JP2005207672A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of preventing the impairing of operation efficiency of a heating means by being constituted to positively circulate the heat storage fluid of intermediate temperature to a heat exchanger for supplying the hot water. <P>SOLUTION: A hot water storage tank 10 for storing the heat storage fluid is provided with a high-temperature taking-out pipe 12 for taking out the heat storage fluid of high temperature and an intermediate-temperature taking-out pipe 13 for taking the the heat storage fluid of intermediate temperature. A heat exchanger 50 for reheating is constituted to take out the heat exchanged-heat storage fluid to the intermediate-temperature taking-out pipe 13, and the heat exchanger 30 for supplying the hot water is constituted to circulate the heat storage fluid of high temperature taken out from the high-temperature taking-out pipe 12 or both of the heat storage fluid of high temperature taken out from the high-temperature taking-out pipe 12 and the heat storage fluid of intermediate temperature taken out from the intermediate-temperature taking-out pipe 13 to a first circulation part 30a. Whereby the impairing of operation efficiency can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water storage tank comprising a hot water storage tank for storing the heat storage fluid heated by the heating means, and a hot water supply heat exchanger for exchanging heat between the heat storage fluid stored in the hot water storage tank and the hot water supply water. In particular, it relates to the consumption of medium temperature heat storage fluid among the heat storage fluid stored in the hot water storage tank.

  Conventionally, as this kind of hot water storage type hot water supply apparatus, for example, a hot water supply system as shown in Patent Document 1 is known. In this hot water storage type hot water supply apparatus, as shown in FIG. 9, the hot water storage tank 100 that stores the heat storage fluid therein, and the fluid heating that sends the lowermost heat storage fluid in the hot water storage tank 100 to the uppermost portion in the hot water storage tank 100. Channel 110, heating means 120 provided in the fluid heating channel 110 for heating the heat storage fluid flowing through the fluid heating channel 110, and the first heat storage fluid in the hot water storage tank 100 circulates. The hot water supply heat is configured such that the flow portion 130a and the second flow portion 130b through which the hot water supply water flows are provided adjacent to each other, and the heat storage fluid and the hot water supply water are opposed to each other, and exchange heat between them. The circulation path 140 for taking out the heat storage fluid heated from the exchanger 130 and the upper part of the hot water storage tank 100, passing the first circulation part 130a, and returning it to the lower part of the hot water storage tank 100, and this circulation path A pump means 150 for circulating the heat storage fluid 40, and a flow control means 160 for controlling the flow rate of the heat storage fluid flowing through the first flowing part 130a through the circulation passage 140.

  According to the above configuration, by using the hot water supply heat exchanger 130 and controlling the flow rate of the heat storage fluid flowing through the first circulation part 130a, the heat storage after passing through the first circulation part 130a. The temperature of the fluid can be reduced to near the temperature of the hot water supply water before heating. This makes it possible to minimize the heat loss during heat exchange between the heat storage fluid and the hot water supply water, thereby realizing an efficient hot water supply system (see, for example, Patent Document 1).

In addition to the hot water supply function described above, a reheating heat exchanger for exchanging heat between the heat storage fluid stored in the hot water storage tank and the bath water in the bathtub is disposed in the hot water storage tank. A bath water replenishing system is known in which bath water in a bathtub is circulated through this reheating heat exchanger to retreat the bath water to a predetermined temperature (see, for example, Patent Document 2).
JP 2001-153458 A Japanese Patent Laid-Open No. 2003-19497

  However, according to Patent Document 1, the hot water temperature of the heat storage fluid in the hot water storage tank 100 immediately after boiling by the heating means 120 is in a high temperature state (for example, about 85 ° C.). After starting the boiling operation after a predetermined time has elapsed after using hot water in which the fluid and hot water supply are subjected to heat exchange, as shown in FIG. 9, a high temperature portion (for example, 85 ° C.) is located above the hot water storage tank 100. Degree), a low temperature part (for example, about 9 ° C.) below, and a medium temperature part (for example, about 45 ° C.) between the upper side and the lower side due to the difference in specific gravity.

  Moreover, according to the above-mentioned Patent Document 2, the hot water stored in the hot water storage tank is replenished with hot water so that the hot water (for example, about 85 ° C.) and the low temperature part (for example, about 85 ° C.) , About 9 ° C.), the heat storage fluid having a medium temperature (about the bath water temperature) increases.

  By the way, as a heating means, for example, in a heat pump type heating means comprising a heat pump cycle, when the heat storage fluid is heated to a target temperature (for example, 65 to 90 ° C.), the hot water temperature of the heat storage fluid before heating is high. The higher the high pressure, the lower the operating efficiency (COP = heating capacity / power consumption).

  In view of the above, the object of the present invention is to prevent a decrease in the operating efficiency of the heating means by configuring the medium temperature heat storage fluid to actively circulate through the hot water supply heat exchanger. An object of the present invention is to provide a hot water storage type hot water supply device that can be used.

In order to achieve the above object, the technical means described in claims 1 to 12 are employed. That is, in the invention described in claim 1, the hot water storage tank (10) for storing the heat storage fluid therein, and the lowermost heat storage fluid in the hot water storage tank (10) are disposed at the uppermost portion in the hot water storage tank (10). A fluid heating channel (21) to be sent, a heating means (20) provided in the fluid heating channel (21) for heating the heat storage fluid flowing in the fluid heating channel (21), and a hot water storage tank ( 10) The 1st distribution part (30a) through which the fluid for heat storage in the inside distributes, and the 2nd distribution part (30b) through which hot water supply distributes are provided adjacent, and the heat storage fluid and hot water supply water counter flow In the hot water storage type hot water supply apparatus comprising the heat exchanger for hot water supply (30) configured to be and to exchange heat between the two,
A reheating heat exchanger (60) for exchanging heat between the heat storage fluid in the hot water storage tank (10) and the bath water in the bathtub is provided, and the hot water supply heat exchanger (30) is a first circulation part. Of the heat storage fluid stored in the hot water storage tank (10) which is configured such that the downstream end of (30a) communicates with the lower part of the hot water storage tank (10) and is heated by the heating means (20), 1st circulation part (30a) for the medium temperature heat storage fluid containing the heat storage fluid of the other, or the heat storage fluid heat-exchanged by the reheating heat exchanger (60), or both the high temperature and the medium temperature heat storage fluid It is characterized by being configured to circulate.

  According to the invention described in claim 1, by replenishing the bath water by the reheating heat exchanger (60), the heat storage fluid having a medium temperature which is low in heat and subjected to heat exchange increases. After the medium temperature heat storage fluid is circulated to the first circulation part (30a), the medium temperature heat storage fluid is actively consumed and the first circulation part (30a) is circulated. The hot water temperature of the heat storage fluid can be further lowered than the intermediate temperature. Thereby, the fall of the operation efficiency of the heating means (20) at the time of a boiling operation can be prevented by reducing the hot water temperature of the heat storage fluid before heating.

  In the invention according to claim 2, the hot water storage tank (10) is provided with a high temperature extraction pipe (12) for extracting a high temperature heat storage fluid and an intermediate temperature extraction pipe (13) for extracting an intermediate temperature heat storage fluid, The reheating heat exchanger (60) is configured such that the heat-exchanged heat-exchanged fluid is taken out to the intermediate temperature take-out pipe (13), and the hot water supply heat exchanger (30) is made up of the high-temperature take-out pipe (12 ) Or a high-temperature heat storage fluid extracted from the high-temperature extraction pipe (12) and a medium-temperature heat storage fluid extracted from the medium-temperature extraction pipe (13). 30a) is configured to be distributed.

  More specifically, according to the second aspect of the present invention, the medium-temperature heat storage fluid having a low hot water temperature, which has been heat-exchanged by the reheating heat exchanger (60), is taken out from the medium-temperature take-out pipe (13). The hot water storage heat exchanger (30) is configured to circulate, so that the medium temperature heat storage fluid is actively consumed, and the hot water storage temperature is lower than that of the medium temperature heat storage fluid. Since the working fluid can be returned to the hot water storage tank (10), it is possible to prevent the operating efficiency of the heating means (20) from being lowered during the boiling operation.

  In the invention according to claim 3, in the hot water supply heat exchanger (30), the upstream end of the first circulation part (30a) is connected to the downstream side of the high temperature extraction pipe (12), and the first circulation part The middle part of (30a) is connected to the downstream side of the intermediate temperature extraction pipe (13). According to the third aspect of the present invention, on the downstream side from the middle of the first circulation part (30a), the upstream side of the second circulation part (30b) through which the hot water supply water circulates and the medium temperature heat storage fluid. Since the heat exchange is performed, the hot water storage fluid having the temperature lowered efficiently can be returned to the hot water storage tank (10).

  In the invention according to claim 4, in the reheating heat exchanger (60), the third circulation part (60a) through which the heat storage fluid in the hot water storage tank (10) circulates and the bath water in the bathtub circulates. The fourth circulation part (60b) is provided adjacently, the heat storage fluid and the bath water in the bathtub are configured to face each other, and the upstream end of the third circulation part (60a) It is connected to the high temperature take-out pipe (12), and the downstream end of the third circulation part (60a) is taken out to the medium temperature take-out pipe (13).

