JP2022076658A - Hot water supply method, hot water supply system and program - Google Patents

Abstract

To stabilize a hot water supply temperature during transfer from hot water supply by using a thermal storage tank independently to heating treatment by using second heating means, regardless of conditions such as an outside air temperature.SOLUTION: In a hot water supply method, a first hot water supply unit (4-1) exchanges heat in a thermal storage tank (8) with supply water, and in accordance with a temperature of hot water from the first hot water supply unit, hot water is heated by a second hot water supply unit (4-2). At start of hot water supply or at set timing, a temperature of a first heating medium (HM1) stored in an upper layer in the thermal storage tank is detected and a temperature of a second heating medium (HM2) in the second hot water supply unit is detected. The hot water supply method includes: processing of executing first warming-up mode (base shift mode) by operating the second hot water supply unit when a temperature of the first heating medium is a first threshold temperature or higher and a temperature of the second heating medium is lower than a second threshold value; and processing of executing a second heating mode (pre-heating mode) by using the second hot water supply unit when the temperature of the first heating medium becomes below the first threshold temperature.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat utilization technique for utilizing the heat energy recovered from a heat source and stored for hot water supply heating.

A heat medium heated by exhaust heat generated by a heat source is stored in a heat storage tank to store heat, and the heat storage and water supply are heated by heat exchange to supply hot water. Then, the heat in the heat storage tank is consumed by the hot water supply, and when it becomes impossible to supply hot water at the hot water supply set temperature only by the heat in the heat storage tank, the hot water heated by the heat storage is heated by a water heater or the like, and the request is made. Some hot water is discharged at the temperature.
Regarding such a hot water supply system, when the temperature of hot water measured by a sensor installed in the heat dissipation circulation path is lower than the set temperature, the burner combustion device is activated to bring the hot water to the set temperature with the burner heating type heat exchanger. There is something that raises the temperature (for example, Patent Document 1).
If the hot water temperature of the hot water storage tank is less than the set temperature at the start of hot water supply, adjust the temperature to a low level that does not exceed the lower limit capacity of the auxiliary heat source device from the start of hot water supply to the stop of hot water supply, and perform additional heating by the auxiliary heat source device. It is known to do (Patent Document 2)

Japanese Unexamined Patent Publication No. 2013-238333 Japanese Patent Application Laid-Open No. 2003-148804

By the way, in the hot water supply system, the heat storage state in the heat storage tank, which is the first heating means, is monitored, and when the amount of heat storage is reduced, the combustion of the second heating means such as the water heater is started. However, due to the influence of the flow rate of hot water supply and the temperature of the outside air, there is a possibility that the combustion treatment of the second heating means may not be in time when the amount of heat storage becomes insufficient. Therefore, in the hot water supply system, a process is adopted in which combustion on the second heating means side is started before the temperature of the heat medium in the heat storage tank becomes the set temperature for the hot water supply request, that is, the hot water supply cannot be supplied at the hot water supply set temperature. be.
However, in the hot water supply system, if only the heat storage state in the heat storage tank is used as a trigger for the operation start processing of the second heating means, the combustion of the second heating means may start too early with respect to the heat storage consumption timing. If the combustion of the second heating means starts early, the temperature inside the second heating means becomes too high, and the time until the heat treatment using the heat of the second heating means is started becomes long. , Energy loss due to heat dissipation may occur. Further, on the second heating means side, if the hot water supply is stopped even though the high temperature state is maintained and the heat treatment is started, the energy loss becomes large. Further, in the hot water supply system, even if adjustment control such as changing the monitoring condition of the heat storage state in the heat storage tank to accelerate the consumption timing of the heat storage is performed, the conditions such as the hot water supply set temperature and the flow rate are not constant. There is a problem that the processing becomes complicated in order to correspond to the combustion start timing of the heating means of 2.

The inventor of the present invention performs the warm-up treatment according to the temperature state in the second heating means, so that the heat treatment in the second heating means is required before the heat treatment in the second heating means is required. It was found that by maintaining the temperature in the set state, the heat treatment by the second heating means corresponding to the consumption timing of the heat storage in the heat storage tank can be performed.

Such a problem cannot be solved by the configuration disclosed in Patent Document 1 or Patent Document 2.

Therefore, an object of the present invention is to stabilize the hot water supply temperature in the transition from the hot water supply by the first heating means alone to the heat treatment by the second heating means, regardless of the conditions such as the outside air temperature, in view of the above problems. It is to make it.
Another object of the present invention is to reduce energy loss on the second heating means side.

In order to achieve the above object, one aspect of the hot water supply method of the present invention depends on the temperature of the first hot water supply unit that exchanges heat with the water supply in the heat storage tank and the temperature of the hot water flowing through the first hot water supply unit. A hot water supply method in which the hot water is heated by the second hot water supply unit, the process of detecting the temperature of the first heat medium stored in the upper layer in the heat storage tank at the start of hot water supply or the setting timing, and the first. The process of detecting the temperature of the second heat medium in the hot water supply unit 2 and the temperature of the first heat medium are equal to or higher than the first threshold value, and the temperature of the second heat medium is the second threshold value. If it is less than, the process of operating the second hot water supply unit to execute the first warm-up mode for heating at least the second heat medium, and the temperature of the first heat medium are the first. The process of executing the second warm-up mode in the second hot water supply unit when the value falls below the threshold value is included.

In the hot water supply method, the first warm-up mode includes a process of notifying instruction information not to exchange heat between the second heat medium and the hot water in the second hot water supply unit, and burning the second hot water supply unit. It may include a process of heating the second heat medium until the temperature reaches the first set temperature.
In the hot water supply method, the second warm-up mode includes a process of burning the second hot water supply unit to heat the second heat medium until the temperature reaches the second set temperature, and the first hot water supply unit. It may include a process of flowing a part of the hot water flowing from the hot water supply unit to the heat exchange unit side of the second hot water supply unit to heat the inside of the heat exchange pipeline of the second hot water supply unit.
In the hot water supply method, further, a process of detecting the temperature of the hot water flowing into the second hot water supply unit, and when the temperature of the hot water is lower than the hot water supply set temperature, the second hot water supply unit is burned to obtain the above. It may include a process of heating the second heat medium and a process of switching the mixing means to exchange a part or all of the hot water with the second heat medium to discharge hot water at the hot water supply set temperature.
In the above hot water supply method, when the second hot water supply unit has not heat-treated the hot water, a process of detecting the temperature of the hot water flowing into the second hot water supply unit and storage in the storage unit. The second threshold is extracted from the threshold database based on the step of reading the second threshold from the threshold database of the second heat medium and the detected hot water temperature and hot water supply set temperature, and the second heat. It may include a step of contrasting with the detection temperature of the medium.

In order to achieve the above object, one aspect of the hot water supply system of the present invention is a heat storage tank that stores a first heat medium that recovers heat from a heat source, and a heat storage tank that exchanges heat with water to supply hot water. 1 hot water supply unit, a second hot water supply unit that discharges hot water flowing from the first hot water supply unit through a hot water supply channel at a hot water supply set temperature, and stores in the upper layer side in the heat storage tank at the start of hot water supply or at the set timing. A first temperature sensor that detects the temperature of the first heat medium, a second temperature sensor that detects the temperature of the second heat medium in the second hot water supply unit, and the first heat medium. When the temperature of the second heat medium is equal to or higher than the first threshold value and the temperature of the second heat medium is less than the second threshold value, the second hot water supply unit is operated to heat at least the second heat medium. A control unit that executes the first warm-up mode and also executes the second warm-up mode in the second hot water supply unit when the temperature of the first heat medium falls below the first threshold value. To prepare for.

In the hot water supply system, the control unit notifies the instruction information not to exchange heat between the second heat medium and the hot water in the second hot water supply unit by executing the first warm-up mode, and also notifies the second. The hot water supply unit may be burned to heat the second heat medium until the first set temperature is reached.
The hot water supply system includes a heat exchange unit that exchanges heat between the hot water and the second heat medium, and the control unit burns the second hot water supply unit by executing the second warm-up mode. The second heat medium is heated until it reaches the second set temperature, and a part of the hot water flowing from the first hot water supply unit is flowed to the heat exchange unit side to heat the second hot water supply unit. The inside of the exchange pipeline may be heated.
In the hot water supply system, a third temperature sensor that detects the temperature of the hot water that has flowed into the second hot water supply unit through the hot water supply passage, and the hot water that has exchanged heat with the second heat medium in the heat exchange unit. And a temperature adjusting unit for adjusting the temperature of the hot water by mixing the hot water bypassing the heat exchange unit, and the control unit is the second when the temperature of the hot water is lower than the hot water supply set temperature. The hot water supply unit may be burned to heat the second heat medium, and the mixing ratio of the temperature adjusting unit may be switched to discharge hot water at the hot water supply set temperature.
In the hot water supply system, in the control unit, the hot water before heat exchange is supplied from the temperature adjustment unit to the heat exchange unit, and the temperature of the second heat medium is equal to or higher than the first set temperature. , The combustion of the second hot water supply unit may be stopped.
In the hot water supply system, a third temperature sensor that detects the temperature of the hot water that has flowed into the second hot water supply unit through the hot water supply passage, and the hot water temperature and the hot water supply with respect to the temperature of the second heat medium. The control unit includes a storage unit that stores a threshold value database including the second threshold value registered in association with the set temperature, and the control unit is the second from the threshold value database based on the detected hot water temperature and the hot water supply set temperature. The threshold value of 2 may be extracted and compared with the detected temperature of the second heat medium.

In order to achieve the above object, one aspect of the program of the present invention is a program for being executed by a computer, which is stored in the upper layer side in the heat storage tank of the first hot water supply unit at the start of hot water supply or at the setting timing. The function of acquiring the detected temperature of the first heat medium, the function of acquiring the detected temperature of the second heat medium in the second hot water supply unit, and the temperature of the first heat medium being equal to or higher than the first threshold value. When the temperature of the second heat medium is less than the second threshold value, the second hot water supply unit is operated to execute a first warm-up mode for heating at least the second heat medium. The function of causing the second heat supply unit to execute the second warm-up mode when the temperature of the first heat medium falls below the first threshold value is executed by the computer.

