JP5150225B2 - Heat pump system - Google Patents

Description

  The present invention relates to a heat pump system that performs hot water supply and air conditioning using a heat pump cycle.

The heat pump cycle is a heat cycle in which heat is raised from a low-temperature heat source to raise the temperature, and a temperature raising device using the heat pump cycle is more efficient than a temperature raising device using Joule heat such as an electric heater.
In recent years, there has been known a heat pump system in which a heat storage device is added to a heat pump circuit, heat is stored in the heat storage device using inexpensive nighttime electric power, and a higher economic effect is exhibited. Furthermore, not only using the high temperature side of the heat pump cycle but also using a low temperature generated on the cooling side of the heat pump cycle to generate cold water (Patent Document 1).
That is, the invention disclosed in Patent Document 1 includes a heat pump circuit and two hot water storage tanks. The heat pump circuit includes a compressor, a first heat exchanger, a first decompressor, a second heat exchanger, a second decompressor, and an outdoor unit. In the heat pump circuit employ | adopted by patent document 1, a 1st heat exchanger will be in a high temperature state, and a 2nd heat exchanger will be in a low temperature state. And a heat medium and water are heat-exchanged with a 1st heat exchanger and a 2nd heat exchanger, respectively, and warm water and cold water are made.
The hot water made by the first heat exchanger is stored in the first tank, and the cold water made by the second heat exchanger is stored in the second tank.
JP 2005-180836 A

  Using high temperature generated by the heat pump cycle to generate high temperature water for bath and hot water supply, generating cold water on the low temperature side and using it for cooling, use both the high and low temperatures generated by the heat pump Is efficient.

Here, in the heat pump system, the period during which cold water is used is limited, and the demand for cold water is low in winter. Therefore, it is not necessary to generate cold water in winter.
However, in the heat pump system disclosed in Patent Document 1, water stays on the secondary side of the second heat exchanger even when cold water is not produced. Therefore, in the heat pump system disclosed in Patent Document 1, when the water flow to the second heat exchanger is stopped, the water remaining in the second heat exchanger freezes, and the second heat exchanger is damaged. End up. Further, even if water is passed through the secondary side of the second heat exchanger, the generated cold water is not consumed, so the temperature of the cold water passing through the second heat exchanger gradually decreases and eventually freezes.

  Therefore, in the heat pump system disclosed in Patent Document 1, in order to prevent the second heat exchanger from freezing, the second heat exchanger is heated by another heat source, or hot water is supplied to the secondary side of the second heat exchanger. There is a problem in that the COP (coefficient of performance) in the winter is reduced.

  In winter, warm air or hot water generated in the heat pump cycle is often sent directly to the heating terminal for heating, but such a type of heating device has a drawback that the rise of the heating temperature is slow.

That is, since the amount of heat consumed is large in the winter season, when heating is performed, the heat pump circuit is operated, and the generated hot water is sent to the heating device without being stored in the hot water storage tank to perform heating. The amount of heat per unit time required for the heating steady state is much smaller than the hot water supply to the bath, so that heating can be covered only with the heat generated by the heat pump circuit.
However, generally, when operating a heat pump circuit to generate hot water, the temperature rising rate of the generated hot water is slower than that of a combustion device such as a burner. Therefore, it takes time until the heating terminal actually performs the heating function.
If the hot water stored in the hot water storage tank is used for heating, the start-up of the heating will be quick, but the heating will be performed for a long time. There is not enough water to drop in the bath. If the capacity of the hot water storage tank is increased, heating and hot water supply can be provided, but the capacity of the hot water storage tank becomes unnecessarily large, which makes it difficult to install the hot water storage tank. Furthermore, if the hot water stored in the hot water storage tank is used for heating, the temperature stratification in the hot water storage tank will collapse.

  Accordingly, the present invention pays attention to the above-mentioned problems of the prior art, and provides a heat pump system having a high COP (coefficient of performance) that is free from fear of freezing even in winter, and has a quick temperature rise during heating. It is an object to do.

In order to solve the above-mentioned problems, the invention of claim 1 includes a water circulation circuit connected to a storage tank for storing hot water and flowing hot water, a compressor, a first heat exchanger, expansion means, and at least one of A heat pump circuit that connects the evaporator and circulates the heat medium, and the first heat exchanger performs heat exchange between the heat medium of the heat pump circuit and the water of the water distribution circuit to thereby form water in the water distribution circuit. At least one of the evaporators is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water circulation circuit to cool the water of the water circulation circuit, The circulation circuit can form a hot water circulation channel including a storage tank and a first heat exchanger, and a cold water circulation channel including a storage tank and a second heat exchanger, and the heat pump circuit includes the first 2 Bypass passage is provided to bypass the heat exchanger Is, when the heat exchange by the second heat exchanger is not required, the heat medium is passed through the bypass flow path, the heat pump circuit, downstream of the bypass passage, a plurality of evaporators arranged in parallel And a blower capable of blowing air to the plurality of evaporators, and the plurality of evaporators exchange heat between the air blown from the blower and the heat medium of the heat pump circuit to obtain a heat medium of the heat pump circuit. A third heat exchanger to be heated, and the amount of heat exchange in the third heat exchanger is adjusted by switching the number of third heat exchangers through which the heat medium flows, and is cooled by the second heat exchanger. The temperature detecting means for detecting the temperature of the water in the water circulation circuit, and the rotational speed of the blower is reduced on condition that the detected temperature detected by the temperature detecting means is higher than the target temperature. Heat pump system And a part was characterized Rukoto.

In the heat pump system according to the first aspect, when the second heat exchanger is not used, the heat medium is not passed through the second heat exchanger, so that the accumulated water in the water circulation circuit is cooled by the second heat exchanger. It is possible to prevent freezing of stagnant water in the water circulation circuit.
Moreover, the heat pump system of Claim 1 can suppress the fall of warm water production | generation efficiency by bypassing a 2nd heat exchanger, and can improve COP (coefficient of performance).

Here, the heating amount for the heat medium circulating in the heat pump circuit is the sum of the heating amount in the second heat exchanger and the heating amount in the third heat exchanger.
  The heat pump system according to claim 1 can adjust the amount of heating of the heat medium flowing in the heat pump circuit by increasing or decreasing the number of third heat exchangers through which the heat medium flows. Since the temperature and pressure of the heat medium in the heat pump circuit can be suppressed without changing the rotational speed of the compressor, the durability of the compressor is ensured while maintaining the ability to generate cold water in the second heat exchanger. can do.
  For example, even if the heating amount in the second heat exchanger is reduced by bypassing the second heat exchanger, the reduced heating amount can be compensated for by increasing the number of third heat exchangers. In addition, since the burden on the compressor is large when the amount of heating to the heat medium is large, reducing the number of third heat exchangers can reduce the amount of heat to the heat medium and improve the durability of the compressor. Is possible.
If the detected temperature is lower than the target temperature, the heat pump system according to claim 1 determines that the temperature of the heat medium circulating in the heat pump circuit is too low, and increases the rotational speed of the blower. Thereby, the heating amount in the 3rd heat exchanger to the heat carrier which circulates through a heat pump circuit increases, and a heat carrier is heated up. Therefore, the cooling of water in the second heat exchanger is weakened, and the temperature of the water cooled in the second heat exchanger can be brought close to the target temperature.

According to a second aspect of the present invention, in the first aspect of the invention, the heat pump control unit increases the number of third heat exchangers through which the heat medium is passed on condition that the rotational speed of the blower exceeds a predetermined upper limit value. It was characterized by letting it.

In general, the range of rotation of the blower is controlled by each blower.
  The heat pump system according to claim 2 is a third heat exchanger to a heat medium circulating in the heat pump circuit by increasing the number of third heat exchangers even when, for example, the upper limit of the rotational capacity of the blower is exceeded. The amount of heating in can be increased. As a result, the control range of the heating amount for the third heat exchanger is expanded to the higher side, so that the temperature of the water cooled by the second heat exchanger is increased by raising the temperature of the heat medium to weaken the cooling in the second heat exchanger. Can be brought close to the target temperature. Of course, the predetermined upper limit value is not limited to the rotational capacity of the blower and can be set arbitrarily.

Invention of Claim 3 is detected by the temperature detection means which detects the temperature of the water of the water distribution circuit cooled by the said 2nd heat exchanger in the invention of Claim 1 or 2, and the said temperature detection means. And a heat pump controller that reduces the rotational speed of the blower on the condition that the detected temperature is higher than the target temperature.

If the detected temperature is higher than the target temperature, the heat pump system according to claim 3 determines that the temperature of the heat medium circulating in the heat pump circuit is too high, and reduces the rotational speed of the blower. Thereby, the heating amount in the 3rd heat exchanger to the heat carrier which circulates through a heat pump circuit decreases, and the temperature of a heat carrier falls. Therefore, the cooling of the water in the second heat exchanger is further increased, and the temperature of the water cooled in the second heat exchanger can be brought close to the target temperature.

According to a fourth aspect of the present invention, a water circulation circuit connected to a storage tank for storing hot water and flowing hot water, and a compressor, a first heat exchanger, expansion means, and at least one evaporator are connected to generate heat. A heat pump circuit for circulating the medium, wherein the first heat exchanger heats water between the heat medium of the heat pump circuit and the water of the water circulation circuit to heat the water of the water circulation circuit, and the evaporator At least one is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water distribution circuit to cool the water of the water distribution circuit. A hot water circulation channel including a first heat exchanger and a cold water circulation channel including a storage tank and a second heat exchanger can be formed, and the heat pump circuit bypasses the second heat exchanger. Bypass channel is provided, by the second heat exchanger When replacement is not necessary, a heat medium is caused to flow through the bypass flow path, and the heat pump circuit is connected to the plurality of evaporators arranged in parallel downstream of the bypass flow path and the plurality of evaporators. The plurality of evaporators are third heat exchangers that heat the heat medium of the heat pump circuit by exchanging heat between the air from the fan and the heat medium of the heat pump circuit. The amount of heat exchange in the third heat exchanger is adjusted by switching the number of third heat exchangers through which the heat medium flows, and the temperature of the water in the water circulation circuit cooled by the second heat exchanger wherein temperature detection means for detecting, on the sensed temperature detected condition that is higher than the target temperature, which is targeted by the temperature detecting means, further comprising a heat pump control unit for reducing the rotational speed of the blower It was.

According to a fifth aspect of the present invention, in the third or fourth aspect of the invention, the heat pump control unit is configured such that the number of third heat exchangers through which the heat medium flows is provided on the condition that the rotational speed of the blower is below a predetermined lower limit value. It was characterized by decreasing.

In the heat pump system according to the fifth aspect, for example, even when the rotation speed of the blower reaches a controllable lower limit, the number of the third heat exchangers is decreased to reduce the third heat medium to the heat medium circulating in the heat pump circuit. The amount of heating in the heat exchanger can be reduced. As a result, the control range of the heating amount for the third heat exchanger is expanded to the lower side, so that the cooling in the second heat exchanger is further strengthened by lowering the temperature of the heat medium, and the water cooled in the second heat exchanger Can be brought close to the target temperature. The predetermined lower limit value can be set arbitrarily.

According to a sixth aspect of the present invention, a water circulation circuit connected to a storage tank for storing hot water and flowing hot water, and a compressor, a first heat exchanger, expansion means, and at least one evaporator are connected to generate heat. A heat pump circuit for circulating the medium, wherein the first heat exchanger heats water between the heat medium of the heat pump circuit and the water of the water circulation circuit to heat the water of the water circulation circuit, and the evaporator At least one is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water distribution circuit to cool the water of the water distribution circuit. A hot water circulation channel including a first heat exchanger and a cold water circulation channel including a storage tank and a second heat exchanger can be formed, and the heat pump circuit bypasses the second heat exchanger. Bypass channel is provided, by the second heat exchanger When replacement is not necessary, a heat medium is caused to flow through the bypass flow path, and the heat pump circuit is connected to the plurality of evaporators arranged in parallel downstream of the bypass flow path and the plurality of evaporators. The plurality of evaporators are third heat exchangers that heat the heat medium of the heat pump circuit by exchanging heat between the air from the fan and the heat medium of the heat pump circuit. The amount of heat exchange in the third heat exchanger is adjusted by switching the number of third heat exchangers through which the heat medium flows, and the temperature of the water in the water circulation circuit cooled by the second heat exchanger And a heat pump for increasing the number of third heat exchangers through which the heat medium is passed on condition that the detected temperature detected by the temperature detecting means is lower than the target temperature. With control It was characterized by comprising.

