Hot water supply system

Abstract

To provide a hot water supply system enabling improvement of convenience of a user.SOLUTION: A hot water system 100 includes a tank 21 and a control section 190. The control section 190 controls an operation of a water heater 1 that performs a boiling-up operation for heating hot water in the tank 21. The control section 190 receives a demand response request. When a hot water delivery command is issued in a first period that is set on the basis of the demand response request and in which electric power consumption is suppressed, the control section 190 determines whether or not to respond to the hot water delivery command.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] Regarding hot water systems. [Background technology]

[0002] A mechanism for adjusting the balance between supply and demand of electricity has been known in the past, whereby electricity suppliers (electric power companies) request demand response (DR) from electricity consumers regarding the consumption or reduction of electricity, and electricity consumers then adjust their electricity consumption.

[0003] When a DR request for power reduction (a downward DR request) is received, the hot water storage type water heater performs planned heating operation during time periods other than the time periods based on the downward DR request, and stores the heated water in the hot water storage tank. The hot water storage type water heater also dispenses the stored hot water based on a hot water dispensing instruction from the user. The hot water dispensing instruction is, for example, an instruction to start a bath filling operation.

[0004] Patent Document 1 (JP 2019-105984 A) discloses an equipment control device that changes the setting conditions of an air conditioner to setting conditions desired by a user while demand response control corresponding to a downward DR request is being performed. The user selects the desired setting conditions from one or more setting conditions displayed by the equipment control device. Summary of the Invention [Problem to be solved by the invention]

[0005] A hot water storage type water heater performs planned heating operation and stores heated water in a hot water storage tank in advance. Therefore, the timing of hot water discharge and the timing of heating operation differ. Therefore, the device control device of Patent Document 1, which requires the user to make a selection, may reduce user convenience.

[0006] The present disclosure provides a hot water supply system that improves user convenience. [Means for solving the problem]

[0007] A hot water supply system according to a first aspect includes a tank and a control unit. The control unit controls the operation of the hot water supply device, which performs a boiling operation to heat hot water in the tank. The control unit receives a demand response request. When a hot water supply instruction is received during a first period during which power consumption is reduced, which is set based on the demand response request, the control unit determines whether to comply with the hot water supply instruction.

[0008] Prohibiting hot water from being dispensed during the first period reduces user convenience. This configuration improves user convenience.

[0009] A hot water supply system according to a second aspect is the hot water supply system according to the first aspect, wherein the control unit determines whether or not to comply with the hot water supply instruction depending on the degree of urgency.

[0010] By determining whether to dispense hot water based on the degree of urgency, convenience for users is improved.

[0011] A hot water supply system according to a third aspect is the hot water supply system according to the second aspect, wherein the control unit determines the degree of urgency based on an operation by a user.

[0012] By determining whether to dispense hot water based on the user's operation, convenience for the user is improved.

[0013] A hot water supply system of a fourth aspect is a hot water supply system of any one of the first aspect to the third aspect, in which the control unit determines whether to comply with the hot water supply instruction based on the amount of hot water remaining in the tank and the planned amount of hot water to be dispensed based on the hot water dispense instruction.

[0014] By determining whether to dispense hot water based on the planned amount of hot water to be dispensed, convenience for the user is improved.

[0015] A hot water supply system of a fifth aspect is a hot water supply system of a fourth aspect, in which the control unit dispenses hot water in accordance with a hot water dispensing instruction when the remaining amount of hot water is smaller than a second water amount, which is the sum of the planned amount of hot water dispensed and a predetermined first water amount.

[0016] With this configuration, hot water is dispensed even when the remaining amount of hot water is less than the second amount of water, thereby improving convenience for the user.

[0017] A hot water supply system according to a sixth aspect is the hot water supply system according to the fifth aspect, wherein the control unit performs a heating operation and also dispenses hot water.

[0018] This configuration can prevent hot water from running out, improving user convenience.

[0019] A hot water supply system according to a seventh aspect is the hot water supply system according to the sixth aspect, wherein the control unit heats the hot water during the boiling operation so that the amount of remaining hot water is equal to or greater than the first amount of water.

[0020] This configuration can prevent hot water from running out, improving user convenience.

[0021] A hot water supply system according to an eighth aspect is the hot water supply system according to any one of the fifth aspect to the seventh aspect, wherein the control unit dispenses hot water at an amount equal to or less than the remaining amount of hot water.

[0022] This configuration makes it possible to respond to downward DR requests.

[0023] A hot water supply system of a ninth aspect is a hot water supply system of a fourth aspect, in which the control unit does not dispense hot water based on a hot water dispensing instruction if the remaining amount of hot water is smaller than a second water amount which is the sum of the planned amount of hot water dispensed and a predetermined first water amount.

[0024] This configuration makes it possible to respond to downward DR requests.

[0025] A hot water supply system of a tenth aspect is a hot water supply system of the first aspect, in which the control unit determines whether to comply with the hot water supply instruction based on a first time period from the scheduled hot water supply time according to the hot water supply instruction to the end time of the first period.

[0026] By determining whether to dispense hot water based on the time remaining until the end of the downward DR request period, user convenience is improved.

[0027] The hot water supply system of the eleventh aspect is the hot water supply system of the tenth aspect, in which the control unit performs boiling operation and dispenses hot water when the amount of hot water remaining in the tank is less than the planned amount of hot water dispensed based on the hot water dispense instruction and the first time is equal to or longer than the predetermined second time.

[0028] Even if the remaining amount of hot water is insufficient, hot water is dispensed if the first time is equal to or longer than the second time, thereby improving convenience for the user.

[0029] A hot water supply system of a twelfth aspect is a hot water supply system of the tenth or eleventh aspect, in which the control unit does not dispense hot water based on the hot water dispensing instruction if the amount of hot water remaining in the tank is smaller than the planned amount of hot water dispensed based on the hot water dispensing instruction and the first time is less than the specified second time.

[0030] This configuration makes it possible to respond to downward DR requests.

[0031] A hot water supply system according to a thirteenth aspect is the hot water supply system according to the eleventh or twelfth aspect, wherein the second time period is set by a user.

[0032] Such a configuration improves user convenience.

[0033] A hot water supply system according to a fourteenth aspect is the hot water supply system according to the first aspect, wherein the control unit determines whether to comply with the hot water supply instruction, depending on the operation of the hot water supply apparatus based on the hot water supply instruction.

[0034] Such a configuration improves user convenience.

[0035] A hot water supply system according to a fifteenth aspect is the hot water supply system according to the first or fourteenth aspect, wherein the control unit dispenses hot water in accordance with the hot water dispensing instruction when the planned amount of hot water dispensed based on the hot water dispensing instruction is equal to or greater than a third water amount.

[0036] Such a configuration improves user convenience.

[0037] A hot water supply system according to a sixteenth aspect is the hot water supply system according to any one of the first to fifteenth aspects, wherein the control unit controls the operation of two or more hot water supply devices. When one hot water supply device performs a boiling operation during a first period, the control unit restricts the operation of the other hot water supply devices.

[0038] This configuration makes it possible to respond to downward DR requests.

[0039] A hot water supply system of a 17th aspect is a hot water supply system of any one of the 1st to 16th aspects, in which the control unit sets the target value for power consumption reduction to a value equal to or greater than the power consumption reduction level value set based on a demand response request.

[0040] This configuration makes it possible to respond to downward DR requests.

[0041] A hot water supply system according to an eighteenth aspect is the hot water supply system according to any one of the first aspect to the seventeenth aspect, wherein the control unit limits the number of hot water supply devices that perform the boiling operation during the first period.

