JP5851229B2 - Hot water system - Google Patents

Description

  The present invention includes a plurality of water heaters each having a different heat source, each having a hot water storage tank, and hot water generated by a water heater that can supply hot water at the lowest cost among the plurality of water heaters. The present invention relates to a hot water supply system to be supplied.

  A hot water supply system having a plurality of hot water heaters each having a different heat source and having a hot water storage tank for each hot water heater has been proposed.

  For example, the technology described in Patent Document 1 includes a hot water storage tank, a main water heater having a heat pump, and an auxiliary water heater having a heating source different from the main water heater, and the main water heater is an auxiliary water heater. There has been proposed a hot water supply system that starts an operation of heating hot water in a hot water storage tank when switched to hot water supply.

JP 2011-149682 A

  However, although the technique described in Patent Document 1 includes a plurality of water heaters each having a different heating source for heating water, the cost of using the energy of the heating source and the amount of heat in the hot water storage tank are the lowest. It is not considered that hot water generated by a hot water heater that can supply hot water is used preferentially, and the operation cost of the hot water supply system cannot be reduced.

  The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a hot water supply system that supplies hot water generated by a hot water heater that can supply hot water at the lowest cost among a plurality of hot water heaters. And

In order to achieve the above object, the invention according to claim 1 is characterized in that a plurality of hot water supply devices that generate hot water at a predetermined temperature by heating water supplied from the outside by different heat sources, and the plurality of hot water supply devices, In order to store the generated hot water, a plurality of hot water storage devices provided in each of the plurality of hot water supply devices, and a temperature measurement that is provided in each of the plurality of hot water storage devices and measures the water temperature in each of the plurality of hot water storage devices. Means, water level measuring means provided in each of the plurality of hot water storage devices, for measuring the level of hot water, a plurality of hot water supply destinations to which hot water stored in the plurality of hot water storage devices is supplied, and the plurality Each of the hot water storage devices is provided so as to be openable and closable, and is opened so that hot water stored in the hot water storage device can be supplied to the hot water supply destination, and heat from the hot water supply destination. with accepting a request of water supply, the Calculating a measurement result and the measurement result and the amount of heat the hot water stored in each of the plurality of hot water storage device based on the temperature measuring means position measuring means, the amount of heat the hot water stored the largest hot water storage device The hot water storage device that can supply the hot water of the predetermined temperature at the lowest cost is determined, and the valve provided in the hot water storage device is controlled to open, and the hot water storage device stores the hot water from the measurement result of the water level measuring means. When it is determined that the hot water being used is less than a predetermined amount, for each of the plurality of hot water storage devices, the plurality of hot water storage based on the measurement result of the water level measurement means and the measurement result of the temperature measurement means It is necessary to recalculate the amount of hot water stored in each of the devices, and to generate a unit amount of the calculated amount of hot water stored in each of the plurality of hot water storage devices and hot water of a predetermined temperature. Cost for each different heat source Based on the mounting the cost table, the predetermined temperature can be supplied hot water storage device at the lowest cost of hot water was determined again, opening the valve provided in the hot water storage device determined the again other valves are closed And a control means for performing control.

  According to the first aspect of the present invention, the plurality of hot water supply devices that generate hot water having a predetermined temperature by heating water supplied from the outside by different heat sources are each a solar water heater, a fuel cell, or a gas engine. Thus, fuel cells and gas engines heat water with waste heat during operation.

  The plurality of hot water storage devices are hot water storage tanks in which hot water generated by a solar water heater, a fuel cell, or a gas engine is stored.

  The temperature measuring means is a sensor for measuring the water temperature in the hot water storage tank.

  The hot water supply destination is a place where hot water supplied with hot water such as a washstand is used.

  The plurality of valves are provided for the hot water storage tank and are opened to supply hot water in the hot water storage tank to the hot water supply destination.

  The control means calculates the heat quantity of hot water remaining in the hot water storage tank from the water temperature in the hot water storage tank, and the cost required to generate the heat quantity of hot water remaining in the hot water storage tank and hot water at a predetermined temperature The hot water storage tank that can supply hot water of a predetermined temperature at the lowest cost is determined based on the cost table described for each heat source, and a plurality of valves are controlled.

  According to the first aspect of the present invention, the hot water storage tank that can supply hot water at a predetermined temperature at the lowest cost is determined from the amount of hot water in the hot water storage tank and the cost table. It is possible to supply hot water generated by a water heater that can supply hot water at the lowest cost.

