JP6237452B2 - Water heater - Google Patents

Description

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

  2. Description of the Related Art Conventionally, as a water heater, there is one provided with a heat pump device corresponding to a heating means and a hot water storage tank as disclosed in Patent Document 1, for example. This type of hot water heater can store hot water in the hot water storage tank by performing a boiling operation in which hot water in the hot water storage tank flows into the heating means and is converted into hot water by the heating means and returned to the hot water storage tank. The hot water in the hot water storage tank is used for refilling the bathtub and reheating the hot water in the bathtub. In addition, if the hot water in the hot water storage tank cannot be used for reheating operation because the temperature of the hot water in the hot water storage tank is lowered, the hot water boiled by the heating means is used as it is. It is possible to perform a reheating operation in which hot water that has become low in temperature is heated again to high-temperature hot water by a heating means and circulated.

JP 2004-205140 A

  In the reheating operation using the heating means as in Patent Document 1, the amount of heat to be heated by the heating means and the amount of heat radiated from the hot water in the bathtub are often larger. In this case, in the bathtub Even if the temperature of the hot water reaches the set temperature, there will be a problem that the temperature continues to rise. With respect to this problem, Patent Document 1 avoids this by stopping the operation of the heating means and operating the heating means again when the temperature of the hot water in the bathtub decreases. However, in the method of Patent Document 1, the operation of the heating unit frequently starts and stops. While the operation of the heating unit is stopped, the temperature of the heating unit itself is lowered, and when the operation of the heating unit is resumed, an amount of heat for reheating the heating unit itself is required. Therefore, frequent starting and stopping of the heating means has been a factor of lowering COP (energy consumption efficiency). In particular, when the heating means is a heat pump, there is a considerable amount of time from the start of the heat pump to the amount of heat required for the follow-up operation, so the COP is significantly reduced.

  The present invention has been made in view of the above, and an object of the present invention is to provide a hot water storage type hot water heater having a high COP by suppressing frequent start and stop of the heating means.

The hot water supply apparatus of the present invention is supplied with heating means for heating and flowing out the flowing heat source side hot water, heat source side hot water heated by the heating means from the upper part, and water serving as the heat source side hot water from the lower part. The hot water storage tank, the hot water on the heat source side heated by the heating means, and the hot water on the usage side flow in, and the hot water on the heat source side that performs the heat exchange with the hot water on the usage side is stored in the hot water storage tank. The first inlet into which the heat-source-side hot water is introduced, the second inlet into which the heat-source-side hot water that has flowed out from the use-side heat exchanger flows, and the heat-source-side hot water that has flowed in from the first inlet and the second inlet A flow rate adjusting means having a flow outlet to the heating means, a usage side temperature sensor for measuring the temperature of the usage side hot water before flowing into the usage side heat exchanger, and a first inlet of the flow rate adjustment means . By controlling the opening and the opening of the second inlet, A heat source side hot water flowing out from the heat means, and a control device capable of adjusting a flow rate flowing into the use side heat exchanger and a flow rate flowing into the hot water storage tank. A preset temperature of hot water, a first threshold temperature set to a temperature lower than the set temperature, and a second threshold temperature set to a temperature equal to or higher than the set temperature are preset, The control device controls the flow rate adjusting means so that the heat source side hot water heated by the heating means flows into the usage side heat exchanger when the measurement temperature of the usage side temperature sensor is equal to or lower than the first threshold temperature, When the temperature measured by the use side temperature sensor is higher than the first threshold temperature and lower than the second threshold temperature, the heat source side hot water heated by the heating means flows into both the use side heat exchanger and the hot water storage tank. Control the flow rate adjustment means so that the measured temperature of the user side temperature sensor There the case of more than the second threshold temperature, heated by a heating means heat source side hot water to control the flow rate adjusting means so as to flow into the hot water storage tank.

  In the hot water supply apparatus according to the present invention, the hot water flowing out from the heating means is used when the temperature of the use side hot water before flowing into the use side heat exchanger measured by the use side temperature sensor is equal to or lower than the first threshold temperature. Controls to flow into the use side heat exchanger, and controls to flow into both the use side heat exchanger and the hot water storage tank when the temperature is higher than the first threshold temperature and lower than the second threshold temperature. When the temperature is equal to or higher than the second threshold temperature, control is performed so as to flow into the hot water storage tank, so that the heating amount to the user-side hot water can be adjusted without starting and stopping the heating means. The loss due to the water can be reduced, and the COP of the water heater can be improved.

1 is a configuration diagram of a water heater according to Embodiment 1. FIG. It is a block diagram at the time of the boiling independent operation | movement of the water heater based on Embodiment 1. FIG. It is a block diagram at the time of the reheating independent operation of the water heater based on Embodiment 1. FIG. It is a block diagram at the time of simultaneous boiling-up and reheating operation of the water heater according to the first embodiment. 1 is a block diagram of a water heater according to Embodiment 1. FIG. 3 is a flowchart of automatic operation control of a water heater according to Embodiment 1. 6 is a flowchart of automatic operation control of a water heater according to a first modification of the first embodiment. It is a flowchart of the automatic operation control of the water heater which concerns on the 2nd modification of Embodiment 1. FIG. 6 is a graph showing the relationship between the ratio of the flow rate flowing from the heating unit 10 to the use side heat exchanger 24 and the use side temperature T in the second embodiment. 6 is a graph showing a relationship between a ratio of a flow rate flowing from the heating unit 10 to the use side heat exchanger 24 and a use side temperature T in a modification of the second embodiment.

  Hereinafter, the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

Embodiment 1
FIG. 1 is a configuration diagram of a water heater according to the present invention. First, the overall configuration of the water heater 1 will be described. The water heater 1 includes a heating unit 10 (corresponding to the heating means of the present invention) that boils the heat source side hot water circulating in the water heater 1, a tank unit 20 that stores the heat source side hot water, and the water heater 1 such as the hot water temperature. And a remote controller 21 that allows a user to input a setting change or driving operation command. The heating unit 10 and the tank unit 20 are connected to the heating unit outgoing pipe 40, the heating unit return pipe 41, and electrical wiring (not shown). Further, the tank unit 20 is connected to the bathtub 60 by a use side forward pipe 42 and a use side return pipe 43. The hot water in the bathtub 60 corresponds to the use-side hot water of the present invention. Furthermore, the remote controller 21 is connected to a control device 22 built in the tank unit 20 so as to be communicable.

  Next, the heating unit 10 will be described. Inside the heating unit 10, a heat pump cycle in which the compressor 11, the heating heat exchanger 12, the expansion valve 13, and the air heat exchanger 14 are annularly connected by a refrigerant pipe 15 and the refrigerant circulates is configured. . The boiling heat exchanger 12 is formed with a flow path having one end connected to the heating unit outgoing pipe 40 and the other end connected to the heating unit return pipe 41. Heat source side hot water flows from the heating unit forward pipe 40 to the flow path of the heat exchanger 12 for boiling, and the heat source side hot water is heated by exchanging heat with the refrigerant having high temperature and high pressure by the compressor 11.

