KR20110079053A - Water circulation system associated with refrigerant cycle - Google Patents

Abstract

PURPOSE: A water circulation system linked with a refrigerant cycle is provided to optimize operating efficiency regardless of the external circumferences and the state variation in the target of operation. CONSTITUTION: A water circulation system(S) linked with a refrigerant cycle comprises: a first refrigerant circulation unit(1) for performing a refrigerant cycle including an outdoor heat exchanger(13) to transfer heat between a first refrigerant and the outdoor air and a first compressor(11) to compress a refrigerant; a second refrigerant circulation unit(2) for performing a refrigerant cycle including a refrigerant heat exchanger(25) to transfer heat between a refrigerant and the second refrigerant and a second compressor(21) to compress the second refrigerant; and a water circulation unit transferring heat between water moving for air conditioning, heating and supplying hot water to the indoor and the second refrigerant.

Description

Water circulation system associated with refrigerant cycle

The present invention relates to an indoor unit of a water circulation system that performs a hot water supply and cooling and heating function in conjunction with a refrigerant cycle.

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

In more detail, the air conditioner includes an outdoor unit installed outdoors and an indoor unit installed indoors. The outdoor unit includes a compressor for compressing a refrigerant, an outdoor heat exchanger for heat exchange between the refrigerant and outdoor air, and a pressure reducing device for expanding the refrigerant, and the indoor unit includes an indoor heat exchanger for heat exchange between the refrigerant and indoor air. At this time, any one of the outdoor heat exchanger and the indoor heat exchanger acts as a condenser and the other as an evaporator, so that the compressor, outdoor heat exchanger, pressure reducing device, and indoor heat exchanger perform a refrigerant cycle.

The boiler generates heat using oil, gas, or electricity to heat the water to supply hot water or perform floor heating.

The present invention is to provide a refrigerant cycle interlocking water circulation system that can improve the operating efficiency.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

Embodiment of the refrigerant cycle interlocking water circulation system according to the present invention proposed as described above, the outdoor heat exchanger is a heat exchange between the first refrigerant and the outdoor air in order to perform the refrigerant cycle, A first refrigerant circulation unit including a first compressor; A second refrigerant circulation unit including a refrigerant heat exchanger configured to exchange heat between the second refrigerant and the first refrigerant, and a second compressor configured to compress the second refrigerant to perform a refrigerant cycle; And a water circulation unit in which water flowing for at least one of air conditioning and hot water supply in the room exchanges heat with the second refrigerant, wherein the compression ratio of the refrigerant by the first compressor is a compression ratio of the refrigerant by the second compressor. To be equal to, characterized in that the operating ratio of the first compressor is variable.

As described above, according to the refrigerant cycle interlocking water circulation system according to the present invention, there is an advantage that the operation efficiency can be optimized regardless of the change of the external environment and the state of the operation target. In more detail, the operation ratio of the low stage compressor is adjusted in a direction in which the compression ratio by the high stage compressor is equal to the compression ratio by the low stage compressor, regardless of the outdoor air temperature and the water extraction temperature. When the compression ratio by the high stage compressor is equal to the compression ratio by the low stage compressor, the operation efficiency of the refrigerant cycle linked water circulation system may be maximized. Therefore, the operating efficiency of the refrigerant cycle linked water circulation system can be further improved.

Hereinafter, a refrigerant cycle interlocking water circulation system according to the present invention will be described in more detail with reference to the accompanying drawings.

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

Referring to FIG. 1, the refrigerant cycle interlocking water circulation system S may include a first refrigerant circulation unit in which a first refrigerant that exchanges heat with outdoor air flows to perform a refrigerant cycle, and a second refrigerant that exchanges heat with the first refrigerant. The refrigerant includes a second refrigerant circulation unit that flows to perform a refrigerant cycle, and a water circulation unit in which water for at least one of indoor heating and cooling and hot water flows. In this case, the refrigerant cycle means that the refrigerant transfers heat by repeatedly performing a compression-condensation-expansion-evaporation process.

The refrigerant cycle interlocking water circulation system S includes an outdoor unit 1 in which an outdoor heat exchanger 13 for exchanging heat between the first refrigerant and outdoor air is installed, and the outdoor unit 1 includes the water circulation unit. And a repeater 2 including a water refrigerant heat exchanger 23 through which the second refrigerant and water are heat exchanged.