In the above program, the first warm-up mode has a function of notifying instruction information not to exchange heat between the second heat medium and the hot water in the second hot water supply unit, and the function until the first set temperature is reached. It may include a function of burning the second hot water supply unit so as to heat the second heat medium.
In the above program, the second warm-up mode has a function of burning the second hot water supply unit so as to heat the second heat medium until the second set temperature is reached, and the first hot water supply unit. It may include a function of flowing a part of the hot water flowing from the hot water supply unit to the heat exchange unit side of the second hot water supply unit.
In the above program, the function of acquiring the detection temperature of the hot water flowing into the second hot water supply unit and the second heat medium are heated when the temperature of the hot water is lower than the hot water supply set temperature. The function of burning the second hot water supply unit and the mixing means are switched so that a part or all of the hot water flows into the heat exchange unit side, and the heat exchange with the second heat medium causes the hot water supply set temperature. It may include a function of hot water supply.
In the above program, further, when the second hot water supply unit does not heat-treat the hot water, a function of reading the detection temperature of the hot water flowing into the second hot water supply unit and the function stored in the storage unit are provided. The function of reading the second threshold value from the threshold database of the second heat medium, and the second threshold value extracted from the threshold database based on the detected hot water temperature and hot water supply set temperature, the second heat medium. It may include a function of contrasting with the detected temperature of.

According to the present invention, any of the following effects can be obtained.
(1) By warming up the second heating means in multiple stages, it is possible to stabilize the hot water supply temperature in the heat treatment of the second heating means.
(2) In addition to monitoring the heat storage state in the heat storage tank, which is the first heating means, the temperature state on the second heating means side is monitored, and the internal temperature on the second heating means side is monitored according to the monitoring results. By controlling the above, the heat treatment by the second heating means corresponding to the consumption timing of the heat storage in the heat storage tank can be performed.
(3) By warming up the second heating means at a low temperature in advance and warming up at a high temperature immediately before the transition to the heat treatment, even if the hot water supply request is stopped, the second heating means side Energy loss can be reduced.
(4) Convenience can be improved because the heating control by the second heating means can be stabilized regardless of the installation environment and timing conditions of the hot water supply system such as the outside air temperature and the season.
(5) Since the execution of the warm-up process is determined according to the temperature of the heat medium in the second heating means, it is possible to reduce the energy loss due to the useless warm-up process.

It is a flowchart which shows an example of the hot water supply processing which concerns on 1st Embodiment. It is a figure which shows the example of the operation state of the hot water supply system in the 1st warm-up process. It is a figure which shows the example of the operation state of the hot water supply system in the 2nd warm-up process. It is a figure which shows the structural example of the hot water supply system which concerns on 2nd Embodiment. It is a figure which shows the example of the operation state of the hot water supply system by the heat storage single mode. It is a figure which shows the example of the operation state of the hot water supply system by a heat treatment mode. It is a figure which shows the example of the operation state of the hot water supply system by the BB independent mode. It is a figure which shows the structural example of the control part of a hot water supply system. It is a figure which shows the structural example of the upper layer side of a heat storage tank. It is a figure which shows an example of the set temperature condition of a base shift threshold value. It is a figure which shows the change state of the detection temperature of each part, and the setting example of a hot water supply mode. It is a flowchart which shows the transition example of the hot water supply mode of a hot water supply unit (4-1). It is a flowchart which shows the transition example of the hot water supply mode of a hot water supply unit (4-2). It is a flowchart which shows an example of the control process on the side of a hot water supply unit (4-1). It is a flowchart which shows an example of the control process on the side of a hot water supply unit (4-2).

[First Embodiment]
FIG. 1 shows an example of a process of hot water supply treatment according to the first embodiment. The process shown in FIG. 1 is an example of the hot water supply treatment method and program of the present disclosure, and the present invention is not limited to such a configuration.
In this hot water supply process, the hot water supply unit 4-1 that supplies hot water using the heat stored in the heat storage tank 8 and the hot water supply unit 4-2 that passes the hot water that has flowed in from the hot water supply unit 4-1 or heats the hot water supply to the set temperature. It is an example of the operation processing of the hot water supply system 2 including. This hot water supply unit 4-1 is an example of the first hot water supply unit of the present disclosure. The hot water supply unit 4-2 is an example of the second hot water supply unit of the present disclosure. For this hot water supply process, for example, as shown in FIG. 1, a hot water supply start step (S101), a step of determining whether the temperature of the heat medium HM1 in the heat storage tank 8 is equal to or higher than the first threshold value (S102), and a hot water supply unit 4-. The step of determining whether the temperature of the heat medium HM2 in 2 is less than the second threshold value (S103), the step of warming up the hot water supply unit 4-2 to the first warming process (S104), and the hot water supply unit 4-2 to the second. It includes a warm-up process (S105) and a hot water supply process (S106).

Hot water supply start step (S101): The hot water supply system 2 is triggered by, for example, an opening operation of a hot water tap (not shown) or an input operation to the remote controller 60 (FIG. 8), or a water supply pipeline 14-1 connected to the hot water supply unit 4-1. The mode shifts to the hot water supply start mode when the water supply W flows into the water supply W. In the hot water supply system 2, a hot water supply control unit (not shown) installed in the control unit 6, the hot water supply unit 4-1 and the hot water supply unit 4-2 measures the flow rate and water temperature of the water supply W when the hot water supply starts, and sets the hot water supply. Operation control is performed to perform hot water supply processing at temperature.
Step of determining whether the temperature of the heat medium HM1 in the heat storage tank 8 is equal to or higher than the first threshold value (S102): The hot water supply system 2 is based on the temperature sensor 12-1 installed in the heat storage tank 8 of the hot water supply unit 4-1. The detection temperature T1 of the heat medium HM1 is measured. The heat storage tank 8 is an example of the heat storage tank of the present disclosure. The heat medium HM1 is an example of the first heat medium of the present disclosure. Then, the hot water supply system 2 determines that the detected temperature T1 is equal to or higher than the first threshold value. For this first threshold value, for example, a temperature at which hot water HW having a hot water supply set temperature can be generated is set only by the heat medium HM1 stored in the heat storage tank 8.
In the hot water supply process, when the temperature of the heat medium HM1 measured by the temperature sensor 12-1 is equal to or higher than the first threshold value (YES in S102), the temperature shifts to S103 and does not reach the first threshold value (NO in S102). Move to S105.

Step of determining whether the temperature of the heat medium HM2 in the hot water supply unit 4-2 is less than the second threshold value (S103): The hot water supply system 2 is detected by, for example, a temperature sensor 12-2 installed in the hot water supply unit 4-2. The temperature of the heat medium HM2 is determined based on the temperature of either one or both of the heat medium temperature T2 and the heat medium temperature T3 detected by the temperature sensor 12-3. The heat medium HM2 is an example of the second heat medium of the present disclosure. In the hot water supply system 2, it is determined whether or not the temperature of the heat medium HM2 is less than the second threshold value. This second threshold value is an example of the minimum temperature to be maintained with respect to the heat medium HM2 during the hot water supply operation.
Step of first warming up the hot water supply unit 4-2 (S104): In the hot water supply system 2, when the heat medium temperatures T2 and T3 of the heat medium HM2 in the hot water supply unit 4-2 are less than the second threshold value (S103). YES), the first warm-up process is performed on the hot water supply unit 4-2. In the first warm-up treatment, the combustion treatment of the hot water supply unit 4-2 is started to heat the heat medium HM2. In the hot water supply system 2, for example, heat treatment may be performed so that the temperature of the heat medium HM2 in the hot water supply unit 4-2 exceeds the second threshold value.
Then, in the hot water supply system 2, monitoring of the detection temperature T1 of the heat medium HM1 in the heat storage tank 8 is continued.

Step of second warming up the hot water supply unit 4-2 (S105): In the hot water supply system 2, when the temperature of the heat medium HM1 in the heat storage tank 8 becomes less than the first threshold value (NO in S102), hot water supply is performed. To prepare for the transition to heat treatment using unit 4-2, warm up the inside of the hot water supply unit 4-2 so that it reaches the set temperature. In the heat treatment, the hot water HW flowing from the hot water supply unit 4-1 is used as the hot water supply unit 4 when hot water cannot be supplied only by the heat storage in the hot water supply unit 4-1 or when the operation mode is shifted to the operation mode for reducing the heat storage consumption. It is a process of heating to the set temperature of hot water supply in -2.
In the second warm-up process, a higher temperature is set than in the first warm-up process.
Hot water supply treatment (S106): In the hot water supply system 2, for example, the heat storage of the heat medium HM1 in the hot water supply unit 4-1 is consumed during the second warm-up treatment or after the second warm-up treatment is completed. If it becomes impossible to supply hot water independently, heat treatment using the hot water supply unit 4-2 or further heating the water supply W with only the hot water supply unit 4-2 to the hot water supply set temperature is performed. conduct.

<About the first warm-up process>
FIG. 2 shows a configuration example of a hot water supply system that executes the first warm-up process. The configuration shown in FIG. 2 is an example, and the present invention is not limited to such a configuration.
In this hot water supply system 2, for example, as shown in FIG. 2, the hot water supply unit 4-1 and the hot water supply unit 4-2 are connected via the hot water supply passage 14-3, and the hot water supply unit 4-1 is connected to the hot water supply unit 4-2. Hot water HW of the hot water supply set temperature is flowed. Further, in this hot water supply system 2, depending on the heat storage state in the heat storage tank 8, hot water LHW below the hot water supply set temperature or unheated water supply W may flow in the hot water supply passage 14-3.
The heat source device 10 is connected to the upper side of the heat storage tank 8 of the hot water supply unit 4-1 and supplies the heated heat medium HM1.
The heat storage tank 8 is, for example, an open type tank, and the heat generated by the heat source device 10 is recovered through the heat medium HM1 and stored inside the tank. A temperature sensor 12-1 is installed at a predetermined position on the upper layer side of the heat storage tank 8. The heat storage tank 8 is connected to, for example, a heat medium circulation path 14-2 on the upper layer side and the bottom side surface side of the temperature sensor 12-1. The heat medium circulation path 14-2 is connected to the heat exchanger 16, and in the heat exchanger 16, the low-temperature water supply W flowing through the water supply line 14-1 and the heat of the heat medium HM1 are heat-exchanged. For example, tap water or the like flows into the water supply pipeline 14-1, and the water supply W flows in the pipeline due to the water supply pressure. In the heat medium circulation path 14-2, a circulation pump 18 is installed on a conduit returning to the heat storage tank 8, and the circulation pump 18 circulates the heat medium HM1 between the heat storage tank 8 and the heat medium circulation path 14-2. Let me.

