JP2021018021A - Hot water storage type water heater - Google Patents

Abstract

To provide a hot water storage type water heater capable of satisfying an actual DR execution request from a power electric company.SOLUTION: A hot water storage type water heater comprises a tank that stores hot water, a boiling device that performs boiling operation of heating water and storing hot water in the tank, and a control device that controls the boiling device so that an accumulated heat storage amount stored in the tank after the boiling operation starts reaches a target heat storage amount. When the control device receives a DR execution request regarding the adjustment of the power consumption transmitted from the electric power company, the control device controls the boiling operation on the day of reception according to the DR execution request.SELECTED DRAWING: Figure 7

Description

The present invention relates to a hot water storage type hot water supply device such as a heat pump water heater.

Conventionally, an electric power company sends a demand response implementation request (hereinafter referred to as a DR implementation request) for adjusting the power consumption of a hot water storage type hot water supply device, which is a consumer device, to a consumer, and the power consumption is transmitted to the consumer. There is a method to encourage adjustment. As a technology related to this type of DR, for example, an operation plan for the next day of the hot water storage type hot water supply device is formulated based on the DR implementation request, and on the day of DR, the hot water storage type hot water supply device is controlled according to the operation plan to adjust the power. There is a system (see, for example, Patent Document 1).

JP-A-2015-206499

In Patent Document 1, the content of the DR implementation request used when creating the operation plan is only a prediction. For this reason, if the weather is unexpected on the day of DR, the electric power company may issue a DR implementation request that is different from the forecast. In this case, if the hot water storage and hot water supply device operates according to the operation plan, there is a problem that the operation satisfying the DR implementation requirement cannot be performed.

The present invention has been made in view of these points, and an object of the present invention is to provide a hot water storage type hot water supply device capable of responding to an actual DR implementation request from an electric power company.

The hot water storage type hot water supply device according to the present invention includes a tank that stores hot water, a boiling device that heats water and stores hot water in the tank, and a boiling device that stores heat in the tank after the boiling operation is started. It is equipped with a control device that controls the boiling device so that the integrated heat storage amount reaches the target heat storage amount, and when the control device receives the DR implementation request regarding the adjustment of the power consumption amount transmitted from the electric power company, the control device receives it on the day of reception. The boiling operation is controlled according to the DR implementation request.

According to the present invention, since the boiling operation on the day of DR is controlled according to the DR implementation request, it is possible to respond to the actual DR implementation request from the electric power company.

It is a figure which shows the structure of the hot water storage type hot water supply apparatus which concerns on Embodiment 1. FIG. It is a functional block diagram which shows an example of the structure of the control device and the communication device of the hot water storage type hot water supply device which concerns on Embodiment 1. FIG. It is a Moriel diagram of the heat pump circuit of the hot water storage type hot water supply device which concerns on Embodiment 1. FIG. It is a figure which shows an example of the heat consumption schedule in the hot water storage type hot water supply apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows the flow of operation of the hot water storage type hot water supply device which concerns on Embodiment 1 at night. It is a flowchart which shows the flow of the operation time prediction processing of FIG. It is a flowchart which shows the flow of the daytime operation in the hot water storage type hot water supply device which concerns on Embodiment 1. FIG. It is a figure which shows the boiling schedule at the time of carrying out raising DR in which the 1st daytime boiling control is selected of FIG. It is a flowchart which shows the 1st daytime boiling control of FIG. It is a figure which shows the change of the integrated heat storage amount at the time of performing the 1st daytime boiling control of FIG. It is a figure which shows the change of the instantaneous power consumption at the time of performing the 1st daytime boiling control of FIG. It is a figure which shows the boiling schedule at the time of carrying out the lower DR in which the 2nd daytime boiling control is selected of FIG. It is a flowchart which shows the 2nd daytime boiling control of FIG. It is a figure which shows the change of the integrated heat storage amount at the time of performing the 2nd daytime boiling control of FIG. It is a figure which shows the change of the power consumption at the time of performing the 2nd daytime boiling control of FIG. FIG. 7 is a diagram showing a boiling schedule when the third daytime boiling control of FIG. 7 is selected and DR is not performed. It is a flowchart which shows the 3rd daytime boiling control of FIG. It is a figure which shows the change of the integrated heat storage amount at the time of carrying out the 3rd daytime boiling control of FIG. It is a figure which shows the change of the power consumption at the time of carrying out the 3rd daytime boiling control of FIG. It is a figure which shows the display example of the remote control of the hot water storage type hot water supply device which concerns on Embodiment 1. FIG. It is a functional block diagram which shows an example of the structure of the control device of the hot water storage type hot water supply device which concerns on Embodiment 2, and the external communication terminal.

Embodiment 1.
"Constitution"
The configuration of the first embodiment will be described with reference to FIG. 1 showing the basic configuration.
FIG. 1 is a diagram showing a configuration of a hot water storage type hot water supply device according to the first embodiment.

(Configuration of hot water storage type hot water supply device for each unit)
This hot-water storage type hot-water supply device boil and store hot water in the midnight hours when the unit price of contracted electricity for each time zone is low and in the daytime hours when demand response (hereinafter referred to as DR) is carried out. The stored hot water is used for hot water supply. Hereinafter, the boiling performed in the midnight time zone is referred to as the night boiling, and the boiling performed in the daytime time zone is referred to as the daytime boiling. The midnight time zone is, for example, from 23:00 to 7:00. The daytime time zone is, for example, from 7:00 to 23:00.

The hot water storage type hot water supply device includes a hot water storage unit 100 including a tank 10 for storing hot water, a tank-side pump 11, and the like, and a heat pump unit 200 as a heating means for heating the hot water in the tank 10. The tank-side pump 11 and the heat pump unit 200 of the hot water storage unit 100 constitute a boiling device A that heats water and stores hot water in the tank 10. Further, the hot water storage type hot water supply device includes a remote controller 300 for remotely controlling the hot water storage type hot water supply device, a control device 400 for sending instructions to the hot water storage unit 100 and the heat pump unit 200, and a communication device 500 for communicating with an electric power company. The hot water storage unit 100 is connected to the bathtub unit 600 having the bathtub 601 by a bathtub going pipe 61 and a bathtub returning pipe 60.

[Structure of bathtub unit 600]
The bathtub unit 600 includes a bathtub 601 and a bathtub circulation pump 62.

(Bathtub)
The bathtub 601 can store hot water at, for example, around 40 ° C. by remote control operation. The bathtub 601 is connected to the water-water heat exchanger 12 via the bathtub return pipe 60 and the bathtub outbound pipe 61. Further, the bathtub 601 has a drain plug 601a. When time has passed and the bath heat is dissipated in the bathroom and the hot water temperature drops, the hot water in the upper part of the tank 10 and the hot water in the bathtub 601 are heat-exchanged by the water-water heat exchanger 12 to add heat. It can be burned.

(Bathtub circulation pump 62)
The bathtub circulation pump 62 is provided on the bathtub return pipe 60, and circulates the bathtub water between the water-water heat exchanger 12 and the bathtub 601 via the bathtub return pipe 60 and the bathtub outbound pipe 61 at the time of reheating. Is.

[Structure of heat pump unit 200]
The heat pump unit 200 can, for example, boil low-temperature water at about 9 ° C. to a high temperature of about 90 ° C. without an electric heater. The heat pump unit 200 includes a compressor 21 having a variable rotation speed, a refrigerant-water heat exchanger 22, an expansion valve 23, an outdoor heat exchanger 24, and an outdoor heat exchanger fan 25. The drive of each of these devices is controlled by the control device 400. As the refrigerant circulating in the heat pump unit 200, R32, fluorocarbon, carbon dioxide, or the like can be used.

(Compressor 21)
The compressor 21 adjusts the flow rate of the refrigerant by changing the rotation frequency to control the heating capacity. The compressor 21 is connected to the outdoor heat exchanger 24 on the suction side and to the refrigerant-water heat exchanger 12 on the discharge side. The control device 400 calculates the optimum value for the target heating capacity for each boiling control.

(Outdoor heat exchanger 24)
The outdoor heat exchanger 24 is an air-cooled heat exchanger that exchanges heat between the air sent from the outdoor heat exchanger fan 25 and the refrigerant, and evaporates the refrigerant in a gas-liquid state by the heat of the air. The refrigerant inlet side of the outdoor heat exchanger 24 is connected to the expansion valve 23, and the refrigerant outlet side is connected to the compressor 21.

