JP7501380B2 - Hot water supply equipment - Google Patents

Description

This disclosure relates to a water heater.

The following Patent Document 1 proposes a storage-type hot water supply device that allows low-temperature boiling by selecting a disaster mode via remote control and setting the target boiling temperature as desired when a disaster occurs.

JP 2009-162415 A

The technology in Patent Document 1 is based on the premise that the user will configure the settings using a remote control when a disaster occurs. Patent Document 1 does not anticipate the situation in which the user is unable to operate the remote control, or in which the priority of the operation of the storage type hot water heater is lowered.

The present disclosure is intended to solve the problems described above. The purpose of the present disclosure is to provide a water heater that can operate in a disaster-predicted manner even in the event of a power outage caused by a disaster and without any operation by the user.

The hot water supply device according to the present disclosure includes a control means for detecting the occurrence of a power outage and recovery from the power outage, and an operation means operable by a user. The hot water supply device according to the present disclosure is configured to be operable in a temporary power outage mode assuming a temporary power outage in which the operation state before the power outage is maintained, and in a disaster power outage mode assuming a power outage due to a disaster in which the operation state before the power outage is operated in a preset operation state different from the operation state before the power outage, in response to the operation of the operation means by a user . When the control means detects recovery from the power outage after detecting the occurrence of a power outage, it causes the operation means to execute a notification prompting the user to select either the temporary power outage mode or the disaster power outage mode. If the temporary power outage mode or the disaster power outage mode has not been selected after a certain time has elapsed since the operation means executed the notification, the operation is performed in the disaster power outage mode.

According to the present disclosure, it is possible to provide a water heater that can operate in a disaster-predicted manner even in the event of a power outage caused by a disaster and without any operation by the user.

1 is a diagram showing a storage type hot water heater according to embodiment 1. FIG. FIG. 2 is an operational flow diagram of the storage type hot water heater according to the first embodiment.

Below, an embodiment of the water heater according to the present disclosure will be described with reference to the drawings. Common or corresponding elements in each drawing will be given the same reference numerals, and the description will be simplified or omitted. In the following description, the terms "hot water", "water", or "hot water and water" generally mean liquid water, and can include water of low temperature to hot water. Note that the water heater according to the present disclosure is not limited to the one described in the following embodiment. The configurations disclosed in the following embodiment can be modified and combined in various ways without departing from the spirit of the present disclosure.

Embodiment 1.
FIG. 1 is a diagram showing a storage type water heater 35 according to the first embodiment. The storage type water heater 35 may be a household type used in a house, or may be a commercial type used in a store, an office, a facility, or the like. In the present embodiment, the storage type water heater 35 is described as an example, but the water heater according to the present disclosure is not limited to the storage type water heater 35. The water heater according to the present disclosure may be, for example, a type other than the storage type.

As shown in FIG. 1, the storage type hot water heater 35 according to the first embodiment includes an HP unit 7 that utilizes a heat pump cycle, and a tank unit 33 having a hot water storage tank 8. The HP unit 7 functions as a heating means for heating low-temperature water guided from the hot water storage tank 8 of the tank unit 33. Note that the hot water heater according to the present disclosure is not limited to one that uses the HP unit 7 as a heating means. For example, the hot water heater according to the present disclosure may use an electric heater or the like provided inside the tank unit 33 as a heating means.

The HP unit 7 and the tank unit 33 are connected via the HP forward pipe 14, the HP return pipe 15, and electrical wiring (not shown). In the illustrated configuration example, the tank unit 33 has a built-in control unit 36. The operation of various actuators such as valves and pumps provided in the tank unit 33 and the HP unit 7 is controlled by the control unit 36, which is electrically connected to them.

The control unit 36 corresponds to the control means in this disclosure. The control unit 36 includes at least one processor and at least one memory. The control unit 36 also has a timer function that manages the date and time. Note that the configuration of the control means in this disclosure is not limited to the control unit 36. For example, the function of the control means in this disclosure may be realized by the cooperation of multiple devices installed in different locations.

The HP unit 7 has a compressor 2, a water-refrigerant heat exchanger 3, an expansion valve 4, and an air heat exchanger 6. The compressor 2, the water-refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 6 are connected in a ring shape by refrigerant piping 5 to form a heat pump cycle. The water-refrigerant heat exchanger 3 exchanges heat between the refrigerant compressed by the compressor 2 and flowing through the refrigerant piping 5 and low-temperature water guided from the tank unit 33.