The hot water supply unit 4-2 includes, for example, a water supply line 14-4 connected to the hot water supply line 14-3, a bypass line 14-5 downstream of the water supply line 14-4, a hot water supply line 14-6, and a water supply line 14-4. A heat exchange pipeline 14-7 is provided, which is connected to the heat exchanger 28 and allows hot water HW to flow to exchange heat.
In the hot water supply unit 4-2, for example, as a heat source unit for heating hot water HW or cold water, a heat medium circulation path 14-8 for circulating the heat medium HM2 and a heat medium HM2 in the heat medium circulation path 14-8 are provided. It is provided with a circulation pump 26 for circulating, a burner 24 for heating the heat medium HM2, and a heat medium tank 30 for temporarily storing the heat medium HM2.
In the first warm-up process, in the hot water supply unit 4-2, the opening degree of the mixing valve 22 is adjusted, and the hot water HW supplied through the water supply line 14-4 is sent out through the bypass line 14-5. It is possible to get hot water from -6.
As the first warm-up process, the hot water supply unit 4-2 rotates the circulation pump 26 so that the heat medium HM2 reaches a predetermined flow rate, and starts combustion of the burner 24 to raise the temperature of the heat medium HM2. ..
In the hot water supply system 2, for example, if the temperature in the heat storage tank 8 becomes less than the first threshold value during the first warm-up process, the first warm-up process is terminated. Move to the second warm-up process.

<About the second warm-up process>
FIG. 3 shows a configuration example of a hot water supply system that executes a second warm-up process. The configuration shown in FIG. 3 is an example, and the present invention is not limited to such a configuration.
In the hot water supply system 2, after the first warm-up process, the second warm-up mode is executed for the hot water supply unit 4-2 according to the change in the heat storage state in the heat storage tank 8. That is, in this hot water supply system 2, for example, based on the instruction of the control unit 6, the circulation pump 26 is rotated so that the heat medium HM2 has a predetermined flow rate, and the burner 24 is started to burn to the temperature of the heat medium HM2. To heat the inside of the heat medium circulation path 14-8 to a predetermined temperature. Further, based on the instruction of the control unit 6, the opening degree of the mixing valve 22 is adjusted so that a part of the inflowing hot water HW passes through the heat exchanger 28 and flows, and the heat medium HM2 and the supplied hot water HW are adjusted. Heats the inside of the heat exchanger 28 and the heat exchange pipeline 14-7 to a predetermined temperature.

<Effect of the first embodiment>
According to such a configuration, one of the following effects can be expected.
(1) If hot water can be supplied only by the hot water supply unit 4-1 and the temperature of the heat medium HM2 in the hot water supply unit 4-2 is too low, warm up to stabilize the temperature state of the heat medium HM2. By performing the treatment, it is possible to stabilize the hot water supply heat treatment at the start of use of the hot water supply unit 4-2 and to speed up the process until the hot water supply set temperature is reached.
(2) In response to the deterioration of the heat storage state in the heat storage tank 8 in the hot water supply unit 4-1, the inside of the heat medium circulation path 14-8 in the hot water supply unit 4-2 is heated to heat the hot water supply. Stabilization and quickness to reach the set temperature for hot water supply can be achieved.
(3) Responsiveness to the transition of the hot water supply processing mode by gradually warming up the inside of the hot water supply unit 4-2 according to the change in the heat storage state in the heat storage tank 8 in the hot water supply unit 4-1. It is possible to reduce energy loss when hot water supply is stopped.
(4) When the outside air temperature is low or by maintaining the temperature of the heat medium HM2 at a predetermined temperature by performing the first warm-up treatment according to the heat medium temperatures T2 and T3 in the hot water supply unit 4-2. It is not necessary to switch the operation control of the hot water supply system 2 every season, which enhances convenience.

[Second Embodiment]
FIG. 4 shows a configuration example of the hot water supply system according to the second embodiment. The configuration shown in FIG. 4 is an example, and the present invention is not limited to this configuration. Further, in FIG. 4, the same parts as those in FIG. 2 or 3 are designated by the same reference numerals.
As shown in FIG. 4, for example, the hot water supply system 40 includes a hot water supply unit 4-1 and a hot water supply unit 4-2, and also includes a heat source device 42 which is a heat source unit of the hot water supply unit 4-1.

<About the configuration of the hot water supply unit 4-1>
The hot water supply unit 4-1 includes a heat storage tank 8 in which the heat medium HM1 that has recovered the heat of the heat source device 42 is stored. The heat storage tank 8 is provided with a heat medium circulation path 14-11 to and from the heat source device 42, and the low temperature heat medium HM1 on the lower layer side of the tank is flowed to the heat source device 42 side and becomes high temperature by heat exchange. The heat medium HM1 is returned to the upper layer side of the tank. As a result, heat is stored in the heat storage tank 8 in a layered state from low temperature to high temperature from the lower layer side to the upper layer side.
Further, in the hot water supply unit 4-1 as a configuration on the generation side of the hot water HW, the heat supply W flowing through the water supply pipe line 14-1 is heat-exchanged with the heat exchange pipe line 14-9 for flowing to the heat exchanger 16 side. A bypass pipe line 14-10 for bypassing the vessel 16 and flowing to the hot water supply line 14-3 side is provided. A temperature sensor 12-4 for detecting the inflow temperature of the water supply W and a flow rate sensor 44 for detecting the flow rate of the water supply are installed in the water supply pipeline 14-1. These detected temperature T4 and the detected flow rate are used for hot water supply control. In the heat exchange pipe 14-9, a part or all of the water supply W flowing in from the water supply pipe 14-1 is heat-exchanged by the heat exchanger 16 and flows to the hot water supply pipe 14-3 side. A heat exchange line 14-9 and a bypass line 14-10 are connected to the hot water supply line 14-3 via a mixing valve 20. In the mixing valve 20, the mixing ratio of the hot water HW heated by heat exchange and the bypassed water supply W is adjusted by setting the opening degree with respect to the heat exchange pipe 14-9 and the bypass pipe 14-10. .. In the heat exchange pipeline 14-9, a temperature sensor 12-5 for detecting the temperature of the hot water HW after heat exchange is installed on the downstream side of the heat exchanger 16. Further, the hot water supply passage 14-3 is provided with a temperature sensor 12-6 that detects the temperature of the hot water HW after being mixed with the water supply W through the mixing valve 20.

In the heat storage tank 8, for example, the heat of taking out the high-temperature heat medium HM1 on the upper layer side of the tank, flowing it to the heat exchanger 16 side, and returning the low-temperature heat medium HM1 cooled by heat exchange with the water supply W to the bottom side of the tank. It is provided with a medium circulation path 14-2. The heat medium circulation path 14-2 is provided with a circulation pump 18 as a drive source for circulating the heat medium HM1. In the hot water supply unit 4-1, by driving the circulation pump 18, the heat medium HM1 flows to the heat exchanger 16 through the heat medium circulation path 14-2, and the heat medium HM1 and the water supply W exchange heat with each other, so that the water supply W Hot water HW is generated from. The generated hot water HW is discharged to the hot water supply unit 4-2 through the hot water supply passage 14-3.

Further, in the heat storage tank 8, for example, in addition to the temperature sensor 12-1 that detects the heat medium temperature in the upper layer, a plurality of temperature sensors 12-12, 12-13, 12-14 that detect the heat medium temperature in the middle layer and the lower layer are provided. is set up.
A temperature sensor 12-15 for detecting the temperature of the heat medium immediately after flowing in from the upper layer of the heat storage tank 8 is installed in the heat medium circulation path 14-2.
In addition, the hot water supply unit 4-1 is provided with a control unit 48-1 that controls at least a temperature state monitoring process on the heat medium HM1 side and a hot water HW generation process by heat exchange with the heat medium HM1. The control unit 48-1 includes, for example, temperature sensors 12-1, 12-4, 12-5, 12-6, 12-12, 12-13, 12-14, 12-15, a circulation pump 18, and a flow rate sensor. 44, it is connected to the mixing valve 20 by wire or wirelessly.

<About hot water supply unit 4-2>
The hot water supply unit 4-2 heats the hot water HW generated by the inflowing hot water supply unit 4-1 or the water supply W that has passed through the hot water supply unit 4-1 to the hot water supply set temperature, or the hot water supply load as it is without heat treatment. The hot water is discharged toward the side.
In the hot water supply unit 4-2, for example, as a configuration on the hot water generation side, a heat exchange pipe for flowing hot water HW or water supply W flowing through the water supply pipe 14-4 connected to the hot water supply passage 14-3 to the heat exchanger 28. It is provided with a passage 14-7 and a bypass pipe 14-5 that bypasses the heat exchanger 28 and flows to the hot water pipe 14-6 side. A temperature sensor 12-7 for detecting the inflow temperature of the hot water HW or the water supply W and a flow rate sensor 45 are installed in the water supply pipeline 14-4. At the time of hot water supply, the flow rate of the hot water HW or the hot water supply W flowing from the hot water supply unit 4-1 through the hot water supply passage 14-3 is detected by the flow rate sensor 45. These water supply temperature T7 and the detected flow rate are used for hot water supply control. In the heat exchange pipe 14-7, a part or all of the hot water HW and the water supply W flowing in from the water supply pipe 14-4 are heat exchanged by the heat exchanger 28 and flowed to the hot water discharge pipe 14-6 side. A heat exchange pipe 14-7 and a bypass pipe 14-5 are connected to the hot water outlet pipe 14-6 via a mixing valve 22. In the mixing valve 22, the mixing ratio of the hot water HW heated by heat exchange and the bypassed water supply W is adjusted by setting the opening degree with respect to the heat exchange pipe 14-7 and the bypass pipe 14-5. ..

The hot water supply unit 4-2 includes a heat treatment unit 43 for heat exchange with the hot water HW and the water supply W through the heat exchanger 28. The heat treatment section 43 includes, for example, a heat medium circulation path 14-8 through which a second heat medium HM2 flows, a burner 24 for heating the heat medium HM2 by a heat exchanger 46, a circulation pump 26, and a heat medium which is an open tank. It is provided with a temperature sensor 12-2 that detects the temperature on the upstream side of the tank 30 and the heat exchanger 46, and a temperature sensor 12-3 that detects the temperature after heating but before heat exchange with the hot water HW or the water supply W. .. The burner 24 is an example of a heat source that generates combustion heat by burning gas fuel and causes combustion exhaust to flow through the heat exchanger 46.
The heat source for heating the heat medium HM2 of the hot water supply unit 4-2 is not limited to combustion heat, but may be electric heat or solar heat.

