KR101610958B1 - Water circulation system associated with refrigerant cycle and the method of controlling the same - Google Patents

Abstract

The present invention relates to a refrigerant cycle interlocked water circulation system including a bypass pipe for guiding water to bypass a heating tank. Therefore, in the present invention, when the use of the heating tank is not required, there is an advantage that the flow resistance of the water, that is, the pressure loss can be minimized.

Refrigerant cycle, heating tank, bypass pipe

Description

Technical Field The present invention relates to a water circulation system and a control method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water circulation system that performs hot water supply and heating functions in conjunction with a refrigerant cycle.

Conventionally, the indoor heating is performed by an air conditioner using a refrigerant cycle, and the hot water supply is performed by a boiler having a separate heating source.

More specifically, the air conditioner includes an outdoor unit installed outdoors and an indoor unit installed in the room. The outdoor unit is provided with a compressor for compressing the refrigerant, an outdoor heat exchanger for exchanging heat between the refrigerant and outdoor air, and a decompression device for expanding the refrigerant. The indoor unit is provided with an indoor heat exchanger for heat exchange between the refrigerant and the room air. At this time, any one of the outdoor heat exchanger and the indoor heat exchanger functions as a condenser and the other operates as an evaporator, and the compressor, outdoor heat exchanger, decompressor, and indoor heat exchanger perform a refrigerant cycle.

The boiler generates heat by using oil, gas or electricity, and supplies hot water by heating water or performs floor heating.

The present invention is to provide a water circulation system linked to a refrigerant cycle capable of minimizing the flow resistance of water.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

As described above, the proposed water circulation system for refrigerant cycle interlocking according to the present invention comprises: an outdoor unit including an outdoor heat exchanger for exchanging heat between refrigerant and outdoor air; and a compressor for compressing the refrigerant; An indoor unit including a water-refrigerant heat exchanger for performing heat exchange between the refrigerant and water, a heating tank for heating the water, and a water pump for forcedly flowing the water; A heating unit through which water discharged from the indoor unit flows for indoor heating; A hot water supply unit in which water discharged from the indoor unit flows for hot water supply; An indoor unit piping connecting the water refrigerant heat exchanger, the heating tank, and the water pump; And a bypass pipe for guiding the water to bypass the heating tank.

As described above, according to the water circulation system linked to the refrigerant cycle according to the present invention, when heating of water by the heating heater is not required, water flows by bypassing the heating tank. Therefore, there is an advantage that the flow resistance, that is, the pressure loss, which occurs when the water passes through the heating tank, can be minimized.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a water circulation system linked to a refrigerant cycle according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an embodiment of a water circulation system linked with a refrigerant cycle according to the present invention.

Referring to FIG. 1, a water circulation system 1 according to an embodiment of the present invention includes a heat pump in which a refrigerant cycle is performed, and an indoor heat transfer part in which water for heat exchange with the refrigerant flows for hot water supply and heating of the room do.

Specifically, the heat pump includes a compressor 21 for compressing the refrigerant to a high temperature and a high pressure, a four-way valve 22 for regulating the flow direction of the refrigerant discharged from the compressor 21, A water-refrigerant heat exchanger 31 in which high-temperature, high-pressure refrigerant having passed through the valve 22 is heat-exchanged with water flowing along a water pipe of the indoor heat-transfer portion, and a water-refrigerant heat exchanger An expansion part 24 for allowing the refrigerant that has passed through to expand at a low temperature and a low pressure and an outdoor heat exchanger 23 for allowing refrigerant having passed through the expansion part 24 to exchange heat with outdoor air. The compressor 21, the four-way valve 22, the water-refrigerant heat exchanger 31, the expansion unit 24, and the outdoor heat exchanger 23 are connected by a refrigerant pipe 25 to constitute a refrigerant cycle closed circuit .

On the other hand, the water circulation system (1) comprises an outdoor unit (2) including a refrigerant cycle, an indoor unit (3) for exchanging heat between the refrigerant and the water that is changed in phase along the refrigerant cycle, A hot water supply part 4 connected to the indoor unit 3 for heating the indoor unit 3, a heating unit 5 connected to the indoor unit 3 for heating the room, And a water pipe connecting the indoor unit, the hot water supply unit, and the heating unit.