The tank unit 33 contains the following various components and piping. As described above, the tank unit 33 contains the hot water storage tank 8. The hot water storage tank 8 is for storing hot water. Inside the hot water storage tank 8, temperature stratification is formed, with the upper side being hotter and the lower side being colder, due to differences in water density caused by temperature.

One end of a third water supply pipe 9c is connected to a water inlet 8a provided at the bottom of the hot water tank 8. Water supplied from a water source such as a water supply is adjusted to a predetermined pressure by a pressure reducing valve 31 and flows into the hot water tank 8 through the third water supply pipe 9c.

A hot water supply pipe 21 and a hot water delivery pipe 13 are connected to the hot water inlet outlet 8d provided at the top of the hot water storage tank 8. The hot water supply pipe 21 is a pipe for supplying hot water stored in the hot water storage tank 8 to the outside of the hot water storage type water heater 35. The hot water delivery pipe 13 is a pipe for supplying high-temperature hot water to the top of the hot water storage type water heater 35.

High-temperature water heated by the HP unit 7 flows in through the hot water inlet outlet 8d, and the high-temperature water gradually accumulates from top to bottom in the hot water storage tank 8. In addition, low-temperature water from the third water supply pipe 9c flows into the lower part of the hot water storage tank 8 through the water inlet 8a. This causes hot water to be stored in the hot water storage tank 8 so that a temperature difference occurs between the top and bottom.

A number of hot water temperature sensors 42, 43 are attached at different heights on the surface of the hot water tank 8. The temperature distribution of the hot water in the hot water tank 8 can be detected by the multiple hot water temperature sensors 42, 43, and the amount of hot water and heat stored in the hot water tank 8 can be detected. The control unit 36 controls the start and stop of the heating operation by the HP unit 7 according to the detected amount of hot water or heat stored in the hot water tank 8. The heating operation in the hot water storage type water heater 35 is an operation in which the hot water in the hot water tank 8 is heated by the HP unit 7, which is an example of a heating means, so that the amount of hot water stored in the hot water tank 8 becomes a preset amount of hot water. In the illustrated example, two hot water temperature sensors 42, 43 are provided, but three or more hot water temperature sensors may be provided.

The tank unit 33 includes a circulation pump 12 and a bath heat exchanger 20. The circulation pump 12 is a pump for circulating hot water through various pipes in the tank unit 33. The bath heat exchanger 20 uses high-temperature hot water supplied from the hot water storage tank 8 and the HP unit 7 to heat the water to be heated that flows through the secondary flow path of the bath heat exchanger 20. The water to be heated by the bath heat exchanger 20 is, for example, bath water, which is hot water in a bathtub 30 installed in the bathroom 80, and hot water for heating. The bath heat exchanger 20 is a heat exchange means for exchanging heat between the hot water in the hot water storage tank 8 and the bath water in the bathtub 30.

The circulation pump 12 is provided on the HP supply pipe 14. The secondary flow path of the bath heat exchanger 20 is connected to the bathtub 30 via the bath supply pipe 27 and the bath return pipe 28. The bath heat exchanger 20, the bathtub 30, the bath return pipe 28, and the bath supply pipe 27 constitute a bath circulation circuit, which is a circuit through which bathtub water circulates.

In the bath circulation circuit, a bath circulation pump 29, a bath return temperature sensor 38, a bath supply temperature sensor 37, a water flow sensor 46, and a water level sensor 47 are installed. The bath circulation pump 29 is a pump that circulates bath water, and in the illustrated configuration example, it is installed in the bath return pipe 28. The bath return temperature sensor 38 is a sensor that detects the temperature of the bath water coming out of the bath 30, and is installed in the bath return pipe 28. The bath supply temperature sensor 37 is a sensor that detects the temperature of the hot water after heat exchange that comes out of the bath heat exchanger 20, and is installed in the bath supply pipe 27. The water flow sensor 46 is an example of a water flow detection means that detects the circulation of hot water and water in the bath circulation circuit, and in the illustrated configuration example, it is installed in the bath supply pipe 27. The water level sensor 47 is a sensor that detects the water level in the bath 30, and in the illustrated configuration example, it is installed in the bath supply pipe 27.