In addition, the heat medium circulation path 14-8 is provided with a heat medium tank 30, and the circulating pressure of the heat medium HM2 is controlled by allowing the circulating heat medium HM2 to flow into and stay in the heat medium tank 30. ..
Further, the hot water supply unit 4-2 is provided with a control unit 48-2 that controls at least the temperature state monitoring process of the heat medium HM2 and the hot water HW generation process by heat exchange with the heat medium HM2. The control unit 48-2 is wired or wireless with, for example, temperature sensors 12-2, 12-3, 12-7, 12-8, 12-9, a burner 24, a circulation pump 26, a flow rate sensor 45, and a mixing valve 22. It is connected by such as.

<About the heat source device 42>
The heat source device 42 includes a heat source 50 as a source of heat energy to be recovered by the heat medium HM1. The heat source 50 includes, for example, a fuel cell unit that generates reaction heat, an engine generator that generates combustion exhaust, and means for recovering natural energy such as solar heat and geothermal heat. A heat supply path 52 is connected to the heat source 50, and the heat medium HM3 supplied from the heat source 50 flows to the heat exchanger 54 side. For example, a circulation pump 56 for pumping the heat medium HM1 from the heat storage tank 8 is connected to the heat medium circulation path 14-11, and a temperature sensor 12-for detecting the temperature before and after heat exchange of the heat medium HM1. It is equipped with 10, 12-11. Then, the heat supply path 52 discharges the exhaust gas or the like heat exchanged by the heat exchanger 54 to the outside air or the like. In the heat source device 42, the heat medium HM1 flowing through the heat medium circulation path 14-11 is heated by exchanging heat with the heat energy of the heat medium HM3 supplied from the heat source 50.

<About hot water supply operation control by the hot water supply system 40>
In the hot water supply unit 4-1 for example, as a process of generating hot water HW, heat exchange between the hot water supply W and the heat medium HM1 is performed so that the temperature becomes higher than the hot water supply set temperature. Then, the hot water HW is flowed to the mixing valve 20 side through the heat exchange pipeline 14-9. Then, in the mixing valve 20, the water supply W is mixed with the hot water HW at a mixing ratio according to the opening ratio between the heat exchange pipeline 14-9 side and the bypass pipeline 14-10 side.

(1) Heat storage single mode In the hot water supply unit 4-1 as shown in FIG. 5, for example, as one of the hot water HW generation treatments, the hot water supply W is independently heated and heat treatment is performed by the hot water supply unit 4-2. A heat storage independent mode is set in which hot water HW is discharged at a set temperature for hot water supply. In this heat storage independent mode, the heat storage tank 8 stores the amount of heat required to generate hot water HW at the hot water supply set temperature in the form of heat storage by the heat medium HM1, and heats the heat medium HM1 and the water supply W by exchanging heat. The hot water HW of the hot water supply set temperature can be discharged only by the hot water HW that has been heated, or by the mixed water of the heated hot water HW and the water supply W. At this time, in the hot water supply unit 4-2, for example, the opening degree of the mixing valve 22 is set to the fully open side of the hot water supply pipe line 14-6 so as not to exchange heat between the hot water HW flowing from the hot water supply unit 4-1 and the heat medium HM2. do it.
The control unit 48-1 (FIG. 4) determines, for example, whether the detection temperature T1 in the upper layer of the heat storage tank 8 exceeds the detection temperature T4 (FIG. 4) of the water supply W detected by the temperature sensor 12-4 (T1> T4). If T1> T4, the circulation pump 18 is set so that the detected temperature T5 (FIG. 4) of the hot water HW detected by the temperature sensor 12-5 installed on the outlet side of the heat exchanger 16 becomes equal to or higher than the hot water supply set temperature. Controls the number of rotations. Further, the control unit 48-1 sets the opening degree of the mixing valve 20 in the hot water supply passage 14-3 so that the hot water outlet temperature T6 (FIG. 4) of the hot water HW detected by the temperature sensor 12-6 becomes the hot water supply set temperature. do.

(2) Heat treatment mode In the heat treatment mode, the water supply W is heated to a temperature lower than the hot water supply set temperature by using the heat in the heat storage tank 8, and then the hot water supply unit 4-2 is set so that the hot water HW reaches the hot water supply set temperature. This is an example of a process of heating on the side. In the hot water supply system 40, for example, as shown in FIG. 6, the detection temperature of the temperature sensor 12-1 that detects the upper layer temperature of the heat storage tank 8 in the heat storage state monitoring process performed while hot water supply is being continued or at the start of hot water supply in the heat storage independent mode. When T1 falls below the threshold temperature, it is determined that the amount of heat stored in the hot water supply unit 4-1 is insufficient, and the hot water supply unit 4-2 is operated to execute the heat treatment mode. At this time, the amount of heat of combustion of the burner 24 is adjusted so that the heat medium HM2 after heat exchange reaches a predetermined temperature. As a result, the lack of heat in the heat medium HM1 is compensated for by the heat in the heat medium HM2 increased by heating with the burner 24.

When the water supply temperature T7 (FIG. 4) of the temperature sensor 12-7 falls below the hot water supply set temperature, the control unit 48-2 (FIG. 4) is a heat exchanger of the hot water supply unit 4-2 from the hot water supply passage 14-3. Hot water LHW having a temperature lower than the required hot water supply temperature is flowed into 28, and heat exchange between the heat medium HM2 and hot water LHW is performed to heat the hot water LHW to generate hot water HW. The hot water HW after heat exchange is passed through the mixing valve 22. Then, in the mixing valve 22, the hot water HW after heat exchange is mixed with the hot water LHW before heat exchange at a mixing ratio according to the opening ratio between the heat exchange line 14-7 side and the bypass line 14-5 side. .. The control unit 48-2 (FIG. 4) sets the opening ratio of the mixing valve 22 so that, for example, if the detected temperature T8 (FIG. 4) of the hot water HW after heat exchange is higher than the hot water supply set temperature, the hot water supply set temperature is reached. And let the hot water flow.

(3) In the BB independent mode hot water supply system 40, as shown in FIG. 7, for example, as one of the hot water HW generation processes, the inflowing water supply W is not heated by the hot water supply unit 4-1 and is not heated by the hot water supply unit 4-1. A BB independent mode is set in which the hot water supply unit 4-2 independently heats the water supply W and discharges the hot water HW at the hot water supply set temperature. In this BB independent mode, for example, when the heat energy in the heat storage tank 8 of the hot water supply unit 4-1 is consumed, the heat storage tank 8 loses or may lose the heat medium HM1 exceeding the threshold value. The generation of hot water HW using the heat energy in the tank 8 is stopped. In the hot water supply unit 4-2, hot water HW is generated by utilizing the heat energy of the heat medium HM2 obtained by heating with the burner 24. At this time, the control unit 48-2 (FIG. 4) controls the opening degree of the mixing valve 22 and the combustion control of the burner 24 based on, for example, the water supply temperature T7 (FIG. 4) of the water supply W flowing in through the water supply pipeline 14-4. , The rotation speed of the circulation pump 26 may be controlled.

Further, in this hot water supply system 40, the following control processing is performed as a hot water supply operation using the hot water supply unit 4-1 and the hot water supply unit 4-2. Such a control process switches the control mode according to conditions such as the heat storage state in the heat storage tank 8 and the temperature state of the heat medium HM2 in the hot water supply unit 4-2 to supply hot water at the required hot water supply set temperature. Continue processing.

(4) Base shift mode This base shift mode is an example of the first warm-up process of the present disclosure. For example, as shown in FIG. 2, the timing at which the hot water supply unit 4-1 is operating the hot water supply operation in the heat storage independent mode. This is an example of the process to be executed in.
In the hot water supply unit 4-2, for example, at the start of hot water supply, the temperature information of the heat medium HM2 in the heat medium circulation path 14-8 is acquired, and the temperature reaches the set threshold value (second threshold value in FIG. 1). Judge whether or not. Then, in the control unit 48-2 (FIG. 4), when the temperature of the heat medium HM2 is less than the threshold value, the burner 24 is started to burn and the circulation pump 26 is driven to change the heat medium HM2 to the heat exchanger 46 (FIG. 4). In FIG. 4), heat is exchanged with the combustion exhaust of the burner 24, and the heat is heated until the temperature reaches the threshold value.

This base shift mode is a control for preventing the occurrence of so-called undershoot and the like. For example, the temperature of the heat medium HM2 decreases depending on conditions such as the outside air temperature and the installation environment of the hot water supply unit 4-2. If the heat medium HM2 shifts to the heat treatment mode or the like while the temperature of the heat medium HM2 is lowered, it takes a long time for the heat medium HM2 to reach the set temperature required for heating the hot water HW to the hot water supply set temperature, and the hot water supply is temporarily performed. The temperature drops and undershorts occur.

(5) Preheat mode The preheat mode is an example of the second warm-up process of the present disclosure. For example, as shown in FIG. 3, as a result of the hot water supply unit 4-1 continuing the hot water supply operation in the heat storage single mode, the heat storage tank When the heat energy in 8 is consumed and the detection temperature T1 of the temperature sensor 12-1 becomes less than the threshold value (the first threshold value in FIG. 1), the heat treatment for the hot water LHW below the hot water supply set temperature is started. Prior to this, the heat exchanger 28, the heat exchange pipeline 14-7, and the heat medium circulation passage 14-8, which are heat exchange units in the hot water supply unit 4-2, are warmed up to a predetermined value. be.

