JP7331663B2 - Storage hot water heater - Google Patents

Description

The present invention relates to a hot water storage type hot water supply apparatus.

Patent Document 1 below discloses a hot water storage type hot water supply apparatus having power switching determination means for determining whether hot water is to be stored using daytime power or late-night power generated by solar power generation means. There is disclosed a technique for generating hot water by operating a hot water storage type hot water supply means using power from a photovoltaic power generation means instead of late-night power when weather forecast information acquired by an acquisition means matches preset weather information. there is

Japanese Unexamined Patent Application Publication No. 2008-2702

In the technique of Patent Document 1, when the weather forecast information does not match the preset weather information, the electric power of the photovoltaic power generation means is not used, and the late-night electric power is used to operate the hot water storage type hot water supply means. Therefore, the power of the photovoltaic power generation means cannot always be effectively used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and more effectively executes a daytime heating operation using power generated by a solar power generation device in the daytime with a simple configuration. It is an object of the present invention to provide a hot water storage type hot water supply apparatus capable of

A hot water storage type hot water supply apparatus according to the present invention includes a hot water storage tank, a heating means for consuming electric power to heat water, and a control means for controlling a boiling operation for heating the water in the hot water storage tank by the heating means, As the heating operation, it is possible to perform a nighttime heating operation using power supplied from a commercial power supply at night and a daytime heating operation using power generated by the solar power generation device during the daytime, The control means can receive information input by the user to the information input device, and the information input device receives power generation capacity information, which is information on the power generation capacity of the photovoltaic power generation device, and information on the location of the photovoltaic power generation device. The control means uses the power generation capacity information, the location information, and the weather forecast information for the next day to determine the power generated by the photovoltaic power generation device on the next day. The amount of photovoltaic power generation is predicted, and the control means predicts that when the predicted amount of photovoltaic power generation on the next day is large, compared to when the predicted amount of photovoltaic power generation on the next day is small, It is not connected to an energy management device that controls electric appliances in the home so as to reduce the power consumption of the heating operation.

According to the present invention, it is possible to provide a hot water storage type hot water supply apparatus that can more effectively perform daytime heating operation using electric power generated by a solar power generation apparatus in the daytime with a simple configuration. becomes.

1 is a diagram showing a hot water storage type hot water supply apparatus according to Embodiment 1. FIG. FIG. 10 is a diagram showing a hot water storage type hot water supply apparatus of a comparative example;

Embodiments will be described below with reference to the drawings. Elements that are common or correspond to each figure are denoted by the same reference numerals, and common descriptions are simplified or omitted. In the following description, the term "water" basically means liquid water, and can include low temperature water to high temperature water.

Embodiment 1.
FIG. 1 is a diagram showing a hot water storage type hot water supply apparatus according to Embodiment 1. FIG. As shown in FIG. 1 , the hot water storage type hot water supply apparatus of the present embodiment includes a heat pump unit 6 and a tank unit 18 . The heat pump unit 6 corresponds to heating means that consumes electric power to heat water. The heat pump unit 6 heats water by operating a heat pump cycle. The heat pump unit 6 includes a compressor 1 , a water-refrigerant heat exchanger 2 , an expansion valve 3 , an air heat exchanger 4 , and refrigerant circulation pipes 5 . The water is heated by exchanging heat between the water and the refrigerant heated by the compressor 1 in the water-refrigerant heat exchanger 2 . The refrigerant that has passed through the water-refrigerant heat exchanger 2 is decompressed by the expansion valve 3 and becomes two-phase gas-liquid. The gas-liquid two-phase refrigerant absorbs the heat of the outside air while passing through the air heat exchanger 4 and evaporates, and then is sucked into the compressor 1 . The heating capacity of the heat pump unit 6 is the amount of heat given to water per unit time, and the unit is watt. The heating capacity of the heat pump unit 6 may be adjustable. For example, by changing the rotation speed of the compressor 1 to change the heating capacity of the heat pump unit 6, the power consumption of the heat pump unit 6 can be adjusted.

