JP5322992B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system.

  Patent Document 1 discloses a hot water supply system including a heater that heats water using the amount of heat of the atmosphere. A heater that uses the amount of heat of the atmosphere is energy efficient. On the other hand, the heating amount per unit time of the heater using the amount of heat of the atmosphere is small, and the situation where the heating amount per unit time is insufficient for the amount of tapping heat per unit time occurs. There arises a situation in which it is not possible to satisfy the heat demand such as hot water supply service with a large amount of hot water per unit time, for example, hot water supply (hot water filling) to a shower or bathtub.

  Therefore, a hot water supply system that combines a heater that uses the amount of heat of the atmosphere and a hot water storage tank has been developed. In this hot water supply system, hot water heated over time by a heater that uses the amount of heat of the atmosphere is stored in a hot water storage tank. When combined with a heater that uses the amount of heat in the atmosphere and a hot water storage tank, it can be heated efficiently using the amount of heat in the atmosphere, and it can handle showers and hot water fillings that have a large amount of hot water per unit time. Is possible.

  In the above system, it is necessary to prevent the hot water stored in the hot water tank from being consumed during showering or hot water operation. Inevitably, a large hot water tank is needed. However, there are cases where a large hot water tank cannot be installed. Therefore, a so-called hybrid hot water supply system has been proposed.

As disclosed in Patent Document 1, the hybrid hot water supply system includes a second heater in a path connecting the hot water storage tank and the hot water use location. As the second heater, a heater that has a large heating amount per unit time and can be used for showering or hot water filling is used. If you prepare a second heater, you can continue to supply hot water after the hot water stored in the hot water tank is exhausted (hereinafter sometimes referred to as “hot water out”), and downsize the hot water tank be able to.
A heater that uses the amount of heat of the atmosphere can be heated with high efficiency, but is a low-speed heater that heats at a low speed with a small amount of heating per unit time. The second heater is a rapid heater that heats at a rapid speed with a large heating amount per unit time. Unfortunately, rapid heaters are less energy efficient than slow heaters that use the amount of heat that the atmosphere has.

  In the hybrid hot water supply system, hot water is heated with high efficiency by using a low-speed heater that uses the amount of heat of the atmosphere, and hot water is supplied with a rapid heater when hot water runs out. Hybrid hot water supply systems have the great advantage of being able to reduce the size of hot water storage tanks, and are beginning to spread.

JP 2006-300473 A

  The hybrid hot water supply system has both the merit that the hot water tank can be downsized and the demerit that the heating efficiency is lowered when the rapid heater is used. In the conventional hybrid hot water supply system, when hot water is consumed after the hot water stored in the hot water tank is exhausted, hot water is supplied using a rapid heater. If a rapid heater is used, the demerit that heating efficiency falls will appear as it is.

  In this invention, the demerit of a hybrid type hot-water supply system is reduced by reducing the opportunity that the demerit that heating efficiency will fall if a rapid heater is utilized is expressed. In the present invention, the conventional method of supplying hot water using a rapid heater after running out of hot water has been reviewed. As a result, it was created by finding that even hot water supply after running out of hot water can be handled with a high-efficiency low-speed heater.

The hot water supply system of the present invention includes a low-speed heater that heats water using the amount of heat of the atmosphere, a hot water tank that stores hot water heated by the low-speed heater, and a hot water path that discharges hot water from the hot water tank. The mixing tap water path that joins the hot water path, the mixing ratio adjuster that adjusts the ratio of the amount of hot water flowing through the hot water path and the amount of cold water flowing through the mixing tap water path, and the mixed hot water that has passed through the mixing ratio adjuster Open and close the hot water path, the hot water path that leads the hot water tap, the rapid heater that heats the water that flows through the hot water path or the hot water path, the hot water path that branches from the mixed hot water path, and leads the hot water to the bathtub An on-off valve and a controller are provided. The controller stores the temperature of the mixed hot water to be supplied to the bathtub (filling temperature), and controls the above-described mixing ratio adjuster and the on-off valve. The controller is
1) a process for monitoring the occurrence of an event in which the temperature of the hot water discharged from the hot water tank to the hot water path is lower than the set temperature of the hot water;
2) A process for determining whether or not the entire amount of hot water discharged from the hot water storage tank is flowing through the hot water filling path when the event 1) occurs.
3) In 2), when the “total amount” is reached, the on-off valve is closed, and when “not full”, the operation of starting the rapid heater is performed.

