JP2022152015A - Hot water storage and supply system - Google Patents

Abstract

To provide a hot water storage and supply system configured so as to prevent a situation in which hot water cannot be supplied by receiving power supply from a photovoltaic power generation and storage system to store hot water during power failure of a commercial power supply.SOLUTION: In a hot water storage and supply system including a heat pump type heat source machine for heating hot water with electric power supplied from a photovoltaic power generation and storage system and a commercial power supply, a combustion type heat source machine for heating hot water with combustion heat of a fuel, a hot water storage tank, and control means for controlling hot storage operation for storing the hot water heated by the heat pump type heat source machine in the hot water storage tank, the control means shifts to an independent mode for using electric power of the photovoltaic power generation and storage system when power failure of a commercial power supply is detected, and selects any one of first hot water storage operation for storing hot water with heat amount corresponding to a hot water supply use history, second hot water storage operation for storing hot water with a maximum heat amount of the hot water storage tank and third hot water storage operation for storing hot water with a heat amount smaller than the second hot water storage operation on the basis of an acquired fuel supply state, a power generation state of the photovoltaic power generation and storage system and fuel electric power information on a power storage amount.SELECTED DRAWING: Figure 4

Description

The present invention relates to a hot water storage and hot water supply system that uses hot water heated by a heat pump type heat source and stored in a hot water storage tank, and in particular to a self-sustaining operation by receiving power from a photovoltaic power storage system that stores power generated by photovoltaic power generation. The present invention relates to a hot water storage and hot water supply system that can be configured.

A photovoltaic power generation system that generates electricity using sunlight as a renewable energy source is widely used in general households. Electricity generated by solar power is used in the home, and surplus electricity that is not used is sold through a commercial power source. In addition, the use of photovoltaic power generation/storage systems that store surplus power in a power storage device and supply power from the power storage device when solar power cannot be generated or when a commercial power supply fails, for example, is becoming more widely used.

On the other hand, a storage hot water supply system is widely used in which high temperature hot water heated by an electric heat pump type heat source having high energy efficiency is stored in a hot water storage tank and the high temperature water in the hot water storage tank is used for hot water supply. In order to suppress wasteful power consumption when storing hot water, there is also known a hot water storage and hot water supply system that stores a predicted amount of heat based on the learned and stored hot water supply usage history before the predicted hot water supply use time. Such a hot water storage and hot water supply system is a combustion type heat source that heats hot water using combustion heat of fuel in order to prevent a situation in which the hot water in the hot water storage tank is exhausted and the hot water cannot be supplied due to the use of hot water exceeding the predicted amount of heat, for example. have the machine.

By the way, for example, when a commercial power supply fails due to the occurrence of a disaster, there is a possibility that the power supply of the commercial power supply will not be restored in a short period of time. In order to supply hot water even when the commercial power source fails, there is known a hot water storage and hot water supply system configured to be capable of independent operation, in which hot water is stored by a heat pump type heat source machine after being supplied with power from a photovoltaic power storage system. For example, in Patent Document 1, in the case of self-sustaining operation in which the stored power is used to heat hot water with a heat pump type heat source equipment during a power outage of the commercial power supply, it is possible to perform control to suppress power consumption according to the amount of stored electricity. Have been described.

Japanese Patent No. 6709691

When a commercial power supply fails due to a disaster, the fuel supply to the combustion heat source machine is cut off, and the combustion heat source machine may not be able to be used. At this time, it is demanded to give priority to preventing a situation in which hot water cannot be supplied rather than suppressing power consumption in self-sustained operation. However, there is no hot water storage and hot water supply system configured to adjust the amount of heat to be stored in the hot water storage tank in order to prioritize the prevention of hot water supply failure when the commercial power supply fails. Moreover, Patent Document 1 is intended to store hot water while suppressing power consumption or to prohibit hot water storage based on the amount of electricity stored, and does not describe adjustment of the amount of heat stored in the hot water storage tank.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot water storage and hot water supply system configured to receive electric power from a photovoltaic power storage system and store hot water in the event of a power failure of a commercial power supply, thereby preventing a situation in which hot water cannot be supplied.

