JPH0432655A - Hot water supply system and heat pump system with hot water supply function - Google Patents

Abstract

PURPOSE:To prevent shortage of hot water by outputting a hot water replacement command when the temperature of hot water in a hot water storage tank used only for storing the hot water is lower than that of replacement reference hot water. CONSTITUTION:A first hot water storage tank is formed as a hot water heating and storing tank provided with a heating means comprising a hot water supplying heat exchanger 14. Second and third hot water storage tanks 12, 13 are formed as exclusive hot water storage tanks having no heating means. The detecting temperature T5 of a fifth temperature sensor 35 attached to the bottom part of the third hot water storage tank 13 is compared with a transfer start setting temperature (replacement reference hot water storage temperature) (Ds-alpha). When T5 is lower than (Ds-alpha), a transfer operation is carried out. Hot water is transferred from the first hot water storage tank 11 whose temperature is higher than thermostatic control setting temperature Doff to the second and third hot water storage tanks 12, 13. A heating operation and a transfer operation are repeated and high temperature hot water substantially higher than the thermostatic setting temperature Doff is stored in all the hot water storage tanks 11 to 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot water supply system having a plurality of hot water storage tanks and a heat pump system having a hot water supply function.

(Conventional technology) As a conventional example of a heat pump type heating and water heater,
No. 3-164945 can be mentioned. This device has a hot water storage tank that also serves as a hot water heater and a hot water storage tank that is exclusively used for hot water storage.First, the hot water in the hot water storage tank that also serves as a hot water heater is boiled to a standard boiling temperature, and then this water is transferred to the cold water in the hot water storage tank that is used exclusively for hot water storage. After that, the operation control is performed to boil the cold water in the hot water storage tank that also serves as a water heater to the above-mentioned standard boiling temperature.

(Problem to be Solved by the Invention) By the way, when performing the above-mentioned operation control, in the stage before the above-mentioned replacement is performed, until the hot water in the water heater/storage tank is boiled to the standard boiling temperature, Although relatively high-temperature hot water is stored in the hot water storage tank that also serves as a hot water heater, an unbalanced state continues in which cold water is stored in the hot water storage tank that is only used for hot water storage. Moreover, such an unbalanced state exists even immediately after the above replacement operation is performed.

If hot water is used in such a state, hot water will be supplied at the beginning of use, but the hot water will run out within a short time after use. Although such occurrence of running out of hot water is not a major problem in the summer when the amount of hot water used and the amount of hot water required is relatively small, it greatly impairs the comfort of use in the winter when this is not the case. Particularly in winter, if hot water runs out in cold conditions, cold water must be used thereafter, and the discomfort caused by this is the main cause of impairing the comfort of use.

By the way, in recent years, heat pump systems equipped with both an air conditioning system and a hot water supply system as described above have come into practical use. As shown in Figure 2, during the winter, operation control is performed that prioritizes the heating side over the hot water supply side, thereby ensuring air conditioning comfort. When such operation control is performed, the hot water supply capacity is not sufficient, so the hot water temperature imbalance between the hot water storage tank for boiling water and the hot water storage tank for hot water storage continues for a long time.
As a result, the above-mentioned problems are more likely to occur.

This invention was made in order to solve the above-mentioned conventional drawbacks, and its purpose is to provide a hot water supply system that can prevent the comfort of use from decreasing due to running out of hot water as described above. The purpose of the present invention is to provide a heat pump system having a system and a hot water supply function.

(Means for Solving the Problem) Therefore, in the hot water supply system according to the first aspect, as shown in FIG. 11, a hot water storage tank 12.13 for exclusive use of a hot water reservoir installed in parallel with this hot water storage tank 11, which also serves as a hot water heater, and a hot water storage tank 12. A water boiling control means 97 that outputs a hot water replacement command when the temperature of hot water in the hot water storage tank 12.13 is lower than a boiling standard hot water storage temperature (Doff-α), and otherwise outputs a heating stop command. , and a replacement means 96 for mutually replacing the hot water in both tanks 11, 12, 13 in response to the hot water replacement command, and further, the temperature of the hot water in the hot water storage tank 12.13 for hot water is replaced. A replacement control means outputs a hot water replacement command to the replacement means 96 when the hot water storage temperature is lower than the standard hot water storage temperature (Ds-α).

The hot water supply system according to the second aspect is characterized in that the first reference temperature Doff is variable from a lower temperature side to a higher temperature side than the replacement standard hot water storage temperature (Ds-α).

Furthermore, in the hot water supply system according to the third aspect, a season determination means 37 further determines whether or not it is a cold season.
It is characterized in that it is configured to allow the hot water replacement command to be output from the replacement control means 98 only during the cold season.