  According to the fourth aspect of the present invention, by using a counter-flow heat exchanger, the heat storage fluid after flowing through the third circulation part (60a) is heated to about the hot water temperature of the bath water before heat exchange. The hot water storage fluid is actively consumed by the hot water supply heat exchanger (30), so that the hot water storage fluid lower than the intermediate temperature is returned to the hot water storage tank (10). be able to. Thereby, the fall of the operating efficiency of the heating means (20) at the time of boiling operation can be prevented.

  In the invention described in claim 5, the reheating heat exchanger (60) is disposed above the hot water storage tank (10), and the heat storage fluid in the hot water storage tank (10) and the bathtub that circulates inside the hot water storage tank (10). It is characterized by being configured to exchange heat with both the bath water inside.

  According to the fifth aspect of the present invention, for example, by arranging the reheating heat exchanger (60) formed in a spiral shape in the hot water storage tank (10), the hot water storage is performed by heat exchange with the bath water. The medium temperature fluid is stored in the tank (10), and the medium temperature heat storage fluid is actively consumed by the hot water supply heat exchanger (30) in the same manner as in the fourth aspect. The heat storage fluid having a lower hot water temperature can be returned to the hot water storage tank (10). Thereby, the fall of the operating efficiency of the heating means (20) at the time of boiling operation can be prevented.

  In the invention described in claim 6, a water temperature sensor (55) for detecting the hot water temperature of the heat storage fluid is provided in the vicinity of the upstream end of the intermediate temperature extraction pipe (13), and the hot water supply heat exchanger (30) includes: When the hot water temperature detected by the water temperature sensor (55) is lower than a predetermined temperature, a high-temperature heat storage fluid taken out from the high-temperature take-out pipe (12) is circulated to the first circulation part (30a), and the water temperature sensor (55) The medium temperature heat storage fluid taken out from the medium temperature take-out pipe (13) when the hot water temperature detected by the temperature is equal to or higher than the predetermined temperature, or the medium temperature heat storage fluid taken out from the medium temperature take-out pipe (13) and the high temperature take-out pipe (12) Both the high-temperature heat storage fluid taken out from the first distribution section (30a) is distributed to the first distribution section (30a).

  According to the invention described in claim 6, among the heat storage fluid stored in the hot water storage tank (10), the medium temperature heat storage fluid can be actively taken out and the hot water heat storage fluid whose temperature has decreased. Can be returned to the hot water storage tank (10). As a result, a large amount of low-temperature heat storage fluid is stored, and it is possible to prevent a decrease in operating efficiency of the heating means (20) during the boiling operation.

  In the invention according to claim 7, the flow rate ratio adjusting means (16) for adjusting the respective flow rate ratios is provided at the downstream side joining portion of the high temperature take-out pipe (12) and the medium temperature take-out pipe (13), thereby adjusting the flow rate ratio. The means (16) is taken out from the intermediate temperature extraction pipe (13) or from the intermediate temperature extraction pipe (13) when the hot water temperature detected by the water temperature sensor (55) is equal to or higher than a predetermined temperature. The medium heat storage fluid and the high-temperature heat storage fluid extracted from the high-temperature extraction pipe (12) are adjusted so as to be distributed to the first distribution section (30a).

  According to the seventh aspect of the present invention, among the heat storage fluids stored in the hot water storage tank (10) by the water temperature sensor (55) and the flow rate adjusting means (16), the medium temperature heat storage fluid is positively The hot water storage fluid having a reduced temperature can be easily returned to the hot water storage tank (10).

  In the invention described in claim 8, the intermediate temperature extraction pipe (13) is provided with a first flow rate adjusting means (16a) for adjusting the flow rate of the medium temperature heat storage fluid flowing through the intermediate temperature extraction pipe (13). The first flow rate adjusting means (16a) is a medium-temperature heat storage fluid or intermediate temperature extraction pipe that is taken out from the intermediate temperature extraction pipe (13) when the hot water temperature detected by the water temperature sensor (55) is equal to or higher than a predetermined temperature. It is characterized in that both the medium temperature heat storage fluid taken out from (13) and the high temperature heat storage fluid taken out from the high temperature take-out pipe (12) are adjusted to circulate in the first flow section (30a). Yes.

  According to the invention described in claim 8, as in the case of claim 7 described above, the heat storage fluid stored in the hot water storage tank (10) by the water temperature sensor (55) and the first flow rate adjusting means (16a). Among them, it is possible to positively take out the medium temperature heat storage fluid and to easily return the hot water heat storage fluid whose temperature has decreased to the hot water storage tank (10).

  In the invention according to claim 9, at least two or more intermediate temperature extraction pipes (13) are provided, and any one of the medium temperature storage fluids is selected to select the first circulation part (30 a). It is characterized by being configured to circulate. According to the ninth aspect of the present invention, the portion where the intermediate temperature storage fluid is stored is not uniform in the vertical direction of the hot water storage tank (10), so that a plurality of intermediate temperature extraction pipes (13) are provided. It is possible to positively and actively take out the medium-temperature heat storage fluid.

  In the invention according to claim 10, the water temperature sensor before heat exchange (54) for detecting the hot water temperature of the medium temperature heat storage fluid taken out from the middle temperature take-out pipe (13) flowing through the first flow part (30a) is provided. The flow rate ratio adjusting means (16) or the first flow rate adjusting means (16a) is provided so that the hot water temperature detected by the pre-heat exchange water temperature sensor (54) is adjusted to be equal to or higher than a predetermined temperature. Yes.

  According to the invention described in claim 10, by setting the hot water temperature flowing through the hot water supply heat exchanger (30) to a predetermined temperature or higher, the hot water supply water downstream of the second circulation portion (30b) is set at a predetermined temperature ( For example, it is possible to ensure a set temperature + 5 ° C.

  In the invention according to claim 11, on the downstream side of the second circulation section (30b), heat exchange is performed by the hot water supply heat exchanger (30) to the hot water supplied by the hot water supply heat exchanger (30). A hot water supply temperature adjusting means (35) for adjusting the temperature of the hot water supply water by mixing with the hot water supply water before being provided is provided.

  According to the eleventh aspect of the present invention, the temperature of the hot water supplied by the hot water supply heat exchanger (30) is increased due to overshoot at the time of transition immediately after the hot water supply or due to fluctuations in the flow rate of the hot water during steady hot water supply. Even if the temperature fluctuates somewhat, the hot water temperature is again mixed with the tap water from the hot water temperature adjusting means (35) and adjusted, so that fluctuations in the hot water temperature resulting therefrom can be easily absorbed and The temperature control of the hot water supply water can be performed with high accuracy.

  In the invention according to claim 12, the heating means (20) is a supercritical heat pump cycle in which the high-pressure side pressure of the refrigerant is equal to or higher than the critical pressure, and heats the heat storage fluid with the refrigerant whose pressure is increased to the critical pressure or higher. It is characterized by.

  According to the invention of claim 12, in the supercritical heat pump cycle, when heating the heat storage fluid to a target temperature (for example, 65 to 90 ° C.), the lower the hot water temperature of the heat storage fluid before heating, Cycle efficiency (COP = heating capacity / power consumption) is improved by lowering the high pressure. Therefore, by heating the heat storage fluid that has been reduced to the vicinity of the temperature of the hot water supply water before heating in the supercritical heat pump cycle, cycle efficiency can be improved and power saving operation can be performed.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, a hot water storage type hot water supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic view showing an overall configuration of a hot water storage type hot water supply apparatus to which the present invention is applied, and FIG. 2 is a cross section of an outer pipe and an inner pipe constituting a hot water supply heat exchanger 30 and a reheating heat exchanger 60. It is sectional drawing which shows a shape. FIG. 3 is a schematic diagram showing an overall configuration of a hot water storage type hot water supply apparatus that is a modification of the present embodiment.

  The hot water storage type hot water supply apparatus according to the present embodiment is used for general households, and uses a heat storage fluid stored in the hot water storage tank 10 as a heat source to exchange heat with hot water supply water, in a kitchen, a washroom, a bathroom, and the like. In addition to the hot water supply function, the hot water filling of the bathtub and the function of chasing the hot water filled bath water are provided.

  First, as shown in FIG. 1, the hot water supply function includes a hot water storage tank 10 that stores a heat storage fluid therein, and a fluid heating fluid that sends the lowest heat storage fluid in the hot water storage tank 10 to the uppermost portion in the hot water storage tank 10. A heat pump unit 20 that is a heating means that heats the heat storage fluid that flows through the flow path 21, the fluid heating flow path 21, and an outer pipe 30 a that is a first flow section through which the heat storage fluid in the hot water storage tank 10 flows. And an inner pipe 30b, which is a second flow part through which hot water for water circulates, are provided adjacent to each other, and the heat storage fluid and the hot water for water supply are opposed to each other, and heat exchange is performed between them. The heat exchanger 30, the circulation circuit 11 for returning the heat storage fluid in the hot water storage tank 10 to the outer pipe 30a side of the hot water supply heat exchanger 30, and then returning to the lower part in the hot water storage tank 10, and the hot water supply heat On the inner tube 30b of the exchanger 30 Water supply pipe 31 connected to the side, hot water supply pipes 32 and 33 connected to the downstream side of the inner pipe 30b, and a control device for controlling the operation of the hot water supply system (hot water supply control unit 41, heat source control unit 42) It consists of and.