The hot water storage and hot water supply system of the invention of claim 1 comprises a photovoltaic power generation storage system that generates and stores electricity with sunlight, a heat pump type heat source that heats hot water using electric power supplied from a commercial power supply, and combustion heat of fuel. and a hot water storage tank, and control means, wherein the control means controls a hot water storage operation in which hot water heated by the heat pump type heat source machine is stored in the hot water storage tank. In the hot water storage and hot water supply system, when a power outage of the commercial power supply is detected, the control means shifts to a self-sustaining mode in which power supplied from the photovoltaic power storage system is used, and the fuel supply state of the combustion heat source machine and the A first hot water storage operation of acquiring fuel power information on the power generation state and the amount of stored power of a photovoltaic power generation storage system, storing a heat amount according to the hot water supply usage history based on the fuel power information, and storing the maximum heat amount of the hot water storage tank. It is characterized by selecting and controlling either one of a second hot water storage operation for storing hot water and a third hot water storage operation for storing a smaller amount of hot water than the second hot water storage operation.

According to the above configuration, the hot water storage and hot water supply system selects and controls any one of the first to third hot water storage operations based on the acquired fuel electric power information in the self-sustained mode when the commercial power supply fails. In the self-sustaining mode, any one of the first to third hot water storage operations is selected and stored by receiving electric power from the photovoltaic power storage system. situation can be prevented.

According to a second aspect of the invention, there is provided a hot-water storage and hot-water supply system according to the first aspect of the invention, wherein the control means controls, based on the fuel electric power information, whether the stored electricity amount is equal to or greater than a preset reference value and the fuel supply state is capable of supplying fuel or the power generation state is non-power generation, the first hot water storage operation is selected.
According to the above configuration, when the stored electricity amount is equal to or higher than the reference value and there is a margin, and the combustion heat source device can be used in a state where fuel can be supplied, the heat amount according to the hot water supply usage history is stored in the first hot water storage operation. store water. Since there is a margin in the amount of electricity stored and fuel can be used, the amount of heat predicted to be required for hot water supply is stored in the first hot water storage operation, and excessive use of the electricity stored in the solar power generation storage system is suppressed. be able to. In addition, even if the amount of stored electricity is equal to or higher than the reference value and there is a margin and power cannot be generated, the first hot water storage operation is selected to suppress unnecessary use of the electricity stored in the photovoltaic power generation storage system. can be done.

According to a third aspect of the present invention, there is provided a hot water storage and hot water supply system according to the first or second aspect of the present invention, wherein the control means controls, based on the fuel electric power information, that the stored electricity amount is equal to or greater than a preset reference value, and that the fuel The second hot water storage operation is selected when the supply state is a state in which fuel cannot be supplied and the power generation state is during power generation.
According to the above configuration, when the storage amount is equal to or higher than the reference value and there is a margin, and the combustion heat source device cannot be used in a state where fuel cannot be supplied, but the solar power generation storage system is generating power, the second The maximum amount of heat that can be stored in the hot water storage tank is stored during the hot water storage operation. Even if the amount of hot water used exceeds the amount of heat predicted based on the hot water usage history, the maximum amount of heat is stored in the hot water storage tank to ensure the maximum amount of hot water that can be supplied. can be prevented.

According to a fourth aspect of the present invention, there is provided a hot water storage and hot water supply system according to any one of the first to third aspects of the invention, wherein, based on the fuel electric power information, the stored electricity amount is less than a preset reference value. In some cases, the third hot water storage operation is selected.
According to the above configuration, when the amount of stored electricity is less than the reference value and there is no margin, the amount of heat less than the maximum amount of heat of the hot water storage tank is stored in the third hot water storage operation. Since there is no margin in the amount of electricity stored, hot water is stored in the hot water storage tank while taking into consideration power distribution to other household appliances, and hot water can be supplied immediately, regardless of the fuel supply status. Impossibility can be prevented.

According to the hot water storage and hot water supply system of the present invention, it is possible to receive electric power from the photovoltaic power storage system and store hot water in the event of a power failure of the commercial power supply, thereby preventing a situation in which hot water cannot be supplied.

1 is an explanatory diagram of a peripheral configuration of a hot water storage and hot water supply system according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the hot water storage hot-water supply system which concerns on an Example. It is an explanatory view of a heat pump type heat source machine. 4 is a flow chart of hot water storage control according to the embodiment. 4 is a hot water storage operation table during self-sustained operation according to the embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on an Example.