Further, in the heat pump system having a hot water supply function according to the fourth aspect, as shown in FIG. 4, a hot water supply system 8 that heats hot water using condensation of the refrigerant discharged from the compressor 51, and an operation control means 93 that performs heating and hot water supply operation control with priority given to heating operation. The hot water supply system 8 includes a hot water storage tank 11 in which hot water is heated by a heat exchanger 14 for hot water supply, and hot water storage tanks 12 and 13 exclusively for hot water storage installed in parallel with this hot water storage tank 11.
When the hot water in the hot water storage tank 11 for boiling water is boiled to the first reference temperature Doff, the temperature of the hot water in the hot water storage tank 12.13 for hot water storage becomes lower than the boiling reference hot water storage temperature (Doff-α). A water boiler control means 97 outputs a hot water replacement command when the temperature is low, while outputting a hot water supply operation stop command when it is not, and a water boiler control means 97 which outputs a hot water replacement command when the hot water replacement command is low; and a season determining means 37 for determining whether or not it is the heating season; and a season determining means 37 for determining whether or not it is the heating season; When the water is boiled up to the second standard temperature Ds set on the low temperature side, the hot water in the hot water storage tank 12.13 reaches the boiling standard hot water storage temperature (D
off-α), which outputs a hot water replacement command when the hot water storage temperature is lower than the replacement standard hot water storage temperature (Dsα).

(Function) In the hot water supply system according to the first aspect, the hot water temperature in the hot water storage tank 12.13 is set to the replacement standard hot water storage temperature (Ds
−α), a hot water replacement command is output. This command does not depend on the hot water temperature in the hot water storage tank 11 that also serves as a hot water heater, and is output until the hot water temperature in the hot water storage tank 12.13 for hot water storage reaches the replacement standard hot water storage temperature (Ds--α). , hot water replacement operations will be performed frequently. In this way, the hot water in all tanks 11 and 2.13 will gradually become hotter without causing a large temperature imbalance, and a large amount of hot water can be secured from the initial stage of heating. Become.

In the hot water supply system according to the second claim, when the first reference temperature Doff is higher than the replacement standard hot water storage temperature (Ds-α), the hot water temperature in all tanks 11, 12, 13 is the replacement standard hot water storage temperature. Until (Ds-α) is reached, hot water replacement operations are frequently performed in the same manner as above. And all tanks 11
When the hot water temperature inside reaches the replacement standard hot water storage temperature (Ds-α),
The water temperature in the water boiler tank 11 is the first reference temperature Doff.
The replacement operation is stopped until the temperature is reached, and then the water temperature in the hot water storage tank 12.13 reaches the boiling standard hot water storage temperature (
D.

ff-α), the replacement operation is performed.

Note that the water temperature in the water heater tank 11 is the first reference temperature Do.
If the hot water temperature in the hot water storage tanks 12 and 13 is not lower than the boiling standard hot water storage temperature (Doff-α) when the hot water temperature reaches ff, heating is stopped as if the entire amount has been boiled.

On the other hand, the first reference temperature Doff is the replacement reference hot water storage temperature (Ds
- α) If the temperature is lower than
The replacement operation will be performed until the hot water temperature in No. 1 reaches the first reference temperature Doff.

In the hot water supply system according to the third aspect, the control according to the first aspect is performed during the cold season when the discomfort caused by running out of hot water is especially increased.

Furthermore, in the heat pump system according to the fourth aspect, during the heating season, the replacement operation is performed at a lower temperature than before, and as a result, similarly to the above, hot water is supplied within a short time after the start of heating. This means that you can secure as much hot water as possible.

(Example) Next, specific examples of the hot water supply system and the heat pump system having a hot water supply function of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a schematic diagram of the overall configuration of a heat pump system having a hot water storage type hot water supply function and an air conditioning function. In the figure, 1 is an outdoor unit, and a compressor, an outdoor heat exchanger, etc. are housed in this outdoor unit 1.

Connected to the outdoor unit 1 are indoor units (air conditioning system) 2, 3, 4 each equipped with an indoor heat exchanger, and a hot water storage unit (hot water supply system) 8. The configuration of this hot water storage unit 8 will be explained in detail later. The operation of the hot water storage unit 8 is performed using a central remote control 9 (FIG. 7) installed in the kitchen or the like. The operation of circulating the refrigerant to each user-side device that requires operation while monitoring the entire heat pump system is controlled by an outdoor control device provided in the outdoor unit 1. In the following, a hot water heating operation in which refrigerant is circulated through the hot water storage unit 8 will be mainly explained. The details will be explained later.