Since the hot water supply system described above stores hot water heated by a low-speed heater and supplies hot water, it can enjoy the advantage of heating with high efficiency using the amount of heat of the atmosphere. Furthermore, since the rapid heater corresponding to a hot water shortage is provided, the advantage that a hot water storage tank can be reduced can be enjoyed. In addition, the occurrence of hot water breakage is monitored by the above 1), and when the hot water breakage occurs, the process of 2) above is carried out. It is determined whether or not a hot water outage occurred during the hot water supply service. When only the hot water supply service other than the hot water operation is performed and when the hot water service other than the hot water operation and the hot water operation are performed simultaneously, it is determined that the other hot water service is performed. If other hot water supply services are being implemented, it is determined that the amount is not “total” in the process of 3), and the operation of the rapid heater is started. If a hot water supply service other than hot water filling is being implemented, the hot water supply service is continued using a rapid heater after a hot water outage occurs. On the other hand, if hot water runs out while performing only the hot water filling operation, it is determined as “total amount” in the process of 3), and the on-off valve is closed. That is, the hot water filling route is closed and the hot water filling operation is interrupted. In the case of hot water filling operation, it may be possible to increase the time required for the hot water filling process, and therefore it is allowed to interrupt the hot water filling operation.
This hot water supply system does not use the conventional method of supplying hot water using a rapid heater after running out of hot water, and does not use the rapid heater when only hot water filling operation is performed. As a result, the amount of heat of the atmosphere can be used for heating for hot water operation, and the advantage of high efficiency can be enjoyed. In other words, it is possible to prevent the demerit of a decrease in heating efficiency that occurs when a rapid heater is used for hot water filling.

  Rather than interrupting the hot water filling evenly when the hot water filling operation is performed only, the hot water filling operation is performed using the rapid heater when the following conditions are met. The hot water filling operation may be interrupted only when the following conditions are not satisfied.

(First Case) The controller is provided with a switch that allows the user to switch between efficiency priority and time priority. When time priority is selected with the switch, when the event of 1) occurs, a process for starting the operation of the rapid heater is performed instead of the processes of 2) and 3).
If this condition is attached, if a hot water outage occurs while performing only the hot water filling operation with the priority on efficiency being selected, the hot water filling operation is interrupted and the hot water running out under other conditions. If this occurs, use a rapid heater to continue hot water supply. That is, when a hot water outage occurs during a hot water supply service other than a hot water filling operation, or when a hot water outage occurs during another hot water supply service at the same time as the hot water filling operation, or a hot water filling If time priority is selected even if hot water runs out during operation only, hot water supply is continued using a rapid heater. The user can select between efficiency priority and time priority. If efficiency priority is selected, the amount of heat of the atmosphere can be used for heating for hot water filling, and the chances for a decrease in heating efficiency to be realized can be reduced.

(Second case) The controller is provided with a hot water filling reservation switch and a hot water filling immediate start switch. When the immediate operation switch is operated and the event 1) occurs, the controller A process for starting the operation of the heater is performed.
When this condition is attached, the hot water filling operation is interrupted when hot water runs out while only the hot water filling operation based on the operation of the reservation switch is performed. If hot water runs out under other conditions, for example, even if only hot water operation is performed, but it is based on the operation of the switch for immediate start, use a rapid heater after hot water runs out. Continue hot water operation.

(Third case) When the event of 1) occurs, the controller calculates the time required to obtain the amount of hot water that needs to be supplied to the bathtub with the low-speed heater, and the time If the time is equal to or longer than the predetermined time, the process of starting the operation of the rapid heater is performed instead of the processes of 2) and 3) when the event of 1) occurs.
When this condition is attached, if hot water runs out while performing only the filling operation, the time required to heat the remaining amount of hot water with a low-speed heater is calculated, and the time Is less than the predetermined time, the hot water filling operation is stopped and the process waits for the predetermined time to elapse. Since the remaining amount of hot water heat is secured by a low-speed heater after a predetermined time, the hot water filling operation can be resumed. If the calculated time is equal to or longer than the predetermined time, the rapid heater is operated and the filling operation is continued. Since there are many cases where the filling time is allowed to be delayed within a predetermined time, it is effective to attach this condition.

It is preferable that the controller includes an operation device for the user to set the predetermined time.
By the above, the user can determine the time to wait for efficiency priority. For example, the user can set a condition such as waiting for efficiency priority within 15 minutes or waiting for efficiency priority within 30 minutes.

It is preferable that the controller performs a process of opening the on / off valve after the time necessary for obtaining the amount of heat of the hot water that needs to be supplied to the bathtub after the on / off valve is closed in 3) with a low-speed heater. .
According to this, when a hot water outage occurs and the hot water filling operation is interrupted, the hot water filling operation is resumed while being heated by the low-speed heater by a necessary amount of heat.

