JP5964099B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system.

A hot water supply system using a hot water storage type water heater represented by an electric heat pump stores hot water produced by being heated by a heat source device in a hot water storage tank, and mixes hot water taken out from the hot water storage tank with water using a mixing valve. The temperature is controlled to the hot water supply set temperature and supplied to the user through the hot water supply pipe.
In such a hot water supply system, hot water having the highest temperature that can be discharged is generally stored in a hot water storage tank, and a hot water heater can supply hot water having a high temperature exceeding 90 ° C. depending on the refrigerant.
Such hot water supply systems are used for showers, hot water from Karan, hot water heating, hot water sterilization, washing, etc. even in relatively large facilities such as hospitals, nursing homes, childcare facilities, factories, etc. The facility is operated under the control of an administrator.

Here, the hot water supply system of patent document 1 and patent document 2 is proposed as what took the countermeasure at the time of a disaster. In patent document 1, when the occurrence of a disaster is detected, boiling is performed at a low temperature in preparation for a subsequent water outage or power outage so that hot water at a temperature that is easy to use can be taken out from the hot water storage tank.
On the other hand, Patent Document 2 provides a disaster mode so that the boiling abnormality detection function based on the temperature detected by the temperature sensor in the hot water storage tank does not work when the water is shut off due to a disaster or a power failure occurs. In the disaster mode, the boiling abnormality detection function is disabled.

JP 2007-255753 A JP 2009-162415 A

Not only at the time of a disaster, an abnormality may occur in the hot water supply system. In Patent Documents 1 and 2, it is assumed that the heat source machine operates in order to perform boiling, but it is also assumed that the heat source machine does not operate due to failure or breakage of components or instruments used in the heat source machine.
Here, in the event of an abnormality in the hot water supply system, a service person for inspection and repair is dispatched promptly. However, if it takes a long time for the service person to arrive due to the remote area or busy season, the hot water in the hot water storage tank will be depleted if the heat source machine does not work and hot water is not made, so the hot water will not be consumed at all. Increased inconvenience for users in unusable situations.
The present invention has been made based on such a problem, and an object thereof is to provide a hot water supply system capable of avoiding or alleviating inconvenience that hot water cannot be used when an abnormality occurs in a heat source machine.

A hot water supply system of the present invention is a hot water supply system including a heat source device, a hot water storage tank that stores hot water produced by being heated by the heat source device, and a hot water supply path that guides the hot water in the hot water storage tank to a supply destination. , A hot water supply temperature lowering width setting means for setting a lowering width of the hot water supply setting temperature to the supply destination in an emergency mode executed in an emergency when an abnormality occurs in the hot water supply system, and water for introducing water into the hot water storage tank according to the lowering width At least one of water introduction means and water mixing means for mixing water according to the width of the hot water in the hot water supply path, and the water introduction means and the water mixing means are selected based on the hot water supply set temperature to the supply destination It is characterized by being provided .

According to the present invention, when the operation of the heat source machine is stopped due to the occurrence of an abnormality, water is added to the hot water storage tank by the water introduction means according to the amount of decrease from the hot water supply set temperature, or the hot water supply path by the water mixing means. By executing the emergency mode in which water is mixed with the hot water in accordance with the width of the hot water, the time during which hot water in the hot water storage tank can be supplied to the supply destination can be extended. Therefore, the inconvenience that hot water cannot be used can be avoided or alleviated.
Even if the administrator of the hot water supply system does not know the preset hot water supply temperature of the supply destination, it is possible to distribute hot water to the supply destination at a low temperature simply by setting a decrease width from the hot water supply preset temperature.

Here, hot water supply system of the present invention, Ru comprises selectively water introducing means and a water mixing means on the basis of the hot water set temperature to supply destination. When the lower limit of the hot water temperature in the hot water storage tank is determined for hygiene purposes, if the set hot water temperature is lower than the lower limit temperature, there is no allowance for lowering the hot water temperature in the hot water storage tank. What is necessary is just to select a mixing means.

  In the hot water supply system of the present invention, the scale indicating the estimated time or estimated time for hot water supply based on the capacity of the hot water storage tank, the amount and temperature of the hot water in the hot water storage tank, and the hot water set temperature and the temperature drop to the supply destination It is preferable to include estimated time confirmation means for confirming the above.