The tank unit 33 also has a built-in three-way valve 11 and a four-way valve 18. The three-way valve 11 is a flow path switching means having ports a and b through which hot and cold water flows in, and port c through which hot and cold water flows out. The four-way valve 18 is a flow path switching means having ports b and c through which hot and cold water flows in, and ports a and d through which hot and cold water flows out. The four-way valve 18 is configured to be able to switch between four paths: a-b, a-c, b-d, and c-d.

The a port of the three-way valve 11 is connected to the water outlet 8b at the bottom of the hot water storage tank 8 by the water outlet pipe 10. The b port of the three-way valve 11 is connected to the outlet of the primary flow path of the bath heat exchanger 20 by the hot water outlet pipe 20b. The c port of the three-way valve 11 is connected to the inlet side of the HP unit 7 by the HP forward pipe 14.

The a port of the four-way valve 18 is connected by a first bypass pipe 16 to a hot water inlet 8c provided between the middle and lower parts of the hot water tank 8 in the vertical direction. The b port of the four-way valve 18 is connected to a second bypass pipe 17 that branches off from the HP forward pipe 14 between the circulation pump 12 and the inlet side of the HP unit 7. The c port of the four-way valve 18 is connected by an HP return pipe 15 to the outlet side of the HP unit 7. The d port of the four-way valve 18 is connected by a hot water supply pipe 13 to the hot water inlet/outlet 8d.

In the illustrated configuration example, the tank unit 33 has a built-in heat recovery switching valve 19. The heat recovery switching valve 19 is a flow path switching means having a port a through which hot water flows out, and ports b and c through which hot water flows in. The port a of the heat recovery switching valve 19 is connected to the inlet of the primary flow path of the bath heat exchanger 20 by a hot water inlet pipe 20a. The port b of the heat recovery switching valve 19 is connected to a reheating connection pipe 20c that branches off from the hot water supply pipe 13. The port c of the heat recovery switching valve 19 is connected to a heat recovery outlet 8e provided between the middle and lower parts of the hot water storage tank 8 in the height direction by a heat recovery connection pipe 20d.

The other end of the third water supply pipe 9c is connected to one end of the first water supply pipe 9a and one end of the second water supply pipe 9b via a pressure reducing valve 31. The other end of the first water supply pipe 9a is connected to a water source such as a water supply system. The first water supply pipe 9a, the second water supply pipe 9b, and the third water supply pipe 9c constitute a water supply line for supplying water from the water source to the storage type hot water heater 35.

The tank unit 33 further includes a hot water supply mixing valve 22 and a bath mixing valve 23. The other end of the second water supply pipe 9b branches off and is connected to the hot water supply mixing valve 22 and the bath mixing valve 23. The hot water supply pipe 21 described above branches off and is connected to the hot water supply mixing valve 22 and the bath mixing valve 23. The hot water supply mixing valve 22 and the bath mixing valve 23 adjust the flow rate ratio between the high-temperature hot water supplied from the hot water supply pipe 21 and the low-temperature water supplied from the second water supply pipe 9b to generate hot water at a temperature set by the user.

The hot water mixing valve 22 allows the hot water it produces to flow into the first hot water supply pipe 24. The hot water that has been adjusted in temperature by the hot water mixing valve 22 is supplied to a shower 82 or a faucet such as a faucet via the first hot water supply pipe 24, the hot water tap 34, and the external hot water supply pipe 81. The hot water supply flow rate, which is the amount of hot water supplied from the hot water mixing valve 22, can be detected by a general hot water supply flow rate sensor 32 provided on the first hot water supply pipe 24.

The bath mixing valve 23 allows the generated hot water to flow into the second hot water supply pipe 25. A bath solenoid valve 26 that opens and closes the second hot water supply pipe 25 and a bath flow sensor 45 that detects the flow rate of hot water passing through the second hot water supply pipe 25 are provided in the middle of the second hot water supply pipe 25. The hot water whose temperature has been adjusted by the bath mixing valve 23 is supplied to the bathtub 30 via the second hot water supply pipe 25, the bath solenoid valve 26, the bath supply pipe 27 and the bath return pipe 28.

The hot water storage type water heater 35 of this embodiment also includes emergency water intake valves 50, 51. In the event of a water outage due to a disaster or the like, the user can open the emergency water intake valves 50, 51 to take out and use the hot water in the hot water storage tank 8.

The control unit 36, which is the control means in this embodiment, is configured to be able to detect the occurrence of a power outage and recovery from a power outage. When a power outage occurs, the power outage timer, which is a function of the control unit 36, can count the power outage time. In this embodiment, the control unit 36 determines that a power outage has occurred and detects a power outage when the time counted by the power outage timer has exceeded a certain period of time. The control unit 36 also detects recovery from a power outage when power supply is resumed after the detection of the power outage.

