JP5831375B2 - Hot water storage water heater - Google Patents

Description

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

  The low temperature water stored in the hot water storage tank that can store the upper layer side water and the lower layer side water in a stacked state is discharged from the bottom, and the low temperature water is boiled up by heating means such as a heat pump type heat source to store the hot water storage tank. In the hot water storage water heater that stores the hot water in the hot water storage tank by performing the boiling operation to return to the upper part of the hot water storage tank, a heat exchanger for heating an object to be heated (for example, bath water stored in the bathtub) is provided. A technique is known that enables, for example, bathing and warming a bath by performing a heating operation in which hot water taken out from a hot water storage tank is returned to the hot water storage tank via the heat exchanger as heat source water (for example, patents) Reference 1).

JP 2004-197958 A

  As described above, when hot water is refilled using hot water from a hot water storage tank, hot water is supplied to the heat exchanger from the top of the hot water storage tank, and heat is exchanged by this heat exchanger to lower the temperature. Then, it becomes warm water (medium temperature water) at an intermediate temperature of about 30 ° C. to 50 ° C. and returns to the lower part of the hot water storage tank. For this reason, in the hot water storage tank, medium-temperature water often accumulates in an intermediate portion in the vertical direction. In particular, when reheating from the remaining hot water the previous day, the amount of hot water in the hot water storage tank is greatly reduced, and a larger amount of medium-temperature water is generated in the lower part of the hot water storage tank. In that case, in order to make up for the reduced amount of heat stored in the hot water storage tank, the heat pump type heating source is activated to perform the boiling operation. However, if a large amount of medium-temperature water is generated in the intermediate portion of the hot water storage tank and the hot water temperature in the hot water storage tank is lowered, the temperature boundary layer in the hot water storage tank may be disturbed. Moreover, if a boiling operation is performed in a state where a large amount of medium-temperature water is accumulated, the medium-temperature water is supplied to a heat pump heating source. When such medium temperature water is heated with a heat pump heating source, there is a problem that efficiency is poor and COP (energy consumption efficiency) is lowered.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to improve energy efficiency in a hot water storage type hot water heater provided with a heat exchanger capable of heating an object to be heated.

A hot water storage type hot water supply apparatus according to the present invention includes a heating means capable of heating water to generate hot water, a hot water storage tank capable of storing the upper layer side water and the lower layer side water in a laminated state, and a heated object as a heat source. Heat exchanger heated by exchanging heat with water and hot water taken from the upper area of the hot water storage tank are sent to the heat exchanger as heat source water, and the heat source water that has passed through the heat exchanger flows into the upper area of the hot water storage tank A first heat source water circulation operation, and hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as heat source water, and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. A means for performing a second heat source water circulation operation, and a third heat source for sending hot water heated by the heating means to the heat exchanger as heat source water, and sending the heat source water that has passed through the heat exchanger to the heating means for recirculation Means for water circulation operation and heat source in heat exchanger When the heating operation to heat the object to be heated is performed by selecting one of the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation according to a predetermined rule A hot water supply operation for sending hot water taken out from the upper region of the hot water storage tank to a hot water supply destination, and the control means is provided when a request for performing a heating operation occurs during the hot water supply operation. Is performed with priority on the second heat source water circulation operation or the third heat source water circulation operation .
Further, the hot water storage type hot water heater according to the present invention includes a heating means capable of heating water to generate hot water, a hot water storage tank capable of storing upper layer side hot water and lower layer side water in a stacked state, and an object to be heated. The heat exchanger that heats the water by heat exchange with the heat source water, and the hot water extracted from the upper area of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger is sent to the upper area of the hot water storage tank. The first heat source water circulation operation to flow into the hot water and the hot water taken out from the upper area of the hot water storage tank are sent as heat source water to the heat exchanger, and the heat source water that has passed through the heat exchanger flows into the lower area of the hot water storage tank A second heat source water circulation operation to be performed, a hot water heated and generated by the heating means is sent to the heat exchanger as a heat source water, and the heat source water that has passed through the heat exchanger is sent to the heating means for recirculation. Of heat source water circulation operation and heat exchanger When performing the heating operation of sending the heat source water to heat the object to be heated, select one of the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation according to a predetermined rule. And a control means for carrying out the hot water supply operation to send the hot water taken out from the upper region of the hot water storage tank to the hot water supply destination, and the control means starts the hot water supply operation during the execution of the first heat source water circulation operation. In such a case, the first heat source water circulation operation is stopped and the second heat source water circulation operation or the third heat source water circulation operation is performed.
Further, the hot water storage type hot water heater according to the present invention includes a heating means capable of heating water to generate hot water, a hot water storage tank capable of storing upper layer side hot water and lower layer side water in a stacked state, and an object to be heated. The heat exchanger that heats the water by heat exchange with the heat source water, and the hot water extracted from the upper area of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger is sent to the upper area of the hot water storage tank. The first heat source water circulation operation to flow into the hot water and the hot water taken out from the upper area of the hot water storage tank are sent as heat source water to the heat exchanger, and the heat source water that has passed through the heat exchanger flows into the lower area of the hot water storage tank A second heat source water circulation operation to be performed, a hot water heated and generated by the heating means is sent to the heat exchanger as a heat source water, and the heat source water that has passed through the heat exchanger is sent to the heating means for recirculation. Of heat source water circulation operation and heat exchanger When performing the heating operation of sending the heat source water to heat the object to be heated, select one of the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation according to a predetermined rule. Control means, and means for performing a lower circulation operation for returning water taken out from the lower area of the hot water storage tank to the lower area of the hot water storage tank via the heating means, and in the second heat source water circulation operation, The second heat source water circulation operation without lower circulation that allows the heat source water that has passed through the heat exchanger to flow into the lower region of the hot water storage tank without passing through the heating means, and the heat source water that has passed through the heat exchanger was passed through the heating means And a second heat source water circulation operation with a lower circulation that flows into the lower region of the hot water storage tank above, and the control means has a lower part when there is both a request for performing a heating operation and a request for performing a lower circulation operation. Second heat with circulation Water circulation operation is to performed preferentially.
Further, the hot water storage type hot water heater according to the present invention includes a heating means capable of heating water to generate hot water, a hot water storage tank capable of storing upper layer side hot water and lower layer side water in a stacked state, and an object to be heated. The heat exchanger that heats the water by heat exchange with the heat source water, and the hot water extracted from the upper area of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger is sent to the upper area of the hot water storage tank. The first heat source water circulation operation to flow into the hot water and the hot water taken out from the upper area of the hot water storage tank are sent as heat source water to the heat exchanger, and the heat source water that has passed through the heat exchanger flows into the lower area of the hot water storage tank A second heat source water circulation operation to be performed, a hot water heated and generated by the heating means is sent to the heat exchanger as a heat source water, and the heat source water that has passed through the heat exchanger is sent to the heating means for recirculation. Of heat source water circulation operation and heat exchanger When performing the heating operation of sending the heat source water to heat the object to be heated, select one of the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation according to a predetermined rule. Control means to be implemented, air discharge means for discharging the air in the hot water storage tank, and air detection means capable of detecting that air has entered the pipe communicating with the hot water storage tank, When air mixing is detected by the air detection means, or when an air venting operation command is forcibly received and a request for performing a heating operation is generated, the second heat source water circulation operation is performed. It is implemented with priority.
Further, the hot water storage type hot water heater according to the present invention includes a heating means capable of heating water to generate hot water, a hot water storage tank capable of storing upper layer side hot water and lower layer side water in a stacked state, and an object to be heated. The heat exchanger that heats the water by heat exchange with the heat source water, and the hot water extracted from the upper area of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger is sent to the upper area of the hot water storage tank. The first heat source water circulation operation to flow into the hot water and the hot water taken out from the upper area of the hot water storage tank are sent as heat source water to the heat exchanger, and the heat source water that has passed through the heat exchanger flows into the lower area of the hot water storage tank A second heat source water circulation operation to be performed, a hot water heated and generated by the heating means is sent to the heat exchanger as a heat source water, and the heat source water that has passed through the heat exchanger is sent to the heating means for recirculation. Of heat source water circulation operation and heat exchanger When performing the heating operation of sending the heat source water to heat the object to be heated, select one of the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation according to a predetermined rule. Control means, first flow path switching means, second flow path switching means, third flow path switching means, first upper port provided in the upper region of the hot water storage tank and second An upper port, a first lower port and a second lower port provided in a lower region of the hot water storage tank, a heat source circulation pump for circulating hot water, a first lower port, a first flow path switching means, A heating circuit is formed by sequentially connecting a heat source circulation pump, a water inlet of the heating means, a hot water outlet of the heating means, a third flow path switching means, and a first upper port, and the heating means and the heat source By operating the circulation pump, from the hot water storage tank through the first lower port A heating operation for feeding the discharged water to the heating means and flowing the hot water generated by the heating means into the hot water storage tank from the first upper port, and the first heat source water circulation operation is Two upper ports, second flow path switching means, heat source water inlet of the heat exchanger, heat exchanger heat source water outlet, first flow path switching means, heat source circulation pump, third The first heat source water circulation circuit is formed by sequentially connecting the flow path switching means and the first upper port, and the heat source water circulation operation is performed by operating the heat source circulation pump, and the second heat source water circulation operation. The second upper port or the first upper port, the second flow path switching means, the heat source water inlet of the heat exchanger, the heat source water outlet of the heat exchanger, and the first flow path switching means The second heat source water circulation by sequentially connecting the heat source circulation pump, the third flow path switching means, and the second lower port. This is an operation of forming a ring circuit and operating the heat source circulation pump to circulate the heat source water. The third heat source water circulation operation is a heating port of the heating means, a third flow path switching means, and a second flow switch. The path switching means, the heat source water inlet of the heat exchanger, the heat source water outlet of the heat exchanger, the first flow path switching means, the heat source circulation pump, and the water inlet of the heating means are sequentially connected. Thus, the third heat source water circulation circuit is formed, and the heating means and the heat source circulation pump are operated to circulate the heat source water.
Further, the hot water storage type hot water heater according to the present invention includes a heating means capable of heating water to generate hot water, a hot water storage tank capable of storing upper layer side hot water and lower layer side water in a stacked state, and an object to be heated. The heat exchanger that heats the water by heat exchange with the heat source water, and the hot water extracted from the upper area of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger is sent to the upper area of the hot water storage tank. The first heat source water circulation operation to flow into the hot water and the hot water taken out from the upper area of the hot water storage tank are sent as heat source water to the heat exchanger, and the heat source water that has passed through the heat exchanger flows into the lower area of the hot water storage tank A second heat source water circulation operation to be performed, a hot water heated and generated by the heating means is sent to the heat exchanger as a heat source water, and the heat source water that has passed through the heat exchanger is sent to the heating means for recirculation. Of heat source water circulation operation and heat exchanger When performing the heating operation of sending the heat source water to heat the object to be heated, select one of the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation according to a predetermined rule. And when the first heat source water circulation operation is started, the control means starts the first heat source water circulation operation after temporarily performing the second heat source water circulation operation prior to the first heat source water circulation operation. And a control mode for starting the first heat source water circulation operation without temporarily performing the second heat source water circulation operation.
Further, the hot water storage type hot water heater according to the present invention includes a heating means capable of heating water to generate hot water, a hot water storage tank capable of storing upper layer side hot water and lower layer side water in a stacked state, and an object to be heated. The heat exchanger that heats the water by heat exchange with the heat source water, and the hot water extracted from the upper area of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger is sent to the upper area of the hot water storage tank. The first heat source water circulation operation to flow into the hot water and the hot water taken out from the upper area of the hot water storage tank are sent as heat source water to the heat exchanger, and the heat source water that has passed through the heat exchanger flows into the lower area of the hot water storage tank A second heat source water circulation operation to be performed, a hot water heated and generated by the heating means is sent to the heat exchanger as a heat source water, and the heat source water that has passed through the heat exchanger is sent to the heating means for recirculation. Of heat source water circulation operation and heat exchanger When performing the heating operation of sending the heat source water to heat the object to be heated, select one of the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation according to a predetermined rule. And a control means for performing the first heat source water circulation operation, and the position of the inlet through which the heat source water that has passed through the heat exchanger in the first heat source water circulation operation flows into the hot water storage tank is the heat source water from the hot water storage tank in the first heat source water circulation operation. It is in a position higher than the position of the outlet to be taken out.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the energy efficiency in the hot water storage type water heater provided with the heat exchanger which can heat a to-be-heated material.