Here, the compressor 21, the four-way valve 22, the expansion unit 24, and the outdoor heat exchanger 23 included in the heat pump are installed in the outdoor unit 2 located outdoors. When the outdoor unit 2 is operated in the cooling mode, the outdoor heat exchanger 23 performs the function of the evaporator. When the outdoor unit 2 operates in the heating mode, the outdoor heat exchanger 23 performs the function of the condenser.

Further, the water-refrigerant heat exchanger (31) included in the heat pump is installed in the indoor unit (3) located in the room. In addition, the indoor unit 3 is provided with a water-refrigerant heat exchanger 31 and a flow switch installed in a water pipe extending to the outlet side of the water-refrigerant heat exchanger 31, An expansion tank 33 branched from the flow switch 32 at a position spaced apart from the flow direction of the water and a water pipe 33 extending from the outlet side of the water refrigerant heat exchanger 31, And a water pump 36 provided at any point of the water pipe at the outlet side of the heating tank 34 is connected to the heating tank 34. The heating tank 34 is provided with a heater 35 at one side thereof, Respectively.

More specifically, the water-refrigerant heat exchanger (31) exchanges heat between refrigerant flowing along the refrigerant cycle closed circuit and water flowing along the water pipe, and for example, a plate heat exchanger is applicable. In the water-refrigerant heat exchanger (31), a flow path is formed in which the refrigerant and the water flow independently of each other while exchanging heat with each other, and the water that flows through the flow path and is heat-exchanged with the refrigerant is called a working fluid or a circulating fluid can do.

In this case, when the system 1 is operated in the hot water supply mode or the heating mode, the water refrigerant heat exchanger 31 performs heat exchange between the high-temperature and high-pressure gas refrigerant that has passed through the compressor 21, ≪ / RTI > That is, when the system 1 is operated in the hot water supply mode or the heating mode, the water flowing into the water-refrigerant heat exchanger 31 flows through the hot water supply unit 4 or the heating unit 5, And is in a state of being cooled.

In addition, the expansion tank 33 performs a buffering function of absorbing the water when the volume of the heated water is expanded to an appropriate level or higher while passing through the water-refrigerant heat exchanger 31.

The heating tank (34) is a container for collecting water that has passed through the water-refrigerant heat exchanger (31). A heat heater 35 is installed on one side of the heating tank 34 to selectively operate when the amount of heat absorbed through the water-refrigerant heat exchanger 31 does not reach the required heat quantity.

An air vent 343 is formed on the upper side of the heating tank 34 so that the overheated air existing in the heating tank 34 is discharged. A pressure gauge 341 and a relief valve 342 are provided on either side of the heating tank 34 so that the pressure in the heating tank 34 can be appropriately adjusted. For example, when the internal water pressure of the heating tank 34 displayed through the pressure gauge 341 is excessively high, the relief valve 342 is opened so that the pressure in the tank can be appropriately adjusted.

The water pump 36 pumps the water discharged through the water pipe extending from the outlet of the heating tank 34 to be supplied to the hot water supply unit 4 and the heating unit 5.

The water pipe includes an indoor pipe 30 connecting the water refrigerant heat exchanger 31, the heating tank 34 and the water pump, and water discharged from the indoor unit 3 to the hot water supply unit 4, And a heating pipe 53 for guiding the water discharged from the indoor unit 3 to the heating unit 5. [

On the other hand, the indoor heat transfer section includes the hot water supply section 4 and the heating section 5.

First, the hot water supply unit 4 is a part for warming and supplying water necessary for a work such as washing or washing dishes. Specifically, a three-way valve 60 is provided at a point spaced apart from the water pump 36 in the direction of water flow to control the flow of water. The first flow switching unit 60 is a direction switching valve that allows the water pumped by the water pump 36 to flow into the hot water supply unit 4 or the heating unit 5. A hot water pipe 48 extending to the hot water supply unit 4 and a heating pipe 53 extending to the heating unit 5 are connected to the outlet of the first flow switching unit 60. The water pumped by the water pump 36 selectively flows to either the hot water pipe 48 or the heating pipe 53 under the control of the first flow switching unit 60.

The hot water supply unit 4 includes a hot water tank 41 for storing water supplied from the outside and heating the stored water and a heater 42 provided inside the hot water tank 41. A water inlet 411 for introducing cold water and a water outlet 412 for discharging heated water are provided on one side of the hot water supply unit 4.