If the detected temperature is lower than the target temperature , the heat pump system according to claim 6 determines that the temperature of the heat medium circulating in the heat pump circuit is too low, and increases the number of third heat exchangers. Thereby, the heating amount in the 3rd heat exchanger to the heat carrier which circulates through a heat pump circuit can be increased. And since the control range of the heating amount for the third heat exchanger is expanded to the higher side, the temperature of the water cooled by the second heat exchanger is weakened by increasing the temperature of the heat medium to weaken the cooling in the second heat exchanger. Can be brought close to the target temperature.

The invention of claim 7 is the invention of claim 6 , wherein the temperature detection means for detecting the temperature of water in the water circulation circuit cooled by the second heat exchanger, and the detected temperature detected by the temperature detection means And a heat pump controller that increases the number of third heat exchangers through which the heat medium flows, on condition that the temperature is lower than the target temperature.

  If the detected temperature is lower than the target temperature, the heat pump system according to claim 7 determines that the temperature of the heat medium circulating in the heat pump circuit is too low, and increases the number of third heat exchangers. Thereby, the heating amount in the 3rd heat exchanger to the heat carrier which circulates through a heat pump circuit can be increased. And since the control range of the heating amount for the third heat exchanger is expanded to the higher side, the temperature of the water cooled by the second heat exchanger is weakened by increasing the temperature of the heat medium to weaken the cooling in the second heat exchanger. Can be brought close to the target temperature.

According to an eighth aspect of the present invention, a water circulation circuit connected to a storage tank for storing hot water and flowing hot water, and a compressor, a first heat exchanger, expansion means, and at least one evaporator are connected to generate heat. A heat pump circuit for circulating the medium, wherein the first heat exchanger heats water between the heat medium of the heat pump circuit and the water of the water circulation circuit to heat the water of the water circulation circuit, and the evaporator At least one is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water distribution circuit to cool the water of the water distribution circuit. A hot water circulation channel including a first heat exchanger and a cold water circulation channel including a storage tank and a second heat exchanger can be formed, and the heat pump circuit bypasses the second heat exchanger. Bypass channel is provided, by the second heat exchanger When replacement is not necessary, a heat medium is caused to flow through the bypass flow path, and the heat pump circuit is connected to the plurality of evaporators arranged in parallel downstream of the bypass flow path and the plurality of evaporators. The plurality of evaporators are third heat exchangers that heat the heat medium of the heat pump circuit by exchanging heat between the air from the fan and the heat medium of the heat pump circuit. The amount of heat exchange in the third heat exchanger is adjusted by switching the number of third heat exchangers through which the heat medium flows, and the temperature of the water in the water circulation circuit cooled by the second heat exchanger And a heat pump for reducing the number of third heat exchangers through which the heat medium flows, on condition that the detected temperature detected by the temperature detecting means is higher than the target temperature. With control It was characterized by comprising.

  If the detected temperature is higher than the target temperature, the heat pump system according to claim 8 determines that the temperature of the heat medium circulating in the heat pump circuit is too high, and reduces the number of third heat exchangers. Thereby, the heating amount in the 3rd heat exchanger to the heat carrier which circulates through a heat pump circuit can be decreased. And since the control range of the heating amount for the third heat exchanger is expanded to the low side, the temperature of the water cooled by the second heat exchanger is further increased by lowering the temperature of the heat medium to further enhance the cooling in the second heat exchanger. Can be brought close to the target temperature.

  The invention of claim 9 is provided with an air conditioning circuit that circulates the heat medium and supplies heat energy to the air conditioning terminal in the invention of any one of claims 1 to 8, wherein the air conditioning circuit includes an expansion tank and a heat medium. A circulation pump that circulates, and a fourth heat exchanger that exchanges heat between the heat medium of the cooling and heating circuit and the water of the water circulation circuit, and an expansion tank and a circulation pump are provided upstream of the fourth heat exchanger. It is arrange | positioned and the air conditioning terminal is connected to the downstream of the 4th heat exchanger, It was characterized by the above-mentioned.

In the heat pump system according to the ninth aspect, the heat medium of the air conditioning circuit that has exchanged heat with the fourth heat exchanger is sent to the air conditioning terminal without going through the expansion tank or the circulation pump. Therefore, heat loss in the expansion tank and the circulation pump can be prevented.
Here, the air conditioning terminal is not limited to the one having both the cooling function and the heating function, and includes one having only the heating function. For example, an air conditioner indoor unit, a floor heater, a fan convector, and the like are included in the air conditioning terminal.

  INDUSTRIAL APPLICABILITY The present invention is a heat pump system that is free from fear of freezing even in winter and has a high COP (coefficient of performance), and can provide a configuration that quickly raises the temperature during heating.

Embodiments of the present invention will be further described below.
FIG. 1 is an operation principle diagram of the heat pump system of the present invention.
The heat pump system of the present embodiment is used by making hot water and cold water using a heat pump and storing them in a tank or supplying them directly to a heat load.
The heat pump system according to the present embodiment is roughly configured by the heat pump circuit unit 1 and the heat storage unit 30.

The heat pump circuit unit 1 preferably uses carbon dioxide as a heat medium and constitutes a supercritical heat pump circuit. Further, a heat medium that changes phase, such as alternative chlorofluorocarbon, may be circulated.
Some heat pump systems switch a heating medium flow to switch between a heating cycle for extracting heat and a refrigeration cycle for extracting cold. However, the heat pump circuit unit 1 employed in the present embodiment switches the flow of the heating medium. Has no function.

As shown in FIG. 1, the heat pump circuit unit 1 includes a compressor 6, a hot water supply heat exchanger (first heat exchanger) 3, an expansion valve (expansion means) 4, and a cold water heat exchanger (second heat exchanger) 2. And a plurality of air heat exchangers (third heat exchangers) 5 arranged in parallel are connected in a ring shape. The heat pump circuit section 1 is filled with the above-described heat medium such as carbon dioxide or alternative chlorofluorocarbon, and the 14th to 16th valves are provided so that the flow path can be switched as necessary. Is provided. Here, the fourteenth to sixteenth valves are two-way valves.
The heat pump circuit unit 1 includes a compressor 6, an expansion valve 4, a blower 26, and a heat pump control unit (not shown) that controls the operation of each unit including the 14th to 16th valves.

The heat pump circuit unit 1 is provided with a bypass passage 23 that bypasses the cold water heat exchanger 2. The bypass channel 23 has one end connected to the branch 24 upstream of the cold water heat exchanger 2 and downstream of the expansion valve 4, and the other end downstream of the cold water heat exchanger 2. And connected to a branch 25 upstream of the air heat exchanger 5.
The main flow path of the heat pump circuit unit 1 is provided with a two-way valve that is a fifteenth valve downstream of the branch 24 and upstream of the chilled water heat exchanger 2, and a two-way valve that is a sixteenth valve in the bypass flow path 23. Is provided.

The compressor 6 is the same as a known one, and is a reciprocating type, rotary type, or scroll type compressor.
The hot water supply heat exchanger (first heat exchanger) 3 has a primary channel and a secondary channel. A heat medium such as carbon dioxide or alternative chlorofluorocarbon flows through the primary side flow path, and clean water flows through the secondary side flow path. In addition, a hot water supply side sensor 75 capable of detecting the temperature of the water fed into the secondary side flow path is provided in the vicinity of the inlet side of the secondary flow path of the hot water heat exchanger 3, and the secondary of the hot water heat exchanger 3 is provided. In the vicinity of the outlet side of the side channel, a hot water outlet side sensor 76 capable of detecting the temperature of the water fed from the secondary side channel is provided.
The expansion valve 4 is used for a known refrigerator or the like.

  The cold water heat exchanger (second heat exchanger) 2 functions as an evaporator together with the subsequent air heat exchanger (third heat exchanger) 5. The cold water heat exchanger 2 has a primary side flow path and a secondary side flow path. A heat medium such as carbon dioxide or alternative chlorofluorocarbon is flowed through the primary side flow path, and clean water is flowed through the secondary side flow path. Further, a chilled water inlet side sensor 77 capable of detecting the temperature of the water fed into the secondary side channel is provided in the vicinity of the inlet side of the secondary side channel of the chilled water heat exchanger 2. In the vicinity of the outlet side of the side channel, a cold water outlet side sensor 78 capable of detecting the temperature of the water fed from the secondary side channel is provided.

The air heat exchanger (third heat exchanger) 5 is included in a so-called outdoor unit. The outdoor unit includes a plurality (two in the figure) of air heat exchangers 5 arranged in parallel, a blower 26 capable of blowing air to these air heat exchangers 5, and an air heat exchange in which a heat medium flows. A two-way valve that is a fourteenth valve that adjusts the number of vessels 5 and an outside air temperature detection sensor (not shown) that detects the outside air temperature are provided.
The rotation speed of the blower 26 can be controlled within a predetermined range by the heat pump control unit.
The air heat exchanger 5 has a heat medium flow path and a blower passage, and exchanges heat between a heat medium such as carbon dioxide or alternative chlorofluorocarbon flowing through the heat medium flow path and air blown from the blower 26 flowing through the blower passage. To do.
In the heat pump circuit unit 1, the number of the air heat exchangers 5 through which the heat medium flows can be adjusted by opening and closing the fourteenth valve.

  As described above, the heat pump circuit unit 1 is filled with a heat medium such as carbon dioxide or alternative chlorofluorocarbon. Then, the heat medium is adiabatically compressed by the compressor 6 to be in a high temperature and high pressure state, flows to the downstream hot water supply heat exchanger (first heat exchanger) 3, and clean water flowing on the secondary side of the hot water supply heat exchanger 3 Reduce temperature by heat exchange. Further, the secondary side water is deprived of heat from the heat medium and rises in temperature.

  The heat medium discharged from the hot water supply heat exchanger 3 is expanded by the expansion valve 4 to be in a low temperature and low pressure state. The heat medium released from the expansion valve 4 further enters the cold water heat exchanger (second heat exchanger) 2 and vaporizes. At this time, the heat medium takes away ambient heat and raises the temperature. On the other hand, the temperature of the clean water flowing on the secondary side of the cold water heat exchanger 2 is deprived of heat and the temperature is lowered.

  The heat medium that has exited the cold water heat exchanger (second heat exchanger) 2 enters the air heat exchanger 5, is heated by the outside air sent from the blower 26, completes vaporization, and returns to the compressor 6. In the present embodiment, since the heat medium is heated by the air heat exchanger 5 and is completely vaporized, the heat medium in the gaseous state returns to the compressor 6.

Next, the heat storage unit 30 will be described.
The heat storage unit 30 is thermally connected by the heat pump circuit unit 1 described above, the hot water supply heat exchanger (first heat exchanger) 3 and the cold water heat exchanger (second heat exchanger) 2. That is, the heat medium of the heat pump circuit unit 1 flows through the primary side of the hot water supply heat exchanger 3 and the cold water heat exchanger 2, whereas the secondary side flow path communicates with the heat storage unit 30.
In addition, the heat storage unit 30 is connected to the outside by a water intake unit 56 and a hot water supply unit 52. That is, the water inlet 56 is connected to an external water source. The hot water supply unit 52 is connected to a shower, a currant, etc. (not shown).

The heat storage unit 30 is also connected to the air conditioning terminal 40. The air conditioning terminal 40 of this embodiment is specifically an indoor unit of an air conditioner, and has both a cooling function and a heating function. Of course, the indoor unit of an air conditioner is only an example, and the air conditioning terminal 40 may be a fan convector or a floor heater. A plurality of air conditioning terminals 40 connected to the heat storage unit 30 may be provided.
Furthermore, the heat storage unit 30 is also connected to an external bathtub (bath).

  Inside the heat storage unit 30, there are two hot water storage tanks 10, 11, an air conditioning / heating heat exchanger (fourth heat exchanger) 8, a bath heat exchanger (fifth heat exchanger) 9, an expansion tank 16, a first A main channel circulation pump 7, a brine circulation pump 13, and a second main channel circulation pump 14 are provided, and pipe connections are made between them so that hot water and brine can be circulated.

