KR20150074639A - An air conditioning system and a method for controlling the same - Google Patents

Abstract

The present invention relates to an air conditioning system and a control method thereof.
An air conditioning system according to an embodiment of the present invention includes: an outdoor unit disposed in an outdoor space, the outdoor unit having a compressor and an outdoor heat exchanger; A plurality of indoor units disposed in the indoor space and having an indoor heat exchanger; And a distribution unit for distributing and introducing refrigerant into the plurality of indoor units, wherein the outdoor unit includes an outdoor expansion device disposed at an outlet side of the outdoor heat exchanger; A bypass pipe for guiding the refrigerant passing through at least a part of the outdoor heat exchanger to bypass the outdoor expansion device; And an outdoor joint portion in which a refrigerant having passed through the outdoor expansion device and a refrigerant flowing through the bypass pipe are joined together.

Description

[0001] The present invention relates to an air conditioning system and a control method thereof,

The present invention relates to an air conditioning system and a control method thereof.

The air conditioner is a device for keeping the air in a predetermined space in a most suitable condition according to the purpose of use and purpose. Generally, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and a refrigeration cycle for compressing, condensing, expanding, and evaporating the refrigerant is driven to cool or heat the predetermined space .

The predetermined space may be variously proposed depending on the place where the air conditioner is used. For example, when the air conditioner is installed in a home or an office, the predetermined space may be an indoor space of a house or a building. On the other hand, when the air conditioner is disposed in a car, the predetermined space may be a boarding space on which a person boarded.

When the air conditioner performs the cooling operation, the outdoor heat exchanger provided in the outdoor unit functions as a condenser, and the indoor heat exchanger provided in the indoor unit functions as an evaporator. On the other hand, when the air conditioner performs the heating operation, the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator.

1 is a view showing a configuration of a conventional air conditioning system.

1, an air conditioning system 1 includes an outdoor unit 2 having a compressor and an outdoor heat exchanger, a plurality of distribution units 3 connected to the outdoor unit 1, and a plurality of distribution units 3 And a plurality of indoor units 4 each having an indoor heat exchanger.

For example, as shown in FIG. 1, the plurality of distribution units 3 include a first distribution unit and a second distribution unit, and the first indoor unit and the second indoor unit are included in the plurality of indoor units 4 . The first distribution unit may be connected to the first indoor unit, and the second distribution unit may be connected to the second indoor unit.

The plurality of distribution units 3 are devices for distributing the refrigerant discharged from the outdoor unit 2 to the plurality of indoor units 4 and are connected to the outdoor unit 1 and the plurality of indoor units 4 Can be connected.

In detail, the outdoor unit 2 and the distribution unit 3 can be connected through three pipes. The three pipes include a low-pressure pipe 5, a liquid pipe 6 and a high-pressure pipe 7.

The low-pressure engine 5 is a pipe that flows until the refrigerant in the refrigeration cycle is evaporated in the evaporator and then flows into the compressor. The liquid pipe 6 is a pipe that flows after being condensed in the condenser, It can be understood as a pipe flowing after being compressed in the compressor and flowing into the condenser.

The three pipelines may be branched and connected to the first distribution unit and the second distribution unit.

One of the plurality of distribution units 3 and one indoor unit 4 of the plurality of indoor units 4 may be connected through two pipes. The two pipes include a gas pipe 8 through which the gaseous refrigerant flows and a liquid pipe 9 through which the liquid refrigerant flows.

That is, in the conventional air conditioning system, the outdoor unit 2 and the distribution unit 3 are connected through three pipes, and the distribution unit 3 and the indoor unit 4 are connected through two pipes.

However, in the case where the outdoor unit 2 and the distribution unit 3 are connected through three pipes as described above, installation and assembly of the outdoor unit 2 and the distribution unit 3 are complicated, and the piping and the outdoor unit Unit) must be excessively provided, so that installation reliability is deteriorated.