Further, according to the invention described in claim 1, if the hot water in the hot water storage tank selected falls below a predetermined amount, by calculating the heat quantity of hot water in the hot water storage tank again, at the lowest cost A hot water storage tank that can supply hot water can be selected again.

According to a second aspect of the present invention, one of the different heat sources is solar heat, and the control means has a water temperature in a hot water storage device provided in a hot water supply device using solar heat as a heat source equal to or higher than a predetermined threshold value. In this case, a valve provided in the hot water storage device may be opened, and hot water stored in the hot water storage device may be preferentially supplied to the plurality of hot water supply destinations.

According to invention of Claim 2 , the hot water produced | generated with the solar water heater with low cost which produces | generates hot water can be utilized preferentially.

According to a third aspect of the present invention, one of the different heat sources is heat generated by operation of a fuel cell. The fuel cell is used as the hot water supply device, and the control means uses solar heat as a heat source. If this is not possible, the hot water storage valve provided in the fuel cell may be opened to preferentially supply the hot water stored in the hot water storage device to the plurality of hot water supply destinations.

According to invention of Claim 3 , even if it is a case where a solar water heater cannot be used, the hot water produced | generated by the waste heat of a fuel cell can be supplied.

Further, as in the invention according to claim 4 , the operating state of the plurality of hot water supply devices, the temperature and amount of hot water in the plurality of hot water storage devices, the opening / closing state of the plurality of valves, by the control means, Moreover, you may further provide the display means which can display the information including the hot-water supply destination currently supplied with hot water.

According to invention of Claim 4 , a user can know the operating condition etc. of a hot-water supply system.

  As described above, according to the present invention, it is possible to provide a hot water supply system that supplies hot water generated by a hot water heater that can supply hot water at the lowest cost among a plurality of hot water heaters. .

It is the schematic which shows an example of the hot water supply system which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of HEMS which is a control apparatus which concerns on embodiment of this invention. It is a flowchart which concerns on control of the hot water supply system which concerns on embodiment of this invention. It is a figure which shows the 1st cost table which compared the cost of the heat source when producing the unit calorie | heat amount in the hot water supply system which concerns on embodiment of this invention. It is a figure which shows the 2nd cost table which compared the cost of the heat source when producing the unit calorie | heat amount in the hot water supply system which concerns on embodiment of this invention. It is a flowchart of the hot water storage tank selection process in control of the hot water supply system which concerns on embodiment of this invention.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating an example of a hot water supply system 1 according to an embodiment of the present invention. In addition, the continuous line in FIG. 1 shows the path | route of water (cold water or hot water) or gas, and a dotted line shall show an information line.

  In FIG. 1, gas supplied from a gas company is a fuel cell 10 constituting a cogeneration system such as “ENEFARM” (registered trademark), and a gas engine constituting a cogeneration system such as “Ecowill” (registered trademark). 12 and hot water supplied from the hot water storage tanks 20 to 24 are supplied to a hot water heater 16 that can be reheated.

  From the water supply, tap water (cold water) is supplied to the hot water storage tanks 20, 22 and 24 through the water supply valves 30, 32 and 34, respectively. When the hot water in the hot water storage tank is diminished by hot water supply, the water supply valve connected to the hot water storage tank is opened, and it is determined that the hot water storage tank is full from the measurement result of the water level sensor described later. Tap water is supplied.

  The hot water tank 30 stores hot water heated by heat generated when the fuel cell 10 generates power, and the hot water tank 32 stores hot water heated by heat generated when the gas engine 12 generates power. The hot water heated by the solar water heater 14 is stored in the hot water storage tank 34.

  As shown in FIG. 1, tap water is not directly supplied to the fuel cell 10, the gas engine 12, and the solar water heater 14 that are water heaters. The fuel cell 10, the gas engine 12 and the solar water heater 14 draw out the tap water stored in each hot water storage tank, heat it until it reaches a predetermined temperature, and return the hot water generated by the heating to the hot water storage tank. Yes. The predetermined temperature is preferably at least 90 degrees Celsius, although it depends on the types of heat sources such as waste heat of the fuel cell, waste heat of the gas engine, and solar heat.

  Water temperature sensors 40 a to 40 c are attached to the side wall of the hot water storage tank 30, water temperature sensors 42 a to 42 c are attached to the side wall of the hot water storage tank 32, and water temperature sensors 44 a to 44 c are attached to the side wall of the hot water storage tank 34. Measure the water temperature in the hot water storage tank.

