JP2018162910A - Hot water storage and hot water supply heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage and hot water supply heating apparatus capable of properly utilizing heating capability of an auxiliary heat source machine when utilizing hot water heated by the auxiliary heat source machine simultaneously for heating and hot water supply.SOLUTION: A hot water storage and hot water supply heating apparatus comprises: a hot water storage tank 2 in which hot water heated by heating means is stored; an auxiliary heat source machine 3 provided at a hot water supply passage; a hot water circulation circuit 14 which branched off from the hot water supply passage downstream from the auxiliary heat source machine and which is connected to the hot water supply passage upstream from the auxiliary heat source; a heat exchanger 15 provided at the hot water circulation circuit; and a three-way valve 5 provided at a connection part between the hot water supply passage and the hot water circulation circuit. The hot water storage and hot water supply heating apparatus simultaneously performs: a hot water supply operation in which hot water in the hot water storage tank and hot water of the hot water circulation circuit are mixed together and then the hot water heated by the auxiliary heat source machine from the hot water supply passage is supplied; and a circulation operation in which the hot water heated by the auxiliary heat source machine at the heat exchanger is utilized, a mixing rate of the three-way valve being a mixing rate of a necessary hot water supply rate needed for the hot water supply operation and a calculated necessary circulation flow rate needed for the circulation operation.SELECTED DRAWING: Figure 4

Description

  TECHNICAL FIELD The present invention relates to a hot water storage and hot water heating / heating device provided with a hot water storage tank for storing hot water and an auxiliary heat source device, and in particular, hot water storage / hot water heating / heating that uses an auxiliary heat source device to perform either or both heating and bath replenishment simultaneously. Relates to the device.

  2. Description of the Related Art Conventionally, hot water storage and hot water supply / heating devices having functions of hot water supply, heating, and bathing are known. For example, in the hot water storage hot water system of Patent Document 1, hot water stored in a hot water storage tank can be used for hot water supply, heating or bathing, that is, when the heat storage state is sufficient, Use for heating or bathing. On the other hand, when the heat storage state is insufficient, hot water is heated by an auxiliary heat source device to supply hot water, and heating or bath reheating is performed with hot water heated by an auxiliary heat source device or an external heat source device.

  Such a hot water storage hot water supply apparatus includes a hot water storage tank for storing hot water heated by an external heat source device, a hot water passage connected from the upper portion of the hot water storage tank to a hot water tap etc. via an auxiliary heat source device, and an auxiliary for this hot water supply passage. A hot water circulation circuit is provided that branches downstream from the heat source machine and is connected to the upstream side of the auxiliary heat source machine, and a three-way valve is disposed at a connection portion between the hot water passage and the hot water circulation circuit. The three-way valve has a state in which the hot water storage tank and the auxiliary heat source unit are in communication (closed state on the hot water circulation circuit), a state in which the hot water circulation circuit and the auxiliary heat source unit are in communication (closed state on the hot water tank side), a hot water tank and a hot water circulation circuit And a switching means that can be switched to a state in which the auxiliary heat source unit communicates (mixed state). The hot water circulation circuit is provided with a heat exchanger for heating and a heat exchanger for bathing.

Japanese Patent No. 5311128

  In the hot water storage hot water supply system of Patent Document 1, when the hot water storage state of the hot water tank becomes insufficient during hot water supply, the three-way valve is switched to the closed state on the hot water circulation circuit side, and the hot water storage state of the hot water tank is sufficient during heating or bathing. If not, the three-way valve is switched to the hot water storage tank side closed state, and the auxiliary heat source machine is operated to continue hot water supply, heating or bath reheating. Thereby, the fall of hot water supply temperature, heating temperature, and bath temperature is prevented.