The storage type hot water heater 35 of this embodiment is equipped with a kitchen remote control 48 and a bathroom remote control 49. The control unit 36, the kitchen remote control 48, and the bathroom remote control 49 are connected so that they can communicate with each other. The kitchen remote control 48 and the bathroom remote control 49 are examples of operating means that can be operated by the user. Only one of the kitchen remote control 48 and the bathroom remote control 49 may be installed, or an additional operating means such as a separate remote control may be provided.

Although not shown, each remote control is equipped with a display unit that displays information such as the status of the storage type water heater 35, an operation unit such as a switch operated by the user, a speaker, a microphone, etc. The display unit and speaker of the remote control function as a notification means for notifying information. The display unit may be a touch screen or the like that also functions as an operation unit. The kitchen remote control 48 and bathroom remote control 49, which are examples of operation means, are configured to be able to execute various notifications.

The hot water storage type water heater 35 of this embodiment is characterized by being capable of operating in a "temporary power outage mode" that assumes a temporary power outage such as when a breaker in the home temporarily trips, and in a "disaster power outage mode" that assumes a long-lasting large-scale power outage due to a natural disaster or the like. The temporary power outage mode is an operation mode in which, when a temporary power outage occurs, the operation is performed so as to maintain the operating state before the power outage. The disaster power outage mode is an operation mode in which, when a power outage occurs due to a disaster, the operation is performed in a preset operating state that is different from the operating state before the power outage.

In disaster power outage mode, the hot water storage type water heater 35 may operate in any of a variety of ways suitable for operation after recovery from a power outage caused by a disaster. As one example, in disaster power outage mode, the hot water storage type water heater 35 performs a low-temperature hot water storage operation that lowers the temperature of hot water in the hot water storage tank 8. As one example, the temperature of the hot water in the hot water storage tank 8 during operation in disaster power outage mode drops to below the temperature of the hot water in the hot water storage tank 8 during operation in temporary power outage mode. This makes it possible to prevent users from getting burned when taking hot water directly from the emergency water intake valves 50, 51 in the hot water storage tank 8.

An example of an operation for lowering the temperature of the hot water in the hot water storage tank 8 is a stirring operation in which the hot water in the hot water storage tank 8 is stirred. The stirring operation can be performed by generating a water flow in the hot water storage tank 8 using various pumps. Another example of an operation for lowering the temperature of the hot water in the hot water storage tank 8 is a heat exchange operation in which heat is exchanged between the hot water in the hot water storage tank 8 and the bathtub water using the bath heat exchanger 20, which is a heat exchange means. Other examples of an operation for lowering the temperature of the hot water in the hot water storage tank 8 include various operations such as an operation for supplying high-temperature water in the hot water storage tank 8 to the outside while supplying low-temperature water from a water source into the hot water storage tank 8.

After recovery from a power outage, the user determines whether the power outage was temporary or due to a disaster. When the control unit 36 detects recovery from a power outage after detecting the occurrence of a power outage, it causes the kitchen remote control 48, which is an example of an operating means, to issue a notification prompting the user to select either temporary power outage mode or disaster power outage mode. If the user determines that the power outage is temporary, the user selects the temporary power outage mode using the kitchen remote control 48, which is an example of an operating means. If the user determines that the power outage is due to a disaster, the user selects the disaster power outage mode using the kitchen remote control 48, which is an example of an operating means. After recovery from the power outage, the hot water storage type water heater 35 operates in the operating mode selected by the user.

Furthermore, if the temporary power outage mode or disaster power outage mode has not been selected after a certain time has elapsed since the kitchen remote control 48 issued the above-mentioned notification, the hot water storage type hot water heater 35 operates in the disaster power outage mode.
Even if a power outage occurs due to a disaster and the user is unable to operate the kitchen remote control 48 for a certain period of time, operation can be automatically performed assuming a disaster.