  As the water temperature sensors 40a to 40c, 42a to 42c, and 44a to 44c, thermocouple sensors can be used as an example. Besides the thermocouple sensor, a thermistor or a resistance temperature detector may be used.

  In addition, the temperature of hot water stored in the tank differs between the upper and lower layers due to natural convection. In the present embodiment, as shown in FIG. 1, a total of three water temperature sensors are provided from the upper part to the lower part in one hot water tank, and the water temperatures of the upper layer, middle layer and lower layer in the hot water tank are respectively measured. .

  Water level sensors 40d, 42d and 44d for measuring the water level in the hot water storage tank are provided at the bottoms of the hot water storage tanks 20, 22 and 24, respectively. It is conceivable to use a water pressure sensor or a capacitance sensor as the water level sensor.

  When the water temperature indicated by the water temperature sensor is lower than a predetermined threshold value, the fuel cell 10, the gas engine 12, and the solar water heater 14 draw up and heat the water in the hot water storage tank, and the water temperature in the hot water storage tank is predetermined. It should be above the temperature, for example above 90 degrees Celsius.

  Although various temperatures can be considered as the predetermined threshold, a temperature of about 70 degrees Celsius is considered as an example.

  The hot water storage tanks 20, 22 and 24 are provided with hot water supply valves 50, 52 and 54, respectively, and when supplying hot water in each hot water storage tank, the hot water supply valves provided in each hot water storage tank are opened. The

  The hot water supplied from the hot water storage tanks 20 to 24 through the hot water supply valves 50 to 54 is collected in the hot water heater 16. When the temperature of the hot water supplied from the hot water storage tanks 20 to 24 is lowered, the water heater 16 heats the hot water using the supplied gas as a fuel so that the temperature is higher than a predetermined temperature. . The predetermined temperature is about 90 degrees Celsius as an example.

  The water heater 16 may be heated not by gas combustion but by electric heat.

  Hot water that has reached a predetermined temperature or higher by the water heater 16 is supplied to hot water supply destinations such as a wash basin 62, a shower 64, a floor heating 66, a bath 68, a panel heater 70, a kitchen 72, and an air conditioner 74.

  In addition, the hot water supply system according to the present embodiment includes a control device 80 that controls the hot water supply valves 50 to 54 based on a request for supplying hot water from each hot water supply destination.

  The control device 80 acquires the water temperature and the water level information in each hot water storage tank detected by the water temperature sensor and the water level sensor via the fuel cell 10, the gas engine 12, and the solar water heater 14, and the acquired water temperature in each hot water storage tank. The amount of hot water stored in each of the hot water storage tanks 20 to 24 is calculated from the water temperature and water level information.

  The control device 80 stores a cost table in which the cost required to generate a unit amount of hot water at a predetermined temperature is described separately for the fuel cell 10, the gas engine 12, and the solar water heater. Based on the amount of heat of hot water stored in each of 20 to 24, a hot water storage tank capable of supplying hot water at a predetermined temperature at the lowest cost is determined, and a hot water supply valve provided in the determined hot water storage tank is opened. Take control.

  The control device 80 closes the hot water supply valves 50 to 54 by controlling the water supply valves 30 to 34 based on the water levels in the hot water storage tanks acquired via the fuel cell 10, the gas engine 12, and the solar water heater 14. When the hot water storage tanks 20 to 24 are filled, the hot water storage tanks 20 to 24 are filled as much as possible.

  In addition, the control device 80 may use a home energy management system (HEMS) that manages and controls energy in a building.

  FIG. 2 is a block diagram showing a schematic configuration of the HEMS 90 which is the control device 80 according to the present embodiment.

  The HEMS 90 includes a computer and includes a CPU 96, a ROM 98, a RAM 100, and an input / output port 102 as shown in FIG. 2, and these include a bus 104 such as an address bus, a data bus, and a control bus. Are connected to each other.

  A display unit 106, an operation unit 108, and a memory 110 are connected to the input / output port 102 as various input / output devices. Note that the display unit 106 and the operation unit 108 are integrally formed, and a touch panel provided in the display unit 106 can be applied to the operation unit 108.

  The display unit 106 includes the operating status of the fuel cell 10, the gas engine 12, and the solar water heater 14, the temperature and amount of hot water in the hot water storage tanks 20 to 24, and the opening and closing of the water supply valves 30 to 34 and the hot water supply valves 50 to 54. Information including the situation and the hot water supply destination where hot water is supplied may be displayed.

