JP4034254B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that uses hot water stored in a hot water storage tank to replenish hot water in a bathtub.

Conventionally, in this type of electric water heater and heat pump hot water storage type hot water supply device, it is possible to recharge hot water in the bathtub using the hot water stored in the hot water storage tank, and if there is a reheating instruction, the temperature of the hot water stored in the hot water storage tank If this temperature is equal to or higher than the predetermined temperature T1, the bath circulating pump is driven to circulate the bath water to the heat exchanger and perform a reheating operation by exchanging heat with the hot water in the hot water storage tank. When the temperature of the hot water storage tank dropped to a temperature that was insufficient for reheating during operation, the reheating operation was stopped.
JP 2003-50048 A

  However, in this conventional system, even when the remaining hot water of the bath is low in temperature and in a large amount, the hot water storage operation is performed if the hot water storage temperature is equal to or higher than the predetermined temperature T1, and therefore the hot water storage tank of the hot water storage tank is in the middle of the hot water operation. Even if the amount of heat drops to an amount that is insufficient for reheating, if the hot water storage temperature is equal to or higher than the predetermined temperature T1, it will continue the reheating operation and it will take a long time to raise the bath water to the temperature desired by the user. However, the chasing operation continued forever, and the convenience of the user might be impaired.

  Therefore, in order to prevent the chasing operation from continuing indefinitely, the predetermined temperature T1 under which the chasing operation can be started is set to a high temperature, or the hot water storage is started after the chasing operation is started. It is conceivable to stop the chasing operation when the temperature falls below the predetermined temperature T2 higher than the predetermined temperature T1. However, if this is done, the amount of heat required for the reheating operation varies depending on the bath temperature and the amount of hot water remaining in the bath, so if the amount of heat required for the reheating operation is small, the reheating operation is actually performed. In spite of the fact that it can be performed, there is a case where the driving operation is not performed or is canceled, which greatly impairs the convenience of the user.

Accordingly, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a hot water storage temperature sensor for detecting the hot water storage temperature of the hot water storage tank, and a bath circulation pump for circulating hot water in the bathtub. A bath circulation circuit, a heat exchanger provided in the middle of the bath circulation circuit for heating bath water with hot water stored in the hot water storage tank, and a bath return provided on the upstream side of the heat exchanger of the bath circulation circuit A temperature sensor and a bath temperature sensor provided on the downstream side of the heat exchanger of the bath circulation circuit, driving the bath circulation pump to circulate bathtub water to the heat exchanger and reheating operation In the hot water storage type hot water supply apparatus configured as described above, during the reheating operation, the amount of heat Q1 required for reheating calculated based on the bath temperature detected by the bath return temperature sensor, and the hot water storage temperature sensor. After so as to determine whether to perform the firing operation chase on the basis of the hot water storage amount of heat Q2 that can be used for reheating is calculated based on the hot-water storage temperature detected, Reheating operation is started in service, the bath forward If the difference between the temperature detected by the temperature sensor and the temperature detected by the return temperature sensor is less than a predetermined value, the reheating operation is stopped .

  Further, in claim 2, the amount of heat Q1 required for reheating is calculated based on the bath temperature detected by the bath return temperature sensor and the amount of bath water stored in advance. I made it.

  Moreover, in Claim 3, in the thing of the said Claim 1, the water level sensor which detects the water level of a bathtub is provided in the said bath circuit, and the calorie | heat amount Q1 required for the reheating is the bath temperature which the said return temperature sensor detects And the water level detected by the water level sensor.

  Moreover, in Claim 4, in the thing of the said Claims 1-3, the hot water storage quantity Q2 which can be used for the reheating is the hot water storage temperature detected by the hot water storage temperature sensor, and the bath temperature detected by the bath return temperature sensor. It was made to calculate based on.

  Further, in claim 5, the amount of stored hot water Q2 that can be used for reheating is calculated based on the hot water storage temperature detected by the hot water storage temperature sensor and the reheating target temperature. I did it.

