JP2011226695A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater that can efficiently operate at the simultaneous operation of boiling of water within a hot water storage tank and heating of water to be heated by using one circulation pump.SOLUTION: A first flow passage changeover unit 31 is a unit capable of selecting a first flow passage form wherein a first lower side of a hot water storage tank 10 and a boiling heat exchanger 60 are communicated with each other via a boiled-water circulation circuit and a second flow passage form wherein a heat source side flow passage and a boiling heat exchanger 60 are communicated with each other via the boiled-water circulation circuit. A second flow passage changeover unit 32 is a unit capable of selecting a first flow passage form wherein the boiling heat exchanger 60 and the upper side of the hot water storage tank 10 are communicated with each other via the boiled-water circulation circuit, a second flow passage form wherein the boiling heat exchanger 60 and a lower return flow passage are communicated with each other via the boiled-water circulation circuit, and a third flow passage form wherein the boiling heat exchanger 60 and a heating heat exchanger 22 are communicated with each other via the boiled-water circulation circuit, a bypass flow passage 47 and heat source side flow passages 45 and 46.

Description

  The present invention relates to a hot water storage type water heater.

  As a hot-water storage hot water supply system, a system that uses a single circulation pump to perform a heating operation to boil water in a hot water storage tank and a heating operation to heat water to be heated (tub water circulating water or circulating water for heating) is proposed. (For example, refer to Patent Document 1).

JP 2004-218907 A

  However, in the configuration of Patent Document 1, when the hot water is discharged to the hot water supply destination when the bath water reheating operation or the heating operation in the heating unit and the boiling operation are performed simultaneously, the water flows into the heating heat exchanger. The hot water is medium-temperature water (the hot water temperature is generally about 40 to 50 ° C.) after the bath water reheating operation is performed. In particular, in a heat pump type heat source device using a natural refrigerant, the smaller the temperature difference between the temperature of hot water led to the heating heat exchanger and the target boiling temperature (generally about 90 ° C.), the more efficient the operation (boiling). The efficiency calculated from the heating capacity of the heat pump with respect to the energy used for the heating operation of the heat pump such as raising) is reduced, so when medium-temperature water is heated with a heat exchanger for boiling, the operating efficiency is reduced. There is.

  This invention was made in order to solve the above-mentioned subject, and can perform the simultaneous operation of the boiling operation of the water in a hot water storage tank, and the heating operation of the heating object water using one circulation pump. In addition, an object of the present invention is to provide a hot water storage type water heater that does not cause a decrease in operation efficiency even when hot water is discharged during the simultaneous operation of the heating operation and the heating operation of the water to be heated.

  Use of a hot water storage tank, a heat exchanger for boiling water that heats the water in the hot water tank using heating means by a heat pump, and heat exchange between the hot water in the hot water tank and the predetermined heating target water Side heat exchanger, one end is connected to the upper part of the hot water storage tank, a heat exchanger for boiling is installed on the way, and the other end is connected to the first lower part of the hot water storage tank, and one end is boiled Connected between the upper part of the hot water storage tank in the raising water circulation circuit and the heat exchanger for boiling, the use side heat exchanger is installed in the middle, and the other end is heated up with the first lower part of the hot water tank in the boiling water circulation circuit A heat source side flow path that is connected to the heat exchanger for heat using the first flow path switching means and constitutes a flow path on the heat source side of the use side heat exchanger, and a heat source side flow path in the boiling water circulation circuit Heat exchange for heating up the connection with one end of the A second flow path switching means installed between the container, a lower return flow path connecting the second flow path switching means and the second lower part of the hot water storage tank, and a first flow path switching means in the boiling water circulation circuit And a circulating pump installed between the heating heat exchanger for boiling and one end of the circulation pump connected between the use side heat exchanger of the heat source side flow path and the first flow path switching means, and the other end of the circulation pump. The bypass flow path connected to the flow path switching means, one end is connected between the second flow path switching means in the boiling water circulation circuit and the upper part of the hot water storage tank, and the other end to the hot water outlet in the hot water storage tank And a first flow path switching means comprising: a first flow path configuration in which the first lower portion of the hot water storage tank and the heating heat exchanger communicate with each other via a boiling water circulation circuit; and a heat source A second flow path configuration in which the side flow path and the heating heat exchanger communicate with each other via a boiling water circulation circuit The second flow path switching means includes a first flow path configuration in which the boiling heat exchanger and the upper part of the hot water storage tank communicate with each other via a boiling water circulation circuit, and heating heat. The second flow path configuration in which the exchanger and the lower return flow path communicate with each other through the boiling water circulation circuit, the boiling heat exchanger and the heating heat exchanger are the boiling water circulation circuit, the bypass flow path, and the heat source side This is a means capable of selecting a third flow path form communicating through the flow path.