Further, 13 switching valves from the first valve to the 13th valve are provided so that the flow paths can be switched as necessary. Here, the first to seventh valves are two-way valves, and the eighth to thirteenth valves are three-way valves.
In addition, the heat storage unit 30 controls the operation of each of the switching valves, the first main channel circulation pump 7, the brine circulation pump 13, the second main channel circulation pump 14, the bath pump 12, and the heat pump control. A tank control unit (not shown) capable of transmitting and receiving information to and from the unit (not shown).

The two hot water storage tanks 10 and 11 employed in the present embodiment have a temperature stratification inside to store hot water or cold water. Moreover, the two hot water storage tanks 10 and 11 can selectively store both hot hot water and cold cold water.
As a characteristic structure, the two hot water storage tanks 10 and 11 have two hot water outlets on the upper side and the lower side, respectively. That is, each of the two hot water storage tanks 10 and 11 has four openings, two of which are provided in the upper part of the tank and the remaining two are provided in the lower part of the tank.
For the sake of explanation, the respective openings are referred to as upper a opening, upper b opening, lower a opening, and lower b opening.

The heat storage unit 30 takes in and circulates water from an air conditioning circuit 20 that circulates brine to supply thermal energy to the air conditioning terminal 40, a water distribution circuit 32 through which hot water flows, and a bath (bath) installed outside. The bath circulation circuit 37 is roughly divided.
These three are thermally connected, but the flow paths are completely separated. Therefore, water and brine do not mix, and the water flowing through the water distribution circuit 32 and the water in the bathtub do not mix.

  The air conditioning circuit 20 will be described sequentially. The cooling / heating circuit 20 is a flow path for circulating brine between the cooling / heating heat exchanger 8 and the external cooling / heating terminal 40, and the expansion tank 16 and the brine circulation pump 13 are interposed therebetween. In addition, as shown in the figure, the cooling / heating circuit 20 is completely independent from the heat pump circuit unit 1 described above.

The cooling / heating circuit 20 is a flow path that returns to the brine circulation pump 13 via the cooling / heating heat exchanger 8, the external cooling / heating terminal 40, and the expansion tank 16 in order, starting from the brine circulation pump 13.
Moreover, the terminal bypass flow path 46 which bypasses the external air conditioning terminal 40 as an auxiliary flow path is provided, and the terminal bypass flow path 46 is provided with a two-way valve as a third valve.
In addition, a two-way valve serving as a built-in valve (not shown) is provided in the terminal brine flow path (not shown) in which the brine circulates in the air conditioning terminal 40.

And the air conditioning circuit 20 can circulate the filled brine (antifreeze) by starting the above-mentioned brine circulation pump 13. The amount of brine flowing through the cooling / heating circuit 20 can be increased or decreased by opening / closing the third valve of the terminal bypass passage 46 and the built-in valve of the cooling / heating terminal 40, and the amount of brine reaching the cooling / heating terminal 40 can be adjusted.
Specifically, when the brine circulation pump 13 is started, the third valve of the terminal bypass passage 46 is closed, and the built-in valve of the air conditioning terminal 40 is opened, the total amount of brine flowing through the air conditioning circuit 20 is reduced to the air conditioning terminal. Pass 40.
Conversely, when the third valve of the terminal bypass passage 46 is opened and the built-in valve of the air conditioning terminal 40 is closed, the entire amount of brine flowing through the air conditioning circuit 20 bypasses the air conditioning circuit 20 and the terminal bypass passage 46 is Flowing.

Next, the water distribution circuit 32 will be described.
The water circulation circuit 32 includes two main circuits (a first main flow path 35 and a second main flow path 36), an auxiliary flow path for switching the flow direction, and the cooling flow path 21. ing. In FIG. 1, the first main flow path 35 is drawn so as to surround the outside of the second main flow path 36.

The first main flow path 35 is a flow path in which the first hot water storage tank 10 and the second hot water storage tank 11 are connected in parallel to the hot water supply heat exchanger 3. The first main channel 35 is provided with a first main channel circulation pump 7 and a check valve 15 for circulating hot water in the channel. In addition, a valve is provided in each branch flow path connecting the first main flow path 35 and each hot water storage tank 10, 11 (seventh valve, fourth valve). The seventh valve and the fourth valve are both two-way valves.
Further, a three-way valve (an eleventh valve) for connecting to a second main flow path 36 to be described later is provided.
Further, the first main flow path 35 is provided with a water inlet 56 and a hot water supply part 52.

  More specifically, the first main flow path 35 includes a hot water supply / exhaust flow path 48 disposed on the outlet side (upper side in the drawing) of the secondary flow path of the hot water supply heat exchanger 3 and hot water supply heat exchange. And a hot water supply heat inlet side channel 53 disposed on the inlet side (lower side in the drawing) of the secondary side channel of the vessel 3. In the figure, the upper side of the hot water supply heat exchanger 3 is a water outlet, and the lower side of the hot water heat exchanger 3 is a water inlet.

In the hot water supply heat exchange side channel 48, a three-way valve as an eleventh valve and two branches 81 and 82 are provided in order from the hot water supply heat exchanger 3 side.
The three-way valve that is the eleventh valve has a G port, a J port, and an H port as shown in the figure, and the main port of the hot water supply heat exchange side channel 48 is connected to the G port and the J port, A first communication path 50 reaching the second main flow path 36 is connected to the H port.

Branch flow paths 83 and 84 are connected to the two branches 81 and 82 of the hot water supply heat exchange side flow path 48, respectively. The branch flow passages 83 and 84 extend from the branches 81 and 82 of the hot water supply heat exchange side flow passage 48 to the upper b opening that is the upper opening of the first and second hot water storage tanks 10 and 11. That is, the hot water supply heat exchange side flow channel 48 is branched from the main flow channel and connected to the first and second hot water storage tanks 10 and 11. A two-way valve, which is a seventh valve, is attached to the branch passage 83 leading to the first hot water storage tank 10, and a two-way valve, which is a fourth valve, is attached to the branch passage 84 leading to the second hot water storage tank 11. .
In addition, a bypass passage 57 (described later) is connected to the end portion 85 of the hot water supply / heat exchange channel 48.

On the other hand, in the hot water supply heat inlet side channel 53, the check valve 15, the first main channel circulation pump 7, the four branches 86 to 89, the pressure reducing valve 92, and the tap water are sequentially arranged from the hot water supply heat exchanger 3 side. A water inlet 56 to which a water supply source is connected is provided.
To the four branches 86 to 89, a second communication path 54, branch paths 90 and 91, and a bypass path 57, which will be described later, are connected in order from the hot water supply heat exchanger 3 side.

  The branch flow passages 90 and 91 extend from the branches 87 and 88 of the hot water supply heat inlet side flow passage 53 to the lower b opening that is the lower opening of the first and second hot water storage tanks 10 and 11. That is, the hot water supply heat inlet side flow channel 53 is branched from the main flow channel and connected to the first and second hot water storage tanks 10 and 11.

The bypass passage 57 mixes the hot water flowing from the hot water flowing through the hot water supply heat exchange side channel 48 with the normal temperature water supplied from the water inlet 56 into the hot water heater 52 or the bath circulation circuit 37. Supply.
As shown in the figure, the bypass passage 57 is arranged so as to connect the end portion 85 of the hot water supply / heat supply side flow path 48 and the branch 89 of the hot water supply / heat supply side flow path 53, and includes a check valve, a two-way valve, The piping is configured by using a three-way valve or the like as the hot and cold mixing valve 58.

  When the first main channel circulation pump 7 provided in the first main channel 35 is activated, a water flow is generated in the first main channel 35. And hot water (including cold water) can be taken in and out of the hot water storage tanks 10 and 11 by opening and closing each valve.

  Specifically, when the seventh valve provided in the upper part of the first hot water storage tank 10 of the first main flow path 35 is opened, an annular flow path constituted by the hot water supply heat exchanger 3 and the first hot water storage tank 10 is opened. The hot water that has passed through the hot water supply heat exchanger 3 enters the first hot water storage tank 10 through the upper b opening at the top of the first hot water storage tank 10. And the hot water in the 1st hot water storage tank 10 is extruded from the lower b opening provided in the lower part of the 1st hot water storage tank 10, and returns to the hot water supply heat exchanger 3 through the 1st main flow path circulation pump 7.

  When the fourth valve provided in the upper part of the second hot water storage tank 11 of the first main flow path 35 is opened, an annular flow path constituted by the hot water supply heat exchanger 3 and the second hot water storage tank 11 is opened, and hot water supply heat exchange is performed. Hot water that has passed through the vessel 3 enters the second hot water storage tank 11 through the upper b opening at the top of the second hot water storage tank 11. And the hot water in the 2nd hot water storage tank 11 is extruded from the lower b opening provided in the lower part of the 2nd hot water storage tank 11, and returns to the hot water supply heat exchanger 3 through the 1st main flow path circulation pump 7. FIG.

  In addition, when the G port and the H port of the three-way valve as the eleventh valve are communicated, the hot water supply heat exchanger 3 and the cooling / heating heat exchanger 8 can be communicated.

Next, the second main flow path 36 will be described.
The second main flow path 36 is a flow path in which the bath heat exchanger 9, the first hot water storage tank 10, and the second hot water storage tank 11 are connected in parallel to the cooling / heating heat exchanger 8. The second main channel 36 is provided with a second main channel circulation pump 14 for circulating hot water in the channel. Four three-way valves and two two-way valves are provided.

  More specifically, the second main channel 36 includes an air conditioning / heating heat input side channel 61 disposed on the inlet side of the secondary side channel of the cooling / heating heat exchanger 8 and a secondary of the cooling / heating heat exchanger 8. A heating / cooling heat exchange side channel 62 disposed on the outlet side of the side channel and a branch channel 70 including the bath heat exchanger 9 are provided. In the figure, the upper side of the cooling / heating heat exchanger 8 is a water inlet, and the lower side of the cooling / heating heat exchanger 8 is an outlet side.

  The air conditioning / heating heat input side flow path 61 is provided with a two-way valve as a fifth valve, a three-way valve as a twelfth valve, and a three-way valve as an eighth valve in order from the air conditioning / heat exchanger 8 side.

The three-way valve, which is the twelfth valve, has a K port, an L port, and an M port as shown in the figure, and the main flow path of the heating / cooling heat input side flow path 61 is connected to the K port and the M port, One end of the first transition pipe 65 is connected to the L port.
The other end of the first transition pipe 65 is connected between the thirteenth valve and the ninth valve of the cooling / heating heat exchange side passage 62.

  The three-way valve, which is the eighth valve, has an A port, a B port, and a C port, as shown in the figure. The main port of the heating / cooling heat input side channel 61 is connected to the A port, and the B port is connected to the B port. A branch flow path leading to the upper a opening that is the upper opening of the first hot water storage tank 10 is connected, and a branch flow path reaching the upper a opening that is the upper opening of the second hot water storage tank 11 is connected to the C port. That is, in the air conditioning / heating heat input side channel 61, the main channel is bifurcated by the eighth valve, one branched end is connected to the first hot water storage tank 10, and the other end is the second hot water storage tank 11. It is connected to the.

A branch is formed between the cooling / heating heat exchanger 8 and the fifth valve in the heating / cooling heat input side channel 61. And the 1st communicating path 50 is provided so that this branch and the H port of the three-way valve (11th valve) provided in the hot water supply heat exchange side flow path 48 of the 1st main flow path 35 may be connected.
The first communication path 50 is a flow path that communicates the hot water supply / heat exchange side flow path 48 of the first main flow path 35 and the cooling / heating / heat exchange side flow path 61 of the second main flow path 36.

  On the other hand, in the cooling / heating heat exchange side flow path 62, the second main flow path circulation pump 14, the two-way valve as the first valve, the three-way valve as the thirteenth valve, and the ninth valve are sequentially arranged from the cooling / heating heat exchanger 8 side. A three-way valve is provided.

The three-way valve as the thirteenth valve has an O port, a P port, and a Q port as shown in the figure, and the O port and the Q port are connected to the main flow path of the heating / cooling heat exchange side flow path 62, and P One end of the second crossover pipe 66 is connected to the port.
The other end of the second transition pipe 66 is connected between the twelfth valve and the eighth valve of the air conditioning / heating heat input side flow passage 61.

