughly the relationship between the control part which comprises the hot water storage type hot-water supply apparatus shown in FIG. 1, and the structural member which concerns on control by this control part. It is a flowchart which shows roughly the control method of the hot water supply temperature in each hot-water supply destination by the control part which comprises the hot water storage type hot-water supply apparatus shown in FIG. It is a flowchart which shows an example of the process in step S5 shown in FIG. It is a flowchart which shows an example of the process in step S15 shown in FIG. The opening degree of the first hot water mixing valve and the detection of the temperature sensor disposed downstream of the first hot water mixing valve when the single hot water supply is performed from the hot water storage type hot water supply apparatus shown in FIG. It is a graph which shows an example of the relationship with temperature. The opening of the first hot water mixing valve and the downstream of the first hot water mixing valve when simultaneous hot water is supplied to the first hot water supply destination and the second hot water supply destination from the hot water storage type hot water supply apparatus shown in FIG. It is a graph which shows an example of the relationship with the detection temperature of the arrange | positioned temperature sensor. 8 is a graph showing four approximate lines for each curve shown in FIG. 7. It is a graph which shows an example of the relationship between the inclination which does not consider the hot water supply amount in the 1st hot water supply destination about one of the approximate lines shown in FIG. 8, and the opening degree of a 2nd hot water mixing valve. It is a graph which shows an example of the relationship between the flow rate coefficient in the hot water storage type hot-water supply apparatus shown in FIG. 1, and the flow volume detected by the flow sensor arrange | positioned downstream of the 1st hot water mixing valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 3 Water supply line 3a-3d Sub water supply line 5 Heating circulation line 7 Hot water supply line 7a, 7b Sub hot water supply line 9a 1st hot water mixing valve 9b 2nd hot water mixing valve 11a, 11b Flow rate sensor 13a Water temperature sensor 13b Tank temperature sensor 13c, 13d Temperature sensor 15 Control unit 17 Storage unit 19 Operation unit 20 Hot water storage type hot water supply apparatus A Heat source unit B Hot water storage unit

Claims (5)

A hot water supply line having first and second auxiliary hot water supply lines is connected to a hot water storage tank in which hot water obtained by heating water with a heat source machine is stored, and a first hot water / water mixing valve is connected to the first hot water / water mixing valve. A second hot water / water mixing valve is provided in each of the second hot water / water supply pipes to control the opening degree of each of the first hot water / water mixing valve and the second hot water / water mixing valve. The hot water supply temperature at the first hot water supply destination connected to the first auxiliary hot water supply line and the hot water supply temperature at the second hot water supply destination connected to the second auxiliary hot water supply line are controlled by the unit. A hot water storage hot water supply device for controlling
A tank hot water temperature sensor for detecting the temperature of the hot water supplied from the hot water storage tank to the hot water supply line;
A water temperature sensor for detecting the temperature of the water flowing through the water supply line;
A temperature sensor that is arranged downstream of each of the first and second hot and cold water mixing valves and detects the temperature of hot water flowing through the portion; and
A flow rate sensor that is arranged downstream of each of the first and second hot water / water mixing valves and detects a flow rate of hot water flowing through the portion;
An operation unit that is connected to the control unit and functions as an information input device that specifies the control content of the opening degree of each of the first and second hot water mixing valves by the control unit;
Relationship between the opening degree of the first hot water mixing valve and the detected temperature of the temperature sensor disposed downstream of the first hot water mixing valve when hot water is supplied at the first and second hot water supply destinations, respectively. A storage unit storing information indicating
With
When the hot water supply is started at the second hot water supply destination while the hot water supply is being performed at the first hot water supply destination, the control unit detects the detection result of the tank hot water temperature sensor and the water temperature sensor. The detection result, the detection result of the flow rate sensor arranged downstream of the first hot water mixing valve, the hot water supply temperature at the first hot water supply point specified by the operation unit, and the operation unit specified Hot water supply temperature at the first hot water supply destination using the starting opening degree of the second hot water / water mixing valve corresponding to the hot water supply temperature at the second hot water supply destination and the information stored in the storage unit A correction value of the opening degree of the first hot and cold water mixing valve is obtained so as to suppress fluctuations of the first hot water and water mixing valve, and the first hot and cold water mixing valve is controlled based on the correction value;
A hot water storage type hot water supply device characterized by that. In the storage unit, an upper limit value of the opening degree of the second hot water / water mixing valve when hot water supply at the second hot water supply destination is started while hot water supply is being performed at the first hot water supply destination. Further stored,
When hot water supply at the second hot water supply destination is started while hot water supply is being performed at the first hot water supply destination, the control unit is configured to control the second value specified by the upper limit value and the operation unit. The start opening of the second hot water / mixing valve corresponding to the hot water supply temperature at the hot water supply destination is compared, and when the start opening exceeds the upper limit, the opening of the second hot / cold water mixing valve is set. Activating the second hot and cold water mixing valve at the upper limit value,
The hot water storage type hot water supply apparatus according to claim 1.   The hot water storage hot water supply apparatus according to claim 1 or 2, wherein the first hot water supply destination is a sink and the second hot water supply destination is a bathtub. A hot water supply line having first and second auxiliary hot water supply lines is connected to a hot water storage tank in which hot water obtained by heating water with a heat source machine is stored, and a first hot water / water mixing valve is connected to the first hot water / water mixing valve. A second hot water / water mixing valve is provided in each of the second hot water / water supply pipes to control the opening degree of each of the first hot water / water mixing valve and the second hot water / water mixing valve. The hot water supply temperature at the first hot water supply destination connected to the first auxiliary hot water supply line and the hot water supply temperature at the second hot water supply destination connected to the second auxiliary hot water supply line are controlled by the unit. A hot water storage hot water supply device for controlling
A tank hot water temperature sensor for detecting the temperature of the hot water supplied from the hot water storage tank to the hot water supply line;
A water temperature sensor for detecting the temperature of the water flowing through the water supply line;
A temperature sensor that is arranged downstream of each of the first and second hot and cold water mixing valves and detects the temperature of hot water flowing through the portion; and
A flow rate sensor that is arranged downstream of each of the first and second hot water / water mixing valves and detects a flow rate of hot water flowing through the portion;
An operation unit that is connected to the control unit and functions as an information input device that specifies the control content of the opening degree of each of the first and second hot water mixing valves by the control unit;
The relationship between the opening degree of the second hot water mixing valve when hot water is supplied at the first and second hot water supply destinations and the detected temperature of the temperature sensor disposed downstream of the second hot water mixing valve A storage unit storing information indicating
With
When the control unit starts hot water supply at the first hot water supply destination while hot water supply is being performed at the second hot water supply destination, the detection result of the tank hot water temperature sensor and the water temperature sensor The detection result, the detection result of the flow sensor arranged downstream of the second hot water mixing valve, the hot water supply temperature at the second hot water supply destination specified by the operation unit, and the operation unit specified Hot water supply temperature at the second hot water supply destination using the opening degree of the first hot water mixing valve corresponding to the hot water supply temperature at the first hot water supply destination and the information stored in the storage unit A correction value of the opening degree of the second hot water / mixing valve is determined so as to suppress fluctuations of the second hot water / water mixing valve, and the second hot water / water mixing valve is controlled based on the correction value;
A hot water storage type hot water supply device characterized by that.   The hot water storage type hot water supply apparatus according to claim 4, wherein the first hot water supply destination is a sink, and the second hot water supply destination is a bathtub.

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