  According to the present invention, using one circulating pump, it is possible to simultaneously perform a heating operation of water in a hot water storage tank and a heating operation of heating target water, and a heating operation and a heating operation of heating target water. It is possible to provide a hot water storage type water heater that does not cause a decrease in operation efficiency even when hot water is discharged during the simultaneous operation.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the hot water storage type water heater which shows Embodiment 1 of this invention. It is a figure which shows the standby state of the hot water storage type water heater of Embodiment 1. FIG. It is a figure which shows the time of the boiling independent operation | movement of the hot water storage type water heater of Embodiment 1. FIG. It is a figure which shows the state in the simultaneous operation | movement of the boiling operation and hot-water supply operation | movement of the hot water storage type water heater of Embodiment 1. FIG. It is a figure which shows the time of the boiling top chasing simultaneous operation of the hot water storage type water heater of Embodiment 1. FIG. It is a figure which shows the state during the simultaneous driving | operation of the boiling chasing simultaneous operation and hot-water supply operation | movement of the hot water storage type water heater of Embodiment 1. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, while the flow path used as the center of description is shown with the thick line, the flow direction of hot water is supplementarily shown with the arrow. Moreover, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot water storage type water heater 100 according to Embodiment 1 of the present invention. A hot water storage type water heater 100 shown in FIG. 1 includes a hot water storage tank unit 1 and a heat pump unit 60 configured to use a heat pump cycle. The two units 1 and 60 are connected by a heat pump inlet pipe 41 and a heat pump outlet pipe 42. The hot water storage tank unit 1 has a control unit 70 built therein. Operations of various valves, pumps and the like provided in the hot water storage tank unit 1 and the heat pump unit 60 are controlled by a control unit 70 electrically connected thereto. Hereinafter, each component of the hot water storage type water heater 100 will be described.

  The heat pump unit 60 functions as a heating means for heating (boiling) the low temperature water led from the hot water storage tank unit 1. The heat pump unit 60 includes a compressor 61, a heating heat exchanger 62, an expansion valve 63, and an air heat exchanger 64 connected in a ring shape with a refrigerant circulation pipe 65 to constitute a refrigeration cycle (heat pump cycle). The boiling heat exchanger 62 is for exchanging heat between the refrigerant flowing through the refrigerant circulation pipe 65 constituting the heat pump cycle and the low-temperature water led from the hot water storage tank unit 1. The HP outlet side thermistor 66 is a temperature sensor for detecting the temperature of the high-temperature water heated by the boiling heat exchanger 62, and is provided in the heat pump outlet pipe 42. In order to obtain high-temperature water by the heat pump unit 60, it is preferable that the heat pump cycle is operated at a pressure exceeding the critical pressure using carbon dioxide, which is a kind of natural refrigerant, as the refrigerant.

  On the other hand, the hot water storage tank unit 1 incorporates the following various parts and piping. The hot water storage tank 10 is for storing hot water. A water supply pipe 2 for supplying city water is connected to the lower part of the hot water storage tank 10, and a hot water supply pipe 3 for supplying the stored hot water to a hot water outlet outside the water heater is connected to the upper part of the hot water storage tank 10. Is branched from the tank upper pipe 43 and connected thereto. The hot water tank 10 is supplied with hot water heated by the heat pump unit 60 from the upper part of the tank, and low temperature water is supplied from the lower part of the tank through the water supply pipe 2 to thereby store the hot water in the hot water storage tank 10. Hot water is stored so that there is a temperature difference between the upper part and the lower part. Further, the remaining hot water thermistors 11 and 12 for detecting the temperature distribution of hot water in the hot water storage tank 10 by changing the mounting height are attached to the surface of the hot water storage tank 10. Based on the temperature distribution acquired by the remaining hot water thermistors 11 and 12, the amount of hot water in the hot water storage tank 10 is grasped, and the start and stop of the hot water boiling operation in the hot water storage tank 10 by the heat pump unit 60 is controlled. Is done.