First, the peripheral configuration of the hot water storage and hot water supply system 1 will be described with reference to FIG.
The hot water storage and hot water supply system 1 is connected to a power switching unit 4 so as to be supplied with power from a commercial power source 2 and a photovoltaic power storage system 3 . The power switching unit 4 has the function of a general distribution board connected to the commercial power source 2 and the function of switching the power received by the hot water storage and hot water supply system 1 to the power of the commercial power source 2 or the power of the photovoltaic power storage system 3. .

The photovoltaic power generation and storage system 3 includes a solar cell panel 5 that generates power using sunlight, a power storage device 6 that stores the generated power, and a power switch that converts the generated power and stored power from direct current to alternating current. It has a power conditioner 7 that feeds the unit 4 . The power generated by the solar cell panel 5 is preferentially used in the home, and unused surplus power is stored in the power storage device 6 . When the power storage device 6 cannot store the surplus power, the surplus power is sold through the commercial power supply 2 .

The hot water storage and hot water supply system 1 has a heat pump type heat source device 10 and a hot water storage and hot water supply unit 20, and is driven by using the electric power of the solar power generation and storage system 3 and the electric power of the commercial power supply 2 individually or in combination. be. Electric power supplied to the hot water storage and hot water supply system 1 is supplied to the hot water storage and hot water supply unit 20 via the power line 8a, and is supplied from the hot water storage and hot water supply unit 20 to the heat pump type heat source device 10 via the power supply line 8b.

The hot water storage and hot water supply system 1 will be described based on FIG.
The hot water storage and hot water supply unit 20 includes a hot water storage tank 21 for storing hot water, a combustion heat source device 22 for heating the hot water using combustion heat of fuel, a mixing valve 23 for mixing high temperature hot water and tap water, A controller 24 (control means) for controlling the hot water storage system 1 is provided. The hot water storage and hot water supply system 1 stores high-temperature hot water in the hot water storage tank 21 by heating the hot water in the hot water storage tank 21 using the heat of the outside air by the heat pump type heat source device 10, and mixes the high temperature hot water in the hot water storage tank 21 with tap water. It is configured to mix hot water at a hot water supply set temperature with a valve 23 and supply hot water to, for example, a hot water tap 9 .

The combustion type heat source device 22 includes a blower fan 22a, a burner 22b, a heat exchanger 22c, and the like, and heats tap water using combustion heat of fuel (for example, city gas) supplied from the outside. The control unit 24 predicts the future use of hot water supply based on the hot water supply use history that has been learned and stored, and performs hot water storage operation so that hot water is stored in the hot water storage tank 21 before the predicted use of hot water supply corresponding to the predicted amount of hot water supply. to control.

A circulation path 25 for supplying hot water from the hot water storage tank 21 to the heat pump type heat source device 10 is connected to the lower part of the hot water storage tank 21. A circulation return passage 26 is connected to return to 21 . The circulation forward passage 25 includes a hot water storage pump 27 for sending hot water in the hot water storage tank 21 to the heat pump type heat source device 10 . Note that the heat pump type heat source device 10 may include a hot water storage pump 27 .

A circulation going temperature sensor 25 a for detecting the temperature of hot water supplied to the heat pump type heat source device 10 is arranged in the circulation going passage 25 . A circulation return temperature sensor 26a for detecting the temperature of hot water heated by the heat pump type heat source device 10 is arranged in the circulation return passage 26 .

A water supply passage 28 for supplying clean water to the hot water storage tank 21 is connected to the lower portion of the hot water storage tank 21 . A water supply temperature sensor 28a for detecting the temperature of tap water is provided in the water supply passage 28, and a water discharge passage 29 having a drain plug 29a is connected near the connection of the water supply passage 28 with the hot water storage tank 21. there is The drain plug 29a is also used to take out hot water from the hot water storage tank 21 when the water supply is cut off. A hot water outlet passage 30 is connected to the upper portion (top) of the hot water storage tank 21 for discharging hot water from the hot water storage tank 21 by the supply pressure of tap water.