Next, the configuration of the hot water storage unit 8 will be explained with reference to FIG. Inside this hot water storage unit 8, as shown in the figure,
Three cylindrical closed hot water storage tanks 11, 12, and 13 are arranged in parallel. Further, in the hot water storage unit 8, a hot water supply heat exchanger 14 composed of a double pipe with leakage detection is arranged, and a flow path outside the hot water supply heat exchanger 14 is used as a refrigerant flow path. gas side and legal refrigerant piping 15.1 on both ends.
6 are connected to each other, and the hot water supply heat exchanger 14 is connected to the outdoor unit 1 through these refrigerant pipes so that the refrigerant can circulate therein. In addition, the above-mentioned first
A water outgoing pipe 17 connected to the bottom of the hot water storage tank 11 and a water return pipe 18 are connected, and a circulation pump 19 is interposed in the water outgoing pipe 17, and this circulation pump 19 is operated. Accordingly, the hot water at the bottom side of the first hot water storage tank 11 is circulated through the hot water supply heat exchanger 14. In this way, the first hot water storage tank 11 is configured as a hot water storage tank that also serves as a water boiler and is equipped with a heating means consisting of the hot water supply heat exchanger 14, while the second and third hot water storage tanks 12 and 13 are equipped with heating means. It is not configured as a dedicated hot water storage tank.

On the other hand, in the figure, 21 is a water supply pipe, and this water supply pipe 21 is connected to an electromagnetic first three-way valve 22, and each switching port of this first three-way valve 22 is connected to a water supply branch pipe 23, 24.
Accordingly, the circulation pump 19 and the first hot water storage tank 11
It is connected to the water outgoing pipe 17 between them and the bottom of the third hot water storage tank 13, respectively. Note that the first three-way valve 2
Second, as will be described later, it has a function to switch the hot water tank.

The upper parts of the first hot water storage tank 11 and the second hot water storage tank 12 are respectively connected to a hot water supply pipe 25, while the upper part of the third hot water storage tank 13 and the bottom part of the second hot water storage pipe 12 are connected to each other by a connecting pipe 26. It is connected to the. Further, a replacement pipe 27 is connected to the bottom of the third hot water storage tank 13, and this replacement pipe 27 is interposed between the connection point of the circulation pump 19 and the water supply branch pipe 23 in the water pipe 17. It is connected to a second electromagnetic three-way valve 28. The replacement pipe 27, the circulation pump 19, the second three-way valve 28, and the like constitute a replacement means 96.

Further, on the outer wall surface of the first hot water storage tank 11, a first temperature sensor 31 consisting of a thermistor or the like is provided to detect the temperature of the hot water on the bottom side inside, and a second temperature sensor 31 is installed on the outer wall surface of the first hot water storage tank 11 to detect the temperature of the hot water on the top side. A temperature sensor 32 is attached to the bottom side and the top side, respectively. Similarly, a third temperature sensor 33 and a fourth temperature sensor 34 are attached to the bottom and top sides of the outer wall surface of the second hot water storage tank 12.
A fifth temperature sensor 35 is installed on the bottom side of the outer wall surface of the hot water storage tank 13.
are attached to each. A water supply temperature sensor (season determining means) 37 is provided in the upstream portion of the water supply pipe 21 from the first three-way valve 22 to determine whether or not it is the heating season by measuring the temperature of the water supply. There is. This water supply temperature sensor 37 is also constructed of a thermistor or the like.

In the figure, reference numeral 41 indicates a drainage pipe connected to the bottom of each hot water storage tank 11, 12, and 13. Manual on-off valves 42, . . . , 42 are interposed to shut off. Further, 43 and 44 are a flow switch and a pressure switch provided in the water outgoing pipe 17, and 45 is a pressure reducing valve provided in the water supply pipe 21;
6 indicates a mixing faucet where hot water is used.

Next, the refrigerant circuit of the heat pump system will be explained with reference to FIG. As shown in FIG. 4, this heat pump system includes an outdoor unit 1, the indoor units 2 to 4, and a hot water storage unit 8. The outdoor unit 1 is a compressor 5
1, and the discharge pipe 52 and suction pipe 52 of this compressor 51 are each connected to a four-way switching valve 54. Note that the compressor 51 has an inverter 55 for controlling its rotational speed, that is, its compression capacity.
Further, a first electromagnetic valve 56 is provided in the discharge pipe 52, and an accumulator 57 is provided in the suction pipe 53. The four-way switching valve 54 has a first gas pipe 58 and a second gas pipe 58.
Although the first gas pipe 58 is connected to the gas pipe 59,
is connected to the outdoor heat exchanger 60, and the second gas pipe 5
9 is connected to the header 61, and a gas shutoff valve 62 is interposed in the middle. In addition, the outdoor heat exchanger 6
0 is connected to a first liquid pipe 63, and this first liquid pipe 63 is connected to a liquid receiver 64, and a first expansion valve 65 is interposed in the middle thereof.

