JP2605545B2 - Hot water storage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type hot water supply apparatus in which an outdoor heat exchanger can be defrosted and a hot water storage tank is multiply connected.

[0002]

2. Description of the Related Art First, referring to FIGS. 8 and 9, when performing a defrost operation for removing frost from an outdoor heat exchanger, a conventional heat source utilizing a bathtub exhaust heat, a hot water storage tank hot water, and indoor heat is used as a heat source of the defrost operation. A heat pump system (for example, JP-A-62-252864) will be described.

FIG. 8 shows a refrigerant circuit diagram of a heat pump type heating / water heater. This air conditioner includes an outdoor unit 1, a plurality of indoor units 2, 3, 4, a bathtub unit Y, a hot water storage unit 8
And The outdoor unit 1 has a compressor 61, and a discharge pipe 62 and a suction pipe 63 of the compressor 61 are respectively connected to a four-way switching valve 64.

The compressor 61 has an inverter 65 for controlling the rotation speed, that is, the compression capacity. A solenoid valve 66 is provided in the discharge pipe 62, and an accumulator 67 is provided in the suction pipe 63. ing. Gas pipes 68 and 69 are connected to the four-way switching valve 64. The gas pipe 68 is connected to the outdoor heat exchanger 70 and the gas pipe 6
9 is connected to the header 71.

A liquid pipe 73 is connected to the outdoor heat exchanger 70.
The liquid tube 73 is connected to a liquid receiver 74, and an expansion valve 75 is provided in the middle of the liquid tube 73. One end of a liquid pipe 76 is connected to the liquid receiver 74.
A plurality of branch refrigerant pipes 7 are provided between the other end of the
8a to 78d are connected in parallel with each other.

The branch refrigerant pipe 78d has a bathtub heat exchanger 81 and an expansion valve 80d, and the remaining branch refrigerant pipes 78a, 78b, 78c have the indoor heat exchanger 7 respectively.
9 and expansion valves 80a, 80b, 80c. Each of the indoor units 2, 3, and 4 includes an indoor heat exchanger 79 and an indoor fan 90.

The bathtub unit Y includes a bathtub heat exchanger 8
1, a bath 5 and a circulation pump 88a.

On the other hand, a gas pipe 82 is further connected to the discharge pipe 62 of the compressor 61, and the gas pipe 82 is connected to a hot water tank (for hot water supply) heat exchanger 1 provided on the hot water storage tank 11 side.
4 are connected. The hot water supply heat exchanger 14 is further connected to a liquid receiver 74 by a liquid pipe 84. The gas pipe 82 is provided with an electromagnetic valve 85, and the liquid pipe 84 is provided with a capillary tube 86 and a check valve 87.

The liquid pipe 84 further includes the check valve 87.
Is connected to the bypass pipe 100, and a solenoid valve 101 and a capillary tube 102 are interposed in the bypass pipe 100. Further, an intermediate portion of the gas pipe 82 and an intermediate portion of the suction pipe 63 are connected to the connecting gas pipe 10.
The connecting gas pipe 103 is provided with an electromagnetic valve 104.

During the heating and bath tub heating operation of the heating water heater, the solenoid valve 66 is opened, the solenoid valve 85 is closed, and the compressor 6
Operation 1 is performed (the electromagnetic valves 101 and 104 are both closed). Then, the refrigerant is condensed in the indoor heat exchanger 79 and the bathtub heat exchanger 81 via the four-way switching valve 64 and the gas pipe 69, and then is passed through the liquid pipes 76 and 73 to the outdoor heat exchanger. 7
It evaporates at 0, and then flows back to the compressor 61 via the gas pipe 68 and the four-way switching valve 64.

In the hot water supply operation, the compressor 61 is operated by closing the solenoid valve 66 and opening the solenoid valve 85 (the solenoid valve 1).
01 and 104 are both closed). Then, the refrigerant flows into the gas pipe 8
2, condenses in the hot water supply heat exchanger 14, then evaporates in the outdoor heat exchanger 70 via the liquid pipe 84, the liquid receiver 74, and the liquid pipe 73, and then evaporates. Four-way switching valve 6
The flow is returned to the compressor 61 via 4.