  The three-way valve, which is the ninth valve, has a D port, an E port, and an F port as shown in the figure. The main port of the heating / cooling heat exchange side channel 62 is connected to the D port, and the E port is connected to the E port. A branch flow path leading to the lower a opening which is the lower opening of the first hot water storage tank 10 is connected, and a branch flow path reaching the lower a opening which is the lower opening of the second hot water storage tank 11 is connected to the F port. In other words, the air-conditioning heat exchange side flow path 62 has a main flow path bifurcated by the ninth valve, one branched end is connected to the first hot water storage tank 10, and the other end is the second hot water storage tank 11. It is connected to the.

A branch is formed between the first valve and the thirteenth valve of the air-conditioning heat exchange side flow path 62. And the 2nd communicating path 54 is arrange | positioned so that this branch and the branch 86 formed between the 1st hot water storage tank 10 and the 1st main flow path circulation pump 7 of the hot water supply heat inflow side flow path 53 may be connected. .
The second communication passage 54 is a flow passage that communicates the hot water supply / heat-exchange-side flow passage 53 of the first main flow passage 35 and the cooling / heating / heat-exchange-side flow passage 62 of the second main flow passage 36. A three-way valve that is a tenth valve is attached to the second communication passage 54.

  The three-way valve, which is the tenth valve, has an R port, S port, and T port as shown in the figure. The main flow path of the second communication passage 54 is connected to the R port and T port, and the S port is connected to the S port. Is connected to one end of the third communication passage 55 which reaches the hot water supply / heat exchange side passage 48. Note that the other end of the third communication passage 55 is connected between the hot water supply heat exchanger 3 and the eleventh valve of the hot water supply heat exchange side passage 48. Therefore, a part of the second communication path 54 and the third communication path 55 allow the hot water supply / heat supply side flow path 48 and the hot water supply / heat supply side flow path 53 of the first main flow path 35 to communicate with each other.

  One end of the branch flow path 70 including the bath heat exchanger 9 is connected between the fifth valve and the twelfth valve of the cooling / heating heat input side flow path 61, and the other end is connected to the cooling / heating heat exchange. It is connected between the cooling / heating heat exchanger 8 in the side passage 62 and the second main passage circulation pump 14. The branch flow path 70 is provided with a two-way valve as a sixth valve.

  When the second main channel circulation pump 14 provided in the second main channel 36 is activated, a water flow is generated in the second main channel 36. By opening and closing each valve, hot water (including cold water) in the hot water storage tanks 10 and 11 can be taken in and out.

  For example, the M port and K port of the twelfth valve are in communication, the O port and Q port of the thirteenth valve are in communication, the A port and B port of the eighth valve are in communication, and the ninth valve By making the D port and the E port in communication with each other, an annular flow path constituted by the cooling / heating heat exchanger 8 and the first hot water storage tank 10 can be opened to the second main flow path 36. In this annular flow path, the hot water that has passed through the cooling / heating heat exchanger 8 enters the first hot water storage tank 10 through the lower a opening at the bottom of the first hot water storage tank 10. And the hot water in the 1st hot water storage tank 10 is extruded from the upper a opening provided in the upper part of the 1st hot water storage tank 10, and it returns to the air conditioning heat exchanger 8. FIG.

  In the above state, the eighth valve and the ninth valve are switched, the A port and the C port of the eighth valve are brought into a communication state, and the D port and the F port of the ninth valve are brought into a communication state. An annular flow path constituted by the heat exchanger 8 and the second hot water storage tank 11 can be opened to the second main flow path 36. In this annular flow path, the hot water that has passed through the cooling / heating heat exchanger 8 enters the second hot water storage tank 11 through the lower a opening at the bottom of the second hot water storage tank 11. And the hot water in the 2nd hot water storage tank 11 is extruded from the upper a opening provided in the upper part of the 2nd hot water storage tank 11, and it returns to the air conditioning heat exchanger 8.

  When the two-way valve, which is the fifth valve, and the two-way valve, which is the sixth valve, are opened, the cooling / heating heat exchanger 8 and the bath heat exchanger 9 are connected in parallel to the second main channel circulation pump 14, so that the heating / cooling heat exchange is performed. Hot water flows through both the vessel 8 and the bath heat exchanger 9.

  In addition, by switching the 12th valve and the 13th valve, the K port and the L port of the 12-way three-way valve are in communication, and the O port and the P port of the 13th valve are in communication. The direction of entering and exiting the hot water storage tanks 10 and 11 can be reversed.

  More specifically, as a normal route, the K port and M port of the twelfth valve are in communication with each other, the O port and Q port of the thirteenth valve are in communication (normal state), and the second main flow path is set. When the circulation pump 14 is operated, as described above, the hot water that has passed through the heating / cooling heat exchanger 8 passes through the lower a openings at the lower portions of the first and second hot water storage tanks 10, 11 and then the first and second hot water storage tanks 10, 11. The hot water in the first and second hot water storage tanks 10 and 11 is pushed out from the upper a opening provided in the upper part of the first and second hot water storage tanks 10 and 11, and returns to the cooling / heating heat exchanger 8.

  On the other hand, the K port and the L port of the twelfth valve are in communication with each other, the K port and the M port are disconnected, and the O port and P port of the thirteenth valve are in communication with each other. And the Q port are disconnected from each other, the place where the hot water storage tanks 10 and 11 are put into and out of the hot water storage tanks 10 and 11 is replaced, and hot water enters from the upper side of the hot water storage tanks 10 and 11 and flows out from the lower side.

That is, the hot water discharged from the second main flow path circulation pump 14 through the cooling / heating heat exchanger 8 passes through a part of the cooling / heating heat input side flow path 61 through the second transition pipe 66, and the first, The first and second hot water storage tanks 10 and 11 are entered from the upper upper opening of the second hot water storage tanks 10 and 11.
And the hot water in the 1st, 2nd hot water storage tanks 10 and 11 is extruded from the lower a opening provided in the lower part of the 1st and 2nd hot water storage tanks 10 and 11, and passes through the 1st crossover piping 65, and air-conditioning heat input. It is returned to the cooling / heating heat exchanger 8 via a part of the side flow path 61.

Next, the cooling channel 21 will be described.
The cooling channel 21 is arranged on the inlet side channel 72 arranged on the inlet side of the secondary side channel of the cold water heat exchanger 2 and on the outlet side of the secondary side channel of the cold water heat exchanger 2. The inlet passage 72 is provided with a two-way valve as a second valve. In the cooling channel 21, hot water sent from the cooling / heating heat exchange side channel 62 to the chilled water heat exchanger 2 is flowed to the inlet side channel 72, and from the chilled water heat exchanger 2 to the outlet side channel 73. Hot water returned to the air-conditioning heat exchange side flow path 62 is flowed.

One end of the inlet-side channel 72 is connected between the second main channel circulation pump 14 and the first valve of the cooling / heating heat exchange-side channel 62 (second main channel 36), and the other end. Is connected to the end of the inlet side of the secondary flow path of the cold water heat exchanger 2.
In addition, one end of the outlet side flow path 73 is connected between the first valve and the branch to which the second communication path 54 of the cooling / heating heat exchange side flow path 62 (second main flow path 36) is connected. The other end is connected to the exit end of the secondary flow path of the cold water heat exchanger 2.

And if the 1st valve of the air conditioning heat exchange side flow path 62 (2nd main flow path 36) is closed and the 2nd valve of the entrance side flow path 72 of the cooling flow path 21 is opened, the hot water which flows through the 2nd main flow path 36 will be shown. The whole amount passes through the cold water heat exchanger 2.
Conversely, when the first valve is opened and the second valve is closed, the entire amount of hot water flowing through the second main flow path 36 bypasses the cold water heat exchanger 2.
Further, when both the first valve and the second valve are opened, a part of hot water flowing through the second main flow path 36 flows into the cold water heat exchanger 2.

Next, the bath circulation circuit 37 will be described.
The bath circulation circuit 37 is composed of an outward flow path for sending hot water from the bath heat exchanger 9 to the bathtub and a return flow path for returning hot water from the bathtub to the bath heat exchanger 9. A bath pump 12 is provided on the side facing the heat exchanger 9.
For this reason, the bath circulation circuit 37 can start the bath pump 12 and circulate hot water from an external bathtub (bath) to the bath heat exchanger 9 to recharge the bath and recover remaining thermal energy.

  In addition, the heat pump system of this embodiment is the liquid flow of the primary side flow path in the cold water heat exchanger 2, the hot water supply heat exchanger 3, the air-conditioning heat exchanger 8, and the bath heat exchanger 9, and the liquid of the secondary side flow path. This is a configuration that is advantageous for heat transfer.

Next, the operation mode of the heat pump system of this embodiment will be described.
The heat pump system of the present embodiment includes a cooling mode using a hot water storage tank, a direct cooling mode, a cold / hot water storage mode, a tank heating mode using a hot water storage tank (heating only mode), a direct heating mode, a hot water storage mode, and bath heat recovery. It can be operated in each mode of a mode, a hot water mode, a stagnant water replacement boiling mode, a freeze prevention mode, a defrost mode by bath heat recovery, a tank heating and a hot water storage simultaneous mode (heating and hot water storage combined mode).
This will be sequentially described below.

(Cooling mode using hot water storage tank)
In the cooling mode using the hot water storage tank, cooling is performed using the cold water stored in the hot water storage tank.
FIG. 2 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of valves and the flow of hot water in a cooling mode using a hot water storage tank.
In this embodiment, although the example which cools with the air-conditioning terminal 40 using the cold water stored in the 1st hot water storage tank 10 is shown, the cold water stored in the 2nd hot water storage tank 11 may be used.

  In the cooling mode using the hot water storage tank, the cooling / heating circuit 20 and the water circulation circuit 32 are used. Further, since the heat pump circuit unit 1 is not used, the compressor 6 is stopped.

  In the cooling / heating circuit 20, a flow path returning to the cooling / heating heat exchanger 8 via the cooling / heating heat exchanger 8, the external cooling / heating terminal 40, the expansion tank 16, and the brine circulation pump 13 is opened. Then, brine is circulated by the brine circulation pump 13. At this time, the third valve is in a closed state, and the terminal bypass channel 46 is closed.

In the water circulation circuit 32, the first main channel 35 and the second main channel 36 are made independent (edge cutting), and only the second main channel 36 is used. Further, the twelfth valve and the thirteenth valve are switched so that water can be passed through the first transition pipe 65 and the second transition pipe 66.
Specifically, the K port and L port of the 12-way three-way valve are made to communicate with each other, the O port and P port of the 13-way three-way valve are made to communicate, and the air conditioning heat exchanger 8, Heat exchange through the main channel circulation pump 14, the 13th valve, the second transition pipe 66, the upper a opening of the first hot water storage tank 10, the lower a opening of the first hot water storage tank 10, the second transition pipe 65, and the twelfth valve. The flow path back to the vessel 8 is opened.
And the 2nd main channel circulation pump 14 is started, and hot water is circulated through the above-mentioned channel.

  The open / close state of each valve and the activated state of each pump in the cooling mode using the hot water storage tank are as shown in Table 1 below.

In the cooling mode using the hot water storage tank, the cold water accumulated on the lower side of the first hot water storage tank 10 passes through the lower a opening of the first hot water storage tank 10, the second transition pipe 65, and the twelfth valve to the cooling / heating heat exchanger 8. It reaches. And it heat-exchanges with the brine which flows through the air conditioning circuit 20 with the air conditioning heat exchanger 8, and cools a brine.
The brine whose temperature has been lowered due to cooling by the cooling / heating heat exchanger 8 reaches the external cooling / heating terminal 40 and contributes to cooling. The brine that has exited the air conditioning terminal 40 returns to the air conditioning and heat exchanger 8 via the expansion tank 16 and the brine circulation pump 13.

(Direct cooling mode)
The direct cooling mode is a mode in which the heat pump circuit is operated to generate a low temperature, and this cooling heat is moved to the cooling / heating terminal 40 and cooled without being stored. In this operation mode, hot water is stored in the second hot water storage tank 11 at the same time.
FIG. 3 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the direct cooling mode.