  Moreover, in Claim 6, in the thing of the said Claims 1-3, the hot water storage quantity Q2 which can be used for the reheating is the hot water storage temperature detected by the hot water storage temperature sensor, and the bath temperature detected by the bath return temperature sensor. It was calculated based on the reheating target temperature.

According to claim 1 of the present invention, the amount of heat Q1 required for reheating and the amount of stored hot water Q2 that can be used for reheating are calculated, and these are compared to determine whether or not to perform reheating operation. Therefore, there is no inconvenience such as running out of hot water during the refueling operation, or actually not being able to carry out the renewal operation even though the reheating operation is possible, and more accurately determine whether or not the retreat operation is possible. Furthermore, after the reheating operation is started, if the bath water is not efficiently heated, the renewal operation is stopped, so that the convenience of the user can be greatly improved. it can.

  According to claim 2, the amount of heat Q1 required for reheating is calculated based on the actual bath temperature and the amount of hot water stored in advance, so that the amount of heat Q1 required for reheating is calculated with higher accuracy. This makes it possible to more accurately determine whether or not the chasing operation is possible.

  According to claim 3, the amount of heat Q1 required for reheating is calculated based on the actual bath temperature and the bathing water level detected by the water level sensor. It is possible to calculate, and it is possible to more accurately determine whether or not the chasing operation is possible.

  According to claim 4, the hot water storage amount Q2 that can be used for reheating is calculated based on the hot water storage temperature of the hot water storage tank and the actual bath temperature, so that the hot water storage amount Q2 that can be used for reheating is more accurately calculated. It is possible to calculate, and it is possible to more accurately determine whether or not the chasing operation is possible.

  According to the fifth aspect, since the hot water storage amount Q2 that can be used for reheating is calculated based on the hot water storage temperature of the hot water storage tank and the reheating target temperature, the hot water storage amount Q2 that can be used for reheating is more accurately determined. It is possible to calculate, and it is possible to more accurately determine whether or not the chasing operation is possible.

  According to the sixth aspect of the present invention, the hot water storage amount Q2 that can be used for reheating is calculated based on the hot water storage temperature of the hot water storage tank, the actual bath temperature, and the reheating target temperature. The amount of heat Q2 can be calculated with higher accuracy, and it is possible to more accurately determine whether or not the chasing operation is possible.

  The present invention relates to a hot water storage tank 2 for storing hot water, a hot water storage temperature sensor 33 for detecting the hot water storage temperature of the hot water storage tank 2, a bath circulation circuit 22 provided with a bath circulation pump 20 and circulating hot water in a bathtub 6, and the bath. A heat exchanger 18 provided in the middle of the circulation circuit 22 for heating the bath water with warm water stored in the hot water storage tank 2, and a bath return temperature sensor provided on the upstream side of the heat exchanger 18 of the bath circulation circuit 22. 23, and the bath circulating pump 20 is driven to circulate the bath water to the heat exchanger 18 so as to perform a reheating operation. In the reheating operation, the bath return temperature sensor The heat amount Q1 required for reheating calculated based on the bath temperature detected by the hot water 23 and the reheating calculated based on the hot water storage temperature detected by the hot water storage temperature sensor 33 can be used. Since it is determined whether or not the reheating operation is performed on the basis of the hot water storage heat amount Q2, the reheating operation is continued indefinitely due to insufficient heat storage during the reheating operation. However, there is no inconvenience such as not performing a chasing driving, but it is possible to more accurately determine whether or not a chasing driving is possible, which can greatly improve user convenience. .

  Here, the amount of heat Q1 required for reheating may be calculated based on at least the bath temperature, and the amount of stored hot water Q2 that can be used for reheating is calculated based on at least the stored hot water temperature. It is good.