(Refrigerant-water heat exchanger 22)
The refrigerant-water heat exchanger 22 heats the hot water in the tank 10, and is connected to the tank 10 by the heat pump water inlet pipe 70 and the heat pump hot water outlet pipe 71. A heat pump circuit including a compressor 21, an outdoor heat exchanger 24, and an expansion valve 23 is connected to the refrigerant-water heat exchanger 22. In the refrigerant-water heat exchanger 22, the refrigerant in the heat pump circuit and the hot water supplied from the tank 10 flow as countercurrents that flow in opposite directions. The refrigerant-water heat exchanger 22 exchanges heat between the refrigerant in the heat pump circuit and the hot water supplied from the tank 10 to heat the hot water to a target temperature (for example, 65 to 90 ° C.).

(Outdoor heat exchanger fan 25)
The outdoor heat exchanger fan 25 is arranged in front of the outdoor heat exchanger 24 and sends air to the outdoor heat exchanger 24 to promote heat exchange between the air and the refrigerant. The rotation speed of the fan is determined by the control device 400.

[Structure of hot water storage unit 100]
The hot water storage unit 100 includes a hot water storage tank 10, a tank-side pump 11, a water-water heat exchanger 12, a hot water supply end 13 provided in a kitchen or a washroom, and water supply that supplies tap water into the hot water storage unit 100. It has an end 14 and a plurality of valves.

(Hot water storage tank 10)
The hot water storage tank 10 (hereinafter referred to as a tank 10) stores boiling water. A hot water supply pipe 73 that communicates with the hot water supply pipe 72 is connected to the upper part of the tank 10. A heat pump water inlet pipe 70 and a tank water supply pipe 77 are connected to the lowermost part of the tank 10. Further, the tank 10 is connected to a boiling circuit, a hot water supply circuit, a hot water filling circuit, and a reheating circuit. The configuration of each circuit will be described later.

(Tank side pump 11)
The tank-side pump 11 is provided on the heat pump water inlet pipe 70. The tank-side pump 11 circulates the hot water in the tank 10 between the refrigerant-water heat exchanger 22 and the tank 10 via the heat pump water inlet pipe 70 and the heat pump hot water outlet pipe 71 to boil the water. Further, the tank-side pump 11 circulates the hot water in the tank 10 between the water-water heat exchanger 12 and the tank 10 via the hot water introduction pipe 75 and the first hot water outlet pipe 76a to perform reheating. is there.

(Water-water heat exchanger 12)
The water-water heat exchanger 12 heats the hot water of the bathtub 601 and is composed of a tube-type or plate-type heat exchanger. The tube-type heat exchanger includes, for example, a spiral heat exchanger. Plate-type heat exchangers include, for example, plate-type heat exchangers. The water-water heat exchanger 12 is connected to the upper part of the tank by the hot water introduction pipe 75, and is connected to the lowermost part of the tank by the first hot water outlet pipe 76a via the three-way valve 83. A bathtub circulation circuit for circulating hot water in the bathtub 601 is connected to the water-water heat exchanger 12 by a bathtub circulation pump 62, and the hot water in the bathtub 601 passes through the water-water heat exchanger 12. The water-water heat exchanger 12 exchanges heat between the hot water of the bathtub 601 that circulates in the bathtub circulation circuit and the hot water in the tank 10 led from the hot water introduction pipe 75, and heats the hot water of the bathtub 601. The hot water in the bathtub 601 is kept warm or reheated.

(Bath hot water mixing valve 80)
The bath hot water supply mixing valve 80 is provided on a hot water filling pipe 78 that is branched from the hot water supply pipe 72 and communicates with the bathtub going pipe 61. The bath hot water supply mixing valve 80 controls the hot water filling temperature by adjusting the mixing ratio of the high temperature water from the hot water supply pipe 72 and the tap water from the water supply end 14 by changing the opening degree of the valve.

(Hot water filling on-off valve 81)
The hot water filling on-off valve 81 is provided on the hot water filling pipe 78, and switches between starting and stopping the hot water filling in the bathtub 601 by opening and closing.

(General hot water mixing valve 82)
The general hot water supply mixing valve 82 is provided on the general hot water supply pipe 79 which is branched from the hot water supply pipe 72 and communicates with the hot water supply end 13. The general hot water supply mixing valve 82 adjusts the mixing ratio of the high temperature water from the hot water supply pipe 72 and the tap water from the water supply end 14 by changing the opening degree of the valve, and controls the hot water discharge temperature.

(Three-way valve and four-way valve)
The three-way valve 83 is a flow path switching means having an inlet a port and a b port and an outlet c port. The three-way valve 83 is configured so that the flow path can be switched between the two paths ac and bc.

The three-way valve 84 is a flow path switching means having an inlet a port and a b port and an outlet c port. The three-way valve 84 is configured so that the flow path can be switched between the two paths ac and bc. The first water supply pipe 74a is connected to the a port of the three-way valve 84. A medium hot water pipe 90 is connected to the b port of the three-way valve 84. A second water supply pipe 74b is connected to the c port of the three-way valve 84.

The first water supply pipe 74a connected to the a port of the three-way valve 84 has an inlet end connected to the water supply end 14 and an outlet end connected to the a port of the three-way valve 84. The other end of the tank water supply pipe 77, one end of which is connected to the lower part of the tank, is connected to the first water supply pipe 74a. The medium-temperature water pipe 90 connected to the b port of the three-way valve 84 has an inlet end connected to an intermediate portion in the vertical direction of the tank 10 and an outlet end connected to the b port of the three-way valve 84. The inlet end of the second hot water outlet pipe 76b is connected to the medium hot water pipe 90, and the outlet end of the second hot water outlet pipe 76b is connected to the first hot water outlet pipe 76a.

The four-way valve 85 is a flow path switching means having an inlet a port and a b port and an outlet c port and d port. The four-way valve 85 is configured so that the flow path can be switched between the four paths of ac, ad, bc, and bd. A water pipe 91 is connected to the a port of the four-way valve 85, a heat pump hot water pipe 71 is connected to the b port, a first hot water pipe 92 is connected to the c port, and a second hot water pipe 93 is connected to the d port.

The four-way valve 86 is a flow path switching means having an inlet a port and an outlet b port, c port, and d port. The four-way valve 86 is configured so that the flow path can be switched between the three paths of ab, ac, and ad. The second hot water pipe 93 is connected to the a port of the four-way valve 86, the third hot water pipe 94 is connected to the b port, the fourth hot water pipe 95 is connected to the c port, and the fifth hot water pipe 96 is connected to the d port.

[Various sensors]
The hot water storage type hot water supply device is equipped with various sensors. Hereinafter, each sensor will be described.

(Hot water storage temperature sensor)
The hot water storage temperature sensors 1a to 1d are arranged at intervals in the vertical direction of the tank 10. From the detected temperatures of the hot water storage temperature sensors 1a to 1d, the temperature distribution in the vertical direction in the tank 10 can be known, and how much heat remains in the tank 10 can be grasped. The temperature information from the hot water storage temperature sensors 1a to 1c is sent to the control device 400, and the control device 400 instructs the heat pump unit 200 and the hot water storage unit 100 to continue boiling until the amount of heat stored in the tank 10 reaches the target amount. put out.

(Incoming water temperature sensor 2, hot water temperature sensor 3)
The water entry temperature sensor 2 is attached to the heat pump water inlet pipe 70 or the inlet of the refrigerant-water heat exchanger 22, and detects the water temperature before heating by the refrigerant-water heat exchanger 22 by a thermistor sensor or the like. The hot water temperature sensor 3 is attached to the hot water discharge pipe 71 of the heat pump or the outlet of the refrigerant-water heat exchanger 22, and detects the hot water temperature after heating by the refrigerant-water heat exchanger 22 by a thermistor sensor or the like. The temperature information from the incoming water temperature sensor 2 and the hot water temperature sensor 3 is sent to the control device 400, and the control device 400 is sent to the hot water storage unit 100 so that the hot water temperature after heating reaches the target hot water temperature and the flow rate of the hot water is adjusted. Gives instructions.

(Bathtub temperature sensor 4, bathtub going temperature sensor 5)
The bathtub temperature sensor 4 detects the temperature of the bathtub water flowing into the water-water heat exchanger 12 via the bathtub return pipe 60. The temperature information from the bathtub temperature sensor 4 is sent to the control device 400, and when the bathtub water becomes lower than the user-set temperature, the control device 400 instructs the hot water storage unit 100 and the bathtub unit 600 to start the reheating operation. put out. The bathtub going temperature sensor 5 detects the temperature of the bathtub water flowing out of the water-water heat exchanger 12 and flowing to the bathtub 601 through the bathtub going pipe 61. The temperature information from the bathtub going pipe 61 is sent to the control device 400, and the control device 400 instructs the hot water storage unit 100 and the bathtub unit 600 so that the heated bathtub water reaches the user-set temperature at the time of reheating.