  The hot water storage tank unit 1 includes a circulation pump 21 and a use side heat exchanger 22. The circulation pump 21 is a pump for circulating hot water through various pipes to be described later in the hot water storage tank unit 1. The use-side heat exchanger 22 uses the high-temperature water supplied from the hot water storage tank 10 and the heat pump unit 60 to heat the secondary-side heating target water (tub circulation water, heating circulation water, etc.). It is an exchanger. In the present embodiment, as a secondary side configuration of the use side heat exchanger 22, a bathtub water circulation circuit 51 that circulates hot water in the bathtub 50 will be described as an example. The use side heat exchanger 22 is installed in the middle of the bathtub water circulation circuit 51. Further, a secondary circulation pump 52 for circulating the bathtub water and a bathtub outlet side thermistor 53 for detecting the temperature of the bathtub water discharged from the bathtub 50 are installed in the middle of the bathtub water circulation circuit 51. Yes.

  Next, the valves and piping included in the hot water storage tank unit 1 will be described. The hot water storage tank unit 1 has a three-way valve 31 and a four-way valve 32. The three-way valve 31 is a flow path switching means having two inlets (a port and b port) through which hot water flows and one outlet (c port) through which hot water flows out. Either the a port or the b port The hot water path can be switched so that hot water flows in from the water. The four-way valve 32 is a flow path switching means having one inlet (a port) through which hot water flows in and three outlets (b port, c port, d port) through which hot water flows out. , A-b route, a-c route, and a-d route are configured to be able to switch the flow path form.

  The hot water storage tank unit 1 includes a tank lower pipe 40, the heat pump inlet pipe 41, the heat pump outlet pipe 42, a tank upper pipe 43, a tank return pipe 44, and a use side heat exchanger primary side (heat source side) inlet pipe 45. The use side heat exchanger has a primary side outlet pipe 46 and a bypass pipe 47.

  More specifically, the tank lower pipe 40 is a flow path that connects the first lower part of the hot water storage tank 10 and the a port of the three-way valve 31. The heat pump inlet pipe 41 is a flow path that connects the c port of the three-way valve 31 and the inlet side of the heat pump unit 60, and the heat pump outlet pipe 42 connects the outlet side of the heat pump unit 60 and the a port of the four-way valve 32. The tank upper pipe 43 is a flow path connecting the b port of the four-way valve 32 and the upper part of the hot water storage tank 10, and the tank return pipe 44 is the center of the c port of the four way valve 32 and the hot water storage tank 10. It is the flow path which connects the return port (2nd lower part) provided between the part and the lower part. The use side heat exchanger primary side inlet pipe 45 branches from between the hot water storage tank upper part of the tank upper pipe 43 and the four-way valve 32 and is connected to the primary side inlet of the use side heat exchanger 22. The use side heat exchanger primary side outlet pipe 46 is a flow path that connects the primary side outlet of the use side heat exchanger 22 and the b port of the three-way valve 31. Further, the bypass pipe 47 is a flow path that branches from the middle of the use side heat exchanger primary side outlet pipe 46 and is connected to the d port of the four-way valve 32.

  The hot water storage tank unit 1 further includes a water supply pipe 2, a hot water supply pipe 3, a water supply branch pipe 4, a hot water supply mixing valve 33, a bath mixing valve 34, a mixed water hot water supply pipe 33a, and a bathtub water hot water supply pipe 34a.

  More specifically, the water supply branch pipe 4 is branched from the middle of the water supply pipe 2 to constitute a water side pipe of the hot water supply mixing valve 33 and the bath mixing valve 34. The hot water supply pipe 3 branches off from the tank upper pipe 43 and constitutes a hot water side pipe of the hot water supply mixing valve 33 and the bath mixing valve 34. The hot water mixing valve 33 and the bath mixing valve 34 are set by a remote controller (not shown) that can be set by the user by adjusting the flow rate ratio of the high-temperature water supplied from the hot water supply pipe 3 and the water flowing from the water supply branch pipe 4. It is a valve that adjusts to the set temperature. The hot water whose temperature has been adjusted by the hot water supply mixing valve 33 is supplied from the mixed water hot water supply pipe 33a to a faucet (not shown) such as a shower or currant used by the user. The hot water adjusted to the set temperature by the bath mixing valve 34 is supplied to the bathtub 50 via the bathtub water circulation circuit 51 from the bathtub water supply pipe 34a.