A hot water storage tank 10 for storing hot water, a circulation pump 11 and a switching valve 12 are installed in the tank unit 18 . The heat pump unit 6 and the tank unit 18 are connected via the heat pump outgoing pipe 13, the heat pump return pipe 14, and electrical wiring (not shown). The heat pump outgoing pipe 13 connects the lower part of the hot water storage tank 10 and the water inlet of the water-refrigerant heat exchanger 2 . A circulation pump 11 is connected in the middle of the heat pump outgoing pipe 13 . The switching valve 12 has an A port as an inlet, a B port as a first outlet, and a C port as a second outlet. The heat pump return pipe 14 connects between the hot water outlet of the water-refrigerant heat exchanger 2 and the A port of the switching valve 12 . The B port of the switching valve 12 is connected to the upper portion of the hot water storage tank 10 via a hot water storage pipe 15 . A C port of the switching valve 12 is connected to the lower portion of the hot water storage tank 10 via a bypass pipe 16 .

A water supply pipe (not shown) is further connected to the lower portion of the hot water storage tank 10 . Water supplied from an external water source such as a tap flows into the hot water storage tank 10 through the water supply pipe and is stored therein. In the hot water storage tank 10, temperature stratification can be formed in which the upper side has a higher temperature and the lower side has a lower temperature due to the difference in water density due to temperature. A pipe for supplying hot water from the hot water storage tank 10 to a hot water destination such as a faucet, a shower, a bathtub, etc., and a mixing valve are further provided in the tank unit 18, but are not shown. When hot water is supplied from the hot water storage tank 10, the water from the water supply pipe flows into the lower part of the hot water storage tank 10, so that the inside of the hot water storage tank 10 is always kept full.

The hot water storage type hot water supply apparatus of the present embodiment includes a control unit 17 as control means. The control unit 17 is electrically connected to each component included in the hot water storage type hot water supply apparatus, and controls the operation of the hot water storage type hot water supply apparatus. The control unit 17 may include, for example, at least one memory and at least one processor. In the illustrated example, the controller 17 is installed inside the tank unit 18 , but the controller 17 may be installed inside the heat pump unit 6 . In addition, the operation of the hot water storage type hot water supply apparatus may be controlled not only by the single control unit 17 but also by a plurality of control devices arranged at different locations cooperating through communication.

A hot water storage type hot water supply apparatus can perform a boiling operation. The boiling operation is an operation in which the heat pump unit 6 heats the water in the hot water storage tank 10 . During the boiling operation, the operation is as follows. Heat pump unit 6 and circulation pump 11 are operated. Low-temperature water in the lower part of the hot water storage tank 10 flows into the water-refrigerant heat exchanger 2 through the heat pump outgoing pipe 13 . The low-temperature water is heated in the water-refrigerant heat exchanger 2 to become hot water, ie, high-temperature water. This high-temperature water flows into the upper part of the hot water storage tank 10 through the heat pump return pipe 14 , the switching valve 12 , and the hot water storage pipe 15 . Hot water is gradually stored from top to bottom in the hot water storage tank 10.例文帳に追加

A plurality of hot water temperature sensors (not shown) for detecting the amount of hot water and heat stored in the hot water tank 10 are installed in the hot water tank 10 . A hot water supply temperature sensor, a hot water supply flow rate sensor, and the like (not shown) for detecting the amount of heat used for hot water supply are installed in the piping within the tank unit 18 . The control unit 17 controls the amount of heat stored in the hot water storage tank 10 by the boiling operation according to the information detected by those sensors. For example, the control unit 17 may control the amount of heat stored in the hot water storage tank 10 according to a learning result obtained by statistically processing the amount of heat used for hot water supply during a past predetermined period (for example, the past two weeks).

Two-way communication is possible between the control unit 17 and the remote controller 20 by wired communication or wireless communication. Control unit 17 and remote control 20 may be able to communicate via a network. Remote control 20 is an example of a user interface. The remote controller 20 has a display section that displays information and an operation section that is operated by a user. The remote controller 20 may have a touch screen that functions as both a display and an operation unit. By operating the remote control 20, a person such as a user can remotely control the hot water storage type hot water supply apparatus and perform various settings. The display section of the remote controller 20 has a function as a notification means for notifying information to people such as the user. The remote control 20 may be installed, for example, on the wall of the kitchen, living room, bathroom, or the like.

The control unit 17 receives outputs from various sensors included in the hot water storage type hot water supply apparatus, information on user's operation contents of the remote controller 20, and the like. The controller 17 controls the operations of the heat pump unit 6 and the tank unit 18 based on these pieces of input information.

The control unit 17 is communicably connected to the broadband router 33 . The information input device 35 can communicate with the control section 17 via the Internet line 34 and the broadband router 33 . The information input device 35 may be, for example, a smart phone possessed by the user.