[0042] This configuration makes it possible to respond to downward DR requests. [Brief explanation of the drawings]

[0043] [Figure 1] FIG. 1 is a schematic diagram of a hot water supply system. [Figure 2] FIG. 2 is a functional block diagram of the hot water supply system. [Figure 3] 4 is a flowchart showing the flow of processing for determining whether hot water is to be dispensed according to the first embodiment. [Figure 4] FIG. 4 is a diagram for explaining a first water volume and a second water volume. [Figure 5] 10 is a flowchart showing the flow of processing for determining whether hot water is to be dispensed in the second embodiment. [Figure 6] 10 is a flowchart showing the flow of processing for determining whether hot water is to be dispensed in the third embodiment. [Figure 7] FIG. 10 is a functional block diagram of a hot water supply system according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0044] First Embodiment (1) Overall structure A hot water supply system 100 according to a first embodiment will be described with reference to the drawings.

[0045] The hot water supply system 100 adjusts the power consumption of the commercial power system in response to a demand response request (hereinafter, sometimes referred to as a DR request).

[0046] Demand response is when a user (customer) receiving power from a commercial power system adjusts the power consumption of the commercial power system in response to a request from an aggregator 90 such as an electric power company that supplies power from the commercial power system. The aggregator 90 pays the user a remuneration as compensation for the demand response, depending on the amount of adjustment of the power consumption of the commercial power system.

[0047] Fig. 1 is a schematic configuration diagram of a hot water supply system 100. As shown in Fig. 1, the hot water supply system 100 mainly includes a heat pump unit 110, a hot water storage unit 120, a remote controller 130, and a control unit 190. A hot water supply unit 140, a bathtub 150, and a stop valve 160 are connected to the hot water storage unit 120.

[0048] The heat pump unit 110 heats hot water supplied from the hot water storage unit 120 and supplies the heated hot water to the hot water storage unit 120. The hot water storage unit 120 stores the heated hot water supplied from the heat pump unit 110, mixes the stored hot water with water supplied from a stop valve 160, and supplies the mixed water to the hot water supply unit 140 and the bathtub 150. The heat pump unit 110 and the hot water storage unit 120 constitute a hot water supply device 1 that boils hot water in a hot water storage tank (tank) 21 included in the hot water storage unit 120. The hot water supply unit 140 is, for example, a faucet and a shower. The stop valve 160 is connected to an external water supply source such as a water line. The stop valve 160 is operated to supply water to the hot water storage unit 120.

[0049] Here, "hot water" refers to at least one of hot water and cold water. Therefore, both water before being heated by the heat pump unit 110 and water after being heated by the heat pump unit 110 are referred to as hot water.

[0050] (2) Detailed configuration (2-1) Heat pump unit The heat pump unit 110 mainly includes a compressor 11, a water heat exchanger 12, an expansion valve 13, and an air heat exchanger 14. The compressor 11, the water heat exchanger 12, the expansion valve 13, and the air heat exchanger 14 are connected in a ring shape by refrigerant piping to form a heat pump cycle. The discharge side of the compressor 11 is connected to the water heat exchanger 12, and the suction side of the compressor 11 is connected to the air heat exchanger 14. One end of the expansion valve 13 is connected to the water heat exchanger 12, and the other end of the expansion valve 13 is connected to the air heat exchanger 14. The heat pump unit 110 also includes a first control device 10.

[0051] The refrigerant circulating through the heat pump cycle has a critical temperature higher than the temperature of the heated water supplied from the heat pump unit 110 to the hot water storage unit 120. The critical temperature of the refrigerant is preferably 10°C or more higher than the temperature of the heated water. Examples of refrigerants include R32 (critical temperature 78.1°C), HFO-1234yf (critical temperature 95.0°C), and R410 (critical temperature 71.4°C).

[0052] The compressor 11 has a compression mechanism that compresses the refrigerant by driving a motor 11a. The refrigerant compressed by the compressor 11 is sent to a water heat exchanger 12. The heating capacity of the heat pump unit 110 can be adjusted by controlling the operating frequency of the motor 11a.

[0053] The water heat exchanger 12 exchanges heat between the high-temperature refrigerant compressed by the compressor 11 and the hot water supplied from the hot water storage unit 120, thereby heating the hot water. The water heat exchanger 12 is, for example, a double-pipe heat exchanger consisting of an outer pipe and an inner pipe inserted inside the outer pipe. The water heat exchanger 12 may also be a plate-type heat exchanger, etc. The heating capacity of the heat pump unit 110 is, for example, the amount of heat that the water heat exchanger 12 imparts to the hot water supplied from the hot water storage unit 120 per unit time.

[0054] The expansion valve 13 reduces the pressure of the refrigerant that has passed through the water heat exchanger 12 and exchanged heat. The expansion valve 13 is, for example, an electric expansion valve. The expansion valve 13 may be a capillary tube or the like.

[0055] The air heat exchanger 14 exchanges heat between the refrigerant that has been decompressed after passing through the expansion valve 13 and outside air, thereby heating the refrigerant. Outside air is supplied to the air heat exchanger 14 by, for example, an outside air fan. The refrigerant that has passed through the air heat exchanger 14 and exchanged heat is sent to the compressor 11.

[0056] (2-2) Hot water storage unit The hot water storage unit 120 mainly comprises a hot water storage tank 21, a first drain valve 22, a water inlet valve 23, a boiling pump 24, a bypass valve 25, a boiling valve 26, a first mixing valve 27, a second mixing valve 28, a pressure reducing valve 29, a first flow rate sensor 30, a hot water filling solenoid valve 31, a second drain valve 32, a second flow rate sensor 33, a reheating pump 34, and a reheating heat exchanger 35. These elements are connected by pipes L1 to L19 through which hot water flows. Temperature sensors T1 to T10 are provided in the hot water storage tank 21 and pipes L10, L13, L14, and L16. The hot water storage unit 120 also has a second control device 20.

[0057] The hot water storage tank 21 stores hot water. Six temperature sensors T1 to T6 are provided in the hot water storage tank 21. The six temperature sensors T1 to T6 are composed of a first hot water quantity temperature sensor T1, a second hot water quantity temperature sensor T2, a third hot water quantity temperature sensor T3, a fourth hot water quantity temperature sensor T4, a fifth hot water quantity temperature sensor T5, and an upper temperature sensor T6. The upper temperature sensor T6 is provided near the upper end surface of the hot water storage tank 21. The first to fifth hot water quantity temperature sensors T1 to T5 are provided on the side of the hot water storage tank 21 at intervals from the top to the bottom.

[0058] Because the density of water changes depending on the temperature, the hot water stored in hot water storage tank 21 forms layers with higher temperatures at the top and lower temperatures at the bottom. Therefore, by detecting the temperature distribution of the hot water in hot water storage tank 21 in the vertical direction based on the output signals of temperature sensors T1 to T6, the amount of hot water in hot water storage tank 21 (amount of remaining hot water) can be obtained. The number of temperature sensors provided in hot water storage tank 21 to obtain the amount of remaining hot water in hot water storage tank 21 may be any number other than six.

[0059] One end of the water inlet pipe L1 is connected to the bottom surface of the hot water storage tank 21, and the other end of the water inlet pipe L1 is connected to the inlet side of the water heat exchanger 12 of the heat pump unit 110. A water inlet valve 23, a boiling pump 24, and a bypass valve 25 are provided in the water inlet pipe L1 from the hot water storage tank 21 toward the water heat exchanger 12. The water inlet valve 23 and the bypass valve 25 are electric three-way valves.

[0060] The first drain pipe L2 branches off from the water inlet pipe L1 between the hot water storage tank 21 and the water inlet valve 23. A first drain valve 22 is provided on the first drain pipe L2. The first drain pipe L2 is connected to a drain pipe outside the hot water storage unit 120. The first drain valve 22 is operated, for example, to discharge hot water in the hot water storage tank 21 to the outside.