Part of the hot water supply pipe extending from the first flow switching unit 60 is drawn into the hot water tank 41 to heat the water stored in the hot water tank 41. That is, heat is transferred from the hot water flowing along the inside of the hot water pipe 48 to the water stored in the hot water tank 41. In a specific case, the heating heater 42 may be operated to further supply additional heat. For example, it can operate when water needs to be warmed up in a short time, such as when the user needs a lot of hot water to bathe.

According to the embodiment, the water outlet 412 may be connected to a hot water discharge device such as a shower 45 or a household appliance such as a humidifier 46.

The heating unit 5 includes a floor heating unit 51 formed by partially embedding the heating pipe 53 in the floor of the room and a floor heating unit 51 branched from any point of the heating pipe 53, And an air heating unit 52 connected in parallel with the air conditioning unit 51.

In detail, the floor heating unit 51 may be embedded in meander lines on the floor of the room as shown in the figure. The air heating unit 52 may be a fan coil unit, a radiator, or the like. A portion of the air heating pipe (52) branching from the heating pipe (53) is provided as heat exchanging means. The flow path switching valves 55 and 56 are provided at points where the air heating pipe 54 is branched so that the refrigerant flowing along the heating pipe 53 flows through the bottom heating part 51 and the air heating part 52 ) Or it can be made to flow to either side.

The end of the hot water piping 48 extending from the first flow switching portion 60 is joined at a position where the hot water piping 48 is spaced apart from the outlet end of the air heating pipe 54 in the direction of water flow. Therefore, in the hot water supply mode, the refrigerant flowing along the hot water supply pipe (48) is reintroduced into the heating pipe (53) and then flows into the water refrigerant heat exchanger (31).

Here, a check valve V is provided at a point where the reverse flow shutoff is required, such as a point where the hot water pipe 48 is merged with the heating pipe 53, so that backflow of water can be prevented. In the same manner, it is also possible to provide a check valve at the outlet end of the air heating pipe 54 and at the outlet end of the bottom heating part 51, respectively, in addition to the method in which the flow path switching valve 56 is installed.

On the other hand, the water pipe further includes a bypass pipe (37) for guiding water discharged from the water-refrigerant heat exchanger (31) to bypass the heating tank. One end of the bypass pipe 37 is connected to the indoor unit pipe 30 between the water refrigerant heat exchanger 31 and the heating tank 34 and the other end of the bypass pipe 37 is connected to the heating tank 34 And the water pump 36, respectively.

The indoor unit 3 further includes a second flow switching unit 38 for switching the flow direction of the water so that the water passes through the heating tank 34 or bypasses the heating tank 34. The second flow switching portion 38 is installed at a point where one end of the bypass pipe 37 is connected to the indoor air pipe 30.

Hereinafter, the refrigerant flow when the heating or the hot water supply is performed in the embodiment of the water circulation system linked with the refrigerant cycle according to the present invention will be described in detail.

FIG. 2 is a view showing a refrigerant flow in the case where indoor heating is performed in the embodiment of the water circulation system linked with the refrigerant cycle according to the present invention. FIG. FIG. 5 is a view showing a refrigerant flow in the case where the refrigerant is carried out.

Referring to FIG. 2, when the water circulation system 1 connected to the refrigerant cycle according to the present invention is operated in a heating mode, the refrigerant discharged from the compressor 21 flows through the water refrigerant heat exchanger 31, Lt; / RTI > The refrigerant passes through the water-refrigerant heat exchanger (31) and discharges heat to the water to be condensed. The refrigerant that has passed through the water-refrigerant heat exchanger (31) is expanded while passing through the expansion portion (24), and is then evaporated by absorbing heat from the outdoor air while passing through the outdoor heat exchanger (23). The refrigerant that has passed through the outdoor heat exchanger (23) flows into the compressor (21) and is compressed again.

On the other hand, as for the flow of water, the water discharged from the water pump 36 flows into the heating section 5. The water flowing into the heating unit 5 is branched into the air heating unit 52 and the floor heating unit 51 and flows into the indoor unit 3 after merging again. At this time, in the course of the water passing through the air heating part 52 and the floor heating part 51, the water releases heat to the indoor air and the floor, and the indoor heating is performed.

The refrigerant flowing into the indoor unit (3) passes through the water refrigerant heat exchanger (31), absorbs heat from the refrigerant, and then flows into the water pump (36).