  Next, the tank unit 20 will be described. The tank unit 20 is provided with a hot water storage tank 23 for storing the heat source side hot water. A water inlet 23a is provided at the lower part of the hot water storage tank 23 to allow water supplied from a water source such as a water supply to flow into the lower part of the hot water storage tank 23 as hot water on the heat source side. In addition, a hot water inflow / outflow port 23 d is provided at the upper part of the hot water storage tank 23 to allow the heat source side hot water heated by the heating unit 10 to flow into the hot water storage tank 23 or to flow out the heat source side hot water above the hot water storage tank 23. . The water supplied from the water source flows into the hot water storage tank 23 from the lower part, and the hot water on the heat source side heated by the heat source unit 10 flows from the upper part, so that a high temperature heat source side hot water layer is formed on the upper part. The heat source side hot water is stored so that a low temperature heat source side hot water layer is formed. A plurality of tank temperature sensors 23e connected to the controller 22 are attached to the surface of the hot water storage tank 23 at different heights. The control device 22 can detect the temperature distribution of the heat source side hot water in the hot water storage tank 23 by a plurality of tank temperature sensors 23e. Based on this temperature distribution, the remaining hot water amount of the hot heat source side hot water in the hot water storage tank 23 can be determined. I can grasp it.

  A water outlet 23 b through which the heat source side hot water stored in the lower part of the hot water storage tank 23 flows out to the heating unit 10 is provided at the lower part of the hot water storage tank 23. Further, between the central portion and the lower portion of the hot water storage tank 23, a medium temperature water inlet 23 c for allowing the heat source side hot water heated by the heating unit 10 to flow into the hot water storage tank 23 is provided.

  In the tank unit 20, a use-side heat exchanger 24 that heats the hot water in the bathtub 60 using the heat source-side hot water boiled by the heating unit 10 is provided. The use-side heat exchanger 24 includes two independent flow paths, and performs heat exchange between hot water flowing in the respective flow paths. In the present invention, the hot water on the heat source side in the tank unit 20 flows through one flow path, and the hot water in the bathtub 60 that is the use side hot water flows through the other flow path. The hot water in the bathtub 60 is configured to be heated by exchanging heat with the hot water in the bathtub 60.

  Next, the piping in the tank unit 20 will be described. First, in the tank unit 20, a water supply pipe 44 is configured to allow water supplied from a water source such as a water supply to flow into the tank unit 20. The water supply pipe 44 has a first water supply pipe 44 a having one end connected to the water source and the other end connected to the pressure reducing valve 25, and one end connected to the pressure reducing valve 25 and the other end branched to the hot water supply mixing valve 26. The second water supply pipe 44b is connected to the use-side mixing valve 27, and the third water supply pipe 44c has one end connected to the pressure reducing valve 25 and the other end connected to the water inlet 23a of the hot water storage tank 23. . Therefore, the water supplied from the water source flows into the first water supply pipe 44a from the water source, passes through the first water supply pipe 44a, is regulated to a predetermined water pressure by the pressure reducing valve 25, and passes through the third water supply pipe 44c. It flows into the lower part of the hot water storage tank 23.

  The tank unit 20 has a three-way valve 28 (corresponding to the flow rate adjusting means of the present invention). The three-way valve 28 has a first inlet (a port) and a second inlet (b port) through which the heat source side hot water flows, and an outlet (c port) through which the heat source side hot water flows out. It is possible to adjust the opening degree of the first inlet and the second inlet. Therefore, the three-way valve 28 is configured to be able to adjust the ratio of the flow rate flowing from the first inlet to the outlet and the flow rate flowing from the second inlet to the outlet. Note that the three-way valve 28 can set the respective opening degrees of the first inlet and the second inlet to 0, that is, can close the first inlet and the second inlet, respectively. The first inlet of the three-way valve 28 is connected to the water outlet 23 b via the water outlet pipe 45. Further, the second inlet of the three-way valve 28 is connected to a flow path through which the heat source side hot water of the use side heat exchanger 24 flows via the hot water outflow pipe 46. Further, the outlet of the three-way valve 28 is connected to the heating unit 10 via the heating unit outgoing pipe 40.

  A heat source pump 29 is installed in the tank unit 20 and in the middle of the heating unit outgoing pipe 40. The suction port of the heat source pump 29 is connected to the outlet side of the three-way valve 28, and the discharge port is connected to the heating unit 10 side. That is, the heat source pump 29 is provided so that the heat source side hot water in the heating unit outgoing pipe 40 flows from the outlet of the three-way valve 28 to the heating unit 10.

  Further, the tank unit 20 has a four-way valve 30. The four-way valve 30 includes a first inlet (b port) and a second inlet (c port) into which the heat source side hot water flows, and a first outlet (a port) and a second flow from which the heat source side hot water flows out. A channel (b-a channel) connecting the first inlet and the first outlet, and a channel (b-d) connecting the first inlet and the second outlet. Channel), a channel connecting the second inlet and the first outlet (ca channel), and a channel connecting the second inlet and the second outlet (cd channel), respectively. It is configured to be possible. The first inlet of the four-way valve 30 is connected to the heating unit 10 via the heating unit return pipe 41. The second inflow port of the four-way valve 30 is connected to a portion closer to the heating unit 10 than the heat source pump 29 of the heating unit forward piping 40 via the first bypass piping 47. The first outlet of the four-way valve 30 is connected to the intermediate temperature water inlet 23 c of the hot water storage tank 23 via the second bypass pipe 48. The second outlet of the four-way valve 30 is connected to the hot water inlet / outlet 23 d via a hot water supply pipe 49.

  In the middle of the hot water supply pipe 49, a branch point connected to the hot water inflow pipe 50 and a branch point connected to the first hot water supply pipe 51 are provided. One end of the hot water inflow pipe 50 is connected to the hot water supply pipe 49, and the other end is connected to a flow path through which the heat source side hot water of the use side heat exchanger 24 flows, and the hot water outflow pipe is connected via the use side heat exchanger 24. 46. Further, one end of the first hot water supply pipe 51 is connected to the hot water supply pipe 49, and the other end is branched and connected to the hot water supply mixing valve 26 and the use side mixing valve 27, respectively.

  The hot water supply mixing valve 26 and the use side mixing valve 27 adjust the flow rate ratio between the water supplied from the water source flowing in from the second water supply pipe 44 b and the heat source side hot water flowing in from the first hot water supply pipe 51. Adjustment is performed, and the temperature-adjusted heat source side hot water is allowed to flow out from each outlet. The heat source side hot water flowing out from the outlet of the hot water supply mixing valve 26 is supplied via the second hot water supply pipe 52 to the faucet 31 to which a pipe directed to a shower or a currant is connected. Further, the heat source side hot water discharged from the outlet of the use side mixing valve 27 is supplied to the bathtub 60 as the use side hot water via the third hot water supply pipe 53 and the use side forward pipe 42. In the middle of the third hot water supply pipe 53, a use side flow rate sensor 32 for detecting the flow rate of the heat source side hot water passing through the third hot water supply pipe 53 and a use side solenoid valve 33 for opening and closing the third hot water supply pipe 53 are provided. ing.