The cooling / bath cooling operation in the above apparatus is performed by switching the four-way switching valve 64 and circulating the refrigerant from the outdoor heat exchanger 70 to the indoor heat exchanger 79 and the bathtub heat exchanger 81. . In the cooling / bath bath cooling / hot water supply operation, the refrigerant discharged from the compressor 61 is supplied to the gas pipe 82.
, And then condensed in the indoor heat exchanger 79 and the bathtub heat exchanger 81 via the liquid pipe 84, the liquid receiver 74, and the liquid pipe 76, afterwards,
This is performed by circulating in a circuit returning to the compressor 61 via the gas pipe 69 and the four-way switching valve 64.

Next, control of the defrosting operation of the heating / water heater will be described. As shown in FIG. 9, the outdoor unit 1 includes:
An outdoor control device 91, an inverter control device 92, and a valve switching means 93 are configured. Inverter control device 92
Is the frequency at the inverter 65, that is, the compressor 61
This is for controlling the number of rotations.

The valve switching means 93 is provided with an outdoor control device 91.
The electromagnetic valves 66 and 8 are controlled by a command from the operation control means.
5, 101, 104 and the four-way switching valve 64 are controlled to control the flow of the refrigerant in the heating operation, the bathtub heating operation, the defrost operation, and the like.

A signal is input to the outdoor control unit 91 from the bathtub unit Y. This signal is a bathtub exhaust heat available signal indicating that the bathtub 5 is not in the heating or heat keeping operation. That is, in a room such as a kitchen, a remote control box 94 connected to the bathtub unit Y is arranged. The remote control box 94 is provided with a bathtub exhaust heat utilization switch 95, and the bathtub exhaust heat utilization switch 95 is turned on. It is assumed that the above signal is transmitted to the bath controller 8
The signal is output to the outdoor control device 91 via 8b.

On the other hand, in the hot water storage tank 11, a hot water temperature thermometer 96 for detecting the hot water temperature is arranged.
6 is connected to the comparator 97 of the outdoor control device 91.
That is, the temperature of the hot water in the hot water storage tank 11 detected by the hot water thermostat 96 is compared with a reference value (for example, 1
(2 ° C.). If the hot water temperature is equal to or higher than the reference value, a hot water storage available signal is input from the comparator 97 to the operation control means.

Next, the control of the defrosting operation of the heat pump type heating / water heater will be described. When a bathtub exhaust heat available signal is input from the switch 95 of the remote control box 94 to the outdoor control device 91, the outdoor control device 91 controls the valve switching means 93 to perform a defrost operation using the bathtub exhaust heat.

That is, the solenoid valve 66 is opened, the solenoid valve 85 is closed (both the solenoid valves 101 and 104 are closed), and the expansion valve 80d corresponding to the bath heat exchanger 81 is controlled to be open to control the compressor 6
1 (the other expansion valves 80a, 80b, 80c are closed). Then, the refrigerant (hot gas) from the compressor 61
As a result, the outdoor heat exchanger 70 is defrosted, and the condensed refrigerant evaporates (absorbs heat) in the bathtub heat exchanger 81 via the liquid pipe 73, the liquid receiver 74, and the liquid pipe 76. . The evaporated refrigerant is supplied to the gas pipe 69 and the four-way switching valve 6.
4 and is returned to the compressor 61.

No signal is input from the switch 95,
When the hot water storage tank hot water use enable signal is input from the comparator 97 to the outdoor control unit 91, the outdoor control unit 91 switches the valve switching means 93 to perform the defrost operation using the hot water storage tank hot water.
Control.

That is, the solenoid valve 66 is opened, the solenoid valve 85 is closed, the solenoid valves 101 and 104 are opened, and the expansion valves 80a to 80d are opened.
Are closed, and the compressor 61 is operated. Then, the refrigerant from the compressor 61 is condensed in the outdoor heat exchanger 70, and the condensed refrigerant is transferred again from the liquid pipe 73, the liquid receiver 74, the liquid pipe 84, and the bypass pipe 100 via the liquid pipe 84. Exchanger 1
At 4, evaporation (endotherm) occurs. The evaporated refrigerant is returned to the compressor 61 via the gas pipe 82, the connecting gas pipe 103, and the suction pipe 63.