On the other hand, in the case of the heating main body simultaneous operation in which the cooling indoor unit and the heating indoor unit are included in the indoor unit and the refrigeration cycle is driven, that is, the cooling operation is mainly performed through the cooling indoor unit and the heating operation is performed through some heating indoor units, There is a problem in that the refrigerant in the gas phase is not sufficiently supplied, or the pressure loss is generated, thereby deteriorating the heating capacity.

Further, when the number of the cooling and cooling indoor units to be operated is small, that is, when the operation is performed in a state where the indoor cooling load is small, the phenomenon occurs that the evaporation capacity of the required refrigerant is low while the condensation capacity is relatively large.

As a result, an unbalance between the capacity of the condenser and the capacity of the evaporator is generated, so that the high discharge pressure of the compressor is lowered, and the refrigerant can not flow smoothly.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioning system capable of improving heating capacity and reducing pressure loss.

An air conditioning system according to an embodiment of the present invention includes: an outdoor unit disposed in an outdoor space, the outdoor unit having a compressor and an outdoor heat exchanger; A plurality of indoor units disposed in the indoor space and having an indoor heat exchanger; And a distribution unit for distributing and introducing refrigerant into the plurality of indoor units, wherein the outdoor unit includes an outdoor expansion device disposed at an outlet side of the outdoor heat exchanger; A bypass pipe for guiding the refrigerant passing through at least a part of the outdoor heat exchanger to bypass the outdoor expansion device; And an outdoor joint portion in which a refrigerant having passed through the outdoor expansion device and a refrigerant flowing through the bypass pipe are joined together.

In addition, the present invention further includes a valve device installed in the bypass pipe and capable of controlling the amount of refrigerant flowing through the bypass pipe.

The outdoor heat exchanger may further include: a first heat exchange unit that is heat-exchanged with the refrigerant; A variable flow path extending from the first heat exchange unit and having a variable valve; And a second heat exchange unit connected to the variable flow path and divided from the first heat exchange unit.

The bypass pipe may further include a first bypass pipe extending from the outdoor ridge section to the second heat exchange section; And a second bypass pipe extending from the first bypass pipe to the variable flow passage.

The first heat exchanger may further include a variable valve provided in the variable passage and selectively introducing the refrigerant having passed through the first heat exchanger to the second heat exchanger.

The valve device may further include: a first bypass valve installed in the first bypass pipe; And a second bypass valve installed in the second bypass pipe.

A first outdoor pipe extending from the outdoor fitting portion to the first heat exchanger of the outdoor heat exchanger; And a second outdoor pipe extending from the outdoor ridge portion to the second heat exchange portion of the outdoor heat exchanger.

A first outdoor expansion device installed in the first outdoor pipe; And a second outdoor expansion device installed in the second outdoor pipe.

A heating indoor unit load sensing unit for sensing a load of a heating indoor unit performing heating among the plurality of indoor units; And a cooling indoor unit load sensing unit for sensing a load of the cooling indoor unit performing cooling of the plurality of indoor units.

The controller may further include a controller for controlling on-off or opening of the first bypass valve and the second bypass valve based on the load information recognized by the heating indoor unit load sensing unit or the cooling indoor unit load sensing unit.

In another aspect of the present invention, there is provided a control method of an air conditioning system, comprising: operating a compressor provided in an outdoor unit to perform a heating operation through a cooling indoor unit in a plurality of indoor units and a cooling operation simultaneously with a cooling operation through a heating indoor unit ; Detecting a load of the cooling indoor unit or the heating indoor unit; And performing opening / closing or opening adjustment of a bypass valve for bypassing the outdoor expansion device based on the load information sensed by the cooling indoor unit or the heating indoor unit.

The outdoor unit may further include an outdoor heat exchanger having first and second heat exchange units connected to each other by a variable flow path; A bypass piping for guiding the refrigerant passing through at least a part of the outdoor heat exchanger to bypass the outdoor expansion device; And an outdoor joint portion in which a refrigerant having passed through the outdoor expansion device and a refrigerant flowing through the bypass pipe are joined together.