  One end of the use side forward pipe 42 is different from the flow path through which the use side hot water of the use side heat exchanger 24 flows, that is, the flow path connected to the hot water outflow pipe 46 and the hot water inflow pipe 50. It is connected to the flow path. The other end of the use side outgoing pipe 42 is connected to the bathtub 60. One end of the use side return pipe 43 is connected to the bathtub 60, and the other end is connected to a flow path to which the use side forward pipe 42 of the use side heat exchanger 24 is connected. Further, in the middle of the use side return pipe 43, a use side circulation pump for circulating hot water in the bathtub 60 in the order of the bathtub 60, the use side return pipe 43, the use side heat exchanger 24, the use side forward pipe 42, and the bathtub 60. 34 is provided. Further, a use side forward temperature sensor 35 for measuring the temperature of hot water in the bathtub 60 after flowing out from the use side heat exchanger 24 is provided in the middle of the use side return pipe 42, and in the middle of the use side return pipe 43. Is provided with a use-side return temperature sensor 36 (corresponding to the use-side temperature sensor of the present invention) for detecting the temperature of hot water in the bathtub 60 before flowing into the use-side heat exchanger 24. In addition, the utilization side return temperature sensor 36 should just be able to detect the temperature of the bathtub 60 before flowing in into the utilization side heat exchanger 24, for example, is provided in the bathtub 60 and may measure the temperature of the bathtub 60 directly. .

  Next, the operating state of the water heater 1 will be described. The water heater 1 according to the present invention can switch at least three types of operation states, that is, a single heating operation, a single heating operation, and a simultaneous boiling and reheating operation. These three types of operation are switched by the three-way valve 28 and the four-way valve 30. In addition, in FIGS. 2-4 which shows the driving | running state of the water heater 1, the piping through which the heat source side hot water flows is shown with the thick continuous line rather than other piping.

  FIG. 2 is a configuration diagram of the hot water heater according to the present invention during a single heating operation. In the case of the boiling-only operation, the three-way valve 28 sets the ratio of the flow rate flowing from the first inlet to the outlet to 100% and the ratio of the flow rate flowing from the second inlet to the outlet 0%. That is, the three-way valve 28 is in a state where the first inlet is communicated with the outlet and the second inlet is closed. In the four-way valve 30, a flow path connecting the first inlet and the second outlet is selected, and the second inlet and the first outlet are closed. Further, at the time of the boiling-only operation, at least the heating unit 10 and the heat source pump 29 are operating.

  During the boiling-only operation, the hot water on the heat source side stored in the lower part of the hot water storage tank 23 flows out of the hot water storage tank 23 from the water outlet 23b, the water outlet pipe 45, the three-way valve 28, the heating unit outgoing pipe 40, It flows into the heating heat exchanger 12 in the heating unit 10 via the heat source pump 29. The heat source side hot water is heated by the boiling heat exchanger 12. The heated hot water on the heat source side flows into the hot water storage tank 23 from the hot water inlet / outlet 23 d through the heating unit return pipe 41, the four-way valve 30, and the hot water supply pipe 49, and is stored in the upper part of the hot water storage tank 23. By performing the boiling single operation in this way, the lower temperature heat source side hot water flows out into the hot water storage tank 23 and the high temperature heat source side hot water flows into the upper portion, so the layer of the high temperature heat source side hot water is thicker. As a result, the low temperature heat source side hot water layer becomes thinner.

  FIG. 3 is a configuration diagram of the hot water supply apparatus according to the present invention during a single-run operation. In the case of the reheating independent operation, the three-way valve 28 sets the ratio of the flow rate flowing from the first inlet to the outlet to 0% and the ratio of the flow rate flowing from the second inlet to the outlet 100%. That is, the three-way valve 28 is in a state where the second inlet is communicated with the outlet and the first inlet is closed. In the four-way valve 30, a flow path connecting the first inlet and the second outlet is selected, and the second inlet and the first outlet are closed. In addition, the heating unit 10, the heat source pump 29, and the use side circulation pump 34 are operating during the reheating independent operation.

  During the reheating independent operation, the hot water in the bathtub 60 is circulated by the use side circulation pump 34 via the use side return pipe 43, the use side heat exchanger 24, and the use side forward pipe 42. Moreover, the heat source side hot water heated by the boiling heat exchanger 12 passes through the heating unit return pipe 41, the four-way valve 30, the hot water supply pipe 49, and the hot water inflow pipe 50. Flow into. Therefore, the hot water in the bathtub 60 flowing through the use side heat exchanger 24 is warmed by the heat source side hot water heated by the boiling heat exchanger 12, and the hot water in the bathtub 60 is replenished. The heat-source-side hot water that has been subjected to heat exchange in the use-side heat exchanger 24 decreases in temperature and becomes medium-temperature water, and flows out from the use-side heat exchanger 24. The heat source side hot water that has flowed out flows into the heat exchanger 12 for boiling through the hot water outflow pipe 46, the three-way valve 28, the heating unit forward pipe 40, and the heat source pump 29, and is heated again. In this way, since the medium-temperature water is caused to flow again into the boiling heat exchanger 12, the hot water on the heat source side that has exchanged heat with the boiling heat exchanger 12 does not flow into the lower part of the hot water storage tank 23, and the boiling-only operation is performed. It is possible to keep the temperature of the heat source side hot water at the lower part of the hot water storage tank 23 heated by the heating unit 10 at the time, and it is possible to keep the operating efficiency of the boiling single operation high. In addition, since the purpose of the reheating independent operation is to increase the temperature of the use-side hot water, that is, the temperature of the hot water in the bathtub 60, the use-side heat exchanger 24 generates more heat than the heat radiated from the hot water in the bathtub 60. It is necessary to give the hot water of the bathtub 60 more.

  FIG. 4 is a configuration diagram of the water heater according to the present invention at the time of simultaneous boiling and reheating operation. In the case of simultaneous heating and reheating operation, the three-way valve 28 adjusts the flow rate flowing from the first inlet to the outlet and the flow rate flowing from the second inlet to the outlet to a predetermined ratio. That is, the three-way valve 28 is in a state where both the first inlet and the second inlet communicate with the outlet. In the four-way valve 30, a flow path connecting the first inlet and the second outlet is selected, and the second inlet and the first outlet are closed. In addition, the heating unit 10, the heat source pump 29, and the use side circulation pump 34 are operating at the time of simultaneous boiling-up and reheating operation.