FIG. 2 is a functional block diagram showing an example of the configuration of the control device and the communication device of the hot water storage type hot water supply device according to the first embodiment.

(Communication device 500)
The communication device 500 includes a receiving unit 50 and a transmitting unit 51. The receiving unit 50 receives the DR implementation request from the electric power company. Further, the receiving unit 50 receives the operation information described later, which is a response to the DR execution request, from the control device 400. The transmission unit 51 transmits the DR execution information in the DR execution request received by the reception unit 50 to the control device 400. Further, the transmission unit 51 transmits the operation information received by the reception unit 50 to the electric power company.

(Control device 400)
The control device 400 controls each part provided in the hot water storage type hot water supply device. The control device 400 includes an information acquisition unit 40, an arithmetic processing unit 41, an equipment control unit 42, a communication unit 43, a timer 44, and a storage unit 45. The control device 400 realizes various functions by executing software on an arithmetic unit such as a microcomputer. Alternatively, the control device 400 may be composed of hardware such as a circuit device that realizes various functions.

The information acquisition unit 40 acquires information detected by various sensors such as the water inlet temperature sensor 2, the hot water outlet temperature sensor 3, the hot water storage temperature sensors 1a to 1d, the bathtub going temperature sensor 5, and the bathtub temperature sensor 4. Further, the information acquisition unit 40 acquires DR execution information from the communication device 500.

The arithmetic processing unit 41 processes each flowchart described later based on various information acquired by the information acquisition unit 40. In the processing of each flowchart described later, the target heat storage amount at night, the target heat storage amount during the daytime, the expected time when the hot water runs out, the low capacity boiling start time, the cumulative heat storage amount of the hot water currently stored in the tank 10, etc. Make a calculation. These calculations will be described again.

The equipment control unit 42 includes a compressor 21, an expansion valve 23, a three-way valve 83, a three-way valve 84, a four-way valve 85, a four-way valve 86, a bath hot water supply mixing valve 80, and a hot water filling, depending on the processing result of the arithmetic processing unit 41. It controls the on-off valve 81, the general hot water supply mixing valve 82, the tank side pump 11, and the bathtub circulation pump 62.

The communication unit 43 is connected to the remote controller 300 and transmits / receives information to / from the remote controller 300.

The timer 44 counts the current time, and when the set time is reached, outputs a signal indicating that the set time is reached. For example, each time described later calculated by the arithmetic processing unit 41 is set in the timer 44.

The storage unit 45 stores various values used in each unit of the control device 400. The storage unit 45 stores the target heat storage amount at night, the target heat storage amount during the daytime, the expected time when the hot water runs out, the low capacity boiling start time, the cumulative heat storage amount of the hot water stored in the tank 10 at the present time, and the like.

(Remote control 300)
The remote controller 300 transmits and receives signals to and from the control device 400. The remote controller 300 is provided with a function that allows the user to set the hot water supply temperature, a function that allows the temperature and amount of hot water to be discharged to the bathtub 601 to be set, a function that allows the reheating temperature of the bathtub water to be set, and the like. Further, the remote controller 300 is provided with a display unit such as a liquid crystal panel, and the current setting information or the like can be displayed on the display unit.

"circuit"
Next, the circuit formed in the present embodiment will be described.

(Heat pump circuit)
The heat pump circuit is provided in the heat pump unit 200, and includes a compressor 21, a refrigerant-water heat exchanger 22, an expansion valve 23, and an outdoor heat exchanger 24, and is a circuit in which the refrigerant circulates.

(Boiling circuit)
The boiling circuit is formed by opening the three-way valve 83 in the a-c direction, opening the four-way valve 85 in the dd direction, and further opening the four-way valve 86 in the a-d direction. The boiling circuit communicates from the bottom of the tank 10 to the refrigerant-water heat exchanger 22 via the heat pump water inlet pipe 70, and heat pump hot water pipe 71, the second hot water pipe 93, the fourth hot water pipe 95, and hot water supply. It is a circuit connected to the upper part of the tank via the pipe 73.

(Hot water supply circuit)
The hot water supply circuit consists of a circuit that communicates from the upper part of the tank to the general hot water supply mixing valve 82 via the hot water supply pipe 73 and the hot water supply pipe 72, and a three-way valve opened from the water supply end 14 in the first water supply pipe 74a and ac direction. It has a circuit that communicates with the general hot water supply mixing valve 82 via the 84 and the second water supply pipe 74b, and a circuit that communicates from the general hot water supply mixing valve 82 to the hot water supply end 13 via the general hot water supply pipe 79.

(Hot water filling circuit)
The hot water filling circuit has a circuit that communicates from the upper part of the tank to the bath hot water supply mixing valve 80 via the hot water supply pipe 73 and the hot water supply pipe 72. Further, the hot water filling circuit includes a circuit connected from the water supply end 14 to the lower part of the tank via the tank water supply pipe 77, a three-way valve 84 opened from the water supply end 14 in the first water supply pipe 74a, ac direction, and the like. It has a circuit that communicates with the bath hot water supply mixing valve 80 via the second water supply pipe 74b. The hot water filling circuit further includes a circuit that connects the hot water supply mixing valve 80 to the bathtub 601 via the hot water filling pipe 78, the hot water filling on-off valve 81, and the bathtub going pipe 61.

(Reheating circuit)
The reheating circuit is formed by opening the three-way valve 83 in the ab direction. The reheating circuit is a circuit that communicates from the upper part of the tank to the water-water heat exchanger 12 via the hot water introduction pipe 75 and connects to the lowermost part of the tank via the first hot water outlet pipe 76a.

(Bathtub circulation circuit)
The bathtub circulation circuit is a circuit having a water-water heat exchanger 12, a bathtub circulation pump 62, and a bathtub 601 connected by a bathtub return pipe 60 and a bathtub outbound pipe 61. Bathtub water is circulated in the bathtub circulation circuit by the bathtub circulation pump 62.

≪Basic driving operation≫
The basic operation of the hot water storage type hot water supply device will be described with reference to FIG.

(Boiling operation)
The boiling operation is started by instructing the boiling device A to start the operation from the control device 400. In the boiling operation, the heat pump unit 200 and the tank side pump 11 are driven. In the heat pump unit 200, the compressor 21 is activated and the refrigerant circulates in the heat pump circuit. The refrigerant discharged after being compressed by the compressor 21 flows into the refrigerant-water heat exchanger 22 and exchanges heat with the hot water sent from the tank 10 to be cooled. The cooled refrigerant is depressurized by the expansion valve 23 and then flows into the outdoor heat exchanger 24. The refrigerant that has flowed into the outdoor heat exchanger 24 exchanges heat with the air from the outdoor heat exchanger fan 25 to be heated, and then returns to the compressor 21.

On the other hand, by driving the tank-side pump 11, the water at the bottom of the tank is sent to the refrigerant-water heat exchanger 22 via the heat pump inlet pipe 70 in the boiling circuit, and the target hot water temperature is exchanged with the refrigerant in the heat pump circuit. It is boiled up to produce hot water. The generated hot water is returned to the upper part of the tank via the heat pump hot water outlet pipe 71, the second hot water water pipe 93, and the third hot water water pipe 94. As the boiling progresses, the upper part of the tank 10 becomes hot water, and the lowermost part of the tank becomes low temperature water across the temperature boundary layer. At the end of boiling, the amount of boiling increases, the area of hot water at the top of the tank becomes large, the temperature boundary layer approaches the bottom of the tank, and the temperature of hot water entering the heat pump unit 200 through the heat pump water supply pipe 70 gradually rises. ..

(Hot water supply operation)
The hot water supply operation is started according to the operation of using hot water at the hot water supply end 13. In the hot water supply operation, in the hot water supply circuit, the hot water stored in the tank 10 is led out from the upper part of the tank or the middle part of the tank according to the use of the hot water at the hot water supply end 13, and is sent to the general hot water supply mixing valve 82. Low-temperature tap water is guided from the water supply end 14 to the general hot water supply mixing valve 82 via the first water supply pipe 74a, mixed with the hot water from the tank 10 to set the set temperature, and the faucet is set from the hot water supply end 13. It is supplied to the load side such as. The low-temperature water supplied from the water supply end 14 is automatically supplied into the tank from the lowermost part of the tank via the first water supply pipe 74a in accordance with the decrease in the amount of hot water drawn out from the upper part of the tank. By supplying tap water into the tank from the bottom of the tank in this way, the temperature boundary layer moves upward in the tank 10.