In detail, the first refrigerant circulation unit includes: the outdoor heat exchanger (13), a first compressor (11) for compressing the first refrigerant, a first expansion unit (14) for expanding the first refrigerant, and A first flow switching unit 12 for switching the flow direction of the first refrigerant, a refrigerant heat exchanger 25 for exchanging heat between the first refrigerant and the second refrigerant, and a first refrigerant pipe through which the first refrigerant flows. 15, and an outdoor fan 131 (see FIG. 6) for forcibly flowing the outdoor air toward the outdoor heat exchanger (13). That is, the first refrigerant is any one of the first compressor 11, the outdoor heat exchanger 13, and the refrigerant heat exchanger 25, the first expansion unit 14, and the outdoor heat exchanger 13. And a refrigerant cycle while sequentially circulating the other one of the refrigerant heat exchangers 25. In addition, by the first flow switching unit 12, the flow direction of the first refrigerant passes through the first expansion unit 14 from the refrigerant heat exchanger 25 and then to the outdoor heat exchanger 13. It can be reversed in the incoming direction or in the reverse direction.

The second refrigerant circulation unit includes the refrigerant heat exchanger 25, a second compressor 21 for compressing the second refrigerant, a second expansion unit 24 for expanding the second refrigerant, and A second flow switching unit 22 for switching the flow direction of the second refrigerant, the water refrigerant heat exchanger 23, and the second refrigerant pipe 26 through which the second refrigerant flows. That is, the second refrigerant is any one of the second compressor 21, the refrigerant heat exchanger 25, and the water refrigerant heat exchanger 23, the second expansion part 24, and the refrigerant heat exchanger 25. And the other one of the water refrigerant heat exchanger (23) sequentially performs a refrigerant cycle. In addition, by the second flow switching unit 22, the flow direction of the second refrigerant passes through the second expansion unit 24 from the water refrigerant heat exchanger 23 and then the refrigerant heat exchanger 25. It can be switched in the direction or the reverse flow into.

That is, the refrigerant heat exchanger 25 is the first refrigerant and the second refrigerant to pass at the same time, on the one hand is included in the first refrigerant circulation portion and on the other hand is included in the second refrigerant circulation portion. In the refrigerant heat exchanger 25, at least two flow paths through which the first refrigerant and the second refrigerant can flow independently are formed. The refrigerant heat exchanger 25 may be, for example, a plate heat exchanger.

Here, the refrigerant discharged from the first compressor 11 has a pressure lower than the refrigerant discharged from the second compressor 21. On the contrary, the refrigerant discharged from the second compressor 21 has a relatively higher pressure than the refrigerant discharged from the first compressor 11. Accordingly, the first refrigerant circulation unit may be referred to as a low stage refrigerant circulation unit, and the second refrigerant circulation unit may be referred to as a high stage refrigerant cooling unit. In addition, the first compressor 11 may be referred to as a low stage compressor, and the second compressor 21 may be referred to as a high stage compressor.

In addition, since the pressure of the refrigerant flowing into the compressors 11 and 21 in the refrigerant circulation units 1 and 2 is relatively lower than the pressure of the refrigerant discharged from the compressors 11 and 21, the compressor 11 The pressure of the refrigerant flowing into the 21 may be referred to as low pressure. On the contrary, since the pressure of the refrigerant discharged from the compressors 11 and 21 is relatively higher than the pressure of the refrigerant flowing into the compressors 11 and 21, the pressure of the refrigerant discharged from the compressors 11 and 21 is increased. This can be called.

Therefore, the pressure of the refrigerant discharged from the first compressor may be referred to as low stage high pressure, and the pressure of the refrigerant discharged from the second compressor may be referred to as high stage side high pressure. The pressure of the refrigerant flowing into the first compressor may be referred to as low stage low pressure, and the pressure of the refrigerant flowing into the second compressor may be referred to as high stage low pressure.

Meanwhile, the outdoor heat exchanger 13, the first compressor 11, the first expansion unit 14, and the first flow switching unit 12 are installed in the outdoor unit 1. When the outdoor unit 1 is operated in the cooling mode, the outdoor heat exchanger 13 performs the function of the condenser, and when the outdoor unit 1 is operated in the heating mode, the outdoor unit 1 performs the function of the evaporator.

The refrigerant heat exchanger 25, the water refrigerant heat exchanger 23, the second compressor 21, and the second flow switching unit 22 are installed in the repeater 2. In addition, the repeater (2) is mounted on the water refrigerant exchanger (23) and the water pipe (61) extending on the outlet side of the water refrigerant exchanger (23), the flow switch for detecting the flow of water ( 32, a flow switch, an expansion tank 33 branched at a point spaced apart from the flow switch 32 in the flow direction of water, and extending from an outlet side of the water refrigerant exchanger 23; An end portion of the water pipe 61 to be inserted is inserted into the water collecting tank 34 provided with an auxiliary heater 35 therein, and the water provided at any point of the outlet water pipe 61 of the water collecting tank 34. A pump 36 (water pump) is installed.