A solar power generation device 30 is installed in a home having the hot water storage type hot water supply device of the present embodiment. Below, the said household is simply called a "household." The solar power generation device 30 includes a solar cell or the like that receives sunlight and generates power. The DC power generated by the photovoltaic power generation device 30 is converted into AC power by a power conditioner (not shown) and supplied to homes. The hot water storage type hot water supply device in the home and the electrical equipment other than the hot water storage type hot water supply device can be operated by electric power generated by the photovoltaic power generation device 30 . During the nighttime when the photovoltaic power generation device 30 does not generate power, power is supplied to homes from the commercial power source of the electric power company. In addition, when the power generated by the photovoltaic power generation device 30 is insufficient for the power consumption of the home, the shortage of power is supplied to the home from the commercial power source.

The hot water storage type hot water supply apparatus of the present embodiment performs a nighttime heating operation using electric power supplied from a commercial power source during the nighttime as a heating operation, and a nighttime heating operation using electric power generated by the solar power generation device 30 during the daytime. It is possible to perform the daytime heating operation. The control unit 17 may perform the night-time heating operation using low-priced late-night power supplied from the commercial power supply during the late-night hours. The start time of the midnight time zone is, for example, 22:00 or 23:00. A value obtained by subtracting the power consumed by electrical equipment other than the hot water storage type hot water supply device from the power generated by the photovoltaic power generation device 30 is hereinafter referred to as "surplus power". In the present embodiment, heat is stored in the hot water storage tank 10 by the daytime heating operation using surplus electric power, so the amount of heat that needs to be stored in the hot water storage tank 10 is reduced by the nighttime heating operation. Therefore, it is possible to reduce the amount of power consumed in the nighttime heating operation, thereby reducing the electricity charges that the user pays to the electric power company.

Generally, the time at which the nighttime heating operation is started is, for example, 22:00 or 23:00, which is later than the evening hours when a concentrated hot water supply load such as filling the bathtub with hot water occurs. Therefore, it is necessary to store the required amount of heat in the hot water storage tank 10 by the time when the concentrated hot water supply load occurs on the next day by the nighttime heating operation of the current night and the daytime heating operation of the next day. In the following description, the amount of heat stored in the hot water storage tank 10 during the nighttime heating operation will be referred to as the "nighttime heating amount", and the amount of heat stored in the hot water storage tank 10 during the daytime heating operation will be referred to as the "daytime heating amount". The nighttime heating amount is proportional to the power consumption [kWh] of the nighttime heating operation. The daytime heating amount is proportional to the power consumption [kWh] of the daytime heating operation. Also, the amount of power generated by the photovoltaic power generation device 30 is referred to as "photovoltaic power amount [kWh]".

When the surplus power is used to perform the daytime heating operation, the amount of daytime heating that can be expected differs depending on the amount of photovoltaic power generation on the next day. If the amount of heating during the daytime on the next day is expected to be large, the amount of heating at nighttime that night may be small. Connect. However, if the weather turns worse than expected on the day on which the nighttime heating amount is suppressed in this way, the actual photovoltaic power generation amount will be less than expected, and the daytime heating amount will be less than expected. As a result, the required amount of heat cannot be stored in the hot water storage tank 10 . In this case, daytime electricity, which has a high unit price, is purchased from a commercial power supply and the daytime heating operation is performed, resulting in an increase in electricity charges. In order to prevent such situations, it is important to accurately predict the photovoltaic power generation amount for the next day before starting the nighttime heating operation.

The information input device 35 is configured so that the user can input power generation capacity information, which is information about the power generation capacity of the photovoltaic power generation device 30, and location information, which is information about the location of the photovoltaic power generation device 30. there is The power generation capacity information includes, for example, information on the value of the rated power generation capacity [kW] of the photovoltaic power generation device 30 . That is, the power generation capacity information corresponds to information on the system capacity of the photovoltaic power generation device 30 . The control unit 17 can receive power generation capacity information and location information input by the user to the information input device 35 via the Internet line 34 and the broadband router 33 .

The control unit 17 predicts the photovoltaic power generation amount for the next day using the power generation capacity information, the location information, and the weather forecast information for the next day. The power generated by the photovoltaic power generation device 30 changes according to the amount of solar radiation. The amount of solar radiation varies depending on the weather. In addition, even if the weather is the same, the amount of solar radiation for each hour differs depending on the latitude and longitude, and thus differs depending on the location of the photovoltaic power generation device 30 . The control unit 17 can accurately predict the amount of solar radiation for the next day by using the location information and the weather forecast information for the next day. The control unit 17 predicts the photovoltaic power generation amount for the next day by using the predicted next day's solar radiation amount and power generation capacity information.