  In the hot water storage type water heater 100 of the present embodiment, the three-way valve 31 is controlled according to the operation state shown in FIGS. 2 to 6 below, and between the following first and second flow path configurations, The hot water flow path in the hot water storage tank unit 1 is switched and used. More specifically, the “first flow path configuration” that can be selected by the three-way valve 31 means that the first lower part of the hot water storage tank 10 and the heating heat exchanger 62 connect the tank lower pipe 40 and the heat pump inlet pipe 41. The “second flow path configuration” means that the use side heat exchanger primary side outlet pipe 46 and the heating heat exchanger 62 are connected via the heat pump inlet pipe 41. It is a flow path form that communicates.

Furthermore, in the hot water storage type water heater 100 of the present embodiment, the four-way valve 32 is controlled according to the operation state shown in FIGS. Thus, the hot water flow path in the hot water storage tank unit 1 is switched and used. More specifically, the “first flow path configuration” that can be selected by the four-way valve 32 means that the heating heat exchanger 62 and the upper part of the hot water storage tank 10 are connected via the heat pump outlet pipe 42 and the tank upper pipe 43. The “second flow path configuration” is a flow channel configuration in which the boiling heat exchanger 62 and the tank return pipe 44 communicate with each other via the heat pump outlet pipe 42. The “third flow path configuration”
The boiling heat exchanger 62 and the bypass pipe 47 are in the form of a flow path communicating with each other via the heat pump outlet pipe 42.

  FIG. 2 is a circuit configuration diagram in the standby state of hot water storage type water heater 100 according to Embodiment 1 of the present invention. This standby state is a state in which any operation such as a heating operation and bath water replenishment operation described later is not performed. In the standby state, the three-way valve 31 is controlled so that the a port communicates with the c port and the b port is closed (that is, the first flow path configuration of the three-way valve 31 is selected). The Accordingly, the tank lower pipe 40 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the usage side heat exchanger 22 is blocked by closing the usage side heat exchanger primary side outlet pipe 46 side. In the standby state, the four-way valve 32 is selected such that the port a and the port c communicate with each other and the port b and the port d are closed (that is, the second flow path configuration of the four-way valve 32 is selected). Controlled). Thereby, the heat pump outlet pipe 42 and the tank return pipe 44 communicate with each other, and the flow path on the tank upper pipe 43 side is closed. In this standby state, all of the circulation pump 21, the heat pump unit 60, and the secondary side circulation pump 52 are in a stopped state.

  Next, FIG. 3 is a circuit configuration diagram of the hot water storage type water heater 100 according to Embodiment 1 of the present invention at the time of a single heating operation. The boiling-up single operation referred to here is one in which the heating-up operation of boiling the water in the hot water storage tank 10 using the heat pump unit 60 is performed independently. During this boiling-only operation, the three-way valve 31 communicates with the a-port and the c-port, and the b-port is closed (that is, the first flow path configuration of the three-way valve 31 is selected. Controlled). Accordingly, the tank lower pipe 40 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the usage side heat exchanger 22 is blocked by closing the usage side heat exchanger primary side outlet pipe 46 side. Further, during the boiling-only operation, the four-way valve 32 is configured such that the a port and the b port communicate with each other and the c port and the d port are closed (that is, the first flow path configuration of the four-way valve 32 is To be controlled). Thereby, the heat pump outlet pipe 42 and the tank upper pipe 43 communicate with each other, and the flow path to the second lower part of the hot water storage tank 10 is blocked by closing the tank return pipe 44 side.

  The boiling-up single operation is executed by starting the operation of the circulation pump 21 and the heat pump unit 60 in a state where the three-way valve 31 and the four-way valve 32 are controlled as described above. As a result, the low-temperature water flowing out from the first lower part of the hot water storage tank 10 is guided to the heat pump unit 60 via the tank lower pipe 40, the three-way valve 31, the circulation pump 21 and the heat pump inlet pipe 41, and heat exchange for boiling is performed. After being heated in the vessel 62, it becomes hot water and flows into the hot water storage tank 10 from the upper part of the hot water storage tank 10 through the heat pump outlet pipe 42, the four-way valve 32 and the tank upper pipe 43. By performing such boiling-up single operation, high temperature water is stored from the upper layer inside the hot water storage tank 10, and this high temperature water layer gradually becomes thicker.