<About the configuration example of the control unit>
FIG. 8 shows a configuration example of the control unit of the hot water supply system. The configuration shown in FIG. 8 is an example.
The control unit 6 includes control units 48-1 and 48-2 configured by a computer having a communication function, and a remote control unit 62 of the remote control device 60.
The control unit 48-1 is a control means for the hot water supply unit 4-1 and includes a processor 64-1, a memory unit 66-1, a system communication unit 68-1, and an input / output unit (I / O) 70-1. Controls the hot water supply of the hot water supply unit 4-1.
The processor 64-1 executes arithmetic processing of the OS (Operating System) and the hot water supply control program in the memory unit 66-1. Then, the processor 64-1 cooperates with the control unit 48-2 and the remote control unit 62 via the system communication unit 68-1 to execute information processing necessary for hot water supply control.
The memory unit 66-1 includes a ROM (Read-Only Memory) which is a storage area, a RAM (Random-Access Memory) which is a calculation area such as a program, and the like. A storage element such as a hard disk device or a non-volatile memory for storing data is used in the memory unit 66-1. The memory unit 66-1 is provided with a threshold value DB as an example of a database (DB) used for hot water supply processing, for example. This threshold value DB includes, for example, threshold values such as setting information of hot water supply processing for the detected temperature of the heat medium HM1 in the heat storage tank 8 and opening degree information of the mixing valve 20.
The system communication unit 68-1 communicates with the control unit 48-2 and the system communication unit on the remote control control unit 62 side by wire or wirelessly, and transmits / receives information necessary for control.
The I / O 70-1 receives detection signals from various temperature sensors such as the temperature sensor 12-1 in the hot water supply unit 4-1 and the flow rate sensor 44, and outputs control signals of the mixing valve 20 and the circulation pump 18.

The control unit 48-2 is a control means for the hot water supply unit 4-2, and includes a processor 64-2, a memory unit 66-2, a system communication unit 68-2, and an I / O 70-2.
The processor 64-2 executes arithmetic processing of the OS and the hot water supply control program in the memory unit 66-2. Then, the processor 64-2 cooperates with the control unit 48-1 and the remote control unit 62 via the system communication unit 68-2 to execute information processing necessary for hot water supply control.
The memory unit 66-2 includes a ROM and a RAM. A storage element such as a hard disk device or a non-volatile memory for storing data is used in the memory unit 66-2. RAM constitutes an information processing work area. The ROM contains, for example, the temperature condition of the heat medium HM2 in the heat treatment unit 43, the threshold temperature of the heat medium HM2 when the base shift mode, which is the first warm-up process, is executed with respect to the hot water supply flow rate, and the combustion of the burner 24. Control information, threshold information such as the upper limit temperature of the heat medium HM2 heated in the base shift mode are stored.
The system communication unit 68-2 communicates with the control unit 48-1 and the system communication unit on the remote control control unit 62 side by wire or wirelessly, and transmits / receives information necessary for control.
The I / O 70-2 receives detection signals from various temperature sensors such as the temperature sensor 12-2 in the hot water supply unit 4-2 and the flow rate sensor 45, and generates control signals for the mixing valve 22, the burner 24, and the circulation pump 26. ,Output.

The remote control unit 62 is provided in the remote control device 60 independent of the hot water supply unit 4-1 and the hot water supply unit 4-2, and cooperates with the control units 48-1 and 48-2 by computer communication.

<Installation position of temperature sensor 12-1 of heat storage tank 8>
FIG. 9 shows an enlarged portion of the IX portion of FIG.
As shown in FIG. 9, for example, the temperature sensor 12-1 is installed on the upper layer side of the heat storage tank 8. The installation position of the temperature sensor 12-1 may be determined based on, for example, the heating capacity and the heating rate of the heat treatment unit 43 using the burner 24. In the hot water supply system 40, the detection temperature T1 of the temperature sensor 12-1 is used as a criterion for determining the heat storage state in the heat storage tank 8, and is also a criterion for switching the hot water supply mode of the hot water supply system 40. That is, since the heat storage tank 8 stores heat in a hierarchical state so that the temperature of the heat medium HM1 becomes higher as it goes upward, the heat stored at the same height as the installation height of the temperature sensor 12-1. It can be assumed that the medium HM1 is in the same temperature state. In the hot water supply system 40, the heat medium HM1 above the temperature sensor 12-1 is in a state higher than the detection temperature T1, and the volume at a position higher than the temperature sensor 12-1 is at the detection temperature T1 or higher. It can be judged that the amount of heat stored can be supplied. In the figure, the broken line 72 shows a virtual line of a watershed between the heat medium HM1 on the upper layer side and the low temperature heat medium LHM1 on the lower layer side.

In this hot water supply system 40, a base shift mode is performed in which the temperature of the heat medium HM2 inside the hot water supply unit 4-2 is maintained at a predetermined temperature when the hot water supply unit 4-1 is in a heat storage state where it is possible to supply hot water independently, and the temperature sensor 12 is used. Based on the detected temperature T1 of -1, the preheat mode for warming up the heat exchange unit side in the hot water supply unit 4-2 is executed before the independent hot water supply cannot be performed. As a result, the hot water supply system 40 can shorten the heating time of the heat medium HM2 on the hot water supply unit 4-2 side even in a place where the outside air temperature is low or in the season, and the temperature is stable. Therefore, the temperature sensor 12- In addition to being able to delay the start of the preheat mode by raising the installation position of 1, it is possible to use a heat storage tank with a small volume.

FIG. 10 is a graph showing an example of a hot water supply set temperature condition of a base shift threshold value. The set values and the tendency of temperature change shown in FIG. 10 are examples.
The base shift threshold value is an example of the second threshold value of the present invention, and is stored as a database in at least the memory unit 66-2 of the hot water supply unit 4-2. The base shift threshold data includes threshold information used by the hot water supply system 40 when executing the base shift mode. As shown in FIG. 10, for example, the base shift threshold value is the threshold temperature of the heat medium HM2 with respect to the hot water supply flow rate L [L / min] for each set temperature of hot water supply or the set temperature of heating in the heat treatment by the hot water supply unit 4-2. ℃] is shown. As a result, the control unit 48-2 reads, for example, this threshold value database, determines whether or not each threshold value information and the temperature of the heat medium HM2 need to be shifted to the base shift mode, and when the shift to the base shift mode is performed, the burner 24 Perform the combustion process. Further, the set temperature of the base shift threshold value is an example of the first set temperature of the present invention, and is a set temperature for heating the heat medium HM2 in the base shift mode.

For example, when the hot water supply flow rate flowing into the hot water supply unit 4-2 is in the range of L0 to L1 and the temperature of the heat medium HM2 is less than TX1, the control unit 48-2 of the heat medium HM2 regardless of the hot water supply set temperature. Combustion control is performed so that the temperature becomes TX1 or higher. Further, when the hot water supply flow rate is based on L1 and the hot water supply flow rate is higher than that, the control unit 48-2 shifts to the base shift mode and burns based on the threshold temperature set according to the hot water supply set temperature. Take control.
When the hot water supply set temperature is TS1 [° C.] or less, the threshold temperature of the heat medium HM2 increases proportionally between TX1 [° C.] and TX4 [° C.], for example, with respect to the value of hot water supply flow rate from L1 or more to L5. It is set to do. Further, when the hot water supply flow rate is L5 or more, the threshold temperature of the heat medium HM2 is TX4.
When the hot water supply set temperature is (TS2-TS3) [° C.], the threshold temperature of the heat medium HM2 suddenly changes from TX1 [° C.] to TX2 [° C.], for example, when the hot water supply flow rate is between L1 and L2. There is a gradual increase between the hot water supply flow rates L2 and L4, and the threshold temperature of the heat medium HM2 changes from TX2 to TX5. When the hot water supply flow rate is L4 or more, the threshold temperature of the heat medium HM2 is TX5.
When the hot water supply set temperature is (TS4-TS5) [° C.], the threshold temperature of the heat medium HM2 suddenly changes from TX1 [° C.] to TX3 (> TX2) [° C.], for example, when the hot water supply flow rate is between L1 and L2. Further, there is a gradual increase between the hot water supply flow rates L2 and L3, and the threshold temperature of the heat medium HM2 changes from TX3 to TX6. When the hot water supply flow rate is L3 or more, the threshold temperature of the heat medium HM2 is TX6.
As described above, when the base shift mode is executed, the higher the hot water supply set temperature, the larger the change in the threshold temperature of the heat medium HM2 due to the change in the hot water supply flow rate L of the hot water supply request.

The base shift threshold shown in FIG. 10 is, for example, the decreasing tendency of the amount of heat stored in the heat storage tank 8 when hot water is discharged under the hot water supply requirement conditions of a plurality of different hot water supply flows, and the time during which hot water can be discharged from the hot water supply unit 4-1 at the hot water supply set temperature. The correlation between the combination of information and the heating rate of the heat medium HM2 of the hot water supply unit 4-2 may be determined and set. In addition, the base shift threshold value may be calculated or adjusted according to the conditions such as the installation environment of the hot water supply unit 4-2 in the hot water supply system 40.

A, B, C, D, and E in FIG. 11 represent the state of temperature change in the hot water supply process, and F in FIG. 11 represents the operation timing of the hot water supply operation mode.
A of FIG. 11 shows the detection temperature T1 (solid line) of the temperature sensor 12-1 installed in the heat storage tank 8 and the detection temperature of the heat medium HM1 circulating from the upper layer side of the heat storage tank 8 toward the heat exchanger 16 side. It represents T15 (broken line). In the hot water supply system 40, for example, as shown in FIG. 11F, when hot water supply starts, the hot water supply unit 4-1 operates in a heat storage independent operation mode. At this time, in the hot water supply unit 4-1 the heat storage is consumed by the heat exchange between the heat medium HM1 and the water supply W, and the heat medium HM1 is detected at the position of the temperature sensor 12-1 of the heat storage tank 8 at a predetermined timing. The temperature T1 gradually decreases. At this time, since the high-temperature heat medium HM1 in the upper layer of the tank flows through the heat medium circulation path 14-2, the detection temperature T15 of the temperature sensor 12-15 has no temperature change or has a slight change. When the hot water supply process continues, the detected temperature T1 of the temperature sensor 12-1 further decreases, and in conjunction with the decrease, the detected temperature T15 of the temperature sensor 12-15 also decreases.
Then, in the hot water supply system 40, when the detected temperature T1 becomes equal to or lower than the threshold value, the hot water supply unit 4-2 is started to warm up in the preheat mode (F in FIG. 11), and then the hot water supply unit 4-1 described later is further described. The hot water supply unit 4-2 shifts to the heat treatment mode according to the decrease in the hot water temperature T6. Then, when the heat storage amount of the heat medium HM1 is further reduced, the hot water supply system 40 stops the heat exchange between the heat medium HM1 and the water supply W, and causes heat treatment only by the hot water supply unit 4-2 in the BB independent mode (FIG. FIG. Move to F) of 11.