In order to determine whether the time required to obtain the amount of heat (referred to as additional heat) that needs to be additionally supplied to the bathtub after interruption of the hot water operation (referred to as additional time) has elapsed, Various aspects are possible.
(Aspect 1) A temperature profile in the depth direction in the hot water storage tank is measured, and it is assumed that the necessary time has elapsed when the additional amount of hot water is stored.
(Aspect 2) Since hot water heated to a predetermined temperature by the low-speed heater is sent to the upper part of the hot water tank, temperature stratification is formed in the hot water tank. It is assumed that the necessary time has elapsed when the thickness of the hot water layer increases and reaches the bottom of the hot water tank.
(Aspect 3) It is assumed that the necessary time has elapsed when the time obtained by dividing the additional heat amount by the heating amount per unit time by the low-speed heater has elapsed.
(Aspect 4) It is assumed that the necessary time has elapsed when the surplus time has elapsed from the time of aspects 1 to 3.
(Aspect 5) Let T be the time required to supply hot water that needs to be supplied to the bathtub. It is assumed that the necessary time has elapsed at a time point earlier than the time point of modes 1 to 4 by time T.
According to any of Embodiments 1 to 5, the hot water filling can be completed with only a low-speed heater.

According to the hot water supply system of the present invention, it is possible to reduce the chance of a decrease in heating efficiency due to a rapid heater, and maximize the advantages of a heater that heats water with high efficiency using the amount of heat of the atmosphere. Can enjoy.
In addition, when various conditions described in the dependent claims are added, it is possible to distinguish between cases where a delay in filling time is allowed and cases where it is not allowed. The advantages of the low-speed heater that heats with high efficiency can be enjoyed to the maximum. Both efficiency and usability can be achieved.

System diagram of the hot water supply system of the embodiment Processing procedure diagram of Embodiment 1 Processing procedure diagram of embodiment 2 Processing procedure diagram of embodiment 3 Processing procedure diagram of embodiment 4 Processing procedure diagram of embodiment 5 Processing procedure diagram of embodiment 6

The technical features of the embodiments described below are listed.
(Characteristic 1) When the detected temperature of the hot water tank lower thermistor becomes equal to or higher than the reference temperature, it is determined that the necessary time has elapsed and the on-off valve is opened.
(Characteristic 2) When a predetermined margin time has elapsed after the detected temperature of the hot water tank lower thermistor is equal to or higher than the reference temperature, it is determined that the necessary time has elapsed and the on-off valve is opened.
(Characteristic 3) When the time required to store the hot water of the reference temperature in the hot water storage tank has elapsed, it is determined that the required time has elapsed and the on-off valve is opened.
(Feature 4) At a time later than the time of Feature 3 by a predetermined margin time, it is determined that the necessary time has elapsed, and the on-off valve is opened.
(Characteristic 5) At a time earlier than the time of Characteristic 3 by a predetermined error time, it is determined that the necessary time has elapsed, and the on-off valve is opened.
(Characteristic 6) When the time required for heating the amount of heat insufficient for completion of the hot water filling with the low-speed heater has elapsed, it is determined that the necessary time has elapsed, and the on-off valve is opened.
(Feature 7) At a time later than the time of Feature 6 by a predetermined margin time, it is determined that the necessary time has elapsed, and the on-off valve is opened.
(Characteristic 8) At a time earlier than the time of characteristic 6 by a predetermined error time, it is determined that the necessary time has elapsed, and the on-off valve is opened.
(Feature 9) A time Tq required to heat the amount of heat insufficient for completion of filling with a low-speed heater and a time Tw required for filling the amount of hot water insufficient for completion of filling are calculated. -Tw
When elapses, it is determined that the necessary time has elapsed, and the on-off valve is opened.
(Feature 10) At a time later than the time of Feature 9 by a predetermined margin time, it is determined that the necessary time has elapsed, and the on-off valve is opened.
(Characteristic 11) At a time earlier than the time of Feature 9 by a predetermined error time, it is determined that the necessary time has elapsed, and the on-off valve is opened.

  The hot water supply system 2 of an Example is demonstrated with reference to the system diagram of FIG. As shown in FIG. 1, the hot water supply system 2 includes a low-speed heater 16, a hot water storage tank 22, a hot water path 34a for discharging hot water from the hot water storage tank 22, a tap water path 28c for mixing that joins the hot water path 34a, A mixing ratio adjuster 36 that adjusts the ratio of the amount of hot water flowing through the hot water path 34a and the amount of cold water flowing through the mixing tap water path 28c, and a mixed hot water path 34b that guides the mixed hot water that has passed through the mixing ratio adjuster 36 to the hot water tap 48. A rapid heater 40 that heats water flowing through the mixed hot water path 34b, a hot water path 50 that branches from the mixed hot water path 34b and guides the mixed hot water to the bathtub 64, an on-off valve 52 that opens and closes the hot water path, A controller 66 that stores the temperature of the mixed hot water to be supplied to the bathtub 64 (hot water setting temperature) and controls the mixing ratio adjuster 36 and the on-off valve 52 is provided.