In the direct cooling mode, the heat pump circuit unit 1, the cooling / heating circuit 20, and the water circulation circuit 32 are used.
In the heat pump circuit unit 1, the compressor 6 is activated to circulate the heat medium in the heat pump circuit. At this time, the heat pump circuit unit 1 is configured such that the fifteenth valve is in the open state and the sixteenth valve is in the closed state, and the heat medium flows to the cold water heat exchanger 2 instead of the bypass flow path 23.
In the drawing, the number of the air heat exchangers 5 in which the fourteenth valve is closed and the heat medium flows is one, but the fourteenth valve is not limited to such a configuration. The open / close state of the fourteenth valve is determined according to the heating amount of the heat medium in the cold water heat exchanger 2 together with the rotational speed of the blower 26. Note that these controls will be described in detail later using a flowchart.
As a result, in the heat pump circuit unit 1, the heat medium flow path side of the hot water supply heat exchanger (first heat exchanger) 3 becomes high temperature, and the heat medium flow path side of the cold water heat exchanger (second heat exchanger) 2 becomes low temperature. .

  In the cooling / heating circuit 20, a flow path returning to the cooling / heating heat exchanger 8 via the cooling / heating heat exchanger 8, the external cooling / heating terminal 40, the expansion tank 16, and the brine circulation pump 13 is opened. Then, brine is circulated by the brine circulation pump 13.

In the water circulation circuit 32, the first main channel 35 and the second main channel 36 are made independent (edge cutting).
The 1st main flow path 35 opens the annular flow path which connects the hot water supply heat exchanger 3 and the 2nd hot water storage tank 11, and closes another flow path. A specific annular flow path passes from the hot water supply heat exchanger 3 through the upper b opening of the second hot water storage tank 11, the lower b opening of the second hot water storage tank 11, the first main flow path circulation pump 7, and the check valve 15. The flow path returns to the hot water supply heat exchanger 3.
And the 1st main flow path circulation pump 7 is started, and hot water is circulated through the above-mentioned flow path.

The 2nd main flow path 36 opens the annular flow path which connects the cold-water heat exchanger 2 and the air conditioning heat exchanger 8, and closes another flow path. A specific annular flow path is a flow path that returns from the chilled water heat exchanger 2 to the chilled water heat exchanger 2 via the first transition pipe 65, the cooling / heating heat exchanger 8, and the second main flow path circulation pump 14.
And the 2nd main channel circulation pump 14 is started, and hot water is circulated through the above-mentioned channel.

  The open / close state of each valve and the activation state of each pump in the direct cooling mode are as shown in Table 2 below.

In the direct cooling mode, a high temperature is created by the hot water supply heat exchanger 3 and a low temperature is created by the cold water heat exchanger 2.
As described above, in the first main flow path 35, an annular flow path connecting the hot water supply heat exchanger 3 and the second hot water storage tank 11 is opened. The hot water in the flow path is circulated and moved by the first main flow path circulation pump 7, and the hot water passing through the hot water supply heat exchanger 3 is supplied to the upper side of the second hot water storage tank 11.
In the second hot water storage tank 11, hot hot water is stored in layers from the second hot water storage tank 11. That is, in the second hot water storage tank 11, there is a clear boundary between the hot water supplied newly and the low temperature hot water remaining in the tank, and the two do not mix together. Thermal stratification is formed inside.
The low temperature hot water is pushed out from the bottom of the second hot water storage tank 11 and returns to the hot water supply heat exchanger 3.
This circulation is repeated, and the second hot water storage tank 11 is gradually filled with hot water.

  In the second main flow path 36, an annular flow path connecting the cold water heat exchanger 2 and the cooling / heating heat exchanger 8 is opened. Hot water in the flow path is circulated and moved by the second main flow path circulation pump 14, and the cold water cooled by the cold water heat exchanger 2 is supplied to the cooling / heating heat exchanger 8. In the cooling / heating heat exchanger 8, the brine is cooled by the supplied cold water. The cooled brine reaches the external air conditioning terminal 40 and contributes to cooling.

(Cold / hot water storage mode)
The cold / hot water storage mode is a mode in which the heat pump circuit unit 1 is operated to generate hot water and cold water, and each is stored in a hot water storage tank. In preparation for the cooling operation, cold water can be stored during a time period when the cooling operation is not performed, which is suitable for an operation in the midnight power band.
FIG. 4 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the cold / hot water storage mode. In the present embodiment, cold water is stored in the first hot water storage tank 10, and hot water is stored in the second hot water storage tank 11.

In the cold / hot water storage mode, the heat pump circuit unit 1 and the water circulation circuit 32 are used among the above-described flow paths.
The heat pump circuit unit 1 has the same flow path configuration as that in the direct cooling mode.

In the water circulation circuit 32, the first main channel 35 and the second main channel 36 are made independent (edge cutting).
The first main channel 35 is the same as the channel configuration in the direct cooling mode described above, and hot water is circulated by the first main channel circulation pump 7.

The second main flow path 36 opens an annular flow path connecting the cold water heat exchanger 2 and the first hot water storage tank 10 and closes the other flow paths. The specific annular flow path passes from the cold water heat exchanger 2 via the lower a opening of the first hot water storage tank 10, the upper upper opening of the first hot water storage tank 10, the cooling / heating heat exchanger 8, and the second main flow path circulation pump 14. The flow path returns to the cold water heat exchanger 2.
And the 2nd main channel circulation pump 14 is started, and hot water is circulated through the above-mentioned channel.

  The open / close state of each valve and the activated state of each pump in the cold / hot water storage mode are as shown in Table 3 below.

In the cold / hot water storage mode, a high temperature is produced by the hot water supply heat exchanger 3 and a low temperature is produced by the cold water heat exchanger 2.
As described above, in the first main flow path 35, an annular flow path connecting the hot water supply heat exchanger 3 and the second hot water storage tank 11 is opened. Hot water in the flow path is circulated and moved by the first main flow path circulation pump 7, hot water passing through the hot water supply heat exchanger 3 is supplied to the upper side of the second hot water storage tank 11, and hot hot water is supplied to the second hot water storage tank. 11 is stored in layers from above.
The low temperature hot water is pushed out from the bottom of the second hot water storage tank 11 and returns to the hot water supply heat exchanger 3.
This circulation is repeated, and the second hot water storage tank 11 is gradually filled with hot water.

In the second main flow path 36, an annular flow path connecting the cold water heat exchanger 2 and the first hot water storage tank 10 is opened. Hot water in the flow path is circulated and moved by the second main flow path circulation pump 14, and cold water cooled by the cold water heat exchanger 2 is supplied to the lower side of the first hot water storage tank 10.
In the first hot water storage tank 10, cold water is stored in layers from below the first hot water storage tank 10. That is, in the first hot water storage tank 10, there is a clear boundary between the newly supplied cold water and the normal temperature hot water remaining in the tank, and the two do not mix, and the temperature in the first hot water storage tank 10 is high. Stratification is configured.
The room temperature hot water is pushed out from the upper part of the first hot water storage tank 10 and returns to the cold water heat exchanger 2.
This circulation is repeated, and the first hot water storage tank 10 is gradually filled with low-temperature water.

  In the above-described embodiment, cold water is stored in the first hot water storage tank 10 and hot water is stored in the second hot water storage tank 11. Conversely, hot water is stored in the first hot water storage tank 10, and cold water is stored in the second hot water storage tank 11. You may store.

(Tank heating mode using a hot water storage tank (heating only mode))
The tank heating mode using the first hot water storage tank 10 performs heating using the hot water stored in the first hot water storage tank 10.
FIG. 5 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of valves and the flow of hot water in the tank heating mode using the first hot water storage tank 10.

In the tank heating mode using the first hot water storage tank 10, the cooling / heating circuit 20 and the water circulation circuit 32 are used.
Since the heat pump circuit unit 1 is not used, the compressor 6 is stopped.

  The flow path configuration of the cooling / heating circuit 20 is the same as that in the cooling mode using the hot water storage tank, and the third valve is closed and the terminal bypass flow path 46 is closed.

In the water circulation circuit 32, the first main channel 35 and the second main channel 36 are made independent (edge cutting), and only the second main channel 36 is used.
The 2nd main flow path 36 opens the annular flow path which connects the air conditioning heat exchanger 8 and the 1st hot water storage tank 10, and closes another flow path. The specific annular flow path includes the air conditioning heat exchanger 8 from the air conditioning / heating heat exchanger 8 through the second main flow path circulation pump 14, the lower a opening of the first hot water storage tank 10, and the upper opening of the first hot water storage tank 10. It is a flow path which returns to.
And the 2nd main flow path circulation pump 14 is started, and hot water is circulated through the above-mentioned flow path.

  The open / close state of each valve and the activated state of each pump in the tank heating mode using the first hot water storage tank are as shown in Table 4 below.

In the tank heating mode using the first hot water storage tank, the hot water accumulated on the upper side of the first hot water storage tank 10 is discharged from the upper a opening of the first hot water storage tank 10 and reaches the cooling / heating heat exchanger 8. Then, heat is exchanged with the brine flowing through the cooling / heating circuit 20 in the cooling / heating heat exchanger 8 to raise the temperature of the brine.
The brine whose temperature has been increased by receiving heat from the air conditioning / heating heat exchanger 8 reaches the external air conditioning / heating terminal 40 and contributes to heating. The brine that has exited the air conditioning terminal 40 returns to the air conditioning and heat exchanger 8 via the expansion tank 16 and the brine circulation pump 13.

The above is a case where heating is performed using the first hot water storage tank 10, but a tank heating mode using the second hot water storage tank 11 is also possible.
FIG. 6 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valves and the flow of hot water in the tank heating mode using the second hot water storage tank.
Whereas the tank heating mode using the first hot water storage tank 10 described above has opened an annular flow path connecting the cooling / heating heat exchanger 8 and the first hot water storage tank 10, the tank heating mode using the second hot water storage tank 11 is The only difference is that the annular flow path connecting the cooling / heating heat exchanger 8 and the second hot water storage tank 11 is opened, and the others are the same.
The open / close state of each valve and the activated state of each pump in the tank heating mode using the second hot water storage tank 11 are as shown in Table 5 below.

  In the tank heating mode using the hot water storage tank, high temperature hot water stored in the hot water storage tanks 10 and 11 is taken out and used for heating. Therefore, compared with the “direct heating mode” described below, The temperature rises quickly.

(Direct heating mode)
The direct heating mode is a mode in which a heat pump circuit is operated to generate a high temperature, and this heat is moved to the cooling / heating terminal 40 for heating without being stored. The direct heating mode is a heating mode suitable for a case where there is little remaining hot water in the hot water storage tanks 10 and 11 because heating can be performed without consuming hot water in the hot water storage tanks 10 and 11. Further, according to the direct heating mode, hot water can be left in the hot water storage tanks 10 and 11 for the purpose of dropping a bath or supplying hot water.
FIG. 7 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the direct heating mode.

In the direct heating mode, the heat pump circuit unit 1, the cooling / heating circuit 20, and the water circulation circuit 32 are used.
In the heat pump circuit unit 1, the compressor 6 is activated to distribute the heat medium to the heat pump circuit. At this time, the heat pump circuit unit 1 is configured such that the fifteenth valve is in the closed state and the sixteenth valve is in the open state, and the heat medium bypasses the cold water heat exchanger 2. Moreover, the 14th valve is an open state, and the number of the air heat exchangers 5 through which the heat medium flows is two. As a result, the heat medium flow path side of the hot water supply heat exchanger (first heat exchanger) 3 becomes high temperature, whereas the heat medium flow path side of the cold water heat exchanger (second heat exchanger) 2 does not become low temperature. Further, the heating amount of the heat medium that is reduced by bypassing the cold water heat exchanger 2 by the heat medium is adjusted by increasing the number of air heat exchangers 5 and controlling the rotational speed of the blower 26.

  The flow path configuration of the cooling / heating circuit 20 is the same as that in the cooling mode using the hot water storage tank, and the third valve is closed and the terminal bypass flow path 46 is closed.