According to the present invention, by checking the estimated time or its scale, it is possible to determine the necessity of water introduction into the hot water storage tank or water mixing into the hot water in the hot water supply path according to the situation. Can be executed.
Also, if the estimated time or its scale is checked and the rate of decrease can be changed, the remaining time in the hot water tank can be maintained while balancing the estimated time for hot water supply and the decrease in hot water temperature. Effective use of hot water can be achieved.

  In the hot water supply system of the present invention, a plurality of supply destinations are classified into a first priority and a second priority having a lower priority than the first priority, and a first path that leads from the hot water storage tank to the first priority supply destination It is preferable to include a second path that connects the hot water storage tank to the second priority supply destination, and a switching valve that disconnects the second path from the hot water storage tank in an emergency.

In an emergency, when the second path is disconnected from the hot water storage tank by operating the switching valve, the hot water in the hot water storage tank is supplied only to the first priority supply destination having a high priority through the first path.
According to the present invention, user satisfaction can be enhanced by providing means for concentrating hot water in a hot water storage tank at a supply destination that requires hot water supply even in an emergency.

  According to the hot water supply system of the present invention, even if an abnormality occurs in the heat source unit, hot water in the hot water storage tank is quickly depleted by supplying hot water in the hot water storage tank to the supply destination at a temperature lower by a predetermined temperature. The inconvenience that no hot water can be used can be avoided.

It is a figure which shows the structure of the hot water supply system in 1st Embodiment. It is a figure which shows the internal structure of a control apparatus. It is a flowchart which shows a process when operation | movement of a heat-source machine stops by abnormality generation. It is a figure for demonstrating that embodiment of this invention is classified according to hot water supply preset temperature and tapping temperature. It is a figure which shows the structure of the hot water supply system of this invention classified based on FIG. It is a schematic block diagram of the hot water supply system in 2nd Embodiment.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
[First Embodiment]
A heat pump hot water supply system 1 shown in FIG. 1 includes a heat source device 2, a hot water storage tank 3 for storing hot water heated by the heat source device 2, a hot water supply path 4 for guiding the hot water in the hot water storage tank 3 to a supply destination, And a control device 5 for controlling the operation.
The administrator of the heat pump hot water supply system 1 uses a remote controller (hereinafter referred to as a remote controller) 6 that communicates with the control device 5 or a control terminal (not shown) provided in the heat source unit 2 to check the operation status of the system and various setting statuses. And give instructions for operation.

  The heat source device 2 has a refrigerant circulation path R1 through which a refrigerant (for example, carbon dioxide) circulates and a water circulation path R2 through which water circulates, and forms a refrigeration cycle of compression, condensation, expansion, and evaporation. A first heat exchanger 21, a compressor 22, a second heat exchanger 23, and an expansion valve 24 are provided on the refrigerant circuit R1. A second heat exchanger 23, a water circulation pump 25, and a hot water storage tank 3 are provided on the water circulation path R2.

  When the heat source unit 2 is operated, the refrigerant having a high temperature and high pressure by the compressor 22 passes through the second heat exchanger 23 via the refrigerant circulation path R1, and further passes through the expansion valve 24 and the first heat exchanger 21. While flowing into the compressor 22, water discharged from the water circulation pump 25 flows into the hot water storage tank 3 through the second heat exchanger 23. The heat source device 2 uses a refrigerant that is heated to a high temperature in the condensation process of the refrigeration cycle as a heat source, and hot water produced by heat exchange between the high-temperature refrigerant and water in the second heat exchanger 23 is stored in the hot water storage tank 3. It is done.

The hot water storage tank 3 has a capacity corresponding to the amount of hot water supply, and one or more hot water storage tanks 3 are provided. In the hot water storage tank 3, a plurality of temperature sensors 31 used for measuring the water level and the hot water temperature are provided at a plurality of positions having different heights. The hot water in the hot water storage tank 3 is maintained at a predetermined temperature or higher. Hereinafter, this predetermined temperature is referred to as a tank lower limit temperature _Tmin . The tank lower limit temperature T _min is set to 65 ° C. from the viewpoint of temperature hygiene, for example.
The hot water storage tank 3 is connected to water introduction means 32 for introducing water into the hot water storage tank 3.
The hot water supply path 4 is composed of a pipe connecting the hot water storage tank 3 and each supply destination.