(Hot water filling operation)
The hot water filling operation is started by operating the remote controller 300. At this time, the hot water filling on-off valve 81 is opened. In the hot water filling operation, the hot water drawn from the upper part of the tank is sent to the bath hot water supply mixing valve 80 in the hot water filling circuit. Low-temperature tap water is guided from the water supply end 14 to the bath hot water supply mixing valve 80 via the first water supply pipe 74a, mixed with hot water from the tank 10 and adjusted to an appropriate temperature, and a hot water filling on-off valve. It is supplied to the bathtub 601 through 81, and hot water filling is performed. The hot water filling is stopped when the water level of the bathtub 601 reaches the set value. The water level of the bathtub 601 is detected by a water level sensor (not shown) installed in the water level bathtub circulation circuit. The water level sensor detects the water level by measuring the pressure change with the pressure sensor mounted on the water level sensor.

(Reheating operation)
The reheating operation is forcibly or automatically started by the user's operation. When the reheating operation is started, the operation of the tank side pump 11 and the bathtub circulation pump 62 is started.

In the reheating operation, the high temperature water led out from the upper part of the tank in the reheating circuit is guided to the water-water heat exchanger 12. Further, substantially at the same time as this timing, the hot water stored in the bathtub 601 is guided to the water-water heat exchanger 12 through the bathtub return pipe 60.

In the water-water heat exchanger 12, heat is exchanged between the hot water from the tank system and the hot water from the bathtub system, and the hot water in the tank system whose temperature is lowered by applying heat to the bathtub system is the first hot water. It returns to the tank 10 through the lead-out pipe 76a. Further, the hot water of the bathtub system whose temperature has risen after receiving the heat in the water-water heat exchanger 12 returns to the bathtub 601 through the bathtub going pipe 61.

When the control device 400 detects that the bathtub water temperature detected by the bathtub temperature sensor 4 has reached the target bathtub temperature, the control device 400 issues a reheating stop command to operate the bathtub circulation pump 62 and the tank side pump 11. Stop it. As described above, in the reheating operation, the operation of raising the bathtub water in the bathtub 601 to the target bathtub temperature is performed.

《Frozen cycle》
FIG. 3 is a Moriel diagram of the heat pump circuit of the hot water storage type hot water supply device according to the first embodiment. In FIG. 3, the horizontal axis is enthalpy H [kJ / kg]. The vertical axis is the pressure P [MPa].
The pressure and enthalpy of the refrigerant compressed by the compressor 21 flow into the refrigerant-water heat exchanger 22 and change from x1 to x2 in the refrigerant-water heat exchanger 22. In the refrigerant-water heat exchanger 22, the refrigerant exchanges heat with the water sent from the tank 10, and is cooled to a maximum of near the water entry temperature (for example, 9 ° C.) into the refrigerant-water heat exchanger 22, and the enthalpy is reduced. It changes from h1 to h2. In the refrigerant-water heat exchanger 22, water is heated to near the inlet temperature of the refrigerant to the refrigerant-water heat exchanger 22. The pressure and enthalpy of the refrigerant flowing into the expansion valve 23 change from x2 to x3 in the expansion valve 23. In the expansion valve 23, the refrigerant is depressurized and changes to a gas-liquid state.

The pressure and enthalpy of the refrigerant flowing out of the expansion valve 23 and flowing into the outdoor heat exchanger 24 changes from x3 to x4 in the outdoor heat exchanger 24. In the outdoor heat exchanger 24, the refrigerant exchanges heat with the air sent by the outdoor heat exchanger fan 25 and evaporates, changing to a gas phase state, and the enthalpy changes from h2 to h4.

The pressure and enthalpy of the refrigerant flowing out of the outdoor heat exchanger 24 and flowing into the compressor 21 changes from x4 to x1 in the compressor 21. In the compressor 21, the refrigerant vapor heated by the outdoor heat exchanger 24 is compressed, and the enthalpy of the refrigerant changes from h4 to h1. The refrigerant vapor whose pressure has risen reaches the supercritical region and flows into the refrigerant-water heat exchanger 22 again.

"motion"
The main operations of this embodiment will be described.

The main operations of the present embodiment include a night-time boiling operation in which the above-mentioned boiling operation is performed at a predetermined nighttime, and a daytime boiling operation in which the above-mentioned boiling operation is performed in the daytime after nighttime. The outline of each operation will be described below with an example of a daily heat consumption schedule.

FIG. 4 is a diagram showing an example of a heat consumption schedule in the hot water storage type hot water supply device according to the first embodiment.
In this example, the prediction result of the daily heat consumption schedule from 23:00 to 23:00 the next day is shown. It is predicted that the hot water supply load will start to occur at 7:00 on the load side and the hot water will be filled at 19:00. In FIG. 4, Qt ₁ is the amount of heat that is expected to be consumed on the load side before and during hot water filling, that is, from 7:00 to 19:00. Qt ₂ is the amount of heat that is expected to be consumed after filling with hot water, that is, between 19:00 and 23:00.

In the hot water storage type hot water supply device, heat is stored in the tank 10 by the night boiling operation, the amount of heat stored is consumed by hot water supply and hot water filling on the load side in the daytime, and then the heat is stored again by the daytime boiling operation. The amount of heat stored is used for reheating after filling with hot water. Therefore, in the night boiling operation, the heat storage amount Qt ₁ predicted to be consumed on the load side from 7:00 to the time of filling with hot water is set as the target heat storage amount (hereinafter referred to as the nighttime target heat storage amount Qt ₁ ), and the nighttime target heat storage amount is set. Heat is stored in the tank 10 having a quantity of Qt ₁ . The boiling operation Day, the target heat storage amount the amount of heat Qt ₂ predicted to be consumed by the load side after hot water filling the next day 23:00 (hereinafter, Day referred target heat storage amount Qt ₂₎ and, daytime target heat storage Heat is stored in the tank 10 of the amount Qt ₂ .

The daytime boiling operation is a boiling operation performed during the daytime period from 7:00 on the day of DR to the time of filling with hot water. There are three control patterns for the daytime boiling operation, which are different in operation start timing, heating capacity, etc., first daytime boiling control, second daytime boiling control, and third daytime boiling control. It is controlled according to the control pattern selected accordingly. Each control pattern will be described later.

Here, the DR implementation request transmitted from the electric power company will be described. There are two types of DR implementation requests: raised DR and lowered DR.

(1) Raised DR
Raised DR is a request from the electric power company to instruct the hot water storage type water heater to increase the power consumption to the target adjustment amount in order to increase the power demand.

(2) Lower DR
Lower DR is a request from an electric power company to instruct a hot water storage type water heater to reduce power consumption in order to reduce power demand. After transmitting the DR implementation request for the lowered DR to the hot water storage type hot water supply device, the electric power company sends the end of the lowered DR to the hot water storage type hot water supply device when it is no longer necessary to reduce the power consumption due to the power usage status.

《Control flow》
FIG. 5 is a flowchart showing a flow of nighttime operation of the hot water storage type hot water supply device according to the first embodiment. FIG. 6 is a flowchart showing the flow of the operation time prediction process of FIG. An outline will be described here, and details will be described later.
The control device 400 of the hot water storage type hot water supply device performs an operation time prediction process for predicting various times required for the next day's operation at 23:00, which is a fixed time at night (step S1), and then performs night boiling control (step). Perform steps S2 to S5). Hereinafter, the operation time prediction process and the night boiling control will be described in order.

(Driving time prediction processing)
As shown in FIG. 6, the control device 400 sets the nighttime target heat storage amount Qt ₁ and the daytime target heat storage amount Qt ₂ based on the load history (step A1). The nighttime target heat storage amount Qt ₁ and the daytime target heat storage amount Qt ₂ may be set as follows. That is, the amount of heat storage required for the next day is calculated based on the load history, and this is set as the target amount of heat storage Qt. Then, the ratio is determined based on the actual load in the daytime from 23:00 to the time of filling with hot water and the actual load in the nighttime from 23:00 to 23:00, and based on the ratio and the target heat storage amount Qt. The nighttime target heat storage amount Qt ₁ and the daytime target heat storage amount Qt ₂ are set.