  During simultaneous boiling and reheating operation, the hot water on the heat source side stored in the lower part of the hot water storage tank 23 flows out of the hot water storage tank 23 from the water outlet 23b, and passes through the water outlet pipe 45 to the first inlet of the three-way valve 28. More inflows. Further, since the heat source side hot water flowing out from the use side heat exchanger 24 flows into the second inlet of the three-way valve 28, the heat source side hot water flowing in from the first inlet and the heat source side hot water flowing out from the outlet of the three way valve 28 are connected to the second inlet. Heat source side hot water flowing in from the two inlets is mixed and flows out. The hot water on the heat source side flowing out from the outlet of the three-way valve 28 flows into the heating heat exchanger 12 in the heating unit 10 via the heating unit outgoing pipe 40 and the heat source pump 29, and is heated in the heating heat exchanger 12. 12 is heated. The hot water on the heat source side heated by the boiling heat exchanger 12 flows to the hot water supply pipe 49 through the heating unit return pipe 41 and the four-way valve 30. In the middle of the hot water supply pipe 49, the heat source side hot water becomes heat source side hot water flowing into the hot water storage tank 23 from the hot water inlet / outlet 23 d and heat source side hot water flowing into the use side heat exchanger 24 via the hot water inlet pipe 50. Divided. The heat source side hot water flowing into the hot water storage tank 23 is stored in the upper part of the hot water storage tank 23. Heat source side hot water flowing into the use side heat exchanger 24 is exchanged with hot water in the bathtub 60 and flows into the second inlet of the three-way valve 28 via the hot water outlet pipe 46. In this manner, hot water on the heat source side can be stored in the upper part of the hot water storage tank 23 and the hot water in the bathtub 60 can be replenished.

  In the simultaneous heating and reheating operation, the hot water on the heat source side after being heated by the boiling heat exchanger 12 passes through the hot water inlet and outlet pipes 50 and the hot water inlet pipe 50 and the hot water inlet pipe 50. The heat source side hot water flowing into the use side heat exchanger 24 is divided. Therefore, a part of the heating heat amount in the boiling heat exchanger 12 is used for the hot water on the heat source side flowing into the hot water storage tank 23, so that it is given to the hot water in the bathtub 60 by the use side heat exchanger 24 compared to the reheating independent operation. The amount of heat is reduced.

  The ratio of the heat source side hot water flowing from the heating unit 10 to the hot water storage tank 23 and the heat source side hot water flowing into the use side heat exchanger 24 during the simultaneous boiling and reheating operation is the first flow of the three-way valve 28. It depends on the ratio of the flow rate flowing from the inlet to the outlet and the flow rate flowing from the second inlet to the outlet. For example, when the flow rate flowing from the first inlet port to the outlet port is larger than the flow rate flowing from the second inlet port to the outlet port of the three-way valve 28, the hot water storage is higher than the flow rate of the heat source side hot water flowing into the use side heat exchanger 24. The flow rate of the heat source side hot water flowing into the tank 23 increases.

  FIG. 5 is a block diagram of a water heater according to the present invention. Next, the flow of signals in the water heater 1 will be described. The control device 22 is connected to the remote controller 21, a plurality of tank temperature sensors 23 e, a use side flow rate sensor 32, a use side forward temperature sensor 35, and a use side return temperature sensor 36. The control device 22 includes a signal including a set value such as a use side set temperature Tm which is a set temperature of hot water in the bathtub 60 from the remote controller 21 or information on an operation operation command such as on / off of the heating unit 10, and a plurality of signals. Of the tank temperature sensor 23e, the use side return temperature sensor 35 and the use side return temperature sensor 36, and the heat source side hot water passing through the third hot water supply pipe 53 measured by the use side flow rate sensor 32. Can be received.

  The control device 22 includes a compressor 11, a three-way valve 28, a hot water mixing valve 26, a use side mixing valve 27, a heat source pump 29, a four-way valve 30, a use side solenoid valve 33, and a use side. It is connected to the circulation pump 34 and can transmit a control signal to each device. For example, the control device 22 can control the rotation speed of the compressor 11, the opening degree of the first inlet of the three-way valve 28, and the opening degree of the second inlet.

  The control device 22 controls how to use the storage unit 22a that stores information necessary for controlling the water heater 1, the information that the signal received by the control device 22 and the information stored in the storage unit 22a. It has the judgment part 22b which judges whether to perform. The storage unit 22a stores a first threshold temperature T1 and a second threshold temperature T2. The first threshold temperature T1 and the second threshold temperature T2 are set in the control device 22 in association with the use side set temperature Tm that is the set temperature of the bathtub 60 set from the remote controller 21, and the first threshold temperature T1 is set to a temperature lower than the use side set temperature Tm, and the second threshold temperature T2 is set to a temperature higher than the use side set temperature Tm or the same temperature as the use side set temperature Tm. That is, the relational expression of T1 <Tm ≦ T2 is established.

  FIG. 6 is a flowchart of the automatic operation control of the water heater according to the present invention. Next, automatic operation control of the water heater 1 will be described. Note that at the stage of starting the automatic operation control, it is assumed that the bathtub 60 is already filled with water and the use-side circulation pump 34 is operating.

  In step S <b> 1, the control device 22 acquires a use side temperature T that is the temperature of hot water in the bathtub 60. In the first embodiment, when the usage-side circulation pump 34 is operating, the hot water in the bathtub 60 passes through the usage-side return temperature sensor 36 before flowing into the usage-side heat exchanger 24, so the control device 22 is The measured value of the use side return temperature sensor 36 is acquired as the use side temperature T. After obtaining the use side temperature T, the process proceeds to step S2.

  In step S2, the determination unit 22b compares the use side temperature T with the first threshold temperature T1 stored in the storage unit 22a, and determines whether the use side temperature T is equal to or lower than the first threshold temperature T1, that is, It is determined whether the condition of T ≦ T1 is satisfied. If the condition is satisfied, the process proceeds to step S4. If the condition is not satisfied, the process proceeds to step S3.

  In step S3, the determination unit 22b compares the use side temperature T with the second threshold temperature T2 stored in the storage unit 22a, and determines whether the second threshold temperature is higher, that is, T <T2. Judge whether to meet. If the condition is satisfied, the process proceeds to step S5. If the condition is not satisfied, the process proceeds to step S6.

  In step S4, the control device 22 changes the operation state of the water heater 1 to make it an independent operation. Specifically, the control device 22 controls the three-way valve 28 so that the second inlet and the outlet communicate with each other and closes the first inlet, and the four-way valve 30 further controls the first inlet and the second inlet. The flow path connecting the outlets is controlled to be selected. After the operating state of the water heater 1 is relegated to the single operation, the process returns to step S1. Since the use side temperature T when step S4 is executed is equal to or lower than the first threshold temperature T1, the use side temperature T is lower than the use side set temperature Tm. Therefore, by performing the reheating independent operation, the amount of heat can be given to the hot water in the bathtub 60, and the use side temperature T can be quickly raised to approach the use side set temperature Tm.

  In step S <b> 5, the control device 22 sets the operation state of the water heater 1 to boiling-up and reheating simultaneous operation. Specifically, the control device 22 controls the three-way valve 28 so that the first inlet and the outlet are in communication with each other and the second inlet and the outlet are in communication with each other. Control is performed so that the flow path connecting the inlet and the second outlet is selected. After the operation state of the water heater 1 is set to the boiling and chasing simultaneous operation, the process returns to step S1. The use side temperature T when step S5 is executed is a temperature that is higher than the first threshold temperature T1 and lower than the second threshold temperature T2, that is, a relationship of T1 <T <T2. In this case, since the use-side temperature T is close to the use-side set temperature Tm, the amount of heat given to the hot water in the bathtub 60 may be just the amount of heat radiated from the hot water in the bathtub 60, and it is necessary to give the amount of heat as much as the reheating independent operation. There is no. For this reason, by performing the simultaneous boiling and reheating operation, it is possible to give a lower amount of heat to the hot water in the bathtub 60 and maintain the use side set temperature Tm.