The water circulation circuit 32 communicates the first main flow path 35 and the second main flow path 36 via the first communication path 50 and the second communication path 54 to connect the hot water supply heat exchanger 3 and the cooling / heating heat exchanger 8. Open the connecting annular channel and close the other channels.
Specifically, the G port and the H port of the three-way valve as the eleventh valve are communicated, and the hot water supply heat exchanger 3 and the cooling / heating heat exchanger 8 are communicated via the first communication path 50. Further, the T-port and the R-port of the three-way valve that is the tenth valve are communicated to open the second communication passage 54, and the discharge side of the cooling / heating heat exchanger 8 and the hot water supply heat exchanger 3 are communicated.
As a result, from the hot water supply heat exchanger 3, the eleventh valve, the first communication passage 50, the cooling / heating heat exchanger 8, the second main channel circulation pump 14, the first valve, the second communication passage 54, the tenth valve, the first valve An annular flow path returning to the hot water supply heat exchanger 3 via the main flow path circulation pump 7 and the check valve 15 is opened.
And the 1st main channel circulation pump 7 and the 2nd main channel circulation pump 14 are started, and hot water is circulated through the above-mentioned channel.

  The open / close state of each valve and the activated state of each pump in the direct heating mode are shown in Table 6 below.

In the direct heating mode, a high temperature is created in the hot water supply heat exchanger 3, an annular flow path connecting the hot water supply heat exchanger 3 and the cooling / heating heat exchanger 8 is opened, and the first main flow path circulation pump 7 and the second main flow path circulation are opened. Since the hot water in the flow path is circulated by the pump 14, the hot water passing through the hot water supply heat exchanger 3 is conveyed to the cooling / heating heat exchanger 8 and exchanges heat with the brine of the cooling / heating circuit 20.
The brine that has been heated by the heating / cooling heat exchanger 8 reaches the external cooling / heating terminal 40 and contributes to heating. The brine that has exited the air conditioning terminal 40 returns to the air conditioning and heat exchanger 8 via the expansion tank 16 and the brine circulation pump 13.

(Hot water storage mode)
The hot water storage mode is a mode in which the heat pump circuit is operated to generate hot water and stored in both the first hot water storage tank and the second hot water storage tank.
FIGS. 8 and 9 are operation principle diagrams in the hot water storage mode of the heat pump system of the present invention, and FIG. 8 shows the open / close state of the valve and the flow of hot water when hot water is stored in the second hot water storage tank, FIG. 9 shows the open / close state of the valve and the flow of hot water when warm water is stored in the first hot water storage tank.

In the hot water storage mode, the heat pump circuit unit 1 and the water circulation circuit 32 are used.
The heat pump circuit unit 1 has the same flow path configuration as that of the direct heating mode.

In the water circulation circuit 32, the first main channel 35 and the second main channel 36 are made independent (edge cutting), and only the first main channel 35 is used. That is, the second main channel circulation pump 14 of the second main channel 36 is stopped.
The 1st main flow path 35 opens the annular flow path which connects the hot water supply heat exchanger 3 and the 2nd hot water storage tank 11 similarly to the above-mentioned cold / hot water storage mode, and closes another flow path. And the 1st main flow path circulation pump 7 is started, and hot water is circulated through the said flow path.

  The open / close state of each valve and the activated state of each pump when warm water is stored in the second hot water storage tank in the warm water storage mode are as shown in Table 7 below.

In the hot water storage mode, a high temperature is generated by the hot water supply heat exchanger 3.
As described above, the first main channel 35 opens the annular channel connecting the hot water heat exchanger 3 and the second hot water storage tank 11, and the hot water in the channel is circulated and moved by the first main channel circulation pump 7. The hot water passing through the hot water supply heat exchanger 3 is supplied to the upper side of the second hot water storage tank 11 by the first main flow path circulation pump 7, and hot hot water is stored in layers from above the second hot water storage tank 11.
The low temperature hot water is pushed out from the bottom of the second hot water storage tank 11 and returns to the hot water supply heat exchanger 3.
This circulation is repeated, and the second hot water storage tank 11 is gradually filled with hot water.

When the inside of the second hot water storage tank 11 is filled with hot water, the hot water storage tank for storing hot water is switched from the second hot water storage tank 11 to the first hot water storage tank 10, and hot water is supplied to the first hot water storage tank 10.
That is, as shown in FIG. 9, the first main flow path 35 opens an annular flow path connecting the hot water supply heat exchanger 3 and the first hot water storage tank 10 and closes the other flow paths.
And the 1st main flow path circulation pump 7 is started, and hot water is circulated through the above-mentioned flow path.

  Table 8 below shows the open / closed state of each valve and the activated state of each pump when warm water is stored in the first hot water storage tank 10 in the warm water storage mode.

(Bath heat recovery mode)
In the bath heat recovery mode, the bath heat circuit 9 is used to circulate hot water from an external bathtub in the bath heat exchanger 9 to recover thermal energy contained in the remaining hot water in the bath.
FIGS. 10 and 11 are operation principle diagrams of the heat pump system of the present invention. FIG. 10 shows the open / close state of the valve and the flow of hot water in the bath heat recovery mode using the first hot water storage tank 10, and FIG. The open / close state of the valve and the flow of hot water in the bath heat recovery mode using a hot water storage tank are shown.
In the bath heat recovery mode, the water circulation circuit 32 and the bath circulation circuit 37 are used.

The water circulation circuit 32 makes the first main channel 35 and the second main channel 36 independent (edge cutting), and uses only the second main channel 36. Further, the twelfth valve and the thirteenth valve are switched so that water can be passed through the first transition pipe 65 and the second transition pipe 66.
Specifically, the K port and L port of the 12-way three-way valve are communicated, and the O port and P port of the 13-way three-way valve are communicated. Further, the flow path leading to the cooling / heating heat exchanger 8 is closed by closing the fifth valve, and the flow path leading to the bath heat exchanger 9 is opened instead by opening the sixth valve.

Accordingly, in order from the bath heat exchanger 9, the sixth valve, the second main flow path circulation pump 14, the thirteenth valve, the second transition pipe 66, the eighth valve, the upper a opening of the first hot water storage tank 10, the first hot water storage tank An annular flow path that returns to the bath heat exchanger 9 through the lower 10 a opening, the ninth valve, the first transition pipe 65, and the twelfth valve is opened.
And the 2nd main flow path circulation pump 14 is started, and hot water is circulated through the said flow path.

  The open / close state of each valve and the activated state of each pump in the bath heat recovery mode using the first hot water storage tank 10 are as shown in Table 9 below.

In the bath heat recovery mode using the first hot water storage tank 10, the bath pump 12 is activated and hot water in the external bathtub is introduced into the bath heat exchanger 9. Further, the second main flow path circulation pump 14 is activated, and the water accumulated in the lower part of the first hot water storage tank 10 is extracted and led to the bath heat exchanger 9. If there is hot water in the bathtub and the hot water is higher than normal temperature, there is heat transfer from the bath side to the water on the first hot water storage tank 10 side in the bath heat exchanger 9, and it is included in the remaining hot water in the bath. Thermal energy is recovered.
Then, the water heated in the bath heat exchanger 9 passes through the second main flow path circulation pump 14, the 13th valve, and the second crossover pipe 66 to the first hot water storage tank 10 from the upper a opening of the first hot water storage tank 10. be introduced.

What has been described above is the flow path when the first hot water storage tank 10 recovers the thermal energy contained in the remaining hot water of the bath, but the second hot water storage tank 10 is switched to the second hot water storage tank 11 by switching the first hot water storage tank 10. The heat energy contained in the remaining hot water in the bath can also be recovered in the tank 11.
FIG. 11 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the bath heat recovery mode using the second hot water storage tank 11.

  The open / close state of each valve and the activated state of each pump in the bath heat recovery mode using the second hot water storage tank 11 are as shown in Table 10 below.

(About hot spring mode)
The hot water mode is a mode in which hot water in the first hot water storage tank 10 or the second hot water storage tank 11 is discharged.
FIG. 12 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the hot water mode using the first hot water storage tank 10.
In the hot water discharge mode, only the flow path leading to the hot water supply opening via the water inlet and the first hot water storage tank 10 or the second hot water storage tank 11 is opened, and all other flow paths are blocked.
The open / close state of each valve and the activated state of each pump in the hot water discharge mode using the first hot water storage tank 10 are as shown in Table 11 below.

  In the hot water supply mode using the first hot water storage tank 10, water is introduced into the lower part of the first hot water storage tank 10, and hot water accumulated in the upper part of the first hot water storage tank 10 is pushed out to reach the hot water supply part 52. In the bypass passage 57, the hot water discharged from the first hot water storage tank 10 and the water from the water inlet are mixed to adjust the temperature.

(Still water replacement boiling mode)
In the stay water replacement boiling mode, when cold water is not created, such as in winter, the hot water heated by the hot water supply heat exchanger 3 is circulated through the cooling channel 21 to replace the water remaining in the cooling channel 21, This is an operation mode in which the cooling channel 21 is sterilized with warm water heated at the same time.
FIG. 13 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the stagnant water replacement boiling mode.

In the stay water replacement boiling mode, the heat pump circuit unit 1 and the water circulation circuit 32 are used.
The heat pump circuit unit 1 has the same flow path configuration as that of the direct heating mode.

The water circulation circuit 32 is formed with an annular flow path using both the first main flow path 35 and the second main flow path 36. Specifically, the cold water heat exchanger 2, the 13th valve, the second transition pipe 66, the eighth valve, the second hot water storage tank 11, the first main flow path circulation pump 7, the hot water supply heat exchanger 3, the eleventh valve, the air conditioning The annular flow path returning to the cold water heat exchanger 2 through the heat exchanger 8, the second main flow path circulation pump 14, and the second valve is opened.
And the 1st main flow path circulation pump 7 and the 2nd main flow path circulation pump 14 are started, and hot water is circulated through the said flow path.

  The open / close state of each valve and the activated state of each pump in the stagnant water replacement boiling mode are as shown in Table 12 below.

In the staying water replacement boiling mode, the hot water supply heat exchanger 3 generates a high temperature.
Then, the above-described annular flow path is opened, and hot water heated by the hot water supply heat exchanger 3 by the first main flow path circulation pump 7 and the second main flow path circulation pump 14 is sent to the cooling flow path 21. The water staying in the water is replaced and the cooling channel 21 is sterilized.

(Freeze prevention mode)
In the freezing prevention mode, the water in the water circulation circuit 32 is circulated to prevent the water in the water circulation circuit 32 from freezing at a time when cooling is severe, such as in the morning in winter.
FIG. 14 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the freeze prevention mode.

  In the freeze prevention mode, the water flow circuit 32 is used to form an annular flow path. The specific annular flow path includes, in order from the chilled water heat exchanger 2, the 10th valve, the first main flow path circulation pump 7, the check valve 15, the hot water supply heat exchanger 3, the 11th valve, the cooling / heating heat exchanger 8, 2 Flow path returning to the cold water heat exchanger 2 via the main flow path circulation pump 14 and the second valve. And the 1st main flow path circulation pump 7 and the 2nd main flow path circulation pump 14 are started, and the hot water of the said flow path is circulated.

  The open / close state of each valve and the activation state of each pump in the freeze prevention mode are as shown in Table 13 below.

(Defrost mode with bath heat recovery)
In the defrosting mode by the bath heat recovery, the bath circulation circuit 37 is used to circulate the hot water in the external bathtub in the bath heat exchanger 9 to collect the thermal energy contained in the remaining hot water in the bath, and the water circulation circuit 32 In this operation mode, the heat pump circuit is introduced into the cooling flow path 21 and the heat pump circuit is defrosted using this heat. Moreover, in the defrost mode, the 2nd hot water storage tank 11 is also sprinkled up simultaneously.
FIG. 15 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of the valve and the flow of hot water in the defrost mode by bath heat recovery.

In the defrosting mode by bath heat recovery, the heat pump circuit unit 1, the water circulation circuit 32, and the bath circulation circuit 37 are used.
In the heat pump circuit unit 1, the compressor 6 is activated to distribute the heat medium to the heat pump circuit. At this time, the heat pump circuit unit 1 is configured such that the fifteenth valve is in the open state and the sixteenth valve is in the closed state, and the heat medium flows to the cold water heat exchanger 2 instead of the bypass flow path 23. The fourteenth valve is in an open state, and the number of air heat exchangers 5 through which the heat medium flows is two. As a result, the heat medium flow path side of the hot water supply heat exchanger 3 becomes high temperature, and the heat medium flow path side of the cold water heat exchanger 2 becomes low temperature.