A second liquid pipe 66 is connected to the liquid receiver 64, and this second liquid pipe 66 has a liquid shutoff valve 67 interposed in the middle, and is connected to the second gas pipe 69. A plurality of branch refrigerant pipes 68 (three in the case of the figure) are connected to the second liquid pipe 66.
...6 days are connected in parallel to each other, and each branch refrigerant pipe 68...68 has an indoor heat exchanger 69...69, respectively.
(only one is shown) and second expansion valves 70...70 are interposed. Although each of the indoor units 2 to 4 is illustrated for only one indoor unit 2, the above-mentioned indoor heat exchanger 69...
69 and indoor fans 71...71.

On the other hand, a third gas pipe 72 is further connected to the discharge pipe 52 of the compressor 51, and a hot water supply heat exchanger 14 is connected to the third gas pipe 72. is further connected to the liquid receiver 64 through a third liquid pipe 74. A second electromagnetic valve 75 is interposed in the third gas pipe 724, and a capillary tube 76 and a check valve 77 are interposed in the third liquid pipe 74.

In the branch refrigerant pipes 68...68, seventh temperature sensors 79...79 are attached at positions between each of the indoor heat exchangers 69...69 and the second expansion valves 70...70. However, the seventh temperature sensors 79...79 are for detecting the temperature of the liquid refrigerant condensed in the indoor heat exchangers 69...69 during heating operation. In addition, the third liquid pipe 7
4, an eighth temperature sensor 80 is also installed at a position between the hot water supply heat exchanger 14 and the check valve 77. This is for detecting the temperature of the liquid refrigerant condensed in the trowel inside the vessel 14.

During heating operation of the heat pump system, the first solenoid valve 56 is opened, the second solenoid valve 75 is closed, and the compressor 51 is operated. Then, the refrigerant passes through the four-way switching valve 54 and the second gas pipe 59, condenses in each indoor heat exchanger 69...69, and then passes through the second liquid pipe 66 and the first liquid pipe 63. is evaporated in the outdoor heat exchanger 60, and then the first gas pipe 5
8, the flow is returned to the compressor 51 via the four-way switching valve 54.

During hot water supply operation, the compressor 51 is operated by closing the first solenoid valve 56 and opening the second solenoid valve 75.

Then, the refrigerant passes through the third gas pipe 72 and condenses in the hot water heat exchanger 14, and then passes through the third liquid pipe 74, the liquid receiver 64, and the first liquid pipe 63 to the outdoor heat exchanger. 10, and then returns to the compressor 51 through the first gas pipe 58 and the four-way switching valve 54 in the same manner as described above.

When heating and hot water supply are to be performed simultaneously, both the first solenoid valve 56 and the second solenoid valve 75 are opened, and the refrigerant discharged from the compressor 51 is transferred to the indoor heat exchanger 69 and the hot water supply. It is supplied to both the heat exchanger 14 in parallel.

Note that the cooling operation in the heat pump system is performed by switching the four-way switching valve 54 and circulating the refrigerant from the outdoor heat exchanger 60 side to the indoor heat exchanger 69 side,
In addition, in the cooling/hot water supply operation, the refrigerant discharged from the compressor 51 is condensed in the hot water supply heat exchanger 14 via the third gas pipe 72, and then the third liquid pipe 74, the liquid receiving pipe 64, The liquid is evaporated in each indoor heat exchanger 69 . . . 69 via the second gas pipe 66, and then circulated in a circuit that returns to the compressor 51 via the second gas pipe 59 and the four-way switching valve 54. It is done by letting.

Next, the operation control system of the above-mentioned pump system will be explained based on FIG. 5. First, the outdoor unit 1 has an outdoor control device 81 and an inverter control device 82, and this inverter control device 82 is connected to the inverter 55.
This is to control the frequency at which the compressor 51 rotates, that is, the rotation speed of the compressor 51.

The outdoor control device 81 also includes the seventh temperature sensor 7.
9...79 and the temperature detected by the eighth temperature sensor 80 is input. Reference numeral 83 denotes a valve switching means, which controls the operation of the first solenoid valve 56, second solenoid valve 75, four-way switching valve 74, etc. in response to a command from the outdoor control device 81. This is to control operating states such as heating operation, hot water supply operation, simultaneous heating and hot water supply operation, etc. The outdoor control device 81 is also connected to the centralized remote controller 9 placed indoors such as the kitchen, and by operating a hot water tank heating switch 85 provided on the remote controller 9, a hot water tank heating request signal is sent. The output is as follows. In this case, the hot water storage tanks 11 to 13 include the first
~fifth temperature sensors 31 to 35 are arranged, and when the hot water storage tank heating request signal is output and there is an operation request signal from the first to fifth temperature sensors 31 to 35, the outdoor control device 81 is activated. In response, a hot water supply operation request signal is output.