The outdoor control device 91 has a switch 9
5. When no signal is input from the comparator 97, the outdoor controller 91 controls the valve switching means 93 to perform a defrost operation using indoor heat.

That is, the solenoid valve 66 is opened, the solenoid valve 85 is closed (both the solenoid valves 101 and 104 are closed), and the expansion valves 80a to 80c corresponding to the indoor heat exchanger 79 to be used are controlled to be open, so that the compressor is controlled. 61 is operated (the bathtub expansion valve 80d is closed). Then, the refrigerant from the compressor 61 is condensed in the outdoor heat exchanger 70, and the condensed refrigerant is supplied to the liquid pipe 73 and the receiver 7.
4. Evaporation (heat absorption) in the indoor heat exchanger 79 via the liquid pipe 76.

The evaporated refrigerant is returned to the compressor 61 via the gas pipe 69 and the four-way switching valve 64.
In other words, the above-described control method preferentially uses the bathtub exhaust heat when the bathtub exhaust heat is available, and then uses the hot water of the hot water storage tank when it is not available. If neither of them can be used, the defrost operation is performed in accordance with a certain priority of finally using the indoor heat.

[0024]

When the hot water storage unit 8 has one hot water storage tank, a large amount of hot water is used when supplying hot water to the bath tub. However, when such a large container is installed close to the veranda of an apartment or an outdoor wall such as under an eaves in an alley, multiple small-diameter hot water storage tanks are arranged in a row to impair the livability in terms of installation space. Are provided.

However, such a conventional example (JP-A-62-252)
864), the defrost operation at the time of reheating of the bathtub is a defrost operation using the exhaust heat of the hot water storage tank.

Therefore, in the worst case, the reheating operation is continuously performed, and when the defrost operation is performed by the hot water storage tank, the temperature of the lower portion of the hot water storage tank is extremely lowered, and there is a possibility that freezing occurs in the pump circulation circuit. In particular, in the case of a multiple tank composed of a plurality of hot water storage tanks, there is a problem that the possibility of freezing is particularly high because the heating hot water storage tank has a small capacity.

The present invention has been made to solve the above-mentioned conventional disadvantages, and an object of the present invention is to provide a hot water supply type hot water supply apparatus capable of preventing freezing of a pump circulation circuit during a defrost operation. It is in.

[0028]

Accordingly, a hot water supply type hot water supply apparatus according to the present invention is provided with a hot water storage tank 11 having a heating means 14 for heating internal hot water and a hot water storage tank 11 having no heating means 14. If the hot water in the hot water storage tanks 12 and 13 and the hot water in the hot water storage tanks 12 and 13 are both at a predetermined high temperature and the temperature of the hot water in the hot water storage tanks 12 and 13 dedicated to the hot water storage tanks is low, the two hot water storage tanks 11 are used. , 12, 1
A hot water storage unit 8 provided with replacement means 55 for replacing the hot and cold water of the third hot water with each other, and using the hot water in the hot water storage tank 11 of the hot water storage unit 8 which also serves as an outdoor heat exchanger 70
In the hot water supply type hot water supply device which performs the defrost operation, the temperature detecting means 31 for detecting the temperature of the hot water in the hot water storage tank 11 also serving as the water heater during the defrost operation, and the temperature detected by the temperature detecting means 31 is preset. When the temperature is lower than the set temperature, a control means 51 for controlling the replacement means 55 to set a mode for replacing the hot and cold water in both the hot water storage tanks 11, 12, and 13 is provided.

[0029]

As shown in FIG. 1, when the temperature of the hot water storage tank 11 is low, the replacement means 55 is driven and controlled by the control means 51 so that the hot water storage tank 11 also serves as the hot water storage tank.
By replacing the hot water in the hot water storage tanks 12 and 13 dedicated to the hot water reservoir and using the entire hot water storage tanks 11, 12 and 13 as heat sources for the defrost operation, it is possible to prevent the pump circulation circuit from freezing.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of the hot water supply type hot water supply apparatus of the present invention will be described in detail with reference to the drawings. The overall configuration for performing the defrost operation is the same as that in FIG.
Therefore, the configuration of the hot water storage unit 8 of the multiple tank type will be described first.