  Next, Embodiment 1 of the present invention will be described. This hot water storage type hot water supply apparatus boils hot water in the midnight hours when the unit price of contracted electric power according to time zone is low, stores the hot water, and uses the stored hot water for hot water supply. 1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump unit as a heating means for heating hot water in the hot water storage tank, and 4 is a hot water tap provided in a kitchen or a washroom. Reference numeral 5 denotes a remote controller for remotely operating the hot water storage type hot water supply apparatus, and 6 denotes a bathtub.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 7 connected to the upper end, a water supply pipe 8 connected to the lower end, a heat pump forward pipe 9 constituting a heat pump circulation circuit in the lower part, and a heat pump circulation circuit in the upper part. The heat pump return pipe 10 is connected, the hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 9 is boiled by the heat pump unit 3 and returned to the hot water storage tank 2 from the heat pump return pipe 10 to be stored in the hot water supply pipe. The hot water in the hot water storage tank 2 is pushed up by the water supply from 8, and the hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 7 to supply hot water.

  The heat pump unit 3 includes a compressor 11, a refrigerant-water heat exchanger 12 as a condenser, an electronic expansion valve 13, a forced air-cooled evaporator 14, and hot water in the hot water storage tank 2. A heat pump circulation pump 16 that circulates to the refrigerant-water heat exchanger 12 through the heat pump forward pipe 9 and the heat pump return pipe 10 and a heat pump control unit 17 that controls driving thereof are provided in the heat pump circuit 15. Is one in which carbon dioxide is used as a refrigerant to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, low-temperature water can be boiled up to a high temperature of about 90 ° C. without an electric heater.

  Here, the refrigerant-water heat exchanger 12 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water are opposed to each other. In the supercritical heat pump cycle, the refrigerant is exchanged during heat exchange. Since it is condensed in the supercritical state, the heated water can be efficiently heated to a high temperature so that the temperature difference between the refrigerant-water heat exchanger 12 inlet temperature and the refrigerant outlet temperature is constant. Further, by controlling the electronic expansion valve 12 or the compressor 11, the water to be heated can be heated in a state where the COP (energy consumption efficiency) is very good.

  Next, 18 is a heat exchanger made of a stainless steel serpentine tube for heating the hot water in the bathtub 6, and is arranged at the upper part in the hot water storage tank 2. A bath circulation circuit 22 comprising a bath return pipe 21 provided with a bath circulation pump 20 is connected so that hot water in the bathtub 6 can be circulated, and the hot water in the bathtub 6 is heated by the high-temperature water in the hot water storage tank 2 for heat insulation. Or it is something that is chased.

  23 is a bath return temperature sensor that detects the temperature of the bath water flowing into the heat exchanger 18 through the bath return pipe 21, and 24 is a bath that flows out of the heat exchanger 18 and flows into the bath 6 through the bath pipe 19. A temperature sensor that detects the temperature of water. Reference numeral 25 denotes a water level sensor provided in the bath return pipe 21 for detecting the bath water level above the bath circulation port 26.

  Next, 27 is a hot water mixing valve composed of an electric mixing valve for mixing hot water from the hot water discharge pipe 7 and low temperature water from the water supply bypass pipe 28 branched from the water supply pipe 9. The mixing ratio is controlled so that the hot water temperature detected by the provided hot water temperature sensor 30 becomes the hot water supply set temperature set by the user using the remote controller 5.

  Reference numeral 31 denotes a hot water filling pipe branched from the hot water supply pipe 29 and communicated with the bath return pipe 21. The hot water filling pipe 31 includes a hot water filling valve 32 for starting / stopping hot water filling to the bathtub 6, and a bathtub 6. A bath flow counter 33 that counts the amount of hot water filled in the water and a check valve 34 that prevents the bath water from flowing back to the hot water supply pipe 29 are provided.

  Next, a plurality of hot water storage temperature sensors 35 are arranged in the vertical direction of the hot water storage tank 2. In this embodiment, five hot water storage temperature sensors are arranged and are called 35a, 35b, 35c, 35d, 35e from the top. The amount of heat remaining in the hot water storage tank 2 is detected based on the temperature information detected by the temperature sensor 35, and the temperature distribution in the vertical direction in the hot water storage tank 2 is detected.