The first time, which is the count time of the power outage timer for determining whether a power outage has occurred, may be set by, for example, the kitchen remote control 48. For example, it may be determined that a power outage has occurred one second after power supply to the hot water storage type water heater 35 is no longer supplied with power, or it may be determined that a power outage has occurred 10 seconds later. That is, the control unit 36 may be configured to detect the occurrence of a power outage when the time elapsed from the occurrence of a power outage to the recovery is equal to or longer than the first time set in advance. In this example, the control unit 36 does not determine that a power outage has occurred if the time elapsed from the occurrence of a power outage to the recovery does not reach the first time set in advance. If it is not determined that a power outage has occurred, the hot water storage type water heater 35 continues to operate in the operating state before the power outage. For example, in a home where the breaker frequently trips, the first time may be set to a longer time, thereby eliminating the need to select the temporary power outage mode every time a power outage occurs.

The control unit 36 may be configured not to determine whether a power outage has occurred until a certain period of time has elapsed since the supply of electricity to the storage type hot water heater 35 and the start of the operation of the storage type hot water heater 35. For example, the operation may be an operation until the completion of a boiling operation, which is an operation in which the amount of hot water stored in the hot water tank 8 is set to a preset amount of hot water. The certain period of time is, for example, one week. In other words, the storage type hot water heater 35 may be configured to start the operation of detecting a power outage by the control unit 36 after a certain period of time has elapsed since the storage type hot water heater 35 is supplied with electricity and starts its operation. For example, during the period from when the storage type hot water heater 35 is delivered to the user after installation work until the user becomes accustomed to using it in normal life, it is assumed that the user will suddenly turn off the power or inspect it due to inexperience. In this example, in the above case, the effect of preventing the user from being unnecessarily prompted to determine whether a disaster has occurred can be obtained. In addition, it is possible to prevent erroneous detection of a power outage during power operation during a test run immediately after the installation of the storage type hot water heater 35. It also prevents erroneous detection of a power outage immediately after replacing a control board during a malfunction or inspection.

A second time different from the first time described above may be set by the kitchen remote control 48 as the count time of the power outage timer. The second time is, for example, one month. The control unit 36 may be configured not to detect the occurrence of a power outage if the time elapsed from the occurrence of the power outage to the restoration exceeds the preset second time. For example, it is assumed that the power will be turned off during the period from the installation and repair work of the hot water storage type water heater 35 to the delivery to the user. It is also assumed that the power will be turned off when the user is away for an extended period of time, such as when traveling abroad. In this example, it is possible to prevent the user from being unnecessarily prompted to determine whether or not a disaster has occurred when the power is restored after such a long period of non-use.

As shown in the example, an external power communication device 44 may further be provided. The external power communication device 44 links the hot water storage type water heater 35 with the battery storage system and wireless devices, and can exchange communication information related to power supply and device operation instructions. The external power communication device 44 is equipped with a display unit and an operation unit, just like each remote control. Furthermore, the external power communication device 44 can cause the battery storage system to supply power when the power source that is normally used is no longer supplied, such as during a power outage. For example, even during a long-term power outage such as a natural disaster, if power can be supplied from the battery storage system, power can be immediately supplied to the hot water storage type water heater 35.

The external power communication device 44 may also have various functions that the kitchen remote control 48, which is an operating means, has. In other words, the external power communication device 44 may constitute an example of an operating means according to the present disclosure. Similarly, the bathroom remote control 49 may also have various functions that the kitchen remote control 48 has.

As described above, after the hot water storage type water heater 35 recovers from a power outage and prompts the user to select either the temporary power outage mode or the disaster power outage mode using the kitchen remote control 48, the hot water storage type water heater 35 switches to the disaster power outage mode and operates after a certain time has passed. Here, before switching to the disaster power outage mode, the control unit 36 may inquire of an external communication terminal held by the user, such as a smartphone or tablet, whether or not the user can switch to the disaster power outage mode. If the external communication terminal selects that switching to the disaster power outage mode is not possible, the hot water storage type water heater 35 may operate in the temporary power outage mode without switching to the disaster power outage mode. According to this example, for example, when the user is not present in the house in which the hot water storage type water heater 35 is installed and does not notice the power outage, it is possible to prevent the user from switching to the disaster power outage mode unnecessarily due to the passage of time alone.

Figure 2 is an operational flow diagram of the hot water storage type hot water heater 35 according to embodiment 1. With reference to Figure 2, an example of the operational flow of the hot water storage type hot water heater 35 when a power outage occurs will be described.

In the flow diagram of FIG. 2, the initial state is a state in which a power outage occurs while the hot water storage type hot water heater 35 can be used as usual (step S1). After the power outage occurs, the system eventually returns to a state in which the power has been restored (step S2). The state of step S2 can be either when a temporarily tripped breaker is turned back on or when an emergency power source such as a battery storage system is switched on.