[0061] One end of the hot water outlet pipe L3 is connected to the outlet side of the water heat exchanger 12 of the heat pump unit 110, and the other end of the hot water outlet pipe L3 is connected to the boiling valve 26. The boiling valve 26 is an electric three-way valve.

[0062] One end of the first return pipe L4 is connected to the boiling valve 26, and the other end of the first return pipe L4 is connected to the upper end surface of the hot water storage tank 21.

[0063] One end of the second return pipe L5 is connected to the boiling valve 26, and the other end of the second return pipe L5 is connected to the bottom end surface of the hot water storage tank 21.

[0064] One end of the bypass pipe L6 is connected to the bypass valve 25, and the other end of the bypass pipe L6 is connected to the hot water outlet pipe L3.

[0065] One end of the first boiling pipe L7 is connected to the upper end surface of the hot water storage tank 21, and the other end of the first boiling pipe L7 is connected to the first mixing valve 27. The first mixing valve 27 is an electric three-way valve.

[0066] One end of the second boiling pipe L8 is connected to the upper end surface of the hot water storage tank 21, and the other end of the second boiling pipe L8 is connected to the second mixing valve 28. The second mixing valve 28 is an electric three-way valve.

[0067] One end of the tank water supply pipe L9 is connected to a stop valve 160 outside the hot water storage unit 120, and the other end of the tank water supply pipe L9 is connected to the lower end surface of the hot water storage tank 21. A pressure reducing valve 29 is provided in the tank water supply pipe L9. The pressure reducing valve 29 is operated to adjust the pressure (water supply pressure) of the water supplied to the hot water storage unit 120 via the stop valve 160.

[0068] The branch water supply pipe L10 branches off from the tank water supply pipe L9 between the pressure reducing valve 29 and the hot water storage tank 21. The branch water supply pipe L10 branches off into a first mixed water pipe L11 and a second mixed water pipe L12. The first mixed water pipe L11 is connected to the first mixing valve 27. The second mixed water pipe L12 is connected to the second mixing valve 28. A mixed water temperature sensor T7 is provided in the branch water supply pipe L10. The mixed water temperature sensor T7 detects the temperature of the hot water flowing through the branch water supply pipe L10.

[0069] One end of the first hot water supply pipe L13 is connected to the first mixing valve 27, and the other end of the first hot water supply pipe L13 is connected to the hot water supply unit 140. A first flow rate sensor 30 is provided in the first hot water supply pipe L13. The first flow rate sensor 30 detects the flow rate of hot water in the first hot water supply pipe L13. A first hot water supply temperature sensor T8 is provided in the first hot water supply pipe L13 between the first flow rate sensor 30 and the hot water supply unit 140. The first hot water supply temperature sensor T8 detects the temperature of the hot water flowing in the first hot water supply pipe L13.

[0070] One end of the second hot water supply pipe L14 is connected to the second mixing valve 28, and the other end of the second hot water supply pipe L14 is connected to the bathtub 150. The second hot water supply pipe L14 is provided with a water filling solenoid valve 31 and a second flow rate sensor 33 from the second mixing valve 28 toward the bathtub 150. The second flow rate sensor 33 detects the flow rate of hot water and water in the second hot water supply pipe L14.

[0071] The second drain pipe L15 branches off from the second hot water supply pipe L14 between the hot water filling solenoid valve 31 and the second flow rate sensor 33. A second drain valve 32 is provided in the second drain pipe L15. The second drain pipe L15 is connected to a drain pipe outside the hot water storage unit 120. The second drain valve 32 is operated to discharge a portion of the hot water flowing through the second hot water supply pipe L14 to the outside, for example, to adjust the amount of hot water flowing through the second hot water supply pipe L14.

[0072] One end of the first bathtub return pipe L16 is connected to the bathtub 150, and the other end of the first bathtub return pipe L16 is connected to the inlet side of the reheating heat exchanger 35. A reheating pump 34 is provided in the first bathtub return pipe L16. A bathtub return temperature sensor T10 is provided in the first bathtub return pipe L16 between the bathtub 150 and the reheating pump 34. The bathtub return temperature sensor T10 detects the temperature of the hot and cold water flowing through the first bathtub return pipe L16.

[0073] One end of the second bathtub return pipe L17 is connected to the outlet side of the reheating heat exchanger 35, and the other end of the second bathtub return pipe L17 is connected to the second hot water supply pipe L14 between the second flow rate sensor 33 and the bathtub 150. A second hot water temperature sensor T9 is provided in the second hot water supply pipe L14 between the bathtub 150 and the connection point between the second bathtub return pipe L17 and the second hot water supply pipe L14. The second hot water temperature sensor T9 detects the temperature of the hot water flowing through the second hot water supply pipe L14.

[0074] The first reheating pipe L18 branches off from the second hot water supply pipe L14 between the second mixing valve 28 and the hot water filling solenoid valve 31. The first reheating pipe L18 is connected to the inlet side of the reheating heat exchanger 35.

[0075] One end of the second reheating pipe L19 is connected to the outlet side of the reheating heat exchanger 35, and the other end of the second reheating pipe L19 is connected to the water inlet valve 23.

[0076] (2-3) Remote Controller Remote controller 130 is a user interface for controlling water heating apparatus 1. Remote controller 130 is installed, for example, in the kitchen and bathroom. As shown in FIG. 2 , remote controller 130 is connected to first control device 10 and second control device 20 via wireless or wired communication to enable bidirectional data communication. Signals for instructing operation of water heating apparatus 1 are input from remote controller 130 to first control device 10 and second control device 20 via wireless or wired communication. In addition to remote controller 130, a mobile information terminal such as a smartphone may be used as a user interface for water heating apparatus 1.

[0077] The remote controller 130 includes a display unit 130a and an operation unit 130b. The display unit 130a is, for example, a liquid crystal display or an organic EL display.

[0078] Display unit 130a displays information relating to the state of water heating apparatus 1 and information relating to the settings of water heating apparatus 1. Display unit 130a displays, for example, the set value of the temperature (hot water supply temperature) of hot water supplied to hot water supply unit 140 and bathtub 150, and the amount of hot water remaining in hot water storage tank 21.

[0079] Operation unit 130b includes buttons, dials, keys, etc. that are operated by a user of water heating apparatus 1. The user of water heating apparatus 1 operates operation unit 130b to input information such as the set value for the hot water temperature. Display unit 130a may be a touch screen that also has the function of operation unit 130b.

[0080] The remote controller 130 may further include a speaker, a microphone, etc. In this case, the remote controller 130 may notify the information displayed on the display unit 130a by the speaker, and may acquire information input by the operation unit 130b via the microphone.

[0081] (2-4) Control unit The control unit 190 is mainly composed of a first control device 10 of the heat pump unit 110 and a second control device 20 of the hot water storage unit 120. The first control device 10 and the second control device 20 are typically composed of a microcomputer equipped with a control arithmetic device and a storage device, and an input / output circuit. The control arithmetic device is a processor such as a CPU or GPU. The control arithmetic device reads a control program stored in the storage device and controls the operation of the hot water supply device 1 in accordance with the control program. The control arithmetic device can write calculation results to the storage device and read information stored in the storage device in accordance with the control program.

[0082] However, the configuration of the control unit 190 is not limited to the above. For example, the first control device 10 and the second control device 20 may communicate with each other and operate cooperatively. Furthermore, instead of providing the first control device 10 and the second control device 20, a device having the functions of both the first control device 10 and the second control device 20 and provided in either the heat pump unit 110 or the hot water storage unit 120 may be provided. Such a device may be installed outside the hot water supply apparatus 1 and connected to the heat pump unit 110 and the hot water storage unit 120 via a network.