A plurality of stored hot water temperature sensors 21a to 21e are arranged in the hot water storage tank 21 so as to be arranged at predetermined intervals in the height direction of the hot water storage tank 21 in order to detect the temperature of the hot water therein. . A hot water tank outlet hot water temperature sensor 21f for detecting the temperature of the hot water discharged from the hot water tank 21 to the hot water outlet passage 30 is arranged near the connecting portion of the hot water outlet passage 30 with the hot water tank 21 . The hot water storage tank 21, including the hot water storage temperature sensors 21a to 21e and the hot water storage tank outlet hot water temperature sensor 21f, is covered with a heat insulating member (not shown) to prevent the hot water stored in the hot water storage operation from radiating heat and moderate the temperature drop. .

The mixing valve 23 is connected to a first branch passage 31 branched from the water supply passage 28 , a hot water outlet passage 30 and a hot water supply passage 32 . The mixing valve 23 is configured to be able to adjust the mixing ratio of the high-temperature hot water supplied from the hot water supply passage 30 and the low-temperature clean water supplied from the first branch passage 31 . The hot water mixed by the mixing valve 23 is supplied to the hot water supply passage 32 and supplied from the hot water tap 9 or the like.

A mixing valve inlet temperature sensor 30 a for detecting the temperature of the hot water supplied to the mixing valve 23 is arranged in the hot water outlet passage 30 near the high-temperature water inlet of the mixing valve 23 . The hot water supply passage 32 is provided with a hot water supply flow rate sensor 32a for detecting the hot water supply flow rate, a hot water supply temperature sensor 32b for detecting the hot water supply temperature, and a hot water supply flow rate adjustment valve 32c for adjusting the hot water supply flow rate.

A second branch passage 33 is further branched from the water supply passage 28, and the second branch passage 33 is connected to the reheating circulation passage 34 so that clean water can be supplied from the water supply passage 28 to the reheating circulation passage 34. It is The reheating circulation passage 34 is connected to the combustion heat source device 22 and the reheating heat exchanger 35 , and a circulation pump is connected to the hot water inlet side of the combustion heat source device 22 to supply hot water to the combustion heat source device 22 . 36.

Between the outlet of the circulation pump 36 of the reheating circulation passage 34 and the inlet of the combustion heat source device 22, a combustion heat source device inlet temperature sensor 34a for detecting the temperature of hot water supplied to the combustion heat source device 22; A circulation flow rate sensor 34b is provided to detect the flow rate. A combustion type heat source device outlet temperature sensor 34c for detecting the temperature of hot water heated by the combustion type heat source device 22 is arranged in the reheating circulation passage 34 on the hot water outlet side of the combustion type heat source device 22. Further, the reheating circulation passage 34 has an opening/closing electromagnetic valve 34 d for opening and closing the reheating circulation passage 34 on the outlet side of the reheating heat exchanger 35 . The second branch passage 33 is connected between the circulation pump 36 and the opening/closing electromagnetic valve 34d.

The reheating heat exchanger 35 is connected to a reheating passage 38 having a bathtub pump 37 for circulating hot water in a bathtub (not shown). The reheating heat exchanger 35 heats hot water in the bathtub flowing through the reheating passage 38 by exchanging heat with the hot water heated by the combustion heat source device 22 . The reheating passage 38 is connected to a hot water pouring passage 39 branched from the hot water supply passage 32 at the hot water supply flow rate adjustment valve 32c so that hot water can be poured (filled) into the bathtub through the reheating passage 38. there is

A combustion hot water discharge passage 40 is branched from the reheating circulation passage 34 between the combustion type heat source unit outlet temperature sensor 34 c and the reheating heat exchanger 35 and connected to the hot water discharge passage 30 . The hot water discharge passage 40 is provided with a flow control valve 40 a for adjusting the amount of hot water supplied to the hot water discharge passage 30 . The hot water heated by the combustion heat source device 22 can be supplied to the hot water discharge passage 30 via the combustion hot water discharge passage 40 .

