JP2010014391A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system capable of achieving further energy saving as the whole system. <P>SOLUTION: The hot water supply system includes a storage means 4 comprising a battery 4a for charging electric power obtained from sunlight energy by using a photovoltaic power generation panel 40 as a power generation means and discharging the electric power; a heat pump unit 1 driven by a direct current using the electric power obtained from sunlight energy and heating fluid used for supplying water for hot water supply; a tank 3 storing the fluid heated by the heat pump unit 1; a PCS 6 selecting a supply source of the direct current applied to the heat pump unit 1 from the photovoltaic power generation panel 40 or the storage means 4 and controlling the charge/discharge of the direct current and the storage means 4; and a heat exchanger 7 moving the heat quantity of the fluid by making the fluid in the tank 3 flow to control the temperature of the PCS 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water supply system including a heat pump type heating device driven by a direct current using electric power obtained from nature.

As this type of conventional hot water supply system, there is known a system that drives a hot water supply apparatus using both electric power stored in a solar cell and midnight power (for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-9539

  In the conventional hot water supply system, the power of the solar cell is converted into an alternating current by a DC / AC converter, and the hot water supply device is driven by the alternating current. And since the conversion efficiency of a converter is about 90%, energy loss will arise by conversion.

  On the other hand, solar cells are required to be charged and discharged as efficiently as possible from the viewpoint of effective use of energy. In order to perform charging and discharging properly, it is desired that a power control device that controls charging / discharging and power supply of a solar cell be used in an appropriate temperature environment.

  As described above, the conventional hot water supply system has a problem that the electric power obtained from the photovoltaic power generation cannot be effectively utilized as a whole system from the viewpoint of the current conversion efficiency and the operating environment of the power control device.

  Then, this invention was made | formed in view of the said problem, The objective is to provide the hot water supply system which can aim at the further energy saving as the whole system.

  In order to achieve the above object, the following technical means are adopted. In other words, the first invention relating to the hot water supply system is that the electric power obtained from the natural energy using the power generation means is charged and discharged, the electric storage means (4) comprising the battery (4a) to be discharged, and the electric power obtained from the natural energy. A heat pump type heating device (1) that is driven by a direct current using a heat source to heat a fluid used to supply hot water, a tank (3) that stores the fluid heated by the heat pump type heating device, and a heat pump type The source of the direct current supplied to the heating device is selected from the power generation means or the power storage means, and the power control means (6) for controlling the direct current and the charge / discharge of the power storage means, and the fluid in the tank are circulated, And a temperature adjusting means (7) for adjusting the temperature of the power control means by moving the amount of heat it has.

  According to the present invention, for example, power obtained from natural energy such as sunlight, wind power, and hydropower is supplied as a direct current without being converted into an alternating current, and the heat pump heating device is driven by the direct current. Thus, it is possible to prevent the loss of power obtained from the natural world due to current conversion. Further, by providing the temperature adjusting means, it is possible to appropriately adjust the temperature of the power control means using the fluid in the tank. Thereby, charging / discharging of the electrical storage means and current supply control by the power control means are appropriately performed. In addition, since the amount of heat stored in the tank is effectively used for both hot water supply and temperature control of the power control means, electric power obtained from natural energy is effectively used for the entire hot water supply system. Therefore, it is possible to provide a hot water supply system that can further save energy in the entire system.

  The tank and the power control means are preferably provided in the same housing (2). According to the present invention, regarding the temperature adjustment of the power control means, in addition to the use of the heat amount due to the fluid in the tank flowing, the heat transfer via the air by the heat released from the tank can also be used. As a result, the amount of heat stored in the tank is effectively utilized for both fluid movement and air propagation, so that further energy saving of the hot water supply system can be achieved.

  Further, the temperature adjusting means includes a primary side circulation circuit (30, 33) in which the primary side fluid stored in the tank circulates and a secondary side circulation circuit in which the secondary side fluid passing through the power control means circulates. (34) and heat exchange means (7) for exchanging heat between the primary fluid and the secondary fluid are preferably included.

  According to this invention, the primary side fluid which is hot water supply water is heat-exchanged with the secondary side fluid by the heat exchange means via the independent primary side flow path and the secondary side flow path, and the temperature of the power control means. Therefore, the flow path configuration of each circulation circuit can be simplified. Further, since the temperature of the power control means is not directly adjusted with the hot water supply water, it is easy to ensure the sanitary aspect of the hot water supply water.

  Further, a heat exchanger (39) that thermally contacts the secondary fluid after passing through the power control means and before flowing into the heat exchanging means with the primary fluid before flowing into the tank. It is preferable to provide.

  According to this invention, the heat of the secondary fluid before flowing in by the heat exchange means can be given to the primary fluid before flowing into the tank. Thereby, the heating by a heat pump type heating apparatus can be assisted and the boiling output of a heat pump type heating apparatus can be reduced. Therefore, further energy saving of the system can be achieved.

  Further, it is preferable that the temperature adjusting means adjusts the temperature of the power storage means by causing the heat in the fluid to move by circulating the fluid in the tank, and the power storage means is provided in the same casing together with the tank.

  According to this invention, the temperature adjusting means can adjust the temperature of both the power storage means and the power control means using the fluid in the tank. Thereby, it becomes possible to keep the temperature of the battery appropriate, and it is also possible to obtain an improvement in the charging efficiency and discharging efficiency of the battery. Therefore, further energy saving of the entire hot water supply system can be achieved.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means of embodiment mentioned later.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also combinations of the embodiments even if they are not specified unless there is a problem with the combination. Is also possible.

(First embodiment)
The hot water supply system of 1st Embodiment which is one Embodiment of this invention is demonstrated using FIG. FIG. 1 is a schematic diagram showing the configuration of the hot water supply system of the present embodiment. FIG. 1 shows a state in which the front portion of the housing 2 is removed so that the state of each part in the housing 2 can be understood.

  This hot water supply system is composed of a hot water supply unit that creates hot water supply water and a power supply unit that supplies electric power, and by circulating the fluid in the tank, the amount of heat of the fluid is moved to control the temperature of the battery. Temperature adjusting means for adjusting is provided. The hot water supply unit includes a heat pump unit 1 that is a heat pump type heating device that heats a fluid used for supplying hot water, a tank 3 that stores the heated fluid, and a hot water supply functional unit that controls a path of hot water and the like. And 5. The power supply unit includes a power storage unit 4 including a plurality of batteries 4a that perform charging and discharging, and a power conditioner system 6 (hereinafter referred to as PCS 6) as a power control unit that controls charge / discharge of the power storage unit 4 at least. It is out. And these each part is connected by various piping etc.