It is a block diagram which shows the hot water storage type water heater of Embodiment 1 of this invention. It is a circuit block diagram at the time of the boiling operation in the hot water storage type water heater of Embodiment 1 of this invention. It is a circuit block diagram at the time of the bathtub heating operation | movement by the 1st heat source water circulation driving | operation in the hot water storage type water heater of Embodiment 1 of this invention. It is a circuit block diagram at the time of the bathtub heating operation | movement by the 2nd heat source water circulation driving | operation in the hot water storage type water heater of Embodiment 1 of this invention. It is a circuit block diagram at the time of the bathtub heating operation | movement by the other form of the 2nd heat-source water circulation driving | operation in the hot water storage type water heater of Embodiment 1 of this invention. It is a circuit block diagram at the time of the bathtub heating operation | movement by the 3rd heat source water circulation driving | operation in the hot water storage type water heater of Embodiment 1 of this invention. It is a circuit block diagram at the time of the hot water supply operation | movement in the hot water storage type water heater of Embodiment 2 of this invention. It is a circuit block diagram at the time of the lower circulation operation | movement in the hot water storage type water heater of Embodiment 3 of this invention. It is a circuit block diagram at the time of the bathtub heating operation | movement by the 2nd heat source water circulation operation | movement with a lower circulation in the hot water storage type hot water heater of Embodiment 3 of this invention. It is a circuit block diagram at the time of the bathtub heating operation | movement by the other form of the 2nd heat source water circulation operation | movement with a lower circulation in the hot water storage type hot water supply apparatus of Embodiment 3 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, 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 illustrating a hot water storage type water heater according to Embodiment 1 of the present invention. As shown in FIG. 1, a hot water storage type water heater 100 of the present embodiment includes a hot water storage unit 1 and a heat pump unit 60 configured to use a heat pump cycle. The hot water storage unit 1 and the heat pump unit 60 are connected via a heat pump inlet pipe 41, a heat pump outlet pipe 42, and electrical wiring (not shown). The hot water storage unit 1 includes a control unit 70 (control means). Operations of various valves, pumps, and the like included in the hot water storage unit 1 and the heat pump unit 60 are controlled by a control unit 70 electrically connected thereto. The control unit 70 is connected to a user interface device such as a remote control device installed in a bathroom or kitchen so as to communicate with each other. 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 up) the water guided from the hot water storage unit 1. The heat pump unit 60 connects a compressor 61, a heating heat exchanger 62, an expansion valve 63, and an air heat exchanger 64 in a ring shape with a working medium circulation pipe 65, thereby constituting a refrigeration cycle (heat pump cycle). . The boiling heat exchanger 62 is for exchanging heat between the working medium flowing through the working medium circulation pipe 65 constituting the heat pump cycle and the water guided from the hot water storage unit 1. 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 as a working medium.

  The hot water storage unit 1 includes the following various parts and piping. The hot water storage tank 10 is for storing hot water. A water supply pipe 2 for supplying water from an external water source such as a water supply is connected to a water supply port 14 provided in the lower part of the hot water storage tank 10 via a pressure reducing valve 4. A second tank upper pipe 44 is connected to the first upper port 15 provided in the upper part of the hot water storage tank 10. The hot water supply pipe 3 branched and extended from the middle of the second tank upper pipe 44 is connected to the hot water supply mixing valve 5 and the bath mixing valve 6, respectively. A water supply pipe 2 on the downstream side of the pressure reducing valve 4 is further connected to the hot water supply mixing valve 5 and the bath mixing valve 6. The hot water supply mixing valve 5 mixes hot hot water taken out from the first upper port 15 of the hot water storage tank 10 and supplied through the hot water supply pipe 3 with low temperature water supplied from the water supply pipe 2. The mixing ratio is adjusted so that the set hot water temperature is reached. Hot water mixed by the hot water supply mixing valve 5 is supplied to a hot water supply destination 80 such as a faucet or a shower through the mixed hot water supply pipe 9. The bath mixing valve 6 mixes hot hot water taken out from the first upper port 15 of the hot water storage tank 10 and supplied through the hot water supply pipe 3 with low temperature water supplied from the water supply pipe 2. Hot water mixed by the bath mixing valve 6 is supplied into the bathtub 50 via the bathtub water circulation circuit 51.

  Hot water (hot water) generated by heating using the heat pump unit 60 flows into the hot water storage tank 10 from the first upper port 15, and low temperature water from the water supply pipe 2 flows into the hot water storage tank 10 from the water supply port 14. By doing so, temperature stratification is formed in the hot water storage tank 10 so that the upper layer side is at a high temperature and the lower layer side is at a low temperature so that hot water can be stored. A plurality of hot water temperature sensors (not shown) are attached to the surface of the hot water storage tank 10 at different height positions in order to detect the temperature distribution of the hot water in the hot water storage tank 10. The control unit 70 can calculate the amount of stored hot water (heat storage amount) in the hot water storage tank 10 based on the temperature distribution in the height direction in the hot water storage tank 10 acquired by these hot water storage temperature sensors. Based on the above, the start and stop of the heating operation, which will be described later, are controlled.

  The hot water storage unit 1 includes a heat source circulation pump 21 and a use side heat exchanger 22. The heat source circulation pump 21 is a pump for circulating hot water through various pipes. The use side heat exchanger 22 is a heat exchanger for heating an object to be heated by using hot water supplied from the hot water storage tank 10 or the heat pump unit 60 as heat source water and exchanging heat with the heat source water. The bathtub water circulation circuit 51 is arranged so that hot water (tub water) derived from the bathtub 50 is returned to the bathtub 50 via the use-side heat exchanger 22. In the middle of the bathtub water circulation circuit 51, there are a secondary circulation pump 52 for circulating the bathtub water, and a bathtub outlet temperature sensor 53 (tub temperature detection means) for detecting the temperature of the bathtub water discharged from the bathtub 50. is set up. As described above, in the present embodiment, as the secondary side configuration of the use side heat exchanger 22, the bathtub water circulation circuit 51 that circulates the bathtub water in the bathtub 50 is provided, and the bathtub water is supplied from the use side heat exchanger 22. Although what is heated is demonstrated to an example, the utilization side heat exchanger in this invention may heat to-be-heated objects other than bathtub water (for example, circulating water for heating, etc.).