  The low-speed heater 16 includes a compressor 4, a first heat exchanger 6, a pressure reducing valve 10, a second heat exchanger 14, and a heat medium path 8 that circulates the heat medium in that order. A fan 12 that blows air to the second heat exchanger 14 is also provided. The compressor 4 compresses and heats the heat medium, and passes the heated heat medium through the heat medium path 6 a of the first heat exchanger 6. While the high-temperature heat medium passes through the heat medium path 6a, the water flowing through the water path 6b is heated. The heating medium heated with water passes through the pressure reducing valve 10 and is depressurized and cooled. While the cooled heat medium passes through the second heat exchanger 14, it is heated by absorbing the amount of heat of the atmosphere. The heating medium heated in the atmosphere returns to the compressor 4 and is heated again. The low-speed heater 16 has high heating efficiency because it uses the amount of heat that the atmosphere has. That is, a large amount of heating can be obtained with small energy consumption. However, the amount of heating per unit time is small and, for example, the amount of discharged hot water per unit time during hot water filling operation cannot be satisfied. It does not have the amount of heating per unit time that can satisfy the required amount of heat output per unit time in real time.

  A circulation path 20 circulates between the hot water tank 22 and the first heat exchanger 6. A circulation pump 18 is inserted in the circulation path 20. When the circulation pump 18 is operated, water is sucked out from the lower part of the hot water tank 22, heated while flowing through the water path 6 b of the first heat exchanger 6, and heated water (hot water) enters the upper part of the hot water tank 22. Returned. The temperature of hot water returned to the hot water tank 22 is adjusted to a reference temperature by a thermistor (not shown). On the upper part of the hot water tank 22, hot water having a reference temperature is stored in layers. As the amount of hot water storage increases, the thickness of the hot water layer at the reference temperature increases. When the hot water is completely stored, the hot water layer at the reference temperature reaches the lower part of the hot water tank 22. Since temperature stratification is performed in the hot water storage tank 22, hot water having a reference temperature can be discharged even if the amount of stored hot water is reduced. The hot water tank 22 is provided with a hot water tank upper thermistor 32 and a hot water tank lower thermistor 30.

  A tap water path 28 is connected to the bottom of the hot water tank 22. The tap water path 28 connects the water pipe connection port 24 and the bottom of the hot water tank 22. The tap water path 28 has a pressure reducing valve (not shown) inserted therein, and keeps the water pressure in the hot water tank 22 constant. When hot water is discharged from the hot water tap 48 or the like and the water pressure in the hot water storage tank 22 decreases, water is replenished from the tap water passage 28. A tap water path 28 c for mixing branches from the tap water path 28 toward the mixing ratio adjuster 36. The tap water path 28 includes a pre-branching tap water path 28a, a post-branching tap water path 28b, and a mixing tap water path 28c. A tap water thermistor 26 is installed in the tap water path 28.

  A hot water path 34 extends between the upper part of the hot water tank 22 and the hot water tap 48. A mixing ratio adjuster 36 is inserted in the hot water path 34, and the hot water hot water path 34 a and the tap water path 28 c for mixing are joined by the mixing ratio adjuster 36. The mixing ratio adjuster 36 adjusts the ratio of the amount of hot water flowing through the hot water supply hot water path 34a and the amount of cold water (tap water) flowing through the mixing tap water path 28c. The mixing ratio adjuster 36 adjusts the ratio of the amount of hot water to join and the amount of cold water to adjust the temperature of the mixed hot water. The mixed hot water adjusted by the mixing ratio adjuster 36 flows through the mixed hot water path 34b.

The hot water tank 22 is small, and a situation may occur in which all of the hot water stored in the hot water is consumed during the hot water operation. For this purpose, the rapid heater 40 is inserted into the mixed hot water path 34b. The rapid heater 40 includes a burner 44 and a third heat exchanger 42 that heats the mixed hot water using the combustion heat of the burner 44. Since the rapid heater 40 does not use the amount of heat of the atmosphere, the heating efficiency is lower than that of the low-speed heater 16. That is, in order to obtain the same heating amount, the rapid heater 40 needs to input more resources than the case of using the low-speed heater 16, and the heating cost is higher than that of the low-speed heater 16. However, the heating amount per unit time of the rapid heater 40 is large. The amount of heat required for tapping per unit time can be satisfied in real time.
In this embodiment, the rapid heater 40 is set in the mixed hot water path 34b, but the rapid heater 40 may be set in the hot water supply hot water path 34a.