In more detail, the water refrigerant heat exchanger (23) is a device for heat exchange between the refrigerant flowing along the refrigerant cycle closed circuit and the water flowing along the water pipe (61), for example, a plate heat exchanger may be applied. At least two flow paths 251 and 252 are formed in the water refrigerant heat exchanger 23 to exchange heat with each other while the refrigerant and water flow independently.

In addition, the expansion tank 33, while passing through the water refrigerant exchanger 23 performs a buffer function that absorbs the volume of the heated water when it is expanded to an appropriate level or more.

In addition, the collection tank 34 is a container in which water passing through the water refrigerant exchanger 23 is collected. In addition, an auxiliary heater 35 is mounted inside the collecting tank 34 to selectively operate when the amount of heat transferred through the water refrigerant exchanger 23 does not reach the required amount of heat, such as when a defrosting operation is performed. Done.

In addition, an air vent 343 is formed at an upper side of the collecting tank 34 to discharge the superheated air present in the collecting tank 34. In addition, a pressure gauge 341 and a relief valve 342 may be provided at one side of the collecting tank 34 so that the pressure inside the collecting tank 34 may be appropriately adjusted. For example, when the water pressure inside the collection tank 34 displayed through the pressure gauge 341 is excessively high, the relief valve 342 may be opened so that the pressure in the tank may be properly adjusted.

In addition, the water pump 36 pumps the water discharged through the water pipe 61 extending from the outlet side of the collecting tank 34 so as to be supplied to the hot water supply unit 4 and the heating and cooling unit 5. do.

On the other hand, the water circulation unit, the hot water supply, that is, the hot water supply unit 4 for the flow of water for hot water supply, and the cooling and heating unit 5 for the water for cooling and cooling the room flows.

In more detail, the hot water supply unit 4 is a part for warming and supplying water required for a work such as washing or washing dishes. In detail, at a point spaced apart from the water pump 36 in the direction of water flow, a three-way valve 65 is provided to control the flow of water. The three-way valve 65 is a directional valve for allowing the water pumped by the water pump 36 to flow into the hot water supply unit 4 or the air-conditioning unit 5. Accordingly, the hot water supply pipe 62 extending to the hot water supply unit 4 and the air conditioning heating pipe 63 extending to the air conditioning unit 5 are connected to the outlet side of the three-way valve 65. In addition, the water pumped by the water pump 36 is selectively flowed to either the hot water supply pipe 62 or the air conditioning pipe 63 under the control of the three-way valve 65.

The hot water supply unit 4 includes a hot water tank 41 for storing water supplied from the outside and allowing the stored water to be heated, and an auxiliary heater 42 provided inside the hot water tank 41. In addition, one side of the hot water supply unit 4 is provided with an inlet 411 for the introduction of cold water, and a water outlet 412 for discharging the heated water.

In detail, a part of the hot water supply pipe 62 extending from the three-way valve 65 is introduced 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 supply pipe 62 to the water stored in the hot water tank 41. And, in certain cases, the auxiliary heater 35 and the auxiliary heat source may operate to supply additional heat. For example, it may operate when the water needs to be heated in a short time, such as when the user needs a lot of hot water to take a bath. According to an embodiment, the water outlet 412 may be connected to a hot water dispensing device such as a shower or a home appliance such as a humidifier.

On the other hand, in the air-conditioning unit 5, a part of the floor air-conditioning unit 51 formed by embedding a part of the air-conditioning pipe 63 is embedded in the indoor floor, and branched from any point of the air-conditioning pipe 63 and the floor air-conditioning unit Air cooling and heating unit 52 connected in parallel with the 51 is included.

In detail, the floor heating and cooling unit 51 may be buried in the form of a meander line (meander line) on the indoor floor as shown. In addition, the air-conditioning unit 52 may be a fan coil unit or a radiator. In addition, a part of the air-conditioning pipe 54 branched from the air-conditioning pipe 63 is provided to the air-conditioning unit 52 as a heat exchange means. At the point where the air cooling and heating pipe 54 is branched, a flow path switching valve 56 such as a three-way valve 65 is installed, and the refrigerant flowing along the cooling and heating pipe 63 is connected to the bottom heating and heating unit 51. It may be divided into the air-cooling and heating unit 52 or flow to either side.

In addition, an end portion of the hot water supply pipe 62 extending from the three-way valve 65 is laminated at a point spaced apart from the outlet end of the air cooling and 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 62 is introduced back into the water cooling heat exchanger 23 after being combined with the air conditioning pipe 63 again.