[0083] Fig. 2 is a functional block diagram of the hot water supply system 100. As shown in Fig. 2, the control unit 190 controls the compressor 11, the expansion valve 13, the water inlet valve 23, the boiling pump 24, the bypass valve 25, the boiling valve 26, the first mixing valve 27, the second mixing valve 28, the hot water filling solenoid valve 31, the reheating pump 34, and the like, based on signals from the temperature sensors T1 to T10, the first flow rate sensor 30, and the second flow rate sensor 33. The control unit 190 is also connected to the aggregator 90 via the network NW so as to be able to communicate with it.

[0084] The control unit 190 mainly performs a heating operation, a hot water supply operation, a water filling operation, and a reheating operation. The control unit 190 also has a receiving unit 191 and a DR control unit 192 as functional blocks.

[0085] (2-4-1) Heating operation The boiling operation is an operation in which the heat pump unit 110 heats the hot water in the hot water storage tank 21. In the boiling operation, the boiling pump 24 is driven to guide the hot water in the hot water storage tank 21 to the water heat exchanger 12 via the water inlet pipe L1 and heat it. The hot water heated in the water heat exchanger 12 is returned to the hot water storage tank 21 via the hot water outlet pipe L3, the first return pipe L4, and the second return pipe L5. In this way, in the boiling operation, the hot water in the hot water storage tank 21 is heated in the water heat exchanger 12 while circulating via the water inlet pipe L1, the hot water outlet pipe L3, the first return pipe L4, and the second return pipe L5.

[0086] The control unit 190 performs boiling operation by controlling the compressor 11, expansion valve 13, water inlet valve 23, boiling pump 24, bypass valve 25, and boiling valve 26. The control unit 190 controls the operating frequency of the motor 11a of the compressor 11 and the opening of the expansion valve 13 to adjust the heating capacity of the heat pump unit 110 and the temperature (outlet hot water temperature) of the hot water heated in the water heat exchanger 12. The control unit 190 controls the rotation speed of the boiling pump 24 to adjust the outlet hot water temperature, the amount of hot water remaining in the hot water storage tank 21, the flow rate (storage flow rate) of the hot water supplied to the hot water storage tank 21, etc.

[0087] In normal heating operation in which hot water is circulated in the hot water storage tank 21, the control unit 190 controls the water inlet valve 23 so that the water inlet pipe L1 does not communicate with the second reheating pipe L19, and controls the bypass valve 25 so that the water inlet pipe L1 does not communicate with the bypass pipe L6. As will be described later, the control unit 190 controls the water inlet valve 23 when performing the reheating operation.

[0088] The control unit 190 controls the bypass valve 25 to switch between a state in which the hot water flowing through the water inlet pipe L1 passes through the water heat exchanger 12 and is supplied to the hot water outlet pipe L3, and a state in which the hot water flowing through the water inlet pipe L1 bypasses the water heat exchanger 12 and is supplied to the hot water outlet pipe L3. In the state in which the water heat exchanger 12 is bypassed, the water inlet pipe L1 communicates with the bypass pipe L6, and the hot water in the hot water storage tank 21 circulates without being heated in the water heat exchanger 12.

[0089] The control unit 190 can control the boiling valve 26 to switch between a state in which hot water is supplied from the water heat exchanger 12 to the hot water storage tank 21 via the first return pipe L4, and a state in which hot water is supplied from the water heat exchanger 12 to the hot water storage tank 21 via the second return pipe L5.

[0090] The control unit 190 may acquire the outlet hot water temperature, remaining hot water volume and storage flow rate based on the operating frequency of the motor 11a of the compressor 11, the opening degree of the expansion valve 13, the rotation speed of the boiling pump 24, the state of the bypass valve 25 and the boiling valve 26, and the output signals of the temperature sensors T1 to T6 of the hot water storage tank 21.

[0091] The control unit 190 may feedback control the operating frequency of the motor 11a of the compressor 11, the opening degree of the expansion valve 13, the rotation speed of the boiling pump 24, and the state of the bypass valve 25 and the boiling valve 26 so that the outlet hot water temperature, remaining hot water amount, and storage flow rate reach predetermined target values.

[0092] Control unit 190 performs the water heating operation using power from the commercial power grid. The time period during which the water heating operation is performed may be set by the user of water heating apparatus 1 operating remote controller 130.

[0093] (2-4-2) Hot water operation Hot water supply operation is an operation in which hot water in the hot water storage tank 21 is discharged from the hot water supply unit 140. In the hot water supply operation, if the hot water supply unit 140 is a faucet, opening the faucet causes water from outside to be supplied into the hot water storage tank 21 from the bottom of the hot water storage tank 21 via the tank water supply pipe L9 due to water supply pressure. As a result, high-temperature hot water stored in the hot water storage tank 21 is pushed out from the top of the hot water storage tank 21 via the first boiling pipe L7.

[0094] High-temperature hot water is supplied from the hot water storage tank 21 to the first mixing valve 27 via the first boiling pipe L7, and water from the outside is supplied to the first mixing valve 27 via the tank water supply pipe L9, the branch water supply pipe L10, and the first mixed water pipe L11. In the first mixing valve 27, the high-temperature hot water from the first boiling pipe L7 is mixed with the water from the first mixed water pipe L11. The mixed hot water is discharged from the hot water supply unit 140 via the first hot water supply pipe L13.

[0095] When the user opens the hot water supply unit 140 and the first flow rate sensor 30 detects an increase in the flow rate of hot water in the first hot water supply pipe L13, the control unit 190 starts the hot water supply operation. During the hot water supply operation, the control unit 190 controls the first mixing valve 27 according to the temperature of the hot water supplied from the hot water supply unit 140. The control unit 190 may use the temperature detected by the first hot water supply temperature sensor T8 as the temperature of the hot water supplied from the hot water supply unit 140.

[0096] The control unit 190 may feedback control the mixing ratio of high-temperature hot water and cold water in the first mixing valve 27 based on the output signals of the mixed water temperature sensor T7 and the first hot water temperature sensor T8, etc., so that the temperature of the hot water discharged from the hot water supply unit 140 becomes a predetermined target value.

[0097] (2-4-3) Bath filling operation The bath filling operation is an operation in which hot water in the hot water storage tank 21 is supplied into the bathtub 150. In the bath filling operation, the bath filling solenoid valve 31 is opened, and water from outside is supplied into the hot water storage tank 21 from the bottom of the hot water storage tank 21 via the tank water supply pipe L9 due to the water supply pressure. As a result, the high-temperature hot water stored in the hot water storage tank 21 is pushed out from the top of the hot water storage tank 21 via the second boiling pipe L8.

[0098] High-temperature hot water is supplied from the hot water storage tank 21 to the second mixing valve 28 via the second boiling pipe L8, and water from outside is supplied to the second mixing valve 28 via the tank water supply pipe L9, the branch water supply pipe L10, and the second mixed water pipe L12. In the second mixing valve 28, the high-temperature hot water from the second boiling pipe L8 is mixed with the water from the second mixed water pipe L12. The mixed hot water is supplied into the bathtub 150 via the second hot water supply pipe L14.

[0099] When the control unit 190 receives a signal to start the hot water filling operation via the user's operation of the remote controller 130, it opens the hot water filling solenoid valve 31, and when the second flow rate sensor 33 detects an increase in the flow rate of hot water in the second hot water supply pipe L14, the control unit 190 starts the hot water filling operation. During the hot water filling operation, the control unit 190 controls the second mixing valve 28 according to the temperature of the hot water supplied to the bathtub 150. The control unit 190 may use the temperature detected by the second hot water supply temperature sensor T9 as the temperature of the hot water supplied to the bathtub 150.