  The hot water filling and reheating function is performed by the outer pipe 60a that is the third circulation part through which the heat storage fluid in the hot water storage tank 10 circulates and the inner pipe 60b that is the fourth circulation part through which the bath water in the bathtub flows. Are disposed adjacent to each other, and the heat storage fluid and the bath water are configured to face each other, and a reheating heat exchanger 60 for exchanging heat between the two and a heat storage fluid in the hot water storage tank 10 are provided. After circulating to the outer pipe 60a side of the reheating heat exchanger 60, the circulation circuit 11a for returning to the center of the hot water storage tank 10 and the inner pipe of the reheating heat exchanger 60 for the bath water in the bathtub. From the bath water circulation circuit 61 that circulates to the bath 60b and returns to the bathtub, the hot water supply pipes 32a and 33a for filling the bath, and the control device (the hot water supply control unit 41) that controls the operation of the bath water reheating system It is configured.

  The components constituting the hot water supply function will be described more specifically. The hot water storage tank 10 of the present embodiment is opened to the atmosphere through the air holes 10a, and the interior of the hot water storage tank 10 is maintained at atmospheric pressure. The hot water storage tank 10 is formed of, for example, a resin material and has a rectangular parallelepiped shape. Further, in order to reduce the heat stored in the heat storage fluid in the hot water storage tank 10 from being released into the atmosphere from the wall surface of the hot water storage tank 10, the outer periphery of the hot water storage tank 10 is covered with a heat insulating material such as glass wool or urethane. May be.

  Further, the heat storage fluid used is mainly water, and preservatives, antifreeze agents, LLC, and the like are added as necessary. In addition to these, a heat storage material having a high specific heat may be encapsulated by a technique such as a microcapsule and dispersed in water, or may be made into a thriller and flowable.

  Further, on the outer wall surface of the hot water storage tank 10, a plurality of (seven in this example) hot water storage thermistors 55, which are water temperature sensors for detecting the amount of hot water stored in the heat storage fluid or the hot water storage temperature, are provided in the vertical direction (of the hot water storage tank 10. Temperature information at each water level of the heat storage fluid filled in the hot water storage tank 10 is output to the hot water supply control unit 41 described later.

  Therefore, based on the temperature information from the plurality of hot water storage thermistors 55, the hot water supply control unit 41 and the hot water heated above the hot water storage tank 10 and the low temperature heat storage fluid before being heated below the hot water storage tank 10 Can be detected, and the hot water temperature of the heat storage fluid at each water level can be detected. Of the plurality of hot water storage thermistors 55, the hot water storage thermistor 55 provided at the uppermost part has a function of detecting the temperature of hot water discharged from the hot storage fluid.

  The heat pump unit 20 that heats the heat storage fluid uses a supercritical heat pump cycle in which, for example, carbon dioxide gas is used as a refrigerant so that the refrigerant pressure on the high-pressure side becomes equal to or higher than the critical pressure of the refrigerant. As is well known, this heat pump cycle includes refrigeration cycle functional parts such as a compressor, a heat storage heat exchanger, an expansion valve, an evaporator, and an accumulator (not shown). Incidentally, the compressor (not shown) is driven by a built-in electric motor (not shown), compresses the gaseous refrigerant sucked from the accumulator to a critical pressure or more, and discharges it.

  The heat storage heat exchanger (not shown) exchanges heat between the refrigerant and the heat storage fluid. For example, a refrigerant passage (not shown) through which the refrigerant flows and a heat storage fluid passage (not shown) through which the heat storage fluid flows are provided. Is a counterflow type heat storage heat exchanger (not shown) that is provided in a double-pipe structure and is configured such that the flow direction of the refrigerant and the flow direction of the heat storage fluid are opposed to each other. The expansion valve (not shown) depressurizes the refrigerant flowing out from the heat storage heat exchanger and supplies it to the evaporator (not shown). An evaporator (not shown) evaporates the refrigerant decompressed by an expansion valve (not shown) by heat exchange with the atmosphere. An accumulator (not shown) gas-liquid separates the refrigerant flowing out of the evaporator, sucks only the gas-phase refrigerant into the compressor, and stores excess refrigerant in the cycle.

  In addition, a heat storage fluid passage (not shown) of the heat storage heat exchanger is connected to the hot water storage tank 10 via the fluid heating passage 21 described above, and an electric pump (not shown) is operated, whereby the hot water storage tank 10 The heat storage fluid circulates. The upstream end of the fluid heating channel 21 is connected to the bottom 10 b of the hot water storage tank 10, and the downstream end of the fluid heating channel 21 is connected to the upper part 10 c of the hot water storage tank 10. As a result, the heat storage fluid heated by heat exchange with the refrigerant in the heat storage heat exchanger (not shown) is sent to the upper part 10c of the hot water storage tank 10, so that the upper part in the hot water storage tank 10 moves from the upper side to the lower side. The heat is then stored in the heat storage fluid.

  The heat pump unit 20 is operated by a control signal from a heat source control unit 42 described later, and outputs an operation state to the heat source control unit 42. In addition, the AC power is used as the power source, and the heat storage operation for boiling the heat storage fluid in the hot water storage tank 10 is performed mainly using the midnight power in the midnight time zone where the rate setting is the cheapest. Even in the belt, when the hot water temperature of the heat storage fluid decreases, the boiling operation is controlled. Incidentally, according to the supercritical heat pump cycle, a heat storage fluid having a temperature higher than that of a general heat pump cycle (for example, 85 to 90 ° C.) can be stored therein.

  Next, the circulation circuit 11 distributes the heat storage fluid in the hot water storage tank 10 to an outer pipe 30a of the hot water supply heat exchanger 30 described later, and the heat storage fluid heat-exchanged by the hot water supply heat exchanger 30 is stored in the hot water storage tank. 10 is a circulation circuit for returning to the lower part 10e in the high-temperature take-out pipe 12, the medium-temperature take-out pipe 13, the forward pipe 14, the return pipe 15, the high-medium temperature mixing valve 16 serving as the flow rate adjusting means, and the first circulation pump. 17.

  The high-temperature take-out pipe 12 is a pipe for taking out a high-temperature heat storage fluid among the heat storage fluid stored in the hot water storage tank 10, and an upstream end is connected to the upper portion 10 d in the hot water storage tank 10. The medium temperature take-out pipe 13 is a pipe for taking out the medium temperature heat storage fluid having a lower temperature than the high temperature heat storage fluid among the heat storage fluid stored in the hot water storage tank 10. The upstream end is connected between 10d and the lower part 10e.

  The upstream pipe 14 has an upstream end connected to an outlet side of a high / medium temperature mixing valve 16 described later, and a downstream end connected to an upstream end of the outer pipe 30 a of the hot water supply heat exchanger 30. The return pipe 15 has an upstream end connected to the upstream end of the outer pipe 30 a and a downstream end connected to the lower portion 10 e in the hot water storage tank 10. The forward pipe 14 is provided with a thermistor 54 before heat exchange, which is a pre-heat exchange water temperature sensor that detects the hot water temperature of the heat storage fluid that flows through the outer pipe 30 a of the hot water supply heat exchanger 30. The temperature information is output to a hot water supply control unit 41 described later.

  Next, the high / medium temperature mixing valve 16 is provided at the downstream junction of the high temperature take-out pipe 12 and the intermediate temperature take-out pipe 13 and adjusts the hot water temperature of the heat storage fluid that flows through the outer pipe 30a of the hot water supply heat exchanger 30. And adjusting the ratio of the respective opening areas to adjust the mixing ratio between the high-temperature heat storage fluid taken out from the high-temperature take-out pipe 12 and the medium-temperature heat storage fluid taken out from the medium-temperature take-out pipe 13. I am doing so.

  The high / medium temperature mixing valve 16 is electrically connected to a hot water supply control unit 41 described later, and is controlled based on the temperature information of the heat storage fluid detected by the hot water storage thermistor 55 and the thermistor 54 before heat exchange. Is done. Incidentally, in this embodiment, when the hot water temperature of the heat storage fluid detected by the hot water storage thermistor 55 (in the vicinity of the intermediate temperature extraction pipe 13) is lower than a predetermined temperature (for example, 30 ° C.), the high temperature extracted from the high temperature extraction pipe 12 is high. The heat storage fluid is controlled to flow through the outer tube 30a.

  On the other hand, when the hot water temperature of the heat storage fluid detected by the hot water storage thermistor 55 (in the vicinity of the intermediate temperature extraction pipe 13) is equal to or higher than a predetermined temperature (for example, 30 ° C.), Control is performed so that both the medium-temperature heat storage fluid extracted from the medium-temperature extraction pipe 13 and the high-temperature heat storage fluid extracted from the high-temperature extraction pipe 12 are mixed and distributed to the outer pipe 30a.

  Further, the high / medium temperature mixing valve 16 adjusts the temperature of the hot water of the heat storage fluid flowing through the primary side passage 30A (outer pipe 30a) detected by the thermistor 54 before heat exchange so as to be equal to or higher than a predetermined temperature. The hot water supply water flowing through the secondary passage 30B (inner pipe 30b) is kept from being below a predetermined temperature (for example, about a set temperature + 5 ° C.). Thus, more medium temperature heat storage fluid in the vicinity of a predetermined temperature (for example, 30 ° C.) than the high temperature heat storage fluid is circulated to the outer pipe 30a. Further, the high / medium temperature mixing valve 16 performs feedback control based on the hot water temperature of the heat storage fluid before heat exchange detected by the thermistor 54 before heat exchange.