As shown in FIG. 11B, for example, the hot water outlet temperature T6 of the hot water supply unit 4-1 rapidly increases from the start of hot water supply in the heat storage independent operation mode (F in FIG. 11) and then rises to the hot water supply set temperature. It is maintained at the set temperature for hot water supply. In the hot water supply unit 4-1, for example, the opening degree of the mixing valve 20 is adjusted based on the detection temperature T4 of the water supply W, the detection temperature T15 of the heat medium HM1, and the detection flow rate of the flow rate sensor 44, and the hot water is discharged at the hot water supply set temperature. Realize. In the hot water supply system 40, the preheat mode is started while hot water can be discharged at the hot water supply set temperature by heat exchange with the heat medium HM1. When the hot water supply process is continued, the hot water supply temperature T6 in the hot water supply unit 4-1 decreases, and the hot water supply set temperature cannot be discharged only by exchanging the heat of the heat medium HM1. It shifts to the heat treatment mode that heats hot water until. At this time, in the hot water supply unit 4-1, for example, when the heat treatment mode is executed, the opening degree of the mixing valve 20 is adjusted to continuously and effectively utilize the heat storage in the heat storage tank 8, and the heat medium HM1 The amount of the water supply W mixed in with respect to the hot water HW after the heat exchange with the hot water HW may be increased, and the hot water temperature T6 may be adjusted to be low.
When the amount of heat stored in the heat storage tank 8 is further reduced and the BB independent mode is started, the hot water supply unit 4-1 does not allow the water supply W to flow into the heat exchanger 16 side, and the hot water supply unit 4-2 side as it is. The hot water temperature T6 becomes equal to the temperature of the water supply W.

C, D, and E in FIG. 11 represent temperature changes on the hot water supply unit 4-2 side.
As for the hot water outlet temperature T9 from the hot water supply unit 4-2, for example, as shown in FIG. 11C, when hot water supply is started, the low temperature water accumulated inside the pipe is flushed to the hot water outlet pipeline 14-6 side. When the hot water HW heated by the hot water supply unit 4-1 flows in, the temperature gradually rises to reach the hot water supply set temperature. Then, in the hot water supply system 40, after the hot water supply unit 4-2 is executed in the preheat mode, the hot water LHW heated to a temperature lower than the hot water supply set temperature by the hot water supply unit 4-1 is heated and the BB independent treatment is performed. However, the temperature of the hot water temperature T9 does not change, or can be kept within a minute range.

The water supply temperature T7 for the hot water supply unit 4-2 detects hot water HW, hot water LHW, or hot water supply W supplied through the hot water supply passage 14-3 of the hot water supply unit 4-1 as shown in D of FIG. 11, for example. .. As for the water supply temperature T7, the hot water supply set temperature is detected when the heat storage independent mode is executed, but the temperature drops sharply when the heat treatment mode is entered.

When the heat medium temperature T3 of the heat medium HM2 of the hot water supply unit 4-2 is lower than the base shift threshold, for example, as shown in E of FIG. 11, hot water supply is started in the heat storage independent operation mode. In accordance with this, the base shift mode is executed, and the temperature rises due to heat exchange with the combustion exhaust of the burner 24. The control unit 48-2 of the hot water supply unit 4-2 controls the combustion amount of the burner 24 and the rotation of the circulation pump 26 so that the heat medium HM2 reaches the threshold temperature based on the threshold database. Further, in the hot water supply unit 4-2, when the preheat mode is executed, the burner 24 is burned so as to reach a predetermined heat medium temperature T3 to heat the heat medium HM2. In the hot water supply unit 4-2, combustion control is performed so as to maintain the heat medium temperature T3 even in the heat treatment mode and the BB single mode.

<About hot water supply processing of hot water supply unit 4-1>
FIG. 12 shows an example of transition of the operation mode of the hot water supply unit 4-1. The process shown in FIG. 12 is an example of the hot water supply treatment method and program of the present disclosure, and the present invention is not limited to such a configuration.
As shown in FIG. 12, for example, when the hot water supply tap or the like is opened in the hot water supply unit 4-1 when the high temperature heat medium HM1 is stored in the heat storage tank 8 and the hot water supply unit 4-1 is in a fully stored state, the water supply W flows in. Then, the flow rate is turned on (S201), and the hot water supply system 40 starts to discharge hot water.
The hot water supply system 40 instructs the hot water supply unit 4-1 to operate in the heat storage independent mode (S202). Further, after the start of hot water supply, the hot water supply system 40 calculates the required heat medium flow rate QA as a monitoring of the hot water supply request and the hot water supply capacity by the hot water supply unit 4-1 and compares it with the limit heat medium flow rate QP of the hot water supply unit 4-1. (S203). This required heat medium flow rate QA is a heat medium circulation flow rate required for hot water HW having a hot water supply set temperature to be discharged only by the hot water supply unit 4-1. This required heat medium flow rate QA is, for example, hot water supply set temperature information, detection temperature T4 of water supply W, detection temperature T1 of the temperature sensor 12-1 in the heat storage tank 8, and hot water supply capacity on the hot water supply unit 4-1 side, for example, No. 24. It is calculated based on conditions such as being able to supply hot water with. That is, the required heat medium flow rate QA is, for example, when the hot water supply in the heat storage single mode is continued and the temperature of the heat medium HM1 which is a decrease in the heat storage amount decreases, the water entry temperature is low, or the hot water supply. It increases when the set temperature is high.
The critical heat medium flow rate QP is an example of the hot water supply capacity capable of discharging hot water by the hot water supply unit 4-1. For example, the maximum flow rate of the circulation pump 18 for flowing the heat medium HM1 in the heat medium circulation path 14-2, 20 (L). / Min) etc. are set. In this process, the hot water supply unit 4-1 monitors whether or not hot water can be supplied in the heat storage independent mode in response to the hot water supply request.

When the calculated required heat medium flow rate QA is smaller than the limit heat medium flow rate QP (NO in S203), the hot water supply system 40 assumes that the heat storage tank 8 has a heat storage capacity capable of supplying hot water independently, and is in the heat storage single mode. Supply hot water. At this time, the hot water supply system 40 may perform base shift mode control or the like on the hot water supply unit 4-2 side based on the detected temperature of the temperature T1 in the heat storage tank 8, for example.
Further, when the required heat medium flow rate QA becomes larger than the limit heat medium flow rate QP (YES in S203), the hot water supply system 40 outputs a heat exchange instruction including combustion permission of the burner 24 to the hot water supply unit 4-2. (S204).

When the hot water supply system 40 determines that the independent hot water supply capacity of the hot water supply unit 4-1 has begun to be insufficient, the required heat medium flow rate QB is used as a monitoring process for the heating capacity of the heat medium HM1 flowing in the heat medium circulation path 14-2. Is calculated and compared with the critical heat medium flow rate QP (S205). This required heat medium flow rate QB is a heat medium circulation flow rate required for hot water HW having a hot water supply set temperature to be discharged by the heat medium HM1 flowing in the heat medium circulation path 14-2. The required heat medium flow rate QB is, for example, hot water supply set temperature information, hot water supply W detection temperature T4, immediately after hot water is discharged from the heat storage tank 8, detection temperature T15 by the temperature sensor 12-15 before heat exchange with water supply W, and hot water supply unit. The hot water supply capacity on the 4-1 side is calculated based on conditions such as the ability to supply hot water with No. 24.
When the calculated required heat medium flow rate QB is smaller than the critical heat medium flow rate QP (NO in S205), the hot water supply system 40 assumes that the heat storage tank 8 has a heat storage capacity capable of supplying hot water independently, and is in the heat storage single mode. Supply hot water. When the required heat medium flow rate QB becomes larger than the critical heat medium flow rate QP (YES in S205), the hot water supply system 40 outputs an instruction to shift to the heat treatment mode to the hot water supply unit 4-2 (S206).

Further, the hot water supply system 40 monitors the temperature T4 of the water supply W for the hot water supply unit 4-1 and the temperature of the heat medium HM1 discharged from the heat storage tank 8 (S207). Then, when the temperature T15 of the heat medium HM1 becomes lower than 5 ° C. as the temperature T4 of the water supply + the predetermined temperature (YES in S207), the hot water supply system 40 shifts to the BB independent mode by the hot water supply unit 4-2 (S208).

<About hot water supply processing of hot water supply unit 4-2>
FIG. 13 shows an example of a transition of the hot water supply mode of the hot water supply unit 4-2. The processing content and processing procedure shown in FIG. 13 are examples.
As shown in FIG. 13, for example, in the hot water supply unit 4-2, the hot water supply tap or the like is opened when the high temperature heat medium HM1 is stored in the heat storage tank 8 of the hot water supply unit 4-1. Then, the water supply W flows in, the flow rate becomes ON (S301), and the hot water discharge is started. Since the hot water supply unit 4-2 is executing the heat storage independent mode by the hot water supply unit 4-1 in the fully stored state, the base shift mode is set (S302), the temperature of the heat medium HM2 is monitored, and the temperature condition thereof. The hot water supply unit 4-2 including the HM2 is warmed up according to the above.
The hot water supply unit 4-2 stops combustion when the temperature of the heat medium HM2 in the heat medium circulation path 14-8 reaches the set condition (S303). The hot water supply unit 4-2 continues the warm-up process, for example, during the independent operation of the hot water supply unit 4-1 and starts combustion again when the temperature of the heat medium HM2 in the heat medium circulation path 14-8 drops. Let it warm up.

The hot water supply unit 4-2 continues the base shift mode until there is a heat exchange instruction including the combustion permission of the burner 24 (NO in S304), and shifts to the preheat mode when there is a heat exchange instruction (YES in S304). (S305). In the preheat mode, the second warm-up is performed with respect to the inside of the heat treatment unit 43 including the heat medium HM2 during the single hot water supply by the hot water supply unit 4-1 and before the heat treatment by the hot water supply unit 4-2 is started. Perform processing.

The hot water supply unit 4-2 monitors the temperature of the hot water LHW or the hot water supply W flowing from the hot water supply unit 4-1 through the hot water supply passage 14-3 (S306), and this temperature is the hot water supply set temperature-predetermined temperature (here, 2 ° C.). ), Wait until it becomes lower than (NO in S306). Then, when the temperature of the inflowing hot water LHW or the hot water supply W is lower than the hot water supply set temperature -2 ° C. (YES in S306), the hot water supply unit 4-2 shifts to the hot water discharge process of heating by heat exchange with the heat medium HM2. (S307). The hot water discharge treatment (S307) of the hot water supply unit 4-2 includes a heat treatment and a BB independent operation treatment according to the heat storage state of the heat medium HM1 in the hot water supply unit 4-1.