The control unit 17 may receive weather forecast information for the next day distributed by the network. For example, the control unit 17 may receive, via the broadband router 33, the next day's weather forecast information delivered via the Internet line 34 from the Meteorological Agency or a weather forecast company. The control unit 17 predicts the amount of solar radiation for the next day using the weather forecast information about the location of the photovoltaic power generation device 30 among the received weather forecast information.

Alternatively, the user may input weather forecast information for the next day into the information input device 35 , and the control section 17 may receive the weather forecast information via the Internet line 34 and broadband router 33 . In this case, the control unit 17 does not need to be configured to receive the weather forecast information distributed over the network, so the system can be made simpler. As for the local weather, there are cases where the weather predicted by the user living in the local area has a higher probability than the weather forecast by the Meteorological Agency or a weather forecasting company. In such a case, the user inputs weather forecast information for the next day into the information input device 35, thereby improving the prediction accuracy of the amount of photovoltaic power generation. Note that the control unit 17 may receive both the weather forecast information input by the user to the information input device 35 and the weather forecast information distributed over the network. In that case, the user may operate the remote control 20 or the information input device 35 to set in advance which weather forecast information is to be used by the control section 17 .

In this embodiment, the information input device 35 communicates with the control unit 17 via the Internet line 34 and the broadband router 33, but as a modification, the information input device 35 and the control unit 17 can communicate directly. configuration. In addition, the user may input at least one of the power generation capacity information, the location information, and the weather forecast information to the remote controller 20 . That is, the remote control 20 may be used as an information input device.

Before starting the nighttime heating operation, the control unit 17 can accurately predict the amount of photovoltaic power generation for the next day as described above. The predicted solar power generation amount for the next day is hereinafter referred to as "photovoltaic power generation amount prediction value". If the predicted value of the solar power generation amount is large, the amount of heating during the daytime on the next day can be expected to be large. Therefore, when the predicted value of the amount of power generated by solar power is large, the control unit 17 performs control so that the amount of power consumed in the nighttime heating operation is less than when the predicted value of the amount of power generated by solar power is small. . Thereby, an electricity bill can be suppressed. The controller 17 may reduce the power consumption of the nighttime heating operation as the solar power generation power amount prediction value increases. That is, the control unit 17 may increase the power consumption of the nighttime heating operation as the solar power generation power amount prediction value is smaller. By doing so, even if the amount of boiling during the daytime on the next day is expected to be small, it is possible to reliably prevent the amount of heat stored in the hot water storage tank 10 from becoming insufficient.

An example of the method by which the controller 17 calculates the predicted solar power generation amount will be described below. First, the control unit 17 predicts the relationship between the amount of solar radiation and the time using location information and weather forecast information. For example, when the daytime weather forecast is clear, the amount of solar radiation is 200 W/m ² at 9:00 am, 400 W/m ² at 10:00 am, and 800 W/m ² at 11:00 am. predict as The predicted value of the amount of solar radiation for each hour is a value corrected according to the latitude and longitude. Next, the control unit 17 sets the power generation efficiency to 80%. Assuming that the rated power generation capacity of the photovoltaic power generation device 30 is 3 kW, from the above conditions, the control unit 17 determines the hourly predicted power generation of the photovoltaic power generation device 30 to be 0.48 kW between 9:00 am and Calculate like 0.96 kW at 10:00 and 1.92 kW at 11:00 am. The control unit 17 can calculate the predicted solar power generation amount by integrating the predicted power generation. The control unit 17 sets the value of the power generation efficiency higher as the weather forecast indicates less cloud cover, such as fine weather, and sets the power generation efficiency lower as the cloud content increases, such as cloudy weather or rain.

In the above example, the control unit 17 calculates the predicted value of the amount of photovoltaic power generation using the amount of solar radiation for each hour. may be used to calculate the predicted solar power generation amount.

In this embodiment, the postal code of the location of the photovoltaic power generation device 30 may be used as the location information. The control unit 17 can obtain the latitude and longitude from the postal code based on data stored in the memory in advance. By using the postal code as the location information, it becomes easier for the user to input the location information into the information input device 35 . However, location information in this disclosure is not limited to postal codes. For example, the user may input the name of the prefecture and the name of the municipality where the photovoltaic power generation device 30 is located to the information input device 35 as the location information.