  The operation of each part is controlled by a system control apparatus 100 which is a control means capable of controlling each part in the system. The system control device 100 may be a single control device that is provided in the same place as the hot water supply function product unit 5 and controls the entire system, or a plurality of control devices that are in charge of controlling each unit in the system. It may be a control device to be integrated.

  The hot water supply system of this embodiment is a form in which the power storage means 4, the PCS 6, and the tank 3 are housed in the housing 2. This hot water supply system is mainly used for hot water supply for general households. The power storage means 4 is an aggregate of a plurality of batteries 4a housed in a rack, and uses various power generation means from natural energy (hereinafter referred to as natural energy) such as system power, solar thermal energy, wind energy, and hydraulic energy. Store the obtained power. The electric power stored in the power storage means 4 can be widely used for hot water supply devices, household appliances in a house, automobiles, and the like. The PCS 6 has a function of selecting a DC current supply source to be supplied to the heat pump unit 1 from the power generation unit or the power storage unit 4 and controlling the DC current and charging / discharging of the power storage unit 4. The PCS 6 may be configured so as to be able to control the operation of other residential equipment in addition to controlling the charging / discharging of the power storage means 4.

  The heat pump water heater adjusts the hot water stored in the tank 3 and the hot water boiled in the heat pump unit 1 to a temperature that satisfies the set temperature of the hot water supply to the kitchen, washroom, bathroom, etc. Supply to the terminal using the hot water supply. The hot water use side terminals are hot water faucets such as showers, currants, hand-washing taps, and bath tubs. The heat pump unit 1 is a heating device that is driven by a direct current using electric power obtained from natural energy.

  The temperature adjusting means of the present embodiment heats the primary side fluid (hot water supply water) stored in the tank 3 and the secondary side fluid (brine) forcedly circulated so as to pass through the power storage means 4 and the PCS 6. By exchanging heat with the exchanger 7, the heat absorption and heat dissipation of the battery 4 a and the PCS 6 are controlled via the secondary fluid, and the temperature of the battery 4 a and the PCS 6 is adjusted. In this temperature adjustment, when the battery 4a is charged and discharged, the temperature of the battery 4a is adjusted to a temperature band in which charge / discharge efficiency can be efficiently performed, and the PCS 6 is set to an appropriate temperature band in which the PCS 6 can exhibit a predetermined control function. The temperature is adjusted.

  The power storage means 4 is an aggregate of a plurality of batteries 4a composed of lithium secondary batteries, nickel metal hydride batteries, and the like, and each battery 4a is installed in a predetermined rack so as to be stacked with a predetermined interval. Each battery 4a is surrounded by a flow path 4b of a secondary side fluid formed in the rack, and transfers heat to the secondary side fluid flowing through the flow path 4b. Among the stacked batteries 4a, a plurality of batteries 4a at predetermined positions are provided with battery thermistors 23 for detecting the surface temperature. The power storage means 4 is obtained by using various power generation means from natural energy in order to store inexpensive midnight power (an example of system power) from a system power supply and to drive the heat pump unit 1 when necessary. To store the electric power. The midnight time zone power is used for both the power storage in the power storage means 4 and the operation of the heat pump cycle. That is, in the time zone of midnight power, power storage in the power storage means 4 and heat storage in the tank 3 by operation of the heat pump cycle are performed.

  The heat pump unit 1 has a heat pump cycle that uses carbon dioxide having a low critical temperature as a refrigerant, and includes at least a compressor, a water-refrigerant heat exchanger as a radiator, a variable decompressor, an evaporator, and a gas-liquid separation. The devices are connected to form a closed circuit. The heat pump unit 1 heats up hot water by exchanging heat between a high-temperature and high-pressure refrigerant flowing through the refrigerant flow path of the water-refrigerant heat exchanger and water flowing through the water flow path of the water-refrigerant heat exchanger. . The heat pump unit 1 is a DC drive type device driven by a direct current. That is, the compressor, variable pressure reduction, etc. are driven by a direct current. The system control device 100 receives detection information from various thermistors, performs calculation using a built-in program, and controls the operation of the variable pressure reducer and the compressor.

  When carbon dioxide is used as the refrigerant and the heat pump cycle is constituted by a supercritical heat pump, hot water having a temperature higher than that of a general heat pump cycle, for example, about 85 ° C. to 90 ° C. can be stored in the tank 3. The heat pump unit 1 is a hot water supply operation that heats up the hot water in the tank 3 mainly when the hot water stored in the tank 3 is insufficient or the midnight power in the midnight time zone where the price setting is inexpensive is used. I do. The heat pump unit 1 can also operate the heat pump cycle by using the electric power stored in the power storage means 4 or the electric power obtained from natural energy by the power generation means for the operation of the compressor or the like.

  The tank 3 is a container for storing a hot water supply fluid, and is made of a metal excellent in corrosion resistance, for example, stainless steel. In the present embodiment, since the hot water in the tank 3 is discharged directly as hot water supply water, the hot water supply fluid stored in the tank 3 is water. A water supply pipe (not shown) for taking in city water such as tap water is connected to the lower part of the tank 3.

  A heat insulating material is provided on the outer periphery of the tank 3, and hot water for hot water supply can be kept warm for a long time. The tank 3 has a vertically long shape, and includes a can body thermistor 20 including five thermistors arranged in the height direction in order to detect a hot water storage amount and a hot water storage temperature inside the tank 3. The temperature information of hot water or water filled in the tank 3 at each water level is output to the system controller 100. Therefore, the system control apparatus 100 detects the boundary position between the hot water heated up in the tank 3 and the water before boiling in the tank 3 based on the temperature information detected by the can body thermistor 20. In addition, the hot water storage amount can be detected.