  Next, the valves and piping provided in the hot water storage unit 1 will be described. The hot water storage unit 1 includes a first three-way valve 31 (first flow path switching means), a second three-way valve 32 (second flow path switching means), and a four-way valve 33 (third flow path switching means). ). The first three-way valve 31 and the second three-way valve 32 each have a flow path switch having two inlets (a port and b port) through which hot water flows and one outlet (c port) through which hot water flows out. It is a means, and it is comprised so that a hot water path | route can be switched so that hot water may flow in from either a port or b port. The four-way valve 33 is a flow path switching means having two inlets (b port and c port) through which hot water flows in and two outlets (a port and d port) through which hot water flows out. , B-a route, b-d route, c-a route, and cd route are configured to be switchable.

  The hot water storage unit 1 includes a tank lower pipe 40, a first tank upper pipe 43, a second tank upper pipe 44, a lower return pipe 45, a use side heat exchanger primary side inlet pipe 46, and a use side heat exchanger primary. A side outlet pipe 47, a bypass pipe 48, and an upper return pipe 49 are provided.

  The tank lower pipe 40 is a flow path that connects the first lower port 16 provided in the lower part of the hot water storage tank 10 and the a port of the first three-way valve 31. The heat pump inlet pipe 41 is a flow path that connects the c port of the first three-way valve 31 and the inlet side (water inlet) of the heat pump unit 60. The heat pump outlet pipe 42 is a flow path that connects the outlet side (outlet opening) of the heat pump unit 60 and the c port of the four-way valve 33. The first tank upper pipe 43 is a flow path that connects the second upper port 18 provided in the upper region (region above the middle) of the hot water storage tank 10 and the a port of the second three-way valve 32. . The second tank upper pipe 44 is a flow path that connects the first upper port 15 of the hot water storage tank 10 and the b port of the second three-way valve 32. The lower return pipe 45 is a flow path that connects the a port of the four-way valve 33 and the second lower port 17 provided in the lower region (region below the middle) of the hot water storage tank 10. The use side heat exchanger primary side inlet pipe 46 is a flow path that connects the c port of the second three-way valve 32 and the primary side inlet of the use side heat exchanger 22. The use side heat exchanger primary side outlet pipe 47 is a flow path that connects the primary side outlet of the use side heat exchanger 22 and the b port of the first three-way valve 31. The bypass pipe 48 extends from the heat pump inlet pipe 41 on the downstream side of the heat source circulation pump 21 and is connected to the b port of the four-way valve 33. The upper return pipe 49 is a flow path that branches off from the middle of the second tank upper pipe 44 and is connected to the d port of the four-way valve 33.

  In the present embodiment, the hot water storage tank 10 has a body portion formed in a cylindrical shape, a top portion formed in a substantially bowl shape, and a bottom portion formed in a substantially bowl shape. The second upper port 18 is provided in the top region of the hot water storage tank 10, and the first lower port 16, the second lower port 17 and the water supply port 14 are provided in the bottom region. The first upper port 15 is provided at a position higher than the second upper port 18.

  In the hot water storage type water heater 100 of the present embodiment, the following two first and second flow paths are controlled by controlling the second three-way valve 32 in accordance with the operation states shown in FIGS. It is designed to switch between forms. More specifically, the “first flow path configuration” that can be selected by the second three-way valve 32 is a flow path configuration that allows the first tank upper pipe 43 to communicate with the use side heat exchanger primary side inlet pipe 46. (Ac route). The “second flow path configuration” is a flow channel configuration (bc path) in which the second tank upper pipe 44 communicates with the use side heat exchanger primary side inlet pipe 46.

  Further, in the hot water storage type water heater 100 of the present embodiment, the first two-way valve 31 is controlled by controlling the first three-way valve 31 in accordance with the operation state shown in FIGS. It is designed to switch between road forms. More specifically, the “first flow path configuration” that can be selected by the first three-way valve 31 is a flow path configuration (ac path) that allows the tank lower pipe 40 to communicate with the heat pump inlet pipe 41. The “second flow path configuration” is a flow channel configuration (bc path) in which the use side heat exchanger primary side outlet pipe 47 communicates with the heat pump inlet pipe 41.

  Furthermore, in the hot water storage type water heater 100 of the present embodiment, the four-way valve 33 is controlled in accordance with the operation states shown in FIGS. 2 to 10 below, and the following first, second, third, and fourth It is designed to be used by switching between four channel configurations. More specifically, the “first flow path form” that can be selected by the four-way valve 33 is a flow path form (cd path) that allows the heat pump outlet pipe 42 to communicate with the upper return pipe 49. The “second flow path configuration” is a flow channel configuration (bd path) in which the bypass pipe 48 communicates with the upper return pipe 49. The “third flow path configuration” is a flow channel configuration (ba route) in which the bypass pipe 48 communicates with the lower return pipe 45. The “fourth flow path configuration” is a flow channel configuration (ca route) in which the heat pump outlet pipe 42 communicates with the lower return pipe 45.

  FIG. 2 is a circuit configuration diagram of the hot water storage type water heater 100 according to Embodiment 1 of the present invention during a boiling operation. The boiling operation (hot water storage operation) is an operation for increasing the amount of stored hot water (heat storage amount) in the hot water storage tank 10 by using the heat pump unit 60 to boil the water in the hot water storage tank 10 into hot water. During the heating operation, the first three-way valve 31 is connected so that the a port and the c port communicate with each other and the b port is closed (that is, the first flow path configuration of the first three-way valve 31 is selected. To be controlled). As a result, the tank lower pipe 40 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the user side heat exchanger 22 is shut off with the use side heat exchanger primary side outlet pipe 47 side closed. Further, during the heating operation, the four-way valve 33 is selected such that the c port and the d port are in communication and the a port and the b port are closed (that is, the first flow path configuration of the four-way valve 33 is selected. Controlled). As a result, the heat pump outlet pipe 42 and the upper return pipe 49 communicate with each other, and the flow path to the second lower port 17 of the hot water storage tank 10 is blocked with the lower return pipe 45 side and the bypass pipe 48 side closed.

  The boiling operation is performed by operating the heat source circulation pump 21 and the heat pump unit 60 in a state where the first three-way valve 31 and the four-way valve 33 are controlled as described above. As a result, the low temperature water flowing out from the first lower port 16 of the hot water storage tank 10 is guided to the heat pump unit 60 via the tank lower pipe 40, the first three-way valve 31, the heat source circulation pump 21 and the heat pump inlet pipe 41. After being heated in the boiling heat exchanger 62, it becomes high-temperature water and passes through the heat pump outlet pipe 42, the four-way valve 33, the upper return pipe 49, and the second tank upper pipe 44. It flows into the hot water storage tank 10 from the first upper port 15 and is stored. By performing such boiling operation, high temperature water is stored in the hot water storage tank 10 from the upper layer portion, and this high temperature water layer gradually thickens and is grasped by the hot water storage temperature sensor. When the amount of stored hot water (heat storage amount) in the hot water storage tank 10 exceeds a predetermined amount, the boiling operation is stopped.

  FIG. 3 is a circuit configuration diagram at the time of the bathtub heating operation by the first heat source water circulation operation in the hot water storage type hot water heater 100 according to the first embodiment of the present invention. In the first heat source water circulation operation, hot water taken out from the second upper port 18 of the hot water storage tank 10 is sent as heat source water to the use side heat exchanger 22 to exchange heat with bathtub water, and the heat source water after heat exchange is changed to the first heat source water circulation operation. In this operation, the bath water is heated by flowing into the hot water storage tank 10 from the upper port 15. During the first heat source water circulation operation, the second three-way valve 32 is configured such that the a port and the c port communicate with each other and the b port is closed (that is, the first flow path of the second three-way valve 32). Controlled so that the form is selected). As a result, the first tank upper pipe 43 and the use side heat exchanger primary side inlet pipe 46 communicate with each other, and the second tank upper pipe 44 side is closed to flow from the first upper port 15 of the hot water storage tank 10. The road is blocked. Further, the first three-way valve 31 communicates with the b port and the c port, and the a port is closed (that is, the second flow path configuration of the first three-way valve 31 is selected). To be controlled). Thereby, the use side heat exchanger primary side outlet pipe 47 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the first lower port 16 of the hot water storage tank 10 is blocked with the tank lower pipe 40 side closed. . Further, the four-way valve 33 is controlled so that the b port and the d port communicate with each other and the a port and the c port are closed (that is, the second flow path configuration of the four-way valve 33 is selected). Is done. As a result, the bypass pipe 48 and the upper return pipe 49 communicate with each other, and the flow path from the heating heat exchanger 62 is shut off with the heat pump outlet pipe 42 side and the lower return pipe 45 side closed.

  In the first heat source water circulation operation, the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 are controlled as described above to form the first heat source water circulation circuit. It is executed by operating the pump 21. As a result, the heat source water flowing out from the second upper port 18 of the hot water storage tank 10 passes through the first tank upper pipe 43, the second three-way valve 32, and the use side heat exchanger primary side inlet pipe 46. It is guided to the heat exchanger 22 and exchanges heat with the bath water to become medium-temperature water (water whose temperature has been reduced by exchanging heat with the bath water). The heat source water that has become the medium temperature water is used on the use side heat exchanger primary side outlet pipe 47, the first three-way valve 31, the heat pump inlet pipe 41, the bypass pipe 48, the four-way valve 33, the upper return pipe 49, and the second tank. It flows into the hot water storage tank 10 from the first upper port 15 via the upper pipe 44. On the other hand, in the path on the bathtub 50 side, the hot water stretched around 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 heat source water flowing on the primary side of the use side heat exchanger 22 is transmitted to the bathtub water flowing on the secondary side of the use side heat exchanger 22, and the hot water stretched in the bathtub 50 is warmed.