FIG. 3 is a schematic diagram showing the overall configuration of a multifunctional heat pump system having an air conditioning function, a bathtub hot water reheating function, and a drying function as well as a hot water storage type hot water supply apparatus according to one embodiment of the present invention. I have. In the outdoor unit 1,
The compressor, the outdoor heat exchanger, and the like described above are housed.

The outdoor unit 1 includes indoor units 2, 3, and 4 each having an indoor heat exchanger and a reheating unit 6 having a bath heating heat exchanger for heating hot and cold water in a bathtub 5. And a drying unit 7 and a hot water storage unit 8 installed on the ceiling of a bathroom or a dressing room adjacent to the bathroom.

By the drying unit 7 having the drying heat exchanger, the bathroom or the undressing room, which is normally unused except during bathing, can be used as a drying room for drying wet clothes after washing. Has been made.

The configuration of the hot water storage unit 8 will be described later. The operation of the reheating unit 6 and the hot water storage unit 8 is performed by a centralized remote controller 9 installed in a kitchen or the like. The operation of the reheating unit 6 and the drying unit 7 is controlled by a dedicated remote controller 10.
But it is made possible.

The operation of circulating the refrigerant to each of the utilization-side devices requiring an operation while monitoring the entire multifunctional heat pump system is controlled by an outdoor control device provided in the outdoor unit 1. Hereinafter, only the hot water supply heating operation for circulating the refrigerant in the hot water storage unit 8 will be described. In this case, a hot water supply heating operation request signal is transmitted from the hot water supply control device provided in the hot water storage unit 8 to the outdoor control device. This will be described in detail later.

Next, the configuration of the hot water storage unit 8 will be described with reference to FIG. In the hot water storage unit 8, as shown in FIG.
2, 13 are juxtaposed. Further, in the hot water storage unit 8, the hot water supply heat exchanger 1 constituted by a double pipe with leak detection is provided.
4 is disposed, and a flow path outside the hot water supply heat exchanger 14 serves as a refrigerant flow path, and gas-side and liquid-side refrigerant pipes 15 and 16 are connected to both ends thereof, respectively.
The hot water supply heat exchanger 14 is connected to the outdoor unit 1 by means of 5 and 16 so that the refrigerant can circulate.

At both ends of the inner flow path, a water forward pipe 17 and a water return pipe 1 connected to the bottom of the hot water storage tank 11, respectively.
8, and a circulation pump 19 is interposed in the outgoing pipe 17 for water. By operating the circulation pump 19, the hot or cold water on the bottom side of the hot water storage tank 11 is supplied to the hot water supply heat exchanger 1.
4 to circulate.

As described above, the hot water storage tank 11 is configured as a water heater / hot water storage tank provided with the heating means including the hot water supply heat exchanger 14, while the other two hot water storage tanks 1 are provided.
Numerals 2 and 3 are configured as hot water storage tanks dedicated to a hot water reservoir having no heating means.

On the other hand, in FIG. 4, a water supply pipe 21 is connected to an electromagnetic first three-way valve 22. Each switching port of the first three-way valve 22 is connected to a circulation pump 19 and a hot water storage by water supply branch pipes 23 and 24. The outgoing water pipe 17 between the tanks 11 and the bottom of the hot water storage tank 13 are connected to each other. The first three-way valve 22 has a function as a hot-water tank switching means as described later.

The upper portions of the hot water storage tank 11 and the hot water storage tank 12 are connected to a hot water supply pipe 25, respectively, while the upper part of the hot water storage tank 13 and the bottom of the hot water storage tank 12 are connected to each other by a communication pipe 26. Further, a replacement pipe 27 is connected to the bottom of the hot water storage tank 13, and the replacement pipe 27 is connected to the circulation pump 19 in the water forward pipe 17.
It is connected to a second electromagnetic three-way valve 28 interposed between the water supply branch pipe 23 and the connection point of the water supply branch pipe 23.