The control unit 24 controls devices such as valves and pumps installed in each part based on the temperature detected by temperature sensors such as the hot water storage temperature sensor 21a and the flow rate detected by the hot water supply flow sensor 32a. It is operated to perform various operational controls. In addition, the control unit 24 has a timekeeping function and a function of learning and storing hot water supply usage history. An operation terminal 24a is communicably connected to the control unit 24 . The operation terminal 24a has an operation unit and a display unit for operation of the hot water storage and hot water supply system 1 and various setting operations such as hot water supply set temperature, and a communication unit for communication connection to a domestic communication network (home network). . The home network receives power from the photovoltaic power generation and storage system 3 and maintains communication capability even when the commercial power source 2 fails.

The heat pump heat source device 10 will be described with reference to FIG. 3 .
The heat pump type heat source device 10 is configured by connecting a compressor 11 , a condensing heat exchanger 12 , an expansion valve 13 , and an evaporating heat exchanger 14 with a refrigerant circuit 15 . The heat pump type heat source device 10 compresses the refrigerant enclosed in the refrigerant circuit 15 with the compressor 11 and raises it to a high temperature. The hot water in the hot water storage tank 21 supplied from the circulation passage 25 by driving the hot water storage pump 27 is heated by heat exchange with the high-temperature refrigerant in the condensation heat exchanger 12 . The refrigerant, whose temperature has decreased after heat exchange, expands in the expansion valve 13 to become lower in temperature than the outside air, absorbs heat from the outside air in the evaporative heat exchanger 14, and is introduced into the compressor 11 again. The evaporative heat exchanger 14 includes a blower 16 and an outside air temperature sensor 17 that detects the outside air temperature.

Next, the hot water storage operation will be described.
The control unit 24 predicts future hot water supply time and hot water consumption based on the hot water supply usage history learned and stored, for example, and controls the hot water storage operation so that hot water storage is completed immediately before the predicted hot water supply usage. At this time, the controller 24 operates the hot water storage pump 27 and the heat pump type heat source device 10 to start the hot water storage operation, and ends the hot water storage operation when the amount of heat corresponding to the predicted amount of hot water to be supplied is stored.

Next, the hot water supply operation will be explained.
In the hot water supply operation in which hot water is supplied at the hot water supply set temperature, the control unit 24 adjusts the mixture ratio of the mixing valve 23 based on the temperatures detected by the mixing valve inlet temperature sensor 30a, the water supply temperature sensor 28a, and the hot water supply temperature sensor 32b. Hot water adjusted to the set temperature of hot water supply is supplied by this. At this time, the controller 24 performs the hot water supply operation using the hot water stored in the hot water storage tank 21 by the hot water storage operation. In the hot water supply operation, the control unit 24 controls, for example, the hot water supply time (hot water supply usage time), the hot water supply flow rate detected by the hot water supply flow rate sensor 32a, the hot water supply usage time, the hot water supply flow rate, and the mixing ratio of the mixing valve 23. It learns and stores the history of hot water supply usage, including the amount of hot water supplied.

For example, when the hot water stored in the hot water supply is used up during the hot water supply operation and there is no hot water of a temperature that can be used for hot water supply in the hot water storage tank 21, the control unit 24 drives the circulation pump 36 to supply water from the water supply passage 28. A hot water supply operation is performed using high-temperature hot water obtained by heating tap water with a combustion type heat source device 22.例文帳に追加Further, for example, when hot water having a higher temperature than the stored hot water is supplied by changing the hot water supply set temperature, the control unit 24 heats the clean water supplied from the water supply passage 28 by the combustion heat source device 22. Hot water supply operation is performed using hot water.

In addition to the hot water storage operation and hot water supply operation, the control unit 24 stores a control program for controlling hot water filling operation, reheating operation, etc. based on detection signals from various sensors. Further, the control unit 24 controls the heat pump heat source device 10 based on the temperature of water entering the heat pump heat source device 10 and the outside air temperature.

The hot water storage and hot water supply system 1 normally receives power from one or both of the photovoltaic power generation/storage system 3 and the commercial power supply 2, and performs normal mode hot water storage operation and hot water supply operation. However, there is a possibility that the commercial power supply 2 will be cut off due to the occurrence of a disaster such as a typhoon or an earthquake. Therefore, the hot water storage and hot water supply system 1 has a self-sustaining mode in which the hot water storage operation and the hot water supply operation are performed by receiving electric power from the photovoltaic power storage system 3 when the commercial power supply 2 fails.