  In the boiling operation, the efficiency of the heat pump unit 60 decreases as the incoming water temperature to the heat pump unit 60 increases. In the first heat source water circulation operation, the intermediate temperature water is not allowed to flow into the lower region of the hot water storage tank 10, so that the temperature of the low-temperature water stored in the lower region of the hot water storage tank 10 is not increased, and the heat pump is used during the boiling operation. It becomes possible to keep the temperature of water entering the unit 60 low, and the efficiency of the boiling operation can be kept high. In the first heat source water circulation operation, the medium-temperature water returning from the use-side heat exchanger 22 flows into the hot water storage tank 10 from the first upper port 15 and is mixed with hot water stored in the upper region of the hot water storage tank 10. The medium temperature water returning from the use side heat exchanger 22 has a sufficiently higher temperature than the low temperature water supplied from the water supply pipe 2 and has a heat quantity. When the first heat source water circulation operation is performed, the medium-temperature water returning from the use-side heat exchanger 22 is mixed with the hot water stored in the upper region of the hot water storage tank 10, and the mixed hot water is supplied from the hot water supply pipe 3. Hot water can be supplied to the tip 80. For this reason, since it becomes possible to reuse the heat quantity which the inside warm water which returns from the use side heat exchanger 22 has for the hot water supply to the hot water supply destination 80, energy use efficiency can be improved. However, in the first heat source water circulation operation, the temperature of the hot water stored in the upper region of the hot water storage tank 10 is reduced, so the temperature of the heat source water flowing on the primary side of the use side heat exchanger 22 is reduced, It will cause the fall of the capability to transmit heat to the bathtub water which flows through the secondary side of the use side heat exchanger 22.

  In the hot water storage type hot water heater 100 of the present embodiment, the first upper port 15 of the hot water storage tank 10 serves as an inlet through which the heat source water in the first heat source water circulation operation and the high temperature water in the boiling operation flow into the hot water storage tank 10. And the use as an outlet for extracting hot water supplied to the hot water supply mixing valve 5 and the bath mixing valve 6, the number of hot water outlets and outlets provided in the hot water storage tank 10 can be reduced. Simplification can be achieved.

  FIG. 4 is a circuit configuration diagram at the time of a bathtub heating operation by the second heat source water circulation operation in the hot water storage type water heater 100 according to the first embodiment of the present invention. In the second heat source water circulation operation, the hot water taken out from the first upper port 15 of the hot water storage tank 10 is sent as heat source water to the use side heat exchanger 22 to exchange heat with the bath water, and the heat source water after heat exchange is changed to the first heat source water. In this operation, the bath water is heated by flowing into the hot water storage tank 10 from the second lower port 17. During the second heat source water circulation operation, the second three-way valve 32 is configured such that the b port and the c port communicate with each other and the a port is closed (that is, the second flow of the second three-way valve 32 is the second flow). Controlled so that the path configuration is selected. As a result, the second tank upper pipe 44 and the use side heat exchanger primary side inlet pipe 46 communicate with each other, and the first tank upper pipe 43 side is closed and the flow from the second upper port 18 of the hot water storage tank 10 is closed. The road is blocked. Further, the first three-way valve 31 communicates with the b port and the c port, and the a port is closed (that is, the second flow path configuration of the first three-way valve 31 is selected). To be controlled). Thereby, the use side heat exchanger primary side outlet pipe 47 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the first lower port 16 of the hot water storage tank 10 is blocked with the tank lower pipe 40 side closed. . Further, the four-way valve 33 is controlled so 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 third flow path configuration of the four-way valve 33 is selected). Is done. As a result, the bypass pipe 48 and the lower return pipe 45 communicate with each other, and the flow path from the heating heat exchanger 62 is shut off with the heat pump outlet pipe 42 side and the upper return pipe 49 side closed.

  In the second heat source water circulation operation, the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 are controlled as described above to form the second heat source water circulation circuit. It is executed by operating the pump 21. As a result, the heat source water flowing out from the first upper port 15 of the hot water storage tank 10 passes through the second tank upper pipe 44, the second three-way valve 32, and the user side heat exchanger primary side inlet pipe 46. It is guided to the heat exchanger 22 and exchanges heat with the bath water to become medium-temperature water (water whose temperature has been reduced by exchanging heat with the bath water). The heat source water that has become the intermediate temperature water is supplied via the use side heat exchanger primary side outlet pipe 47, the first three-way valve 31, the heat pump inlet pipe 41, the bypass pipe 48, the four-way valve 33, and the lower return pipe 45. It flows into the hot water storage tank 10 from the two lower ports 17. On the other hand, the operation of the path on the bathtub 50 side is the same as described above.

  In the second heat source water circulation operation, the intermediate temperature water is allowed to flow into the lower region of the hot water storage tank 10, so that the temperature of water entering the heat pump unit 60 during the boiling operation is higher than that after the first heat source water circulation operation. Higher and lower operating efficiency. However, in the second heat source water circulation operation, since the temperature of the hot water stored in the upper region of the hot water storage tank 10 is not lowered, the temperature of the heat source water flowing on the primary side of the use side heat exchanger 22 is maintained, Heat can be transferred to the bathtub water flowing on the secondary side of the use side heat exchanger 22 without causing a decrease in the heating capacity.

  FIG. 5 is a circuit configuration diagram at the time of a bathtub heating operation according to another embodiment of the second heat source water circulation operation in hot water storage type hot water heater 100 of the first embodiment of the present invention. The second heat source water circulation operation can be executed even with the circuit configuration of FIG. 5 instead of the circuit configuration shown in FIG. With another form of the second heat source water circulation operation shown in FIG. 5, the hot water taken out from the second upper port 18 of the hot water storage tank 10 is sent as heat source water to the use side heat exchanger 22 to exchange heat with the bath water, In this operation, the heat source water after heat exchange is caused to flow from the second lower port 17 into the hot water storage tank 10 to heat the bath water. When the second heat source water circulation operation is performed in another mode, the second three-way valve 32 is configured so that the a port and the c port communicate with each other and the b port is closed (that is, the second three-way valve 32). 32 so that the first channel configuration is selected). As a result, the first tank upper pipe 43 and the use side heat exchanger primary side inlet pipe 46 communicate with each other, and the second tank upper pipe 44 side is closed to flow from the first upper port 15 of the hot water storage tank 10. The road is blocked. Further, the first three-way valve 31 communicates with the b port and the c port, and the a port is closed (that is, the second flow path configuration of the first three-way valve 31 is selected). To be controlled). Thereby, the use side heat exchanger primary side outlet pipe 47 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the first lower port 16 of the hot water storage tank 10 is blocked with the tank lower pipe 40 side closed. . Further, the four-way valve 33 is controlled so 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 third flow path configuration of the four-way valve 33 is selected). Is done. As a result, the bypass pipe 48 and the lower return pipe 45 communicate with each other, and the flow path from the heating heat exchanger 62 is shut off with the heat pump outlet pipe 42 side and the upper return pipe 49 side closed.

  In another form of the second heat source water circulation operation, the second heat source water circulation circuit is formed by controlling the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 as described above. Thus, the heat source circulation pump 21 is operated. As a result, the heat source water flowing out from the second upper port 18 of the hot water storage tank 10 passes through the first tank upper pipe 43, the second three-way valve 32, and the use side heat exchanger primary side inlet pipe 46. It is guided to the heat exchanger 22 and exchanges heat with the bath water to become medium-temperature water (water whose temperature has been reduced by exchanging heat with the bath water). The heat source water that has become the intermediate temperature water is supplied via the use side heat exchanger primary side outlet pipe 47, the first three-way valve 31, the heat pump inlet pipe 41, the bypass pipe 48, the four-way valve 33, and the lower return pipe 45. It flows into the hot water storage tank 10 from the two lower ports 17. On the other hand, the operation of the path on the bathtub 50 side is the same as described above.

  FIG. 6 is a circuit configuration diagram at the time of a bathtub heating operation by the third heat source water circulation operation in the hot water storage type hot water heater 100 according to the first embodiment of the present invention. In the third heat source water circulation operation, the hot water heated by the heat pump unit 60 and taken out from the outlet of the heat pump unit 60 is sent as heat source water to the use side heat exchanger 22 to exchange heat with the bath water, and after the heat exchange. In this operation, the bath water is heated by allowing the heat source water to flow into the water inlet of the heat pump unit 60, reheating the heat source unit 60, and recirculating it. During the third heat source water circulation operation, the second three-way valve 32 is configured such that the b port and the c port communicate with each other and the a port is closed (that is, the second flow of the second three-way valve 32 is the second flow). Controlled so that the path configuration is selected. As a result, the second tank upper pipe 44 and the use side heat exchanger primary side inlet pipe 46 communicate with each other, and the first tank upper pipe 43 side is closed and the flow from the second upper port 18 of the hot water storage tank 10 is closed. The road is blocked. Further, the first three-way valve 31 communicates with the b port and the c port, and the a port is closed (that is, the second flow path configuration of the first three-way valve 31 is selected). To be controlled). Thereby, the use side heat exchanger primary side outlet pipe 47 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the first lower port 16 of the hot water storage tank 10 is blocked with the tank lower pipe 40 side closed. . Further, the four-way valve 33 is controlled so that the c port and the d port communicate with each other and the a port and the b port are closed (that is, the first flow path configuration of the four-way valve 33 is selected). Is done. As a result, the heat pump outlet pipe 42 and the upper return pipe 49 communicate with each other, and the flow path to the second lower port 17 of the hot water storage tank 10 is blocked with the lower return pipe 45 side and the bypass pipe 48 side closed.