  In step S6, the control device 22 raises the operation state of the water heater 1 to the boiling-only operation. Specifically, the control device 22 controls the three-way valve 28 so that the first inlet and the outlet are in communication with each other and the second inlet is closed, and the four-way valve 30 is further closed with the first and second inlets. The flow path connecting the outlets is controlled to be selected. After making the operation state of the water heater 1 boil up and single operation, the process returns to step S1. Since the use side temperature T when step S6 is executed is equal to or higher than the second threshold temperature T2, the use side temperature T is higher than the use side set temperature Tm. Therefore, by performing the boiling-up single operation, the heated heat source side hot water is not allowed to flow into the use side heat exchanger 24, and the amount of heat is not given to the hot water in the bathtub 60.

  In addition, the heating unit 10 does not stop in the heating single operation, the reheating single operation, and the simultaneous heating and reheating simultaneous operation because the heating unit 10 continues to operate. Therefore, since the temperature of the hot water in the bathtub 60 is adjusted without starting and stopping the operation of the heating unit 10, it is possible to prevent the COP from being lowered due to the start and stop of the heating unit 10.

  Furthermore, when the temperature of the hot water in the bathtub 60 is adjusted, the hot water filling is already formed in the bathtub 60, and generally the hot water used for the hot water filling of the bathtub 60 is the hot water on the heat source side at the upper part of the hot water storage tank 23. Use. For this reason, when the temperature of the hot water in the bathtub 60 is adjusted, the amount of hot water remaining in the hot heat source side hot water in the hot water storage tank 23 is often reduced. In addition, the user may use the hot water on the heat source side of the hot water storage tank 23 from the shower and currant during bathing. Therefore, the hot heat source side hot water in the hot water storage tank 23 may be insufficient. However, the water heater 1 according to the first embodiment switches the three types of operation, that is, the boiling-only operation, the reheating independent operation, and the simultaneous heating and reheating operation when adjusting the temperature of the hot water in the bathtub 60. Simultaneously with the adjustment of the temperature of the 60 hot water, the hot heat source side hot water can be supplied to the hot water storage tank 23, and the situation where the user runs out of the high temperature heat source side hot water during bathing can be avoided.

  As described above, the water heater of the first embodiment compares the use side temperature T with the first threshold temperature T1 and the second threshold temperature T2, and according to the comparison result, the boiling-up single operation, the reheating single operation, Since switching between the three types of operation of boiling-up and chasing simultaneous operation is performed, the loss due to the start and stop of the heating means can be reduced, and the COP of the water heater can be improved. Moreover, since the high temperature heat source side hot water is supplied to the hot water storage tank when the use side temperature T is adjusted, it is possible to avoid a situation where the user is short of the high temperature heat source side hot water during bathing.

  In the first embodiment, the heating unit 10 heats the heat source side hot water by a heat pump cycle. However, the heating unit 10 is not limited to this, and the heat source side hot water is generated by heat generated when fuel such as oil or gas is burned. You may make it the structure which heats. However, since the heat pump has a corresponding time from the start to the amount of heat necessary for the reheating operation, the invention of the first embodiment exhibits a special effect particularly when the heating unit 10 is a heat pump.

  In the first embodiment, the heating unit return pipe 41 and the hot water supply pipe 49 are connected via the four-way valve 30. However, in the case of the single heating operation, the single heating operation, and the simultaneous boiling / refreshing operation, which is a feature of the present invention, the four-way valve 30 always has a flow path connecting the heating unit return pipe 41 and the hot water supply pipe 49. Is selected. Therefore, there may be a configuration in which the four-way valve 30 is not provided and the heating unit return pipe 41 and the hot water supply pipe 49 are directly connected.

  In the first embodiment, the use-side return pipe 42 and the use-side return pipe 43 are connected to the bathtub 60. However, the present invention is not limited to this. For example, the use-side return pipe 42 and the use-side return pipe 43 are used for hot water heating. It does not matter if they are connected. Furthermore, in the case of hot water heating, the usage-side hot water flowing through the usage-side forward piping 42 and the usage-side return piping 43 may not be general water such as antifreeze, so the usage-side mixing valve 27 and the usage-side flow sensor 32 are used. And the use side solenoid valve 33 and the 3rd hot water supply piping 53 may not be provided.

  FIG. 7 is a flowchart of automatic operation control of a water heater according to a first modification of the first embodiment. In the first embodiment, the use side temperature T is compared with the first threshold temperature T1 and the second threshold temperature T2, and according to the comparison result, the boiling single operation, the reheating single operation, and the simultaneous boiling and reheating operation are performed. Switching the type of operation. Not only this but the 1st modification of Embodiment 1 compares use side temperature T with the 3rd threshold temperature T3 preset beforehand more than use side preset temperature Tm like Step S20. When the use side temperature T is equal to or lower than the third threshold temperature T3, the operation is switched to the reheating isolated operation, and when the use side temperature T is higher than the third threshold temperature, the operation is switched to the simultaneous heating and reheating operation. This is fine. In the first modification of the first embodiment, the amount of heat given to the hot water in the bathtub 60 at the time of the simultaneous operation of boiling and reheating does not exceed the amount of heat radiated by the hot water in the bathtub 60. The controller 22 controls the water heater 1 so that the temperature of the hot water in the bathtub 60 does not continue to rise during operation.

  FIG. 8 is a flowchart of automatic operation control of the water heater according to the second modification of the first embodiment. In the second modification of the first embodiment, as shown in step S30, the use side temperature T is compared with the fourth threshold temperature T4 set in advance below the use side set temperature Tm. When the temperature is lower than the threshold temperature T4 of 4, the heating and reheating operation is simultaneously performed, and when the use side temperature T is higher than the third threshold temperature, the operation is switched to the heating only operation. However, in this case, the second threshold temperature T2 is set to the same temperature as the use side set temperature Tm or a temperature lower than the use side set temperature Tm. It should be noted that the temperature of the hot water in the bathtub 60 continues to decrease during the simultaneous heating and reheating operation, for example, the amount of heat given to the hot water in the bathtub 60 during the simultaneous operation of boiling and reheating does not fall below the amount of heat released by the hot water in the bathtub 60. The control device 22 controls the water heater 1 so as not to exist.

Embodiment 2
Next, a hot water heater according to Embodiment 2 will be described. In the water heater 1 according to the second embodiment, in addition to the control according to the first embodiment, the control device 22 is configured to control the flow rate flowing from the heating unit 10 to the user-side heat exchanger 24 during the simultaneous heating and reheating operation. The ratio of the flow rate flowing into the hot water storage tank 23 is controlled based on the use side temperature T.