On the other hand, each of the indoor units 2 to 4 has an indoor control device 87, and each indoor control device 87 has a heating switch 88.
, a cooling switch 89, a room temperature setting switch 90, and an indoor thermostat 91. Each indoor control device 87 sends a heating request signal, a cooling request signal, and an indoor thermostat 91 to the outdoor control device 81 to control air conditioning. request or stop signal;
A T signal is output based on the temperature difference between the room temperature and the set temperature. In the outdoor control device 81, the load understanding circuit 92 is configured to calculate the sum ΣΔT of the T signals from the indoor units 2 to 4 during operation.

Next, regarding the operation control method of the heat pump system, in a state where a heating operation is requested (a state where a heating request signal is output from the heating switch 88 and an air conditioning request signal is output from the indoor thermostat 91), a hot water supply operation is requested. In some cases (the hot water tank heating request signal is output by the hot water tank heating switch 85, and the first to fifth temperature sensors 31 to 3
The operation control method in the state where there is an operation request signal from 5) will be explained based on FIG. 6. First step S1
, it is determined whether there is a heating request or not.
In the case of S, it is determined in the next step S2, and in the case of NO, in step S3, it is determined whether or not there is a hot water supply request. If step S2 is NO, a heating independent operation is started in step S4, and this operation is continued until an air conditioning stop signal is output from the indoor thermometer 91 (step S5), and the process returns to step S1. Further, if step S3 is NO, the process directly returns to step S1,
On the other hand, in the case of YES, hot water supply independent operation is performed in step S6. This hot water supply operation continues until there is a heating request signal (step S7) or until the operation requests from the first to fifth temperature sensors 31 to 35 as hot water temperature thermometers are turned off (step S8), When the hot water supply operation is ended (step S9), the above step S
Return to 1. Note that as in step S8 above, the first to fifth
Not only when the operation requests from all temperature sensors 31 to 35 are F, but also when the first and third hot water storage tanks 11
and the first and second temperature sensors 31 and 32 provided at 13.
If the operation request from the fifth temperature sensor 35 is turned off, it is also possible to determine that boiled hot water is stored in all of the hot water storage tanks 11 to 13. In addition, the hot water supply operation mentioned above refers to a water boiling operation that boils hot water in the first hot water storage tank 11 that also serves as a hot water heater, and a water boiling operation that boils hot water in the first hot water storage tank 11 that also serves as a hot water heater, and a hot water operation that boils hot water in the first hot water storage tank 11 to the second and third hot water storage tanks 11 that are dedicated to storing hot water.
．． 13.

On the other hand, if step S2 is YES, that is, if there are both requests for heating operation and hot water supply operation, then in step 510, the following values 1 to 2 are read out. In other words, ■ the temperature difference Δ between the room temperature and the set temperature in the indoor units 2 to 4 during operation;
T, ■ Seventh temperature sensor 7 in indoor units 2 to 4 during operation
9 detected temperature TLI...TL4, (2) detected temperature TCA of the eighth temperature sensor 80 during the previous hot water supply operation. Note that the temperature TCA detected by the eighth temperature sensor 80 is detected and stored each time the water supply operation is performed, and the previous TCA is read out when the process moves to step S10. Then, in subsequent steps 31 to S13, other (1) to (3) are determined based on the above-mentioned items, and only when all of (1) to (3) are satisfied, heating is performed in step SI4. - Simultaneous operation of hot water supply is performed, and in other cases, the process moves to step S4 and individual heating operation is performed.

(1) The total ΔT of indoor units 2 to 4 during heating operation, that is, the absolute value of ΣΔT, is smaller than a reference value (for example, 2° C.) (step 511).

This determines whether the heating load on the indoor units 2 to 4 during heating operation is smaller than a reference value. In other words, if heating and hot water supply are operated simultaneously when the heating load is heavy, heating capacity may be insufficient and comfortable air conditioning may be impaired. , to prevent this.

(2) TCA of indoor units 2 to 4 during heating operation
It is less than or equal to the maximum value TLn of LI to TL4 (step 512).

This is because in a state where the condensed refrigerant temperature on the hot water supply heat exchanger 14 side is higher than the condensed refrigerant temperature on the indoor heat exchanger 69 side, the refrigerant condensation temperature is higher than the condensed refrigerant temperature on the heating indoor heat exchanger 69 side.
This is because the non-condensable refrigerant that does not exchange heat passes through the hot water supply heat exchanger 14, which not only prevents hot water from being heated, but also disturbs the refrigeration cycle and reduces efficiency.

(3) TCA is within the standard temperature range (e.g. 20°C≦TC
A<Tmax) (step 513).