  In the third heat source water circulation operation, the first heat source water circulation circuit is formed by controlling the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 as described above. It is executed by operating the pump 21 and the heat pump unit 60. As a result, on the circuit side that circulates the primary side of the use side heat exchanger 22, the high-temperature heat source water heated in the heat exchanger 62 for heating of the heat pump unit 60 is converted into the heat pump outlet pipe 42, the four-way valve 33, the upper part. It is led to the use side heat exchanger 22 via the return pipe 49, the second tank upper pipe 44, the second three-way valve 32, the use side heat exchanger primary side inlet pipe 46, and heat is being exchanged with the bath water. It becomes warm water (water whose temperature has dropped due to heat exchange with bathtub water). The heat source water that has become the intermediate temperature water is guided to the heat pump unit 60 via the use side heat exchanger primary side outlet pipe 47, the first three-way valve 31, and the heat pump inlet pipe 41, and is reheated and recirculated. . On the other hand, the operation of the path on the bathtub 50 side is the same as described above.

  In the third heat source water circulation operation, medium temperature water is not allowed to flow into the lower region of the hot water storage tank 10, so that the temperature of water entering the heat pump unit 60 can be kept low during the boiling operation, and the operation efficiency is kept high. The hot water stored in the upper region of the hot water storage tank 10 can be prevented from being lowered because the medium temperature water is not allowed to flow into the upper region of the hot water storage tank 10. However, at the time of the third heat source water circulation operation, the temperature of the incoming water to the heat pump unit 60 is increased, so the efficiency of the third heat source water circulation operation itself is lowered.

  In the hot water storage type water heater 100 of the present embodiment, it is not necessary to provide three or more return ports for allowing the heat source water to flow into the hot water storage tank 10, and the number of hot water outlets and outlets formed in the hot water storage tank 10 can be reduced. The manufacturing cost can be reduced.

  Further, in the hot water storage type water heater 100 of the present embodiment, the common heat source circulation pump 21 is used in any of the boiling operation, the first heat source water circulation operation, the second heat source water circulation operation, and the third heat source water circulation operation. Since hot water can be circulated, the number of necessary pumps is small, and the manufacturing cost can be reduced.

  Moreover, in the hot water storage type water heater 100 of the present embodiment, since the first upper port 15 of the hot water storage tank 10 is located higher than the second upper port 18, the following advantages can be obtained. Hot water has the property that the density increases as the temperature decreases. After the heat source water taken out from the second upper port 18 (outlet) during the first heat source water circulation operation is heat-exchanged by the use side heat exchanger 22 and the temperature is decreased, the density is increased. It flows into the hot water storage tank 10 from 15 (inlet). For this reason, by providing the first upper port 15 at a position higher than the second upper port 18, during the first heat source water circulation operation, while the heat source water flowing in from the first upper port 15 diffuses downward due to the density difference, The hot water in the hot water storage tank 10 is sufficiently mixed. Thereby, it can prevent reliably that the heat source water which flowed in from the 1st upper part opening | mouth 15 forms an intermediate temperature water layer, without mixing with the hot water in the hot water storage tank 10. FIG.

  The hot water storage type water heater 100 of the present embodiment has three types of the first, second, and third heat source water circulation operations described above as the heat source water circulation operation for circulating the heat source water for the bathtub heating operation to the use side heat exchanger 22. Can be selectively executed. When performing the bath heating operation, which of the three types of heat source water circulation operation can achieve the best mode efficiency depends on the state of the hot water storage hot water heater 100. Here, the mode efficiency indicates the ratio of the hot water supply and heat insulation load to the amount of power consumption when the hot water storage type hot water heater 100 is operated for a certain period. The controller 70 of the hot water storage type hot water heater 100 selects one of the first, second and third heat source water circulation operations based on a predetermined rule as will be described later. An appropriate heat source water circulation operation can be performed according to the state of 100 or the like. In the control unit 70, such predetermined rules are programmed and stored in advance. When performing the bathtub heating operation, the control unit 70 selects and implements one of the first, second, and third heat source water circulation operations based on the program. Thereby, the mode efficiency of the hot water storage type water heater 100 can be improved.

  For example, as a characteristic of the heat pump unit 60, there is an operation in which the amount of electric power is consumed without boiling water when the compressor 61 is started up. Therefore, in the operation in which the heat pump unit 60 is frequently started and stopped, the operation time of the compressor 61 that does not contribute to boiling of hot water as the hot water storage type hot water heater 100 increases. As a result, the mode efficiency of the hot water storage type hot water heater 100 is deteriorated.

  On the other hand, the hot water storage type hot water heater 100 of the present embodiment is configured such that the boiling operation and the three kinds of heat source water circulation operations are configured to circulate hot water using the same heat source circulation pump 21. In the case where any one of the second and third heat source water circulation operations is performed, the boiling operation cannot be performed in parallel therewith. For this reason, when the execution request | requirement of bathtub heating operation arises during execution of boiling operation, the control part 70 interrupts boiling operation and is any of 1st, 2nd, and 3rd heat source water circulation operation. Will be carried out. In addition, "when the execution request | requirement of bathtub heating operation arises" is a bathtub outlet side temperature sensor regularly during implementation of the heat retention operation which heats the temperature of the bathtub 50 to the bathtub target temperature set by the user, for example When the difference between the temperature of the bathtub 50 measured at 53 and the bathtub target temperature is greater than a predetermined value and the bathtub heating operation is automatically started, or the user instructs the remote control device to execute the bathtub heating operation. And the control unit 70 receives the execution command signal from the remote control device.

  If the first heat source water circulation operation or the second heat source water circulation operation is to be performed when a request to perform the bath heating operation occurs during the boiling operation, the operation of the heat pump unit 60 is temporarily stopped. It transfers to bathtub heating operation, and after completion | finish of bathtub heating operation, it becomes control which starts the heat pump unit 60 again as needed and continues a boiling operation. In this case, the number of times of starting and stopping the heat pump unit 60 is increased by one as a result of interruption of the bathtub heating operation during execution of the boiling operation, as compared with the case where there is no interruption of the bathtub heating operation. For this reason, it leads to the mode efficiency of the hot water storage type hot water heater 100 decreasing. In order to improve this point, in this embodiment, when the execution request | requirement of bathtub heating operation arises during execution of the boiling operation, the control part 70 gives priority and implements 3rd heat source water circulation operation. In this case, the control unit 70 switches the flow path configuration of the first three-way valve 31 and the second three-way valve 32 while continuing the operation of the heat pump unit 60, thereby performing the third heat source water circulation operation from the boiling operation. The bath is heated. And after completion | finish of a bathtub heating operation, it returns to a boiling operation by switching the flow-path form of the 1st three-way valve 31 and the 2nd three-way valve 32, continuing the driving | operation of the heat pump unit 60. As a result, even if there is an interruption of the bathtub heating operation during the boiling operation, the number of times of starting and stopping the heat pump unit 60 does not increase, so the mode efficiency of the hot water storage water heater 100 can be increased. Can be improved.

  In addition to the case of the above example, the control unit 70 can improve the mode efficiency of the hot water storage type hot water heater 100 when the execution request for the bathtub heating operation occurs, or the intention of the user. Therefore, the most appropriate operation is selected from the first, second, and third heat source water circulation operations.

  For example, the bathtub heating operation that can maximize the operation efficiency is based on the first heat source water circulation operation, but as a demerit of the first heat source water circulation operation, the hot water stored in the upper region of the hot water storage tank 10 is used. There is a point to lower the temperature. In the present embodiment, in view of this point, the control unit 70 determines the disadvantage of the first heat source water circulation operation, that is, hot water hot enough not to cause a decrease in the temperature of the hot water stored in the upper region of the hot water storage tank 10. Is stored in the hot water storage tank 10, the first heat source water circulation operation is preferentially performed when a request to perform the bathtub heating operation occurs. Thereby, driving efficiency can be improved effectively.

  Moreover, the bathtub heating operation which can make heating capacity the highest is due to the second heat source water circulation operation. For this reason, when the temperature of the bathtub 50 is significantly lower than the bathtub target temperature set based on a user's operation etc., the temperature of the bathtub 50 can be raised to the bathtub target temperature as soon as possible. In addition, it is desirable to implement the second heat source water circulation operation. In the present embodiment, in view of this point, the control unit 70 determines that the difference between the temperature of the bathtub 50 measured by the bathtub outlet-side temperature sensor 53 and the bath target temperature is equal to or greater than a predetermined value. Give priority to the second heat source water circulation operation. Thereby, even if the temperature of the bathtub 50 is significantly lower than the bathtub target temperature, the temperature of the bathtub 50 can be quickly raised to the bathtub target temperature, and convenience can be improved.