3, on the other hand, the refrigerant flow in the case where the water circulating system 1 linked with the refrigerant cycle according to the present invention is operated in the hot water supply operation is the same as that in the case where the system 1 is in the heating operation. However, the flow of water differs in that the water discharged from the indoor unit 3 flows into the hot water supply unit 4.

More specifically, the water discharged from the indoor unit (3) flows into the hot water supply unit (4) along the hot water supply pipe (48). The water flowing into the hot water tank 41 flows into the indoor unit 3 along the hot water pipe 48 after heating the water stored in the hot water tank 41.

Hereinafter, the water flow inside the indoor unit in the water circulation system linked to the refrigerant cycle according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a view showing a water flow when water is bypassed in a heating tank in an indoor unit of an embodiment of a water circulation system linked to a refrigerant cycle according to the present invention, and FIG. 5 is a view showing a water circulation system FIG. 5 is a view showing water flow when water flows through a heating tank in an indoor unit. FIG.

Referring to FIG. 4, there is a case where heating or hot water supply can be sufficiently performed only by the amount of heat obtained by the water through the heat exchange with the refrigerant in the water-refrigerant heat exchanger (31). In this case, the water discharged from the water-refrigerant heat exchanger (31) bypasses the heating tank (34) and flows into the water pump (36). At this time, the second flow switching unit 38 maintains a state in which the indoor unit piping 30 connected to the water-refrigerant heat exchanger 31 is in communication with the bypass piping 37.

Therefore, the water passing through the indoor unit (3) is heated only by heat exchange with the refrigerant in the water-refrigerant heat exchanger (31).

On the other hand, referring to FIG. 5, there is a case in which the water is not enough to perform heating or hot water only by the heat amount obtained by the water through heat exchange with the refrigerant in the water-refrigerant heat exchanger 31. In this case, the water discharged from the water refrigerant heat exchanger (31) passes through the heating tank (34) and flows into the water pump (36). At this time, the second flow switching unit 38 connects the indoor unit piping 30 connected to the water-refrigerant heat exchanger 31 to the indoor unit piping 30 connected to the heating tank 34 . In order to heat the water passing through the heating tank 34, the heating heater 35 is operated.

Therefore, the water passing through the indoor unit 3 is heated together with the heaters 35 as well as heat exchange with the refrigerant in the water-refrigerant heat exchanger 31. Therefore, the amount of heat that is insufficient to perform the heating or hot water supply can be supplemented by the heating heater 35. [

Hereinafter, a control method of an embodiment of a water circulation system linked to a refrigerant cycle according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 is a control block diagram showing a control signal flow of an embodiment of a water circulation system linked to a refrigerant cycle according to the present invention, and FIG. 7 is a flowchart showing a control method of an embodiment of a water circulation system interlocked with a refrigerant cycle according to the present invention.

Referring to FIG. 6, the system 1 includes an input unit 71 for inputting a signal for controlling operation of the system 1 by a user, an outdoor temperature sensing unit An outflow temperature sensing unit 73 for sensing the temperature of the water discharged from the indoor unit, that is, the temperature of the outflow, and a controller 70 for controlling the temperature of the indoor unit 71, the outdoor temperature sensing unit 72 and the outflow temperature sensing unit 73, And a control unit (75) for controlling the second flow switching unit (38) according to a transmitted signal. At this time, the input unit 71, the outdoor temperature sensing unit 72, the outflow temperature sensing unit 73, the control unit 75 and the second flow switching unit 38 are electrically connected to each other so as to exchange control signals .

The outdoor temperature sensing unit 72 may be installed at a location where the temperature of the outdoor air can be sensed, such as the outdoor unit 2. The outflow temperature sensing unit 73 may be installed at a point where the temperature of the outflow can be sensed, for example, at one point on the water pipe corresponding to the discharge side of the water pump 36.

Referring to FIG. 7, when the operation of the system 1 is started, the outdoor temperature and the outflow temperature are first sensed (S11). At this time, the system 1 may be operated for heating or hot water supply.