Here, for example, when the inside of the tank is temporarily filled up in the night boiling operation, when the DR implementation request received from the electric power company in the daytime of the next day is a raised DR, there is a possibility that the request cannot be met. That is, if the power consumption is increased in the daytime boiling operation in order to respond to the increased DR, the DR implementation request cannot be met when the excess heat storage exceeds the full storage. In the first embodiment, as described above, the nighttime target heat storage amount Qt ₁ and the daytime target heat storage amount Qt ₂ are set based on the load history so as to be able to respond to any DR implementation request. Here, since it is premised that the daytime boiling is performed in addition to the nighttime heating as the daily operation schedule, the nighttime target heat storage amount Qt ₁ is set to the tank 10 so as to meet the DR implementation request of the raised DR. It is not set to the amount of heat to be stored.

Next, the control device 400 consumes the nighttime target heat storage amount Qt ₁ and the load history, and the estimated time when the hot water runs out in the tank 10 is predicted to occur, in other words, the nighttime target heat storage amount Qt ₁ is all consumed. The estimated time when the hot water runs out is calculated (step A2). The time when the hot water runs out is not limited to the time when the target heat storage amount Qt ₁ at night is expected to be consumed, and the hot water filling time predicted based on the load history may be set. Next, the control device 400 should start the operation to store the daytime target heat storage amount Qt ₂ in the tank 10 in the low-capacity operation described later performed in the third daytime boiling control by the expected time when the hot water runs out. (Hereinafter, referred to as the low-capacity boiling start time) is calculated (step A3). The low-capacity boiling start time is a time ahead of the estimated time when the hot water runs out calculated in step A2 by the time required to boil the daytime target heat storage amount Qt ₂ in the low-capacity operation.

Then, the control device 400 boiled at night from the preset heating capacity for nighttime, the nighttime target heat storage amount Qt _1, and the time when it was predicted that the heat amount consumption would start on the load side (7:00 in this case). The time to start the raising operation (hereinafter referred to as the night boiling start time) is calculated (step A4). The nighttime boiling operation starts at 7:00, when it is predicted that heat consumption will start on the load side, and is advanced by the time required to boil the nighttime target heat storage amount Qt ₁ with the nighttime heating capacity. It is the time when If the night boiling operation is started immediately at 23:00 when the operation time prediction process is performed, there is a possibility that too much time will be left before 7:00 when the hot water is actually used, and heat dissipation loss will occur. Therefore, the night boiling start time is calculated.

Subsequently, the control device 400 creates operating information that can be utilized as reference information when the electric power company makes a DR implementation request for the raised DR (step A5). Specifically, the operation information is the operation time t ₀ of the daytime boiling operation when the first daytime boiling control described later is selected. The operating time t ₀ is calculated by the following formula based on the daytime target heat storage amount Qt ₂ and the preset assumed heating capacity Φ ₀ [kW].

t ₀ = Qt ₂ / Φ ₀
In addition, Φ ₀ is set to, for example, the heating capacity at the time of boiling at night.

The control device 400 transmits the calculated operation information to the electric power company via the communication device 500 (step A6). The heating capacity Φ ₀ used for calculating the operation time t ₀ is not the actual heating capacity at the time of the actual first daytime boiling control but the assumed heating capacity. Therefore, the operation information transmitted to the electric power company in step A6 is only the predicted operation time.

After the above operation time prediction process, the control device 400 enters the night boiling control. That is, as shown in FIG. 5, the control device 400 waits for the night boiling start time calculated by the operation time prediction process (NO in step S2), and when the night boiling start time is reached (YES in step S2), the boiling occurs. A signal instructing the start of boiling is transmitted to the raising device A to start the night boiling operation (step S3).

After starting the night boiling operation, the control device 400 calculates the nighttime cumulative heat storage amount for each control interval (for example, every minute) (NO in step S4), and the nighttime cumulative heat storage amount becomes the nighttime target heat storage amount Qt ₁ . When it reaches (YES in step S4), the boiling device A is made to perform a night boiling operation (step S5).

Here, the nighttime cumulative heat storage amount is calculated as follows. The control device 400 calculates the amount of heat stored in the tank 10 based on the detected temperatures of the hot water storage temperature sensors 1a to 1d at the start of the night boiling operation. Then, the heat storage amount of the tank 10 is calculated based on the detected temperatures of the hot water storage temperature sensors 1a to 1d for each control interval, and the heat storage amount at the start of the night boiling operation is subtracted from the calculated heat storage amount to accumulate heat storage. The amount is calculated.

The operation time prediction process and night boiling control have been described above. Next, the control of the hot water storage type hot water supply device according to the DR implementation request received from the electric power company will be described. In addition, the electric power company creates a DR implementation request for adjusting the electric energy with reference to the operation information received from the hot water storage type hot water supply device in step A6 of FIG. 6, and transmits it to the hot water storage type hot water supply device. The timing at which the DR implementation request is transmitted from the electric power company varies depending on the power usage situation of the day, and is decided by the electric power company. When the hot water storage type hot water supply device receives a DR implementation request from the electric power company, it selects a control pattern according to the DR implementation request and performs a daytime boiling operation.

FIG. 7 is a flowchart showing the flow of daytime operation in the hot water storage type hot water supply device according to the first embodiment. The processing of the flowchart of FIG. 7 is performed at each control interval.
When the control device 400 receives the DR execution request (YES in step S11), the control device 400 selects a control pattern according to the DR execution request, and performs a daytime boiling operation on the DR day according to the selected control pattern (steps S12 to step S12). S14). Specifically, when the DR execution request is raised DR, the first daytime boiling control is selected (step S13), and when the DR execution request is lowered DR, the second daytime boiling control is selected (step S14). .. On the other hand, when the preset time is reached without receiving the DR execution request, specifically, the low-capacity boiling start time calculated in step A3 of FIG. 6 (NO in step S11, step S15). Yes), the third daytime boiling control is selected (step S16). If the DR execution request is not received and the low-capacity boiling start time is not reached (NO in step S11, NO in step S15), no processing is performed and the processing of the flowchart of FIG. 7 ends.

The outline of each daytime boiling control will be described below.

(1st daytime boiling control)
The first daytime boiling control is the control selected when the DR implementation request is raised DR. As described above, the increase DR is a request to increase the power consumption amount to the target adjustment amount in order to increase the power demand. Therefore, in the first daytime boiling control, the boiling operation is controlled so that the power consumption amount becomes the target adjustment amount in order to meet the demand.

(Second daytime boiling control)
The second daytime boiling control is the control selected when the DR implementation request is lowered DR. The lower DR is a request issued for the purpose of reducing the power demand as described above. Therefore, in the second daytime boiling control, the boiling operation is stopped from the time when the lower DR is instructed until the end of the lower DR is received, in response to the request for reducing the power demand, and the end of the lower DR is received. After that, control is performed to start the boiling operation.

(3rd daytime boiling control)
The third daytime boiling control is a control selected when there is no DR execution request by the low capacity boiling start time. The fact that the DR implementation request was not sent from the electric power company is considered to mean that the supply and demand balance of electric power is balanced. For this reason, in the third daytime boiling control, as a control that suppresses the increase in the amount of demand to the maximum so as not to disturb the balance between supply and demand of electric power, the boiling is performed in low capacity operation with less power consumption than in the nighttime boiling operation. Do the action.

As low-capacity operation, for example, a method of boiling with a heating capacity of Φ _low reduced by a set ratio from the heating capacity for nighttime, or a method of boiling to the target hot water temperature at the minimum rotation speed on the device of the tank side pump 11. A method of controlling the boiling device A is conceivable. In the flowchart described later, the case where the former method is implemented is shown as an example.

Next, the specific flow of each daytime boiling control will be described. Table 1 summarizes the control outline of each daytime boiling control. Table 1 shows the control target, the target value, the start timing, the end timing, the power consumption amount, and the operation time for each daytime boiling control. Please refer to Table 1 as appropriate in the following description.

(1st daytime boiling control)
FIG. 8 is a diagram showing a boiling schedule at the time of performing raising DR in which the first daytime boiling control of FIG. 7 is selected. FIG. 9 is a flowchart showing the first daytime boiling control of FIG. 7. FIG. 10 is a diagram showing a change in the integrated heat storage amount when the first daytime boiling control of FIG. 9 is performed. In FIG. 10, the horizontal axis is the time and the vertical axis is the integrated heat storage amount [kJ]. FIG. 11 is a diagram showing a change in instantaneous power consumption when the first daytime boiling control of FIG. 7 is executed. In FIG. 11, the horizontal axis represents time and the vertical axis represents instantaneous power consumption [kW]. 8 to 11 show an example in which a DR execution request is received at 11:00. Further, in this example, as shown in FIGS. 10 and 11, the implementation period of the raising DR performed by the electric power company is from 11:00 to 16:00.