  For example, when heating and hot water supply are performed simultaneously, it is conceivable to use hot water heated by an auxiliary heat source machine. At this time, since the hot water supply flow rate is not always constant, the three-way valve is switched to a preset mixed state so that the maximum hot water supply flow rate can be supplied. Hot water from the hot water storage tank and hot water from the hot water circulation circuit are mixed in the three-way valve and supplied to the auxiliary heat source machine, and hot water heated by the auxiliary heat source machine is used for hot water supply and heating. Since the three-way valve is in a mixed state with a preset constant ratio, the heating capacity of the auxiliary heat source machine is distributed to hot water supply and heating, so that the heating capacity at this time is lower than the single heating capacity.

  When the hot water supply flow rate is small, there is a margin in the heating capacity of the hot water supply. In order to increase the flow rate of the hot water circulation circuit using this heating capacity to compensate for the decrease in the heating capacity, it is necessary to drive the circulation pump at a higher speed. However, an upper limit is set for the rotation speed of the circulation pump, and driving in the vicinity of the upper limit of the rotation speed is not preferable because the burden on the circulation pump is large. Further, even if the circulation pump is driven in the vicinity of the upper limit, it is difficult to increase the flow rate of the hot water circulation circuit because the three-way valve becomes a water flow resistance. The same problem occurs when performing hot water supply and bathing at the same time.

  An object of the present invention is to provide a hot water storage hot water heater that can appropriately use the heating capacity of an auxiliary heat source machine when hot water heated by an auxiliary heat source machine is used for heating or bathing and hot water supply at the same time. is there.

  The invention of claim 1 includes a hot water storage tank for storing hot water heated by a heating means, a water supply passage connected to a lower portion of the hot water storage tank, a hot water passage connected to an upper portion of the hot water storage tank, and the hot water passage. An auxiliary heat source device provided in the hot water circulation circuit, and a hot water circulation circuit that is branched from the hot water supply passage downstream of the auxiliary heat source device and connected to the hot water discharge passage upstream of the auxiliary heat source device; A heat exchanger, a three-way valve provided at a connection portion between the hot water passage and the hot water circulation circuit, and a circulation means provided in the hot water passage between the auxiliary heat source unit and the three-way valve, A hot water supply operation in which the circulating means is driven to mix hot water from the hot water storage tank and hot water from the hot water circulation circuit by the three-way valve, and hot water heated by the auxiliary heat source machine is discharged from the hot water passage, and the auxiliary heat source By machine In the hot water storage hot water supply / heating device that performs simultaneous operation of circulating operation using heated hot water in the heat exchanger, the mixing ratio of the three-way valve is determined by the required flow rate for hot water supply and the circulation required for the circulation operation. The required flow rate is calculated, and the mixing ratio according to these ratios is used.

  With the above configuration, during simultaneous operation, the mixing ratio of the three-way valve is adjusted based on the calculated required flow rate of hot water supply and the required flow rate of circulation, so that hot water can be heated by appropriately using the heating capacity of the auxiliary heat source unit. .

  The invention of claim 2 is characterized in that, in the invention of claim 1, the mixing ratio of the three-way valve is corrected and adjusted in accordance with the driving state of the circulating means.

  With the above-described configuration, it is possible to prevent the driving state of the circulation means from being driven in a region near the upper limit of the driving capability, and it is possible to heat hot water by appropriately utilizing the heating capability of the auxiliary heat source device.

  According to a third aspect of the present invention, in the second aspect of the present invention, when the number of rotations of the circulating means is equal to or higher than a set number of rotations and the required flow rate for circulation is equal to or higher than the required flow rate for hot water supply, the flow rate on the hot water circulation circuit side is increased. Thus, the mixing ratio of the three-way valve is corrected and adjusted.

  The above configuration corrects and adjusts the mixing ratio of the three-way valve so as to increase the flow rate on the side of the hot water circulation circuit that requires more hot water, so that the water flow resistance of the three-way valve is lowered and the circulating means is in a driving state. The number of revolutions can be reduced and the flow rate on the hot water circulation circuit side can be increased, and hot water can be heated by appropriately utilizing the heating capability of the auxiliary heat source machine.

  The invention of claim 4 is characterized in that, in the invention of claim 1 or 2, the mixing ratio of the three-way valve is corrected and adjusted in accordance with the outlet temperature of the auxiliary heat source unit and the hot water temperature of the hot water passage.