  FIG. 4 is an operation circuit configuration diagram in the case where a hot water supply operation occurs during the boiling-only operation of hot water storage type water heater 100 according to Embodiment 1 of the present invention. When the user opens the faucet or the like, the flow rate ratio is set so that the hot water stored in the upper part of the hot water storage tank 10 and the low temperature water supplied from the water supply branch pipe 4 become the temperature set by the hot water supply mixing valve 33. The hot water is supplied to the faucet or the like via the mixed water hot water supply pipe 33a. The high-temperature water heated by boiling is supplied to the hot water mixing valve 33 via the hot water supply pipe 3 branched from the upper pipe 43. For this reason, since hot water is directly stored in the faucet without being stored in the hot water storage tank 10, it is possible to reduce energy loss caused by heat dissipation generated when hot water is stored in the hot water storage tank 10. In addition, although the case of hot water supply to a faucet etc. was demonstrated above, it is the same also in the case of hot water supply to the bathtub 50, and it is possible to reduce the energy loss which generate | occur | produces by the heat radiation which arises when hot water is stored in the hot water storage tank 10. It becomes.

  Next, FIG. 5 is a circuit configuration diagram of the hot water storage water heater 100 according to Embodiment 1 of the present invention during simultaneous boiling-up chasing operation. Here, the simultaneous boiling-up operation is a combined operation in which a heating operation for boiling hot water in the hot water storage tank 10 by the heat pump unit 60 and a bath water tracking operation are performed simultaneously. Specifically, this boiling-up chasing simultaneous operation is executed when the bathtub water chasing operation is performed, for example, during the boiling-only operation shown in FIG. At the time of this boiling-up simultaneous operation, the b-port and c-port of the three-way valve 31 communicate with the boiling-only operation state shown in FIG. 3 (that is, the second flow path configuration of the three-way valve 31 is selected. The three-way valve 31 is controlled. Accordingly, a path is provided in which hot water led from the use side heat exchanger primary side outlet pipe 46 flows to the heat pump inlet pipe 41 via the three-way valve 31. On the other hand, with respect to the control of the four-way valve 32, there is no change from the single heating operation state, the control in which the a port and the b port are communicated and the c port and the d port are closed is maintained.

  In this simultaneous boiling-up operation, the secondary-side circulation pump 52 is operated in addition to the circulation pump 21 and the heat pump unit 60 that are already operated in a state where the three-way valve 31 and the four-way valve 32 are controlled as described above. It is executed by starting. As a result, the hot water after the heat exchange flowing out from the use side heat exchanger 22 is guided to the heat pump unit 60 via the use side heat exchanger primary side outlet pipe 46, the three-way valve 31, and the circulation pump 21, and boiled. After being heated in the raising heat exchanger 62, it becomes high-temperature water and is used side heat exchange via the heat pump outlet pipe 42, the four-way valve 32, the tank upper pipe 43, and the usage side heat exchanger primary side inlet pipe 45. Returned to vessel 22. In this case, the circulation of hot water to the upper part of the hot water storage tank 10 is interrupted. On the other hand, in the path on the bathtub 50 side, the hot water stretched on the bathtub 50 circulates in the bathtub water circulation circuit 51 by operating the secondary circulation pump 52. As a result, the heat of the high-temperature water flowing through the primary side of the use side heat exchanger 22 is transferred to the hot water flowing through the secondary side of the use side heat exchanger 22, and the hot water stretched in the bathtub 50 is warmed.