  A circulation pipe 30 is connected to the tank 3 to connect the lower part in the tank 3 and the upper part in the tank 3 via a water flow path of a water-refrigerant heat exchanger. The circulation pipe 30 is a boiling passage through which water in the lower part of the tank 3 is heated in the water passage of the water-refrigerant heat exchanger. In the middle of the circulation pipe 30, a pump 9 is provided as a driving means for forcibly circulating the water in the tank 3. By operating the heat pump cycle and the pump 9, the lower water in the tank 3 is heated and then returned to the upper high-temperature water section in the tank 3. Further, the tank 3 includes an intermediate return pipe 31 that connects the circulation pipe 30 downstream of the water-refrigerant heat exchanger and the intermediate part in the tank 3, and an upstream portion of the water-refrigerant heat exchanger. An intermediate part take-out pipe 32 that connects the circulation pipe 30 and the intermediate part in the tank 3 is connected.

  The intermediate part return pipe 31 is a flow path through which water heated by the heat pump unit 1 is returned to the intermediate part in the tank 3. A switching valve 12 is provided at the connection between the circulation pipe 30 and the intermediate return pipe 31. A pre-tank thermistor 21 that detects the water temperature before the tank inflow is provided on the upstream side of the switching valve 12. The switching valve 12 allows the hot water heated by the water-refrigerant heat exchanger to flow to the upper part in the tank 3 or the intermediate part in the tank 3 according to the water temperature detected by the thermistor 21 before entering the tank. Inflow point switching means. The intermediate portion extraction pipe 32 is a flow path that passes when water (medium temperature water) stored in the intermediate portion in the tank 3 is extracted. A switching valve 8 is provided at the junction of the circulation pipe 30 and the intermediate part extraction pipe 32. The switching valve 8 is tank outflow point switching means that can switch the extraction of the water in the tank 3 from the lower part in the tank 3 or the intermediate part in the tank 3.

  The tank 3 is connected to a hot water supply pipe (not shown) that causes the hot water in the high temperature water section in the upper part of the tank 3 to flow out to the hot water supply use side terminal. The hot water supply piping communicates with showers, currants, hand-washing taps, bath tubs, etc. The hot water supply pipe is connected to the hot water supply functional part 5, and a part thereof is included in the hot water supply functional part 5.

  The hot water supply functional part 5 is configured by, for example, a form in which a solenoid valve, a flow rate counter, a check valve, various thermistors, a flowing water switch, a pump, and the like and piping connecting them are integrated. Further, the hot water supply functional part 5 can be configured as a box-shaped unit component in which the pipe length is shortened as much as possible to reduce pressure loss and flow path resistance. The hot water supply functional part 5 is arranged in a dead space radially outward on the side surface of the tank 3 in the vicinity of the corner and the inner wall surface in the housing 2. Moreover, the hot water supply functional part 5 can be configured by forming each hot water supply functional part, piping, and the like with a resin material, and can be reduced in weight to improve workability and maintainability.

  Here, the hot water supply functional component is a component disposed on the flow path having the function of controlling the flow of hot water supply water, and stops the flow of the fluid, changes the flow direction, and controls the pressure in the pipe. Or a driving part such as a pump for forcibly moving the fluid, or a device for heating the fluid. In addition, the hot water supply functional component may be constituted by a DC drive type device that is driven by a direct current, like the heat pump unit 1.

  The heat exchanger 7 used as the temperature adjusting means includes a primary side heat exchange channel provided in the middle of the primary side pipe 33 through which the primary side fluid (water for hot water supply) in the extracted tank 3 flows, The secondary side heat exchange flow path provided in the middle of the secondary side piping 34 communicating with the flow path 4b of the means is included inside as a flow path for exchanging heat with each other. The primary side pipe 33 includes a portion of the circulation pipe 30 located before the primary side fluid flowing out of the tank 3 flows into the water-refrigerant heat exchanger of the heat pump unit 1 before heat exchange, and water-refrigerant heat. A flow path that connects the post-heat exchange portion of the circulation pipe 30 located until the primary fluid flowing out of the exchanger flows into the tank 3 is formed.

  The primary-side circulation circuit is a circuit mainly composed of the circulation pipe 30 and the primary-side pipe 33. The inside of the tank 3, the switching valve 8, the pump 9, the switching valve 10, the heat exchanger 7, and the switching valve 11, a switching valve 12, and a circuit through which the primary fluid flows in the order of the inside of the tank 3. A primary side inlet thermistor 22 that detects the temperature of the primary side fluid before flowing into the heat exchanger 7 is provided in the primary side piping 33 upstream of the primary side heat exchange flow path. .

  A switching valve 10 is provided at a portion of the circulation pipe 30 before heat exchange. The switching valve 10 is a heat exchange switching means capable of switching whether the water in the tank 3 is exchanged through the heat exchanger 7 or not through the heat exchanger 7. It is. A switching valve 11 is provided at the site of the circulation pipe 30 after heat exchange. The switching valve 11 can switch whether the water that has passed through the heat exchanger 7 is sent into the tank 3 after passing through the heat pump unit 1 or sent into the tank 3 without going through the heat pump unit 1. Inflow path switching means.

  The secondary side pipe 34 constitutes a circulation flow path that connects the outflow part and the inflow part of the flow path 4b of the power storage means. The secondary side fluid (brine) of the flow path 4b is sealed in advance in the secondary side pipe 34 or the like, and the secondary side pipe 34 is driven by the driving force of the pump 14 provided in the middle of the secondary side pipe 34. Is forced to circulate. The secondary-side circulation circuit is a circuit that is mainly configured by the secondary-side piping 34 and in which the fluid passing through the power storage means 4 circulates. The flow path 4 b of the power storage means, the switching valve 13, the heat exchanger 7, and the pump 14. The secondary fluid flows in the order of the switching valve 15 and the flow path 4b of the power storage means. A secondary-side inlet thermistor 24 that detects the temperature of the secondary-side fluid before flowing into the heat exchanger 7 is provided at the inlet of the secondary-side heat exchange channel of the heat exchanger 7. A secondary-side outlet thermistor 25 that detects the temperature of the secondary-side fluid that has flowed out of the heat exchanger 7 is provided at the outlet of the secondary-side heat exchange channel of the heat exchanger 7.

  The PCS 6 is surrounded by a flow path 6a through which the secondary side fluid flows, and transfers heat to the secondary side fluid that flows through the flow path 6a. The PCS 6 is provided on the side of the tank 3 and the power storage means 4 in the housing 2 and is particularly susceptible to the heat released by the tank 3. The PCS 6 is provided with a PCS thermistor 26 that detects its surface temperature.