  With the above configuration, it is possible to suppress a decrease in the temperature of the hot water.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, when the temperature difference between the outlet temperature of the auxiliary heat source unit and the outlet temperature of the outlet passage is larger than a set temperature, the flow rate on the side of the hot water circulation circuit is reduced. Further, the mixing ratio of the three-way valve is corrected and adjusted.

  With the above configuration, when the hot water supply flow rate is small, the hot water in the hot water storage tank is prevented from being mixed and supplied to the hot water supply passage without being heated, and a decrease in the hot water temperature can be suppressed.

  According to the hot water storage hot water supply / heating device of the present invention, during the simultaneous operation of the hot water supply operation using the hot water heated by the auxiliary heat source device and the circulation operation, the mixing ratio of the three-way valve is adjusted to appropriately adjust the heating capacity of the auxiliary heat source device. Can be used.

It is a schematic block diagram of the hot water storage hot-water supply heating apparatus which concerns on an Example. It is a figure which shows one example of the hot water circulation operation which circulates the hot water heated with the auxiliary heat source machine. It is a figure which shows the hot water supply operation which heats the hot water of a hot water storage tank with an auxiliary heat source machine, and supplies hot water. It is a figure which shows one example of the simultaneous driving | operation which supplies hot water while circulating the hot water heated with the auxiliary heat source machine. It is a flowchart which shows the three-way valve variable control of the simultaneous operation which concerns on an Example.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

Initially, the whole structure of the hot water storage hot-water supply heating apparatus 1 is demonstrated.
As shown in FIG. 1, a hot water storage hot water supply / heating device 1 includes a hot water storage tank 2, an auxiliary heat source device 3, etc., and is heated by an external heat source device (for example, a heat pump heat source device) that is a heating means (not shown). Hot water stored in the hot water is supplied, or hot water heated by the auxiliary heat source device 3 is used for hot water supply, heating, and bathing. The auxiliary heat source unit 3 heats the hot water using the combustion heat of the fuel gas.

  The hot water supply passage 4 for discharging hot water from the hot water storage tank 2 includes an upper outlet hot water passage portion 4a connected to the three-way valve 5 from the upper portion of the hot water storage tank 2, and an intermediate hot water supply passage portion connected to the auxiliary heat source unit 3 from the three-way valve 5. 4b and the lower effluent hot water passage part 4c connected to the mixing valve 6 from the auxiliary heat source unit 3 is comprised. The upper outlet hot water passage portion 4a includes a check valve 4d. The intermediate hot water passage portion 4b includes a circulation pump 7 and a circulating water amount sensor 8 which are circulation means. The lower effluent hot water passage portion 4 c adjusts the amount of hot water supplied to the mixing valve 6, an auxiliary heat source unit outlet temperature sensor 4 e, a mixing valve inlet temperature sensor 4 f that detects the temperature of hot water supplied to the mixing valve 6, and the mixing valve 6. A possible regulating valve 4g is provided.

  A hot water circulation circuit 14 is branched from the upstream side of the regulating valve 4g of the lower effluent hot water passage portion 4c. In addition, when the tank outlet hot water passage 4h branched from the upper outlet hot water passage 4a is connected to the downstream side of the regulating valve 4g of the lower outlet hot water passage 4c and the hot water in the hot water storage tank 2 can be supplied with hot water, Hot water is supplied through the section 4h.

  The water supply passage 9 for supplying clean water to the hot water storage tank 2 has an upstream end connected to the water supply and a downstream end connected to the lower portion of the hot water storage tank 2. The water supply passage 9 is provided with a water supply temperature sensor 9a for detecting the temperature of clean water, a check valve 9b, a pressure reducing valve 9c, and a switching valve 9d. A water supply branch passage 9e branched from the water supply passage 9 in the switching valve 9d is connected to the hot water circulation circuit 14. The switching valve 9d can switch the supply destination of clean water to the hot water storage tank 2 or the hot water circulation circuit 14.