Information about electric power expected to be consumed by electrical equipment other than the hot water storage type hot water supply apparatus during the daytime of the next day is hereinafter referred to as "power load information". The power load information may be input to the information input device 35 by the user. Electric power consumed by electric appliances other than the hot water storage type hot water supply apparatus in the home is hereinafter referred to as "domestic power consumption". Domestic power consumption is considered to be determined according to lifestyle patterns. The user can predict the next day's domestic power consumption by grasping the relationship between the daily life pattern and the domestic power consumption. The user may input into the information input device 35, as the power load information, the predicted value of domestic power consumption for each hour in the daytime of the next day.

The control unit 17 can predict the predicted surplus power, which is the surplus power for the next day, using the above-described power load information, power generation capacity information, location information, and weather forecast information. For example, the control unit 17 can calculate the predicted surplus power by subtracting the predicted value of the domestic power consumption for each hour in the power load information from the predicted power generated by the photovoltaic power generation device 30 for each hour.

The electric power required for the daytime heating operation is the sum of the electric power for operating the heat pump unit 6 and the electric power for operating the circulation pump 11 . The storage-type hot water supply apparatus of the present embodiment has a control mode in which when the predicted surplus power is smaller than the power required for the daytime heating operation, the electric power supplied from the commercial power supply is also used to perform the daytime heating operation on the next day. may have This control mode is hereinafter referred to as "first mode". According to the control in the first mode, even when the predicted surplus power is smaller than the power required for the daytime heating operation, the surplus power can be used to store heat in the hot water storage tank 10, so the surplus power can be used more effectively. can be used for

Further, the hot water storage type hot water supply apparatus of the present embodiment has a control mode in which the daytime heating operation of the next day is not executed when the predicted surplus power is smaller than the power required for the daytime heating operation. good. This control mode is hereinafter referred to as "second mode". According to the control in the second mode, it is possible to reliably prevent the purchase of electricity from the commercial power source during the day when the unit price is high. In the case of the second mode, the control unit 17 determines whether the predicted surplus power is smaller than the power required for the daytime heating operation before starting the nighttime heating operation. If the predicted surplus power is also small, the daytime heating amount is predicted to be zero, and the nighttime heating amount is determined.

The hot water storage type hot water supply apparatus of the present embodiment may have both the first mode and the second control mode, or may have only one of the control modes. When both the first mode and the second mode are provided, the user may be able to select which of the first mode and the second mode is to be executed. By doing so, convenience is improved.

The control unit 17 may receive the weather forecast for the day before starting the daytime heating operation or during execution of the daytime heating operation. In this case, the control unit 17 may receive the weather forecast for the day input by the user into the information input device 35, or the control unit 17 may receive the weather forecast information for the day distributed from the Meteorological Agency or a weather forecast company via the Internet line 34. 17 may receive. When the weather forecast for the day is received before starting the daytime heating operation or during the execution of the daytime heating operation, the control unit 17 determines the amount of solar power generated the previous day based on the received weather forecast for the day. is smaller than expected. When the controller 17 determines that the solar power generation amount will be smaller than the previous day's forecast, the controller 17 controls the power consumption in the daytime heating operation to be smaller than planned. As a result, it is possible to reliably suppress the purchase of daytime power, which has a high unit price, from the commercial power source.

It is desirable that the control unit 17 perform control so that the power consumption during the nighttime heating operation is greater than the power consumption during the daytime heating operation. By preferentially using late-night power over daytime power, the power company approves the device as late-night power equipment, so that the user can obtain a cost advantage.

FIG. 2 is a diagram showing a hot water storage type hot water supply apparatus of a comparative example. Referring to FIG. 2, the storage-type hot water supply apparatus of the comparative example will be described. Elements common to or corresponding to those of the storage-type hot water supply apparatus of Embodiment 1 are denoted by the same reference numerals, and the common description is simplified. reduced or omitted. The energy management device 31 manages domestic electric appliances including a hot water storage type hot water supply device. The control unit 17 is communicably connected to the energy management device 31 via the communication adapter 32 . The amount of power generated by the photovoltaic power generation device 30 is measured by the energy management device 31 . The energy management device 31 can calculate the surplus power by subtracting the domestic power consumption from the power generated by the photovoltaic power generation device 30 . Information on the surplus power is transmitted to the control unit 17 via the communication adapter 32 . Also, the communication adapter 32 can be connected to the broadband router 33 . The communication adapter 32 can acquire weather forecast information and the like via the Internet by connecting to the Internet line 34 via the broadband router 33 , and can transmit the acquired information to the control unit 17 . It is possible. The control unit 17 determines the nighttime heating amount for the current night based on the surplus power information obtained as described above, the weather forecast information for the next day, the heat storage amount information of the hot water storage tank 10, and the like. Since the hot water storage type hot water supply apparatus of the comparative example requires the energy management apparatus 31 and the communication adapter 32, the system price is high. On the other hand, the hot water storage type hot water supply apparatus of Embodiment 1 does not require the energy management device 31 and the communication adapter 32, so the system price can be reduced.