The control device 5 shown in FIG. 2 is characterized by the functions used for the emergency of the hot water supply system 1.
Here, emergency means when an abnormality has occurred in the hot water supply system 1. The abnormality of the hot water supply system 1 is caused by, for example, damage to parts, disconnection or short circuit of a sensor or a valve. If an abnormality occurs in the heat source machine 2 and the operation of the heat source machine 2 stops, hot water cannot be made. Even if such a situation occurs, the hot water supply system 1 is provided with an emergency mode so that the hot water in the hot water storage tank 3 can be used for a long time.

The control device 5 includes an emergency mode valid / invalid setting means 51 for setting the emergency mode valid / invalid, an emergency setting means 52 for setting each setting item used in the emergency mode executed in an emergency, and an emergency. The hot water storage tank 3 is provided with estimated time confirmation means 53 for calculating and displaying a hot water estimated time based on the temperature and amount of hot water in the hot water storage tank 3 and an emergency mode execution means 54 for executing an emergency mode.
The emergency mode valid / invalid setting means 51 sets whether the emergency mode is valid or invalid.

The emergency setting means 52 is settable when the emergency mode is valid, and sets a decrease range ΔT of the hot water supply set temperature, an average daily use time h _A and a tank capacity V _T in the emergency mode, respectively. .
Here, very mode, the water introduction means 32 described above, up, water was added to the hot water storage tank 3 at lower cost from hot water in the hot water storage tank 3 to the tank lower limit temperature T _min, than the hot water set temperature Supply hot water at a low temperature to the supplier. Thereby, when the situation where hot water cannot be made due to the occurrence of an abnormality in the heat source device 2, the hot water supply duration by the remaining hot water in the hot water storage tank 3 can be extended. An amount of water is introduced into the hot water storage tank 3 in accordance with the decrease width ΔT of the hot water supply set temperature.
The decrease width ΔT of the hot water supply temperature is a value indicating how many degrees Celsius the temperature is reduced from the hot water supply set temperature, and can also be expressed as a ratio to the hot water set temperature. Although by increasing the decrease width [Delta] T hot water supply duration is long, decrease width tolerance limits with the hot water of the intended use, and also the tank lower limit temperature T _min [Delta] T is determined in consideration.

For example, if the working time of the facility where the hot water supply system 1 is installed is 8:00 to 20:00, the average daily usage time h _A is set to 12 hours. This item, as described later, used to calculate the hot water can be estimated time h _U in an emergency.
The tank volume V _T, sets the prescribed capacity of the hot water storage tank 3. When there are a plurality of hot water storage tanks 3, their total capacity is set. This tank capacity V _T may be written in the memory of the control device 5 at the time of system introduction, or may be a value acquired by communication between the hot water storage tank 3 and the control device 5, and is not necessarily determined by the emergency setting means 52. It is not necessary to be a setting item.

The estimated time confirmation unit 53 acquires the current hot water temperature T _W and the hot water amount V _W in the hot water storage tank 3 based on the measured value by the temperature sensor 31, and acquires the hot water supply set temperature T _S. to calculate the estimated time h _U of the hot water supply can be estimated on the basis of 1).

Then, the estimated time confirmation unit 53 displays the calculated estimated time h _U on the screen of the remote controller 6 and the control terminal.
The emergency mode execution means 54 executes the emergency mode in response to the operation of the remote controller 6 or the control terminal.

Next, with reference to FIG. 3, a process when the heat source machine 2 stops operation due to the occurrence of an abnormality will be described. When the heat source device 2 is abnormally stopped (step S1), the control device 5 measures the hot water temperature and the hot water amount in the hot water storage tank 3 measured by the temperature sensor 31 when the emergency mode is set to be effective (Y in step S2). And the hot water supply set temperature for the supply destination is acquired.
Based on these acquired values, the tank capacity V _T set by the emergency setting unit 52, the average daily usage time h _A , and the decrease width ΔT, the estimated time confirmation unit 53 calculates the estimated time during which hot water can be supplied. h _U is calculated and displayed on the screen of the remote controller 6 or the control terminal together with the abnormal stop (step S3).
On the other hand, if the emergency mode is disabled (N in step S2), only the abnormal stop is displayed on the screen, and the processing at the abnormal stop is finished. Thereafter, the emergency mode can be validated by the emergency mode valid / invalid setting means 51. In that case, the processing in and after step S3 for displaying the estimated time h _U by estimating time confirmation unit 53 is performed.