The hot water filling path 50 branches off from the mixed hot water path 34b. The hot water filling passage 50 is branched downstream of the rapid heater 40, and the hot water heated by the rapid heater 40 can flow into the hot water filling route 50. An on-off valve 52 is inserted in the hot water filling path 50. The hot water filling path 50 is connected to the bath circulation path 54. When the on-off valve 52 is opened, the hot water flowing through the hot water filling passage 50 flows through the bath circulation passage 54 as shown by the solid line arrow in the figure, and the hot water is sent to the bathtub 64. A bath circulation pump 56 and a fourth heat exchanger 58 are installed in the bath circulation path 54. When the bath circulation pump 56 is actuated, the bath water circulates as shown by the dashed arrows in the figure. A high-temperature heat medium flows through the heat medium path 58 b of the fourth heat exchanger 58. The bathtub water is heated while flowing through the bathtub water path 58a of the fourth heat exchanger 58. When the bath circulation pump 56 is operated, the bath water is replenished. When the bath water is replenished, a high-temperature heat medium is sent to the inlet 60 of the fourth heat exchanger 58 and the heat medium coming out from the outlet 62 is reheated. A burner 44 may be used as a heating source of the heat medium, or a burner different from the burner 44 may be provided.
A mixed hot water thermistor 38 is installed upstream of the rapid heater 40 in the mixed hot water path 34b, and a hot water hot water thermistor 46 is installed downstream.

  68 shown is an atmospheric temperature thermistor, and 66 shown is a controller. The controller 66 inputs detection values of various thermistors 26, 30, 32, 38, 46, etc., and the compressor 4, the fan 12, the circulation pump 18, the mixing ratio adjuster 36, the burner 44, the on-off valve 52, and the bath circulation. The pump 56 and the like are controlled. The controller 66 has an operation unit for the user to set the temperature of the mixed hot water discharged from the hot water tap 48 (hot water set temperature) and the temperature of the mixed hot water charged to the bathtub 64 (hot water set temperature). Has been. The hot water temperature (reference temperature) stored in the hot water storage tank 22 is about 60 ° C., and the hot water supply set temperature and the hot water set temperature are both lower than the reference temperature. The user can use the controller 66 to set the amount of hot water (water amount or water level) when the hot water filling operation is terminated, can reserve the hot water filling operation, or can immediately make the hot water filling operation. Can also be started. Moreover, it can select from the efficiency priority mentioned later and time priority, can set the predetermined time mentioned later, and can also set the minimum amount of hot water mentioned later. The controller 66 is provided with an operating device for the user to perform various setting operations.

FIG. 2 shows a processing procedure of the first embodiment. When the hot water filling operation is started in step S <b> 2, the on-off valve 52 is opened and the mixing ratio adjuster 36 is controlled to start supplying the mixed hot water adjusted to the hot water filling set temperature to the bathtub 64. In step S4, it is determined whether or not the condition for terminating the hot water filling operation has been obtained. If the set hot water amount or the set water level has been reached by the hot water filling operation, the hot water filling end condition is satisfied, and the process proceeds to step S20 to end the hot water filling operation.
While the hot water filling end condition is not satisfied, the hot water temperature is compared with the hot water filling temperature in step S6. The hot water temperature in step S6 is known from the detected temperature of the hot water tank upper thermistor 32 or the detected temperature of the mixed hot water thermistor 38. When the tapping temperature falls below the hot water set temperature, the mixing ratio adjuster 36 sets the mixing ratio of tap water to zero, and the mixed hot water thermistor 38 indicates the tapping temperature.
The temperature of the hot water stored in the hot water tank 22 is a reference temperature, which is higher than the hot water setting temperature. While the hot water does not run out, step S6 becomes no and the hot water filling operation is continued. If the filling condition is satisfied while step S6 is NO, the process proceeds from step S4 to step S20, and the filling process is terminated. The hot water filling operation has been completed with the hot water storage in the hot water tank 22.

  If hot water runs out before the hot water filling end condition is satisfied, step S6 becomes YES. In step S8, it is determined whether a hot water supply operation other than hot water filling is being performed. That is, it is determined whether or not all of the hot water discharged from the hot water tank 22 is supplied to the bathtub 64. In this embodiment, if all the hot water taps 48 are closed, it is determined that only the hot water filling operation is being performed. In step S8, whether or not a hot water supply operation other than the hot water filling operation is being performed is determined regardless of whether or not the hot water filling operation is simultaneously performed. If hot water is supplied from at least one hot water tap 48, step S8 is YES. If hot water runs out while a hot water supply operation other than hot water filling is being performed, the rapid heater 40 is operated to continue the hot water supply operation. If hot water runs out during the hot water filling operation simultaneously with other hot water supply operations, the rapid heater 40 is operated to continue the hot water filling operation.