  The remote controller 5 is provided with a hot water supply temperature setting switch 36 for setting the hot water supply set temperature and a bath temperature setting switch 37 for setting the bath set temperature, and hot water at the bath set temperature is supplied to the bathtub 6 of the remote control 5. An automatic bath switch 38 that fills the hot water by a hot water amount set by a hot water amount setting switch (not shown) and keeps it warm for a predetermined time, and a reheating switch 39 that replenishes the bath water are provided.

  A hot water supply control unit 40 includes a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls the driving of each actuator, and constitutes a control unit. The remote controller 5 is connected to the hot water supply control unit 40 by radio or wire so that the user can set an arbitrary hot water set temperature and bath set temperature.

  Note that 41 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 42 is a pressure reducing valve for reducing the pressure of the water supply, 43 is a hot water supply flow rate counter for counting the amount of hot water to be supplied, and 44 is for detecting the temperature of the water supply. It is a feed water temperature sensor.

Next, the operation of the first embodiment will be described.
First, when the hot water storage temperature sensor 35 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the midnight power time zone, the hot water supply control unit 40 issues a boiling start command to the heat pump control unit 17. To emit. Upon receiving the command, the heat pump control unit 17 starts driving the heat pump after starting the compressor 11, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 9 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C by the water heat exchanger 12, returned to the hot water tank 2 from the heat pump return pipe 10 connected to the upper part of the hot water tank 2, and stacked in order from the upper part of the hot water tank 2 Store hot water. When the hot water storage temperature sensor 35 detects that the necessary amount of heat has been stored, the hot water supply control unit 40 issues a boiling stop command to the heat pump control unit 17, and the heat pump control unit 17 stops the compressor 11 and heat pump circulation. The pump 16 is also stopped to end the boiling operation.

  Next, the hot water supply operation will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 8 flows into the hot water storage tank 2. The hot water stored in the hot water storage tank 2 flows into the hot water supply mixing valve 27 through the hot water discharge pipe 7 and is mixed with the low temperature water from the hot water supply bypass pipe 28, and the hot water supply control unit 40 sets the mixing ratio of the hot water supply mixing valve 27. The adjusted hot water at the hot water supply set temperature is supplied from the hot water tap 4. Then, the hot water supply is completed by closing the hot water tap 4.

  Next, the hot water filling operation to the bathtub 6 will be described. When the automatic bath switch 38 of the remote controller 5 is operated, the hot water supply control unit 40 opens the hot water filling valve 32. Then, the hot water adjusted to the set temperature by the hot water supply mixing valve 27 is poured from the hot water filling pipe 31 to the bathtub 6 through the hot water return pipe 21, and a bath flow rate counter 33 provided in the middle of the hot water filling pipe 31 is predetermined. When the hot water filling amount V1 is counted, the hot water supply control unit 40 closes the hot water filling valve 32 and ends the hot water filling operation.

  Here, in this hot water filling operation, the hot water amount until the water level sensor 25 detects a change after the hot water supply control unit 40 starts the hot water filling is accumulated in the bath flow counter 33, and this is added from the bottom of the bathtub 6. The hot water amount V2 at the circulation port 26 is stored, and the hot water amount V3 per unit water level of the bathtub 6 is calculated and stored based on the subsequent hot water amount and the water level change.

  Next, the bathing operation will be described based on the flowchart shown in FIG. When the reheating switch 39 of the remote controller 5 is turned on and there is an instruction to start the reheating operation, the hot water supply control unit 40 checks the hot water storage temperature detected by the hot water storage temperature sensor 35 attached to the hot water storage tank 2, and the heat exchanger It is determined whether the hot water storage temperature in the vicinity of 18 is equal to or higher than a predetermined temperature T1 (here, 50 ° C.) considered to be the minimum necessary for heat exchange (step 1, hereinafter abbreviated as S1).