[0100] The control unit 190 may feedback control the mixing ratio of high-temperature hot water and cold water in the second mixing valve 28 based on the output signals of the mixed water temperature sensor T7 and the second hot water temperature sensor T9, etc., so that the temperature of the hot water supplied into the bathtub 150 becomes a predetermined target value.

[0101] In addition, the control unit 190 may close the water filling solenoid valve 31 and end the water filling operation when it receives a signal to end the water filling operation by the user operating the remote controller 130 while the water filling operation is being performed, or when the water level in the bathtub 150 detected by a water level sensor (not shown) installed in the bathtub 150 reaches a predetermined target value.

[0102] (2-4-4) Reheating operation Reheating operation is an operation in which hot water in the bathtub 150 is heated in the reheating heat exchanger 35 and returned to the bathtub 150. In reheating operation, by driving the reheating pump 34, a portion of the hot water in the bathtub 150 is guided to the reheating heat exchanger 35 via the first bathtub return pipe L16 and heated. The hot water heated in the reheating heat exchanger 35 is returned to the bathtub 150 via the second bathtub return pipe L17 and the second hot water supply pipe L14. In this way, in reheating operation, the hot water in the bathtub 150 is heated in the reheating heat exchanger 35 while circulating via the first bathtub return pipe L16, the second bathtub return pipe L17, and the second hot water supply pipe L14.

[0103] The reheating heat exchanger 35 exchanges heat between high-temperature hot water supplied from the hot water storage tank 21 via the second hot water supply pipe L14 and the first reheating pipe L18 and low-temperature hot water supplied from inside the bathtub 150 via the first bathtub return pipe L16. In this way, the reheating heat exchanger 35 heats the hot water supplied from inside the bathtub 150 via the first bathtub return pipe L16. The high-temperature hot water supplied to the reheating heat exchanger 35 via the first reheating pipe L18 undergoes heat exchange and is then supplied to the water inlet pipe L1 via the second reheating pipe L19 and the water inlet valve 23. The reheating heat exchanger 35 may be, for example, a counterflow heat exchanger in which high-temperature hot water and low-temperature hot water flow in opposite directions to exchange heat.

[0104] When the control unit 190 receives a signal to start the reheating operation through the user's operation of the remote controller 130, it controls the water inlet valve 23 to connect the water inlet pipe L1 and the second reheating pipe L19, and drives the boiling pump 24 and the reheating pump 34 to start the reheating operation. During the reheating operation, the control unit 190 controls the rotation speed of the boiling pump 24 and the reheating pump 34 according to the temperature of the hot water in the bathtub 150 and the temperature of the hot water returned from the reheating heat exchanger 35 to the bathtub 150. The control unit 190 may use the temperature detected by the bathtub return temperature sensor T10 as the temperature of the hot water in the bathtub 150, and the temperature detected by the second hot water temperature sensor T9 as the temperature of the hot water returned from the reheating heat exchanger 35 to the bathtub 150.

[0105] The control unit 190 may feedback control the rotation speed of the boiling pump 24 and the reheating pump 34 based on the output signals of the second hot water temperature sensor T9 and the bathtub return temperature sensor T10, etc., so that the temperature of the hot water in the bathtub 150 becomes a predetermined target value.

[0106] In addition, when the control unit 190 receives a signal to end the reheating operation by the user operating the remote controller 130 while the reheating operation is being performed, or when the temperature of the hot water in the bathtub 150 reaches a predetermined target value, it may control the water inlet valve 23 so that the second reheating pipe L19 does not communicate with the water inlet pipe L1, and stop the reheating pump 34 to end the reheating operation.

[0107] (2-4-5) Receiving unit The receiver 191 receives a DR request from the aggregator 90 via the network NW. The DR request includes a downward DR request and an upward DR request.

[0108] The downward DR request is a request to reduce the power consumption of water heating apparatus 1 in a first period from the normal level. Aggregator 90 makes a downward DR request to control unit 190 before the arrival of the first period in which the power supply in the commercial power grid is predicted to be tight.

[0109] The upward DR request is a request to increase the power consumption of water heating apparatus 1 in the second period from the normal level. Aggregator 90 makes an upward DR request to control unit 190 before the second period arrives, during which excess power is predicted to be present in the commercial power grid.

[0110] The downward DR request and the upward DR request may include a target value for power consumption.

[0111] (2-4-6) DR control unit The DR control unit 192 performs control so as not to perform the boiling operation during the first period. However, as will be described later, if the DR control unit 192 determines that the boiling operation should be performed, the boiling operation is performed.

[0112] When a hot water dispense command is received during the first period, the DR control unit 192 determines whether to comply with the hot water dispense command and controls the operation of the water heater 1. In this embodiment, the signal to start the hot water filling operation is called a hot water dispense command. The user can input the urgency of the hot water dispense command by operating the remote controller 130. The planned amount of hot water dispensed for the hot water filling operation is stored in advance in a storage device.

[0113] When a hot water dispense instruction is received, the DR control unit 192 determines whether or not to comply with the hot water dispense instruction based on the urgency of the hot water dispense instruction, as shown in the flowchart of FIG.

[0114] When receiving the hot water dispensing instruction, the DR control unit 192 determines whether or not it is the first period (step S11). If it is not the first period (NO in step S11), the DR control unit 192 does not determine whether or not to comply with the hot water dispensing instruction.

[0115] If it is in the first period (YES in step S11), the DR control unit 192 determines whether the urgency is high (step S12).

[0116] If the urgency is high (YES in step S12), the DR control unit 192 determines to comply with the hot water dispense command regardless of the amount of remaining hot water (step S13). In other words, if the urgency is high, the DR control unit 192 determines to comply with the hot water dispense command even if the amount of remaining hot water is smaller than the second water volume W2. The second water volume W2 is the amount of water obtained by adding the planned amount of hot water dispensed and the predetermined first water volume W1.

[0117] Fig. 4 is a diagram for explaining the first water volume W1 and the second water volume W2. The hot water in the hot water storage tank 21 is boiled from the top of the hot water storage tank 21 toward the bottom of the hot water storage tank 21. As shown in Fig. 4, the second water volume W2 is the sum of the first water volume W1 and the planned hot water output volume, and is the volume of hot water above the dashed line G3. The remaining hot water volume is the volume of hot water above the dashed line G2.

[0118] The amount of hot water used by a faucet or shower when a user takes a bath is generally 50 liters per person. If the remaining hot water amount is less than 50 liters, there is a high possibility that the hot water will run out if the user takes a bath immediately after the bath filling operation is completed. Therefore, the predetermined first water amount W1 is, for example, 50 liters.

[0119] As shown in Figure 4, even if the remaining amount of hot water is smaller than the second water amount W2, the DR control unit 192 will start the hot water filling operation in response to the hot water dispensing command if the level of urgency is high. In this case, in order to prevent hot water shortages, the DR control unit 192 determines to perform the boiling operation so that the remaining amount of hot water after the hot water filling operation is completed is equal to or greater than the first water amount W1. The first water amount W1 is the amount of hot water above the dashed line G1. The remaining amount of hot water after the hot water filling operation is completed may also be calculated from the current remaining amount of hot water, the planned amount of hot water to be dispensed, the amount of hot water to be boiled during the boiling operation, and the amount of hot water used, etc.