This is TCA, which means that when the temperature of the hot water to be heated is lower than 20°C, the hot water supply load becomes excessive, causing a cold draft, and indoor units 2 to 4 have to reduce the blowout temperature. In order to prevent this, heating and hot water supply are operated simultaneously when the TCA is above the standard value. Note that the upper limit value Tmax of TCA is set in consideration of the heat resistance limit of equipment such as piping and ensuring the efficiency of the refrigeration cycle.

These steps S11 to 514 and step S4 constitute the operation control means 93. Note that the simultaneous heating and hot water supply operation in step 514 is performed by an air conditioning stop signal (step 515) from the indoor thermometer 91 and a heating stop signal (step 515) from the first to fifth temperature sensors 31 to 35.
Step S16) is performed until either one of step S16) is output.

As described above, the air conditioning load (absolute value of ΣΔT) on the indoor units 2 to 4 side is smaller than the reference value, and the load on the hot water supply side, that is, the temperature TCA of the hot water to be heated, is on the indoor heat exchanger 69 side. The temperature of the condensate refrigerant is below TLn, and the reference temperature (20°C
) or above, the heating and hot water supply operations are performed simultaneously, so that the simultaneous operation can be performed with high efficiency while maintaining a comfortable heating state.

Next, the operation control system of the hot water storage unit 8 will be explained with reference to FIG. As shown in the figure, a hot water supply control device 9 is installed in the hot water storage unit 8.
4 is provided, and to this hot water supply control device 94, the set temperature Doff of the above-mentioned central remote controller 9 is input, and the temperatures detected by the above-mentioned temperature sensors 31 to 35 are input. The first and second three-way valves 2 described above based on these
The hot water supply control device 94 performs the switching of 2.28, the operation of the circulation pump 19, and the transmission of a hot water supply operation request signal to the outdoor control device 81 provided in the outdoor unit 1. Hereinafter, with reference to the control flowchart of FIG. 8, the control during the water boiling operation and the transfer operation included in the hot water supply operation will be described.

Step S20 in FIG. 8 is an initial setting step of keeping the second three-way valve 2 OFF, thereby maintaining the suction side of the circulation pump 19 in communication with the bottom of the first hot water storage tank 11. There is. The next step S21 is a step of comparing the temperature D- detected by the water supply temperature sensor 37 in FIG. and
If it is the heating season (YES) in which Dw is less than 15°C, the process proceeds to step S22; otherwise, the process proceeds to step S23.

First, in a case other than the heating season, in step S23, the temperature TI detected by the first temperature sensor 31 is set to the thermoset temperature (first reference temperature) Doff (for example, 60°
Determine whether or not it is higher than C), and if NO,
In step S24, a hot water supply operation request signal is output to the outdoor control device 81, and at the same time, the operation of the circulation pump 19 is started. In this state, the detected temperature TI at the first temperature sensor 31
continues until the temperature reaches or exceeds the thermoset temperature Doff (
Step 523). As a result, the outdoor control device 81 supplies the refrigerant discharged from the compressor 51 to the hot water supply heat exchanger 14, and then returns it to the compressor 51 via the outdoor heat exchanger 60 in a hot water heating operation. At the same time, heating operation of hot water in the first hot water storage tank 11 is started. Through this heating operation, the hot water in the first hot water storage tank 11 is circulated through the outgoing water pipe 17 and the returning water pipe 18,
At this time, heat of condensation of the refrigerant is applied by the hot water supply heat exchanger 14 and is returned to the bottom of the first hot water storage tank 11. In the first hot water storage tank 11, this hot water generates convection and replaces the low temperature hot water on the upper side, and as the hot water supply heating operation continues, high temperature hot water gradually flows into the first hot water storage tank 11 from the upper side. will be replaced by Then, when the temperature T1 detected by the first temperature sensor 31 becomes equal to or higher than the thermoset temperature Doff, the process moves to step S33. Note that the specific control contents after step S33 will be described later.

On the other hand, in the heating season, the process moves to step S22, and it is determined whether the temperature TI detected by the first temperature sensor 31 is less than the thermoset temperature Doff. If NO, the process proceeds to step S33 as described above. and then YES again.
In this case, the process moves to the next step S25. Step S
25, the temperature T1 detected by the first temperature sensor 31 is D
Transfer start temperature when iv<15°C (second reference temperature)
It is determined whether or not the temperature is less than Ds (for example, about 45° C.), and if YES, the process moves to step 531, and hot water heating operation is performed while operating the circulation pump 19 in the same manner as described above. In this operation, in step S25, TI≧
The process continues until Ds, but if T1≧Ds, the process moves to the next step S26.