<About hot water supply control on the hot water supply unit 4-1 side>
FIG. 14 shows a hot water supply control process on the hot water supply unit 4-1 side. The processing content and processing procedure shown in FIG. 14 are examples.
The control unit 48-1 of the hot water supply unit 4-1 determines whether or not the flow rate is turned on as a determination of whether or not there is a hot water supply request (S401). The ON of the flow rate may be determined by detecting the water supply flow rate by the flow rate sensor 44. When the flow rate is turned ON (YES in S401), the control unit 48-1 determines whether or not the heat storage alone mode is used (S402). The hot water supply operation in the heat storage independent mode is determined, for example, when the detected temperature T1 of the temperature sensor 12-1 of the heat storage tank 8 is equal to or higher than the threshold value.
Further, when the flow rate is not ON (NO in S401), the control unit 48-1 waits until a hot water supply request is generated.

When the hot water supply operation is performed in the heat storage independent mode (YES in S402), the control unit 48-1 sets the opening degree of the mixing valve 20 so that hot water can be discharged at the hot water supply set temperature (S403), and the heat medium. The operation of the circulation pump 18 that circulates the HM1 is controlled (S404). Then, the control unit 48-1 outputs instruction information of "no heat exchange instruction" to the control unit 48-2 of the hot water supply unit 4-2 (S405). The instruction information of "no heat exchange instruction" is to execute the base shift mode for the hot water supply unit 4-2 to warm up the heat medium HM2 in the heat treatment unit 43 so that the temperature becomes higher than the set temperature. be. The specific instructions are to control the opening degree of the mixing valve 22 so that the hot water HW does not flow into the heat exchange pipeline 14-7 side and cause heat exchange, and the heat medium HM2 to be above the set temperature. Operation instructions such as controlling the burner 24 to perform combustion processing and controlling the circulation pump 26 to adjust the rotation speed are included.

When the control unit 48-1 determines that the hot water supply operation is not in the heat storage independent mode (NO in S402), the control unit 48-1 determines whether or not the preheat mode is set (S406). The preheat mode setting is determined, for example, when the detection temperature T1 of the temperature sensor 12-1 becomes higher than the hot water supply set temperature and is lower than the set threshold value. When the preheat mode is set (YES in S406), the control unit 48-1 sets the opening degree of the mixing valve 20 so that hot water can be discharged at the hot water supply set temperature (S407), and controls the operation of the circulation pump 18. (S408).
The control unit 48-1 outputs instruction information of "heat exchange instruction" to the control unit 48-2 of the hot water supply unit 4-2 (S409). For the instruction information of "heat exchange instruction", for example, a preheat mode is executed for the hot water supply unit 4-2 to heat the heat medium HM2 in the heat treatment unit 43 to a set temperature or higher, and the mixing valve is used. 22 includes an instruction to warm up the heat exchange unit by changing the opening degree and allowing a part of the hot water HW to flow into the heat exchange pipeline 14-7.

When the control unit 48-1 determines that the hot water supply operation is not in the preheat mode (NO in S406), the control unit 48-1 determines whether or not the heat treatment mode is set (S410). The heat treatment mode setting is determined, for example, when the detection temperature T1 of the temperature sensor 12-1 is less than the threshold temperature and the heat exchange of the hot water supply set temperature cannot be performed only by the heat medium HM1 in the heat storage tank 8. When the heat treatment mode is set (YES in S410), the control unit 48-1 fixes the opening degree of the mixing valve 20 at an intermediate position (S411) and controls the operation of the circulation pump 18 (S412).
The control unit 48-1 outputs instruction information of "heat exchange is instructed" to the control unit 48-2 of the hot water supply unit 4-2 (S413). For the instruction information of "heat exchange instruction", for example, a heat treatment mode is executed for the hot water supply unit 4-2, and combustion control of the burner 24 is performed according to the temperature of the hot water LHW flowing from the hot water supply unit 4-1. And by controlling the rotation speed of the circulation pump 26, the hot water LHW is heated and the instruction to control the hot water supply set temperature is included.

When the control unit 48-1 determines that the hot water supply operation is not in the heat treatment mode (NO in S410), the BB independent mode is set (S414). When the BB independent mode is set (S414), the control unit 48-1 fixes the opening degree of the mixing valve 20 at an intermediate position (S415) and stops the circulation pump 18 (S416).
The control unit 48-1 outputs instruction information of “heat exchange is instructed” to the control unit 48-2 of the hot water supply unit 4-2 (S417). The instruction information of "with heat exchange instruction" includes, for example, an instruction to discharge hot water HW having a hot water supply set temperature only by the hot water supply unit 4-2.

<About hot water supply control on the hot water supply unit 4-2 side>
FIG. 15 shows a hot water supply control process on the hot water supply unit 4-2 side. The processing content and processing procedure shown in FIG. 15 are examples.
In the hot water supply unit 4-2, for example, as shown in FIG. 15, when the hot water HW, the hot water LHW, or the hot water supply W flows in from the hot water supply unit 4-1 the operation process is started.
The control unit 48-2 of the hot water supply unit 4-2 determines whether or not the flow rate has been turned ON as a determination of whether or not there is a hot water supply request (S501). The ON of the flow rate may be determined by detecting the water supply flow rate by the flow rate sensor 45. When the flow rate is turned ON (YES in S501), the control unit 48-2 determines whether or not the instruction information of "there is an instruction for heat exchange" is received (S502). When the instruction information of "no heat exchange instruction" is received instead of the instruction information of "with heat exchange" (NO of S502), the process shifts to the determination of whether or not to execute the base shift mode. At this time, in the hot water supply unit 4-2, although the hot water HW is flowing in due to the flow rate ON, heat exchange with the hot water HW is unnecessary, so that the control unit 48-2 is supplied with hot water in the heat storage independent mode. You can judge that it is.
The control unit 48-2 determines whether or not the heat medium temperature T2 of the temperature sensor 12-2 located upstream of the heat exchanger 46 where the heat medium HM2 is heated by the burner 24 is higher than the threshold TX ( Together with S503), it is determined whether or not the heat medium temperature T3 downstream of the heat exchanger 46 is lower than the threshold TX (S504). The control unit 48-2 of the hot water supply unit 4-2 may read the database of the base shift threshold value from the memory unit 66-2 and set the threshold value TX based on the information of the hot water supply set temperature and the hot water supply flow rate. Based on the temperature determination of the heat medium HM2, when either the heat medium temperature T2 or T3 is less than the threshold value TX (NO in S503, YES in S504), the base shift mode control is started (S505). Then, when both the heat medium temperatures T2 and T3 become higher than the threshold value TX and the heat medium HM2 is warmed up (YES in S506), the control unit 48-2 stops the base shift mode control (S507). ).

Further, when the control unit 48-2 receives the instruction information of "there is an instruction for heat exchange" (YES in S502), the control unit 48-2 controls the combustion of the burner 24 (S508). In this combustion control, for example, it is determined whether it is a preheat mode, a heat treatment mode, or a BB independent mode according to the hot water HW, the hot water LHW, or the water supply temperature T7 flowing into the hot water supply unit 4-2, and the burner. The combustion amount of 24 and the operation of the circulation pump 26 are controlled.
The control unit 48-2 determines, for example, whether or not the water supply temperature T7 is lower than the hot water supply set temperature −TL [° C.] (S509). This temperature TL is a threshold value for determining the hot water supply operation mode set in the hot water supply unit 4-2 or the hot water supply capacity (heat storage state) of the hot water supply unit 4-1. Therefore, a plurality of values may be set.
When the water supply temperature T7 is less than the hot water supply set temperature −TL [° C.] ”(YES in S509), the control unit 48-2 operates the mixing valve 22 so that the hot water supply set temperature can be output to the heat exchange unit side. The flow rate and the flow rate of the hot water HW that bypasses the heat exchange unit may be adjusted (S510).

<Effect of the second embodiment>
According to such a configuration, one of the following effects can be obtained.
(1) The same effect as that of the first embodiment can be obtained.
(2) During the single hot water supply by the hot water supply unit 4-1, the heat medium HM2 is maintained at a predetermined temperature or higher by performing a warm-up treatment in the hot water supply unit 4-2 in the base shift mode at the start of the heat treatment mode. It is possible to prevent the hot water supply temperature from being temporarily lowered due to insufficient time required for heating the hot water LHW on the heat treatment unit 43 side.
(3) The heat medium HM2 is warmed up by the base shift mode to stabilize the temperature, and the heat treatment unit 43 is operated in advance before the heat medium HM1 in the heat storage tank 8 cannot supply hot water independently by the preheat mode. By warming up the inside of the heat exchange unit, it is possible to suppress the influence of the season and the installation environment of the hot water supply system 40 and maintain the hot water supply at the set temperature.
(4) The heat treatment of the heat medium HM2 by the burner 24 for switching the operation mode can be expedited by the two-step warm-up treatment in the base shift mode and the preheat mode, so that the heat storage state can be maintained even when a tank with a small volume is used. By changing the installation position of the temperature sensor 12-1 to be determined, it is possible to maintain the hot water supply at the set temperature, and the convenience and reliability of the device are improved.
(5) Since the temperature of the heat medium HM2 can be stabilized by warming up in the base shift mode, the preheat time before the heat storage amount is consumed by the heat medium HM1 in the heat storage tank 8 can be shortened. By shortening the preheat time, the heating time of the heat medium HM2 until the heat treatment can be shortened, and even if the hot water supply request is stopped in the middle, the fuel gas and heat energy are reduced due to the decrease in the total combustion amount in the preheat mode. Waste can be reduced.

[Modification example]

Modifications of the embodiments described above are listed below.

(1) In the above embodiment, the case where the temperature of the heat medium HM2 in the hot water supply unit 4-2 is used as a criterion for executing the base shift mode is shown, but the present invention is not limited to this. In the hot water supply systems 2 and 40, for example, the outside air temperature at the position where the hot water supply unit 4-2 is installed may be measured, and the base shift may be executed according to the outside air temperature.

(2) In the above embodiment, the execution process of the base shift mode is triggered by the start of the hot water supply operation by the hot water supply unit 4-1 but is not limited to this. The hot water supply unit 4-2 may execute the base shift mode in order to warm up when the temperature of the heat medium HM2 becomes less than the threshold value. Further, the hot water supply unit 4-2 grasps the trend data of the hot water supply demand by the user who requests hot water supply to the hot water supply systems 2 and 40, for example, in order to prevent waste of combustion due to the warm-up treatment of the heat medium HM2. , The execution frequency of the base shift mode may be increased in a time zone or a day when hot water supply demand is high.