In the water circulation circuit 32, the first main channel 35 and the second main channel 36 are made independent (edge cutting).
As for the 1st main channel 35, the same annular channel as the above-mentioned direct cooling mode which connects hot water supply heat exchanger 3 and the 2nd hot water storage tank 11 is opened, and other channels are closed. And the 1st main flow path circulation pump 7 is started, and hot water is circulated through the said flow path.

  The second main flow path 36 opens an annular flow path connecting the cold water heat exchanger 2 and the bath heat exchanger 9 and closes the other flow paths. A specific annular flow path is a flow path that returns from the cold water heat exchanger 2 to the cold water heat exchanger 2 via the first transition pipe 65, the bath heat exchanger 9, and the second main flow path circulation pump 14. And the 2nd main flow path circulation pump 14 is started, and hot water is circulated through the said flow path.

The bath circulation circuit 37 circulates hot water from an external bathtub in the bath heat exchanger 9 to recover thermal energy contained in the remaining hot water in the bath. That is, the bath pump 12 is activated and hot water in the external bathtub is introduced into the bath heat exchanger 9.
The open / close state of each valve and the activation state of each pump in the defrost mode by bath heat recovery are as shown in Table 14 below.

In the defrosting mode by bath heat recovery, a high temperature is created by the hot water supply heat exchanger 3 and the cold water heat exchanger 2 is at a low temperature.
As described above, in the first main channel 35, the annular channel connecting the hot water heat exchanger 3 and the second hot water storage tank 11 is opened, and the hot water in the channel is circulated and moved by the first main channel circulation pump 7. The Therefore, the hot water passing through the hot water supply heat exchanger 3 is supplied to the upper side of the second hot water storage tank 11 by the first main channel circulation pump 7.
In the second hot water storage tank 11, hot hot water is stored in layers from the second hot water storage tank 11. The low temperature hot water is pushed out from the bottom of the second hot water storage tank 11 and returns to the hot water supply heat exchanger 3.

Although the cold water heat exchanger 2 has a low temperature, in the defrosting mode by bath heat recovery, the temperature of the cold water heat exchanger 2 is increased by the heat recovered from the bath.
Specifically, the bath pump 12 is activated and hot water in the external bathtub is introduced into the bath heat exchanger 9. At the same time, the second main channel circulation pump 14 is activated, and the hot water discharged from the second main channel circulation pump 14 passes through the bath heat exchanger 9. Here, there is hot water in the bathtub, and if the hot water is higher than room temperature, there is heat transfer from the bath side to the water on the second main flow path 36 side in the bath heat exchanger 9, and it is included in the remaining hot water in the bath The recovered heat energy is recovered and the temperature of the water on the second main flow path 36 side is raised. Therefore, the heated water enters the cold water heat exchanger 2, and the cold water heat exchanger 2 is heated and defrosted.

(About tank heating and hot water storage simultaneous mode (heating and hot water storage combined mode))
In the tank heating and hot water storage simultaneous mode (heating and hot water storage combined mode), hot water is extracted from the first hot water storage tank 10 or the second hot water storage tank 11 and used for heating, and at the same time, the heat pump circuit unit 1 is operated to generate hot water. This is a mode in which this is stored in the first hot water storage tank 10 or the second hot water storage tank 11.
FIG. 16 is an operation principle diagram of the heat pump system of the present invention, and shows the open / close state of valves and the flow of hot water in the tank heating and hot water storage simultaneous mode. In the tank heating and hot water storage simultaneous mode (heating and hot water storage combined mode), there are a case where the first hot water storage tank 10 is used and a case where the second hot water storage tank 11 is used, but FIG. The operation principle diagram when using is shown.

In the tank heating and hot water storage simultaneous mode (heating / hot water storage combined mode), the heat pump circuit unit 1, the cooling / heating circuit 20, and the water circulation circuit 32 are used.
The heat pump circuit unit 1 has the same flow path configuration as that of the direct heating mode.
The flow path configuration of the cooling / heating circuit 20 is the same as in the cooling mode using the hot water storage tank or the direct cooling mode.

The water circulation circuit 32 makes the first main channel 35 and the second main channel 36 independent (edge cutting), and uses both the first main channel 35 and the second main channel 36.
The 1st main flow path 35 opens the annular flow path which connects the hot water supply heat exchanger 3 and the 1st hot water storage tank 10, and closes another flow path similarly to the above-mentioned warm water storage mode. And the 1st main flow path circulation pump 7 is started, and hot water is circulated through the said flow path.

  The second main flow path 36 opens an annular flow path connecting the cooling / heating heat exchanger 8 and the first hot water storage tank 10 and closes the other flow paths as in the tank heating mode using the hot water storage tank. And the 2nd main flow path circulation pump 14 is started, and hot water is circulated through the said flow path.

  The open / close state of each valve and the activated state of each pump in the tank heating and hot water storage simultaneous mode are as shown in Table 15 below.

In the tank heating and hot water storage simultaneous mode, the hot water supply heat exchanger 3 generates a high temperature.
As described above, the first main flow path 35 opens the annular flow path connecting the hot water supply heat exchanger 3 and the first hot water storage tank 10, and hot water in the flow path is circulated and moved by the first main flow path circulation pump 7. The hot water passing through the hot water supply heat exchanger 3 is supplied to the upper side of the first hot water storage tank 10 by the first main flow path circulation pump 7, and hot hot water is stored in layers from above the first hot water storage tank 10.
The low temperature hot water is pushed out from the bottom of the first hot water storage tank 10 and returns to the hot water supply heat exchanger 3.

  Further, in the tank heating and hot water storage simultaneous mode, the hot water accumulated on the upper side of the first hot water storage tank 10 is discharged from the upper opening a of the first hot water storage tank 10 and reaches the cooling / heating heat exchanger 8. Then, heat is exchanged with the brine flowing through the cooling / heating circuit 20 in the cooling / heating heat exchanger 8 to raise the temperature of the brine.

  The brine whose temperature has been increased by receiving heat from the air conditioning / heating heat exchanger 8 reaches the external air conditioning / heating terminal 40 and contributes to heating. The brine that has exited the air conditioning terminal 40 returns to the air conditioning and heat exchanger 8 via the expansion tank 16 and the brine circulation pump 13.

  Next, the operation of the heat pump system, particularly the operation in the heat pump circuit unit 1, will be described in detail with reference to the flowcharts of FIGS. 17 and 18 are flowcharts showing the operation of the heat pump system of the present invention.

  In step 1 of FIG. 17, it is determined whether or not there is an operation request for the heat pump system. If it is determined that there is an operation request, the control flow proceeds to step 2.

  In step 2, the outside air temperature is detected by the outside air temperature detecting sensor of the heat pump circuit unit 1, and the detected outside air temperature is sent to the heat pump control unit. Then, the control flow moves to step 3.

In step 3, it is determined whether or not the heat pump circuit unit 1 has a cold water creation request.
The heat pump system of this embodiment can be operated in various operation modes as described above. Among the above operating modes, the direct heating mode, hot water storage mode, stagnant water replacement boiling mode, defrosting mode by bath heat recovery, tank heating and hot water storage simultaneous mode (heating / hot water storage combined mode) 1 corresponds to a warm water mode in which only warm water is created and cold water is not created.
On the other hand, the direct cooling mode and the cold / hot water storage mode correspond to the cold / hot water mode in which both the cold water and the hot water are created in the heat pump circuit unit 1.
In step 3, if the requested operation mode is included in the cold / hot water mode, the control flow proceeds to step 4. If the requested operation mode is included in the hot water mode, the control flow proceeds to step 5.

In step 4, the heat pump circuit unit 1 is set to be in the cold / hot water mode. In step 5, the heat pump circuit unit 1 is set to be in the warm water mode.
Specifically, the 14th to 16th valves of the heat pump circuit unit 1 are opened and closed corresponding to the requested operation mode. Thereafter, the control flow proceeds to step 6.

  In step 6, the rotational speed of the blower 26 of the heat pump circuit unit 1 is determined. The number of rotations of the blower 26 is determined based on the outside air temperature detected in step 2 or the like. Then, the control flow proceeds to step 7.

In Step 7, the operation of the blower 26 is started, and the control flow is shifted to Step 8.
In step 8, the rotation speed of the compressor is determined according to the outside air temperature and the required capacity, and the control flow is shifted to step 9.
In step 9, the hot water target temperature range which is the temperature range of the water adjusted with the hot water supply heat exchanger 3 of the heat pump circuit unit 1 is determined. In the cold / hot water mode, a cold water target temperature range that is a temperature range of water adjusted by the cold water heat exchanger 2 is also determined. Then, the control flow proceeds to step 10.

In step 10, the rotational speed of the pump included in the heat storage unit 30 is determined. The number of rotations of the first main channel circulation pump 7, the second main channel circulation pump 14, the brine circulation pump 13, and the bath pump 12 included in the heat storage unit 30 is the target temperature determined in Step 9 or requested. It is determined according to the operation mode. Then, the control flow proceeds to step 11.
In Step 11, the operation of the pump included in the heat storage unit 30 is started, and the control flow is shifted to Step 12 in FIG.

  In step 12 of FIG. 18, the temperature of the water sent from the water circulation circuit 32 to the heat pump circuit unit 1 is detected. Specifically, the temperature of the water fed to the hot water supply heat exchanger 3 is detected by a hot water supply inlet side sensor 75 provided in the vicinity of the inlet side of the secondary side flow path of the hot water supply heat exchanger 3. Furthermore, in the cold / hot water mode, the temperature of the water fed into the cold water heat exchanger 2 is detected by the cold water inlet side sensor 77 provided in the vicinity of the inlet side of the secondary flow path of the cold water heat exchanger 2. Then, the control flow proceeds to step 13.

In step 13, the opening degree of the expansion valve 4 is determined. The opening degree of the expansion valve 4 is determined by the heat pump control unit based on the target temperature determined in step 9, the temperature of water sent to the heat pump circuit unit 1 detected in step 12, and the like. Then, the control flow proceeds to step 14.
In step 14, the expansion valve 4 is adjusted so that the opening degree determined in step 13 is reached, and the control flow proceeds to step 15.
In step 15, the operation of the compressor is started, and the circulation of the heat medium in the heat pump circuit unit 1 is started. The compressor is driven at the rotational speed determined in step 8. Then, the control flow proceeds to step 16.

  In step 16, the hot water temperature, which is the temperature of the hot water delivered from the hot water supply heat exchanger 3, is detected. Specifically, the hot water supply temperature is detected by a hot water supply outlet sensor 76 provided in the vicinity of the outlet side of the secondary flow path of the hot water supply heat exchanger 3. Then, the control flow proceeds to step 17.

  In step 17, it is determined whether or not the tapping temperature detected in step 16 is lower than the lower limit temperature of the hot water target temperature range determined in step 9. If the tapping temperature is lower than the lower limit temperature, the control flow is returned to step 8. If the tapping temperature is not lower than the lower limit temperature, the control flow is shifted to step 18.

  In step 18, it is determined whether the tapping temperature is higher than the upper limit temperature of the hot water target temperature range. If the tapping temperature is higher than the upper limit temperature, the control flow is returned to step 8. If the tapping temperature is not higher than the upper limit temperature, the control flow is shifted to step 19.

  In step 19, it is determined whether or not the requested operation mode corresponds to the cold / hot water mode. That is, in step 19, it is determined whether or not cold water is created in the requested operation mode. Then, if the requested operation mode corresponds to the cold / hot water mode, the control flow proceeds to step 20, and if not, the control flow returns to step 1.

  In step 20, the temperature of the discharged water, which is the temperature of the hot water sent from the cold water heat exchanger 2, is detected. Specifically, the water discharge temperature is detected by a cold water discharge side sensor 78 provided in the vicinity of the discharge side of the secondary flow path of the cold water heat exchanger 2. Then, the control flow proceeds to step 21.

  In step 21, it is determined whether or not the outlet water temperature is lower than the lower limit temperature of the cold water target temperature range. When the temperature of the discharged water is lower than the lower limit temperature, it is determined that the temperature of the heat medium flowing through the primary flow path of the cold water heat exchanger 2 is too low, and the control flow proceeds to step 22. If the outlet temperature is not lower than the lower limit temperature, the control flow proceeds to step 25.

  In step 22, in order to increase the heating amount in the air heat exchanger 5 (third heat exchanger) for the heat medium circulating in the heat pump circuit unit 1, a request to increase the rotational speed of the blower 26 is made, and the control flow is The process proceeds to step 23.