  The first circulation pump 17 is arranged in the middle of the return pipe 15 and is a pump for circulating the heat storage fluid in the hot water storage tank 10 to the hot water supply heat exchanger 30. And the hot water supply control part 41 mentioned later so that a rotation speed may be controlled based on the hot water temperature of the hot water for the hot water exchanged from the inner side pipe | tube 30b of the heat exchanger 30 for hot water supply detected by the thermistor 52 after the heat exchange mentioned later. Is electrically connected.

  The return pipe 15 is provided with a thermistor 56 after primary heat exchange for detecting the hot water temperature of the heat storage fluid after heat exchange, and the flow rate of circulating through the circulation circuit based on the hot water temperature of the heat storage fluid after heat exchange. It may be controlled by the first circulation pump 17. That is, by setting a restriction value for the number of rotations of the first circulation pump 17 so that the hot water temperature returned to the lower portion 10e in the hot water storage tank 10 does not exceed the predetermined temperature, the hot water temperature below the predetermined temperature is set in the hot water storage tank 10. Can be returned to the lower portion 10e. Further, a drain plug 18 is provided in the circulation circuit 11 and the fluid heating passage 21 so that the heat storage fluid in the hot water storage tank 10 and the circulation circuit 11 can be drained manually as needed. ing.

  Next, the hot water supply heat exchanger 30 is connected to the circulation circuit 11 so that the heat storage fluid in the hot water storage tank 10 flows, and the secondary side connected to the water supply pipe 31 and the hot water supply pipe 32. For example, as shown in FIG. 2, a second circulation portion that forms a secondary passage 30 </ b> B inside an outer pipe 30 a that is a first circulation portion that forms the primary passage 30 </ b> A, as shown in FIG. 2. This is a double tube structure through which a certain inner tube 30b is inserted. Here, it is desirable that the outer tube 30a use a resin material in order to keep heat loss low, and the inner tube 30b use a copper material having a high thermal conductivity.

  Further, the inner tube 30b may be a cylindrical tube similarly to the outer tube 30a. For example, as shown in FIG. In this case, the heat transfer area between the primary side passage 30A and the secondary side passage 30B increases, and the heat exchange efficiency between the heat storage fluid and the hot water supply water can be improved. In addition, 30c shown in the figure is a heat insulating material for preventing heat dissipation of the heat storage fluid.

  As shown in FIG. 1, the hot water supply heat exchanger 30 is arranged in the vertical direction outside the hot water storage tank 10, and the downstream end of the outer pipe 30 a (primary side passage 30 </ b> A) is connected to the lower portion 10 d of the hot water storage tank 10. Connected to the return pipe 15 so as to communicate with each other, the upstream end of the outer pipe 30 a (primary side passage 30 </ b> A) is connected to the forward pipe 14. The inner pipe 30b (secondary side passage 30B) has an upstream end connected to the water supply pipe 31 and a downstream end connected to the hot water supply pipe 32. Accordingly, as shown by arrows in FIG. 1, the hot water supply heat exchanger 30 has a flow direction of the heat storage fluid flowing through the outer tube 30a from the top to the bottom, and a hot water supply flowing through the inner tube 30b from the bottom to the top. It is a counterflow type heat exchanger with which the flow direction of water is opposed.

  The upstream of the water supply pipe 31 is connected to a water supply pipe so that the tap water is led to the hot water supply heat exchanger 30. Further, a water supply thermistor 51 is provided in the water supply pipe 31 so as to output temperature information of tap water to a hot water supply control unit 41 described later. The hot water supply pipe 32 has a flow rate adjusting valve 34 for adjusting the flow rate of hot water supplied through the inner pipe 30 b, and the hot water supply temperature adjustment at the junction of the downstream end of the hot water supply pipe 32 and the water supply pipe 31. A hot water mixing valve 35 is provided as a means. A hot water supply pipe 33 is connected to the outlet side of the hot water supply mixing valve 35.

  The hot water supply pipe 33 is a hot water supply pipe that leads to a hot water tap (not shown) such as a kitchen, a washroom, and a bathroom. A hot water supply thermistor 53 and a flow rate counter 58 are provided in the middle thereof. The hot water supply thermistor 53 provides temperature information in the hot water supply pipe 33, and the flow rate counter 58 provides flow information in the hot water supply pipe 33 to the hot water supply control unit 41 described later. I am trying to output. The hot water supply pipe 32 is provided with a post-heat exchange thermistor 52 that detects the hot water temperature of the heat storage fluid heat-exchanged by the hot water supply heat exchanger 30, and temperature information in the hot water supply pipe 33 is described later. The data is output to the control unit 41.

  The flow rate adjusting valve 34 is a valve that adjusts the flow rate flowing through the inner pipe 30b, and is controlled by the hot water supply control unit 41 described later so that the flow rate flowing through the inner pipe 30b is equal to or lower than a predetermined flow rate. That is, control is performed based on the hot water temperature of the hot water detected by the thermistor 52 after heat exchange so that the flow rate does not become excessive due to variations in the water pressure of the supplied water and the pressure loss in the hot water supply path.

  The hot water supply mixing valve 35 is a temperature adjustment valve that adjusts the temperature of hot water for hot water discharged from the hot water supply pipe 33, and by adjusting the ratio of the respective opening areas, the hot water supply water exchanged with the inner pipe 30b It is controlled to adjust the mixing ratio with tap water to the set temperature. The hot-water supply mixing valve 35 is electrically connected to a hot-water supply control unit 41, which will be described later. The hot-water supply water temperature information detected by the hot-water supply thermistor 51, the post-heat exchange thermistor 52, and the hot-water supply thermistor 53 is used. Controlled based on.

  Incidentally, the hot water temperature of the hot water supplied through the inner pipe 30b flowing through the hot water mixing valve 35 is set to, for example, about a set temperature + 5 ° C. That is, the flow rate circulating in the circulation circuit 11 and the hot water temperature of the heat storage fluid detected by the thermistor 54 before heat exchange are controlled. The hot water supply mixing valve 35 performs feedback control based on the hot water temperature of hot water supply water detected by the hot water supply thermistor 53.

  Here, the components of the tracking function will be described. First, the circulation circuit 11a distributes the heat storage fluid in the hot water storage tank 10 to the outer pipe 60a of the reheating heat exchanger 60 to be described later, and the heat storage fluid exchanged by the reheating heat exchanger 60 is used. It is a circulation circuit for returning between the upper part 10d and the lower part 10e in the hot water storage tank 10, and comprises a high temperature take-out pipe 12, an outgoing pipe 14a, a return pipe 15a, and a second circulation pump 17a.

  The upstream pipe 14 a has an upstream end connected to the middle of the high temperature extraction pipe 12 and a downstream end connected to the upstream end of the outer pipe 60 a of the reheating heat exchanger 60. The return pipe 15 a has an upstream end connected to the upstream end of the outer pipe 60 a and a downstream end connected to the central portion 10 f with respect to the height direction in the hot water storage tank 10. Further, the second circulation pump 17a is arranged in the middle of the return pipe 15a, and is a pump for circulating the heat storage fluid in the hot water storage tank 10 to the reheating heat exchanger 60.

  And it connects electrically to the hot water supply control part 41 mentioned later so that a rotation speed may be controlled based on the reheating temperature detected by the reheating thermistor 71 mentioned later. Incidentally, the flow rate of the high-temperature heat storage fluid to be distributed to the reheating heat exchanger 60 is adjusted by controlling the rotation speed of the second circulation pump 17a so that the reheating temperature does not exceed an abnormally high temperature (for example, 60 ° C.). doing.

  Next, the reheating heat exchanger 60 has the same configuration as the hot water supply heat exchanger 30 described above, and is connected to the circulation circuit 11a so that the heat storage fluid in the hot water storage tank 10 flows through the primary side passage 60A. And a secondary side passage 60B connected to the bath water circulation circuit 61. For example, as shown in FIG. 2, a second side passage 60B is formed in the outer pipe 60a, which is a third circulation portion forming the primary side passage 60A. This is a double-pipe structure through which an inner pipe 60b, which is a fourth flow section forming the secondary passage 60B, is inserted. Here, it is desirable to use a resin material for the outer tube 60a to keep heat loss low, and to use a copper material with a high thermal conductivity for the inner tube 60b.

  The inner tube 60b may be a cylindrical tube as with the outer tube 60a. For example, as shown in FIG. 2, the wall surface may be provided with a concavo-convex shape in the radial direction. In this case, the heat transfer area between the primary side passage 60A and the secondary side passage 60B increases, and the heat exchange efficiency between the heat storage fluid and the bath water can be improved. In addition, 60c shown in the figure is a heat insulating material for preventing heat dissipation of the heat storage fluid.

  As shown in FIG. 1, the reheating heat exchanger 60 is vertically disposed outside the hot water storage tank 10, and the downstream end of the outer pipe 60 a (primary side passage 60 </ b> A) is the central portion 10 f of the hot water storage tank 10. Is connected to the return pipe 15a so that the upstream end of the outer pipe 60a (primary side passage 60A) is connected to the high temperature take-out pipe 12 via the forward pipe 14a.

  The inner pipe 60b (secondary passage 60B) is connected to the bath water circulation circuit 61. Accordingly, the reheating heat exchanger 60 flows in the direction of the heat storage fluid flowing from the top to the bottom in the outer tube 60a and from the bottom to the top in the inner tube 60b, as indicated by arrows in FIG. This is a counter-flow heat exchanger facing the bath water flow direction.