(3) The hot water supply systems 2 and 40 determine the execution of the base shift mode based on the detection temperature of the heat medium HM2, for example, when the single hot water supply of the hot water supply unit 4-1 is started, but the present invention is not limited to this. .. Even if the hot water supply systems 2 and 40 refer to the accumulated data of whether or not the base shift mode has been performed in the latest operation history and predict whether or not the heat medium HM2 needs to be warmed up at the time of this hot water supply request. good. Further, the hot water supply systems 2 and 40 store a log of hot water supply processing within a certain period of time, and when the base shift mode is performed in the latest hot water supply process, the heat treatment mode, and the BB independent mode are set. If this is the case, it may be determined that the temperature of the heat medium HM2 is high, and the execution determination of the base shift mode may be omitted.

In the above embodiment, the temperature conditions set in the database of the base shift threshold value are the second threshold value for starting the base shift mode of the hot water supply unit 4-2 and the first set temperature which is the set temperature for the combustion control. The case is shown, but it is not limited to this. In the hot water supply systems 2 and 40, the second threshold value of the heat medium HM2 for determining the transition of the base shift mode and the first set temperature for the combustion control for heating the heat medium HM2 are set to different values. May be good.

As described above, the most preferable embodiment of the present invention has been described. The present invention is not limited to the above description. Various modifications and modifications can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the form for carrying out the invention. Needless to say, such modifications and modifications are included in the scope of the present invention.

In the hot water supply system of the present invention, when hot water is supplied using heat storage, the heat treatment by the second heating means is performed by combining the warming of the heat medium on the second heating means side and the processing of warming the inside of the heat exchanger. It is useful because it can prevent the hot water supply temperature from dropping at the start of.

2, 40 Hot water supply system 4-1 Hot water supply unit 4-2 Hot water supply unit 6 Control unit 8 Heat storage tank 10 Heat source device 12-1 to 12-15 Temperature sensor 14-1, 14-4 Water supply pipeline 14-2, 14-8 , 14-11 Heat medium circulation path 14-3 Hot water supply path 14-5, 14-10 Bypass line 14-6 Outlet line 14-7, 14-9 Heat exchange line 16, 28, 54 Heat exchanger 18, 26, 56 Circulation pump 20, 22 Mixing valve 24 Burner 30 Heat medium tank 42 Heat source device 43 Heat treatment unit 44, 45 Flow sensor 46 Heat exchanger 48-1, 48-2 Control unit 50 Heat source 52 Heat supply path 60 Remote control device 62 Remote control unit 64-1, 64-2 Processor 66-1, 66-2 Memory unit 68-1, 68-2 System communication unit 70-1, 70-2 I / O
72 dashed line

Claims (16)

A first hot water supply unit that exchanges heat with water in a heat storage tank, and a hot water supply method in which the hot water is heated by a second hot water supply unit according to the temperature of the hot water flowing in through the first hot water supply unit.
A process of detecting the temperature of the first heat medium stored in the upper layer in the heat storage tank at the start of hot water supply or at the set timing.
The process of detecting the temperature of the second heat medium in the second hot water supply unit and
When the temperature of the first heat medium is equal to or higher than the first threshold value and the temperature of the second heat medium is lower than the second threshold value, the second hot water supply unit is operated to at least the second. The process of executing the first warm-up mode to heat the heat medium of
A process of executing the second warm-up mode in the second hot water supply unit when the temperature of the first heat medium falls below the first threshold value.
A hot water supply method characterized by including. The first warm-up mode is
A process of notifying instruction information not to exchange heat between the second heat medium and the hot water in the second hot water supply unit, and
A process of burning the second hot water supply unit and heating the second heat medium until the temperature reaches the first set temperature.
The hot water supply method according to claim 1, wherein the hot water supply method comprises. The second warm-up mode is
A process of burning the second hot water supply unit to heat the second heat medium until the temperature reaches the second set temperature.
A process of flowing a part of the hot water flowing from the first hot water supply unit to the heat exchange unit side of the second hot water supply unit to heat the inside of the heat exchange pipeline of the second hot water supply unit.
The hot water supply method according to claim 1 or 2, wherein the method comprises. Further, a process of detecting the temperature of the hot water flowing into the second hot water supply unit and a process of detecting the temperature of the hot water.
When the temperature of the hot water is lower than the hot water supply set temperature, the process of burning the second hot water supply unit to heat the second heat medium and the process of heating the second heat medium.
A process of switching the mixing means to exchange heat with a part or all of the hot water with the second heat medium to discharge hot water at the hot water supply set temperature.
The hot water supply method according to any one of claims 1 to 3, wherein the hot water supply method comprises. Further, when the second hot water supply unit has not heat-treated the hot water, a process of detecting the temperature of the hot water flowing into the second hot water supply unit and a process of detecting the temperature of the hot water have flowed into the second hot water supply unit.
A step of reading the second threshold value from the threshold value database of the second heat medium stored in the storage unit, and
A step of extracting the second threshold value from the threshold value database based on the detected hot water temperature and the hot water supply set temperature and comparing it with the detected temperature of the second heat medium.
The hot water supply method according to any one of claims 1 to 3, wherein the hot water supply method comprises. A heat storage tank that stores the first heat medium that recovers heat from the heat source,
A first hot water supply unit that exchanges heat with water to supply hot water in the heat storage tank, and
A second hot water supply unit that discharges hot water flowing from the first hot water supply unit through a hot water supply channel at a hot water supply set temperature, and
A first temperature sensor that detects the temperature of the first heat medium stored in the upper layer side in the heat storage tank at the start of hot water supply or at the set timing.
A second temperature sensor that detects the temperature of the second heat medium in the second hot water supply unit, and
When the temperature of the first heat medium is equal to or higher than the first threshold value and the temperature of the second heat medium is lower than the second threshold value, the second hot water supply unit is operated to at least the second. The first warm-up mode for heating the heat medium is executed, and when the temperature of the first heat medium falls below the first threshold value, the second warm-up mode is performed in the second hot water supply unit. And the control unit that executes
A hot water supply system characterized by being equipped with. By executing the first warm-up mode, the control unit notifies the instruction information not to exchange heat between the second heat medium and the hot water in the second hot water supply unit, and burns the second hot water supply unit. The hot water supply system according to claim 6, wherein the second heat medium is heated until the temperature reaches the first set temperature. A heat exchange unit for heat exchange between the hot water and the second heat medium is provided.
By executing the second warm-up mode, the control unit burns the second hot water supply unit to heat the second heat medium until the temperature reaches the second set temperature, and the first hot water supply unit. The hot water supply system according to claim 6 or 7, wherein a part of the hot water flowing from the unit is allowed to flow to the heat exchange unit side to heat the inside of the heat exchange pipeline of the second hot water supply unit. .. A third temperature sensor that detects the temperature of the hot water that has flowed into the second hot water supply unit through the hot water supply passage, and a third temperature sensor.
A temperature control unit that adjusts the temperature of the hot water by mixing the hot water that has exchanged heat with the second heat medium in the heat exchange unit and the hot water that bypasses the heat exchange unit.
Equipped with
When the temperature of the hot water is lower than the set temperature of the hot water supply, the control unit burns the second hot water supply unit to heat the second heat medium, and switches the mixing ratio of the temperature adjustment unit. Hot water is discharged at the set temperature of hot water supply.
The hot water supply system according to any one of claims 6 to 8, wherein the hot water supply system is characterized in that. In the control unit, when the hot water before heat exchange is supplied to the heat exchange unit through the temperature adjusting unit and the temperature of the second heat medium is equal to or higher than the first set temperature, the second The hot water supply system according to claim 9, wherein the hot water supply unit is stopped from burning. A third temperature sensor that detects the temperature of the hot water that has flowed into the second hot water supply unit through the hot water supply passage, and a third temperature sensor.
A storage unit that stores a threshold database including the second threshold value registered in association with the hot water temperature and the hot water supply set temperature with respect to the temperature of the second heat medium.
Equipped with
The claim is characterized in that the control unit extracts the second threshold value from the threshold value database based on the detected hot water temperature and the hot water supply set temperature and compares it with the detected temperature of the second heat medium. The hot water supply system according to any one of claims 6 to 8. A program to run on a computer
A function to acquire the detected temperature of the first heat medium stored in the upper layer side in the heat storage tank of the first hot water supply unit at the start of hot water supply or at the setting timing, and
The function to acquire the detected temperature of the second heat medium in the second hot water supply unit, and
When the temperature of the first heat medium is equal to or higher than the first threshold value and the temperature of the second heat medium is lower than the second threshold value, the second hot water supply unit is operated to at least the second. The function to execute the first warm-up mode to heat the heat medium of
A function of causing the second hot water supply unit to execute the second warm-up mode when the temperature of the first heat medium falls below the first threshold value.
A program characterized by executing the above-mentioned computer. The first warm-up mode is
A function of notifying instruction information not to exchange heat between the second heat medium and the hot water in the second hot water supply unit, and
The function of burning the second hot water supply unit so as to heat the second heat medium until the first set temperature is reached, and
The program according to claim 12, wherein the program comprises. The second warm-up mode is
The function of burning the second hot water supply unit so as to heat the second heat medium until the second set temperature is reached, and
A function of flowing a part of the hot water flowing from the first hot water supply unit to the heat exchange unit side of the second hot water supply unit, and
12. The program according to claim 12 or 13. Further, a function of acquiring the detected temperature of the hot water flowing into the second hot water supply unit, and
When the temperature of the hot water is lower than the hot water supply set temperature, the function of burning the second hot water supply unit so as to heat the second heat medium and the function of burning the second hot water supply unit.
A function of switching the mixing means so that a part or all of the hot water flows into the heat exchange unit side and discharging hot water at the hot water supply set temperature by heat exchange with the second heat medium.
The program according to any one of claims 12 to 14, wherein the program comprises. Further, when the second hot water supply unit does not heat-treat the hot water, a function of reading the detected temperature of the hot water flowing into the second hot water supply unit is added.
A function to read the second threshold value from the threshold value database of the second heat medium stored in the storage unit, and
A function of extracting the second threshold value from the threshold value database based on the detected hot water temperature and the hot water supply set temperature and comparing it with the detected temperature of the second heat medium.
The program according to any one of claims 12 to 14, wherein the program comprises.

Images