  A water supply bypass passage 10 is branched from the water supply passage 9 and connected to the mixing valve 6. Further, the water supply bypass passage 10 includes a check valve 10a. The mixing valve 6 mixes hot water in the hot water supply passage 4 and clean water in the water supply bypass passage 10 so as to reach a hot water supply set temperature and distributes the mixed water to the hot water supply passage 11. The hot water supply passage 11 includes a hot water supply amount sensor 11a, a hot water supply temperature sensor 11b, and a water amount adjustment valve 11c. Hot water having a hot water supply set temperature flowing through the hot water supply passage 11 is supplied from a hot water tap or the like.

  An upstream heating passage portion 12 a for supplying hot water to an external heat source device is connected to the lower portion of the hot water storage tank 2, and a downstream heating passage portion 12 b through which hot water heated by the external heat source device circulates is formed at the upper portion of the hot water storage tank 2. It is connected and stores hot water heated from the upper part of the hot water storage tank 2. On the outer periphery of the hot water storage tank 2, a plurality of hot water storage temperature sensors 2 a to 2 d for detecting the temperature of the stored hot water are provided at predetermined intervals in the vertical direction.

  The hot water circulation circuit 14 includes an upstream hot water circulation passage portion 14a, a heat exchanger portion 14b, and a downstream hot water circulation passage portion 14c. The upstream hot water circulation passage portion 14a branches from the lower effluent hot water passage portion 4c and is connected to the downstream hot water circulation passage portion 14c via the heat exchanger portion 14b. A downstream end of the downstream hot water circulation passage portion 14c is connected to the hot water discharge passage 4 via the three-way valve 5, and a water supply branch passage portion 9e is connected to an intermediate portion of the downstream hot water circulation passage portion 14c. The three-way valve 5 can adjust the mixing ratio of hot water in the hot water storage tank 2 flowing through the upper effluent hot water passage portion 4a and hot water flowing in the hot water circulation circuit.

  In the heat exchanger section 14b, a heating heat exchanger 15 and a bath heat exchanger 16 are arranged in parallel, and electromagnetic valves 15a and 16a are provided on the downstream side, respectively. The downstream hot water circulation passage 14c is provided with a return temperature sensor 14d. For example, during heating, as shown in FIG. 2, the three-way valve 5 is adjusted to the hot water tank side closed state and the circulation pump 7 is driven to heat the auxiliary heat source unit 3 and the heating heat exchanger 15 by the auxiliary heat source unit 3. A circulating operation in which the hot and cold water is circulated can be performed.

  The hot water storage hot water heater 1 controls the auxiliary heat source unit 3 and the like based on a command from an operation remote controller (not shown) operable by the user and a detection signal from a temperature sensor or the like disposed in the hot water storage hot water heater 1. A control unit 20 is provided. In the hot water supply operation in which hot water in the hot water storage tank 2 is heated by the auxiliary heat source unit 3 to supply hot water, the hot water in the hot water storage tank 2 is mixed with the hot water outlet passage portion 4h from the tank hot water outlet passage portion 4h without being heated. 3, the three-way valve 5 is closed on the hot water circulation circuit side as shown in FIG. 3 and the circulation pump 7 is driven to heat the hot water in the hot water storage tank 2 by the auxiliary heat source device 3. The heated hot water is mixed with clean water at the mixing valve 6, and the hot water at the hot water supply set temperature flows through the hot water supply passage 11 and is supplied to a hot water tap or the like. The hot water storage tank 2 is supplied with the same amount of hot water as the hot water supplied to the auxiliary heat source unit 3 from the water supply passage 9.

Next, the heating operation will be described.
The heating operation is performed using the heat of hot water flowing through the hot water circulation circuit 14 by the circulation operation shown in FIG. When the heating operation is started, the control unit 20 drives the circulation pump 7 to open the electromagnetic valve 15a so that the hot water flows through the heating heat exchanger 15 of the hot water circulation circuit 14. In the heating circuit 17, the heating pump 17a is driven to circulate the heating heat medium between the heating heat exchanger 15 and a heating terminal (not shown).