  FIG. 9 is a graph showing the relationship between the ratio of the flow rate flowing from the heating unit 10 to the use side heat exchanger 24 and the use side temperature T in the second embodiment. X1 in the graph is a preset first ratio, and X2 is a preset second ratio. At least the first ratio X1 and the second ratio X2 are set so as to satisfy the condition of 100%> X1> X2> 0%. The ratio of the flow rate flowing from the heating unit 10 to the hot water storage tank 23 can be calculated by (100—the ratio of the flow rate flowing to the usage-side heat exchanger 24), for example, from the heating unit 10 to the usage-side heat exchanger 24. When the ratio of the flowing flow rate is 20%, the ratio of the flow rate flowing from the heating unit 10 to the hot water storage tank 23 is 80%.

  When the use side temperature T is equal to or lower than the first threshold temperature T1, that is, in the region of T ≦ T1, the control device 22 controls the hot water heater 1 to be driven in a single operation. The opening degree of the first inlet and the second inlet of the three-way valve 28 is controlled so that the ratio of the flow rate flowing into the utilization side heat exchanger 24 becomes 100%. Since all of the heating heat amount by the boiling heat exchanger 12 is supplied to the use side heat exchanger 24, the use side temperature T can be quickly raised.

  In the case where the use side temperature T is higher than the first threshold temperature T1 and lower than the use side set temperature Tm, that is, in the region of T1 <T <Tm, the controller 22 raises the hot water heater 1 at the same time. The first inlet port and the second inlet port of the three-way valve 28 are set so that the ratio of the flow rate that is operated by the operation and flows into the use-side heat exchanger 24 from the heating unit 10 becomes the first ratio X1% set in advance. To control the opening degree. Therefore, of the amount of heat heated by the boiling heat exchanger 12, the heat amount of the first ratio X1% is used in the use side heat exchanger 24. Since the use side temperature T is closer to the use side set temperature Tm than the first threshold temperature T1, by supplying a less amount of heat to the use side heat exchanger 24 than when the reheating individual operation is performed, a gradual temperature change is performed. The use side temperature T can be raised.

  When the use side temperature T is equal to or higher than the use side set temperature Tm and lower than the second threshold temperature T2, that is, in the region of Tm ≦ T <T2, the control device 22 raises the hot water heater 1 and simultaneously drives it. And the flow rate of the flow from the heating unit 10 to the use-side heat exchanger 24 is set to the second ratio X2% set in advance, so that the first inlet and the second inlet of the three-way valve 28 Control the opening. Therefore, of the amount of heat heated by the boiling heat exchanger 12, the heat amount of the second ratio X2% is used by the use-side heat exchanger 24. Since the use side temperature T is higher than the use side set temperature Tm, by supplying a smaller amount of heat than in the case of T1 <T <Tm, the amount of heat released from the hot water in the bathtub 60 is compensated, and the use side The temperature T can be maintained.

  In the case where the use side temperature T is equal to or higher than the second threshold temperature T2, that is, in the region of T2 ≦ T, the control device 22 controls the hot water heater 1 to operate in a boiling-up single operation. The opening degree of the first inlet and the second inlet is controlled so that the ratio of the flow rate flowing into the utilization-side heat exchanger 24 from 0% becomes 0%. Therefore, the amount of heat heated by the boiling heat exchanger 12 is not supplied to the use side heat exchanger 24.

  As described above, based on the use side temperature T, the flow rate flowing from the heating unit 10 to the use side heat exchanger 24 and the flow rate flowing from the heating unit 10 to the hot water storage tank 23 at the time of simultaneous heating and reheating By controlling this ratio, the use side temperature T can be made closer to the use side set temperature Tm.

  Further, Xm in the graph of FIG. 9 is a heating unit that supplies the usage-side heat exchanger 24 with the same amount of heat as the heat radiation from the hot water of the bathtub 60 when the usage-side temperature T is equal to the usage-side set temperature Tm. 10 is the ratio of the flow rate flowing from 10 to the use-side heat exchanger 24 and is named the equilibrium ratio Xm. The balance ratio Xm is determined by the heating capacity of the heating unit 10 and the amount of heat released at the use side set temperature Tm. For example, when the heating capacity of the heating unit 10 is 3 kW, the use side set temperature is 40 ° C., and the heat radiation amount at 40 ° C. is 0.6 kW, the heat radiation heat amount is 20% of the heating capacity of the heating unit 10. The equilibrium ratio Xm is 20%. In the second embodiment, the first ratio X1 and the second ratio X2 need only be set so as to satisfy the condition of at least 100%> X1> X2> 0%. Thus, if the first ratio X1 and the second ratio X2 are set so as to satisfy the condition of X2 <Xm <X1, the use side temperature T can be brought closer to the use side set temperature Tm with higher accuracy.

  Since the equilibrium ratio Xm varies depending on the use side set temperature Tm, when the use side temperature T is brought closer to the use side set temperature Tm, the balance ratio Xm corresponding to the use side set temperature Tm that can be set in the storage unit 22a. May be stored, and the equilibrium ratio Xm may be set according to the use side set temperature Tm set by the remote controller 21.

  FIG. 10 is a graph showing the relationship between the ratio of the flow rate flowing from the heating unit 10 to the usage-side heat exchanger 24 and the usage-side temperature T in the modification of the second embodiment. In the second embodiment, the ratio of the flow rate flowing from the heating unit 10 to the use side heat exchanger 24 is intermittently changed. This is the degree of opening of the first inlet and the second inlet of the three-way valve 28. This is to make it easier to control. Therefore, if the opening degree of the first inlet and the second inlet of the three-way valve 28 can be precisely controlled, the ratio of the flow rate flowing from the heating unit 10 to the use side heat exchanger 24 as shown in FIG. The temperature may be changed continuously according to the use side temperature T. Although FIG. 10 is linearly changed, the present invention is not limited to this, and the flow rate of the flow flowing from the heating unit 10 to the use side heat exchanger 24 as the use side temperature T rises in the region of T1 <T <T2. A curve may be used if the ratio is changed to be low. Further, by setting the ratio of the flow rate flowing from the heating unit 10 to the usage-side heat exchanger 24 when the usage-side temperature T is equal to the usage-side set temperature Tm to be equal to the equilibrium ratio Xm, T becomes substantially the same temperature as the use side set temperature Tm.

Embodiment 3
Next, a water heater according to Embodiment 3 will be described. In the water heater 1 according to the third embodiment, in addition to the control according to the first embodiment, a control device is provided according to each operation during the boiling single operation, the reheating single operation, and the simultaneous boiling and reheating operation. 22 changes the heating capacity of the heating unit 10. As a specific means for changing the heating capacity, there is a method of changing the rotational speed of the compressor 11. The heating capacity can be reduced by lowering the rotational speed, and heating can be performed by increasing the rotational speed. Capability can be increased.