The remote control 6 and the control terminal of the screen, along with the estimated time h _U, and a button to perform very mode are displayed buttons setting change. Administrators after confirming estimated time h _U, if it is determined that the hot water at the estimated time h _U may be sustained (Y in step S4), and press the emergency button. Then, the emergency mode is executed by the emergency mode executing means 54 (step S6). Specifically, the water introduction means 32 introduces water into the hot water storage tank 3 according to ΔT, so that the hot water temperature in the hot water storage tank 3 is lowered. Measurement value measured by the temperature sensor 31, when it reaches the hot water set temperature T _S to a ΔT only low temperature, to stop the water introduction into the hot water storage tank 3.

Short estimated at time h _U displayed in step S4, or if a long and determined (N in step S4), and the administrator presses the setting change button. Then, by performing the operation of changing the reduction rate [Delta] T on the screen, when the emergency setting means 52 resets the decrease width [Delta] T (step S5), and the estimated time confirmation unit 53, the estimated time h _U again Calculate and display (step S3). Administrators can repeat steps S3~S5 until appropriate estimated time h _U, estimated time h _U is after confirming that it is appropriate to perform very mode (step S6).
Thereafter, when the control device 5 receives a hot water use request from the supply destination, it supplies hot water in the hot water storage tank 3.

As described above, in the hot-water supply system 1 of this embodiment, the emergency operation of the heat source unit 2 is stopped, emergency mode applied to the hot water storage tank 3, the water in accordance with the reduction range ΔT from the hot water set temperature T _S As a result, the time required to stop hot water supply can be extended. Even if the manager does not grasp the hot water supply set temperature of the supply destination, the administrator can reliably lower the hot water supply temperature only by setting ΔT. At this time, hot water having a temperature lower than the preset hot water supply temperature by ΔT is supplied to the supply destination, but it is possible to avoid the inconvenience that hot water cannot be used at all because the hot water in the hot water storage tank 3 is depleted at an early stage.

Also, the estimated time confirmation unit 53, after confirming the hot water can be estimated time h _U, since so as to perform very mode, not inadvertently very mode is executed. Administrator, through confirmation of estimated time h _U, after having determined according to the need for water introduced into the hot water storage tank 3 to the situation, it is possible to perform very mode.
Moreover, after confirming the estimated time h _U, it is possible to reconfigure the decrease width [Delta] T, it is possible to perform a hot water supply duration, and a hot water supply temperature very mode appropriately-balanced [Delta] T.

Although in the present embodiment was expressed by calculating the estimated time h _U, calculates a coefficient C _U indicating the estimated time by the following equation (2), and displays the coefficients C _U, or the coefficient C _U. 1 to You may display what converted into index values, such as 10, as a scale which shows estimated time.

Here, in the hot water supply system of the present invention, as means for lowering the hot water supply temperature according to ΔT in an emergency when the operation of the heat source device 2 is stopped, the water introduction means 32 or the hot water supply path 4 as in the first embodiment is used. An emergency water mixing means for mixing water into the hot water is selectively provided. This selection, as shown in FIG. 4, the hot water set temperature T _S is performed based on whether the larger than the tank lower limit temperature T _min.
When the hot water supply set temperature T _S is larger than the tank lower limit temperature T _min (Y in step S11), in order to have a reduction allowance to the tank lower limit temperature T _min that ensures the hygiene of hot water in the hot water storage tank 3, The water introduction means 32 for introducing water into the hot water storage tank 3 is selected (steps S13 and S14). On the other hand, hot water set temperature T _S is the following situations tank lower limit temperature T _min, water mixing means is selected to mix the water in hot water of the hot water supply path 4 (step S15).

Here, as shown in FIG. 4, classification and hot water set temperature T _S, the temperature T _O of the hot water hot water is supplied to the hot water storage tank 3 made _(hot water temperature) by the heat source unit 2, an embodiment of the present invention can do.
Is greater than the hot water set temperature _{T S} is the tank lower limit temperature _{T min} (at step S11 Y), furthermore, if the hot water temperature _{T O} and hot water set temperature _{T S} and the same (or nearly the same) (in step S12 Y) As shown in FIG. 5A, the hot water supply system 1 guides the hot water taken out from the hot water storage tank 3 to the supply destination through the hot water supply path 4 as it is. Such a case is referred to as Case A. Case A corresponds to, for example, the case where the hot water temperature T _O is 90 ° C. and the hot water supply set temperature T _S is substantially 90 ° C.
In this case A, in the event of an emergency, it is sufficient to introduce water into the hot water storage tank 3 according to ΔT by the water introduction means 32 as in the first embodiment (step S13).