  In step 23, it is determined whether or not the rotational speed of the blower 26 requested in step 22 is higher than a predetermined upper limit value. If the requested rotational speed of the blower 26 is higher than a predetermined upper limit value, the control flow proceeds to step 24. If the requested rotational speed of the blower 26 is not higher than the predetermined upper limit value, the control flow is returned to step 1.

In step 24, the fourteenth valve of the heat pump circuit unit 1 is opened, and the number of the air heat exchangers 5 through which the heat medium flows is increased. Thereby, the heating amount of the heat medium in the heat pump circuit unit 1 can be increased without increasing the rotational speed of the blower 26. At this time, in order to gradually increase the heating amount in the air heat exchanger 5, the number of the air heat exchangers 5 may be increased and the rotational speed of the blower 26 may be decreased.
Then, the control flow is returned to step 1.

  In step 25, it is determined whether or not the outlet water temperature is higher than the upper limit temperature of the cold water target temperature range. When the temperature of the discharged water is higher than the upper limit temperature, the temperature of the heat medium flowing through the primary flow path of the chilled water heat exchanger 2 is regarded as too high, and the control flow is shifted to step 26, and the discharged water temperature is not higher than the upper limit temperature. If so, control flow returns to step 1.

  In step 26, in order to reduce the amount of heating in the air heat exchanger 5 for the heat medium circulating in the heat pump circuit unit 1, a request to reduce the rotational speed of the blower 26 is made, and the control flow proceeds to step 27.

  In step 27, it is determined whether or not the rotational speed of the blower 26 requested in step 26 is lower than a predetermined lower limit value. If the requested rotational speed of the blower 26 is lower than the predetermined lower limit value, the control flow proceeds to step 28. If the requested rotation speed of the blower 26 is not lower than the predetermined lower limit value, the control flow is returned to step 1.

In step 28, the fourteenth valve of the heat pump circuit unit 1 is closed, and the number of the air heat exchangers 5 through which the heat medium flows is reduced. Thereby, the heating amount of the heat medium in the heat pump circuit unit 1 can be reduced without reducing the rotational speed of the blower 26. At this time, in order to gradually reduce the amount of heating in the air heat exchanger 5, the number of air heat exchangers 5 may be reduced and the rotational speed of the blower 26 may be increased.
Then, the control flow is returned to step 1, and the heat pump system continues to operate.

  Although the air conditioning circuit 20 of the said embodiment circulates a brine, this invention is not necessarily limited to such a structure. For example, the configuration may be such that water is circulated in the cooling / heating circuit 20 instead of brine. When water is used as a heat medium, the viscosity of the heat medium is unlikely to increase even at low temperatures, so that a decrease in heat exchange performance and an increase in power consumption of the circulation pump can be prevented.

In the heat pump system of the above embodiment, the three-way valve is frequently used for switching the circuit. However, a plurality of two-way valves may be used to replace the three-way valve.
Moreover, although the air-conditioning / heating circuit 20 shown in the figure is an open type, it may be a semi-hermetic type or a hermetic type.

It is an operation | movement principle figure of the heat pump system of this invention. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the air_conditioning | cooling mode using a hot water storage tank, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the opening-and-closing state of the valve in the direct cooling mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the cold / hot water storage mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the opening-and-closing situation of the valve in the tank heating mode using a 1st hot water storage tank, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the tank heating mode using a 2nd hot water storage tank, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the direct heating mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the opening-and-closing state of the valve in the warm water storage mode (2nd hot water storage tank), and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the warm water storage mode (1st hot water storage tank), and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the bath heat recovery (1st hot water storage tank) mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the bath heat recovery (2nd hot water storage tank) mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the hot water mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the stagnant water exchange boiling mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the freeze prevention mode, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the open / close state of the valve in the defrost mode by bath heat recovery, and the flow of hot water. It is an operation | movement principle figure of the heat pump system of this invention, and shows the opening-and-closing state of the valve in the tank heating and warm water storage simultaneous mode (heating and hot water storage combined use mode), and the flow of hot water. It is a flowchart which shows operation | movement of the heat pump system of this invention. It is a flowchart which shows operation | movement of the heat pump system of this invention.

Explanation of symbols

1 Heat pump circuit 2 Chilled water heat exchanger (second heat exchanger)
3 Hot water supply heat exchanger (first heat exchanger)
4 Expansion valve (expansion means)
5 Air heat exchanger (3rd heat exchanger)
6 Compressor 8 Heating / cooling heat exchanger (4th heat exchanger)
10 1st hot water storage tank (storage tank)
11 Second hot water storage tank (storage tank)
DESCRIPTION OF SYMBOLS 13 Brine circulation pump 16 Expansion tank 20 Air conditioning / heating circuit 23 Bypass flow path 26 Blower 32 Water distribution circuit 40 Air conditioning / heating terminal 78 Chilled water outlet side sensor

Claims (9)

A water distribution circuit connected to a storage tank for storing hot water and flowing hot water;
A compressor, a first heat exchanger, expansion means, and a heat pump circuit for connecting the at least one evaporator to circulate the heat medium,
The first heat exchanger heats water in the water circulation circuit by performing heat exchange between the heat medium of the heat pump circuit and the water in the water circulation circuit,
At least one of the evaporators is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water circulation circuit to cool the water of the water circulation circuit,
The water circulation circuit can form a hot water circulation channel including a storage tank and a first heat exchanger, and a cold water circulation channel including a storage tank and a second heat exchanger,
The heat pump circuit is provided with a bypass flow path that bypasses the second heat exchanger, and when heat exchange by the second heat exchanger is unnecessary, a heat medium is caused to flow through the bypass flow path ,
The heat pump circuit includes a plurality of evaporators arranged in parallel downstream of the bypass flow path, and a blower capable of blowing air to the plurality of evaporators,
The plurality of evaporators is a third heat exchanger that heats the heat medium of the heat pump circuit by performing heat exchange between the air from the blower and the heat medium of the heat pump circuit,
By switching the number of third heat exchangers through which the heat medium flows, the amount of heat exchange in the third heat exchanger is adjusted,
Temperature detecting means for detecting the temperature of water in the water circulation circuit cooled by the second heat exchanger;
A heat pump system comprising: a heat pump control unit that increases the rotational speed of the blower on condition that the detected temperature detected by the temperature detecting unit is lower than a target temperature . 2. The heat pump system according to claim 1 , wherein the heat pump control unit increases the number of third heat exchangers through which the heat medium flows, on condition that the rotational speed of the blower exceeds a predetermined upper limit value. . Temperature detecting means for detecting the temperature of water in the water circulation circuit cooled by the second heat exchanger;
The heat pump control part which reduces the rotation speed of an air blower is provided on condition that the detected temperature detected by the said temperature detection means becomes higher than target target temperature, The Claim 1 or 2 characterized by the above-mentioned. The described heat pump system. A water distribution circuit connected to a storage tank for storing hot water and flowing hot water;
A compressor, a first heat exchanger, expansion means, and a heat pump circuit for connecting the at least one evaporator to circulate the heat medium,
The first heat exchanger heats water in the water circulation circuit by performing heat exchange between the heat medium of the heat pump circuit and the water in the water circulation circuit,
At least one of the evaporators is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water circulation circuit to cool the water of the water circulation circuit,
The water circulation circuit can form a hot water circulation channel including a storage tank and a first heat exchanger, and a cold water circulation channel including a storage tank and a second heat exchanger,
The heat pump circuit is provided with a bypass flow path that bypasses the second heat exchanger, and when heat exchange by the second heat exchanger is unnecessary, a heat medium is caused to flow through the bypass flow path,
The heat pump circuit includes a plurality of evaporators arranged in parallel downstream of the bypass flow path, and a blower capable of blowing air to the plurality of evaporators,
The plurality of evaporators is a third heat exchanger that heats the heat medium of the heat pump circuit by performing heat exchange between the air from the blower and the heat medium of the heat pump circuit,
By switching the number of third heat exchangers through which the heat medium flows, the amount of heat exchange in the third heat exchanger is adjusted,
Temperature detecting means for detecting the temperature of water in the water circulation circuit cooled by the second heat exchanger;
A heat pump system comprising: a heat pump control unit that reduces the rotational speed of the blower on condition that the detected temperature detected by the temperature detecting means is higher than a target temperature . The heat pump control unit, under the condition that the rotational speed of the blower is below a predetermined lower limit value, to decrease the number of the third heat exchanger heat medium is flowed according to claim 3 or 4, wherein Heat pump system. A water distribution circuit connected to a storage tank for storing hot water and flowing hot water;
A compressor, a first heat exchanger, expansion means, and a heat pump circuit for connecting the at least one evaporator to circulate the heat medium,
The first heat exchanger heats water in the water circulation circuit by performing heat exchange between the heat medium of the heat pump circuit and the water in the water circulation circuit,
At least one of the evaporators is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water circulation circuit to cool the water of the water circulation circuit,
The water circulation circuit can form a hot water circulation channel including a storage tank and a first heat exchanger, and a cold water circulation channel including a storage tank and a second heat exchanger,
The heat pump circuit is provided with a bypass flow path that bypasses the second heat exchanger, and when heat exchange by the second heat exchanger is unnecessary, a heat medium is caused to flow through the bypass flow path,
The heat pump circuit includes a plurality of evaporators arranged in parallel downstream of the bypass flow path, and a blower capable of blowing air to the plurality of evaporators,
The plurality of evaporators is a third heat exchanger that heats the heat medium of the heat pump circuit by performing heat exchange between the air from the blower and the heat medium of the heat pump circuit,
By switching the number of third heat exchangers through which the heat medium flows, the amount of heat exchange in the third heat exchanger is adjusted,
Temperature detecting means for detecting the temperature of water in the water circulation circuit cooled by the second heat exchanger;
A heat pump control unit that increases the number of third heat exchangers through which the heat medium flows, on condition that the detected temperature detected by the temperature detecting unit is lower than a target temperature. And heat pump system. Temperature detecting means for detecting the temperature of water in the water circulation circuit cooled by the second heat exchanger;
A heat pump control unit that reduces the number of third heat exchangers through which the heat medium flows, on condition that the detected temperature detected by the temperature detecting unit is higher than a target temperature. The heat pump system according to claim 6 . A water distribution circuit connected to a storage tank for storing hot water and flowing hot water;
A compressor, a first heat exchanger, expansion means, and a heat pump circuit for connecting the at least one evaporator to circulate the heat medium,
The first heat exchanger heats water in the water circulation circuit by performing heat exchange between the heat medium of the heat pump circuit and the water in the water circulation circuit,
At least one of the evaporators is a second heat exchanger that performs heat exchange between the heat medium of the heat pump circuit and the water of the water circulation circuit to cool the water of the water circulation circuit,
The water circulation circuit can form a hot water circulation channel including a storage tank and a first heat exchanger, and a cold water circulation channel including a storage tank and a second heat exchanger,
The heat pump circuit is provided with a bypass flow path that bypasses the second heat exchanger, and when heat exchange by the second heat exchanger is unnecessary, a heat medium is caused to flow through the bypass flow path,
The heat pump circuit includes a plurality of evaporators arranged in parallel downstream of the bypass flow path, and a blower capable of blowing air to the plurality of evaporators,
The plurality of evaporators is a third heat exchanger that heats the heat medium of the heat pump circuit by performing heat exchange between the air from the blower and the heat medium of the heat pump circuit,
By switching the number of third heat exchangers through which the heat medium flows, the amount of heat exchange in the third heat exchanger is adjusted,
Temperature detecting means for detecting the temperature of water in the water circulation circuit cooled by the second heat exchanger;
A heat pump control unit that reduces the number of third heat exchangers through which the heat medium flows, on condition that the detected temperature detected by the temperature detecting unit is higher than a target temperature. And heat pump system. An air conditioning circuit that circulates the heat medium and supplies heat energy to the air conditioning terminal is provided.
The air conditioning circuit includes an expansion tank, a circulation pump that circulates the heat medium, and a fourth heat exchanger that exchanges heat between the heat medium of the air conditioning circuit and the water of the water circulation circuit,
The heat pump according to any one of claims 1 to 8, wherein an expansion tank and a circulation pump are arranged upstream of the fourth heat exchanger, and an air conditioning terminal is connected to the downstream side of the fourth heat exchanger. system.

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