  First, the rotation speed of the compressor 11 at the time of simultaneous boiling-up and reheating operation will be described in comparison with other operations. In the case of simultaneous boiling and reheating operation, it is only necessary to be given to the hot water in the bathtub 60 by the amount of heat dissipated from the hot water in the bathtub 60. The rotation speed of the compressor 11 may be low. Therefore, the power consumption of the compressor 11 is reduced when the number of rotations of the compressor 11 during the simultaneous heating and reheating operation is set lower than that during the single heating operation and the reheating independent operation. . Moreover, the minimum rotation speed which can be drive | operated is set to the general compressor from a viewpoint of reliability, and even if it is the minimum rotation speed which can be drive | operated, the heating capability of the heating unit 10 is the amount of heat radiation from the bathtub 60. It may be excessive compared with. Therefore, the rotation speed of the compressor 11 may be set near the lowest rotation speed that can be operated.

  Next, the number of rotations of the compressor 11 during the boiling-up single operation and the number of rotations of the compressor 11 during the reheating-only operation will be compared and described. In the case of the boiling-only operation, it is necessary to boil the low-temperature heat-source-side hot water below the hot-water storage tank 23 into the high-temperature heat-source-side hot water by the heating unit 10. Further, in the case of the reheating independent operation, it is necessary to boil the heat source side hot water that has been subjected to heat exchange by the use side heat exchanger 24 into hot water by the heating unit 10. Comparing the low temperature heat source side hot water at the lower part of the hot water storage tank 23 and the heat source side hot water subjected to heat exchange by the use side heat exchanger 24, the temperature of the low temperature heat source side hot water at the lower part of the hot water storage tank 23 is generally higher. Low. Therefore, the heat source side hot water at the lower part of the hot water storage tank 23 and the heat source side hot water subjected to heat exchange with the use side heat exchanger 24 differ in the amount of heat required to boil up to the same high temperature heat source side hot water. Lower temperature heat source side hot water requires more heat. Therefore, it is necessary to increase the heating capacity of the heating unit 10 during the boiling single operation and during the boiling single operation, and the rotation speed of the compressor 11 is higher than that during the boiling single operation. Must be high.

  In view of the above, the amount of heat required for each of the boiling single operation, the reheating single operation, and the simultaneous boiling and reheating operation is as follows: boiling single operation> reheating single operation> simultaneous boiling and reheating operation A relationship is established. Therefore, the water heater 1 according to the third embodiment is configured so that the rotation speed of the compressor 11 satisfies the following relationship: boiling-up single operation> reheating single operation> boiling / refreshing simultaneous operation. The rotational speed of the compressor 11 is set, and the control device 22 performs control so that the rotational speed of the compressor 11 is also switched simultaneously when the operation is switched. In particular, since the rotation speed of the compressor 11 is lowered when switching from a single boiling operation or a single boiling operation to a simultaneous boiling and additional operation, the power consumption of the compressor 11 during the simultaneous boiling and additional operation is also reduced. Go down.

  In general, the rotational speed of the compressor 11 is determined according to the outside air temperature or the incoming water temperature, and the rotational speed of the compressor 11 may be different even when the heating unit 10 generates the same amount of heat. For example, in the winter when the outdoor temperature is low and in the summer when the outdoor temperature is high, the rotational speed of the compressor 11 must be set higher in the winter in order to generate the same amount of heat. Therefore, the maximum number of rotations and the minimum number of rotations for ensuring the amount of heat necessary for each operation are obtained from the situation assumed in the place where the heating unit 11 is installed, and the minimum number of rotations from the maximum number of rotations during each operation. The rotational speed range up to is also determined. At this time, when comparing the maximum number of rotations and the minimum number of rotations during each operation, the relationship of boiling single operation> reheating single operation> boiling and recurrent simultaneous operation holds, but focusing on the rotation speed range, For example, the minimum number of revolutions for boiling-up single operation is higher than the maximum number of rotations for simultaneous boiling-up and reheating. Some of them may overlap. In this way, when switching from one operation to the other operation, if the rotation speed during one operation is within the rotation speed range of the other operation, the rotation speed need not be changed.

Embodiment 4
Next, a water heater according to Embodiment 4 will be described. In the water heater 1 according to the fourth embodiment, the controller 22 controls the boiling temperature of the hot heat source side hot water stored in the upper part of the hot water storage tank 23. It is assumed that the boiling temperature is already stored in the storage unit 22a by means such as being input from the remote controller 21.

  Further, the control device 22 has a timer, and when the control device 22 reaches the time stored in the storage unit 22a in advance based on the timer, the boiling single operation is performed at the boiling temperature stored in the storage unit 22a. The high temperature heat source side hot water in the upper part of the hot water storage tank 23 is periodically replenished. This regular boiling-up single operation is often set in a time zone where electricity costs are low, such as late at night. On the other hand, since the boiling and chasing simultaneous operation is performed when the user uses the bathtub 60, it is often used mainly in the time zone before midnight such as evening or night. For this reason, the temperature of the hot water on the heat source side that has been boiled periodically in a single boiling operation is often lowered during the time when the simultaneous boiling and reheating operation is used. In this case, even when the hot water source hot water is boiled at the boiling temperature stored in the storage unit 22a during the simultaneous boiling and reheating operation, the hot water source hot water is higher than the hot heat source side hot water when flowing into the hot water storage tank 23. It is difficult to form a high temperature heat source side hot water layer by mixing with the hot water source hot water on the hot water storage tank 23 at a low temperature. Therefore, the refrigerant discharge temperature can be lowered by controlling the control device 22 so that the boiling temperature at the time of simultaneous boiling and reheating operation is lower than the boiling temperature stored in the storage unit 22a. And COP can be increased.

  In this way, the boiling temperature of the simultaneous boiling and reheating operation can be reduced by lowering the boiling temperature at the time of the single heating operation performed periodically, thereby reducing the power consumption of the heating unit 10. This can contribute to an increase in COP.

  In addition, it is desirable that the boiling temperature in the case of simultaneous boiling and reheating operation is the temperature of the hot water on the heat source side above the hot water storage tank 23 at the time of operation switching. The temperature of the heat source side hot water at the upper part of the hot water storage tank 23 at the time of operation switching refers to, for example, the temperature of the tank temperature sensor 23e attached at the top of the plurality of tank temperature sensors 23e attached to the surface of the hot water storage tank 23. There is a way to do it. In addition, the relationship between the elapsed time from the boiling single operation and the decreased temperature and the end time of the last night boiling single operation are stored in the storage unit 22a, and the determination unit 22b is the current time when the operation is switched. And the end time stored in the storage unit 22a to obtain the elapsed time, and subtract the temperature lower than the boiling temperature from the elapsed time to subtract the temperature of the heat source side hot water on the hot water storage tank 23 at the time of operation switching There is also a method for calculating.