Then, the outdoor temperature is compared with the first reference temperature, and the difference between the outgoing water temperature and the target temperature is compared with the second reference temperature (S12). At this time, the first reference temperature, the target temperature, and the second reference temperature may be set in advance for normal operation of the system 1. For example, the first reference temperature may be the upper limit of the outdoor temperature that is insufficient to perform heating or hot water only by heat exchange with the refrigerant in the heat pump, that is, the water-refrigerant heat exchanger (31). The target temperature may be an outflow temperature desired by the user to perform the heating or hot water supply. The second reference temperature may be the lower limit of the difference between the target temperature and the outflow temperature that is insufficient to perform heating or hot water only by heat exchange with the refrigerant in the heat pump or the water-refrigerant heat exchanger (31).

If the outdoor temperature is not lower than the first reference temperature or the difference between the outgoing temperature and the target temperature is not equal to or higher than the second reference temperature (S12), the outdoor temperature and the outflow temperature are sensed again (S11).

However, when the outdoor temperature is equal to or lower than the first reference temperature and the difference between the outgoing water temperature and the target temperature is equal to or higher than the second reference temperature (S12), the refrigerant passes through the heating tank 34 The flow direction of the refrigerant is switched by the flow switching unit (S13). That is, the flow switching unit maintains a state in which the refrigerant is guided to pass through the heating tank 34. Here, the heating heater 35 is activated, and the water passing through the heating tank 34 is heated.

Then, the outdoor temperature and the outflow temperature are sensed (S14). Next, the outdoor temperature is compared with the first reference temperature, and the difference between the outgoing temperature and the target temperature is compared with the second reference temperature (S15).

As long as the outdoor temperature is equal to or lower than the first reference temperature and the difference between the outgoing temperature and the target temperature is equal to or higher than the second reference temperature (S15), the outdoor temperature and the outflow temperature are continuously sensed (S14).

When the outdoor temperature exceeds the first reference temperature or the difference between the outgoing temperature and the target temperature is less than the second reference temperature (S15), the refrigerant is returned to the heating tank (34) The flow direction of the refrigerant by the flow switching unit is switched (S16). That is, the flow switching unit maintains a state in which the refrigerant is guided to bypass the heating tank (34). Here, the operation of the heating heater 35 is stopped.

Until a signal for termination of the operation of the system 1 is input, the above process can be repeatedly performed (S17).

According to the system (1), there is an advantage that the flow resistance of the water can be minimized when heating by the heater (35) is not required. More specifically, when the outdoor temperature exceeds the first reference temperature, or the difference between the outgoing water temperature and the target temperature is less than the second reference temperature, the water flows by bypassing the heating tank 34. That is, when the heat pump or the water-refrigerant heat exchanger (31) only performs heat and hot water operation by heat exchange between water and refrigerant, the water flows by bypassing the heating tank (34). Therefore, the flow resistance, that is, the pressure loss that can be generated due to the water unnecessarily passing through the heating tank 34 can be minimized.

Further, according to the system 1, the heating heater 35 and the heating tank 34 can be selectively used depending on necessity. More specifically, when the outdoor temperature is equal to or lower than the first reference temperature and the difference between the outgoing water temperature and the target temperature is equal to or higher than the second reference temperature, the water passes through the heating tank 34 . That is, when the amount of heat obtained from the heat pump or the water-refrigerant heat exchanger 31 through heat exchange with the refrigerant is insufficient to perform heating and hot water, the water passes through the heating tank 34 do. The water is heated by the heating heater 35 in the process of passing through the heating tank 34. In the opposite case, the water bypasses the heating tank 34. Therefore, depending on whether the heating heater 35 and the heating tank 34 are required, the heating heater 35 and the heating tank 34 can be selectively used.

It will be apparent to those skilled in the art that many other modifications and variations are possible in light of the above teachings and the scope of the present invention should be construed on the basis of the appended claims will be.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of an embodiment of a water circulation system linked to a refrigerant cycle according to the present invention; Fig.

2 is a view showing a refrigerant flow in a case where room heating is performed in the embodiment of the water circulation system linked with the refrigerant cycle according to the present invention.

3 is a view showing a refrigerant flow in the case where hot water supply is performed in the embodiment of the water circulation system linked with the refrigerant cycle according to the present invention.

4 is a view showing a water flow when water is bypassing a heating tank in an indoor unit of an embodiment of a water circulation system linked to a refrigerant cycle according to the present invention.

5 is a view showing water flow when water flows through a heating tank in an indoor unit of an embodiment of a water circulation system linked with a refrigerant cycle according to the present invention.