In the normal mode, the amount of heat predicted based on the hot water supply usage history is stored in the hot water storage tank 21 by the heat pump type heat source device 10 . The hot water stored in the hot water storage tank 21 is used for hot water supply. When the hot water in the hot water storage tank 21 cannot be used for hot water supply, tap water is heated by the combustion type heat source machine 22 to supply hot water.

On the other hand, in the self-sustaining mode, the heat pump type heat source device 10 performs hot water storage operation using power supplied from the photovoltaic power generation storage system 3, and stores hot water for hot water supply. At this time, the power outage due to the disaster may not be restored in a short period of time, and the supply of fuel used by the combustion heat source equipment 22 may be interrupted. In such a situation, in order to supply electric power to domestic devices and secure hot water for hot water supply, the control unit 24 controls the hot water storage operation according to the power generation status and power storage status of the photovoltaic power generation and storage system 3. conduct. Hot water storage control by the controller 24 of this hot water storage and hot water supply system 1 will be described based on the hot water storage control flowchart of FIG. Si (i=1, 2, . . . ) in the figure represents steps.

When the hot water storage control is started, in S1, future hot water supply is predicted based on the hot water supply usage history learned and stored, and the process proceeds to S2. This prediction includes prediction of hot water supply consumption and prediction of hot water supply use time.

In S2, it is determined whether the hot water storage timing has arrived. For example, it is determined whether or not it is time to start storing hot water so that the amount of heat corresponding to the amount of hot water to be used will be completed before the hot water supply use time predicted in S1. If the determination in S2 is Yes, the process proceeds to S3, and if the determination in S2 is No, the determination in S2 is repeated.

In S3, it is determined whether or not the commercial power supply 2 has failed. The power supply status of the commercial power source 2 is acquired by communication with the power switching unit 4 via the home network. Communication among the control unit 24, the power switching unit 4, and the solar power generation/storage system 3 is performed via a home network based on a communication standard called ECHONET Lite (registered trademark), for example. If the determination in S3 is No (if the commercial power supply 2 is supplying power), the process proceeds to S4, in which the hot water storage operation in the normal mode is performed, and the process returns. If the determination in S3 is Yes (in the case of power failure detection of the commercial power supply 2), the process proceeds to S5.

In S5, it shifts to the self-sustaining mode in which it operates by receiving power supply from the photovoltaic power generation and storage system 3, and proceeds to S6. Then, in S6, the fuel electric power information is acquired and the process proceeds to S7. The fuel power information includes the fuel supply state (whether fuel can be supplied), the power generation state of the solar power generation and storage system 3 by sunlight, and the amount of electricity stored. The solar power generation state and the power storage state are acquired through communication with the photovoltaic power generation and storage system 3 . The fuel supply state is checked by performing an ignition operation in the combustion type heat source device 22 and making a trial whether or not the fuel is actually combustible.

In S7, it is determined whether or not the acquired amount of stored electricity is equal to or greater than a preset reference value. This is because the stored electric power is also distributed to other devices in the home, so it is preferable to adjust the amount of heat to be stored according to the amount of stored electricity. If the determination in S7 is Yes (if the value is greater than or equal to the reference value), the process proceeds to S8.

In S8, it is determined whether or not fuel can be supplied based on the acquired fuel electric power information. If the determination in S8 is Yes (if fuel can be supplied), the process proceeds to S9, in which the first hot water storage operation is selected and executed. In this first hot water storage operation, hot water is stored in an amount of heat corresponding to the amount of hot water supply predicted based on the hot water supply usage history in S1. Since there is a sufficient amount of stored electricity equal to or greater than the reference value, it is possible to store the predicted amount of heat by receiving electric power from the photovoltaic power generation storage system 3, and since it is possible to supply fuel, the combustion type heat source device 22 can be used to supply hot water. Impossible situations can be prevented. After the first hot water storage operation is executed and the hot water storage is completed, the process proceeds to S10, in which the normal mode is entered and the return is performed.