Further, on the outer wall surface of the hot water storage tank 11, there are provided a temperature sensor 31 comprising a thermistor for detecting the temperature of hot water on the bottom side and a temperature sensor 32 for detecting the temperature of hot water on the upper side. Are attached to the bottom side and the top side, respectively.

Similarly, on the outer wall surface of the hot water storage tank 12,
Temperature sensors 33, 34, etc. are attached to the bottom side and the upper side, while a temperature sensor 35 is attached to the bottom side of the outer wall surface of the hot water storage tank 13, and a temperature sensor 36 is attached to the heat exchanger 14 for hot water supply. Is being worn.

A drainage pipe 41 is connected to the bottom of each of the hot water storage tanks 11, 12, and 13. The drainage pipe 41 has a manual type that shuts off the movement and discharge of hot water between the hot water storage tanks during a steady operation. An on-off valve 42 is provided. Further, a flow switch 43 and a pressure switch 44 are provided in the water outward pipe 17, and a pressure reducing valve 45 is provided in the water supply pipe 21.
And a mixing tap 46 at a place where the hot water is used.

In the hot water storage tank 11, a late-night heater 47 is provided.
The hot water in the hot water storage tank 11 is heated at night by using late-night electric power, which has a low electric power cost.

Next, an operation state of the hot water storage unit 8 having the above configuration will be described. First, FIG. 5 shows an operation control system diagram, in which hot water supply control device 51 is provided in hot water storage unit 8.
Is provided, the set temperature Ds of the centralized remote controller 9 is input, and the temperature sensors 31 to 3 are set.
The detected temperature at 6 is input. First based on these,
The hot water supply control device 51 performs switching of the second three-way valves 22 and 28, operation of the circulation pump 19, and transmission of a hot water supply heating operation request signal to the outdoor control device 52 provided in the outdoor unit 1.

FIG. 6 shows a control flow chart during the water heating operation and the transfer operation. Step S1 is the second three-way valve 28.
This is an initial setting step in which the suction pump is kept off, whereby the suction side of the circulation pump 19 is maintained in a state of communicating with the bottom of the hot water storage tank 11.

The next step S2 is a step of comparing the temperature T1 detected by the temperature sensor 31 with the set temperature Ds. If it is determined that the detected temperature T1 is lower than the set temperature Ds, then in step S3, The output of the hot water supply heating operation request signal to the outdoor control device 52 is started. As a result, the refrigerant discharged from the compressor is supplied to the hot water supply heat exchanger 14 by the outdoor control device 52, and thereafter, the hot water supply heating operation returned to the compressor via the outdoor heat exchanger is started.

By the circulation of the refrigerant, the hot water supply heat exchanger 14
When the temperature T6 detected by the temperature sensor 36 exceeds the reference temperature Dcg in step S4, the operation of the circulation pump 19 is started in step S5.

As a result, the hot water in the hot water storage tank 11 circulates through the water outgoing pipe 17 and the water return pipe 18. At this time, the heat of condensation of the refrigerant is given by the hot water supply heat exchanger 14 and the hot water storage tank 11 is heated. Is returned to the bottom of In the hot water storage tank 11, the hot water is replaced by a convection with the low-temperature hot water on the upper side. Therefore, by continuing the hot water supply heating operation, the hot water is gradually replaced in the hot water storage tank 11 from the upper side with the high-temperature hot water. To go.

The above hot water supply heating operation is continued, and the hot water reaches the bottom side in the hot water storage tank 11, and the flow proceeds to step S
In step 6, when it is determined that the temperature T1 detected by the temperature sensor 31 has reached the thermo-OFF set temperature Doff set as a temperature higher by about 3 ° C. than the set temperature Ds, the water heater operation is ended.

Next, in step S7, the temperature T5 detected by the temperature sensor 35 attached to the bottom of the hot water storage tank 13 is set to a transfer start set temperature (D
s-α). When the detected temperature T5 is lower than the transfer start set temperature (Ds-α), the transfer operation is subsequently performed. That is, in step S8, the second three-way valve 28 is turned on.