  Next, the bath water circulation circuit 61 heat-exchanges in the forward pipe 62 and the inner pipe 60b (secondary side passage 60B) that guide the bath water in the bathtub to the upstream end of the inner pipe 60b (secondary side passage 60B). It is composed of a return pipe 63 and a bypass pipe 64 that guide water into the bathtub. The forward pipe 62 is provided with a water pressure switch 65, an on-off valve 66, a third circulation pump 67, a bath water temperature thermistor 68, a running water switch 69, and a reheating three-way valve 70 in order from the upstream side. Further, the return pipe 63 is provided with a recirculating thermistor 71 on the downstream side.

  The water pressure switch 65 is a sensor that detects the amount of hot water in the bathtub filled with hot water, in other words, the water pressure for determining the water level in the bathtub. The on-off valve 66 is an electromagnetic valve that opens and closes the bath water circulation circuit 61, and the third circulation pump 67 is an electric pump that pumps the bath water in the bathtub to the reheating heat exchanger 60. The bath water temperature thermistor 68 is a water temperature sensor that detects the hot water temperature of the bath water flowing through the forward pipe 62.

  The flowing water switch 69 is a flowing water sensor for detecting whether or not bath water and hot water supply water to be described later are circulating in the direction of the reheating three-way valve 70. The reheating three-way valve 70 is a switching valve for switching the flow direction to either one of the bypass pipe 64 that causes the bath water to flow to the reheating heat exchanger 60 or bypasses the reheating heat exchanger 60. . The reheating thermistor 71 is a water temperature sensor that detects the temperature of the bath water flowing through the return pipe 63, and is the bath water temperature that is returned into the bathtub.

  The water pressure switch 65, the flowing water switch 69, the bath water temperature thermistor 68, and the reheating thermistor 71 are configured to output volume information, flowing water information, and temperature information to the hot water supply control unit 41, which will be described later. The three-circulation pump 67 and the reheating three-way valve 70 are controlled by a hot water supply control unit 41 described later. In addition, when detecting the temperature of the bath water in the bathtub after filling with hot water, the flow direction of the reheating three-way valve 70 is switched to the bypass pipe 64 side and the third circulation pump 67 is operated, so that the bath in the bathtub is operated. Water is circulated in the order of the forward pipe 62, the bypass pipe 64, the return pipe 63, and the bathtub, and the hot water temperature of the bath water is detected by the bath water temperature thermistor 68.

  Further, when reheating, the flow direction of the reflowing three-way valve 70 is switched to the reheating heat exchanger 60 side, so that the bath water in the bathtub flows in the forward pipe 62, the reheating heat exchanger 60, and the return pipe. It is circulated in the order of 63 and in the bathtub, and is controlled to circulate until the hot water temperature of the bath water detected by the bath water temperature thermistor 68 reaches a predetermined temperature.

  Next, the components in the hot water filling function will be described. This hot water filling function is to mix hot water and tap water through the hot water supply pipes 32a and 33a and discharge to the bathtub, so that hot water and hot water including hot water can be poured. Yes. Specifically, hot water supply pipes 32 a and 33 a branched from the hot water supply pipe 32 are connected to a branch point 62 a provided in the bath water circulation circuit 61.

  A hot water filling mixing valve 35a, which is a hot water temperature adjusting means, is provided at the junction of the downstream end of the hot water supply piping 32a and the water supply piping 31, and a hot water supply piping 33a is provided on the outlet side of the hot water filling mixing valve 35a. It is connected. The hot water supply pipe 33a is provided with a hot water supply hot water supply thermistor 53a, a hot water supply open / close valve 57, a hot water supply flow rate counter 58a, and a check valve 59 in this order from the upstream side.

  The hot water filling mixing valve 35a is a temperature adjustment valve that adjusts the hot water temperature of hot water to be discharged from the hot water supply pipe 33a in the same manner as the hot water supply mixing valve 35 described above, and adjusts the respective opening area ratios. Thus, the mixing ratio between the hot water supply water and the tap water exchanged by the inner pipe 30b is adjusted to be adjusted to the set temperature. Furthermore, the hot water filling mixing valve 3a is electrically connected to a hot water supply control unit 41 described later, and hot water supply water detected by the above-described hot water supply thermistor 51, the post-heat exchange thermistor 52, and the hot water hot water supply thermistor 53a. It is controlled based on the temperature information.

  The hot water filling on / off valve 57 is an electromagnetic valve that is controlled by a hot water supply control unit 41 described later and opens and closes the mixed hot water flowing through the hot water supply pipe 33a. The hot water flow rate counter 58a detects the flow rate of the mixed hot water flowing through the hot water supply pipe 33a, and outputs the flow rate information detected by the hot water flow rate counter 58a to the hot water supply control unit 41 described later. Yes. The check valve 59 is a valve for preventing the bath water in the bath water circulation circuit 61 from flowing into the hot water supply pipe 33a.

  When the hot water filling on / off valve 57 is opened to fill the bathtub with hot water, hot water, or hot water, the on / off valve 66 is also controlled to be opened and detected by the water pressure switch 65. When the water level reaches a predetermined level, the hot water on / off valve 57 and the on / off valve 66 are closed, and the set hot water is filled in the bathtub. Further, the hot water and the hot water are controlled so that the mixed hot water having a predetermined flow rate is discharged based on the flow rate information detected by the hot water filling flow rate counter 58a.

  Next, the hot water supply control unit 41 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program, and the thermistors 51 to 55, 53a, 68, 71, based on temperature information from 71, flow information from each flow counter 58, 58a, operation signal from an operation switch provided on an operation panel (not shown), etc., in circulation circuits 11, 11a, in bath water circulation circuit 61, hot water supply It is comprised so that the various actuators in the piping 32, 32a, 33, 33a for work may be controlled.

  Similarly to the hot water supply control unit 41, the heat source control unit 42 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program, not shown. The actuators in the heat pump unit 20 are controlled based on temperature information from various thermistors. In this heat source control unit 42, a hot water storage thermistor (the uppermost part) that detects the temperature of the heat storage fluid after heating in order to keep the hot water temperature of the heat storage fluid heated by the heat storage heat exchanger (not shown) at a constant temperature. Based on the detected temperature 55, the rotational speed of an electric pump (not shown) is controlled.

  In the present embodiment, in the circulation circuit 11, one intermediate temperature take-out pipe 13 is provided between the upper part 10d and the lower part 10e in the hot water storage tank 10, but not limited to this, as shown in FIG. A plurality of medium temperature take-out pipes 13 may be provided, and a switching valve 19 for selecting any one of them may be provided. According to this, of the heat storage fluid stored in the hot water storage tank 10, the medium temperature heat storage fluid can be easily detected and taken out.

  Next, the operation of the hot water storage type hot water supply apparatus having the above configuration will be described. First, when a power switch (not shown) is turned on, for example, when a midnight time zone is reached, the heat source control unit 42 causes the heat pump cycle parts (not shown) in the heat pump unit 20 and actuators such as an electric pump (not shown) to be connected. The heat storage fluid in the hot water storage tank 10 is controlled to be heated, and a high temperature (for example, 85 ° C.) heat storage fluid is stored.

  Then, using the stored high-temperature heat storage fluid as a heat source, the hot-water supply heat exchanged by the hot-water supply heat exchanger 30 and tap water are mixed to supply hot water to a hot water supply target location such as a kitchen, washroom, and bathtub. The bath water is repelled by the reheating heat exchanger 60. By the way, in the hot water storage type hot water supply apparatus of the present embodiment, the operation of each component is different between when the hot water supply is used and when the hot water is used, so as an example for hot water use, Next, the operation when chasing the bath water will be described.

  First, when hot water is filled in the bathtub, by operating a hot water switch (not shown), the hot water controller 41 opens the hot water on / off valve 57 and the on / off valve 66, and The first circulation pump 17 operates. When the first circulation pump 17 is operated, the heat storage fluid in the hot water storage tank 10 is circulated to the primary side passage 30A (outer pipe 30a) of the hot water supply heat exchanger 30. Thereby, the hot water supply water flowing through the secondary side passage 30B (inner pipe 30b) of the hot water supply heat exchanger 30 receives the heat energy of the heat storage fluid and is heated.

  Here, the hot water supply control unit 41 drives the first circulation pump 17 so that the hot water temperature detected by the thermistor 52 after heat exchange becomes a predetermined temperature (for example, about a set temperature + 5 ° C.). ) To control. That is, when the hot water temperature detected by the thermistor 52 after heat exchange is lower than a predetermined temperature (for example, about the set temperature + 5 ° C.), the rotation speed of the first circulation pump 17 is increased to increase the primary side passage 30A (outer pipe 30a). ) To increase the circulation rate of the heat storage fluid flowing through.

  This increases the amount of heat exchange between the heat storage fluid flowing through the primary side passage 30A (outer pipe 30a) and the hot water supply water flowing through the secondary side passage 30B (inner pipe 30b), so the hot water temperature of the hot water supply rises. .

  Conversely, when the hot water temperature detected by the thermistor 52 after heat exchange is higher than a predetermined temperature (for example, about the set temperature + 5 ° C.), the rotation speed of the first circulation pump 17 is reduced to reduce the primary side passage 30A ( The circulation amount of the heat storage fluid flowing through the outer pipe 30a) is reduced. As a result, the amount of heat exchange between the heat storage fluid flowing through the primary side passage 30A (outer pipe 30a) and the hot water supply water flowing through the secondary side passage 30B (inner pipe 30b) is reduced, and the hot water temperature of the hot water supply rises. .