  A PCS side pipe 35 communicating with the flow path 6a is connected to the secondary side pipe 34. The PCS side pipe 35 includes a portion of the secondary side pipe 34 that is located before the secondary fluid flowing out from the heat exchanger 7 flows into the flow path 4b of the power storage means, and the flow path 4b. The flow path which connects the site | part after the electrical storage means passage of the secondary side piping 34 located in the exit of this is comprised. Thus, since the flow path 6a of the PCS 6 is disposed in the middle of the PCS side pipe 35, it is connected in parallel with the flow path 4b of the power storage means.

  A switching valve 15 is provided at a portion of the secondary side pipe 34 before passing through the power storage means. The switching valve 15 can switch whether the secondary fluid heat-exchanged by the heat exchanger 7 is allowed to flow only to the power storage means 4, only to the PCS 6, or to both the power storage means 4 and the PCS 6. It is a temperature adjustment object switching means. A switching valve 13 is provided at a portion of the secondary side pipe 34 after passing through the power storage means. The switching valve 13 is a temperature adjustment target switching means that operates in conjunction with the switching valve 15. When the flow path in the secondary side pipe 34 and the flow path in the PCS side pipe 35 are brought into communication, When the passage on the PCS side piping 35 is opened and the flow path in the PCS side piping 35 is closed, the passage on the PCS side piping 35 is closed and only the passage on the secondary side piping 34 side is provided. To be released.

  Next, the structure for supplying the direct current which is the electric power obtained from natural energy to the heat pump unit 1 is demonstrated. FIG. 2 is a block diagram showing a supply path of a direct current supplied to the heat pump unit 1.

  As shown in FIG. 2, in this embodiment, solar energy is used as an example of natural energy. A photovoltaic power generation panel 40 that is a power generation means that generates power by obtaining solar energy is connected to a power supply switch 62 through a backflow prevention element 61 (backflow prevention diode). The power switch 62 is connected to the power supply port of the heat pump unit 1 through a booster circuit 63 that includes a coil, a transistor, a resistor, and the like. The backflow prevention element 61, the power supply switch part 62, and the booster circuit 63 are included in the PCS 6. The first supply side contact 62 a of the power supply switch 62 is connected to the backflow prevention element 61 and connected to the photovoltaic power generation panel 40. A second supply-side contact 62 b of the power supply switch part 62 is connected to the battery 4 a of the power storage means 1. The demand side contact 62 c of the power supply switch part 62 is connected to the booster circuit 63 and connected to the power supply port of the heat pump unit 1.

  Thereby, the direct current of the electric power obtained by the solar power generation flows through the plurality of supply paths by connecting each contact of the power supply switch section 62 with another contact. Specifically, when the first supply-side contact 62a and the second supply-side contact 62b are switched so as to be connected, the direct current generated by the photovoltaic power generation panel 40 is charged to the power storage means 4. Thus, when switching is performed so that the first supply side contact 62a and the demand side contact 62c are connected, the direct current generated by the photovoltaic power generation panel 40 is boosted to 250V to 300V by the booster circuit 63. To the power supply port of the heat pump unit 1. When the second supply side contact 62b and the demand side contact 62c are switched so as to be connected, the electric power charged in the power storage means 4 is converted into a DC current boosted to 250V to 300V by the booster circuit 63. It is supplied to the power supply port of the unit 1. The direct current supplied to the power supply port of the heat pump unit 1 is given to each component of the heat pump unit 1 according to a command from the system control device 100 and drives them.

  The system control apparatus 100 is mainly composed of a microcomputer, and a preset control program or an updatable control program is provided in a ROM or RAM built in as a storage means. The system control device 100 acquires temperature information detected by each thermistor 20, 21, 22, 23, 24, 25, and based on the result of calculating a predetermined program using these temperature information, each switching valve The operation of 8, 10, 11, 12, 13, 14 and pumps 9, 14 is controlled. Further, the system control device 100 controls the operation of the PCS 6 in order to effectively use the direct current generated by the solar power generation panel 40.

  Next, the flow of fluid in each state of the hot water supply system configured as described above will be described with reference to FIG. 3-8 is the schematic diagram which showed the flow of the fluid of each state in this hot water supply system. In addition, in FIG. 3 to FIG. 8, for easy understanding, only the components related to the flow of the fluid are shown, the piping through which the fluid flows is shown by a solid line, and the piping through which the fluid does not flow is shown by a broken line. .

  First, FIG. 3 shows the initial state of the boiling operation by the heat pump unit 1. In this state, the water accumulated in the lower part of the tank 3 flows out into the circulation pipe 30 by the driving force of the pump 9 and is heated by the water-refrigerant heat exchanger of the heat pump unit 1 and then returned to the intermediate part. It returns to the middle part in the tank 3 through the pipe 31. The flow of the primary fluid at this time is as follows: the lower part in the tank 3, the switching valve 8, the pump 9, the switching valve 10, the heat pump unit 1, the switching valve 11, the switching valve 12, the intermediate return pipe 31, and the intermediate in the tank 3. It becomes part order. Further, the secondary fluid is not driven and no flow is formed.

  Next, FIG. 4 shows a boiling operation state in which the boiling operation proceeds more than in FIG. 3 and hot water heated to the target temperature is supplied into the tank 3. In this state, the water accumulated in the lower part of the tank 3 flows out into the circulation pipe 30 by the driving force of the pump 9 and is heated to the target temperature by the water-refrigerant heat exchanger of the heat pump unit 1. Subsequently, the water returns to the upper part of the tank 3 through the circulation pipe 30 as high-temperature water. At this time, the primary fluid flows through the circulation pipe 30 in the order of the lower part in the tank 3, the switching valve 8, the pump 9, the switching valve 10, the heat pump unit 1, the switching valve 11, the switching valve 12, and the upper part in the tank 3. . Further, the secondary fluid is not driven and no flow is formed.