  Next, FIG. 6 is a circuit configuration diagram of the hot water storage type hot water heater according to Embodiment 1 of the present invention at the time of simultaneous boiling up operation and hot water supply operation. The simultaneous boiling hot water supply operation and the simultaneous hot water supply operation are the boiling hot water simultaneous operation method that improves the efficiency most when the hot water supply operation occurs during the simultaneous boiling hot water operation shown in FIG. It is. When the user opens the faucet or the like, the flow rate ratio is set so that the hot water stored in the upper part of the hot water storage tank 10 and the low temperature water supplied from the water supply branch pipe 4 become the temperature set by the hot water supply mixing valve 33. The hot water is supplied to the faucet via the mixed water hot water supply pipe 33a. The three-way valve 31 is configured so that the a-port and the c-port of the three-way valve 31 communicate with each other (that is, the first flow path configuration of the three-way valve 31 is selected) from the boiling-up chasing simultaneous operation state shown in FIG. Is controlled. Further, the four-way valve 32 is controlled so that the a port and the d port communicate with each other and the b port and the c port are closed (that is, the third flow path configuration of the four-way valve 32 is selected). This control is performed when the controller 70 detects that the hot water has been discharged by hot water detection means (not shown).

  As a result, the low temperature water flowing out from the first lower part of the hot water storage tank 10 is guided to the heat pump unit 60 via the tank lower pipe 40, the three-way valve 31, the circulation pump 21 and the heat pump inlet pipe 41, and heat exchange for boiling is performed. After being heated in the vessel 62, it becomes high-temperature water and passes through the use side heat exchanger 22 via the heat pump outlet pipe 42, the four-way valve 32, the bypass pipe 47, and the use side heat exchanger primary side outlet pipe 46. After the heat is deprived by the use side heat exchanger 22 and becomes warm water, the temperature is set by the hot water supply mixing valve 33 via the use side heat exchanger primary side inlet pipe 45, the upper pipe 43 and the hot water supply pipe 3. The hot water is supplied from the mixed water hot water supply pipe 33a to the faucet.

  As the order of switching the flow paths of the three-way valve 31 and the four-way valve 32, if the four-way valve 32 is switched first (the third flow path configuration is selected), the hot water is heated in the boiling heat exchanger 62. Then, the high-temperature water is boiled again through the heat pump outlet pipe 42, the four-way valve 32, the bypass pipe 47, the use side heat exchanger primary side outlet pipe 46, the three-way valve 31, the circulation pump 21 and the heat pump inlet pipe 41. Since it is supplied to the heat exchanger 62, the boiling water cannot be used, and the boiling efficiency is lowered. Therefore, in order to prevent this and perform an efficient operation, the three-way valve 31 is switched to the first channel form before the four-way valve 32. By adopting such an order, the low temperature water flowing out from the first lower portion of the hot water storage tank 10 can flow between the tank lower pipe 40 and the three-way valve 31 even from the time when the three-way valve 31 is switched to the time when the four-way valve 32 is switched. Then, after being led to the heat pump unit 60 via the circulation pump 21 and the heat pump inlet pipe 41 and heated in the heating heat exchanger 62, it becomes high-temperature water and the heat pump outlet pipe 42, the four-way valve 32, and the tank upper pipe. Hot water boiled through 43 and hot water remaining in each pipe are used for hot water supply. Furthermore, use of hot water in the use-side heat exchanger 22 can be performed by completing the switching of the four-way valve 32. By configuring and controlling in this way, the water flowing into the boiling heat exchanger 62 can use the low-temperature water at the lower part of the hot water storage tank 10, the heat pump boiling efficiency is high, and energy loss due to hot water storage is further reduced. And efficient operation becomes possible. In addition, although the case of hot water supply to a faucet etc. was demonstrated above, the same control is made also in the case of hot water supply to the bathtub 50, and there exists the same effect.

  According to the hot water storage type water heater 100 of the present embodiment as described above, low-temperature water is supplied to the heat pump unit 60 using the single circulation pump 21 during the simultaneous boiling-up chasing operation and the hot-water supply operation. In addition, the medium temperature water after reheating can be used directly for hot water supply, and by storing the medium temperature water after reheating in the hot water storage tank 10, it is possible to operate with high efficiency without reducing the boiling efficiency. It becomes possible to do.

  By the way, in Embodiment 1 mentioned above, the bathtub water reheating operation which retreats bathtub water was demonstrated as an example of the heating operation which heats heating object water. However, the heating operation of the present invention is not limited to this, and may be, for example, a heating operation using heating circulation water as heating target water.