[0120] On the other hand, if the level of urgency is low (NO in step S12), the DR control unit 192 determines not to comply with the hot water dispense command if the remaining amount of hot water is smaller than the second water amount W2 (YES in step S14) (step S15). Note that even if the level of urgency is low, if the remaining amount of hot water is larger than the second water amount W2 (NO in step S14), it may be determined to comply with the hot water dispense command (step S13). In this case, the DR control unit 192 may determine not to perform boiling operation during the first period.

[0121] (3) Features (3-1) Conventionally, there is known an equipment control device that changes the setting conditions of an air conditioner to a setting condition desired by a user while demand response control corresponding to a downward DR request is being performed. The user selects the desired setting condition from one or more setting conditions displayed by the equipment control device.

[0122] However, a hot water storage type water heater performs planned heating operation and stores heated water in a hot water storage tank in advance. Therefore, the hot water dispensing command is different from the heating operation command. Therefore, the device control device of Patent Document 1, which requires the user to make a selection, may reduce user convenience.

[0123] The hot water supply system 100 of this embodiment includes a hot water storage tank 21 and a control unit 190. The control unit 190 controls the operation of the hot water supply device 1, which performs a boiling operation to heat the hot water in the hot water storage tank 21. The control unit 190 receives a demand response request. When a hot water supply instruction is received during a first period during which power consumption is suppressed, which is set based on the demand response request, the control unit 190 determines whether or not to comply with the hot water supply instruction.

[0124] Prohibiting hot water from being dispensed during the first period reduces user convenience. This configuration improves user convenience.

[0125] (3-2) In hot water supply system 100 of this embodiment, control unit 190 determines whether or not to comply with a hot water supply instruction depending on the degree of urgency.

[0126] By determining whether to dispense hot water based on the degree of urgency, convenience for users is improved.

[0127] (3-3) In hot water supply system 100 of this embodiment, control unit 190 determines the degree of urgency based on the user's operation.

[0128] By determining whether to dispense hot water based on the user's operation, convenience for the user is improved.

[0129] (3-4) In hot water supply system 100 of this embodiment, control unit 190 determines whether or not to comply with a hot water dispense instruction, depending on the amount of hot water remaining in hot water storage tank 21 and the planned amount of hot water dispensed based on the hot water dispense instruction.

[0130] Generally, a hot water dispense instruction with a large planned amount of hot water dispensed is often given a high priority. By determining whether to dispense hot water based on the planned amount of hot water dispensed, convenience for the user is improved.

[0131] (3-5) In hot water supply system 100 of this embodiment, control unit 190 dispenses hot water in response to a hot water dispense command when the remaining amount of hot water is smaller than second water amount W2, which is the sum of the planned hot water dispense amount and a predetermined first water amount W1.

[0132] With this configuration, hot water is dispensed even when the remaining amount of hot water is less than the second water amount W2, improving convenience for the user.

[0133] (3-6) In the hot water supply system 100 of this embodiment, the control unit 190 performs the boiling operation and also dispenses hot water.

[0134] This configuration can prevent hot water from running out, improving user convenience.

[0135] (3-7) In the hot water supply system 100 of this embodiment, the control unit 190 heats the hot water in the boiling operation so that the amount of remaining hot water is equal to or greater than the first water amount W1.

[0136] This configuration can prevent hot water from running out, improving user convenience.

[0137] (4) Variations (4-1) Variation 1A In this embodiment, when the degree of urgency is high, the DR control unit 192 determines to comply with the hot water dispense command even if the remaining hot water amount is less than the second water amount W2. In this case, the DR control unit 192 may determine to dispense hot water equal to or less than the remaining hot water amount.

[0138] This configuration makes it possible to control the water heating operation so that it is not performed during the first period, or to reduce the amount of water heated during the water heating operation. As a result, it is possible to reduce the power consumption caused by the water heating operation and respond to a request for lower DR.

[0139] (4-2) Variation 1B In this embodiment, when the degree of urgency is low, the DR control unit 192 determines not to comply with the hot water dispense command if the remaining hot water volume is less than the second water volume W2. However, when the degree of urgency is low, the DR control unit 192 may also determine to dispense hot water at an amount equal to or less than the remaining hot water volume.

[0140] This configuration reduces the power consumption caused by the boiling operation and allows for a lower DR request to be met. In addition, the hot water supply improves user convenience.

[0141] (4-3) Variation 1C The DR control unit 192 may determine to comply with the hot water dispense command if the degree of urgency is high, regardless of the amount of remaining hot water. Also, the DR control unit 192 may determine not to comply with the hot water dispense command if the degree of urgency is low, regardless of the amount of remaining hot water.

[0142] Such a configuration eliminates the need for complex control, making it easier for the DR control unit 192 to perform control.

[0143] (4-4) Variation 1D The DR control unit 192 may determine to comply with the hot water dispense command if the remaining amount of hot water is less than the second water amount W2, regardless of the level of urgency. The DR control unit 192 may determine to dispense hot water equal to or less than the remaining amount of hot water if the remaining amount of hot water is less than the second water amount W2, regardless of the level of urgency.

[0144] Such a configuration eliminates the need for complex control, making it easier for the DR control unit 192 to perform control.

[0145] (4-5) Variation 1E The DR control unit 192 may determine not to respond to the hot water dispense instruction when the remaining amount of hot water is smaller than the second water amount W2.

[0146] This configuration makes it possible to reduce the power consumption caused by the boiling operation and to respond to requests for lower DR.

[0147] (4-6) Variation 1F In this embodiment, the DR control unit 192 compares the remaining amount of hot water with the second water amount W2 to determine whether to comply with the hot water dispense command. However, the DR control unit 192 may also compare the remaining amount of hot water with the planned amount of hot water dispensed to determine whether to comply with the hot water dispense command.

[0148] Second Embodiment A hot water supply system 200 according to the second embodiment will be described with reference to the drawings. The basic configuration and operation of the hot water supply system 200 are the same as those of the hot water supply system 100 according to the first embodiment. Below, the hot water supply system 200 according to the second embodiment will be described, focusing on the differences from the hot water supply system 100 according to the first embodiment.

[0149] The control unit 290 mainly performs a boiling operation, a hot water supply operation, a bath filling operation, and a reheating operation. The control unit 290 also has, as functional blocks, a receiving unit 291 and a DR control unit 292. The receiving unit 291 is the same as the receiving unit 191, and therefore a description thereof will be omitted.

[0150] (1) DR control unit The DR control unit 292 controls so as not to perform the boiling operation during the first period. However, as will be described later, if the DR control unit 292 determines that the boiling operation should be performed, the boiling operation is performed.

[0151] When a hot water dispense command is received during the first period, the DR control unit 292 determines whether to comply with the hot water dispense command and controls the operation of the water heater 1. In this embodiment, the signal to start the hot water filling operation is called a hot water dispense command. The planned amount of hot water dispensed in association with the hot water filling operation is stored in advance in a storage device.

[0152] When receiving a hot water dispense command, the DR control unit 292 determines whether or not to comply with the hot water dispense command depending on the first time, as shown in the flowchart of FIG.

[0153] When receiving the hot water dispensing instruction, the DR control unit 292 determines whether or not it is the first period (step S21). If it is not the first period (NO in step S21), the DR control unit 292 does not determine whether or not to comply with the hot water dispensing instruction.

[0154] If it is the first period (YES in step S21), the DR control unit 292 calculates the first time from the scheduled hot water dispense time according to the hot water dispense instruction to the end time of the first period (step S22). The scheduled hot water dispense time may be the time when the hot water dispense instruction is received or the current time.