The bypass pipe may further include a first bypass pipe extending from the outdoor fitting portion to the second heat exchanger of the outdoor heat exchanger, wherein the first bypass pipe of the bypass valve is installed; And a second bypass pipe extending from the first bypass pipe to the variable flow passage, wherein a second bypass valve of the bypass valve is installed.

The first bypass valve and the second bypass valve are opened or opened when the load of the heating indoor unit is below the set load.

In addition, when the load of the cooling indoor unit is equal to or more than the set load, the variable flow path is opened to allow the refrigerant to flow through the first heat exchanging unit and the second heat exchanging unit. When the load of the cooling / So that the refrigerant flows through the first heat exchanging unit.

According to the air conditioning system of the present invention, since the refrigerant condensed in a part of the heat exchanger of the outdoor heat exchanger is bypassed to the outlet of the outdoor heat exchanger in the case of simultaneous operation of the refrigerant main body, The pressure loss can be reduced, and the heating performance can be improved.

Also, since the outdoor fan, the outdoor expansion device, or the bypass valve can be selectively controlled based on the load of the heating indoor unit, the two-phase refrigerant can be generated and the gaseous refrigerant among the generated two-phase refrigerant can be supplied to the heating indoor unit. There is an advantage that the operation of the matching system is easy.

Further, only a part of the heat exchanging units of the plurality of heat exchanging units constituting the outdoor heat exchanger can be used (partial cooling operation) on the basis of the load of the cooling / cooling indoor unit.

Also, since the gas-liquid separation unit is provided between the outdoor unit and the distribution unit, and the gas-liquid separation unit is connected to the gas-liquid separation unit by two pipes, the material cost is reduced and the welded portion for connection is reduced, have.

Also, since the gas-liquid separation unit is provided, the simultaneous operation in which the air conditioning system simultaneously performs cooling or heating operation and the switching-type operation in which the cooling or heating operation is switched and operated can be performed for the same outdoor unit configuration .

Further, since the gas-liquid separation unit can be detachably coupled to the outdoor unit and the distribution unit through the pipe connection unit, the gas-liquid separation unit can be easily installed and replaced.

Further, when the gas-liquid separation unit and the distribution unit are removed, there is an effect that switching-type operation is possible through the outdoor unit and the indoor unit.

1 is a view showing a configuration of a conventional air conditioning system.
2 is a view showing a configuration of an air conditioning system according to an embodiment of the present invention.
3 is a cycle diagram showing a detailed configuration of an air conditioning system according to an embodiment of the present invention.
FIG. 4 is a view showing a flow of refrigerant in a cooling-only operation mode in an air conditioning system according to an embodiment of the present invention.
FIG. 5 is a view showing a flow of a refrigerant when an additional operation is performed during a cooling operation in an air conditioning system according to an embodiment of the present invention. FIG.
6 is a block diagram showing the configuration of an air conditioning system according to an embodiment of the present invention.
7 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

2 is a view showing a configuration of an air conditioning system according to an embodiment of the present invention.

2, an air conditioning system 10 according to an embodiment of the present invention includes an outdoor unit 100, a gas-liquid separation unit 200, a distribution unit 300, and a plurality of indoor units 400 .

In detail, the gas-liquid separation unit 200 is detachably coupled to the outdoor unit 100. The air conditioning system 10 includes two pipes 191 and 192 for connecting the outdoor unit 100 and the gas-liquid separation unit 200. The two pipes 191 and 192 include a first connection pipe 191 and a second connection pipe 192 which are connected to one side of the gas-liquid separation unit 200.

For example, the first connection pipe 191 may include an orifice in which the gaseous refrigerant compressed in the refrigeration cycle flows. The second connection pipe 192 may include a liquid pipe through which liquid refrigerant condensed in the refrigeration cycle flows.

The gas-liquid separation unit 200 is provided with a first pipe connection part 201 to which the first connection pipe 191 and the second connection pipe 192 are detachably coupled. That is, the gas-liquid separation unit 200 includes two first pipe connection portions 201.