  Next, FIG. 5 shows the state of the cooling operation for cooling the power storage means 4. The system control device 100 executes this state control when the temperature of the battery 4a is higher than a predetermined temperature range. The predetermined temperature range is an efficient temperature range for charging and discharging the battery 4a, and is stored in the system controller 100 in advance. In this state, the low temperature primary fluid accumulated in the lower part of the tank 3 flows into the circulation pipe 30 by the driving force of the pump 9, and the passage on the primary pipe 33 side is fully opened by the switching valve 10. In this state, the passage on the side of the circulation pipe 30 is fully closed, so that it flows into the primary side pipe 33. The primary side fluid passes through the primary side heat exchange flow path of the heat exchanger 7, travels through the primary side piping 33, and switches to the tank through the intermediate return pipe 31 by switching the switching valves 11 and 12. Return to the middle part in 3. The primary fluid during the cooling operation is the lower part in the tank 3, the switching valve 8, the pump 9, the switching valve 10, the heat exchanger 7, the switching valve 11, the switching valve 12, the intermediate return pipe 31, and the tank 3. It flows through the cooling circuit in the order of the middle part. In addition, when the temperature of the fluid before the tank inflow detected by the thermistor 21 before the tank inflow is 65 ° C. or more, the passage on the circulation pipe 30 side is opened to 100% by the switching valve 12 and the primary side fluid is supplied to the tank. Return to the upper part instead of the middle part in 3.

  On the other hand, the secondary side fluid flows out from the flow path 4b of the power storage means into the secondary side pipe 34 by the driving force of the pump 14, and the passage on the secondary side pipe 34 side is fully opened by the switching valve 13, When the passage on the PCS side pipe 35 side is fully closed, it further flows in the secondary side pipe 34. The secondary side fluid flows into the secondary side heat exchange flow path of the heat exchanger 7, where it dissipates heat to the primary side fluid flowing through the primary side heat exchange flow path, and the secondary side fluid. Heat transfer from to the primary fluid occurs and is cooled. The cooled secondary fluid proceeds in the secondary piping 34 opened by the switching valve 15 and returns to the flow path 4b of the power storage means. Here, the battery 4a dissipates heat to the cooled secondary fluid that flows around it, and heat transfer from the battery 4a to the secondary fluid occurs to cool the battery. The secondary fluid during the cooling operation flows through the secondary side pipe 34 in the order of the flow path 4b of the power storage means, the switching valve 13, the heat exchanger 7, the pump 14, the switching valve 15, and the flow path 4b of the power storage means. . By repeating the primary side flow and the secondary side flow described above, the temperature of the battery 4a is lowered and adjusted to a predetermined temperature range, and the environment is controlled so that highly efficient charge and discharge can be performed. The

  Next, FIG. 6 shows a state at the time of a heating operation for warming the power storage means 4. The system control device 100 executes this state control when the temperature of the battery 4a is lower than a predetermined temperature range. In this state, the battery 4a is heated using the intermediate temperature primary fluid accumulated in the intermediate portion of the tank 3. The intermediate temperature primary side fluid flows into the intermediate take-out pipe 32 by switching the driving force of the pump 9 and the switching valve 8, and the passage on the primary side piping 33 side is fully opened by the switching valve 10 to circulate. When the passage on the side of the pipe 30 is fully closed, it flows into the primary side pipe 33. The primary side fluid passes through the primary side heat exchange flow path of the heat exchanger 7, travels through the primary side piping 33, and switches to the tank through the intermediate return pipe 31 by switching the switching valves 11 and 12. Return to the middle part in 3. The flow of the primary side fluid during the heating operation is as follows: the intermediate part in the tank 3, the switching valve 8, the pump 9, the switching valve 10, the heat exchanger 7, the switching valve 11, the switching valve 12, and the intermediate part return pipe 31. The order of the middle part in the tank 3 is the order. Also in this case, when the temperature of the fluid before the tank inflow detected by the thermistor 21 before the tank inflow is 65 ° C. or more, the switching valve 12 is controlled so that the primary side fluid is not in the middle portion in the tank 3. Return to the top.

  On the other hand, the secondary fluid flows in the cooling circuit as in FIG. Then, the secondary side fluid flows into the secondary side heat exchange channel of the heat exchanger 7, where it absorbs heat from the primary side fluid flowing through the primary side heat exchange channel, and 2 from the primary side fluid. Heat transfer to the secondary fluid occurs and warms up. The heated secondary fluid proceeds in the secondary piping 34 opened by the switching valve 15 and returns to the flow path 4b of the power storage means. Here, the battery 4a absorbs heat from the heated secondary fluid flowing around, and heat is transferred from the secondary fluid to the battery 4a to be warmed. By repeating the primary side flow and the secondary side flow described above, the temperature of the battery 4a rises and is adjusted to a predetermined temperature range, and is controlled in an environment where high-efficiency charging / discharging can be performed. The

  Next, FIG. 7 shows a state in the cooling operation for cooling the PCS 6. The system control device 100 executes this cooling operation control when the temperature of the PCS 6 is higher than a predetermined temperature. This is because if the operation is continued at a temperature higher than the predetermined temperature, the PCS 6 is deteriorated. The predetermined temperature is stored in the system controller 100 in advance. In the cooling operation state, the primary fluid flows through the cooling circuit as in FIG. Also in this case, when the temperature of the fluid before the tank inflow detected by the thermistor 21 before the tank inflow is 65 ° C. or more, the switching valve 12 is controlled so that the primary side fluid is not in the middle portion in the tank 3. Return to the top.

  On the other hand, the secondary side fluid flows out from the flow path 6 a of the PCS 6 into the PCS side piping 35 by the driving force of the pump 14, and flows into the secondary side piping 34 by the switching valve 13. The secondary side fluid flows into the secondary side heat exchange channel of the heat exchanger 7, where it dissipates heat to the low temperature primary side fluid that flows through the primary side heat exchange channel. Heat transfer from the side fluid to the primary fluid occurs and is cooled. The cooled secondary fluid proceeds in the PCS side pipe 35 opened by the switching valve 15 and returns to the flow path 6a of the PCS 6. Here, the PCS 6 dissipates heat to the cooled secondary fluid flowing around it, and heat is transferred from the PCS 6 to the secondary fluid to be cooled. The secondary fluid in this case flows through the PCS side circulation circuit in the order of the flow path 6a of the PCS 6, the switching valve 13, the heat exchanger 7, the pump 14, the switching valve 15, and the flow path 6a of the PCS 6. By repeating the flow on the primary side and the flow on the secondary side as described above, the temperature of the PCS 6 is lowered and adjusted to a predetermined temperature range, and deterioration of the PCS 6 can be prevented.