Here, the check valve (V) may be installed at a point requiring a back flow block, such as a point where the hot water supply pipe 62 is joined with the air-conditioning pipe 63, to prevent the back flow of water. In the same context, in addition to the method of installing the flow path switching valve 56, the check valve may be installed at the outlet end of the air-conditioning pipe 54 and the outlet end of the bottom air-conditioning unit 51, respectively.

Hereinafter, with reference to the accompanying drawings the refrigerant flow in the first embodiment of the refrigerant cycle interlocking water circulation system according to the present invention will be described in detail.

Referring to FIG. 1, a description will now be given of a refrigerant flow when the refrigerant cycle linked water circulation system S operates in a heating mode. In the first refrigerant circulation unit, the first refrigerant discharged from the first compressor 11 sequentially moves the refrigerant heat exchanger 25, the first expansion unit 14, and the outdoor heat exchanger 13. Pass through the refrigerant cycle. At this time, the first flow switching unit 12 maintains a state of guiding the refrigerant discharged from the first compressor 11 to the refrigerant heat exchanger 25.

In the second refrigerant circulation unit, the second refrigerant discharged from the second compressor 21 includes the water refrigerant heat exchanger 23, the second expansion unit 24, and the refrigerant heat exchanger 25. The refrigerant cycle is carried out while passing through). At this time, the second flow switching unit 22 maintains a state of guiding the refrigerant discharged from the second compressor 21 to the water refrigerant heat exchanger 23. The second refrigerant absorbs heat from the first refrigerant in the process of passing through the refrigerant heat exchanger 25.

In the water circulation unit, water absorbed heat from the second refrigerant in the water refrigerant exchanger 23 passes through the water collecting tank 34 and the water pump 36 to heat the cooling and heating unit. Flows into (5). At this time, the three-way valve 65 maintains a state of guiding the water discharged from the water pump 36 to the cooling and heating unit (5). The water introduced into the air conditioning unit 5 passes through the air cooling unit 52 and the bottom air conditioning unit 51 to perform indoor heating, and then flows into the water refrigerant exchanger 23 again.

Next, when the refrigerant cycle interlocking water circulation system S operates in a cooling mode, the first refrigerant and the second refrigerant are operated in the heating mode in the first refrigerant circulation unit and the second refrigerant circulation unit. Flow in reverse order compared to the case. And, in the water circulation, the flow of water is the same as when operating in the heating mode.

When the refrigerant cycle interlocking water circulation system S operates in the hot water supply mode, the flow of the first refrigerant and the second refrigerant in the first refrigerant circulation unit and the second refrigerant circulation unit operates in the heating mode. Same as if. In addition, in the water circulation unit, water discharged from the water pump 36 flows into the hot water supply unit 4. The water introduced into the hot water supply unit 4 heats the water stored in the hot water tank 41 in the process of passing through the hot water tank 41, and then flows into the water refrigerant exchanger 23 again.

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

2 is a control block diagram of a first embodiment of a refrigerant cycle interlocking water circulation system according to the present invention, and FIG. 3 is a flowchart showing a control flow of a first embodiment of the refrigerant cycle interlocking water circulation system according to the present invention.

Referring to FIG. 2, the refrigerant cycle interlocking water circulation system S includes a high stage low pressure detecting unit 71 that detects a pressure of the second refrigerant flowing into the second compressor 21, that is, a high stage low pressure. , The high stage side high pressure detecting unit 72 for sensing the pressure of the second refrigerant discharged from the second compressor 21, that is, the high stage side high pressure, and the pressure of the first refrigerant discharged from the first compressor 11. A low stage side high pressure sensing unit 73 sensing low stage side high pressure, a low stage side low pressure sensing unit 74 sensing a pressure of a first refrigerant flowing into the first compressor 11, that is, a low stage side low pressure; A controller 75 for controlling the high stage compressor 21 and the low stage compressor 11 based on the high stage low pressure, the high stage side high pressure, the low stage side high pressure, and the low stage side low pressure; The memory unit 76 further stores a variety of information for the operation of S).

The high stage low pressure detecting unit 71, the high stage high pressure detecting unit 72, the low stage high pressure detecting unit 73, the low stage low pressure detecting unit 74, the control unit 75, the high stage compressor 21 and the low stage The side compressor 11 is electrically connected to send and receive a control signal.

Referring to Figure 3, when the operation of the refrigerant cycle linked water circulation system (S) is started, the operation of the high and low stage compressor 11 is started (S11). Then, the high stage side high pressure and low pressure and the low stage side high pressure and low pressure are sensed (S12).