If hot water runs out during only the hot water filling operation (while all the hot water taps 48 are closed), the answer is no in step S8. In this case, the on-off valve 52 is closed in step S10, and the hot water filling operation is interrupted. Thereafter, the operation of the low-speed heater 16 is started in step S14, and it is determined whether or not the time necessary for heating the amount of heat necessary for resuming the filling operation by the low-speed heater 16 has elapsed ( S16). There are various modes of determination in step S16, which will be described later. Step S18 is performed after the time necessary for heating the amount of heat necessary for resuming the hot water filling operation by the low-speed heater 16 has elapsed. In step S18, the on-off valve 52 is opened and the hot water filling operation is resumed. After execution of step S18, the process returns to step S4.
In the above embodiment, when it is determined in step S6 and step S8 whether hot water has run out during only the hot water operation, and when hot water has occurred during only the hot water operation. In step S10, hot water filling is interrupted. Thereafter, heating is performed by the efficient low-speed heater 16 (step S14), and the heating amount necessary for the hot water filling operation is covered only by the efficient low-speed heater 16.
Since attention has been paid to the fact that there is time in the hot water filling operation, it is possible to better enjoy the advantages of the high efficiency of the low-speed heater 16 as compared with the conventional hybrid hot water supply system.

FIG. 3 shows a processing procedure of the second embodiment. The same processes as those in the first embodiment are denoted by the same step numbers, and redundant description is omitted.
In the second embodiment, step S9 is added. As a result, when hot water runs out,
(1) Whether only hot water filling operation is carried out or other hot water supply operation is carried out (S8)
(2) Whether the user has selected efficiency priority using the controller 66 (S9)
Therefore, the hot water filling operation is interrupted only when the hot water filling operation is performed and the efficiency priority is selected. Others are the same as Example 1.
According to the second embodiment, the user can select whether to pursue high efficiency until the hot water filling operation is interrupted, or to pursue ease of use without interrupting the hot water operation.

Step S16 in FIG. 2 is embodied as step S16a in FIG. When the hot water tank lower thermistor 30 reaches the reference temperature, it can be seen that the hot water tank 22 has fully stored heat again, and that the time necessary for resuming the hot water filling operation has passed.
Note that step S18 may be performed after a predetermined margin time has elapsed after step S16a becomes yes.

FIG. 4 shows a processing procedure of the third embodiment. The same processes as those in the first embodiment are denoted by the same step numbers, and redundant description is omitted.
In the third embodiment, step S9a is added. As a result, if a hot water outage occurs,
(1) Whether only hot water filling operation is carried out or other hot water supply operation is carried out (S8)
(2) Whether the hot water driving is based on reservation (S9a)
The hot water filling operation is interrupted only when the hot water filling operation is carried out only when the hot water filling operation is based on the reservation. In other words, if the hot water operation is performed because the user has operated the switch that immediately starts the hot water operation, even if the hot water runs out during the hot water operation only, Do not interrupt. When the user operates a switch that immediately starts a hot water filling operation, priority is given to time, and the hot water heater 40 is used to continue the hot water filling operation. Others are the same as Example 1.
According to the third embodiment, priority is given to efficiency during a reservation operation in which the time required for the filling process may be long, and time is given priority when an immediate switch that is operated as needed is operated. The

Step S16 in FIG. 2 is embodied in steps S16b and S16c in FIG. In step S16b, the necessary time until the hot water tank 22 is fully boiled is calculated from the tap water temperature, the atmospheric temperature, the capacity of the hot water tank 22, and the heating amount per unit time of the low-speed heater 16. In step S16c, it is determined whether or not the necessary time has elapsed.
In step S16c, step S18 may be performed after waiting for the time obtained by adding a predetermined margin time to the necessary time calculated in step S16b. Conversely, step S18 may be performed after waiting for the elapse of a time obtained by subtracting a predetermined error time from the required time calculated in step S16b.
Example 2 and Example 3 may be combined. The process from step S10 in FIG. 3 and the process from step S14 to S18 in FIG. 4 may be combined, or the process from step S10 in FIG. 4 and the process from step S14 to S18 in FIG. 3 may be combined.