  Next, FIG. 8 shows a state in the cooling operation in which both the power storage means 4 and the PCS 6 are cooled at the same time. The system control device 100 executes this state control when the temperature of the battery 4a is higher than the predetermined temperature range and the temperature of the PCS 6 is higher than the predetermined temperature. In the cooling operation state, the primary fluid flows in the same manner as in FIG. Also in this case, when the temperature of the fluid before the tank inflow detected by the thermistor 21 before the tank inflow is 65 ° C. or more, the switching valve 12 is controlled so that the primary side fluid is not in the middle portion in the tank 3. Return to the top.

  On the other hand, for the secondary side fluid, both the passage on the secondary side pipe 34 side and the passage on the PCS side pipe 35 side are fully opened by the switching valve 13, and the driving force of the pump 14 causes the power storage means A flow that flows out from the flow path 4 b into the secondary side pipe 34 and a flow that flows out from the flow path 6 a of the PCS 6 into the PCS side pipe 35 occur, and merges at the switching valve 13 and flows into the secondary side pipe 34. . The combined flow flows into the secondary heat exchange flow path of the heat exchanger 7, where it dissipates heat to the low temperature primary fluid flowing through the primary heat exchange flow path, and the secondary side. Heat transfer from the fluid to the primary fluid occurs and is cooled. The cooled secondary fluid is divided into the passage on the power storage means 4 side and the passage on the PCS 6 side opened by the switching valve 15 and returns to the flow path 4 b of the power storage means and the flow path 6 a of the PCS 6. Here, the battery 4a and the PCS 6 dissipate heat to the cooled secondary fluid flowing around them, and are cooled respectively. By repeating the above-described primary-side flow and secondary-side flow, the temperatures of the power storage means 4 and the PCS 6 are lowered and adjusted to a predetermined temperature range and a predetermined temperature, respectively.

  Next, control for adjusting the temperature of the power storage unit 4 in the hot water supply system will be described. This hot water supply system adjusts the temperature of the power storage means 4 in parallel with the operation of boiling normal hot water stored using midnight time zone power, or at different times. Processing related to temperature adjustment of the power storage unit 4 is executed by the system control device 100.

  When the state of the power storage means 4 is either before charging or before discharging, and the temperature of the battery 4a is 20 ° C. or lower, the system control device 100 performs a heating operation for heating the battery 4a in the low temperature state. Start and control this operation. In this heating operation control, the fluid flow shown in FIG. 6 is formed. In this heating operation control, for example, the temperature at the outlet of the heat exchanger 7 detected by the secondary-side outlet thermistor 25 becomes an upper limit value (40 ° C.) of a predetermined temperature range (25 ° C. or more and 40 ° C. or more). Next, the rotational speed of the pump 9 on the primary side is controlled. Thus, when the temperature at the outlet of the heat exchanger 7 is set to a high temperature, the temperature of the secondary fluid rises and the temperature of the battery 4a also rises. This heating operation control is continued until the temperature of the battery 4a becomes 25 ° C. or higher.

  On the other hand, when the state of the power storage means 4 is either charging or discharging and the temperature of the battery 4a is not within a predetermined temperature range, the system control device 100 determines that the battery 4a has a desired charge / discharge efficiency. In order to be able to demonstrate, the following temperature control operation control is executed. In this temperature adjustment operation control, when the temperature of the battery 4a exceeds the upper limit value (40 ° C.) of the predetermined temperature range, the cooling operation described in FIG. 5 is performed. The rotational speed of the primary pump 9 at this time is such that the temperature of the battery 4a detected by the battery thermistor 23 is a predetermined temperature while monitoring the temperature of the outlet of the heat exchanger 7 detected by the secondary outlet thermistor 25. Feedback control is performed until the temperature is within a range (25 ° C to 40 ° C).

  In the temperature adjustment operation control, when it is determined that the temperature of the battery 4a is lower than the lower limit (25 ° C.) of the predetermined temperature range, the heating operation described with reference to FIG. 5 is performed. The rotational speed of the primary pump 9 at this time is feedback controlled in the same manner as in the cooling operation.

  Next, control for cooling the PCS 6 to adjust the temperature will be described. The temperature adjustment control of the PCS 6 is performed in parallel with the operation of boiling the normal hot water that is performed by using the midnight time zone power, or at the same time as the temperature adjustment control of the power storage means 4. Further, the temperature adjustment control of the PCS 6 may be performed simultaneously with the temperature adjustment control of the power storage unit 4 as described above with reference to FIG. 8, or may be performed independently as described above with reference to FIG. Processing related to the temperature adjustment of the PCS 6 is executed by the system control device 100.

  When the temperature of the PCS 6 exceeds the upper limit value (80 ° C.) of the predetermined temperature range, the system control device 100 performs the cooling operation described with reference to FIG. The rotational speed of the secondary pump 14 at this time is controlled to a constant value. As a result, the primary fluid and the secondary fluid exchange heat when passing through the heat exchanger 7, and the secondary fluid having a high temperature dissipates heat to the primary fluid and is cooled. At this time, the primary pump 9 is controlled as follows so that the temperature of the PCS 6 falls within a predetermined temperature range (60 ° C. or more and 80 or less) where deterioration is not promoted. That is, the rotational speed of the primary pump 9 is feedback controlled until the temperature of the PCS 6 detected by the PCS thermistor 26 falls within a predetermined temperature range (60 ° C. or more and 80 ° C. or less).

  When the temperature adjustment control of the PCS 6 and the temperature adjustment control of the power storage means 4 are performed in parallel, the rotational speed of the primary pump 9 is controlled by the temperature adjustment control of the PCS 6 and the temperature at the outlet of the heat exchanger 7 is monitored. However, by adjusting the opening degree of the switching valve 13, both the temperature of the PCS 6 and the temperature of the battery 4a may be adjusted simultaneously. Further, when the temperature of the PCS 6 is less than the lower limit value (60 ° C.) of the predetermined temperature range, the control for heating the PCS 6 by taking out the high-temperature fluid in the tank 3 and exchanging heat with the secondary fluid. I do.