DESCRIPTION OF SYMBOLS 1 Water heater, 10 Heating unit, 11 Compressor, 12 Heat exchanger for boiling, 13 Expansion valve, 14 Air heat exchanger, 15 Refrigerant piping, 20 Tank unit, 21 Remote control, 22 Control apparatus, 22a Memory | storage part, 22b Judgment unit, 23 hot water storage tank, 23a water inlet, 23b water outlet, 23c medium temperature water inlet, 23d warm water inlet, 23e tank temperature sensor, 24 use side heat exchanger, 25 pressure reducing valve, 26 hot water mixing valve, 27 Use side mixing valve, 28 Three-way valve, 29 Heat source pump, 30 Four-way valve, 31 Water tap, 32 Use side flow sensor, 33 Use side solenoid valve, 34 Use side circulation pump, 35 Use side forward temperature sensor, 36 Use side return Temperature sensor, 40 Heating unit return piping, 41 Heating unit return piping, 42 User side return piping, 43 User side return piping 44 water supply pipe, 44a first water supply pipe, 44b second water supply pipe, 44c third water supply pipe, 45 water outlet pipe, 46 hot water outflow pipe, 47 first bypass pipe, 48 second bypass pipe, 49 hot water supply pipe 50 hot water inflow piping, 51 first hot water supply piping, 52 second hot water supply piping, 53 third hot water supply piping, 60 bathtub

Claims (8)

Heating means for heating and flowing out the flowing hot water on the heat source side,
A hot water storage tank into which the heat source side hot water heated by the heating means flows from the upper part, and water serving as the heat source side hot water from the lower part is supplied from the lower part;
The heat-source-side hot water heated by the heating means and the use-side hot water flow in, and the use-side heat exchanger that exchanges heat between the heat-source-side hot water and the use-side hot water,
A first inlet into which the heat source side hot water stored in the hot water storage tank flows, a second inlet into which the heat source side hot water flowing out from the use side heat exchanger flows, the first inlet, and the A flow rate adjusting means having an outlet through which the hot water on the heat source side flowing in from the second inlet flows out to the heating means;
A use side temperature sensor for measuring a temperature of the use side hot water before flowing into the use side heat exchanger;
By controlling the opening degree of the first inlet and the opening degree of the second inlet of the flow rate adjusting means, the flow rate of the heat source side hot water flowing out from the heating means and flowing into the use side heat exchanger And a control device capable of adjusting the flow rate flowing into the hot water storage tank,
The control device is set to the set temperature of the use-side hot water, the first threshold temperature set to a temperature lower than the set temperature, and the same temperature as the set temperature or higher than the set temperature. A second threshold temperature is preset,
When the measured temperature of the use side temperature sensor is equal to or lower than the first threshold temperature, the control device is configured so that the heat source side hot water heated by the heating unit flows into the use side heat exchanger. When the flow rate adjustment means is controlled and the measured temperature of the use side temperature sensor is higher than the first threshold temperature and lower than the second threshold temperature, the heat source side hot water heated by the heating means is The flow rate adjusting means is controlled to flow into both the use side heat exchanger and the hot water storage tank, and when the measured temperature of the use side temperature sensor is equal to or higher than the second threshold temperature, the heating means A hot water supply apparatus, wherein the flow rate adjusting means is controlled so that the heated hot water on the heat source side flows into the hot water storage tank. When the measured temperature of the usage-side temperature sensor is higher than the first threshold temperature and lower than the second threshold temperature, the control device, based on an increase in the measured temperature of the usage-side temperature sensor, The water heater according to claim 1, wherein the flow rate adjusting means is controlled so that a flow rate flowing out from the heating means to the use side heat exchanger is reduced. The heating capacity of the heating means is determined by the set temperature of the use side hot water, and the amount of heat given to the use side hot water by the use side heat exchanger is equal to the amount of heat radiated from the use side hot water. An equilibrium ratio that is a ratio between a flow rate flowing from the heating means into the use side heat exchanger and a flow rate flowing from the heating means into the hot water storage tank is determined,
When the measured temperature of the use side temperature sensor is lower than the set temperature of the use side hot water, the control device is configured such that the flow rate flowing from the heating means into the use side heat exchanger is the heating means at the equilibrium ratio. The flow rate adjusting means is controlled to be greater than the flow rate flowing into the usage side heat exchanger from the heating side, and when the measured temperature of the usage side temperature sensor is higher than the set temperature of the usage side hot water, the heating The flow rate adjusting means is controlled such that the flow rate flowing from the heating means into the usage side heat exchanger is less than the flow rate flowing from the heating means to the usage side heat exchanger at the equilibrium ratio. Item 3. A water heater according to item 2. The control device is capable of controlling the heating capacity of the heating means,
The heating capacity is higher when the heat source side hot water flowing out by the heating means flows into the use side heat exchanger than when flowing into both the use side heat exchanger and the hot water storage tank. It controls as follows, The hot water supply apparatus as described in any one of Claims 1-3 characterized by the above-mentioned. The controller is
The heat source side hot water flowing out by the heating means is controlled so that the heating capacity is higher when flowing into the hot water storage tank than when flowing into the use side heat exchanger. The water heater according to claim 4. The heating means heats the flowing hot water on the heat source side by a heat pump cycle constituted by a compressor, a heat exchanger for boiling, an expansion valve, and an air heat exchanger,
The hot water heater according to claim 4 or 5, wherein the control device controls a heating capacity of the heating means by controlling a rotation speed of the compressor. The control device has a timer and stores a predetermined time. When the timer reaches a predetermined time, the heating means heats the hot water on the heat source side and is heated by the heating means. And controlling the opening of the first inlet of the flow rate adjusting means and the opening of the second inlet so that the heat source side hot water flows into the upper part of the hot water storage tank,
The control device is configured such that the measured temperature of the use-side temperature sensor is higher than the first threshold temperature than the heating capability of the heating unit when the timer has reached a predetermined time, and the second threshold temperature. The hot water heater according to any one of claims 1 to 6, wherein the heating capacity of the heating means is controlled to be lower when the temperature is lower. Heating means for heating and discharging the hot water on the heat source side;
A hot water storage tank into which the heat source side hot water heated by the heating means flows from the upper part, and water serving as the heat source side hot water from the lower part is supplied from the lower part;
The heat source side hot water heated by the heating means and the use side hot water flow in, and the use side heat exchanger that performs heat exchange between the heat source side hot water and the inflow hot water with the use side hot water,
A first inlet into which the heat source side hot water stored in the hot water storage tank flows, a second inlet into which the heat source side hot water flowing out from the use side heat exchanger flows, the first inlet, and the A flow rate adjusting means having an outlet for allowing the heat source side hot water flowing in from the second inlet to flow out to the heating means;
A use side temperature sensor for measuring a temperature of the use side hot water before flowing into the use side heat exchanger;
By controlling the opening degree of the first inlet and the opening degree of the second inlet of the flow rate adjusting means, the flow rate of the heat source side hot water flowing out from the heating means and flowing into the use side heat exchanger And a control device capable of adjusting the flow rate flowing into the hot water storage tank,
The control device is preset with a set temperature of the user-side hot water and a threshold temperature set higher than the set temperature,
When the measured temperature of the use side temperature sensor is lower than the threshold temperature, the control device causes the heat source side hot water heated by the heating means to flow into both the use side heat exchanger and the hot water storage tank. The flow rate adjusting means is controlled so that the heat source side hot water heated by the heating means flows into the hot water storage tank when the measured temperature of the use side temperature sensor is equal to or higher than the threshold temperature. A water heater characterized by controlling the means.

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