[0155] If the first time is less than the predetermined second time and the remaining amount of hot water is less than the planned amount of hot water to be dispensed based on the hot water dispensing command (NO in step S23 and YES in step S25), the DR control unit 292 determines not to comply with the hot water dispensing command (step S26). The second time is a time set by the user and is the amount of time allowed to wait for hot water to be dispensed. The user can input the second time by operating the remote controller 130. Note that if the remaining amount of hot water is equal to or greater than the planned amount of hot water to be dispensed based on the hot water dispensing command (NO in step S25), the DR control unit 292 may determine to comply with the hot water dispensing command (step S24). In this case, the DR control unit 292 may determine not to perform boiling operation during the first period.

[0156] On the other hand, if the first time is equal to or greater than the second time (YES in step S23), the DR control unit 292 determines to comply with the hot water dispensing command regardless of the amount of remaining hot water, and starts the hot water filling operation (step S24). In other words, the DR control unit 292 determines to comply with the hot water dispensing command if the first time is equal to or greater than the second time, even if the amount of remaining hot water is less than the amount of hot water planned to be dispensed based on the hot water dispensing command. In this case, the DR control unit 292 determines to perform the boiling operation to prevent the occurrence of a hot water shortage.

[0157] (2) Features (2-1) In hot water supply system 200 of the present embodiment, control unit 290 determines whether or not to comply with the hot water dispense instruction, depending on the first time period from the scheduled hot water dispense time according to the hot water dispense instruction to the end time of the first period.

[0158] By determining whether to dispense hot water based on the time remaining until the end of the downward DR request period, user convenience is improved.

[0159] (2-2) In the hot water supply system 200 of this embodiment, the control unit 290 performs boiling operation and dispenses hot water when the amount of hot water remaining in the hot water storage tank 21 is smaller than the planned amount of hot water dispensed based on the hot water dispense command and the first time is longer than the predetermined second time.

[0160] Even if the remaining amount of hot water is small, hot water is dispensed if the first time is equal to or longer than the second time, which is the time the user can wait for hot water to be dispensed, thereby improving convenience for the user.

[0161] (2-3) In the hot water supply system 200 of this embodiment, the control unit 290 does not dispense hot water based on the hot water dispensing instruction if the amount of hot water remaining in the hot water storage tank 21 is smaller than the planned amount of hot water dispensed based on the hot water dispensing instruction and the first time is less than the specified second time.

[0162] If the first time is less than the second time, which is the time the user can wait for the hot water to be dispensed, the hot water will not be dispensed based on the hot water dispense command. This configuration reduces the power consumption caused by the boiling operation and can respond to a downward DR request.

[0163] (2-4) In the hot water supply system 200 of this embodiment, the second time period is set by the user.

[0164] This configuration allows the user to set the desired time, improving user convenience.

[0165] <Third embodiment> A hot water supply system 300 according to the third embodiment will be described with reference to the drawings. The basic configuration and operation of the hot water supply system 300 are the same as those of the hot water supply system 100 according to the first embodiment. Below, the hot water supply system 300 according to the third embodiment will be described, focusing on the differences from the hot water supply system 100 according to the first embodiment.

[0166] The control unit 390 mainly performs boiling operation, hot water supply operation, bath filling operation, hot water addition operation, and reheating operation. The control unit 390 also has, as functional blocks, a receiving unit 391 and a DR control unit 392. The receiving unit 391 is the same as the receiving unit 191, and therefore a description thereof will be omitted.

[0167] The hot water addition operation is an operation in which hot water in the hot water storage tank 21 is supplied into the bathtub 150. The basic operation of the hot water addition operation is the same as the bath filling operation. The control unit 390 starts the hot water addition operation when it receives a signal to start the hot water addition operation by the user operating the remote controller 130. Furthermore, while the hot water addition operation is being performed, the control unit 390 may end the hot water addition operation when it receives a signal to end the hot water filling operation by the user operating the remote controller 130, or when the water level in the bathtub 150 detected by a water level sensor (not shown) provided in the bathtub 150 reaches a predetermined target value.

[0168] (1) DR control unit The DR control unit 392 controls so as not to perform the boiling operation during the first period. However, as will be described later, if the DR control unit 392 determines that the boiling operation should be performed, the boiling operation is performed.

[0169] When a hot water dispense instruction is received during the first period, the DR control unit 392 determines whether to comply with the hot water dispense instruction and controls the operation of the water heater 1. In this embodiment, the start signal for the hot water filling operation, the start signal for the hot water topping up operation, and the start signal for the reheating operation are referred to as hot water dispense instructions. The planned amount of hot water dispensed in connection with the hot water filling operation is stored in advance in a storage device. The planned amount of hot water dispensed in connection with the hot water topping up operation may be calculated based on the water level in the bathtub 150 detected by a water level sensor (not shown) provided in the bathtub 150, the output signals of the mixed water temperature sensor T7 and the second hot water supply temperature sensor T9, etc. The planned amount of hot water dispensed in connection with the reheating operation may be calculated based on the output signals of the second hot water supply temperature sensor T9 and the bathtub return temperature sensor T10, etc.

[0170] When receiving a hot water dispensing instruction, the DR control unit 392 determines whether or not to comply with the hot water dispensing instruction, depending on the planned amount of hot water dispensed based on the hot water dispensing instruction, as shown in the flowchart of FIG.

[0171] When receiving a hot water dispense command, the DR control unit 392 determines whether or not it is the first period (step S31). If it is not the first period (NO in step S31), the DR control unit 392 does not determine whether or not to comply with the hot water dispense command.

[0172] If it is the first period (YES in step S31), the DR control unit 392 calculates a planned amount of hot water dispensed based on the hot water dispense instruction (step S32).

[0173] If the planned amount of hot water dispensed based on the hot water dispense instruction is equal to or greater than the third amount of water (YES in step S33), the DR control unit 392 determines to comply with the hot water dispense instruction (step S34).

[0174] On the other hand, if the planned amount of hot water dispensed is less than the third amount of water (NO in step S33), the DR control unit 392 determines not to comply with the hot water dispense instruction (step S35).

[0175] For example, if the hot water dispensing command is a signal to start the water filling operation, the DR control unit 392 determines whether the planned amount of hot water to be dispensed in the water filling operation is equal to or greater than the third water volume. If the planned amount of hot water to be dispensed is equal to or greater than the third water volume, the DR control unit 392 determines that the hot water dispensing command is acceptable and starts the water filling operation.

[0176] Furthermore, for example, if the hot water dispensing command is a signal to start hot water addition operation, the DR control unit 392 determines whether the planned hot water dispensing amount associated with the hot water addition operation is equal to or greater than the third water amount. If the planned hot water dispensing amount is equal to or greater than the third water amount, the DR control unit 392 determines that the hot water dispensing command is complied with and starts the hot water addition operation.

[0177] Furthermore, for example, if the hot water dispensing command is a signal to start reheating operation, the DR control unit 392 determines whether the planned amount of hot water dispensed with the reheating operation is equal to or greater than the third water volume. If the planned amount of hot water dispensed is equal to or greater than the third water volume, the DR control unit 392 determines that the hot water dispensing command is accepted and starts reheating operation.

[0178] (2) Features (2-1) In hot water supply system 300 of the present embodiment, control unit 390 dispenses hot water in accordance with the hot water dispensing instruction when the planned amount of hot water dispensed based on the hot water dispensing instruction is equal to or greater than the third water amount.

[0179] A hot water dispense instruction that has a large planned amount of hot water dispensed is often given a high priority. This configuration improves user convenience.

[0180] (3) Variations (3-1) Variation 3A In this embodiment, DR control unit 392 determines whether to comply with a hot water dispense instruction based on the planned amount of hot water dispensed based on the hot water dispense instruction. However, DR control unit 392 may also determine whether to comply with a hot water dispense instruction based on the operation details of water heating apparatus 1 based on the hot water dispense instruction. Information correlating the operation details of water heating apparatus 1 with whether hot water can be dispensed during the first period may be stored in advance in a storage device as hot water dispense information. The hot water dispense information may be set by a user of water heating apparatus 1 operating remote controller 130.