FIG. 5 shows a processing procedure of the fourth embodiment. The same processes as those in the first embodiment are denoted by the same step numbers, and redundant description is omitted.
In the fourth embodiment, steps S9b and S9c are added. In Example 4, when hot water runs out while performing only the hot water filling operation (S6 becomes yes and S8 becomes no), the heat quantity Q necessary for the hot water filling is heated by 16 with a low-speed heater. The time required to do this is calculated (step S9b) and compared with a predetermined time (step S9c). This predetermined time is a time set by the user using the controller 66, and a user who thinks that he / she can wait up to 10 minutes for efficiency priority is set to 10 minutes and up to 30 minutes for efficiency priority. Users who think they can wait set 30 minutes. If the shortage of heat can be heated by the low-speed heater 16 within that time, the process proceeds to step S10 and the hot water filling operation is interrupted. Within that time, if the insufficient heat quantity cannot be heated by 16 with the low-speed heater, the process proceeds to step S12 and the hot water filling operation is continued using the rapid heater 40. Others are the same as Example 1.
According to the fourth embodiment, priority is given to efficiency if the response can be made within the delay time set by the user, and priority is given to time if the response cannot be made within the delay time set by the user. Efficiency and usability can be followed in a balanced manner.
It should be noted that after calculating the required time in step S9b, the required time required to fill the hot water shortage amount is calculated, and the latter required time is subtracted from the former required time to actually delay the required time. You may ask for. For example, if the time required to heat the insufficient heat calculated in step S9b with the low-speed heater is 30 minutes and it takes 8 minutes to send that much hot water to the bathtub 64, the hot water filling operation is performed after 22 minutes. If the operation is resumed, the required heating amount is obtained by the low-speed heater by 30 minutes after the hot water filling operation is completed. The actual delay time is 22 minutes. In step S9c, the delay time thus calculated may be compared with a predetermined time.

Step S16 in FIG. 2 is embodied as step S16d in FIG. In step S16d, the process waits for the necessary time calculated in step S9b to elapse. If step S16d is YES, the low-speed heater 16 has obtained the heat quantity Q necessary for completion of filling.
In step S16d, step S18 may be performed after waiting for a time obtained by adding a predetermined margin time to the time calculated in step S9b. Conversely, step S18 may be performed after waiting for the elapse of a time obtained by subtracting a predetermined error time from the time calculated in step S9b. As described above, the resumption point of the hot water filling operation may be calculated in anticipation of the time required to send the required amount of hot water to the bathtub.

FIG. 6 shows a processing procedure of the fifth embodiment. The same processes as those in the first embodiment are denoted by the same step numbers, and redundant description is omitted.
In Example 5, when the hot water filling operation is started in Step S2, the operation of the low-speed heater 16 is started (Step S22). If hot water runs out during the hot water filling operation only, the hot water filling amount per unit time is reduced in step S38 thereafter. That is, the heating amount per unit time of the low-speed heater 16 (kcal / min) = (hot water setting temperature−tap water temperature) × the amount of water satisfying the formula of the hot water amount per unit time. In Example 5, hot water filling is performed while hot water can be filled using the amount of heat in the hot water tank, and hot water filling is performed at a rate that matches the capability of the low-speed heater after hot water runs out.

FIG. 7 shows a processing procedure of the sixth embodiment. After the answer in step S34 in FIG. 7 is YES, the processes of the first to third embodiments are performed.
In Example 6, when the hot water filling operation is started in Step S2, the operation of the low-speed heater 16 is started (Step S22). In step S24, the amount of hot water H that can be covered by the hot water stored in the hot water storage tank 22 is calculated from the heat storage amount P of the hot water storage tank 22 at that time, the hot water set temperature, and the tap water temperature. In step S26, the time required to supply only hot water H to the bathtub 64 is calculated. In step S28, it is recalculated that the amount of hot water that can be supplied increases because the operation of the low-speed heater 16 can be continued during that time. Let it be the amount of hot water H ′. In step S32, the corrected hot water volume H 'that can be supplied is compared with the minimum hot water volume. The minimum amount of hot water is the amount of hot water preset by the user using the controller 66, and is smaller than the set amount of hot water when the hot water filling operation is terminated. Set the minimum amount of water that can be bathed. If YES in step S32, only the minimum amount of hot water can be secured, so only the minimum amount of hot water is filled (step S34). If the corrected hot water volume H ′ that can be supplied does not reach the minimum hot water volume, the rapid heater 40 is operated (step S12), and only the minimum hot water volume is filled.
After filling only the minimum amount of hot water, the process proceeds to the embodiment of FIG. 2, the embodiment of FIG. 3, and the embodiment of FIG. In the case of proceeding to the embodiment of FIG. 2, if a hot water outage occurs during the filling operation to the set water amount after filling the minimum amount of water, filling is performed if only the filling operation is performed. The operation is interrupted, and the hot water filling operation is resumed after the required amount of heat is obtained with the low-speed heater. When proceeding to the embodiment of FIG. 3, if efficiency priority is selected, the hot water filling operation is interrupted, and the hot water filling operation is resumed after waiting for the required amount of heat to be obtained by the low-speed heater. In the case of proceeding to the embodiment of FIG. 4, if hot water runs out during the reserved operation, the hot water filling operation is interrupted, and the hot water filling operation is resumed after waiting for the required amount of heat to be obtained by the low-speed heater.
In the above embodiment, a rapid heater is used when a bathing condition is first ensured and then when hot water runs out while filling up to the set amount of water, or when no hot water supply service other than hot water operation is performed. Use only a low-speed heater. Also according to the above embodiment, the opportunity to operate the rapid heater before completion of filling is reduced, and the advantages of the low-speed heater can be fully utilized.
(Other examples)