  At this time, the high / medium temperature mixing valve 16 controls the hot water temperature of the heat storage fluid detected by the thermistor 54 before heat exchange to be equal to or higher than a predetermined temperature. Specifically, when the hot water temperature of the heat storage fluid in the hot water storage tank 10 detected by the hot water storage thermistor 55 is lower than a predetermined temperature (for example, 30 ° C.), the hot water temperature is higher than the predetermined temperature extracted from the high temperature extraction pipe 12. The heat storage fluid is controlled to flow through the primary passage 30A (outer pipe 30a).

  On the other hand, when the hot water temperature of the heat storage fluid in the hot water storage tank 10 detected by the hot water storage thermistor 55 is equal to or higher than a predetermined temperature (for example, 30 ° C.), the medium temperature heat storage fluid taken out from the intermediate temperature take-out pipe 13 or the medium temperature take-out The primary side passage 30A (outer pipe 30a) is mixed with both the medium-temperature heat storage fluid taken out from the pipe 13 and the high-temperature heat storage fluid taken out from the high-temperature take-out pipe 12 so that the hot water storage fluid having a predetermined temperature or higher is mixed. It is controlled to circulate.

  As a result, a large amount of medium-temperature heat storage fluid is circulated through the primary passage 30A (outer pipe 30a), so that the low-temperature heat storage fluid is returned to the lower portion 10e in the hot water storage tank 10 (for example, about the water supply temperature + 5 ° C.). Will be.

  At this time, when the circulation of the medium temperature heat storage fluid is small, the temperature becomes higher than that of the low temperature heat storage fluid and returned to the hot water storage tank 10, but the heat storage fluid returned to the hot water storage tank 10 is returned. Over time, due to the difference in specific gravity of the heat storage fluid, a high temperature is formed upward, a low temperature is formed below, and an intermediate layer (medium temperature) is formed between the upper and lower portions.

  On the other hand, in the hot water filling mixing valve 35a, hot water supply water having a predetermined temperature (set temperature + 5 ° C.) exchanged in the secondary passage 30B (inner pipe 30b) and water supplied from the water supply pipe 31 are provided. Hot-water supply water that has been mixed and adjusted to the set temperature is discharged into the bathtub through the forward pipe 62. When the water level in the bath reaches a preset water level, the water pressure switch 65 detects the water level to close the hot water on-off valve 57 and complete the predetermined amount of hot water filling. It is.

  Next, the operation for chasing the bath water in the bathtub will be described. When the reheating switch (not shown) is operated, the bath water temperature is detected every predetermined time, and if the bath water temperature does not reach the reheating set temperature, the bath water is heated. To do. That is, the hot water control unit 41 activates the follow-up three-way valve 70, the on-off valve 66, and the third circulation pump 67 after a predetermined time, and circulates the bath water in the bathtub in the order of the forward pipe 62, the bypass pipe 64, and the return pipe 63. Let

  At this time, the bath water temperature is detected by the bath water temperature thermistor 68. When the detected bath water temperature is equal to or lower than the reheating set temperature, the flow direction of the reheating three-way valve 70 is switched to the reheating heat exchanger 60 side, and the bath water is circulated to the reheating heat exchanger 60. Thereby, bath water receives the heat energy of the fluid for thermal storage, and is heated. When the bath water temperature reaches the set temperature, the flow direction of the follow-up three-way valve 70 is switched to the bypass pipe 64 side, the on-off valve 66 is closed, and the third circulation pump 67 is stopped. Thus, the bath water is kept warm so as to maintain the set temperature.

  By reheating the bath water, the heat storage fluid having a substantially middle temperature similar to the bath water temperature is returned from the reheating heat exchanger 60 to the hot water storage tank 10 through the return pipe 15a. Then, the hot water supply water that has been subjected to heat exchange by taking out the intermediate temperature storage fluid from the intermediate temperature extraction pipe 13 is discharged from the hot water supply pipes 33 and 33a, so that the lower portion 10e in the hot water storage tank 10 has a low temperature (for example, about the supply water temperature + 5 ° C.). ) Of the heat storage fluid is returned.

  According to the hot water storage type hot water supply apparatus of the first embodiment described above, when the bath water is replenished by the reheating heat exchanger 60, the heat storage fluid having a substantially medium temperature with a low heat exchanged temperature is increased. The high temperature extraction pipe 12 for extracting the high temperature heat storage fluid and the intermediate temperature extraction pipe 13 for extracting the medium temperature heat storage fluid are provided, and the heat storage fluid heat exchanged in the reheating heat exchanger 60 is the medium temperature extraction pipe. 13 and further configured to circulate the medium temperature heat storage fluid in the primary passage 30A (outer pipe 30a), thereby actively consuming the medium temperature heat storage fluid, Furthermore, since the hot water storage fluid having a temperature lower than that of the intermediate temperature storage fluid can be returned to the hot water storage tank 10, the operating efficiency of the heat pump unit 20 during the boiling operation is low. There can be prevented.

  Further, the reheating heat exchanger 60 is configured as a counterflow type heat exchanger, and further, the downstream end of the primary side passage 60A (outer tube 60a) is extracted to the intermediate temperature extraction pipe 13. The heat storage fluid after passing through the primary side passage 60A (outer pipe 60a) is lowered to about the hot water temperature of the bath water before heat exchange. When consumed by the exchanger 30, the heat storage fluid having a hot water temperature lower than the intermediate temperature can be returned to the hot water storage tank 10. Thereby, the fall of the operating efficiency of the heating means (20) at the time of boiling operation can be prevented.

  In addition, a plurality of hot water storage thermistors 55 are provided in the vicinity of the upstream end of the intermediate temperature take-out pipe 13, that is, the hot water storage tank 10, and the hot water supply heat exchanger 30 has a hot water temperature detected by the hot water storage thermistors 55 lower than a predetermined temperature. The high-temperature heat storage fluid taken out from the high-temperature take-out pipe 12 is circulated through the primary passage 30A (outer pipe 30a) and taken out from the intermediate-temperature take-out pipe 13 when the hot water temperature detected by the hot water storage thermistor 55 is equal to or higher than a predetermined temperature. The medium-temperature heat storage fluid or the medium-temperature heat storage fluid taken out from the medium-temperature take-out pipe 13 and the high-temperature heat storage fluid taken out from the high-temperature take-out pipe 12 are circulated through the primary passage 30A (outer pipe 30a). By constructing, among the heat storage fluid stored in the hot water storage tank 10, the medium temperature heat storage fluid is actively taken. The temperature reduced hot water temperature of the heat storage fluid it is Succoth can be returned to the hot water storage tank 10. Thereby, the storage of the heat storage fluid having an intermediate temperature or less becomes large, and a decrease in the operation efficiency of the heat pump unit 20 during the boiling operation can be prevented.

  Further, a high / intermediate temperature mixing valve 16 for adjusting the flow rate ratio is provided at a downstream side joining portion of the high temperature extraction pipe 12 and the intermediate temperature extraction pipe 13, and the high / intermediate temperature mixing valve 16 is a hot water detected by the hot water storage thermistor 55. When the temperature is equal to or higher than a predetermined temperature, the medium-temperature heat storage fluid taken out from the medium-temperature take-out pipe 13 or the medium-temperature heat storage fluid taken out from the medium-temperature take-out pipe 13 and the high-temperature heat storage fluid taken out from the high-temperature take-out pipe 12 By adjusting both to flow through the primary passage 30A (outer pipe 30a), among the heat storage fluid stored in the hot water storage tank 10, medium temperature heat storage fluid can be actively taken out. It is possible to easily return the hot water storage fluid having the lowered temperature to the hot water storage tank 10.

  Further, a thermistor 54 before heat exchange for detecting the hot water temperature of the intermediate temperature storage fluid extracted from the intermediate temperature extraction pipe 13 flowing through the primary side passage 30A (outer pipe 30a) is provided. By adjusting the hot water temperature detected by the pre-replacement thermistor 54 to be equal to or higher than a predetermined temperature, the hot water supply water downstream of the secondary side passage 30B (inner pipe 30b) is changed to a predetermined temperature (for example, about a set temperature + 5 ° C.). ) Can be secured.

  Further, as shown in FIG. 3, at least two or more intermediate temperature take-out pipes 13 are provided, and one of the medium temperature heat storage fluids is selected as the intermediate temperature extraction pipe 13 to the primary side passage 30A (outer pipe 30a). By being configured to circulate, the portion where the intermediate temperature heat storage fluid is stored is not uniform in the vertical direction of the hot water storage tank 10, and thus a plurality of intermediate temperature extraction pipes 13 are provided, so that it is accurate and positive. In addition, medium temperature heat storage fluid can be positively removed.

  Further, on the downstream side of the secondary side passage 30B (inner pipe 30b), a hot water supply mixing valve 35 for adjusting the temperature of the hot water supply water by mixing the hot water supplied by the hot water supply heat exchanger 30 with tap water. Is provided for hot water supply even when the hot water temperature changes slightly due to overshoot at the time of transition immediately after the hot water supply or due to fluctuations in the flow rate of the hot water during steady hot water supply. By mixing and adjusting the hot water temperature again with tap water using the mixing valve 35, fluctuations in the hot water temperature resulting therefrom can be easily absorbed, and the temperature control of the hot water is accurately controlled with respect to the set temperature. be able to.