  The controller 20 circulates based on the temperature of the circulating hot water and the temperature of the heating heat medium detected by the auxiliary heat source unit outlet temperature sensor 4e, the return temperature sensor 14d, and the heat medium temperature sensor 17b provided in the heating circuit 17. The pump 7, the auxiliary heat source unit 3, and the heating pump 17a are controlled to perform the heating operation so that the temperature of the heating heat medium becomes a predetermined heat medium temperature.

Next, the bath chasing operation will be described.
The bath chasing operation is performed using the heat of hot water flowing through the hot water circulation circuit 14 by circulation operation similarly to the heating operation, and hot water is distributed to the bath heat exchanger 16 instead of the heating heat exchanger 15 of FIG. Let When the bath reheating operation is started, the control unit 20 drives the circulation pump 7 to open the electromagnetic valve 16a so that hot water flows through the bath heat exchanger 16. Further, in the reheating circuit 18, the bath pump 18a is driven to circulate bath water between the bath heat exchanger 16 and a bath (not shown).

  Based on the temperature of the circulating hot water and the temperature of the bath water detected by the bath temperature sensor 18b provided in the auxiliary temperature source outlet temperature sensor 4e, the return temperature sensor 14d and the reheating circuit 18, the control unit 20 is a circulation pump. 7, the auxiliary heat source unit 3, and the bath pump 18 a are controlled, and the bath reheating operation is performed so that the temperature of the bath water becomes a predetermined bath temperature.

  As shown in FIG. 4, the hot water storage hot water supply / heating device 1 is configured to be able to execute a simultaneous operation in which a hot water supply operation and a circulation operation are performed simultaneously using the auxiliary heat source unit 3. In the simultaneous operation, the control unit 20 is required for hot water supply based on the amount of water detected by the circulating water amount sensor 8 and the hot water supply amount sensor 11a and the temperature detected by the mixing valve inlet temperature sensor 4f and the hot water supply temperature sensor 11b. The flow rate required for hot water supply downstream of the regulating valve 4g of the lower outlet hot water passage 4c and the required flow rate for circulation of the hot water circulation circuit 14 required for heating or bathing are calculated. Moreover, the control part 20 performs the variable control which adjusts the mixing ratio of the three-way valve 5 according to the ratio of the calculated hot water supply required flow rate and the circulation required flow rate, and corrects and adjusts the mixing ratio according to other conditions.

Next, variable control of the three-way valve 5 during simultaneous operation will be described with reference to FIG. Si (i = 1, 2,...) Represents a step.
When the three-way valve variable control is started by starting the simultaneous operation, the three-way valve 5 is adjusted to the initial mixing ratio in S1. The initial mixing ratio is a mixing ratio set in advance so as to ensure a predetermined hot water flow rate.

  Next, in S2, it is determined whether or not a state where the calculated required hot water supply flow rate is less than γL per minute (for example, 3L per minute) continues for Ta seconds (for example, 1 second) or more. If the determination is Yes, the process proceeds to S3, and if the determination is No, the process proceeds to S9. In S3, it is determined whether or not the operation time after adjusting the three-way valve 5 to the initial mixing ratio exceeds Tb seconds (for example, 3 seconds). If the determination is Yes, the process proceeds to S4, and if the determination is No, the process returns to S1.

  Next, in S4, it is determined whether the hot water supply operation or the circulation operation is stopped. When determination is Yes, it progresses to S15, adjusts the three-way valve 5 to respond | correspond to the present driving | operation, and complete | finishes three-way valve variable control. If the determination is No, the process proceeds to S5.

  Next, in S5, it is determined whether or not the opening degree of the regulating valve 4g is equal to or less than a set opening degree (for example, a valve opening degree of 50%). If the determination is Yes, the process proceeds to S6, and if the determination is No, the process proceeds to S12.