  When the hot water storage temperature in the vicinity of the heat exchanger 18 is equal to or higher than the predetermined temperature T1 (Yes in S1), the hot water supply control unit 40 starts driving the bath circulation pump 20 (S2) and is stored in the upper part of the hot water storage tank 2. Heat exchange between high-temperature water and bathtub water starts bathing operation.

  At this time, the bath temperature is detected by the bath return temperature sensor 23, and the actual bath temperature at the start of the reheating detected, the reheating target temperature based on the bath setting temperature, and the predetermined input and stored. The amount of heat Q1 required for reheating is calculated from the amount of hot water filled V1 (S3).

  When the bath temperature is lower than the bath set temperature set by the bath temperature setting switch 37, the bath target temperature is set as the bath target temperature, and when the bath temperature is equal to or higher than the bath set temperature. A temperature that is higher than the set temperature by a predetermined temperature (for example, 2 ° C.) is set as the target temperature.

  In addition, a predetermined hot water filling amount V1 set by the user is used to calculate the amount of heat Q1 required for reheating. The predetermined hot water filling amount V1 is directly input by the user operating the remote controller 5. It is not limited to the amount of hot water filling, and may be a value that is sufficient to calculate the amount of heat Q1 required for reheating and that does not exceed the capacity of the bathtub 6. In other cases, the user designates a set water level, and if the user specifies the set water level, the amount of hot water up to the set water level when the hot water is filled is set to the flow rate counter 33. The value counted in step (1) may be stored and used as the predetermined hot water filling amount V1. By using the hot water filling amount V1 stored in advance as described above, it is possible to shorten the time required to calculate the heat amount Q1 required for reheating.

  Then, a hot water storage heat quantity Q2 that can be used for reheating is calculated from the hot water storage temperature in the vicinity of the heat exchanger 18 detected by the hot water storage temperature sensor 35 and a predetermined capacity in the vicinity of the heat exchanger 18 in which the temperature is detected (S4).

  When calculating the amount of stored hot water Q2 that can be used for reheating, a value obtained by subtracting the bath temperature detected by the bath return temperature sensor 23 from the detected hot water temperature, or the target temperature for subtraction is subtracted from the detected hot water temperature. By using a value or a value obtained by subtracting the average value of the bath temperature and the target temperature for reheating from the detected hot water temperature, the amount of stored hot water Q2 that can be used for reheating can be calculated more accurately.

  Here, the hot water storage amount Q2 is calculated in the hot water storage tank 2 by using the value obtained by subtracting the reheating target temperature from the hot water storage temperature to replenish the entire amount of the bath water. It is possible to judge whether or not.

  Then, the amount of heat Q1 required for reheating calculated in the steps of S3 and S4 is compared with the amount of heat Q2 that can be used for reheating, and the amount of stored hot water Q2 that can be used for reheating is sufficient for the amount of heat Q1 required for reheating. If Q2 / Q1 is greater than or equal to a predetermined value (1.2 in this case), it is determined that the reheating operation can be performed with the amount of heat in the hot water storage tank 2. Then, continue the chasing operation.

  Here, in the heat exchange between the hot water in the hot water storage tank 2 and the hot water in the bathtub, the amount of heat given to the bathtub water is limited by the capacity of the hot water tank 2 and the hot water temperature, and the hot water is stored as the reheating operation proceeds. The temperature difference between the water and the bathtub water becomes smaller. For this reason, when the difference between the amount of heat Q1 required for reheating and the amount of stored hot water Q2 that can be used for reheating is small, the heat exchange efficiency deteriorates and it takes time for reheating. It is determined that it is possible to perform a reheating operation when there is a sufficient amount of hot water storage heat amount Q2 that can be used for reheating with respect to the heat amount Q1, so that the problem of continuing reheating is solved. Is.

  If the difference between the temperature detected by the bath temperature sensor 24 and the temperature detected by the bath return temperature sensor 23 is equal to or greater than a predetermined value, it is determined that the bath water is efficiently heated (Yes in S6). ), And the chasing operation is continued until the temperature of the bath water reaches the target chasing temperature (S7).