6 is a control block diagram showing a control signal flow in an embodiment of a water circulation system linked to a refrigerant cycle according to the present invention.

7 is a flowchart showing a control method of an embodiment of a water circulation system linked to a refrigerant cycle according to the present invention.

Claims (12)

An outdoor heat exchanger for exchanging heat between a refrigerant and outdoor air, and a compressor for compressing the refrigerant; A water heat exchanger for exchanging heat between the refrigerant and the working fluid, a heating tank for collecting the working fluid that has passed through the water-refrigerant heat exchanger and for heating the working fluid, and a heater installed at one side of the heating tank, An indoor unit including a water pump; An indoor unit piping provided inside the indoor unit for connecting the water refrigerant heat exchanger, the heating tank, and the water pump; A heating unit capable of flowing a working fluid heated in the heating tank for indoor heating; A hot water supply unit having a water heater for heating the water, a working fluid heated in the heating tank to supply hot water, an outflow unit for supplying water externally heat-exchanged with the working fluid, and a heater for heating the water; And And a bypass pipe extending from the inlet-side indoor unit pipe of the heating tank to the outlet-side indoor unit pipe of the heating tank so that the working fluid bypasses the heating tank and can be supplied to the heating unit or the hot water supply unit Water circulation system connected with refrigerant cycle. The method according to claim 1, One end of the bypass pipe is connected to the corresponding indoor unit pipe between the water-refrigerant heat exchanger and the heating tank, and the other end of the bypass pipe is connected to the corresponding indoor unit pipe between the heating tank and the water pump Water circulation system connected with refrigerant cycle. The method according to claim 1, Further comprising a flow switching unit for switching the flow direction of the working fluid so that the working fluid passes through or bypasses the heating tank. The method of claim 3, An outdoor temperature sensing unit for sensing a temperature of the outdoor air; And And an outflow temperature sensing unit for sensing a temperature of outflow from the indoor unit. 5. The method of claim 4, When the outdoor temperature is equal to or lower than the first reference temperature and the difference between the outgoing temperature and the target temperature is equal to or higher than the second reference temperature, the flow switching unit guides the working fluid to pass through the heating tank Features a refrigerant cycle interlocked water circulation system. 5. The method of claim 4, The flow switching unit guides the working fluid to bypass the heating tank when the outdoor temperature exceeds the first reference temperature or the difference between the outgoing temperature and the target temperature is less than the second reference temperature Water circulation system linked with refrigerant cycle. 5. The method of claim 4, Further comprising a heater disposed at one side of the heating tank to heat the working fluid of the heating tank. 8. The method of claim 7, Characterized in that the heating heater of the heating tank is operated when the outdoor temperature is equal to or lower than the first reference temperature and the difference between the outgoing temperature and the target temperature is equal to or higher than the second reference temperature Circulation system. 8. The method of claim 7, Characterized in that the heating heater of the heating tank is stopped when the outdoor temperature exceeds the first reference temperature or the difference between the outgoing temperature and the target temperature is less than the second reference temperature Water circulation system. Driving the water pump to allow the working fluid to pass through the water-refrigerant heat exchanger; An outdoor temperature and an outflow temperature are detected; Comparing the outdoor temperature and the outflow temperature with a reference temperature; And The operation fluid that has passed through the water-refrigerant heat exchanger passes through the heating tank or bypasses the heating tank and is supplied to the hot water supply unit or the heating unit according to a result of comparing the outdoor temperature and the outflow temperature with the reference temperature, Wherein the flow direction of the working fluid is switched by the flow of the working fluid, Wherein the hot water supply unit includes an outlet for supplying water externally heat-exchanged with the working fluid and a heater for heating the water, Wherein the heating tank is provided at an outlet side of the water refrigerant heat exchanger and collects the working fluid that has passed through the water refrigerant heat exchanger and a heater for heating the collected working fluid. Method of controlling the system. 11. The method of claim 10, When the outdoor temperature is equal to or lower than the first reference temperature and the difference between the outgoing temperature and the target temperature is equal to or higher than the second reference temperature, And the flow directions of the refrigerant are switched. 11. The method of claim 10, Wherein when the outdoor temperature exceeds the first reference temperature or the difference between the outgoing water temperature and the target temperature is less than the second reference temperature, the flow of the working fluid by the flow switching unit such that the working fluid bypasses the heating tank And the direction of the refrigerant cycle is switched.

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