  Next, a procedure for driving the heat pump unit 1 using a direct current generated by the photovoltaic power generation panel 40 in the hot water supply system will be described. The system control apparatus 100 executes each process for supplying the direct current according to the flow shown in FIG. FIG. 9 is a flowchart showing an example of a driving procedure of the heat pump unit 1 using the direct current.

  First, the system control device 100 determines whether or not there is a boiling operation command in step 10. This boiling operation command is a command for executing a boiling operation excluding a boiling operation performed in the late-night power hours. In other words, it is a boiling operation command for performing a boiling operation without using midnight power during the daytime when the amount of heat stored in the tank 3 is reduced. The boiling operation in this case is performed so as to satisfy the boiling temperature, capacity, amount of heat, and the like based on learning information calculated from past results.

  The system control device 100 connects the first supply side contact 62a and the second supply side contact 62b and switches the power supply switch 62 to the charge side while there is no boiling command. Thereby, the electric power from the solar energy generated by the solar power generation panel 40 is charged in the battery 4 a of the power storage means 4. If there is a boiling operation command, it is next determined whether or not the amount of photovoltaic power generated by the photovoltaic panel 40 is equal to or greater than a predetermined value (step 30). This amount of photovoltaic power generation is obtained by detecting a current value passing through a circuit that reaches the photovoltaic power generation panel 40 to the power source selector switch unit 62.

  If it is determined in step 30 that the amount of photovoltaic power generation is greater than or equal to a predetermined value, in step 40, the first supply side contact 62a and the demand side contact 62c are connected to connect the power supply switch 62 to the solar power source. Switch to. Thereby, the electric power from the solar energy generated by the solar power generation panel 40 is boosted to 250 V to 300 V by the booster circuit 63 and then supplied to the power supply port of the heat pump unit 1, and the direct current is directly converted into the heat pump unit 1. As a drive source. Then, the heat pump unit 1 performs the above-described boiling operation (step 50).

  On the other hand, if it is determined in step 30 that the amount of photovoltaic power generation is less than the predetermined value, in step 45, the second supply side contact 62b and the demand side contact 62c are connected to connect the power supply switch 62 to the battery 4a. Switch to the side. Thereby, the electric power from the solar energy stored in the battery 4 a is boosted to 250 V to 300 V by the booster circuit 63 and then supplied to the power supply port of the heat pump unit 1, and the direct current is directly driven by the heat pump unit 1. As a source. And it jumps to step 50 and the heat pump unit 1 performs the above-mentioned boiling operation. In addition, the determination process in step 30 may be a determination using the solar radiation information acquired by the system control device 100 communicating with the Internet, digital broadcasting, or the like.

  As described above, the electric power obtained from natural energy (solar energy, etc.) is charged to the power storage means 4 when the boiling operation is not required, and sufficient power is supplied from the power generation means when the boiling operation is required. When it can be supplied, it is supplied to the heat pump unit 1, and when the boiling operation is necessary and sufficient power cannot be supplied from the power generation means, the power of the battery 4 a stored in advance is supplied to the heat pump unit 1. Thereby, natural energy (solar energy etc.) is used properly according to the situation, and it is effectively used with a reduced loss.

  The hot water supply system is a device installed outside a house eaves or a veranda of an apartment house, for example, like an outdoor unit of a home air conditioner. And when this kind of apparatus is installed in a confined area such as under a house eaves or on a veranda, it is arranged in such a direction that the depth direction becomes thinner.

  The housing | casing 2 is a box which comprises the outer shell of the principal part of this hot-water supply system, and is a container which is enclosed by the top | upper surface, the side surface, the back surface, the front surface, and the bottom part, and the heat pump side is open | released. At the bottom of the housing 2, a leg 2 a that extends downward in the vertical direction is provided. The leg 2a is fixed to the foundation for installation with an anchor bolt or the like.

  Inside the housing 2, a tank 3, a power storage means 4, and a PCS 6 are accommodated, and these are arranged in the same closed space. For this reason, since the heat released from the tank 3 stays in the closed space, the air temperature in this space rises to warm the power storage means 4 and the PCS 6 and raise the temperature of the power storage means 4 and the PCS 6. Thereby, the power storage means 4 and the PCS 6 can be further heated by a synergistic effect combined with the use of the heat storage of the fluid in the tank 3, which is particularly useful in the winter in a cold district. Therefore, further energy saving of the hot water supply system can be achieved.

  The effects brought about by the hot water supply system according to the present embodiment will be described below. This hot water supply system is obtained from solar energy, which is composed of a battery 4a that charges and discharges electric power obtained from solar energy, which is an example of natural energy, using the solar power generation panel 40 of the power generation means. A heat pump unit 1 that is driven by a direct current using electric power to heat a fluid used for supplying hot water and a tank 3 that stores the fluid heated by the heat pump unit 1 is provided. Further, the hot water supply system selects a DC current supply source to be applied to the heat pump unit 1 from the photovoltaic power generation panel 40 or the power storage means 4, and the PCS 6 as a power control means for controlling the DC current and charging / discharging of the power storage means 4; And a heat exchanger 7 as temperature adjusting means for adjusting the temperature of the PCS 6 by moving the amount of heat of the fluid by circulating the fluid in the tank 3.

  According to this configuration, the electric power obtained from the natural energy is not converted into an alternating current, but the direct current is supplied and the heat pump type heating device is driven with the direct current. Loss of the obtained power can be prevented. Moreover, by providing the heat exchanger 7 which is a temperature control means, the fluid in the tank 3 used for supply of hot water supply water can be used for temperature control of the PCS 6. Thereby, charging / discharging of the electrical storage means and current supply control by the power control means are appropriately performed. The amount of heat stored in the tank is effectively used for both hot water supply water and temperature control of the power control means. Therefore, it is possible to provide a hot water supply system in which electric power obtained from natural energy is effectively used for the entire hot water supply system, and further energy saving of the entire hot water supply system can be achieved.

  Moreover, according to this hot water supply system, when the heat amount in the tank 3 is insufficient during the daytime or the like, the heat pump unit 1 can be operated using natural energy (for example, solar energy). The amount of heat to be stored can be reduced, and the tank 3 can be downsized.