  The memory 110 includes a program for controlling the water supply valves 30 to 34 and the hot water supply valves 50 to 54, a program for calculating the amount of heat of hot water stored in each of the cost table and the hot water storage tank, a cost table and a hot water storage tank. A program for determining a hot water storage tank that can supply hot water at a predetermined temperature at the lowest cost based on the amount of heat stored in each hot water, and various information for executing these programs are stored. .

  The HEMS 90 controls the water supply valves 30 to 34 and the hot water supply valves 50 to 54 by developing a program stored in the memory 110 on the RAM 100 and executing the program on the CPU 96.

  Further, hot water supply destinations such as the hot water supply valves 50 to 54, the water supply valves 30 to 34, the fuel cell 10, the gas engine 12, the solar water heater 14, and the wash basin 62 are connected to the input / output port 102. .

  Subsequently, control of the hot water supply system 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart relating to the control of the hot water supply system according to the embodiment.

  In step 300, the amount of hot water in each hot water storage tank is calculated. The volume of hot water corresponding to the upper layer, middle layer, and lower layer is calculated based on the water temperature measured by the water temperature sensor of the hot water tank at the upper, middle, and lower layers of the hot water tank, assuming that each hot water tank is full. And the specific heat capacity of water, respectively, and the products obtained by the multiplication are summed.

  In step 300, if the hot water storage tank is not full, the capacity of hot water stored in the lower, middle and upper layers of the hot water storage tank is determined based on the water level measured by the water level sensor. Each capacity is multiplied by the corresponding water temperature and the specific heat capacity of water, and the products obtained by the multiplication are summed.

  In step 302, the hot water storage tank having the largest amount of heat is selected.

  In step 304, when there is a request for hot water supply from each hot water supply destination, such as when a faucet is opened, the hot water supply valve of the hot water storage tank having the largest amount of heat is opened to start hot water supply. When the water temperature in the selected hot water storage tank is lower than a predetermined temperature, the hot water heater 16 heats the water. The predetermined temperature can take various values, but as an example, it may be about 90 degrees Celsius.

  In step 306, it is determined whether or not the hot water supply request from each hot water supply destination has been completed. If it is determined that the hot water supply has ended, the hot water supply valve is closed to end the hot water supply. Whether or not the request for hot water supply from each hot water supply destination is completed can be determined, for example, by whether or not the faucet for hot water supply is closed.

  After it is determined in step 306 that the hot water supply has not ended, it is determined in step 308 whether or not the hot water in the hot water storage tank has become less than a predetermined amount. The predetermined amount can take various values depending on the capacity of the hot water storage tank or the like, but as an example, it can be considered to be about 40% of the capacity of the hot water storage tank.

  In step 306, when the hot water in the hot water storage tank becomes less than a predetermined amount, in step 310, the hot water supply valve of the hot water storage tank that has supplied hot water is closed and the hot water supply valve is opened to fill the hot water storage tank.

  In step 312, the amount of hot water stored in each hot water storage tank is recalculated.

  In step 314, a hot water storage tank capable of heating the water in the hot water storage tank at the lowest cost is selected with reference to a cost table described later. Detailed processing of step 314 will be described later.

  In step 316, the hot water supply valve of the selected hot water storage tank is opened and hot water supply is resumed. When the water temperature in the selected hot water storage tank is lower than a predetermined temperature, the hot water heater 16 is used for heating as in step 304.

  In step 318, it is determined whether or not the hot water supply request from each hot water supply destination has been completed. If it is determined that the hot water supply has ended, the hot water supply valve is closed to end the hot water supply.

  After it is determined in step 318 that the hot water supply has not ended, it is determined in step 320 whether the hot water in the hot water storage tank has become less than a predetermined amount. As an example, the predetermined amount may be about 40% of the capacity of the hot water storage tank.

  FIG. 4 is a diagram illustrating an example of a first cost table according to the present embodiment. In FIG. 4, the ratio of the cost of the heat source for generating the unit heat quantity is shown. Since the price of city gas varies depending on the price of natural gas as a raw material, in FIG. 4 and FIG. 5 to be described later, it is not an amount but a unit heat amount generated by solar heat, a gas engine and a fuel cell. Cost ratio.

  In FIGS. 4 and 5, the lower heating value, which is the amount of heat obtained by subtracting the heat generated by burning the fuel and the evaporation heat of the water originally contained in the fuel from the total heating value when the fuel is burned, is used as a reference. I have to.