As a result, the suction port of the circulation pump 19 communicates with the bottom of the hot water storage tank 13 through the replacement pipe 27, and as a result, as shown by the solid line arrow in FIG. It is sucked by the pump 19 and injected into the bottom of the hot water storage tank 11 through the hot water supply heat exchanger 14.

At the same time, the same amount of hot water as the amount injected from the hot water storage tank 11 to the bottom thereof is pushed out from the upper part, and the hot water is supplied to the upper part of the hot water storage tank 12, and further, the hot water at the bottom of the hot water storage tank 12 is passed through the communication pipe 26. 13, the extruding movement is sequentially performed to transfer the hot water, and the replacement is performed as a whole.

In this transfer operation, in step S9 in FIG. 6, the detected temperature T5 is changed to the transfer end first set temperature (Ds-
When it is determined that the high temperature state has been reached in step β), or when the temperature T2 detected by the temperature sensor 32 attached to the upper part of the hot water storage tank 11 in step S10,
When the temperature is lower than the transfer end second set temperature (Ds-γ), that is, in the hot water storage tank 11, the thermostat is turned off first.
All the water heated to the set temperature Doff is stored in the hot water storage tank 1
When it is determined that the transfer has been made to the sides 2 and 13, the operation is stopped. At this time, the process of turning off the second three-way valve in step S11 and returning to step S6 is performed. From the hot water storage tank 11, and the boiling operation for the low-temperature hot water is continuously performed.

Thereafter, at the stage when the boiling operation of the hot water in the hot water storage tank 11 is completed, until the hot water is already stored in the entire hot water storage tanks 12 and 13, the boiling operation is terminated. Then, the transfer operation of the boiling water to the hot water storage tanks 12 and 13 is performed.

When the entire hot water storage state has been reached, the process proceeds from step S7 to step S12 to stop the generation of the hot water supply heating operation request signal and to execute step S7.
After stopping the operation of the circulation pump 19 in step 13, the process returns to step S2, and thereafter, when it is determined that the temperature T1 detected by the temperature sensor 31 has become lower than the set temperature Ds, the above processing is repeated. Become.

As described above, the hot water storage tanks 12 and 13 are kept in the storage state for a long time, for example, and the temperature is lowered by natural heat radiation, or the amount of hot water used is placed on the bottom side of the hot water storage tank 13 by using hot water described later. When the same amount of water has flowed in, replacement with boiling water in the hot water storage tank 11 is appropriately performed.

As a result, the amount of hot water stored in the hot water storage tanks 12 and 13 having no heating means is maintained, so that the occurrence of running out of hot water when, for example, hot water is supplied to the bathtub is reduced.
Use comfort is maintained.

As described above, the hot water supply control device 51 controls the water heating operation and the transfer operation. At the same time, the hot water supply control device 51 controls the hot water storage tank 11 and the hot water storage tank 1.
Switching control of the tapping tank for determining from which of taps 2 and 13 tapping is performed.

This control will be described with reference to the flowchart of FIG. First, in step S21, the first three-way valve 22 is initially set to off, and then in step S22, the detected temperature T4 of the temperature sensor 34 attached to the upper side of the hot water storage tank 12 is set to the first reference tap water temperature. When the detected temperature T4 is lower than the reference temperature Dts3 (for example, 35 ° C.) of the storage tank side, the hot water exceeding the reference temperature Dts3 is stored in the hot water storage tanks 12, 13. If not, until the detected temperature T4 exceeds the high-temperature return set temperature Dts1 (for example, 45 ° C.) in step S23, and then, in step S24, the temperature sensor 32 attached to the upper side of the hot water storage tank 11 Detection temperature T
Until the temperature of the second hot water becomes lower than the reference temperature Dts2 (for example, 40 ° C.) of the water heater, which is the second reference temperature.
The off state of the three-way valve 22 is maintained.

At this time, as shown by the dashed arrow in FIG. 4, the water supply pipe 21 is maintained in a state of communicating with the bottom of the hot water storage tank 11. In this state, when the mixing tap 46 is opened, the water supply pipe 21 is opened. The hot water on the upper side in the hot water storage tank 11 is pushed up through the hot water supply pipe 25 by the pressure of the tap water acting through the hot water supply pipe, and the same amount of water is supplied from the water supply pipe 21 to the bottom of the hot water storage tank 11. Is done. That is, hot water storage tank 11 is maintained in a state selected as a hot water supply tank.