When the control device 400 receives the DR execution request of the raised DR from the electric power company via the communication device 500 at 11:00, the control device 400 starts the processing of the flowchart of FIG. That is, the control device 400 sets the power consumption amount as the target adjustment amount as the control target value (step C1), transmits a signal instructing the boiling device A to start boiling, and starts the daytime boiling operation. (Step C2).

Here, the signal instructing the start of boiling also includes the target adjustment amount as the control target value. As a result, in the boiling device A, the compressor frequency is controlled so that the power consumption of the heat pump unit 200 and the hot water storage unit 100 becomes the target adjustment amount, and the boiling operation is performed. In the boiling operation, the frequency of the tank-side pump 11 is controlled so that the hot water temperature detected by the hot water temperature sensor 3 reaches the target hot water temperature. By controlling the frequency of the tank-side pump 11, the flow rate of water entering the heat pump can be adjusted, and the hot water temperature can be adjusted. Therefore, the hot water temperature can be separated from the adjustment of the target hot water temperature and the control of the compressor frequency, and the compressor frequency is controlled so that the power consumption becomes the target adjustment amount.

After the start of the daytime boiling operation in step C2, the control device 400 transmits the operation information to the electric power company as a response to the DR execution request of the raising DR (step C3). Specifically, the operation information is the operation time t ₁ of the hot water storage type hot water supply device required to store the target daytime heat storage amount Qt ₂ with the current heating capacity Φ ₁ [kW]. The operating time t ₁ is calculated by the following formula based on the daytime target heat storage amount Qt ₂ and the current heating capacity Φ ₁ [kW].

t ₁ = Qt ₂ / Φ ₁

The current heating capacity Φ ₁ is the value of the swelling by adjusting the water entry temperature and the compressor frequency, and is calculated by the following formula.
Φ ₁ = (Two-Twi) × Cp × V
Two [° C.]: Detected temperature of the hot water temperature sensor 3 Twi [° C.]: Detected temperature of the incoming water temperature sensor 2 Cp [kJ / kg ° C]: Specific heat of water V [kg / s]: From the rotation speed of the tank side pump 11. Required water flow rate

Since the operating time t ₁ calculated here is calculated based on the current heating capacity Φ ₁ , it is a time more in line with the actual operating conditions than the operating time t ₀ calculated in step A5 of FIG. .. In this way, by transmitting the newly recalculated operation time t ₁ using the current heating capacity Φ ₁ to the electric power company as operation information, it is expected that the electric power company can achieve the target adjustment amount. More accurate driving information can be obtained as effective reference information when setting up.

After starting the daytime boiling operation, the control device 400 calculates the daytime cumulative heat storage amount for each control interval, and if the daytime cumulative heat storage amount does not reach the daytime target heat storage amount Qt ₂ (NO in step C4), boiling Let the raising device A continue the daytime boiling operation. On the other hand, if the integrated daytime heat storage amount reaches the daytime target heat storage amount Qt ₂ (YES in step C4), a signal instructing the boiling stop is transmitted to the boiling device A to end the daytime boiling operation (step). C5).

As described above, in the first daytime boiling control, the daytime boiling operation is started in response to the DR execution request of the DR at 11:00 as shown in FIG. 8, and the integration is performed from 11:00 as shown in FIG. The amount of heat storage has increased, and the target amount of heat storage Qt ₂ in the daytime has been reached at 13:00 after the operation time t ₁ (2 hours in this example). Further, as shown in FIG. 11, the power consumption amount is adjusted to the target adjustment amount.

As shown in FIGS. 10 and 11, even during the raising DR between 11:00 and 16:00, when the daytime cumulative heat storage amount reaches the daytime target heat storage amount Qt ₂ , the daytime Stop the boiling operation. On the other hand, if the raising DR implementation period ends during the daytime boiling operation, the daytime boiling operation is continued until the daytime target heat storage amount Qt ₂ is achieved.

(Second daytime boiling control)
FIG. 12 is a diagram showing a boiling schedule at the time of lowering DR in which the second daytime boiling control of FIG. 7 is selected. FIG. 13 is a flowchart showing the second daytime boiling control of FIG. 7. FIG. 14 is a diagram showing a change in the integrated heat storage amount when the second daytime boiling control of FIG. 13 is executed. In FIG. 14, the horizontal axis is the time and the vertical axis is the integrated heat storage amount [kJ]. FIG. 15 is a diagram showing changes in power consumption when the second daytime boiling control of FIG. 7 is executed. In FIG. 15, the horizontal axis is time and the vertical axis is instantaneous power consumption [kW]. In addition, FIGS. 12 to 15 show an example in the case where the DR execution request is received at 11:00. Further, in this example, as shown in FIGS. 14 and 15, the implementation period of the lowered DR performed by the electric power company is from 11:00 to 18:00.

When the control device 400 receives the DR execution request for the lowered DR from the electric power company via the communication device 500 at 11:00, the control device 400 starts the processing of the flowchart of FIG. That is, the control device 400 transmits the operation information to the electric power company (step D1) as a response to the DR execution request of the lowered DR, and then enters the reception waiting state of the end of the lowered DR (NO in step D2). The operation information is specifically a declaration of shutdown.

While waiting for reception at the end of the lowered DR, the hot water storage type hot water supply device is stopped without operating. Then, when the control device 400 receives the lower DR end at 18:00 (YES in step D2), the control device 400 heats the daytime integrated heat storage amount so that it reaches the daytime target heat storage amount Qt ₂ from the present time to the estimated time when the hot water runs out. Adjust the capacity to control the boiling operation. Specifically, first, the control device 400 calculates the heating capacity Φ ₂ [kW] required to store the target daytime heat storage amount Qt ₂ from the present time to the estimated time when the hot water runs out (step D3). The heating capacity Φ ₂ is calculated by the following formula.

Φ ₂ = Qt ₂ / t ₂
t ₂ [s]: Expected time when hot water runs out-current time

The control device 400 sets the heating capacity to the heating capacity Φ ₂ calculated in step D3 as a control target value (step D4). Then, the control device 400 transmits a signal instructing the boiling device A to start boiling to start the daytime boiling operation (step D5). The signal instructing the start of boiling includes a heating capacity Φ ₂ as a control target value. Thus, the boiling apparatus A heating capacity performs control to boiling operation the compressor frequency such that the heating capacity [Phi _2.

In the boiling operation, the frequency of the tank-side pump 11 is controlled so that the hot water temperature detected by the hot water temperature sensor 3 reaches the target hot water temperature. By controlling the frequency of the tank-side pump 11, the flow rate of water entering the heat pump can be adjusted, and the hot water temperature can be adjusted. Therefore, the control of compressor frequency and tapping temperature and adjust the target hot water temperature, it is possible to separate the control of the compressor frequency is merely heating capacity is carried out such that the heating capacity [Phi _2.

After starting the daytime boiling operation, the control device 400 calculates the daytime cumulative heat storage amount for each control interval, and if the daytime cumulative heat storage amount does not reach the daytime target heat storage amount Qt ₂ (NO in step D6), the daytime cumulative heat storage amount is calculated. Continue the boiling operation. On the other hand, if the integrated daytime heat storage amount reaches the daytime target heat storage amount Qt ₂ (YES in step D6), the control device 400 transmits a signal instructing the boiling device A to stop boiling and the daytime boiling operation. (Step D7).

As described above, the second daytime boiling control is the control selected when the DR execution request is lowered and the DR is lowered, and the operation is stopped between 11:00 and 18:00 to consume as shown in FIG. The power is zero. Then, as shown in FIG. 12, the integrated heat storage amount and the power consumption amount increase as shown in FIGS. 14 and 15 by starting the daytime boiling operation after receiving the lower DR end at 18:00. The daytime cumulative heat storage amount reaches the daytime target heat storage amount Qt ₂ after the operation time t ₂ (1 hour in this example), that is, at 19:00, which is the expected time when the hot water runs out. In this way, in the second daytime boiling control, while responding to the DR implementation request for the lowered DR, the heating capacity is adjusted to store the daytime target heat storage amount Qt ₂ in the tank 10 by the expected time when the hot water runs out. ..