The air conditioning system 10 includes three pipes 193, 194 and 195 for connecting the gas-liquid separation unit 200 and the distribution unit 300. The third piping 193, 194 and 195 include a third piping 193 connected to the other side of the gas-liquid separation unit 200 and a fourth piping 194 and a fifth piping 195.

The gas-liquid separation unit 200 is provided with a second piping connection part 205 to which the third connection piping 193, the fourth connection piping 194 and the fifth connection piping 195 are detachably coupled do. That is, the gas-liquid separation unit 200 includes three second pipe connection portions 205.

The air conditioning system 10 includes a plurality of distribution pipes 390 connecting the distribution unit 300 and the plurality of indoor units 400. The distribution pipe connecting the distribution unit 300 and the indoor unit 400 is provided with an inlet pipe for guiding the inflow of the refrigerant into the indoor unit 400 and an outlet pipe for guiding the refrigerant from the indoor unit 400, May be included.

Hereinafter, the detailed configuration of the air conditioning system 10 will be described.

3 is a cycle diagram showing a detailed configuration of an air conditioning system according to an embodiment of the present invention.

3, an air conditioning system 10 according to an embodiment of the present invention includes an outdoor unit 100 disposed outdoors, a gas-liquid separation unit 200 connected to the outdoor unit 100, A distribution unit 300 connected to the unit 200 for distributing the refrigerant and a plurality of indoor units 400 for allowing the refrigerant dispensed from the distribution unit 300 to flow therethrough.

Although not shown in the drawings, the indoor unit may include an indoor heat exchanger that exchanges heat with air in the indoor space, and an expansion device (hereinafter, indoor expansion device) that expands the refrigerant flowing into the indoor heat exchanger.

The outdoor unit 10 includes a compressor 101 and an outdoor gas-liquid separator 105 disposed at the inlet side of the compressor 101 for separating the liquid refrigerant and the gaseous refrigerant from the refrigerant to be introduced into the compressor 101 do. The gaseous refrigerant separated by the outdoor gas-liquid separator 105 may be introduced into the compressor 101.

The outdoor unit 100 includes a flow path switching unit 107 for guiding the refrigerant compressed by the compressor 101 to the outdoor heat exchanger 111, 112 or the gas-liquid separation unit 200. The flow path switching unit 107 may include a four-way valve.

When the air conditioner operates in the cooling mode, the refrigerant flows from the flow path switching unit 107 to the outdoor heat exchangers 111 and 112. On the other hand, when the air conditioner performs the heating operation, the refrigerant flows into the gas-liquid separation unit 200 from the flow path switching unit 107.

The outdoor heat exchangers (111, 112) include a plurality of heat exchanging sections. The plurality of heat exchanging units include a first heat exchanging unit 111 and a second heat exchanging unit 112 connected in parallel.

A check valve 129 is provided at one side of the first heat exchanging unit 111 and the second heat exchanging unit 112. The refrigerant passing through the flow path switching part 107 is limited to the refrigerant flowing into the second heat exchanging part 112 and can be introduced into the first heat exchanging part 111 by the check valve 129.

The first heat exchanger 111 includes a first capillary 111a for reducing the pressure of the refrigerant during the heating operation. The second heat exchanging part 112 includes a second capillary 112a.

The outdoor unit 100 is provided with a variable flow passage 115 for guiding the flow of the refrigerant from the outlet side of the first heat exchange unit 111 to the inlet side of the second heat exchange unit 112, And a variable valve 117 provided on the variable flow path 115 to selectively block the flow of the refrigerant. Depending on whether the variable valve 117 is turned on or off, the refrigerant having passed through the first heat exchanging unit 111 may be selectively introduced into the second heat exchanging unit 112.