Hereinafter, the lower heating value per 1 m ^{3 of} city gas is set as H, and the charge per 1 m ^{3 of} city gas is set as P.

  Further, it is assumed that the heat recovery efficiency due to heat generation during power generation of the fuel cell is 50% on the basis of the lower heating value.

In this case, the heat recovery cost C _FC per unit heat quantity by the fuel cell is as shown in the following formula (1).
C _FC = P / H × 0.50 (1)

On the other hand, if the heat recovery rate of the gas engine co-generator is 63% on the basis of the lower heating value, the heat recovery cost C _GE per unit heat amount by the gas engine co-generator is as shown in the following equation (2): Become.
C _GE = P / H × 0.63 (2)

  Therefore, from the above formulas (1) and (2), the cost ratio between the fuel cell and the gas engine co-generator per unit calorie is 1.26: 1.

  Solar heat requires power to send water to the solar water heater, but it is not directly related to the cost of burning city gas, so the power is not directly related to the cost of burning city gas. Therefore, it is not considered as the cost for generating the unit heat quantity.

  Gas engines and fuel cells also require power to pump water from hot water storage tanks, but the power is not directly related to the cost of city gas combustion, so it is considered as the cost for generating unit heat. Not.

  In addition, since the first cost table and the second cost table described later describe the cost ratio, the cost ratio of heat generation is the ratio of the cost required to generate a unit amount of hot water at a predetermined temperature. You can consider it. This is because it is not necessary to consider how much heat is transferred from the heat source to the water if it is “ratio”.

  FIG. 5 is a diagram showing an example of the second cost table in the present embodiment. This second cost table is referred to when the solar water heater cannot be used at night or in bad weather.

  Next, the hot water storage tank selection process in step 314 of FIG. 3 will be described in detail with reference to FIG. FIG. 6 is a flowchart of hot water storage tank selection processing in the control of the hot water supply system according to the embodiment of the present invention.

  In step 600, it is determined whether solar heat can be used. Specifically, when the temperature measured by a thermometer provided in the solar water heater is equal to or higher than a predetermined temperature, it may be determined that solar heat can be used. In the present embodiment, it is assumed that the predetermined temperature is 90 degrees Celsius.

  If solar heat is available, in step 602, the first cost table shown in FIG. 4 is selected.

  In step 604, a hot water storage tank that can be heated at the lowest cost is selected from the first cost table and the amount of hot water in each hot water storage tank recalculated in step 312 of FIG.

  Specifically, the cost required for heating is compared until the recalculated amount of heat reaches the amount of heat when the hot water storage tank is filled with hot water at a predetermined temperature. The predetermined temperature is assumed to be 90 degrees Celsius.

  In the present embodiment, since the first cost table describes the cost ratio of the fuel cell, the gas engine, and the solar heat, the recalculated amount of hot water in the hot water storage tank and the hot water storage tank are predetermined. The difference from the amount of heat in the case where the hot water of the temperature is full is multiplied by the numerical value of the first cost table relating to the heat source of the heating device connected to the hot water storage tank.

  As a result, it can be determined that the hot water storage tank having the smallest product obtained by the multiplication is a hot water storage tank capable of heating the internal hot water at the lowest cost.

  In the present embodiment, since the numerical value of the solar heat cost ratio in the first cost table is “0”, the recalculated amount of heat of the hot water storage tank connected to the solar water heater and the heat of the hot water storage tank at a predetermined temperature. Even if the difference from the amount of heat when water is full is large, the product obtained by the multiplication is “0”.

  However, if the difference in the amount of heat is large, it takes time to reach a predetermined temperature, which is not practical. Therefore, the hot water storage tank in which the difference in the amount of heat is larger than a predetermined threshold value may be excluded from the hot water supply target even if the cost required for heating to a predetermined temperature is the lowest.

  Or when the temperature of the hot water in the hot water storage tank provided in the solar water heater is a predetermined threshold, for example, 90 degrees Celsius or more, the hot water supply valve of the hot water storage tank is opened and the hot water stored in the hot water storage tank is stored. May be preferentially supplied to a plurality of hot water supply destinations.

  As described above, after selecting the tank that can heat the hot water in the hot water storage tank at the lowest cost in Step 604, the procedure proceeds to Step 316 in FIG. 3, and hot water supply from the selected hot water storage tank is started. .