Next, it is determined whether the ratio of the high end side compression ratio to the low end side compression ratio exceeds the reference ratio (S13). Here, the low stage side compression ratio means the ratio of the low stage side high pressure to the low stage side low pressure, and the high stage side compression ratio means the ratio of the high stage side high pressure to the high stage side low pressure. In addition, the reference ratio refers to a ratio between the low end side compression ratio and the high end side compression ratio in which the operating efficiency of the refrigerant cycle interlocking water circulation system S may be optimized. That is, when the reference ratio is 1, the operating efficiency of the refrigerant cycle linked water circulation system (S) can be optimized.

When the ratio of the high stage side compression ratio to the low stage side compression ratio exceeds the reference ratio, the operation rate of the low stage side compressor 11 is reduced (S14). However, when the ratio of the high end side compression ratio to the low end side compression ratio does not exceed the reference ratio, it is determined whether the ratio of the high end side compression ratio to the low end side compression ratio is less than the reference ratio (S15). .

When the ratio of the high stage side compression ratio to the low stage side compression ratio is less than the reference ratio, the operation rate of the low stage side compressor 11 is increased (S16). However, when the ratio of the high end side compression ratio to the low end side compression ratio is equal to the reference ratio, the high end side high pressure and low pressure and the low end side high pressure and low pressure are detected again (S11).

Further, even after the operation rate of the low stage compressor 11 is varied, unless the signal for stopping the operation of the refrigerant cycle linked water circulation system (S) is not input (S17), the high stage side high pressure and low pressure again. And it repeats from the step of detecting the low stage high pressure and low pressure (S11). That is, the control of the compressor for optimizing the operating efficiency of the refrigerant cycle linked water circulation system (S) is continuously performed.

On the other hand, at this time, the high stage compressor 21 is, for example, based on the state of the object that is the operation purpose of the refrigerant cycle linked water circulation system (S), such as the temperature of the water discharged from the repeater (2). Can be controlled.

According to the refrigerant cycle linked water circulation system (S), there is an advantage that the operating efficiency can be optimized regardless of the change of the state of the external environment and the operation target. The external environment may be, for example, the temperature of the outdoor air, and the state of the operation target may be, for example, the temperature of the water discharged from the repeater 2.

In more detail, during operation of the refrigerant cycle linked water circulation system S, at least one of the temperature of the outdoor air and the temperature of the water discharged from the repeater 2 may be changed. Then, at least one of the amount of heat absorbed by the first refrigerant through the outdoor heat exchanger 13 and the amount of heat transferred from the second refrigerant to the water through the water refrigerant exchanger 23 is changed. The pressure is also changed according to the temperature change of the first and second refrigerants, and the operating states of the first and second refrigerant circulation portions are changed as a whole.

In this case, based on the temperature of the water withdrawn from the repeater 2, the operation rate of the high stage compressor 21 is adjusted so that the temperature of the water can reach a temperature suitable for the operation purpose. The refrigerant cycle linked water circulation system S continuously detects the high stage low pressure and the high pressure and the low stage low pressure and the high pressure, such that the high stage compression ratio and the low stage compression ratio have the same value. The operation rate of the compressor 11 is adjusted. That is, the operation ratio of the low stage compressor 11 is adjusted so that the ratio of the high stage compression ratio to the low stage compression ratio becomes one.

At this time, when the ratio of the low end side compression ratio and the high end side compression ratio becomes 1, that is, when the low end side compression ratio and the high end side compression ratio become equal, the operation efficiency of the refrigerant cycle interlocking water circulation system S is maximum. Can be Therefore, the refrigerant cycle interlocking water circulation system (S) can be operated to optimize the operation efficiency, regardless of the external environment or the change of the state of the object to be operated.

Hereinafter, a second embodiment of a refrigerant cycle linked water circulation system according to the present invention will be described in detail with reference to the accompanying drawings. This embodiment differs from the first embodiment in that the compressor is controlled by sensing the temperature of outdoor air and the temperature of water.

4 is a control block diagram of a second embodiment of a refrigerant cycle interlocking water circulation system according to the present invention, and FIG. 5 is a flowchart showing a control flow of a second embodiment of the refrigerant cycle interlocking water circulation system according to the present invention.

Referring to FIG. 4, the present exemplary embodiment includes a high stage high pressure detecting unit 81 for detecting high stage high pressure, a low stage high pressure detecting unit 82 for detecting low stage high pressure, and an outdoor air temperature. The outdoor temperature sensor 83 for sensing, the water temperature detector 84 for detecting the temperature of the water discharged from the repeater 2, the high stage high pressure, low stage high pressure, the temperature of the outdoor air, the water temperature A control unit 85 for controlling the high stage compressor 21 and the low stage compressor 11 and a memory unit 86 storing various information for operating the refrigerant cycle linked water circulation system S based on the control unit 85. It further includes.