  Moreover, if the state where the second heat source water circulation operation is not performed for a long period of time, the pipe residual water inside the lower return pipe 45 and the like may remain for a long period of time, which may cause turbidity and dirt. In this embodiment, in view of this point, when starting the first heat source water circulation operation, the control unit 70 temporarily performs the second heat source water circulation operation prior to the first heat source water circulation operation. And a second control mode for starting the first heat source water circulation operation without temporarily performing the second heat source water circulation operation. For example, if the state in which the second heat source water circulation operation is not performed continues for a predetermined period or longer, the first control mode is selected, and prior to the start of the first heat source water circulation operation. It controls to implement the 2nd heat source water circulation operation temporarily. Thus, by temporarily performing the second heat source water circulation operation before the first heat source water circulation operation, the pipe residual water remaining inside the lower return pipe 45 and the like is replaced with new water. Therefore, it is possible to reliably prevent turbidity and dirt from occurring in the pipe residual water.

  On the other hand, if the second heat source water circulation operation is executed before the first heat source water circulation operation is started as described above, it also becomes a factor of performance deterioration. Therefore, when the user selects an operation mode that prioritizes performance, the control unit 70 performs the second heat source water circulation operation before starting the second control mode, that is, the first heat source water circulation operation. It is desirable to select an operation that does not go through.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 7. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. Since the hardware configuration of the hot water storage type hot water heater 100 of the second embodiment is the same as that of the first embodiment, the description thereof is omitted.

  FIG. 7 is a circuit configuration diagram at the time of hot water supply operation in hot water storage type hot water supply apparatus 100 according to Embodiment 2 of the present invention. As shown in FIG. 7, the hot water supply operation is to mix hot water (high temperature water) taken out from the first upper port 15 of the hot water storage tank 10 and low temperature water supplied by the water supply pipe 2 with the hot water supply mixing valve 5. This is an operation of supplying the hot water supply destination 80 outside the hot water storage type hot water heater 100 via the mixed hot water supply pipe 9. Although not shown, the mixed hot water supply pipe 9 is provided with a hot water supply temperature sensor and a hot water supply flow rate sensor. The target temperature of hot water supplied from the hot water supply pipe 3 is set by the user as the hot water supply temperature and stored in the control unit 70. When the hot water temperature detected by the hot water temperature sensor is lower than the hot water temperature set by the user, the control unit 70 increases the opening degree of the hot water side (hot water side) of the hot water mixing valve 5 and is set by the user. When the temperature is higher than the hot water supply temperature, the opening degree of the hot water supply mixing valve 5 is controlled so that the opening degree on the water side of the hot water supply mixing valve 5 is increased. The controller 70 can detect whether or not a hot water supply operation is being performed based on a signal from a hot water supply flow rate sensor installed in the mixed hot water supply pipe 9.

  As described above, among the first, second, and third heat source water circulation operations, the operation that affects the temperature change in the upper portion of the hot water storage tank 10 is the first heat source water circulation operation. Therefore, when the first heat source water circulation operation and the hot water supply operation are performed simultaneously, the temperature of the upper part of the hot water storage tank 10 is changed by the first heat source water circulation operation, and is detected by the hot water temperature sensor in order to follow the temperature change. The opening degree of the hot water supply mixing valve 5 must be sequentially controlled so that the hot water supply temperature coincides with the hot water supply temperature set by the user, resulting in instability of the hot water supply temperature and user discomfort. there is a possibility.

  In view of the above-described matters, in the present embodiment, the control unit 70 does not perform the first heat source water circulation operation when the execution request for the bathtub heating operation occurs during the execution of the hot water supply operation. The heat source water circulation operation or the third heat source water circulation operation is prioritized. Accordingly, it is possible to avoid the first heat source water circulation operation and the hot water supply operation from being performed at the same time, so that the hot water supply temperature to the hot water supply destination 80 can be reliably prevented from becoming unstable.

  Further, in the present embodiment, the control unit 70, when the start of the hot water supply operation is detected by the hot water supply flow rate sensor installed in the mixed hot water supply pipe 9 during the execution of the first heat source water circulation operation, The heat source water circulation operation is stopped, and the second heat source water circulation operation or the third heat source water circulation operation is performed. Accordingly, it is possible to avoid the first heat source water circulation operation and the hot water supply operation from being performed at the same time, so that the hot water supply temperature to the hot water supply destination 80 can be reliably prevented from becoming unstable.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 8. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. Since the hardware configuration of the hot water storage type hot water heater 100 of the third embodiment is the same as that of the first embodiment, the description thereof is omitted.

  FIG. 8 is a circuit configuration diagram at the time of the lower circulation operation in hot water storage type water heater 100 according to the third embodiment of the present invention. As shown in FIG. 8, in the lower circulation operation, the first three-way valve 31 communicates with the a port and the c port and the b port is closed (that is, the first three-way valve 31 Controlled so that a single channel configuration is selected. As a result, the tank lower pipe 40 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the user side heat exchanger 22 is shut off with the use side heat exchanger primary side outlet pipe 47 side closed. In the lower circulation operation, the four-way valve 33 is selected so that the a port and the c port communicate with each other and the b port and the d port are closed (that is, the fourth flow path configuration of the four-way valve 33 is selected. Controlled). Thereby, the heat pump outlet pipe 42 and the lower return pipe 45 communicate with each other, and the upper return pipe 49 side and the bypass pipe 48 side are closed, and the flow path to the first upper port 15 of the hot water storage tank 10 is blocked.

  The lower circulation operation is executed by operating the heat source circulation pump 21 in a state where the first three-way valve 31 and the four-way valve 33 are controlled as described above. As a result, the low temperature water flowing out from the first lower port 16 of the hot water storage tank 10 is guided to the heat pump unit 60 via the tank lower pipe 40, the first three-way valve 31, the heat source circulation pump 21 and the heat pump inlet pipe 41. Then, it is not heated by the heating heat exchanger 62 and flows into the hot water storage tank 10 from the second lower port 17 via the heat pump outlet pipe 42, the four-way valve 33, and the lower return pipe 45 without being heated. By performing such a lower circulation operation, freezing in the lower circulation channel (the heat pump inlet pipe 41, the heat pump outlet pipe 42, the lower return pipe 45, etc.) can be prevented. Further, by performing the lower circulation operation after the boiling operation, the boiling heat exchanger 62 can be cooled, and adhesion of calcium carbonate or the like to the boiling heat exchanger 62 can be prevented. The control unit 70 performs heat exchange for boiling when a request for performing the lower circulation operation is generated (for example, when it is determined that freezing prevention of the lower circulation channel is necessary based on the outside air temperature or the like, or after the boiling operation is completed) When it is determined that a measure for preventing the calcium carbonate from adhering to the vessel 62 is necessary), the lower circulation operation is performed.

  FIG. 9 is a circuit configuration diagram at the time of a bathtub heating operation by a second heat source water circulation operation with a lower circulation in the hot water storage type water heater 100 according to the third embodiment of the present invention. In the second heat source water circulation operation with the lower circulation, the hot water taken out from the first upper port 15 of the hot water storage tank 10 is sent as heat source water to the use side heat exchanger 22 to exchange heat with the bath water, and the heat source after heat exchange. In this operation, water is introduced into the lower circulation channel and passed through the heat pump unit 60 and then introduced into the hot water storage tank 10 from the second lower port 17 to heat the bath water. During the second heat source water circulation operation with the lower circulation, the second three-way valve 32 communicates with the b-port and the c-port so that the a-port is closed (that is, the second three-way valve 32 has a second state). Controlled so that a two-channel configuration is selected. As a result, the second tank upper pipe 44 and the use side heat exchanger primary side inlet pipe 46 communicate with each other, and the first tank upper pipe 43 side is closed and the flow from the second upper port 18 of the hot water storage tank 10 is closed. The road is blocked. The first three-way valve 31 communicates with the b port and the c port so that the a port is closed (that is, the second flow path configuration of the first three-way valve 31 is selected). Controlled). Thereby, the use side heat exchanger primary side outlet pipe 47 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the first lower port 16 of the hot water storage tank 10 is blocked with the tank lower pipe 40 side closed. . Further, the four-way valve 33 is controlled so that the a port and the c port communicate with each other and the b port and the d port are closed (that is, the fourth flow path configuration of the four-way valve 33 is selected). The Thereby, the heat pump outlet pipe 42 and the lower return pipe 45 communicate with each other, and the upper return pipe 49 side and the bypass pipe 48 side are closed, and the flow path to the first upper port 15 of the hot water storage tank 10 is blocked.

  The second heat source water circulation operation with the lower circulation is executed by operating the heat source circulation pump 21 in a state where the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 are controlled as described above. The As a result, the heat source water flowing out from the first upper port 15 of the hot water storage tank 10 passes through the second tank upper pipe 44, the second three-way valve 32, and the user side heat exchanger primary side inlet pipe 46. It is guided to the heat exchanger 22 and exchanges heat with the bath water to become medium-temperature water (water whose temperature has been reduced by exchanging heat with the bath water). The heat source water that has become the intermediate temperature water is guided to the heat pump unit 60 via the use side heat exchanger primary side outlet pipe 47, the first three-way valve 31, and the heat pump inlet pipe 41, and is heated to the heat exchanger 62 for boiling. The hot water flows into the hot water storage tank 10 from the second lower port 17 via the heat pump outlet pipe 42, the four-way valve 33, and the lower return pipe 45 without being heated.