In step S26, the detected temperature T5 of the fifth temperature sensor 35 attached to the bottom of the third hot water storage tank 13 is compared with the transfer start set temperature (replacement standard hot water storage temperature) (Ds-α), and T5 is ( If it is lower than Ds-a), a transfer operation is performed. That is, in step S27, 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 third hot water storage tank 13 through the replacement piping 27, and as a result, as shown by the solid arrow in the third cycle, the temperature at the bottom of the third hot water storage tank 13 is low. Hot water is sucked into the circulation pump 19 and injected into the bottom of the first 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 injected amount is pushed out from the upper part of the first hot water storage tank 11, and the hot water from the second hot water storage tank 12 is pushed out from the upper part of the second hot water storage tank 12 through the connecting pipe 26 to the third hot water storage tank. 13, a push-type movement occurs sequentially to transfer and generally replace the hot water.

This transfer operation is started when T5 reaches a high temperature state of the transfer end first set temperature (Ds-β) in step S28, or when the temperature is detected by the second temperature sensor 32 of the first hot water storage tank 11 in step S29. When the temperature T2 becomes lower than the transfer end second set temperature (Ds-γ), that is, all the hot water boiled in the first hot water storage tank 11 is transferred to the second and third
The process is stopped when it is determined that the hot water has been transferred to the hot water storage tank 12.13 side, and in the next step S30, the second three-way valve 28 is turned off, and the process moves to the next step S31 and step S32. be exposed.

Then, in step S32, the first temperature sensor 31
It is determined whether the detected temperature TI is equal to or higher than the thermoset temperature Doff, and if YES, the next step S3
If not (NO), the process returns to step S25 and steps S25 to S32 are executed.
Repeat. In other words, the steps 525 to 32 are performed until the hot water at the transfer set temperature Ds is stored in the second and third hot water storage tanks 12.13 and the hot water temperature T1 in the first hot water storage tank 11 reaches the thermoset temperature Doff. We will continue to do so.

From step 533 to step S37, from the first hot water storage tank 11 whose temperature has exceeded the thermoset temperature Doff, to the second hot water storage tank 11,
The processing procedure for transferring hot water to the third hot water storage tank 12.13 is shown, but this is substantially the same concept as steps 526 to 30 described above. In other words, while steps 526 to S30 above show the transfer procedure when the detected temperature T1 of the first temperature sensor 31 reaches the transfer set temperature Ds when Dw<15°C,
Steps 533 to S37 show the transfer procedure when the detected temperature TI of the first temperature sensor 31 reaches the thermoset temperature Doff.
~Step S37 is step 326~step S30
is the same as when Ds is changed to Doff, and the set transfer start temperature (boiling standard hot water storage temperature) in this case is:
(Doff-α).

Note that when the boiling operation and transfer operation are repeated and all the hot water storage tanks 11 to 13 are stored with hot water at a temperature higher than the set temperature Doff, the process moves from step S33 to step 538 and a hot water supply operation is requested. After stopping the generation of the signal and stopping the operation of the circulation pump 19 in step S39, the process returns to step 521, and thereafter the above control is repeated.

If the above control is carried out, in the heating season, the hot water in the first hot water storage tank 11 is first heated to the transfer set temperature Ds of about 45°C (step 525), and then this is heated to the second and third hot water storage tanks. Transferred to 12.13 (
Step S26 to Step 530). Thereafter, the hot water in the first hot water storage tank 11 is further heated until it reaches the thermoset temperature Doff (step S32), and is again transferred to the second and third hot water storage tanks 12, 13 (
Steps S33 to S37), and finally the hot water in the first hot water storage tank 11 is heated to about the thermoset temperature Doff (step 532). Furthermore, when it is not the heating season, the hot water in the first hot water storage tank 11 is heated to the thermoset temperature Doff (step S23), and is transferred to the second and third hot water storage tanks 12.13 (steps 333 to 3).
37) Eventually, the hot water in the first hot water storage tank 11 is heated to about the thermoset temperature Doff (step 523).

As mentioned above, during the heating season, relatively low temperature hot water is first stored in all tanks 11, 12, 13, and then the temperature is raised sequentially. Hot water at a certain temperature is stored only in the hot water storage tank 11, and the other second and third hot water storage tanks 1
It is possible to prevent the occurrence of an unbalanced situation in which 2. and 3.

Although specific embodiments of the heat pump system of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various changes within the scope of the present invention.

For example, in the above embodiment, the operation control means 93
Steps SL1 to S14 and Step S4 in the figure
The boiling water control means 97 is constructed from steps 532 to 538 in FIG. 8, and the replacement control means 98 is constructed from steps 325 to S30 in the figure, but these constructions also have similar functions. It can be changed arbitrarily within the scope of performance. Furthermore, in the hot water supply system according to the first aspect, the heating means is not limited to the hot water supply heat exchanger 14;
A heater or the like may be used, or steps S25 and S29 may be omitted in the replacement control means 98, and the replacement reference hot water storage temperature (Osα)
It is also possible to set it to a higher temperature than the boiling standard hot water storage temperature (Doff-α). Furthermore, in both the third and fourth claims, the season determining means is not limited to the water supply temperature sensor 37, but it is also possible to use an outside air temperature sensor or a heating operation request signal.