Referring to FIG. 5, in the present embodiment, when the refrigerant cycle linked water circulation system S is started, the high stage compressor 21 and the low stage compressor 11 are started (S21). Then, the temperature of the outdoor air and the temperature of the water are sensed (S22).

Next, the low stage target high pressure corresponding to the temperature of the outdoor air and the temperature of the water is calculated (S23). In this case, the low stage side target high pressure means the low stage side high pressure value for operating the refrigerant cycle linked water circulation system S at an optimum efficiency. That is, the low stage side target high pressure may correspond to the low stage side high pressure value in a state where the refrigerant cycle linked water circulation system S is operated such that the high stage side compression ratio and the low stage side compression ratio are the same.

The low stage target high pressure corresponding to the outdoor air temperature and the water temperature may be calculated by a relation between the outdoor air temperature and the water temperature and the low stage target high pressure, or correspond to the outdoor air temperature and the water temperature. The low stage side target high pressure may be stored in a table, and the low stage side target high pressure may be determined from the table.

At this time, the relationship information between the temperature of the outdoor air and the water temperature, and the target high pressure for the compression ratio of the low stage compressor 11 and the compression ratio of the high stage compressor 21 to be the same, the memory unit 86 Can be stored in advance. The relationship information may correspond to a table of a relationship between the temperature of the outdoor air and the water temperature and the low end target high pressure, and the table between the low end target high pressure corresponding to the temperature of the outdoor air and the water temperature.

Next, the low stage high pressure corresponding to the pressure of the refrigerant discharged from the low stage compressor 11 is sensed (S24). Then, it is determined whether the low stage high pressure is greater than the low stage target high pressure (S25). When the low stage high pressure is greater than the low stage target high pressure, the operation rate of the low stage compressor 11 is reduced (S26). When the operation rate of the low stage compressor 11 is reduced, the low stage high pressure may be naturally reduced.

However, when the low stage high pressure is not greater than the low stage target high pressure (S25), it is determined whether the low stage side high pressure is smaller than the low stage side high pressure (S27). When the low stage high pressure is smaller than the low stage target high pressure, the operation rate of the low stage compressor 11 is increased (S28). When the operation rate of the low stage compressor 11 is increased, the low stage high pressure may be naturally increased.

On the other hand, after the low stage high pressure is the same as the low stage side target high pressure, or after the operation rate of the low stage side compressor 11 is adjusted, a signal for stopping the operation of the refrigerant cycle linked water circulation system (S) is As long as it is not input (S29), it repeats from the step of detecting the temperature of the outdoor air and the temperature of the water again (S22).

According to the present embodiment, there is an advantage in that the number of pressure sensing units for sensing pressures of the first and second refrigerants can be reduced. In more detail, the refrigerant cycle interlocking water circulation system S generally includes an outdoor temperature sensor 83 for detecting a temperature of the outdoor air, and a water temperature for detecting a temperature of water discharged from the repeater 2. The detector 84 is basically installed. This is because the temperature of the outdoor air is essential information for determining whether to defrost during heating operation, and the temperature of the water corresponds to information necessary for heating and cooling of the room and hot water supply.

By the way, in the present embodiment, using the outdoor temperature detection unit 83 and the water temperature detection unit 84 which is basically installed, the high-end side high pressure detection unit 81 for detecting the high-end side high pressure and low-side side high pressure. And the low stage high pressure detecting unit 82, that is, only two pressure detecting units are additionally installed. Therefore, there is an advantage in that the number of pressure sensing units required to operate the refrigerant cycle interlocking water circulation system S can achieve optimal operation efficiency.

Hereinafter, a control method of a third embodiment of a refrigerant cycle interlocking water circulation system according to the present invention will be described in detail with reference to the accompanying drawings. This embodiment is different from the first embodiment in that the compressor is controlled by detecting the temperature of the outdoor air, the water temperature, the operation rates of the high stage compressor and the low stage compressor.

6 is a control block diagram of a third embodiment of a refrigerant cycle interlocking water circulation system according to the present invention, and FIG. 7 is a flowchart illustrating a control flow of a third embodiment of the refrigerant cycle interlocking water circulation system according to the present invention.

Referring to FIG. 6, the present embodiment includes an outdoor temperature detector 91 for detecting a temperature of outdoor air, a water temperature detector 92 for detecting a temperature of water discharged from a repeater, and a high stage compressor. High stage compressor operation rate detection unit 93 for detecting the operation rate of the 21, low stage compressor operation rate detection unit 94 for detecting the operation rate of the low stage compressor 11, and the outdoor air And a control unit 95 for controlling the high stage compressor 21 and the low stage compressor 11 based on the temperature of the water, the temperature of the water, the operation rate of the high stage compressor 21, and the operation rate of the low stage compressor 11. The memory unit 96 stores various kinds of information for operating the refrigerant cycle interlocking water circulation system.