(Second Embodiment)
The hot water supply system of the second embodiment is different from the hot water supply system of the first embodiment in the secondary fluid and the tank 3 after passing through the power storage means 4 and the PCS 6 and before flowing into the heat exchanger 7. It is the modification provided with the auxiliary | assistant heat exchange means which makes the primary side fluid before flowing in into thermal contact. FIG. 10 is a schematic diagram showing the configuration of the hot water supply system of the present embodiment. This hot water supply system has the same effects as the hot water supply system of the first embodiment except that the heat exchanger 39 is provided.

  As shown in FIG. 10, the auxiliary heat exchanging means includes a primary passage 39 a provided in the middle of the circulation pipe 30 that connects the switching valve 11 and the switching valve 12, the switching valve 13, and the heat exchanger 7. And a secondary side passage 39b provided in the middle of the secondary side pipe 34 communicating with the secondary side heat exchange flow path. And heat exchange is performed between the primary side fluid which flows through the primary side channel | path 39a, and the secondary side fluid which flows through the secondary side channel | path 39b.

  With this configuration, the heat of the secondary fluid circulating in the secondary piping 34 can be applied to the primary fluid before flowing into the tank 3 by the heat exchanger 39. As a result, when the heating operation by the heat pump unit 1 and the operation of the power supply functional unit such as the power storage unit 4 and the PCS 6 are performed simultaneously, the temperature of the primary fluid rises due to heat exchange with the secondary fluid. Therefore, the auxiliary heat exchange means can assist boiling by the heat pump unit 1. Thereby, target boiling temperature can be controlled low and the energy saving of boiling operation can be achieved.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the solar power generation panel 40 that generates and generates solar energy as power generation means has been described as an example. Natural energy includes, for example, wind power and hydraulic power in addition to sunlight. As a means, you may comprise the rotary machine rotated using energy, such as a wind force and hydraulic power.

  Further, the working refrigerant flowing through the circuit of the heat pump unit 1 is not limited to carbon dioxide, but may be other refrigerants such as Freon.

  Moreover, although the heat pump unit 1 of the said embodiment is based on the supercritical heat pump cycle from which the pressure of a refrigerant | coolant becomes more than a critical pressure, it is not limited to this, The pressure of a refrigerant | coolant is based on the heat pump cycle below a critical pressure. It may be a thing.

  Moreover, in each said embodiment, although the heating control and cooling control of PCS6 were demonstrated using the heat exchanger 7, the form is not limited to this system. For example, a method in which the water in the tank 3 is allowed to flow through the flow path 6a of the PCS 6 to directly cool and warm the PCS 6 may be employed.

  Further, in each of the above-described embodiments, the embodiment is described in which the cooling or heating operation is performed when the temperature of the battery 4a is outside the predetermined temperature range, but the time required to complete the charging of the battery 4a, Cooling required to bring the battery 4a into a predetermined temperature range from at least one of the outside air temperature, the temperature of the battery 4a, and the temperature detected by the thermistor disposed below the can body thermistor 20. Alternatively, the heating operation time may be calculated, and the cooling or heating operation may be started by shifting the heating operation time calculated before the heating pump hot water supply operation start time of the heat pump unit 1.

  Moreover, in each said embodiment, although the form which adjusts the temperature of the battery 4a and PCS6 with the water which flows in this hot water supply system was demonstrated, as a form which adjusts temperature with the air which passed the evaporator of the heat pump unit 1, Good.

It is the schematic diagram which showed the structure of the hot water supply system of 1st Embodiment. It is the block diagram which showed the path | route of the direct current supplied to the heat pump unit 1 of 1st Embodiment. In the hot water supply system of 1st Embodiment, it is the schematic diagram which showed the flow of the fluid of the boiling operation initial stage by the heat pump unit 1. FIG. FIG. 5 is a schematic diagram showing a flow of fluid in a boiling operation state in which hot water boiled to a target temperature is supplied into the tank 3. FIG. 5 is a schematic diagram illustrating a fluid flow in a state where the power storage unit 4 is cooled. It is the schematic diagram which showed the flow of the fluid in the state which heats the electrical storage means. It is the schematic diagram which showed the flow of the fluid in the state which cools PCS6. It is the schematic diagram which showed the flow of the fluid in the state when cooling both the electrical storage means 4 and PCS6 simultaneously. It is a flowchart which shows an example of the drive procedure of the heat pump unit 1 which uses the direct current obtained from natural energy. It is the schematic diagram which showed the structure of the hot water supply system of 2nd Embodiment.

Explanation of symbols

1 ... Heat pump unit (heat pump type heating device)
2 ... Case 3 ... Tank 4 ... Power storage means 4a ... Battery 6 ... Power conditioner system (power control means)
7 ... Heat exchanger (temperature control means, heat exchange means)
30 ... circulation piping (primary side circulation circuit)
33 ... Primary side piping (Primary side circulation circuit)
34 ... Secondary piping (secondary circulation circuit)
39 ... Heat exchanger

Claims (5)

Power storage means (4) composed of a battery (4a) for charging and discharging electric power obtained from the energy in nature using a power generation means;
A heat pump heating device (1) that is driven by a direct current using electric power obtained from the natural energy and heats a fluid used for supplying hot water;
A tank (3) for storing the fluid heated by the heat pump heating device;
A source of the direct current supplied to the heat pump heating device is selected from the power generation means or the power storage means, and a power control means (6) for controlling the direct current and charge / discharge of the power storage means;
Temperature adjusting means (7) for adjusting the temperature of the electric power control means by moving the amount of heat of the fluid by circulating the fluid in the tank;
A hot water supply system comprising:   The hot water supply system according to claim 1, wherein the tank and the power control means are provided in the same casing (2).   The temperature adjusting means includes a primary-side circulation circuit (30, 33) in which a primary-side fluid stored in the tank circulates, and a secondary-side circulation in which a secondary-side fluid that passes through the power control means circulates. The hot water supply system according to claim 1 or 2, comprising a circuit (34) and heat exchange means (7) for exchanging heat between the primary fluid and the secondary fluid.   Further, the heat that causes the secondary fluid after passing through the power control means and before flowing into the heat exchanging means to thermally contact the primary fluid before flowing into the tank. The hot water supply system according to claim 3, further comprising an exchanger (39). Further, the temperature adjusting means adjusts the temperature of the power storage means by moving the amount of heat of the fluid by circulating the fluid in the tank,
The hot water supply system according to any one of claims 1 to 4, wherein the power storage means is provided in the same casing (2) together with the tank.

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