  Further, the heat pump unit 20 is a supercritical heat pump in which the high-pressure side pressure of the refrigerant is equal to or higher than the critical pressure, and in the supercritical heat pump cycle, the heat storage fluid is heated by heating the heat storage fluid with the refrigerant whose pressure is increased to the critical pressure or higher. When the working fluid is heated to a target temperature (for example, 65 to 90 ° C.), the lower the hot water temperature of the heat storage fluid before heating, the lower the high pressure, resulting in cycle efficiency (COP = heating capacity / power consumption). improves. Therefore, by heating the heat storage fluid that has been reduced to the vicinity of the temperature of the hot water supply water before heating in the supercritical heat pump cycle, cycle efficiency can be improved and power saving operation can be performed.

(Second Embodiment)
In the first embodiment described above, the high / medium temperature mixing valve 16 that is a flow rate adjusting means for adjusting the flow rate ratio is provided at the downstream side joining portion of the high temperature extraction pipe 12 and the intermediate temperature extraction pipe 13. Alternatively, the intermediate temperature extraction pipe 13 may be provided with a flow rate adjustment valve 16 a serving as a first flow rate adjusting unit, and the downstream end of the intermediate temperature extraction pipe 13 may be joined to the downstream side of the high temperature extraction pipe 12.

  Specifically, as shown in FIG. 4, a flow rate adjusting valve 16 a is provided in the intermediate temperature extraction pipe 13 instead of the high and intermediate temperature mixing valve 16, and the flow rate adjusting valve 16 a is controlled by the hot water supply control unit 41. As in the first embodiment, when the hot water temperature detected by the hot water storage thermistor 55 is lower than a predetermined temperature, the high-temperature heat storage fluid taken out from the high-temperature take-out pipe 12 is circulated through the primary passage 30A (outer pipe 30a). When the hot water temperature detected by the hot water storage thermistor 55 is equal to or higher than a predetermined temperature, the medium temperature heat storage fluid extracted from the intermediate temperature extraction pipe 13 or the medium temperature heat storage fluid extracted from the intermediate temperature extraction pipe 13 and the high temperature extraction pipe 12 are used. Control is performed so that both the taken-out high-temperature heat storage fluid flows through the primary passage 30A (outer pipe 30a).

  According to the hot water storage device of the second embodiment described above, as in the first embodiment, among the heat storage fluids stored in the hot water storage tank 10 by the hot water storage thermistor 55 and the flow rate control valve 16a, the medium temperature heat storage device is used. It is possible to positively take out the fluid and to easily return the hot water storage fluid having a lowered temperature to the hot water storage tank 10. Accordingly, it is possible to prevent a decrease in operating efficiency of the heat pump unit 20 during the boiling operation.

(Third embodiment)
In the above embodiment, the downstream end of the primary side passage 60A (outer pipe 60a) of the reheating heat exchanger 60 is configured at the central portion of the hot water storage tank 10 from which the intermediate temperature storage fluid is taken out by the intermediate temperature extraction pipe 13, Furthermore, the circulation circuit 11 is configured so that the medium-temperature heat storage fluid flows through the upstream end of the primary passage 30A (outer pipe 30a) of the hot water supply heat exchanger 30, but the present invention is not limited thereto. The high temperature extraction pipe 12 is connected to the upstream end of the primary side passage 30A (outer pipe 30a), and the downstream end of the intermediate temperature extraction pipe 13 is connected to the middle of the primary side passage 30A (outer pipe 30a). Either the heat storage fluid exchanged by the reheating heat exchanger 60 is returned to the hot water storage tank 10 or is circulated through the primary passage 30A (outer pipe 30a) of the hot water supply heat exchanger 30. One may be configured to choose.

  Specifically, as shown in FIG. 5, the circulation circuit 11 of the hot water supply heat exchanger 30 is connected to the upstream end of the primary side passage 30A (outer pipe 30a) with a high temperature extraction pipe 12, and the primary side passage 30A (outside In the middle of the pipe 30a), the downstream end of the intermediate temperature extraction pipe 13 is connected, and a flow rate adjusting valve 16c for adjusting the flow ratio is provided at a branch portion between the high temperature extraction pipe 12 and the forward pipe 14, A second circulation pump 17a and a three-way valve 16d for switching the flow direction are provided on the upstream side of the intermediate temperature extraction pipe 13 and further on the downstream side thereof. Further, the primary side passage 60A of the reheating heat exchanger 60 is provided on one of the flow rate control valves 16c. (Outer pipe 60a) is connected so that the upstream end communicates, and one of the three-way valves 16d is connected so as to communicate with the downstream end of the primary passage 60A (outer pipe 60a) of the reheating heat exchanger 60. That. Reference numeral 54a denotes a thermistor prior to medium temperature heat exchange, which is a water temperature sensor that detects the hot water temperature of the medium temperature heat storage fluid flowing through the primary passage 30A (outer pipe 30a).

  The flow rate ratio adjustment valve 16c is a valve that adjusts the flow rate ratio of the heat storage fluid to be circulated through the hot water supply heat exchanger 30 and the reheating heat exchanger 60, and when hot water is discharged from the hot water supply pipes 33 and 33a, The total flow rate of the high-temperature heat storage fluid flows to the hot water supply heat exchanger 30 side, and when the bath water is replenished, the total flow rate flows to the recuperation heat exchanger 60, and hot water supply is performed when reheating. When this happens, heat storage fluid flows through both.

  Similarly to the above, the three-way valve 16d communicates the hot water in the hot water storage tank 10 and the primary passage 30A (outer pipe 30a) side of the hot water supply heat exchanger 30 when hot water is supplied. Sometimes the inside of the hot water storage tank 10 communicates with the reheating heat exchanger 60 primary side passage 60A (outer pipe 60a), and reheating heat exchange is performed when hot water is supplied while reheating. The hot water supply controller 41 controls the primary side passage 60A (outer pipe 60a) of the water heater 60 and the primary side passage 30A (outer pipe 30a) side of the hot water supply heat exchanger 30 to communicate with each other.

  According to the hot water storage type hot water supply apparatus of the third embodiment described above, the middle of the primary side passage 30A (outer pipe 30a) is connected to the downstream side of the intermediate temperature takeout pipe 13, whereby the primary side passage 30A (outer pipe 30a). In the middle and downstream, the upstream side of the secondary side passage 30B (inner pipe 30b) through which hot water supply water circulates and the medium temperature heat storage fluid are heat-exchanged. The hot heat storage fluid can be returned to the hot water storage tank 10.

  In addition, when hot water is supplied while reheating, the medium temperature heat storage fluid is returned by reheating the bath water, but this medium temperature heat storage fluid may be consumed on the hot water supply heat exchanger 30 side. In addition, since the heat storage fluid of the hot water whose temperature has decreased can be returned to the hot water storage tank 10, the same effects as those of the above embodiment can be obtained.

  Further, the thermistor 54a before the medium temperature heat exchange in the present embodiment adjusts the hot water temperature of the medium temperature heat storage fluid flowing through the primary side passage 30A (outer pipe 30a) by the flow rate control valve 16c so as not to exceed a predetermined temperature. good. Thereby, the hot water temperature (return pipe 15) of the heat storage fluid after heat exchange can be controlled so as not to exceed a predetermined temperature. Therefore, the hot water temperature of the heat storage fluid returned to the lower portion 10e in the hot water storage tank 10 is controlled so as not to increase. In the present embodiment, the hot water supply heat exchanger 30 is integrally formed, but may be a separate body.

(Fourth embodiment)
In the above embodiment, the reheating heat exchanger 60 is disposed outside the hot water storage tank 10. However, the present invention is not limited thereto, and specifically, as shown in FIG. The reheating heat exchanger 60 is constituted by piping, and the heat exchanger 36 is accommodated above the hot water storage tank 10. According to this, although the temperature layer of the medium temperature heat storage fluid increases in the hot water storage tank 10, parts such as the circulation circuit 11a and the second circulation pump 17a can be reduced. This reduces the component cost.

  In addition, in this embodiment, although the circulation circuit 11 was comprised by 1st Embodiment, as shown in FIG. 7, as with 3rd Embodiment, the primary side channel | path 30A (outside of the hot water supply heat exchanger 30 is shown. The high temperature extraction pipe 12 may be connected to the upstream end of the pipe 30a), and the downstream end of the intermediate temperature extraction pipe 13 may be connected to the middle of the primary passage 30A (outer pipe 30a). According to this, parts, such as the circulation circuit 11a, the 2nd circulation pump 17a, and the three-way valve 16d, can be reduced rather than 3rd Embodiment.

(Other embodiments)
In the above embodiment, the heat pump unit 20 using carbon dioxide as a refrigerant has been described as a heat source device. However, the present invention is not limited to this, and a general heat pump cycle using a refrigerant such as chlorofluorocarbon or alternative chlorofluorocarbon may be used.

  Moreover, in the above embodiment, the hot water storage tank 10 does not necessarily need to use a resin material, and may be shape | molded with a metal material. Moreover, the shape of the hot water storage tank 10 may not be a rectangular parallelepiped shape but may be a cylindrical shape, for example. In addition, although the hot water storage tank 10 is formed in an open air type, a hot water storage tank having a sealed type structure may be used. In this case, however, parts for protecting the tank such as a pressure reducing valve and a pressure relief valve are required.