At this time, the high stage compressor operation rate detection unit 93 and the low stage compressor operation rate detection unit 94, the method of directly detecting the number of revolutions per hour of the high stage compressor 21 and the low stage compressor (11) Alternatively, the operation rate may be indirectly sensed through a current or voltage applied to the high stage compressor 21 and the low stage compressor 11.

Referring to FIG. 5, in the present embodiment, when the refrigerant cycle interlocking water circulation system S is started, the high stage compressor 21 and the low stage compressor 11 are started. Then, the temperature of the outdoor air and the temperature of the water are sensed.

Next, a target operation rate difference between the high stage and the low stage corresponding to the temperature of the outdoor air and the temperature of the water is calculated. At this time, the target operation rate difference between the high stage and the low stage is determined by the operation rate of the high stage compressor 21 and the low stage compressor 11 for operating the refrigerant cycle interlocking water circulation system S at an optimum efficiency. It means the difference of operation rate. That is, the low stage target high pressure is the operation rate of the high stage compressor 21 and the low stage compressor in a state where the refrigerant cycle linked water circulation system S is operated such that the high stage side compression ratio and the low stage side compression ratio are the same. It may correspond to the difference in the driving ratio of (11).

The target operation rate difference corresponding to the temperature of the outdoor air and the water temperature is calculated by a relation between the temperature of the outdoor air and the water temperature and the target operation rate difference, or corresponds to the temperature of the outdoor air and the temperature of the water. The target driving rate difference may be stored in a table so that the target driving rate difference may be determined from the table.

At this time, the relationship information between the temperature of the outdoor air and the temperature of the water, and the target operation rate difference when the compression ratio of the low stage compressor 11 and the compression ratio of the high stage compressor 21 are the same, the memory unit 86 Can be stored in advance. The relationship information may correspond to a table between a relationship between the temperature of the outdoor air and the water temperature and the target operation rate difference, and the target operation rate difference corresponding to the temperature of the outdoor air and the water temperature.

Next, the operation rates of the high stage compressor 21 and the low stage compressor 11 are sensed. Then, it is determined whether the difference between the operation rate of the high stage compressor 21 and the operation rate of the low stage compressor 11 is greater than the target operation rate difference. When the difference between the operation rates of the high stage and low stage compressors 11 and 21 is greater than the target operation ratio difference, the operation ratio of the low stage compressor 11 is reduced. At this time, in general, since the operation rate of the low stage compressor 11 has a value greater than that of the high stage compressor 21, the operation ratio of the low stage compressor 11 is reduced, so that the high stage side naturally. And the operation rate difference of the low stage compressor (11, 21) can also be reduced.

However, when the difference between the operation rate of the high stage compressor 21 and the operation rate of the low stage compressor 11 is not greater than the target operation rate difference, the operation rate of the high stage compressor 21 and the low stage compressor It is determined whether or not the operation rate difference in (11) is smaller than the target operation rate difference. When the difference between the operation rate of the high stage compressor 21 and the operation rate of the low stage compressor 11 is smaller than the target operation rate difference, the operation rate of the low stage compressor 11 is increased. In this case, for the same reason as described above, the operation rate of the low stage compressor (11) is increased, so that the operation rate difference between the high stage and low stage compressors (11, 21) may naturally increase.

On the other hand, after the operation rate difference between the high stage compressor 21 and the low stage compressor 11 is equal to the target operation rate difference, or after the operation ratio of the low stage compressor 11 is adjusted, As long as a signal for stopping the operation of the refrigerant cycle interlocking water circulation system S is not input, the step of detecting the temperature of the outdoor air and the temperature of water again is repeated.

According to the present embodiment, there is an advantage in that a component added to optimize the operation efficiency of the refrigerant cycle interlocking water circulation system S may be minimized. In more detail, the refrigerant cycle interlocking water circulation system S generally includes an outdoor temperature detector 91 for detecting a temperature of the outdoor air, and a water temperature detector for detecting a temperature of water discharged from the repeater ( 92 is installed by default. This is because the temperature of the outdoor air is essential information for determining whether to defrost during heating operation, and the temperature of the water corresponds to information necessary for heating and cooling of the room and hot water supply.

In addition, the operation rate of the high stage side and low stage side compressors 11 may be indirectly sensed through current or voltage applied to the high stage side and low stage side compressors 11. Therefore, parts added to optimize the operation efficiency of the refrigerant cycle interlocking water circulation system (S) can be minimized.

As such, within the scope of the basic technical idea of the present invention, many other modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. something to do.