1 compressor 2 water-refrigerant heat exchanger 3 expansion valve 4 air heat exchanger 5 refrigerant circulation pipe 6 heat pump unit 10 hot water storage tank 11 circulation pump 12 switching valve 13 heat pump outgoing pipe 14 heat pump return Piping 15 Hot water storage piping 16 Bypass piping 17 Control unit 18 Tank unit 20 Remote controller 30 Solar power generation device 31 Energy management device 32 Communication adapter 33 Broadband router 34 Internet line 35 Information input device

Claims (10)

a water storage tank; and
a heating means for consuming electric power to heat water;
a control means for controlling a boiling operation for heating the water in the hot water storage tank by the heating means;
with
As the heating operation, it is possible to perform a nighttime heating operation using power supplied from a commercial power supply at night and a daytime heating operation using power generated by a solar power generation device during the daytime. ,
The control means is capable of receiving information input by a user into an information input device,
The information input device is configured so that a user can input power generation capacity information, which is information regarding the power generation capacity of the solar power generation device, and location information, which is information regarding the location of the solar power generation device,
The control means uses the power generation capacity information, the location information, and the next day's weather forecast information to predict the amount of photovoltaic power generation, which is the amount of power to be generated by the photovoltaic power generation device on the next day,
When the predicted amount of photovoltaic power generation on the next day is large, the control means controls the power consumption of the nighttime heating operation compared to when the predicted amount of photovoltaic power generation on the next day is small. Control so that the amount is small ,
A hot water storage type water heater that is not connected to an energy management device that manages electrical appliances in the home . 2. The hot water storage type hot water supply apparatus according to claim 1, wherein said control means can receive said weather forecast information input by a user to said information input device. 3. The hot water storage type hot water supply apparatus according to claim 1, wherein said control means can receive said weather forecast information distributed by a network. The hot water storage type hot water supply apparatus according to any one of claims 1 to 3, wherein the power generation capacity information is a value of a rated power generation capacity of the solar power generation device. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, wherein the location information is a postal code. The hot water storage type hot water supply device is capable of executing the daytime heating operation using surplus power out of power generated by the solar power generation device,
A user can input power load information, which is information about power expected to be consumed by electrical equipment other than the hot water storage type hot water supply apparatus during the daytime of the next day, into the information input device;
The control means uses the power generation capacity information, the location information, the weather forecast information, and the power load information to predict the predicted surplus power that is the surplus power for the next day,
a first mode for performing the daytime heating operation on the next day using the electric power supplied from the commercial power source when the predicted surplus power is smaller than the electric power required for the daytime heating operation; and a second mode for not executing the daytime heating operation on the next day when the predicted surplus power is smaller than the power required for the operation, or a control mode for both of them. Item 6. The hot water storage type hot water supply device according to any one of items 5. comprising both the first mode and the second mode of control,
7. The hot water storage type hot water supply apparatus according to claim 6, wherein a user can select which of said first mode and said second mode is to be executed. The control means is capable of receiving a weather forecast for the day before starting the daytime heating operation or during execution of the daytime heating operation,
When the control means determines that the solar power generation amount will be smaller than the previous day's forecast based on the weather forecast for the day, the control means controls the power consumption of the daytime heating operation to be smaller than planned. 8. The hot water storage type hot water supply apparatus according to any one of claims 1 to 7, wherein the hot water supply is controlled to . 9. The control means according to any one of claims 1 to 8, wherein the power consumption during the nighttime heating operation is greater than the power consumption during the daytime heating operation. The hot water storage type hot water supply device according to . The power generation capacity information is a value of the rated power generation capacity of the photovoltaic power generation device,
the location information is a postal code;
The control means obtains the latitude and longitude of the location using the zip code, predicts the next day's solar radiation using the latitude and longitude, and the weather forecast information, and calculates the predicted solar radiation and the The hot water storage type hot water supply apparatus according to any one of claims 1 to 9, wherein the photovoltaic power generation amount for the next day is predicted using the value of the rated power generation capacity.

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