  Moreover, in the above embodiment, the secondary side passage 30B (inner side tube 30b) is provided inside the primary side passage 30A (outer side tube 30a) of the hot water supply heat exchanger 30, but conversely, the primary side passage 30A The secondary side passage 30B may be provided outside. Moreover, the material used for the inner tube 30b and the outer tube 30a described above is an example. For example, the inner tube 30b can use aluminum having high thermal conductivity, and the outer tube 30a may be made of metal.

  Moreover, the heat exchanger 30 for hot water supply is not limited to the double pipe structure which consists of the inner side pipe | tube 30b and the outer side pipe | tube 30a, but as shown in FIG. 8, the primary side channel | path which has several distribution | circulation part 30A, 30B You may comprise with the counterflow type heat exchanger which joined 30a (outer pipe | tube 30a) and the secondary side channel | path 30b (inner pipe | tube 30b). Furthermore, a similar structure may be formed from a metal plate. The reheating heat exchanger 60 may have the same configuration as the above-described hot water supply heat exchanger 30.

It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 1st Embodiment of this invention. It is sectional drawing which shows the cross-sectional shape of the outer side pipe | tube and inner side pipe | tube which comprise the heat exchanger 30 for hot water supply in the 1st Embodiment of this invention, and the reheating heat exchanger. It is a schematic diagram which shows the whole structure of the hot water storage type hot-water supply apparatus in the modification of 1st Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 2nd Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 3rd Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 4th Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in the modification of 4th Embodiment of this invention. It is sectional drawing which shows the cross-sectional shape of the 1st distribution part and the 2nd distribution part which comprise the heat exchanger 30 for hot water supply in other embodiment. It is a schematic diagram which shows the whole structure of the hot water storage type hot-water supply apparatus in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Hot water storage tank 12 ... High temperature extraction piping 13 ... Medium temperature extraction piping 16 ... High / medium temperature mixing valve (flow rate adjustment means)
16a ... Flow control valve (first flow control means)
20 ... Heat pump unit (heating means)
21 ... Flow path for fluid heating 30 ... Heat exchanger for hot water supply 30a ... Outer pipe (first flow section)
30b ... Inner pipe (second circulation part)
35 ... Hot water mixing valve (hot water temperature control means)
54 ... Thermistor before heat exchange (Water temperature sensor before heat exchange)
55 ... Hot water storage thermistor (water temperature sensor)
60 ... Reheating heat exchanger 60a ... Outer pipe (third distribution section)
60b ... Inner pipe (fourth distribution section)

Claims (12)

A hot water storage tank (10) for storing heat storage fluid therein;
A fluid heating flow path (21) for sending the lowest heat storage fluid in the hot water storage tank (10) to the uppermost part in the hot water storage tank (10);
A heating means (20) provided in the fluid heating channel (21) for heating the heat storage fluid flowing through the fluid heating channel (21);
A first circulation part (30a) through which heat storage fluid in the hot water storage tank (10) circulates and a second circulation part (30b) through which hot water supply circulates are provided adjacent to each other, and the heat storage fluid and hot water supply water are provided. In a hot water storage type hot water supply apparatus comprising a hot water supply heat exchanger (30) for performing heat exchange between the two,
A reheating heat exchanger (60) for exchanging heat between the heat storage fluid in the hot water storage tank (10) and the bath water in the bathtub is provided,
The hot water supply heat exchanger (30) is configured such that a downstream end of the first circulation part (30a) communicates with a lower part of the hot water storage tank (10), and is heated by the heating means (20). Among the heat storage fluid stored in the hot water storage tank (10), the medium temperature storage heat storage fluid includes a high-temperature heat storage fluid or a heat storage fluid heat-exchanged by the reheating heat exchanger (60). A hot water storage type hot water supply apparatus configured to circulate a fluid or a high-temperature and medium-temperature heat storage fluid to the first circulation part (30a). The hot water storage tank (10) is provided with a high temperature extraction pipe (12) for extracting a high temperature heat storage fluid and a medium temperature extraction pipe (13) for extracting an intermediate temperature heat storage fluid,
The reheating heat exchanger (60) is configured such that the heat-exchanged heat storage fluid is extracted to the intermediate temperature extraction pipe (13), and the hot water supply heat exchanger (30) is the high temperature A high-temperature heat storage fluid taken out from the take-out pipe (12), or a high-temperature heat storage fluid taken out from the high-temperature take-out pipe (12) and an intermediate temperature heat storage fluid taken out from the intermediate-temperature take-out pipe (13) It is comprised so that it may distribute | circulate to the said 1st distribution part (30a), The hot water storage type hot-water supply apparatus of Claim 1 characterized by the above-mentioned.   In the hot water supply heat exchanger (30), the upstream end of the first circulation part (30a) is connected to the downstream side of the high-temperature take-out pipe (12), and the middle of the first circulation part (30a) Is connected to the downstream side of the intermediate temperature extraction pipe (13).   The reheating heat exchanger (60) includes a third circulation part (60a) through which heat storage fluid in the hot water storage tank (10) circulates and a fourth circulation part (60b) through which bath water in the bathtub circulates. ) And the heat storage fluid and the bath water in the bathtub are opposed to each other, and the upstream end of the third circulation part (60a) is connected to the high temperature take-out pipe (12 The hot water storage system according to claim 2 or 3, wherein a downstream end of the third circulation part (60a) is extracted to the intermediate temperature extraction pipe (13). Hot water supply device.   The reheating heat exchanger (60) is disposed above the hot water storage tank (10), and both of the heat storage fluid in the hot water storage tank (10) and the bath water in the bathtub flowing inside. The hot water storage type hot water supply apparatus according to claim 2 or 3, wherein the hot water storage apparatus is configured to perform heat exchange. A water temperature sensor (55) for detecting the hot water temperature of the heat storage fluid is provided in the vicinity of the upstream end of the intermediate temperature extraction pipe (13),
The hot water supply heat exchanger (30) supplies the high temperature heat storage fluid taken out from the high temperature extraction pipe (12) when the hot water temperature detected by the water temperature sensor (55) is lower than a predetermined temperature. When the hot water temperature detected by the water temperature sensor (55) is equal to or higher than a predetermined temperature, the medium temperature heat storage fluid taken out from the intermediate temperature takeout pipe (13) or the intermediate temperature takeout pipe ( 13) The medium-temperature heat storage fluid taken out from 13) and the high-temperature heat storage fluid taken out from the high-temperature take-out pipe (12) are both circulated to the first flow part (30a). The hot water storage type hot water supply apparatus according to any one of claims 2 to 5. Flow rate ratio adjusting means (16) for adjusting the respective flow rate ratios is provided at the downstream side joining portion of the high temperature take-out pipe (12) and the intermediate temperature take-out pipe (13),
When the hot water temperature detected by the water temperature sensor (55) is equal to or higher than a predetermined temperature, the flow rate ratio adjusting means (16) is an intermediate temperature storage fluid that is taken out from the intermediate temperature take-out pipe (13), or the intermediate temperature take-out Adjustment was made so that both the medium-temperature heat storage fluid taken out from the pipe (13) and the high-temperature heat storage fluid taken out from the high-temperature take-out pipe (12) are circulated to the first circulation part (30a). The hot water storage type hot water supply apparatus according to claim 6. The intermediate temperature extraction pipe (13) is provided with first flow rate adjusting means (16a) for adjusting the flow rate of the medium temperature heat storage fluid flowing through the intermediate temperature extraction pipe (13).
When the hot water temperature detected by the water temperature sensor (55) is equal to or higher than a predetermined temperature, the first flow rate adjusting means (16a) is an intermediate temperature heat storage fluid taken out from the intermediate temperature take-out pipe (13), or the intermediate temperature. It was adjusted so that both the medium temperature storage fluid extracted from the extraction pipe (13) and the high temperature storage fluid extracted from the high temperature extraction pipe (12) could be circulated to the first circulation part (30a). The hot water storage type hot water supply apparatus according to claim 6.   The intermediate temperature take-out pipe (13) is provided with a plurality of at least two or more, and is configured to select any one of the medium temperature heat storage fluids and distribute it to the first circulation part (30a). The hot water storage type hot water supply apparatus according to any one of claims 2 to 8, wherein the hot water storage type hot water supply apparatus is provided.   A pre-heat exchange water temperature sensor (54) for detecting the hot water temperature of the medium temperature heat storage fluid taken out from the intermediate temperature take-out pipe (13) flowing through the first flow part (30a) is provided, and the flow rate ratio adjustment The means (16) or the first flow rate adjusting means (16a) is adjusted so that the hot water temperature detected by the pre-heat exchange water temperature sensor (54) is equal to or higher than a predetermined temperature. The hot water storage type hot water supply apparatus according to any one of claims 9 to 9.   On the downstream side of the second circulation section (30b), the hot water supply water before the hot water supply heat exchanger (30) exchanges heat with the hot water supply water heat exchanged by the hot water supply heat exchanger (30). The hot water storage type hot water supply apparatus according to any one of claims 1 to 10, further comprising a hot water supply temperature adjusting means (35) for adjusting the temperature of hot water supply water by mixing the water temperature.   The said heating means (20) is a supercritical heat pump cycle in which the high-pressure side pressure of the refrigerant is equal to or higher than the critical pressure, and heats the heat storage fluid with the refrigerant whose pressure is increased to the critical pressure or higher. The hot water storage type hot water supply apparatus according to any one of claims 11 to 11.

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