  Finally, when the bath temperature detected by the bath return temperature sensor 23 reaches the bath setting temperature (Yes in S7), the hot water supply control unit 38 stops driving the bath circulating pump 20 (S8) and ends the reheating operation. (S9).

  In addition, after starting the reheating operation, there is only a little room for the amount of stored hot water Q2 that can be used for reheating with respect to the heat amount Q1 required for reheating, and specifically, Q2 / Q1 is a predetermined value (here, 1). .2) If it is less (No in S5), it is determined that it is impossible to perform the reheating operation with the amount of heat in the hot water storage tank 2, and the circulation pump 20 is stopped to stop the reheating operation (S10). ). At this time, it is preferable to notify the remote controller 5 that the chasing operation has been stopped by voice or text.

  Further, when the reheating operation switch 37 is turned on, it is detected that the hot water storage temperature sensor 35 is lower than a predetermined temperature T1 (here, 50 ° C.) considered to be the minimum necessary for the heat exchange capacity (No in S1). , The process proceeds to step S10 so as not to perform the chasing operation.

  Moreover, after the reheating operation is started, when it is detected that the difference between the temperature detected by the forward temperature sensor 24 and the temperature detected by the back return temperature sensor 23 is less than a predetermined value, the bath water is efficiently heated. (No in S6), the process proceeds to step S10, and the circulating pump 20 is stopped and the reheating operation is stopped.

  In this way, the amount of heat Q1 required for reheating and the amount of stored hot water Q2 that can be used for reheating are calculated, and based on these, it is determined whether or not reheating operation is performed. With this, there is no inconvenience such as running out of hot water storage, or actually retreating but not retreating, and it is possible to more accurately determine whether or not the reheating operation is possible. Convenience can be greatly improved.

  Note that in the step of calculating the hot water storage amount Q2 that can be used for reheating in S4, the hot water storage heat amount Q2 is calculated using a value obtained by subtracting the reheating target temperature from the hot water storage temperature, thereby pursuing the entire amount of bath water to the end. If it is not possible to make a whispering, the chasing operation can be stopped, and there is no possibility of continuing chasing the driving operation without completion.

  Further, in the step of calculating the amount of stored hot water Q2 that can be used for reheating, the hot water storage temperature in the vicinity of the heat exchanger 18 is detected by the hot water storage temperature sensor 35, and a predetermined capacity in the vicinity of the heat exchanger 18 is added thereto. Although the calorific value is calculated, the predetermined capacity may be a capacity of a hot water storage area having a calorific value that can contribute to replenishment. For example, the hot water storage in the lowermost layer that detects the predetermined temperature T1 or higher It is also possible to calculate and use the capacity from the height of the temperature sensor 35 to the upper end of the heat exchanger 18 in the hot water storage tank 2, and the heat storage heat quantity Q2 that can be used for reheating more accurately in this way. Can be calculated.

  Further, in the step of calculating the amount of heat Q1 necessary for the reheating of S3, the actual bath water level detected by the water level sensor 25, the hot water volume V3 per unit water level stored during the hot water filling operation, and the bath 6 Using the amount of hot water V2 from the bottom surface to the bath circulation port 26, the actual remaining hot water amount in the bathtub 6 at the start of the reheating operation is calculated, and the actual remaining hot water amount, the actual bath temperature, and the reheating target temperature are followed. By calculating the amount of heat Q1 required for firing, it is possible to obtain a more accurate amount of heat Q1, more accurately ascertaining whether or not the reheating operation of the bath is possible, and greatly improving user convenience Can be made.

  In the first embodiment, the start condition of the reheating operation is determined by the temperature detected by the hot water storage temperature sensor 35b close to the heat exchanger 18 as in step S1, but the detection by the hot water storage temperature sensor 35a is detected. The temperature may be taken in or the amount of heat of the entire hot water storage tank 2 may be taken in the judgment, and conversely, this step may be omitted.