During the selection state, the above-described operation of heating the hot water in the hot water storage tank 11 is completed, and the operation of transferring the hot water to the hot water storage tanks 12 and 13 is performed.
In step S23, the detected temperature T4 exceeds the high temperature return set temperature Dts1, or in step S22, the detected temperature T4 of the temperature sensor 34 from the beginning is Dts3.
In the case described above, the first three-way valve 22 is turned on in the next step S25 only when the temperature T2 detected by the temperature sensor 32 is lower than the tank hot water reference temperature Dts2 in step S24, so that the hot water tank To the hot water storage tanks 12 and 13.

At this time, in FIG. 4, the water supply pipe 21 communicates with the bottom of the hot water storage tank 13 as indicated by a one-point arrow,
When the mixing tap 46 is opened, the pressure of the tap water acts on the hot water storage tank 12 from the water supply pipe 21 through the hot water storage tank 13 and the connection pipe 26, and the hot water is discharged from the upper side of the hot water storage tank 12, and the hot water is stored. The same amount of water as the amount of hot water is supplied to the bottom of the tank 13 through the water supply pipe 21.

In this switching state, the hot water storage tank 11
As a result of the water heating operation being performed on the side, until the temperature T2 detected by the temperature sensor 32 exceeds the hot water supply reference temperature Dts1 in step S26, or the hot water storage tanks 12,
The hot water in the inside runs out, and the process is continued until it is determined in step S27 that the temperature T3 detected by the temperature sensor 34 has become lower than the hot water supply reference temperature Dts3.

The detected temperature T2 is equal to the set high temperature return temperature D.
If it is equal to or longer than ts1, the process returns from step S26 to step S21. If it is determined that the detected temperature T3 has become lower than the tapping reference temperature Dts3, then step S28 is performed after step S27. In step, the first three-way valve 22 is turned off, and then the process returns to step S23.

As described above, when there is no hot water in the hot water storage tanks 12 and 13 above the hot water supply reference temperature Dts3, the hot water storage tank 1
1 is selected as a hot water tank. As a result, the temperature of the hot water is ensured, or even when there is no hot water in the hot water storage tank 11, the hot water can be discharged from the hot water storage tank 11 while performing the above-described water heating operation, so that hot water can be discharged. Operation is carried out with a minimum reduction in comfort.

Next, the gist of the present invention will be described in detail. That is, in the present invention, when the bath tub is operated for reheating, and the defrost operation is performed to perform defrosting of the outdoor heat exchanger by using the exhaust heat of the hot water storage unit 8, the above-described hot water storage tank 11 and the hot water storage tank 12, In this embodiment, the above-described transfer operation for replacing the hot and cold water is performed.

That is, when the hot water storage tank 11 also serves as a water heater, the second three-way valve 28 is turned on, and the heat source for the defrost operation is the entire three hot water storage tanks 11 to 13. The temperature of the hot water in the hot water storage tank 11 is detected by a temperature sensor (temperature detecting means) 31 and the output of the temperature sensor 31 is sent to a control means 51 shown in FIG. The transfer (replacement) mode is set and the defrost operation is performed in this transfer mode.

FIG. 2 shows a flowchart in such a case. As shown in FIG. 2, when performing the defrost operation using the exhaust heat of the hot water storage unit 8, step S31 is performed.
Judge whether the flag is 1 or 0. When the flag is 0 (F
_{In D} = 0), in step S32, the detected temperature T1 of the temperature sensor 31 of the hot water storage tank 11 and the transfer start temperature (Ds-
α).

When the detected temperature T1 is high, that is, when the temperature of the hot water in the hot water storage tank 11 is high, the defrost operation is performed without turning on the second three-way valve 28. If the detected temperature T1 is lower than the transfer start temperature (Ds-α), the second three-way valve 28 is turned on in step S33,
In the same manner as described above, the hot water storage tanks 11 to 13 are transferred, and a defrost operation is performed using the entire hot water storage tanks 11 to 13 as a heat source. At this time, the flag is set to 1.