  Next, in S6, the temperature difference between the outlet temperature of the auxiliary heat source unit 3 detected by the auxiliary heat source unit outlet temperature sensor 4e and the outlet temperature of the outlet passage 4 detected by the mixing valve inlet temperature sensor 4f is set as the set temperature. It is determined whether or not it is higher than one set temperature α ° C. (for example, 2 ° C.). That is, it is determined whether or not there is a temperature drop greater than the first set temperature α ° C. before the hot water heated by the auxiliary heat source device 3 reaches the mixing valve 6. If the determination is Yes, it is determined that the hot water in the hot water storage tank 2 is flowing into the lower effluent hot water passage portion 4c via the tank hot water discharge passage portion 4h, and the process proceeds to S7, and if the determination is No, the process proceeds to S12.

  Next, in S7, the hot water storage tank 2 side that flows through the upper effluent hot water passage portion 4a in order to increase the hot water pressure of the lower effluent hot water passage portion 4c and suppress the hot water of the hot water storage tank 2 from flowing into the lower effluent hot water passage portion 4c. The mixing ratio of the three-way valve 5 is corrected and adjusted so as to increase the flow rate of the water (so as to reduce the flow rate on the hot water circulation circuit 14 side). Next, in S8, the difference between the outlet temperature detected by the auxiliary heat source unit outlet temperature sensor 4e and the tapping temperature detected by the mixing valve inlet temperature sensor 4f is a second set temperature β ° C. (for example, 0.5 ° C.). It is determined whether or not. If the determination is Yes, it is determined that the flow of hot water from the hot water storage tank 2 into the lower effluent hot water passage portion 4c is suppressed, and the process returns to S4. If the determination is No, the process returns to S7.

  On the other hand, when the determination in S2 is No, in S9, the mixing ratio of the three-way valve 5 is increased so as to increase the flow rate on the hot water storage tank 2 side that flows through the upper spilled hot water passage portion 4a based on the calculated required hot water supply flow rate and required circulation flow rate. The process proceeds to S10. In S10, it is determined whether or not the operation time after adjusting the mixing ratio of the three-way valve 5 in S9 exceeds Tc seconds (for example, 2 seconds). If the determination is Yes, the process proceeds to S10, and if the determination is No, the process returns to S9.

  Next, in S11, it is determined whether the hot water supply operation or the circulation operation is stopped. When determination is Yes, it progresses to S15, adjusts the three-way valve 5 to respond | correspond to the present driving | operation, and complete | finishes three-way valve variable control. If the determination is No, the process proceeds to S12.

  Next, in S12, as to the driving state of the circulation pump 7, for example, whether the state of driving at a set rotation speed that is a reference in the vicinity of the upper limit of the rotation speed of the circulation pump 7 continues for Td seconds (for example, 2 seconds) or more Judge whether or not. If the determination is Yes, the process proceeds to S13, and if the determination is No, the process returns to S4.

  Next, in S13, it is determined whether or not the calculated required circulation flow rate is equal to or higher than the required hot water supply flow rate. If the determination is Yes, the mixing ratio of the three-way valve 5 is corrected and adjusted to increase the flow rate on the hot water circulation circuit 14 side in S14, and the process returns to S4. If the determination is No, the process returns to S1. In addition, the said time, temperature, and a valve opening degree can be suitably set according to the specification etc. of the hot water storage hot-water supply heating apparatus 1, and are not limited to said value.

Next, the operation and effect of the hot water storage hot water supply / heating device 1 of the present invention will be described.
The hot water storage hot water heater 1 according to the present invention adjusts the mixing ratio of the three-way valve 5 based on the calculated required hot water supply flow rate and the required circulation flow rate when the auxiliary heat source unit 3 is used for simultaneous hot water supply operation and circulation operation. Therefore, the hot water can be heated by appropriately utilizing the heating capability of the auxiliary heat source device 3. In addition, since the mixing ratio of the three-way valve 5 is corrected and adjusted according to the driving state of the circulation pump 7, simultaneous operation can be performed with the rotation speed of the circulation pump 7 lowered.