  If solar heat cannot be used in step 600, the second cost table shown in FIG. 5 is selected in step 606, and the internal hot water can be heated in step 608 at the lowest cost as in step 604. Select a hot water storage tank.

  As described above, according to the hot water supply system according to the present embodiment, it is possible to select a hot water storage tank capable of heating the internal hot water at the lowest cost based on the first and second cost tables. Hot water generated by a water heater that can supply hot water at low cost can be supplied.

  If a device capable of supplying electric power from PHV (Plug-in Hybrid Vehicle) or HV (Hybrid Vehicle) is provided, water stored in any of hot water storage tanks 20 to 24 is supplied from PHV or HV. You may make it heat with the generated electric power.

DESCRIPTION OF SYMBOLS 10 Fuel cell 12 Gas engine 14 Solar water heater 16 Hot water heater 20, 22, 24 Hot water storage tank 30, 32, 34 Water supply valve 40a, 40b, 40c Water temperature sensor 40d Water level sensor 42, 42b, 42c Water temperature sensor 42d Water level sensor 44a, 44b , 44c Water temperature sensor 44d Water level sensor 50, 52, 54 Hot water supply valve 62 Wash basin 64 Shower 66 Floor heating 68 Bath 70 Panel heater 72 Kitchen 74 Air conditioning 80 Controller 90 HEMS
96 CPU
98 ROM
100 RAM
102 I / O Port 104 Bus 106 Display Unit 108 Operation Unit 110 Memory 1 Hot Water Supply System

Claims (4)

A plurality of hot water supply devices for heating water supplied from outside by different heat sources to generate hot water of a predetermined temperature ;
In order to store hot water generated by the plurality of hot water supply devices, a plurality of hot water storage devices provided in each of the plurality of hot water supply devices,
A temperature measuring means provided in each of the plurality of hot water storage devices, each for measuring a water temperature in the plurality of hot water storage devices;
A water level measuring means which is provided in each of the plurality of hot water storage devices and measures the water level of hot water;
A plurality of hot water supply destinations to which hot water stored in the plurality of hot water storage devices is supplied;
A plurality of valves that are provided so as to be openable and closable with respect to each of the plurality of hot water storage devices, and that are opened to allow hot water stored in the hot water storage device to be supplied to the hot water supply destination.
With accepting a request for hot water supplied from the hot water supply destination, the amount of heat of hot water stored in each of the plurality of hot water storage device based on the measurement result of the measuring results and the temperature measuring means of the level measuring means The hot water storage device that calculates and stores the largest amount of stored hot water is determined to be the hot water storage device that can supply hot water at the predetermined temperature at the lowest cost, and control is performed to open a valve provided in the hot water storage device. And when it is determined from the measurement result of the water level measurement means that the hot water stored in the hot water storage device has become less than a predetermined amount, the measurement result of the water level measurement means for each of the plurality of hot water storage devices. And the amount of hot water stored in each of the plurality of hot water storage devices is calculated again based on the measurement result of the temperature measuring means, and the hot water stored in each of the plurality of hot water storage devices calculated again is calculated . Heat quantity and predetermined temperature Based costs required to produce a unit amount of water in the cost table as described by the different heat sources, wherein a supply capable hot water storage device is again determined at the lowest cost of hot water of a predetermined temperature, was determined the re hot water storage Control means for controlling the opening of the valve provided in the apparatus and closing the other valve ;
Hot water supply system equipped with. One of the different heat sources is solar heat,
The control means opens the valve provided in the hot water storage device when the water temperature in the hot water storage device provided in the hot water supply device using solar heat as a heat source is equal to or higher than a predetermined threshold, and stores the heat stored in the hot water storage device. The hot water supply system according to claim 1 , wherein water is preferentially supplied to the plurality of hot water supply destinations. One of the different heat sources is heat due to the operation of the fuel cell, and the fuel cell is the hot water supply device,
When the solar heat cannot be used as a heat source, the control means opens a valve of a hot water storage device provided in the fuel cell, and preferentially uses hot water stored in the hot water storage device to the plurality of hot water supply destinations. The hot water supply system according to claim 2 , wherein the hot water supply system is supplied. Information including the operation status of the plurality of hot water supply devices by the control means, the temperature and heat quantity of hot water in the plurality of hot water storage devices, the status of opening and closing of the plurality of valves, and the hot water supply destination to which hot water is supplied. The hot water supply system according to any one of claims 1 to 3 , further comprising display means capable of displaying.

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