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
For example, although the rapid heater 40 is installed in the mixed hot water path 34a in FIG. 1, the rapid heater 40 may be installed in the hot water supply hot water path 34a. In FIG. 1, description of many components, such as a pressure reducing valve installed in the tap water path | route 28 grade | etc., Is abbreviate | omitted, and many components actually required may be attached. In order to check whether or not only the hot water filling operation is performed, in this embodiment, it is determined whether or not at least one of the hot water taps 48 is opened. If all of the hot-water taps 48 are closed, it is determined that the flow rate of the mixed hot water path 34b is equal to the flow rate of the hot water filling path 50, and only the hot water filling operation is being performed. Instead, it may be determined whether or not only the hot water filling operation is performed by directly comparing the flow rate of the mixed hot water passage 34b and the flow rate of the hot water passage 50.
In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Hot water supply system 4: Compressor 6: First heat exchanger 8: Heat medium path 10: Pressure reducing valve 12: Fan 14: Second heat exchanger 16: Low-speed heater 18: Circulation pump 20: Circulation path 22: Hot water storage Tank 24: Water pipe connection port 26: Tap water thermistor 28: Tap water path 28a: Pre-branch tap water path 28b: Post-branch tap water path 28c: Mixing tap water path 30: Hot water tank lower thermistor 32: Hot water tank upper thermistor 34: Hot water path 34a: Hot water hot water path 34b: Mixed hot water path 36: Mixing ratio regulator 38: Mixed hot water thermistor 40: Rapid heater 42: Third heat exchanger 44: Burner 46: Hot water hot water thermistor 48: Hot water tap 50 : Hot water filling path 52: On-off valve 54: Bath circulation path 56: Bath circulation pump 58: Fourth heat exchanger 64: Bathtub 66: Controller 68: Atmospheric temperature thermistor

Claims (6)

A low-speed heater that heats water using the amount of heat of the atmosphere,
A hot water storage tank for storing hot water heated by a low-speed heater,
A hot water path for discharging hot water from a hot water tank,
Tap water path for mixing into the hot water path,
A mixing ratio adjuster that adjusts the ratio of the amount of hot water flowing through the hot water path to the amount of cold water flowing through the tap water path for mixing;
A mixed hot water path for guiding the mixed hot water that has passed through the mixing ratio adjuster to the hot water tap;
A rapid heater that heats the water flowing through the hot water path or mixed hot water path;
A hot water path that branches off from the mixed hot water path and leads the mixed hot water to the bathtub,
An on-off valve for opening and closing the hot water filling path,
Stores the temperature of the mixed warm water supplied to the bathtub (filling temperature), and includes a controller for controlling the mixing ratio adjuster and the on-off valve,
The controller is
1) a process for monitoring the occurrence of an event in which the temperature of the hot water discharged from the hot water tank to the hot water path is lower than the set temperature of the hot water;
2) A process for determining whether or not the entire amount of hot water discharged from the hot water storage tank is flowing through the hot water filling path when the event 1) occurs.
3) A hot water supply system that performs the process of closing the on-off valve when the total amount is 2) and starting the operation of the rapid heater when the total amount is not. The controller is provided with a switch that allows the user to switch between efficiency priority and time priority,
When the event of 1) occurs while the time priority is selected by the switch, a process of starting the operation of the rapid heater is performed instead of the processes of 2) and 3). The hot water supply system according to claim 1. The controller is provided with a hot water filling reservation switch and a hot water filling immediate start switch,
The process of starting the operation of the rapid heater is performed instead of the processes of 2) and 3) when the switch for immediate start is operated and the event of 1) occurs. Hot water system. A process in which the controller calculates the time required to obtain the amount of heat of hot water that needs to be supplied to the bathtub after that in the event of the above 1) by the low-speed heater;
If the time is equal to or longer than a predetermined time, when the event of 1) occurs, the process of starting the operation of the rapid heater is performed instead of the processes of 2) and 3). Item 1. A hot water supply system according to item 1.   The hot water supply system according to claim 4, wherein the controller includes an operating device for a user to set the predetermined time. The controller is
4) A process of opening the on-off valve after the elapse of time necessary to obtain the amount of heat of the hot water that needs to be supplied to the bathtub after the on-off valve is closed in 3) is performed. The hot water supply system according to any one of claims 1 to 5.

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