  In addition, when the rotation speed of the circulation pump 7 is equal to or higher than the set rotation speed and the calculated required circulation flow rate is higher than the required hot water supply flow rate, the mixing ratio of the three-way valve 5 is corrected so as to increase the flow rate on the hot water circulation circuit 14 side. Since it adjusts, the water flow resistance in the three-way valve 5 can be reduced, the number of rotations of the circulation pump 7 can be reduced, and the flow rate of the hot water circulation operation can be increased. Can be heated.

  Moreover, since the mixing ratio of the three-way valve 5 is corrected and adjusted in accordance with the outlet temperature of the auxiliary heat source unit 3 and the hot water temperature of the hot water passage 4, it is possible to suppress a decrease in the hot water temperature flowing through the lower effluent hot water passage portion 4c. . In addition, when the difference between the outlet temperature of the auxiliary heat source unit 3 and the hot water temperature in the hot water passage 4 is larger than the set temperature, the mixing ratio of the three-way valve 5 is corrected and adjusted to increase the flow rate on the hot water storage tank 2 side. The tapping pressure in the bottom outflow hot water passage portion 4c increases. Therefore, it is possible to prevent hot water in the hot water storage tank 2 from being mixed into the lower effluent hot water passage portion 4c from the tank hot water hot water passage portion 4h without being heated, and to suppress a decrease in the hot water temperature.

  In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications.

DESCRIPTION OF SYMBOLS 1 Hot water storage hot water heater 2 Hot water storage tank 3 Auxiliary heat source machine 4 Outlet passage 4e Auxiliary heat source machine outlet temperature sensor 4f Mixing valve inlet temperature sensor 4g Regulating valve 5 Three-way valve 6 Mixing valve 7 Circulating pump 8 Circulating water amount sensor 9 Feeding water path 10 Feed water bypass Passage 11 Hot water supply passage 11a Hot water supply amount sensor 11b Hot water supply temperature sensor 14 Hot water circulation circuit 14a Upstream hot water circulation passage 15 Heating heat exchanger 16 Bath heat exchanger 20 Controller

Claims (5)

A hot water storage tank for storing hot water heated by the heating means, a water supply passage connected to the lower part of the hot water storage tank, a hot water supply passage connected to the upper part of the hot water storage tank, and an auxiliary heat source device provided in the hot water supply passage A hot water circulation circuit branched from the hot water passage downstream from the auxiliary heat source unit and connected to the hot water passage upstream from the auxiliary heat source unit, and a heat exchanger provided in the hot water circulation circuit, A three-way valve provided at a connection portion between the hot water passage and the hot water circulation circuit, and a circulation means provided in the hot water passage between the auxiliary heat source device and the three-way valve, and driving the circulation means. A hot water supply operation for mixing hot water in the hot water storage tank and hot water in the hot water circulation circuit by the three-way valve and discharging hot water heated by the auxiliary heat source machine from the hot water outlet passage, and hot water heated by the auxiliary heat source machine in front In the hot-water storage water heater heating system for simultaneous operation of the circulation operation utilizing in the heat exchanger,
The mixing ratio of the three-way valve calculates the required hot water flow required for the hot water operation and the required circulating flow required for the circulation operation, and sets the mixing ratio according to these ratios. .   The hot water storage / heating apparatus according to claim 1, wherein the mixing ratio of the three-way valve is corrected and adjusted in accordance with a driving state of the circulation means.   When the rotational speed of the circulation means is equal to or higher than a set rotational speed and the required circulation flow rate is equal to or higher than the required hot water supply flow rate, the mixing ratio of the three-way valve is corrected and adjusted to increase the flow rate on the hot water circulation circuit side. The hot water storage hot water supply / heating device according to claim 2, wherein   The hot water storage hot-water supply / heating apparatus according to claim 1 or 2, wherein the mixing ratio of the three-way valve is corrected and adjusted according to an outlet temperature of the auxiliary heat source unit and a hot water temperature of the hot water passage.   When the difference temperature between the outlet temperature of the auxiliary heat source machine and the hot water temperature in the hot water passage is larger than a set temperature, the mixing ratio of the three-way valve is corrected and adjusted so as to reduce the flow rate on the hot water circulation circuit side. The hot water storage hot water supply / heating device according to claim 4.