If the determination in S8 is No (if fuel cannot be supplied), the process proceeds to S11. Then, in S11, it is determined whether power is being generated by photovoltaic power generation based on the acquired fuel power information. If the determination in S11 is Yes (when power is being generated), the process proceeds to S12, in which the second hot water storage operation is selected and executed. In the second hot water storage operation, the maximum amount of heat that can be stored in the hot water storage tank 21 is stored instead of the amount of heat predicted based on the hot water supply usage history. In this second hot water storage operation, the combustion type heat source device 22 cannot be used due to the inability to supply fuel. This is to ensure the maximum amount of hot water for hot water supply.

If the determination in S11 is No (in the case of non-power generation), the process proceeds to S9 to select and execute the first hot water storage operation. In the first hot water storage operation, the amount of heat predicted based on the hot water supply usage history is stored, so it is possible to store the required amount of heat and suppress unnecessary power consumption. Although the combustion type heat source device 22 cannot be used due to the inability to supply fuel, the amount of heat corresponding to at least the predicted amount of hot water supply is stored in a state in which the amount of stored electricity is equal to or greater than the reference value and there is a margin, and normal hot water supply is used. To prevent hot water supply from becoming impossible within the range of the amount.

On the other hand, if the determination in S7 is No (if it is less than the reference value), the process proceeds to S13. Then, in S13, the third hot water storage operation is selected and executed. In the third hot water storage operation, hot water can be stored in the hot water storage tank 21 of the second hot water storage operation in order to distribute and use a small amount of stored electricity, which is less than the reference value, with other devices in the home, instead of the amount of heat predicted based on the hot water supply usage history. It is a hot water storage operation that stores hot water with a lower calorie than the maximum calorie. The target amount of heat for the third hot water storage operation may be, for example, a preset amount of heat that is half the maximum amount of heat, or a heat amount that can be stored using half the amount of stored electricity as a heat amount corresponding to the amount of stored electricity. As a result, it is possible to ensure high-temperature hot water for hot water supply in consideration of power distribution in a state where there is no margin due to a small amount of stored electricity.

After execution of the second hot water storage operation in S12 and after execution of the third hot water storage operation in S13, the process proceeds to S14, in which it is determined whether or not the power failure of the commercial power supply 2 continues. If the determination in S14 is No (in the case of commercial power supply restoration), the process proceeds to S10, and if the determination in S14 is Yes (in the case of continuation of power failure), the process proceeds to S15.

In S15, it is determined whether the hot water storage timing has arrived. For example, when the amount of heat used for hot water supply exceeds a predetermined ratio of the amount of heat stored, or when the elapsed time after hot water storage exceeds a predetermined time, it is determined that the hot water storage timing has arrived. If the determination in S15 is Yes, the process returns to S6 to store hot water in the independent mode. If the determination in S15 is No, the process returns to S14, and the determinations in S14 and S15 are repeated until the commercial power source 2 is restored or the hot water storage timing arrives.

FIG. 5 is a hot water storage operation table showing the hot water storage operation to be selected based on the state of the commercial power supply 2, the state of fuel supply, the state of photovoltaic power generation, and the amount of electricity stored. The controller 24 can also store this hot water storage operation table and select and execute the first to third hot water storage operations based on the state of the commercial power source 2 and the acquired fuel electric power information.

The operation and effects of the hot water storage and hot water supply system 1 will be described.
The hot water storage and hot water supply system 1 selects and controls any one of the first to third hot water storage operations based on the obtained fuel electric power information in the self-sustained mode when the commercial power source 2 fails. In the self-sustaining mode, any one of the first to third hot water storage operations is selected and hot water is stored by receiving power supply from the photovoltaic power storage system 3, so the stored hot water can be used for hot water supply, and hot water supply is disabled. situation can be prevented. In addition, since the hot water storage and hot water supply system 1 automatically selects any one of the first to third hot water storage operations based on the fuel/electricity information, the user is required to store hot water based on the fuel supply state and the power supply state. There is no burden on the user.

In the self-sustaining mode, when the stored electricity amount is equal to or higher than the reference value and there is a margin, and when the combustion heat source device 22 can be used in a state where fuel can be supplied, the heat amount corresponding to the hot water supply usage history is stored in the first hot water storage operation. do. Since there is a margin in the amount of electricity stored and the fuel can be used, the amount of heat predicted to be required for hot water supply is stored in the first hot water storage operation, and excessive use of the electric power stored in the photovoltaic power storage system 3 is suppressed. can be done.