(3rd daytime boiling control)
FIG. 16 is a diagram showing a boiling schedule when the third daytime boiling control of FIG. 7 is selected and DR is not performed. FIG. 17 is a flowchart showing the third daytime boiling control of FIG. 7. FIG. 18 is a diagram showing a change in the integrated heat storage amount when the third daytime boiling control of FIG. 17 is executed. In FIG. 18, the horizontal axis is the time and the vertical axis is the integrated heat storage amount [kJ]. FIG. 19 is a diagram showing a change in power consumption when the third daytime boiling control of FIG. 7 is executed. In FIG. 19, the horizontal axis is time and the vertical axis is instantaneous power consumption [kW].

The control device 400 starts processing the flowchart of FIG. 17 at the low-capacity boiling start time of 16:00. That is, the control unit 400 as a control target value, to set the heating capacity to the heating capacity [Phi ₃ (step E1). Here, the heating capacity Φ ₃ is set to the heating capacity Φ _low , which is reduced by a set ratio from the heating capacity for nighttime as described above.

Subsequently, the control device 400 transmits a signal instructing the boiling device A to start boiling to start the daytime boiling operation (step E2). The signal instructing the start of boiling includes a heating capacity Φ _low as a control target value. As a result, the boiling device A controls the compressor frequency so that the heating capacity Φ ₃ becomes the heating capacity Φ _low, and performs the boiling operation in the low capacity operation.

In the boiling operation, the tank-side pump 11 is operated at a frequency lower than that of the first and second daytime boiling controls so that the hot water temperature detected by the hot water temperature sensor 3 reaches the target hot water temperature. As a result, the flow rate of water entering the heat pump unit 200 decreases. Therefore, even if the heating capacity of the heat pump unit 200 is set to a heating capacity of Φ _low , which is lower than that of the first and second daytime boiling controls, the refrigerant-water heat exchanger 22 The temperature of the hot water after passing through is not lowered, and can be set to the same temperature as the first and second daytime boiling control.

After starting the daytime boiling operation, the control device 400 calculates the daytime cumulative heat storage amount for each control interval, and if the daytime cumulative heat storage amount does not reach the daytime target heat storage amount Qt ₂ (NO in step E3), boiling Let the raising device A continue the daytime boiling operation. On the other hand, if the integrated daytime heat storage amount reaches the daytime target heat storage amount Qt ₂ (YES in step E3), the control device 400 transmits a signal instructing the boiling device A to stop boiling and the daytime boiling operation. (Step E4).

As described above, in the third daytime boiling control, as shown in FIG. 18, the operation is started at 16:00, which is the low capacity boiling start time. That is, the operation is started at the low capacity boiling start time corresponding to the final time when the operation should be started in order to store the daytime target heat storage amount Qt ₂ in the tank 10 by the expected time when the hot water runs out with the low heating capacity Φ _low. .. After the start of operation, the cumulative amount of heat storage in the daytime increases, and the target amount of heat storage in the daytime Qt ₂ is reached after the operation time t ₃ (3 hours in this example), that is, at 19:00, which is the expected time when the hot water runs out. Further, in the third daytime boiling control, by performing the low-capacity operation, as is clear by comparing FIG. 19 with FIGS. 11 and 15, as compared with the first and second daytime boiling controls, The power consumption is low.

(Remote control display)
FIG. 20 is a diagram showing a display example of a remote controller of the hot water storage type hot water supply device according to the first embodiment.
During the first daytime boiling control and the second daytime boiling control, the control device 400 performs "DR compatible mode display" on the display unit 301 of the remote controller 300 to the effect that the control is being performed in response to the DR implementation request. , Make the user aware that the DR compatible mode is in progress. In this example, an example of displaying the message "DR compatible mode in progress" is shown as "DR compatible mode display", but the display example is not limited to this. The display period of the "DR compatible mode display" is from the start to the end of the boiling operation after receiving the DR execution request if the DR execution request is a raised DR. Further, the display period of the "DR compatible mode display" is from the reception of the DR execution request to the end of the boiling operation if the DR execution request is a lowered DR.

"effect"
As described above, the hot water storage type hot water supply device of the first embodiment includes a tank 10 for storing hot water, a boiling device A for heating water and storing hot water in the tank 10, and a boiling device A for boiling water. It is provided with a control device 400 that controls the boiling device A so that the integrated heat storage amount stored in the tank 10 after the start of the raising operation reaches the target heat storage amount. When the control device 400 receives the DR execution request for adjusting the power consumption transmitted from the electric power company, the control device 400 controls the boiling operation on the day of reception according to the DR execution request.

In this way, when the DR implementation request is received from the electric power company, the boiling operation on the day of reception is controlled according to the DR implementation request, so that the actual DR implementation request from the electric power company can be met.

In the first embodiment, the control device 400 has a nighttime target heat storage amount in the nighttime boiling operation performed at a predetermined nighttime and a daytime target in the daytime boiling operation performed in the daytime after nighttime based on the load history. Set the amount of heat storage. The control device 400 controls the night-time boiling operation so that the night-time integrated heat storage amount after starting the night-time boiling operation reaches the nighttime target heat storage amount, and starts the daytime boiling operation while responding to the DR implementation request. The daytime boiling operation is controlled so that the accumulated heat storage amount during the daytime reaches the target heat storage amount during the daytime.

This makes it possible to respond to any DR implementation request. Therefore, from the perspective of the electric power company, it is easy to adjust the power demand balance.

In the first embodiment, the control device 400 starts a night boiling operation based on a nighttime target heat storage amount, a preset nighttime heating capacity, and a time when it is predicted that heat consumption will start on the load side. At the time, the night boiling operation is started.

As a result, heat dissipation loss can be reduced.

In the first embodiment, the control device 400 predicts the operation time of the daytime boiling operation based on the daytime target heat storage amount and the preset assumed heating capacity, and transmits the predicted operation time to the electric power company.

As a result, from the viewpoint of the electric power company, it is possible to obtain reference information for estimating the demand amount of electric power.

In the first embodiment, if the DR implementation request is a raised DR that indicates a target adjustment amount that is a target of the power consumption of the hot water storage type hot water supply device, the power consumption of the hot water storage type hot water supply device is daytime. The daytime boiling operation is controlled so as to reach the target adjustment amount of.

As a result, a contract is made between the electric power company and the customer who has a hot water storage type hot water supply device to pay the customer a reward from the electric power company by consuming electricity according to the DR implementation request of the raised DR. If this is done, the consumer side can get a price advantage. In addition, from the perspective of the electric power company, it becomes easy to adjust the balance between supply and demand of power consumption because the target adjustment amount of electricity is consumed on the consumer side.

In the first embodiment, if the integrated daytime heat storage amount reaches the daytime target heat storage amount during the raising DR, the control device 400 ends the daytime boiling operation.

As a result, it is possible to prevent unnecessary heat storage from being performed even during the raising DR.

In the first embodiment, the control device 400 transmits to the electric power company the operating time, which is the time required to store the target daytime heat storage amount in the tank 10 with the current heating capacity, as a response to the DR implementation request of the raised DR. ..

As a result, from the viewpoint of the electric power company, more accurate information can be obtained as reference information for estimating how much the target adjustment amount can be achieved during the implementation of the raising DR.

In the first embodiment, if the DR implementation request is a lowered DR instructing a reduction in the power consumption of the hot water storage type hot water supply device, the control device 400 performs a daytime boiling operation until the end of the lowered DR is received from the electric power company. After stopping and receiving the end of lowering DR, the boiling operation is started.

In this way, by starting the daytime boiling operation after the implementation of the lowering DR is completed, the electric power company can suppress the peak demand when the electric power demand is tight.

In the first embodiment, in the boiling operation after receiving the end of the lower DR, the control device 400 has a daytime target heat storage amount by the expected time when the hot water in the tank 10 is expected to run out. Adjust the heating capacity to reach the amount.

As a result, the risk of running out of hot water can be reduced.

In the first embodiment, the control device 400 transmits an operation stop declaration to the electric power company as a response to the DR implementation request of the lowered DR.

As a result, the electric power company can obtain reference information for estimating how much the electric power demand can be suppressed during the reduction DR.

In the first embodiment, if the control device 400 does not receive the DR execution request by the preset time, the daytime target heat storage amount becomes the tank 10 in the low capacity operation in which the power consumption is smaller than that in the night boiling operation. Control the daytime boiling operation so that heat is stored.