Then, the process returns to step S31, and the flag is set to 1
Therefore, the process proceeds to step S34, and the detected temperature T1 of the hot water storage tank 11 is compared with the transfer end temperature (Ds-β).
If the detected temperature T1 of the hot water storage tank 11 is lower, the process proceeds to step S33, the second three-way valve 28 is turned on, and the defrost operation is continuously performed while continuing the transfer.

When the detected temperature T1 becomes higher in step S4, the second three-way valve 28 is turned off to stop the transfer, and the defrost operation is performed only in the hot water storage tank 11, as shown in step S35. At this time, the flag is set to 0, and the process returns to step S31. Hereinafter, this is repeated when performing the defrost operation.

[0073]

According to the present invention, the hot water supply type hot water supply apparatus includes a hot water storage tank provided with a heating means for heating the internal hot water, a hot water storage tank exclusive of the hot water storage tank having no heating means, and the hot water storage tank. When the hot water in the hot water storage tank is in a predetermined high temperature state and the temperature of the hot water in the hot water storage tank dedicated to the hot water storage is lower, a hot water storage unit having replacement means for replacing the hot water in both hot water storage tanks with each other is provided. In the hot water storage type hot water supply device provided so as to perform the defrost operation of the outdoor heat exchanger using hot water in the hot water storage tank also serving as the hot water storage unit of the hot water storage unit, the hot water in the hot water storage tank also serves as the defrost operation. Temperature detection means for detecting temperature;
If the temperature detected by the temperature detecting means is lower than a preset temperature, a control means for controlling the replacing means to set the mode for replacing the hot and cold water in both hot water storage tanks is provided. When the hot water temperature of the dual-purpose hot water storage tank is low, the replacement means is driven and controlled by the control means to replace the hot and cold water in the hot-water storage tank and the hot-water storage tank exclusively for the hot-water pool, and the entire hot-water storage tank is defrosted. By using this heat source, freezing of the pump circulation circuit can be prevented.

[Brief description of the drawings]

FIG. 1 is a functional diagram of an embodiment of the present invention.

FIG. 2 is a flowchart in a case where a defrost operation is performed.

FIG. 3 is a schematic diagram of the entire heat pump system according to the first embodiment;

FIG. 4 is a configuration diagram of the same hot water storage unit.

FIG. 5 is a control block diagram of the above.

FIG. 6 is a flowchart of control of a boiling operation and a transfer operation according to the first embodiment.

FIG. 7 is a flowchart of hot water tank switching control according to the first embodiment;

FIG. 8 is a functional system diagram of a heat pump heating water heater.

FIG. 9 is a block diagram of an operation control system according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Hot-water storage tank also used for water heater 12 Hot-water storage tank exclusively for hot-water pool 13 Hot-water storage tank exclusively for hot-water pool 14 Heating means 31 Temperature detecting means 51 Control means 55 Replacement means 70 Outdoor heat exchanger

Claims (1)

(57) [Claims] 1. A heating means (14) for heating hot water and water inside.
A hot water storage tank (11) provided with a water heater and a hot water storage tank (1) dedicated to a hot water tank not provided with a heating means (14)
2) (13) and the hot water storage tank (1)
1) When the hot and cold water in the hot water storage tanks (12) and (13) is lower than the predetermined high temperature and the hot and cold water in the hot water storage tanks (12) and (13) is low, the two hot water storage tanks (11), (12) and (13) A hot water storage unit (8) provided with replacement means (55) for replacing hot and cold water with each other is provided, and the outdoor heat exchanger utilizes hot water in a hot water storage tank (11) of the hot water storage unit (8) which also serves as a hot water tank. In the hot water type hot water supply apparatus configured to perform the defrosting operation of (70), a temperature detecting means (31) for detecting the temperature of the hot water in the hot water storage tank (11) also serving as the water heater during the defrosting operation; If the detected temperature in 31) is lower than the preset temperature, the replacement means (55) is controlled to control both hot water storage tanks (11), (12), (1).
3) The control means (5) for setting the mode for replacing the hot and cold water in
A hot-water storage type hot-water supply device characterized in that 1) is provided.