  In Embodiment 1 described above, the heat pump cycle is a supercritical heat pump cycle in which the pressure of the refrigerant is equal to or higher than the critical pressure, but may be a heat pump cycle that is equal to or lower than a general critical pressure. In this case, chlorofluorocarbon, ammonia, or the like may be used as the refrigerant.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit 3 Hot water supply pipe 10 Hot water storage tank 21 Circulation pump 22 Use side heat exchanger 31 Three-way valve (1st flow-path switching means)
32 Four-way valve (second flow path switching means)
40 Tank lower piping (boiling water circulation circuit)
41 Heat pump inlet piping (boiling water circulation circuit)
42 Heat pump outlet piping (boiling water circulation circuit)
43 Tank upper piping (boiling water circulation circuit)
44 Tank return piping (lower return flow path)
45 Use side heat exchanger primary side inlet piping (heat source side flow path)
46 Use side heat exchanger primary side outlet piping (heat source side flow path)
47 Bypass piping (bypass flow path)
50 Bathtub 51 Bathwater Circulation Circuit 52 Secondary Circulation Pump 60 Heat Pump Unit 61 Compressor 62 Boiling Heat Exchanger 63 Expansion Valve 64 Air Heat Exchanger 70 Control Unit 100 Hot Water Storage Water Heater

Claims (4)

A hot water storage tank, a heat exchanger for boiling that heats the water in the hot water storage tank using heating means by a heat pump to form high temperature water,
A use side heat exchanger for exchanging heat between the hot water in the hot water storage tank and a predetermined water to be heated;
A boiling water circulation circuit in which one end is connected to the upper part of the hot water storage tank, the boiling heat exchanger is installed in the middle, and the other end is connected to the first lower part of the hot water storage tank;
One end is connected between the upper part of the hot water storage tank in the boiling water circulation circuit and the heat exchanger for boiling, the use side heat exchanger is installed in the middle, and the other end in the boiling water circulation circuit A heat source side that constitutes a flow path that is connected between the first lower portion of the hot water storage tank and the boiling heat exchanger via a first flow path switching means and that serves as a heat source side of the use side heat exchanger. A flow path;
A second flow path switching means installed between the connection portion with the one end of the heat source side flow path in the boiling water circulation circuit and the heating heat exchanger;
A lower return flow path connecting the second flow path switching means and the second lower portion of the hot water storage tank;
A circulation pump installed between the first flow path switching means and the boiling heat exchanger in the boiling water circulation circuit;
One end is connected between the use side heat exchanger of the heat source side flow path and the first flow path switching means,
A bypass flow path whose other end is connected to the second flow path switching means;
A hot water supply pipe having one end connected between the second flow path switching means and the upper part of the hot water storage tank in the boiling water circulation circuit, and the other end connected to a hot water outlet in the hot water storage tank;
With
The first flow path switching means includes a first flow path configuration in which the first lower portion of the hot water storage tank and the boiling heat exchanger communicate with each other via the boiling water circulation circuit, the heat source side flow path, A means capable of selecting a second flow path configuration in which the boiling heat exchanger communicates with the boiling water circulation circuit;
The second flow path switching means includes a first flow path configuration in which the boiling heat exchanger and the upper part of the hot water storage tank communicate with each other via the boiling water circulation circuit, the boiling heat exchanger, A second flow path configuration in which the lower return flow path communicates with the boiling water circulation circuit, the boiling heat exchanger and the heating heat exchanger include the boiling water circulation circuit, and the bypass flow path. The hot water storage type hot water heater is a means capable of selecting a third flow path form communicating with the heat source side flow path. During boiling operation to boil water in the hot water storage tank,
The first flow path switching means is controlled so that the first flow path form is selected, the second flow path switching means is controlled so that the first flow path form is selected, and the circulation A boiling operation control means for controlling the pump to operate;
When performing the heating operation by the use side heat exchanger during the boiling operation using the control means during the boiling operation,
Boiling heating simultaneous control means for switching the flow path form selected by the first flow path switching means from the first flow path form to the second flow path form;
The hot water storage type water heater according to claim 1, comprising: When hot water is supplied during the operation of the boiling heating simultaneous control means,
Boiling hot water heating that controls the first flow path switching means so that the first flow path configuration is selected and controls the second flow path switching means so that the third flow path configuration is selected. Simultaneous control means
The hot water storage type water heater according to claim 2, wherein the hot water storage type water heater is provided. The hot water boiling boiling simultaneous control means is
The hot water storage type hot water supply apparatus according to claim 3, wherein the flow path switching by the first flow path switching means is performed prior to the flow path switching by the second flow path switching means.

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