  As described above, the hot water storage type water heater 100 of the third embodiment is configured as the second heat source water circulation operation by using the second heat source water circulation operation with the lower circulation described above (the heat source water that has passed through the use-side heat exchanger 22 as a heat pump). And the heat source water that has passed through the use-side heat exchanger 22 as shown in FIG. 4 or FIG. 5 is used as the heat pump unit 60. It is possible to selectively perform the second heat source water circulation operation without the lower circulation that flows into the hot water storage tank 10 from the second lower port 17 without passing through the second lower port 17.

  In the present third embodiment, when the execution request for the bathtub heating operation overlaps with the execution request for the lower circulation operation, the control unit 70 preferentially implements the second heat source water circulation operation with the lower circulation. To do. Thereby, at the same time as performing the bathtub heating operation, it is possible to prevent freezing in the lower circulation channel and to prevent calcium carbonate from adhering to the heating heat exchanger 62.

  FIG. 10: is a circuit block diagram at the time of the bathtub heating operation | movement by the other form of the 2nd heat source water circulation operation | movement with a lower circulation in the hot water storage type water heater 100 of Embodiment 3 of this invention. The second heat source water circulation operation with the lower circulation can be executed even with the circuit configuration of FIG. 10 instead of the circuit configuration shown in FIG. As shown in FIG. 10, in another form of the second heat source water circulation operation with the lower circulation, the hot water taken out from the second upper port 18 of the hot water storage tank 10 is sent to the use side heat exchanger 22 as the heat source water to the bathtub. After exchanging heat with water, the heat source water after the heat exchange flows into the lower circulation channel and passes through the heat pump unit 60, and then flows into the hot water storage tank 10 from the second lower port 17 to heat the bath water. This is the operation to be performed. When the second heat source water circulation operation with the lower circulation is performed, the second three-way valve 32 is configured so that the a port and the c port communicate with each other and the b port is closed (that is, the second port is closed). The first flow path configuration of the three-way valve 32 is selected. As a result, the first tank upper pipe 43 and the use side heat exchanger primary side inlet pipe 46 communicate with each other, and the second tank upper pipe 44 side is closed to flow from the first upper port 15 of the hot water storage tank 10. The road is blocked. The first three-way valve 31 communicates with the b port and the c port so that the a port is closed (that is, the second flow path configuration of the first three-way valve 31 is selected). Controlled). Thereby, the use side heat exchanger primary side outlet pipe 47 and the heat pump inlet pipe 41 communicate with each other, and the flow path from the first lower port 16 of the hot water storage tank 10 is blocked with the tank lower pipe 40 side closed. . Further, the four-way valve 33 is controlled so that the a port and the c port communicate with each other and the b port and the d port are closed (that is, the fourth flow path configuration of the four-way valve 33 is selected). The Thereby, the heat pump outlet pipe 42 and the lower return pipe 45 communicate with each other, and the upper return pipe 49 side and the bypass pipe 48 side are closed, and the flow path to the first upper port 15 of the hot water storage tank 10 is blocked.

  In another form of the second heat source water circulation operation with the lower circulation, the heat source circulation pump 21 is operated in a state where the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 are controlled as described above. Is executed. As a result, the heat source water flowing out from the second upper port 18 of the hot water storage tank 10 passes through the first tank upper pipe 43, the second three-way valve 32, and the use side heat exchanger primary side inlet pipe 46. It is guided to the heat exchanger 22 and exchanges heat with the bath water to become medium-temperature water (water whose temperature has been reduced by exchanging heat with the bath water). The heat source water that has become the intermediate temperature water is guided to the heat pump unit 60 via the use side heat exchanger primary side outlet pipe 47, the first three-way valve 31, and the heat pump inlet pipe 41, and is heated to the heat exchanger 62 for boiling. The hot water flows into the hot water storage tank 10 from the second lower port 17 via the heat pump outlet pipe 42, the four-way valve 33, and the lower return pipe 45 without being heated.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described. The difference from the first embodiment described above will be mainly described, and the same or corresponding parts will be denoted by the same reference numerals and the description thereof will be omitted. Since the hardware configuration of the hot water storage type hot water heater 100 of the fourth embodiment is the same as that of the first embodiment except for the following points, the illustration is omitted.

  In the hot water storage type water heater 100 according to the fourth embodiment, the first upper port 15 is provided at the uppermost portion of the hot water storage tank 10 and is formed to face the vertical direction or a direction close thereto. On the other hand, the second lower port 17 provided in the hot water storage tank 10 is formed so as to face a direction that is not vertical (in the illustrated configuration, a horizontal direction or a direction close thereto). In the middle of a pipe (for example, the second tank upper pipe 44) connected to the upper part of the hot water storage tank 10, air discharge means (not shown) for discharging the air (air) in the hot water storage tank 10 to the outside. Is provided. When air is mixed into the pipe communicating with the hot water storage tank 10, the hot water in the pipe is circulated and the air flows into the hot water storage tank 10, so that the air rises in the hot water storage tank 10 and the hot water storage tank 10. Can be discharged to the outside from the air discharge means. The control unit 70 also includes a first tank upper pipe 43, a second tank upper pipe 44, a use side heat exchanger primary side inlet pipe 46, a use side heat exchanger primary side outlet pipe 47, and an upper return pipe 49. An air detection means capable of detecting that air has been mixed therein is provided. As an air detection method, for example, in the air detection means provided in the control unit 70, a flow rate such as a circulation flow rate in the pipe is constantly monitored, and the control unit 70 instructs the heat source circulation pump 21 to set a certain number of rotations. If the flow rate fluctuates greatly so that it exceeds the specified range, it is assumed that air has entered the piping and the flow rate has become unstable. Is possible.

  Of the first, second, and third heat source water circulation operations, the most suitable reason for performing air venting that discharges air mixed in the pipe communicating with the hot water storage tank 10 from the air discharging means is as follows. Therefore, it is the second heat source water circulation operation. As described above, in order to release air, it is necessary to cause air to flow into the hot water storage tank 10 by circulating hot water in the pipe. For this reason, the third heat source water circulation operation in which the hot water storage tank 10 is not included in the circulation path is inappropriate. In the first heat source water circulation operation, hot water (heat source water) flows into the hot water storage tank 10 from the first upper port 15, but the first upper port 15 faces in the vertical direction. The inside of the mouth 15 rises against the flow of hot water, and the air hardly flows into the hot water storage tank 10. On the other hand, in the second heat source water circulation operation, hot water (heat source water) flows into the hot water storage tank 10 from the second lower port 17, but the second lower port 17 does not face in the vertical direction, so the air is hot water. And flows into the hot water storage tank 10 from the second lower port 17 without fail. In view of the above matters, in the fourth embodiment, the control unit 70 is a case where air mixing is detected by the air detection means, or a case where a forced air removal operation command is received, and the bathtub When the execution request for the heating operation occurs, the second heat source water circulation operation is preferentially performed. Thereby, the air mixed in the pipe can surely flow into the hot water storage tank 10 and be discharged from the air discharge means to the outside.

1 hot water storage unit, 2 water supply piping, 3 hot water supply piping, 4 pressure reducing valve, 5 hot water supply mixing valve,
6 bath mixing valve, 9 mixing hot water supply piping, 10 hot water storage tank, 14 water supply port,
15 First upper port, 16 First lower port, 17 Second lower port, 18 Second upper port,
21 heat source circulation pump, 22 utilization side heat exchanger, 31 first three-way valve,
32 Second three-way valve, 33 Four-way valve, 40 Tank lower piping,
41 Heat pump inlet piping, 42 Heat pump outlet piping, 43 Tank upper piping,
44 Tank upper piping, 45 Lower return piping, 46 User side heat exchanger primary side inlet piping,
47 Use side heat exchanger primary side outlet piping, 48 bypass piping, 49 upper return piping,
50 bathtub, 51 bathtub water circulation circuit, 52 secondary side circulation pump,
53 Bath outlet side temperature sensor, 60 Heat pump unit, 61 Compressor,
62 heat exchanger for boiling, 63 expansion valve, 64 air heat exchanger,
65 Working medium circulation piping, 70 control unit, 80 hot water supply destination, 100 hot water storage type hot water supply machine

Claims (10)