On the other hand, when the hot water temperature T _O ≠ the hot water supply set temperature T _S (N in step S12), the hot water supply system 1 has a water mixing means (normally used here) as shown in FIG. It can be judged that it is provided with 41) (referred to as water mixing means). Hot water That is, in the hot water system 1, during normal, the hot water is stored is supplied to the hot water temperature T _O at the hot water storage tank 3, by mixing water with normal time water mixing means 41 in the middle of the hot-water supply path 4 The temperature is decreasing. Such a case is referred to as Case B. Case B corresponds to, for example, the case where the tapping temperature T _O is 90 ° C. and the hot water supply set temperature T _S is approximately 70 ° C.
In this case B, as in the case A, water is introduced into the hot water storage tank 3 by the water introduction means 32 according to ΔT in an emergency (step S14). Here, since the temperature of the hot water supplied to the normal water mixing means 41 has already been lowered by the water introduction means 32, the water mixing by the normal water mixing means 41 is not performed.
In such a case B, in an emergency, water is introduced into the hot water storage tank 3 by the water introduction means 32 according to ΔT, as in the first embodiment.

In step S11 in the N (when the hot water set temperature _{T S} is less than the tank lower limit temperature _{T min),} based on the tank lower limit temperature _{T min,} the hot water system 1, like the case B, normal Tokimizu mixing means 41 Can be judged. Such a case C corresponds to, for example, a case where the tapping temperature T _O is 90 ° C. and the set hot water temperature T _S is 50 ° C.
In this case C, since water cannot be introduced into the hot water storage tank 3, as shown in FIG. 5C, an emergency water mixing means 42 is provided as means for lowering the hot water supply temperature. On the way, the hot water supply temperature is lowered by mixing water in an amount corresponding to ΔT (step S15).
The emergency water mixing means 42 includes a flow control valve 401 that controls the flow rate of water to adjust to a hot water supply set temperature, a mixing valve 402 that mixes the flow-controlled water with hot water in the hot water supply path 4, and a mixing valve. And a temperature sensor 403 that measures the hot water temperature downstream of 402. The normal water mixing means 41 is formed in substantially the same manner as the emergency water mixing means 42.
The emergency water mixing means 42 is located upstream of the normal water mixing means 41 in the hot water supply path 4. For this reason, as in the case B, since the temperature of the hot water supplied to the normal water mixing means 41 has already been lowered by the emergency water mixing means 42, the water mixing by the normal water mixing means 41 is not performed.

In such a case C as well, as in the case A and the case B, the emergency process is performed by the same procedure as shown in FIG. 3, but the operation of the emergency mode is performed in the emergency mode. By controlling the control valve 401, the hot water in the hot water supply path 4 is mixed with water at a flow rate corresponding to ΔT, thereby lowering the hot water temperature. When the measured value by the temperature sensor 403 reaches a temperature that is lower by ΔT from the hot water supply set temperature, the water mixing by the emergency water mixing means 42 is stopped.
In any of the above cases A to C, since the hot water supply duration can be extended, the risk and damage due to the hot water supply being stopped due to the fact that hot water is not produced by stopping the heat source machine 2 can be suppressed.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
In the first embodiment, hot water is supplied to each supply destination at a temperature that is lower by ΔT in an emergency, but in the second embodiment, hot water is supplied to a first priority supply destination that has a high priority. Water is supplied to the supply destination of the second priority with a low priority.
In the hot water supply system of the present embodiment shown in FIG. 6, a first path 61 that is a hot water supply path connected to the first priority supply destination 1 and a second path 62 that is a hot water supply path connected to the second priority supply destination 2. Are provided in separate systems, and an electromagnetic valve 63 is provided so that the second path 62 can be disconnected from the hot water storage tank 3 in an emergency. In normal times, the first path 61 and the second path 62 are connected to each other, and hot water in the hot water storage tank 3 is supplied to each supply destination through the first path 61 and the second path 62.