When the power is restored from the power outage in step S2, the kitchen remote control 48 displays a screen that allows the user to select either the temporary power outage mode or the disaster power outage mode, and the system goes into a standby state until a certain period of time has passed (step S3). If the user selects either the temporary power outage mode or the disaster power outage mode during this standby state, the system proceeds to the next step (step S3-1). If the temporary power outage mode is selected, the hot water storage type water heater 35 transitions to the temporary power outage mode (step S4-1). After transitioning to the temporary power outage mode, the hot water storage type water heater 35 performs normal operation, which is the operation that was performed before the power outage (step S5-1).

If disaster power outage mode is selected in step S3-1, the hot water storage type water heater 35 transitions to disaster power outage mode (step S4-2). After transitioning to disaster power outage mode, the hot water storage type water heater 35 performs, for example, low-temperature hot water storage operation as operation in disaster power outage mode (step S5-2).

If a certain period of time, for example 30 minutes, has elapsed without an operation mode being selected in step S3 (step S3-2), the hot water storage type water heater 35 automatically switches to disaster power outage mode (step S4-2).

As described above, the low-temperature hot water storage operation is an operation that lowers the temperature of the hot water in the hot water storage tank 8. In the low-temperature hot water storage operation, for example, the temperature of the hot water in the hot water storage tank 8 is set to a temperature lower than the target temperature (e.g., 80°C) of the hot water in the hot water storage tank 8 in the normal boiling operation. In the low-temperature hot water storage operation, the temperature of the hot water in the hot water storage tank 8 can be set to a temperature that does not cause burns, such as 40°C. This can prevent the user from being burned when taking out the hot water in the hot water storage tank 8 directly from the emergency water taps 50 and 51. The temperature of the hot water in the boiling operation in the low-temperature hot water storage operation may be set to, for example, the lowest temperature among the target temperatures in the normal boiling operation. This can achieve both the avoidance of the risk of the user being burned and the improvement of convenience by ensuring hot water at a temperature close to that used in normal conditions.

As an example of the operation of the equipment during low-temperature hot water storage operation, the hot water storage tank 8 and the remaining water in the piping may be circulated by the circulation pump 12 to perform the stirring operation described above, or the bath heat exchanger 20 may perform heat exchange between the hot water in the hot water storage tank 8 and the bathtub water. The low-temperature hot water storage operation is stopped when the hot water storage temperature sensors 42, 43 detect any temperature.

After completing the low-temperature hot water storage operation, the hot water storage type water heater 35 cancels the disaster power outage mode and switches to the normal operation mode. If the hot water in the hot water storage tank 8 is used up after operating in the disaster power outage mode to lower the water temperature, and the system has recovered from the disaster without a water outage, the system will automatically switch back to the normal operation mode, ensuring the necessary amount of hot water. In this example, it is possible to reduce the user's effort to operate the kitchen remote control 48 or other operating means to switch back to the normal operation mode after recognizing that the system has recovered from the disaster.

As described above, the hot water storage type water heater 35 of this embodiment is configured so that when a power outage occurs and is restored, a temporary power outage mode or a disaster power outage mode can be selected on the screen of the remote control. If the remote control is not operated for a predetermined period of time and an operation mode is not selected, operation in disaster power outage mode is automatically performed. With the hot water storage type water heater 35 of this embodiment, when a power outage occurs due to a disaster, operation assuming a disaster can be performed even if no operation is performed by the user.

2 Compressor, 3 Water-refrigerant heat exchanger, 4 Expansion valve, 5 Refrigerant piping, 6 Air heat exchanger, 7 HP unit, 8 Hot water storage tank, 8a Water inlet, 8b Water outlet, 8c Hot water inlet, 8d Hot water inlet outlet, 8e Heat recovery outlet, 9a First water supply piping, 9b Second water supply piping, 9c Third water supply piping, 10 Water outlet piping, 11 Three-way valve, 12 Circulation pump, 13 Hot water supply piping, 14 HP forward piping, 15 HP return piping, 16 First bypass piping, 17 Second bypass piping, 18 Four-way valve, 19 Heat recovery switching valve, 20 Bath heat exchanger, 20a Hot water inlet piping, 20b Hot water outlet piping, 20c Reheating connection piping, 20d Heat recovery connection piping, 21 Hot water supply pipe, 22 Hot water supply mixing valve, 23 Bath mixing valve, 24 First hot water supply pipe, 25 Second hot water supply pipe, 26 Bath solenoid valve, 27 Bath supply pipe, 28 Bath return pipe, 29 Bath circulation pump, 30 Bathtub, 31 Pressure reducing valve, 32 General hot water supply flow sensor, 33 Tank unit, 34 Hot water supply tap, 35 Storage type hot water heater, 36 Control unit, 37 Bath supply temperature sensor, 38 Bath return temperature sensor, 42, 43 Storage hot water temperature sensor, 45 Bath flow sensor, 44 External power supply communication device, 46 Water flow sensor, 47 Water level sensor, 48 Kitchen remote control, 49 Bathroom remote control, 50, 51 Emergency water intake valve, 80 Bathroom, 81 Hot water supply external pipe, 82 Shower