  Further, the amount of heat Q1 required for reheating and the amount of stored hot water Q2 that can be used for reheating are calculated, and the timing of determining whether or not to perform reheating operation based on these is heated by the heat exchanger 18. In this case, a bypass circuit 45 that bypasses the heat exchanger 18 and a three-way valve 46 that switches between the heat exchanger 18 side and the bypass circuit 45 side are provided in the bath circuit 20. When a reheating operation start instruction is made by operating the firing switch 39, the bath water is circulated only to the bypass circuit 45 without being circulated to the heat exchanger 18, and the bath temperature, the hot water storage temperature, the bath water level, etc. are circulated in this state. What is necessary is just to make it detect.

  In the first embodiment, the heat exchanger 18 is disposed in the hot water storage tank 2. However, the heat exchanger 18 is not limited to this, and the heat exchanger 18 is disposed outside the hot water storage tank 2 so that the hot water storage water is circulated to the heat exchanger 18. It is a good method. Further, the heat pump type is adopted as means for heating the hot water storage, but the present invention is not limited to this, and an electric heater may be disposed in the hot water storage tank 2.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water storage type hot water supply apparatus of Example 1 of this invention. FIG. 3 is a flowchart for explaining a chasing operation according to the first embodiment. FIG.

Explanation of symbols

2 Hot Water Storage Tank 6 Bath 18 Heat Exchanger 20 Bath Circulation Pump 22 Bath Circulation Circuit 23 Bath Return Temperature Sensor 25 Water Level Sensor 35 Hot Water Storage Temperature Sensor

Claims (6)

A hot water storage tank for storing hot water, a hot water storage temperature sensor for detecting the hot water storage temperature of the hot water storage tank, a bath circulation circuit having a bath circulation pump for circulating hot water in the bathtub, and the bath water provided in the middle of the bath circulation circuit A heat exchanger for heating with hot water stored in a hot water storage tank, a bath return temperature sensor provided on the upstream side of the heat exchanger in the bath circulation circuit, and a downstream side of the heat exchanger in the bath circulation circuit. In the hot water storage type hot water supply apparatus provided with a bath temperature sensor provided and driving the bath circulation pump to circulate the bath water to the heat exchanger for the reheating operation, The amount of heat Q1 required for reheating calculated based on the bath temperature detected by the bath return temperature sensor and the heating calculated based on the hot water storage temperature detected by the hot water temperature sensor. Temperature so as to determine whether to perform the firing operation chase on the basis of the hot water storage amount of heat Q2, after reheating operation is started, detected by the temperature and the bath return temperature sensor for detecting at the bath forward temperature sensor capable The hot water storage type hot water supply apparatus is characterized in that the chasing operation is stopped when the difference between the two is less than a predetermined value .   The hot water storage type hot water supply apparatus according to claim 1, wherein the amount of heat Q1 required for reheating is calculated based on a bath temperature detected by the bath return temperature sensor and a stored hot water amount.   A water level sensor for detecting the water level of the bathtub is provided in the bath circulation circuit, and the amount of heat Q1 required for reheating is calculated based on the bath temperature detected by the bath return temperature sensor and the bath water level detected by the water level sensor. The hot water storage type hot water supply apparatus according to claim 1, wherein   The amount of stored hot water Q2 that can be used for reheating is calculated on the basis of a hot water storage temperature detected by the hot water storage temperature sensor and a bath temperature detected by the bath return temperature sensor. Hot water storage system.   The hot water storage type hot water supply apparatus according to claim 1, wherein the hot water storage heat quantity Q2 that can be used for reheating is calculated based on a hot water storage temperature detected by the hot water storage temperature sensor and a reheating target temperature.   The amount of stored hot water Q2 that can be used for reheating is calculated based on the hot water storage temperature detected by the hot water storage temperature sensor, the bath temperature detected by the bath return temperature sensor, and the reheating target temperature. The hot water storage type hot water supply apparatus according to claim 1.

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