[0181] By determining whether to dispense hot water depending on the operation of water heater 1, convenience for the user is improved.

[0182] <Fourth embodiment> A hot water supply system 400 according to a fourth embodiment will be described with reference to the drawings.

[0183] As shown in Fig. 7, a hot water supply system 400 according to the fourth embodiment includes two or more hot water supply devices 4. The basic configuration and operation of each hot water supply device 4 are the same as those of the hot water supply device 1 of the first embodiment. Below, the hot water supply system 400 according to the fourth embodiment will be described, focusing on the differences from the hot water supply system 100 according to the first embodiment.

[0184] Control unit 490 mainly performs the boiling operation, hot water supply operation, water filling operation, and reheating operation of each water heater 4. Control unit 490 also has, as functional blocks, a receiving unit 491 and a DR control unit 492. Receiving unit 491 is the same as receiving unit 191, and therefore a description thereof will be omitted.

[0185] (1) DR control unit When one water heating apparatus 4 performs the heating operation in the first period, DR control unit 492 restricts the operation of the other water heating apparatuses 4.

[0186] Specifically, the DR control unit 492 limits the number of water heating apparatuses 4 that perform the heating operation during the first period. The DR control unit 492 sets the reduction target value for power consumption to a value equal to or greater than the target value (reduction level value) for power consumption included in the downward DR request. The DR control unit 492 calculates the limit number of water heating apparatuses 4 based on the reduction target value. Information associating the reduction target value with the limit number may be stored in advance in a storage device as reference information. The DR control unit 492 may determine the limit number based on the reference information.

[0187] DR control unit 492 stores in the storage device the number of water heating devices 4 that performed the water heating operation during the first period. When the limited number of water heating devices 4a have already started the water heating operation and an instruction to perform the water heating operation of water heating device 4b is given, DR control unit 492 determines that the water heating operation of water heating device 4b will not be performed.

[0188] (2) Features (2-1) In hot water supply system 400 of the present embodiment, control unit 490 controls the operation of two or more hot water supply devices 4. When one hot water supply device 4 performs a boiling operation during a first period, control unit 490 restricts the operation of the other hot water supply devices 4.

[0189] With this configuration, it is possible to limit the power usage across all of the plurality of water heating devices 4. As a result, it is possible to respond to requests for lower DR.

[0190] (2-2) In the hot water supply system 400 of this embodiment, the control unit 490 sets the reduction target value of power consumption to a value equal to or greater than the reduction level value of power consumption, which is set based on a demand response request.

[0191] With this configuration, even when one or more water heating devices 4 are in boiling operation, it is possible to limit the power usage across all of the plurality of water heating devices 4. As a result, it is possible to respond to a request for lower DR.

[0192] (2-3) In hot water supply system 400 of the present embodiment, control unit 490 limits the number of hot water supply devices 4 that perform the heating operation in the first period.

[0193] With this configuration, it is possible to limit the power usage across all of the plurality of water heating devices 4. As a result, it is possible to respond to requests for lower DR.

[0194] (3) Variations (3-1) Variation 4A In this embodiment, DR control unit 492 limits the number of water heating devices 4 that perform water heating operation in the first period. However, when performing water heating operation with one water heating device 4, DR control unit 492 may determine that the other water heating devices 4 perform water heating operation at a heating capacity that is smaller than the standard heating capacity. Note that the standard heating capacity is the heating capacity in normal water heating operation, and refers to the heating capacity based on the rated power (the maximum power that can be used in continuous operation at a specified ambient temperature) using commercial power.

[0195] With this configuration, it is possible to limit the power usage across all of the plurality of water heating devices 4. As a result, it is possible to respond to requests for lower DR.

[0196] Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined in the claims. [Explanation of symbols]

[0197] 1. Hot water supply equipment 4. Hot water supply equipment 21 Hot water tanks, tanks 100 Hot Water System 190 Control Unit 200 Hot Water System 290 Control Unit 300 Hot Water System 390 Control Unit 400 Hot Water System 490 Control Unit [Prior art documents] [Patent documents]

[0198] [Patent Document 1] Japanese Patent Application Publication No. 2019-105984

Claims

1. A tank (21); a control unit (190, 290, 390, 490) that controls the operation of the hot water supply device (1, 4) that performs a boiling operation to heat the hot water in the tank; Equipped with The control unit A demand response request is received, When a hot water dispense instruction is received during a first period in which power consumption is reduced, which is set based on the demand response request, the hot water dispense instruction is determined to be complied with. Hot water system (100, 200, 300, 400).

2. The control unit determines whether to comply with the hot water supply instruction depending on the degree of urgency. The hot water system according to claim 1 .

3. the control unit determines the urgency level based on a user operation. The hot water supply system according to claim 2 .

4. The control unit determines whether to comply with the hot water dispense command depending on the amount of hot water remaining in the tank and the planned amount of hot water dispensed based on the hot water dispense command. The hot water supply system according to claim 1 or 2.

5. When the remaining amount of hot water is smaller than a second amount of water, which is the sum of the planned amount of hot water to be dispensed and a predetermined first amount of water, the control unit dispenses hot water in accordance with the hot water dispensing instruction. The hot water supply system according to claim 4.

6. The control unit performs the boiling operation and also dispenses hot water. The hot water supply system according to claim 5 .

7. The control unit heats the hot water during the boiling operation so that the remaining hot water amount is equal to or greater than the first water amount. The hot water supply system according to claim 6.

8. The control unit dispenses hot water at an amount equal to or less than the remaining amount of hot water. The hot water supply system according to claim 5 .

9. When the remaining amount of hot water is smaller than a second amount of water obtained by adding the planned amount of hot water to the first amount of hot water, the control unit does not dispense hot water based on the hot water dispensing instruction. The hot water supply system according to claim 4.

10. The control unit determines whether to comply with the hot water dispense instruction according to a first time period from the scheduled hot water dispense time according to the hot water dispense instruction to the end time of the first period. The hot water supply system according to claim 1 .

11. The control unit performs the boiling operation and dispenses hot water when the amount of hot water remaining in the tank is smaller than the planned amount of hot water dispensed based on the hot water dispense instruction and the first time is equal to or longer than a predetermined second time. The hot water system according to claim 10.

12. The control unit does not dispense hot water based on the hot water dispensing command when the amount of hot water remaining in the tank is smaller than the planned amount of hot water dispensed based on the hot water dispensing command and the first time is shorter than a predetermined second time. The hot water system according to claim 10.

13. The second time period is set by a user. The hot water supply system according to claim 11 or 12.

14. The control unit determines whether to comply with the hot water supply instruction depending on the operation content of the hot water supply device based on the hot water supply instruction. The hot water supply system according to claim 1 .

15. When the planned amount of hot water to be dispensed based on the hot water dispensing instruction is equal to or greater than a third amount of water, the control unit dispenses hot water in accordance with the hot water dispensing instruction.

15. The hot water supply system according to claim 1 or 14.

16. The control unit Controlling the operation of two or more of the hot water heaters; When the boiling operation is performed in one of the hot water supply devices during the first period, operation of the other hot water supply devices is restricted. The hot water supply system according to claim 1 .

17. the control unit sets the power consumption reduction target value to a value equal to or greater than the power consumption reduction level value set based on the demand response request.

17. The hot water system of claim 16.

18. The control unit limits the number of the water heating devices that perform the water heating operation during the first period.

18. The hot water supply system according to claim 16 or 17.

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