Claims (12)

A control means for detecting the occurrence of a power outage and recovery from the power outage;
An operating means operable by a user;
Equipped with
The device is configured to be able to execute a temporary power outage mode operation, which assumes a temporary power outage in which the device operates to maintain the operating state before the power outage , and a disaster power outage mode operation , which assumes a power outage due to a disaster , in which the device operates in a preset operating state different from the operating state before the power outage, in response to the operation of the operating means by the user ;
When the control means detects a recovery from a power outage after detecting an occurrence of a power outage, the control means executes a notification to prompt the operation means to select either the temporary power outage mode or the disaster power outage mode,
A hot water supply device characterized in that if the temporary power outage mode or the disaster power outage mode has not been selected after a certain time has elapsed since the notification was made by the operating means, the hot water supply device operates in the disaster power outage mode. The control means inquires of an external communication terminal as to whether or not to switch to the disaster power outage mode before switching to the disaster power outage mode after the certain time has elapsed,
2. The hot water supply apparatus according to claim 1, wherein, when the external communication terminal selects not to switch to the disaster power outage mode, the hot water supply apparatus operates in the temporary power outage mode. Further comprising a hot water storage tank for storing hot water,
The hot water supply device according to claim 1 or 2, characterized in that in the disaster power outage mode, the hot water temperature in the hot water storage tank is lowered to a temperature lower than the hot water temperature in the hot water storage tank during operation in the temporary power outage mode. The hot water supply device according to claim 3, characterized in that an operation for lowering the hot water temperature in the hot water storage tank is performed by stirring the hot water in the hot water storage tank. The hot water storage tank further includes a heat exchange means for exchanging heat between the hot water in the hot water storage tank and the bath water in the bathtub.
4. The hot water supply apparatus according to claim 3, wherein the operation for lowering the temperature of the hot water in the hot water storage tank is performed by exchanging heat between the hot water in the hot water storage tank and the bathtub water. The hot water supply system further includes a heating means for heating the hot water in the hot water storage tank to a target temperature.
The hot water supply device according to claim 3, characterized in that the operation for lowering the hot water temperature in the hot water storage tank is performed by operating the heating means so that the target temperature in the disaster power outage mode is lower than the target temperature in the temporary power outage mode. The hot water supply device according to claim 6, characterized in that the target temperature in the disaster power outage mode is set to the lowest temperature in the temporary power outage mode. The hot water supply device according to any one of claims 1 to 7, characterized in that the control means is configured to detect the occurrence of a power outage when the time from the occurrence of the power outage to the recovery is equal to or longer than a preset first time. The hot water supply device according to any one of claims 1 to 8, characterized in that the control means is configured not to detect the occurrence of a power outage if the time from the occurrence of the power outage to the recovery exceeds a preset second time. The hot water supply device according to any one of claims 1 to 9, characterized in that the control means is configured to start detecting a power outage after a certain period of time has elapsed since the device is energized and starts operating. A hot water storage tank for storing hot water;
A heating means for heating the hot water in the hot water storage tank;
Further comprising:
The control means is configured to start a power outage detection operation after a certain period of time has elapsed since the power is turned on and the operation is started,
The hot water supply device according to claim 1 or 2, characterized in that the operating operation is an operation until the completion of a boiling operation in which heating is performed by the heating means so that the amount of hot water stored in the hot water storage tank reaches a preset amount. The hot water supply device according to any one of claims 3 to 7, characterized in that when the operation for lowering the temperature of the hot water in the hot water storage tank is completed, the disaster power outage mode is cancelled and the normal operation mode is entered.

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