(Effect of the invention) The hot water supply system according to the first to third claims, and the fourth claim.
In the heat pump system having the hot water supply function as described in the claims, it is possible to configure a system capable of supplying a large amount of hot water at a certain temperature within a short time, and therefore the problem of running out of hot water can be reduced. The comfort of use during hot water supply can be improved.

In particular, in the hot water supply system according to the third aspect and the heat pump system according to the fourth aspect, fine control can be performed to prevent the hot water running out in cold seasons such as winter when discomfort due to running out of hot water increases. become.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram showing the overall configuration of the present invention, Fig. 2 is an overall schematic diagram of the heat pump system, Fig. 3 is a piping system diagram of the hot water supply unit, Fig. 4 is a refrigerant piping diagram of the heat pump system, and Fig. 5 is a diagram of the piping system of the heat pump system. Figure 6 is a block diagram of the operation control system of the heat pump system, Figure 6 is a flowchart diagram showing the control of the operation control system, Figure 7 is a diagram showing the operation control system of the hot water supply unit, and Figure 8 is a flowchart diagram showing the control of the hot water supply unit. It is. 2.3.4... Indoor unit (air conditioning system), 8... Hot water storage unit (hot water supply system), 11... First hot water storage tank (hot water storage tank that also serves as a water heater), 12.13... Second,
3rd hot water storage tank (hot water storage tank exclusively for hot water storage), 14...
Heat exchanger for hot water supply (heating means), 37... Water supply temperature sensor (season determination means), 51... Compressor, 93...
- Operation control means, 96... Substitution means, 97... Water boiling control means, 98... Substitution control means, Do, ff...
・First reference temperature, Ds...Second reference temperature, Doff
-α... Boiling standard hot water storage temperature, Ds-α... Replacement standard hot water storage temperature. Patent issuer

Claims (4)

[Claims] 1. A heating means (14), a hot water storage tank (11) for boiling hot water in the heating means (14), and a hot water storage tank (11) exclusively for hot water, which is arranged in parallel with the hot water storage tank (11). (12) and (13), when the hot water in the hot water storage tank (11) that also serves as a hot water boiler is boiled to the first reference temperature (Doff), A water boiling control means (97) that outputs a hot water replacement command when the temperature is lower than the boiling standard hot water storage temperature (Doff-α), and outputs a heating stop command if not, and a water boiling control means (97) that receives the hot water replacement command. and a replacement means (96) for mutually replacing the hot water in both tanks (11), (12), and (13); A hot water supply system characterized by comprising: a replacement control means (98) that outputs a hot water replacement command to the replacement means (96) when the temperature is lower than a replacement standard hot water storage temperature (Ds-α). 2. The hot water supply system according to claim 1, wherein the first reference temperature (Doff) is variable from a lower temperature side to a higher temperature side than the replacement standard hot water storage temperature (Ds-α). 3. It is further provided with a season determination means (37) for determining whether or not it is the cold season, and is configured to allow the output of the hot water replacement command from the replacement control means (98) only when it is the cold season. A hot water supply system according to claim 1. 4. An air conditioning system (2) that performs heating operation and cooling operation using condensation and evaporation of refrigerant discharged from a compressor (51).
~4), a hot water supply system (8) that heats hot water using condensation of the refrigerant discharged from the compressor (51), and an operation control means (93) that performs heating and hot water supply operation control with priority given to heating operation. ), the hot water supply system (8) comprises: a hot water storage tank (11) which serves as a hot water heater and a hot water storage tank (11) in which hot water is heated by a hot water supply heat exchanger (14); The hot water tank (12) (13) installed in parallel and the hot water storage tank (12) that also serves as a hot water boiler (13)
1) When the hot water in the tank is boiled to the first reference temperature (Doff), the temperature of the hot water in the hot water storage tanks (12) and (13) is lower than the boiling standard hot water storage temperature (Doff-α). A water boiler control means (97) outputs a hot water replacement command when the temperature is low, and outputs a hot water supply operation stop command when it is not low, and a water boiler control means (97) that outputs a hot water replacement command when the water replacement command is low, and a water boiling control means (97) that outputs a hot water replacement command when the hot water replacement command is low, and a water boiling control means (97) that outputs a hot water replacement command when the hot water replacement command is low.
)(12) and (13), and further includes a season determining means (37) for determining whether or not it is the heating season, and when it is the heating season, When the hot water in the water heater/storage tank (11) is boiled to a second reference temperature (Ds) set lower than the first reference temperature (Doff), the hot water storage tank (12) (13) Replacement control means ( 98) A heat pump system having a hot water supply function.