If there is no DR implementation request by the preset time in this way, the supply and demand balance of electric power is balanced. Therefore, by boiling in low-capacity operation, the increase in electric power can be minimized, and electric power. It is possible to suppress the imbalance between supply and demand. Since the power consumption is reduced by performing low-capacity operation, there is an advantage that the electricity charge can be suppressed for the user of the hot water storage type hot water supply device. Further, in the low-capacity operation, the operation time required for boiling the daytime target heat storage amount Qt ₂ becomes long, so that the boiling start time becomes earlier than the first and second daytime boiling controls. Therefore, even if an unexpected hot water supply load suddenly occurs in the daytime, the risk of running out of hot water can be reduced.

In the first embodiment, the control device 400 causes the remote controller 300 that operates the hot water storage type hot water supply device to indicate that the DR execution request is being supported during the control according to the DR execution request.

From this, it can be seen that the user of the hot water storage type hot water supply device participates in DR.

By the way, there is a case where an electric power company purchases electric power by solar power generation (hereinafter referred to as PV power generation) from a contractor. When such a contract is established, the hot water storage type hot water supply device of the first embodiment can be used within the jurisdiction of the electric power company to balance the supply and demand by adjusting the demand. Therefore, the electric power company can avoid the situation such as suspension of purchase due to excessive power generation of PV power generation, and from the viewpoint of the contractor who is performing PV power generation, it is possible to avoid the situation where the reward for selling the PV power generation power cannot be obtained. ..

Embodiment 2.
FIG. 21 is a functional block diagram showing an example of the configuration of the control device and the external communication terminal of the hot water storage type hot water supply device according to the second embodiment. Hereinafter, the second embodiment will be described focusing on the differences from the first embodiment.
In the first embodiment, the hot water storage type hot water supply device includes the communication device 500, and the control device 400 transmits / receives DR execution information and operation information to and from the electric power company via the communication device 500. On the other hand, in the second embodiment, the hot water storage type hot water supply device does not include the communication device 500, and uses the communication device 800 of the external communication terminal 700 connected so as to be able to send and receive information to and from the hot water storage type hot water supply device. It was configured to communicate with the electric power company. The external communication terminal 700 is, for example, any of a HEMS controller, a smartphone, and a PC.

The hot water storage type hot water supply device of the second embodiment configured as described above acquires the DR implementation information from the electric power company via the external communication terminal 700, and transmits the operation information to the electric power company via the external communication terminal 700.

According to the second embodiment, in addition to the same effect as that of the first embodiment, the cost of the device is increased by omitting the communication device 500 from the device configuration of the hot water storage type hot water supply device and substituting the communication device 800 of the external communication terminal 700. You can go down.

1a Hot water storage temperature sensor, 1b Hot water storage temperature sensor, 1c Hot water storage temperature sensor, 1d Hot water storage temperature sensor, 2 Water inlet temperature sensor, 3 Outflow temperature sensor, 4 Bath temperature sensor, 5 Bath going temperature sensor, 10 Tank, 11 Tank side pump, 12 Water heat exchanger, 13 Hot water supply end, 14 Water supply end, 21 Compressor, 22 Water heat exchanger, 23 Expansion valve, 24 Outdoor heat exchanger, 25 Outdoor heat exchanger fan, 40 Information acquisition unit, 41 Arithmetic processing unit, 42 Equipment control unit, 43 Communication unit, 44 Timer, 45 Storage unit, 50 Receiver unit, 51 Transmitter unit, 60 Bathtub return pipe, 61 Bathtub going pipe, 62 Bathtub circulation pump, 70 Heat pump water inlet pipe, 71 Heat pump hot water supply pipe, 72 Hot water supply pipe, 73 Hot water supply pipe, 74a 1st water supply pipe, 74b 2nd water supply pipe, 75 Hot water introduction pipe, 76a 1st hot water outlet pipe, 76b 2nd hot water outlet pipe, 77 Tank water supply pipe, 78 Hot water filling pipe, 79 General hot water supply piping, 80 bath hot water supply mixing valve, 81 hot water filling on-off valve, 82 general hot water supply mixing valve, 83 three-way valve, 84 three-way valve, 85 four-way valve, 86 four-way valve, 90 medium-temperature water piping, 91 water piping, 92 first Hot water piping, 93 2nd hot water piping, 94 3rd hot water piping, 95 4th hot water piping, 96 5th hot water piping, 100 hot water storage unit, 200 heat pump unit, 300 remote control, 301 display, 400 control device, 500 communication device, 600 tub unit, 601 tub, 601a drain plug, 700 external communication terminal, 800 communication device, A boiling device.

Claims (15)

A tank that stores hot water and
A boiling device that heats water and stores hot water in the tank, and a boiling device that performs a boiling operation.
A control device for controlling the boiling device so that the integrated heat storage amount stored in the tank after starting the boiling operation reaches the target heat storage amount is provided.
The control device is a hot water storage type hot water supply device that controls the boiling operation on the day of reception in response to the DR execution request when it receives a DR execution request for adjusting the power consumption transmitted from the electric power company. Based on the load history, the control device sets a nighttime target heat storage amount in the nighttime boiling operation performed at a predetermined nighttime time and a daytime target heat storage amount in the daytime boiling operation performed in the daytime after the nighttime. ,
The night-time boiling operation is controlled so that the night-time cumulative heat storage amount after starting the night-time boiling operation reaches the nighttime target heat storage amount.
The hot water storage type hot water supply device according to claim 1, wherein the daytime boiling operation is controlled so that the daytime cumulative heat storage amount after starting the daytime boiling operation reaches the daytime target heat storage amount while responding to the DR implementation request. .. The control device sets the night-time boiling at the night-time boiling start time based on the night-time target heat storage amount, the preset night-time heating capacity, and the time when the load side predicts that the heat consumption will start. The hot water storage type hot water supply device according to claim 2, wherein the operation is started. The control device predicts the operation time of the daytime boiling operation based on the daytime target heat storage amount and a preset assumed heating capacity, and transmits the predicted operation time to the electric power company. Alternatively, the hot water storage type hot water supply device according to claim 3. In the control device, when the DR implementation request is a raised DR that indicates a target adjustment amount that is a target of the power consumption amount in the hot water storage type hot water supply device, the power consumption amount becomes the target adjustment amount. The hot water storage type hot water supply device according to any one of claims 2 to 4, which controls the daytime boiling operation. The hot water storage type hot water supply according to claim 5, wherein the control device terminates the daytime boiling operation when the daytime integrated heat storage amount reaches the daytime target heat storage amount during the raising DR. apparatus. A claim that the control device transmits to the electric power company an operating time, which is the time required to store the daytime target heat storage amount in the tank with the current heating capacity, in response to the DR implementation request of the raised DR. The hot water storage type hot water supply device according to 6. When the DR implementation request is a lowered DR instructing a reduction in the power consumption of the hot water storage type hot water supply device, the control device stops the daytime boiling operation until the end of the lowered DR is received from the electric power company. The hot water storage type hot water supply device according to any one of claims 2 to 7, wherein the daytime boiling operation is started after receiving the lowering DR end. In the daytime boiling operation after receiving the end of the lowered DR, the control device sets the daytime integrated heat storage amount to the daytime target heat storage amount by the time when the hot water out of the tank is predicted to occur. The hot water storage type hot water supply device according to claim 8, which is subordinate to claim 2 in which the heating capacity is adjusted so as to reach. The hot water storage type hot water supply device according to claim 8 or 9, wherein the control device transmits an operation stop declaration to the electric power company in response to the DR execution request of the lowered DR. If the control device does not receive the DR execution request by a preset time, the daytime target heat storage amount is stored in the tank in a low-capacity operation in which the power consumption is smaller than that during the night-time boiling operation. The hot water storage type hot water supply device according to any one of claims 2 to 10, wherein the daytime boiling operation is controlled as described above. The control device according to claim 1 to 11, wherein the display unit of the remote controller that operates the hot water storage type hot water supply device is displayed to indicate that the DR execution request is being supported during control in response to the DR execution request. The hot water storage type hot water supply device according to any one item. The hot water storage type hot water supply device according to any one of claims 1 to 12, further comprising a communication device that communicates with the electric power company and transmits the DR implementation request to the control device. The hot water storage type hot water supply device according to any one of claims 1 to 13, wherein the control device receives the DR implementation request from the electric power company via a communication device provided in an external communication terminal. The hot water storage type hot water supply device according to claim 14, wherein the external communication terminal is any of a HEMS controller, a smartphone, and a PC.

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