In the present embodiment, the emergency setting means 52 (FIG. 2), sets the ratio R _P of the feed amount by the first path 61 to the feed amount by the entire hot water system 1. For example, the supply amount of 5000 liters by the entire hot water system 1, the supply amount of the first path 61 if 2,000 liters, _{R P} is 0.4 (40%).
The ratio _{R P} is used for calculation of the estimated time _{h U} based on the following equation (3).

The emergency mode execution means 54 performs the water introduction by the water introduction means 32 or the water mixing by the emergency water mixing means 42 according to the classification of the above cases A to C as the operation of the emergency mode, and the electromagnetic valve 63 is set. By controlling, the second path 62 is separated from the hot water storage tank 3 and also separated from the first path 61.
Then, the hot water in the hot water storage tank 3 is supplied through the first path 61 only to the first priority supply destination having a high priority. On the other hand, the water sent to the second path 62 by the water mixing means 41 is supplied to the supply destination of the second priority having a low priority.
According to the present embodiment, not only can the time until hot water supply stop be further extended, but also by providing means for concentrating hot water in the hot water storage tank to a supply destination that truly needs hot water supply in an emergency. , Can increase user satisfaction.

The priority is appropriately determined according to the purpose of use of the hot water at the supply destination.
Further, the present embodiment is applied to the case B described above, but can also be applied to the case A and the case C.

By the way, although only one ΔT is set in the first embodiment described above, ΔT can also be set for each hot water storage tank 3 by applying the second embodiment. For example, a water path that leads from one hot water storage tank 3 of two hot water storage tanks 3 to a half of a plurality of supply destinations and a water path that leads from the other hot water storage tank 3 to the remaining supply destinations are configured in different systems. Keep it.
In normal times, these water paths are connected to each other, and hot water in the two hot water storage tanks 3 is supplied to each supply destination without distinction of the water paths. In an emergency, these water paths are disconnected by a switching valve or the like.
If it carries out as mentioned above, since temperature can be lowered according to ΔT for every hot water storage tank 3, since ΔT is small, it is used for hot water supply for a short time at high temperature, and since ΔT is large, it is low temperature for a long time. The hot water storage tank 3 can be properly used for hot water use.

The present invention also allows the control device 5 to automatically execute the emergency mode immediately after the abnormal stop of the heat source device 2. Thereby, the hot water supply duration can be extended even when the manager is absent.
Moreover, this invention is applicable not only to the heat pump hot-water supply system mentioned above but to a gas combustion type and an electric heating type hot-water supply system.
In addition to the above, as long as the gist of the present invention is not deviated, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 1 Hot water supply system 2 Heat source machine 3 Hot water storage tank 4 Hot water supply path 5 Control apparatus 6 Remote control 31 Temperature sensor 32 Water introduction means 41 Normal water mixing means 42 Emergency water mixing means 51 Emergency mode valid / invalid setting means 52 Emergency setting means 53 Estimated time confirmation means 54 Emergency mode execution means 61 First path 62 Second path 63 Solenoid valve (switching valve)

Claims (3)

A heat source machine,
A hot water storage tank for storing hot water produced by being heated by the heat source device;
A hot water supply system comprising a hot water supply path for guiding hot water in the hot water storage tank to a supply destination,
A hot water supply temperature decrease width setting means for setting a decrease width of the hot water supply set temperature to the supply destination in an emergency mode executed in an emergency when an abnormality occurs in the hot water supply system;
And at least one of water introduction means for introducing water into the hot water storage tank according to the lowering width, and water mixing means for mixing water according to the lowering width with hot water in the hot water supply path ,
The water introduction means and the water mixing means are selectively provided based on a hot water supply set temperature to the supply destination.
A hot water supply system characterized by that. Based on the capacity of the hot water storage tank, the amount and temperature of the hot water in the hot water storage tank, the hot water supply set temperature to the supply destination and the lowering range, an estimated time for hot water supply or a scale indicating the estimated time is confirmed. Provided with an estimated time confirmation means,
The hot water supply system according to claim 1 . The plurality of supply destinations are classified into a first priority and a second priority having a lower priority,
A first path that leads from the hot water storage tank to the supply destination of the first priority;
A second path leading from the hot water storage tank to the supply destination of the second priority;
A switching valve for disconnecting the second path from the hot water storage tank in the emergency,
The hot water supply system according to claim 1 or 2 .

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