Heating means capable of generating water by heating water;
A hot water storage tank capable of storing the upper layer side water and the lower layer side water in a stacked state;
A heat exchanger for heating the object to be heated by exchanging heat with the heat source water;
A first heat source water circulation operation is performed in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger flows into the upper region of the hot water storage tank. Means to do,
A second heat source water circulation operation in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. Means to do,
Hot water generated by heating by the heating means is sent to the heat exchanger as the heat source water, and the third heat source water circulation operation is performed in which the heat source water that has passed through the heat exchanger is sent to the heating means and recirculated. Means,
When performing the heating operation of heating the object to be heated by sending the heat source water to the heat exchanger, the first heat source water circulation operation, the second heat source water circulation operation, the third heat source water operation according to a predetermined rule. A control means for selecting and implementing any one of the heat source water circulation operations;
Equipped with a,
A hot water supply operation of sending hot water taken out from the upper region of the hot water storage tank to a hot water supply destination can be performed,
Said control means, said when the execution request of the heating operation occurs during the execution of the hot water supply operation, the second heat source water circulation operation or the third heat source water circulation operation you performed preferentially hot water storage type hot water supply Machine. Heating means capable of generating water by heating water;
A hot water storage tank capable of storing the upper layer side water and the lower layer side water in a stacked state;
A heat exchanger for heating the object to be heated by exchanging heat with the heat source water;
A first heat source water circulation operation is performed in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger flows into the upper region of the hot water storage tank. Means to do,
A second heat source water circulation operation in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. Means to do,
Hot water generated by heating by the heating means is sent to the heat exchanger as the heat source water, and the third heat source water circulation operation is performed in which the heat source water that has passed through the heat exchanger is sent to the heating means and recirculated. Means,
When performing the heating operation of heating the object to be heated by sending the heat source water to the heat exchanger, the first heat source water circulation operation, the second heat source water circulation operation, the third heat source water operation according to a predetermined rule. A control means for selecting and implementing any one of the heat source water circulation operations;
With
A hot water supply operation of sending hot water taken out from the upper region of the hot water storage tank to a hot water supply destination can be performed,
When the hot water supply operation is started during the execution of the first heat source water circulation operation, the control means stops the first heat source water circulation operation and performs the second heat source water circulation operation or the third heat source water circulation operation. savings hot water heater implement the heat source water circulation operation. Heating means capable of generating water by heating water;
A hot water storage tank capable of storing the upper layer side water and the lower layer side water in a stacked state;
A heat exchanger for heating the object to be heated by exchanging heat with the heat source water;
A first heat source water circulation operation is performed in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger flows into the upper region of the hot water storage tank. Means to do,
A second heat source water circulation operation in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. Means to do,
Hot water generated by heating by the heating means is sent to the heat exchanger as the heat source water, and the third heat source water circulation operation is performed in which the heat source water that has passed through the heat exchanger is sent to the heating means and recirculated. Means,
When performing the heating operation of heating the object to be heated by sending the heat source water to the heat exchanger, the first heat source water circulation operation, the second heat source water circulation operation, the third heat source water operation according to a predetermined rule. A control means for selecting and implementing any one of the heat source water circulation operations;
Means for performing a lower circulation operation for returning water taken out from the lower area of the hot water storage tank to the lower area of the hot water storage tank via the heating means ;
With
In the second heat source water circulation operation, the second heat source water circulation operation without lower circulation that allows the heat source water that has passed through the heat exchanger to flow into the lower region of the hot water storage tank without passing through the heating means, A second heat source water circulation operation with a lower circulation that allows the heat source water that has passed through a heat exchanger to flow into the lower region of the hot water storage tank after passing through the heating means,
Wherein, when said heating operation execution request to have both the above-described requirements of lower circulation operation, savings hot water heater you performed preferentially a second heat source water circulation operation with the lower circulation . Heating means capable of generating water by heating water;
A hot water storage tank capable of storing the upper layer side water and the lower layer side water in a stacked state;
A heat exchanger for heating the object to be heated by exchanging heat with the heat source water;
A first heat source water circulation operation is performed in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger flows into the upper region of the hot water storage tank. Means to do,
A second heat source water circulation operation in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. Means to do,
Hot water generated by heating by the heating means is sent to the heat exchanger as the heat source water, and the third heat source water circulation operation is performed in which the heat source water that has passed through the heat exchanger is sent to the heating means and recirculated. Means,
When performing the heating operation of heating the object to be heated by sending the heat source water to the heat exchanger, the first heat source water circulation operation, the second heat source water circulation operation, the third heat source water operation according to a predetermined rule. A control means for selecting and implementing any one of the heat source water circulation operations;
Air discharge means for discharging air in the hot water storage tank;
An air detection means capable of detecting that air is mixed in the pipe communicating with the hot water storage tank;
With
The control means is a case where the air detection means detects that air is mixed in, or a case where a forced air removal operation command is received, and a request to perform the heating operation is generated. savings hot water heater performed preferentially a second heat source water circulation operation. Heating means capable of generating water by heating water;
A hot water storage tank capable of storing the upper layer side water and the lower layer side water in a stacked state;
A heat exchanger for heating the object to be heated by exchanging heat with the heat source water;
A first heat source water circulation operation is performed in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger flows into the upper region of the hot water storage tank. Means to do,
A second heat source water circulation operation in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. Means to do,
Hot water generated by heating by the heating means is sent to the heat exchanger as the heat source water, and the third heat source water circulation operation is performed in which the heat source water that has passed through the heat exchanger is sent to the heating means and recirculated. Means,
When performing the heating operation of heating the object to be heated by sending the heat source water to the heat exchanger, the first heat source water circulation operation, the second heat source water circulation operation, the third heat source water operation according to a predetermined rule. A control means for selecting and implementing any one of the heat source water circulation operations;
First flow path switching means;
A second flow path switching means;
A third flow path switching means;
A first upper port and a second upper port provided in the upper region of the hot water storage tank;
A first lower port and a second lower port provided in a lower region of the hot water storage tank;
A heat source circulation pump for circulating hot water,
The first lower port, the first flow path switching means, the heat source circulation pump, the water inlet of the heating means, the hot water outlet of the heating means, the third flow path switching means, The water taken out from the hot water storage tank through the first lower port by forming a boiling circuit by sequentially connecting the first upper port and operating the heating means and the heat source circulation pump. Means for performing a boiling operation in which hot water generated by being heated by the heating means and flowing into the hot water storage tank from the first upper port,
With
In the first heat source water circulation operation, the second upper port, the second flow path switching means, the heat source water inlet of the heat exchanger, the heat source water outlet of the heat exchanger, A first heat source water circulation circuit is formed by sequentially connecting the first flow path switching means, the heat source circulation pump, the third flow path switching means, and the first upper port, and the heat source An operation in which a circulation pump is operated to circulate the heat source water;
The second heat source water circulation operation includes the second upper port or the first upper port, the second flow path switching unit, the heat source water inlet of the heat exchanger, and the heat exchanger of the heat exchanger. A second heat source water circulation circuit is formed by sequentially connecting an outlet of the heat source water, the first flow path switching means, the heat source circulation pump, the third flow path switching means, and the second lower port. The heat source circulation pump is operated to circulate the heat source water,
The third heat source water circulation operation includes a hot water outlet of the heating means, the third flow path switching means, the second flow path switching means, an inlet of the heat source water of the heat exchanger, A third heat source water circulation circuit is formed by sequentially connecting an outlet of the heat source water of the heat exchanger, the first flow path switching means, the heat source circulation pump, and a water inlet of the heating means, savings hot water heater operating Ru der for circulating the heating means and the heat source water by operating the heat source circulating pump. Heating means capable of generating water by heating water;
A hot water storage tank capable of storing the upper layer side water and the lower layer side water in a stacked state;
A heat exchanger for heating the object to be heated by exchanging heat with the heat source water;
A first heat source water circulation operation is performed in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger flows into the upper region of the hot water storage tank. Means to do,
A second heat source water circulation operation in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. Means to do,
Hot water generated by heating by the heating means is sent to the heat exchanger as the heat source water, and the third heat source water circulation operation is performed in which the heat source water that has passed through the heat exchanger is sent to the heating means and recirculated. Means,
When performing the heating operation of heating the object to be heated by sending the heat source water to the heat exchanger, the first heat source water circulation operation, the second heat source water circulation operation, the third heat source water operation according to a predetermined rule. A control means for selecting and implementing any one of the heat source water circulation operations;
With
The control means, when starting the first heat source water circulation operation, a control mode for starting the first heat source water circulation operation after temporarily performing the second heat source water circulation operation prior to the first heat source water circulation operation; savings hot water heater that having a control mode for starting the first heat source water circulation operation without to implement the second heat source water circulation operation. Heating means capable of generating water by heating water;
A hot water storage tank capable of storing the upper layer side water and the lower layer side water in a stacked state;
A heat exchanger for heating the object to be heated by exchanging heat with the heat source water;
A first heat source water circulation operation is performed in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water, and the heat source water that has passed through the heat exchanger flows into the upper region of the hot water storage tank. Means to do,
A second heat source water circulation operation in which hot water taken out from the upper region of the hot water storage tank is sent to the heat exchanger as the heat source water and the heat source water that has passed through the heat exchanger flows into the lower region of the hot water storage tank. Means to do,
Hot water generated by heating by the heating means is sent to the heat exchanger as the heat source water, and the third heat source water circulation operation is performed in which the heat source water that has passed through the heat exchanger is sent to the heating means and recirculated. Means,
When performing the heating operation of heating the object to be heated by sending the heat source water to the heat exchanger, the first heat source water circulation operation, the second heat source water circulation operation, the third heat source water operation according to a predetermined rule. A control means for selecting and implementing any one of the heat source water circulation operations;
With
The position of the inlet through which the heat source water that has passed through the heat exchanger in the first heat source water circulation operation flows into the hot water storage tank is an outlet that takes out the heat source water from the hot water storage tank in the first heat source water circulation operation. position near higher than the position of Ru savings hot water heater. A means for performing a boiling operation in which water taken out from a lower region of the hot water storage tank is sent to the heating unit, and hot water generated by heating by the heating unit flows into the upper region of the hot water storage tank;
Wherein, when the execution request of the heating operation during the execution of the boiling operation occurs, any one of claims 1 to 7 carried out preferentially the third heat source water circulation operation Hot water storage water heater. Temperature detecting means for detecting the temperature of the object to be heated;
Means for setting a target temperature of the object to be heated;
With
The control means prioritizes the second heat source water circulation operation when the difference between the target temperature and the temperature of the heated object detected by the temperature detection means is a predetermined value or more. The hot water storage type water heater according to any one of claims 1 to 8 .   The hot water storage type hot water heater according to any one of claims 1 to 9, wherein the heat exchanger heats bathtub water stored in a bathtub as the object to be heated.

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