In addition, in the self-sustaining mode, when the amount of stored electricity is equal to or higher than the reference value and there is a margin, and the combustion heat source device 22 cannot be used in a state where fuel cannot be supplied, the solar power generation storage system 3 is generating power. , the maximum amount of heat that can be stored in the hot water storage tank 21 is stored in the second hot water storage operation. Since there is a possibility that the hot water cannot be supplied because the fuel cannot be used, the hot water supply can be prevented by storing the maximum amount of heat stored in the hot water storage tank 21 and securing the maximum amount of hot water that can be supplied.

On the other hand, when the amount of stored electricity is less than the reference value in the self-sustaining mode and there is no margin, the amount of heat less than the maximum amount of heat of the hot water storage tank 21 is stored in the third hot water storage operation. Since there is no margin in the amount of electricity stored, hot water is stored in the hot water storage tank 21 while considering power distribution to other devices in the home, and high temperature hot water that can be supplied is secured, so that a certain amount of hot water is supplied regardless of the fuel supply state It is possible to prevent the hot water supply from becoming impossible.

The combustion type heat source device 22 may be configured to reheat the hot water in the hot water storage tank 21 and supply the hot water to the hot water discharge passage 30 . In addition, those skilled in the art can implement various modifications to the above-described embodiments without departing from the scope of the present invention, and the present invention includes such modifications.

1: hot water storage system 2: commercial power source 3: photovoltaic power storage system 4: power switching unit 5: solar cell panel 6: power storage device 7: power conditioner 8a, 8b: power supply line 9: hot water tap 10: heat pump type heat source Machine 11: Compressor 12: Condensing heat exchanger 13: Expansion valve 14: Evaporative heat exchanger 15: Refrigerant passage 20: Hot water storage and hot water supply unit 21: Hot water storage tank 22: Combustion heat source device 22a: Blower fan 22b: Burner 22c: Heat Exchanger 23 : Mixing valve 24 : Control unit 25 : Circulation forward passage 26 : Circulation return passage 27 : Hot water storage pump 28 : Water supply passage 29 : Drainage passage 30 : Hot water outlet passage 31 : First branch passage 32 : Hot water supply passage 33 : Second Branch passage 34 : Reheating circulation passage 35 : Reheating heat exchanger 36 : Circulation pump 37 : Bathtub pump 38 : Reheating passage 39 : Hot water pouring passage 40 : Combustion hot water passage

Claims (4)

A photovoltaic energy storage system that generates and stores electricity from sunlight, a heat pump type heat source that heats hot water using electricity supplied from a commercial power supply, and a combustion type heat source that heats hot water using the combustion heat of fuel. A hot water storage and hot water supply system comprising a machine, a hot water storage tank, and control means, wherein the control means controls a hot water storage operation in which hot water heated by the heat pump type heat source machine is stored in the hot water tank,
When a power outage of the commercial power source is detected, the control means shifts to a self-sustaining mode using power supplied from the photovoltaic power storage system, and controls the fuel supply state of the combustion heat source machine and the photovoltaic power storage system. A first hot water storage operation for storing a heat amount corresponding to the hot water supply usage history and a second hot water storage operation for storing the maximum heat amount of the hot water storage tank based on the fuel power information regarding the power generation state and the amount of stored electricity. and a third hot water storage operation in which a smaller amount of hot water is stored than in the second hot water storage operation. The control means, based on the fuel power information, when the stored electricity amount is equal to or greater than a preset reference value and the fuel supply state is a state in which fuel can be supplied or the power generation state is non-power generation, 2. The hot water storage system according to claim 1, wherein the first hot water storage operation is selected. The control means, based on the fuel power information, when the stored electricity amount is equal to or greater than a preset reference value, the fuel supply state is a state in which fuel cannot be supplied, and the power generation state is a power generation state, 3. The hot water storage and hot water supply system according to claim 1, wherein the second hot water storage operation is selected. 4. The control means according to any one of claims 1 to 3, wherein the control means selects the third hot water storage operation when the stored electricity amount is less than a preset reference value based on the fuel electric power information. The hot water storage hot water supply system according to item 1.

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