1 is a block diagram of a first embodiment of a refrigerant cycle interlocking water circulation system according to the present invention.

2 is a control block diagram of a first embodiment of a refrigerant cycle linked water circulation system according to the present invention;

Figure 3 is a flow chart showing the control flow of the first embodiment of the refrigerant cycle linked water circulation system according to the present invention.

4 is a control block diagram of a second embodiment of a refrigerant cycle linked water circulation system according to the present invention;

5 is a flowchart showing a control flow of a second embodiment of a refrigerant cycle linked water circulation system according to the present invention;

6 is a control block diagram of a third embodiment of a refrigerant cycle linked water circulation system according to the present invention;

7 is a flow chart showing a control flow of the third embodiment of the refrigerant cycle linked water circulation system according to the present invention.

Claims (15)

A first refrigerant circulation unit including an outdoor heat exchanger configured to exchange heat between a first refrigerant and outdoor air, and a first compressor configured to compress the first refrigerant to perform a refrigerant cycle; A second refrigerant circulation unit including a refrigerant heat exchanger configured to exchange heat between the second refrigerant and the first refrigerant, and a second compressor configured to compress the second refrigerant to perform a refrigerant cycle; And And a water circulation unit configured to exchange heat with the second refrigerant, wherein the water flows for at least one of heating and cooling indoors and hot water supply. And the operation ratio of the first compressor is varied so that the compression ratio of the refrigerant by the first compressor is equal to the compression ratio of the refrigerant by the second compressor. The method of claim 1, And an operating ratio of the first compressor is varied based on a ratio of the compression ratio of the first compressor and the compression ratio of the second compressor. The method of claim 2, And when the ratio of the compression ratio of the first compressor to the compression ratio of the second compressor is larger than a reference ratio, the operation rate of the first compressor is reduced. The method of claim 2, And when the ratio of the compression ratio of the first compressor to the compression ratio of the second compressor is smaller than the collimation ratio, the operation rate of the first compressor is increased. The method of claim 2, A low stage high pressure detecting unit detecting a high pressure of the first refrigerant circulation unit; A low stage side low pressure sensing unit sensing a low pressure of the first refrigerant circulation unit; A high stage high pressure detecting unit detecting a high pressure of the second refrigerant circulation unit; And Refrigerant cycle interlocking water circulation system further comprises; a high stage side low pressure detecting unit for detecting the low pressure of the second refrigerant circulation. The method of claim 1, Refrigerant cycle linked water circulation system, characterized in that the operation rate of the first compressor is variable based on the temperature of the outdoor air and the temperature of the water. The method of claim 6, And when the high pressure of the first refrigerant circulation unit is greater than a target high pressure derived from the temperature of the outdoor air and the water temperature, the operation rate of the first compressor is reduced. The method of claim 6, And when the high pressure of the first refrigerant circulation unit is smaller than a target high pressure derived from the temperature of the outdoor air and the water temperature, the operation rate of the first compressor is increased. 9. The method according to claim 7 or 8, An outdoor temperature detector configured to detect a temperature of the outdoor air; A water temperature sensing unit for sensing the temperature of the water; And Refrigerant cycle interlocking water circulation system further comprises; low stage side high pressure detection for sensing the high pressure of the first refrigerant circulation. 9. The method according to claim 7 or 8, And a memory unit configured to store relationship information between the temperature of the outdoor air and the temperature of water, and a target high pressure for the compression ratio of the first compressor and the compression ratio of the second compressor to be the same. system. The method of claim 6, If the operation rate difference between the first compressor and the second compressor is greater than the target operation rate difference calculated from the temperature of the outdoor air and the water temperature, the operation rate of the first compressor is reduced. Circulatory system. The method of claim 6, If the operation rate difference between the first compressor and the second compressor is smaller than the target operation rate difference calculated from the temperature of the outdoor air and the water temperature, the operation rate of the first compressor is increased. Circulatory system. 13. The method according to claim 11 or 12, An outdoor temperature detector configured to detect a temperature of the outdoor air; A water temperature sensing unit for sensing the temperature of the water; A low stage operation rate detection unit detecting an operation rate of the first compressor; And Refrigerant cycle interlocking water circulation system comprising a; high stage operation rate detection unit for detecting the operation rate of the second compressor. 13. The method according to claim 11 or 12, And a memory unit configured to store relationship information between the temperature of the outdoor air and the temperature of water and a target operation rate difference for the compression ratio of the first compressor and the compression ratio of the second compressor to be the same. Circulatory system. The method of claim 1, The operation rate of the second compressor is, If the temperature of the water is greater than the target temperature, The refrigerant cycle interlocking water circulation system, characterized in that when the temperature of the water is less than the target temperature is increased.

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