More specifically, when the variable valve 117 is turned on or opened, the refrigerant that has passed through the first heat exchange unit 111 flows into the second heat exchange unit 112 via the variable flow path 115, Flows through the second outdoor pipe (121b) after passing through the heat exchanging part (112). On the other hand, when the variable valve 117 is turned off or closed, the refrigerant flows through the first outdoor pipe 121a after passing through the first heat exchange unit 111. [ The first outdoor pipe 121a and the second outdoor pipe 121b are collectively called "outdoor pipe".

The outdoor unit 100 is provided with a first outdoor pipe 121a extending to the outlet of the first heat exchange unit 111 and a second outdoor expansion unit 121b provided in the first outdoor pipe 121a, Apparatus 118 is included.

The outdoor unit 100 is provided with a second outdoor pipe 121b extending to the outlet side of the second heat exchange unit 112 and a second outdoor pipe 121b provided in the second outdoor pipe 121b to control the flow of the refrigerant. An outdoor expansion device 119 is included.

When the first outdoor expansion device 118 is opened or its opening degree is increased, the amount of refrigerant flowing through the first heat exchange part 111 and the first outdoor pipe 121a is increased. When the second outdoor expansion device 119 is opened or its opening degree is increased, the amount of refrigerant flowing through the second heat exchange part 112 and the second outdoor pipe 121b is increased.

Meanwhile, the first outdoor expansion device 118 and the second outdoor expansion device 119 may be connected in parallel. The first outdoor expansion device 118 or the second outdoor expansion device 119 may be formed of an electronic expansion valve to expand the refrigerant to be introduced into the outdoor heat exchangers 111 and 112 during the heating operation, .

The outdoor unit 100 includes an outdoor joint part 120 that joins the refrigerant that has passed through the first outdoor expansion device 118 and the second outdoor expansion device 119 during a cooling operation. The refrigerant mixed in the outdoor joint part 120 may be discharged from the outdoor unit 100 and may be introduced into the gas-liquid separation unit 200. On the other hand, the outdoor joint part 120 may function to branch the refrigerant to the first outdoor pipe 121a or the second outdoor pipe 121b during the heating operation. Therefore, the outdoor joint portion 120 may be referred to as an "outdoor branch portion ".

The outdoor unit 100 includes bypass pipes 122 and 123 for bypassing at least a portion of the refrigerant flowing through the first outdoor pipe 121a or the second outdoor pipe 121b.

The bypass pipes 122 and 123 are connected to the outdoor joint part 120 and extend to the second heat exchanger 112 by bypassing the first outdoor pipe 121a or the second outdoor pipe 121b A first bypass pipe 122 is included.

For example, when heating is performed simultaneously with cooling, at least a part of the refrigerant heat-exchanged in the second heat exchange unit 112 bypasses the second outdoor pipe 121b, Flows into the piping 122, and flows to the outdoor joint part 120.

As another example, when cooling is performed mainly by heating, the refrigerant may flow into the second heat exchanger 112 from the outdoor ridge portion 120 via the first bypass pipe 122 .

The first bypass pipe 122 may be provided with a first bypass valve 126. The first bypass valve 126 can control the amount of refrigerant flowing through the first bypass pipe 122.

The first bypass valve 126 may include a solenoid valve capable of ON / OFF control or an electronic expansion valve (EEV) capable of adjusting opening degree. The amount of the refrigerant flowing through the first bypass pipe 122 can be adjusted according to the ON / OFF or the opening degree of the first bypass valve 126.

The bypass piping 122 and 123 are connected to the first bypass piping 122 and bypass the first bypass piping 122 to the second bypass piping 122 extending to the first heat exchanging unit 111. [ (123).

The second bypass pipe 123 may be connected to the variable flow path 115. That is, one end of the second bypass pipe 123 may be connected to the first bypass pipe 122, and the other end may be connected to the variable flow path 115.

For example, when heating is performed simultaneously with cooling, the refrigerant of at least part of the refrigerant heat-exchanged in the first heat exchanging part 111 flows from the variable flow path 115 to the second bypass pipe 123 And can flow to the outdoor joint portion 120 via the first bypass pipe 122.

As another example, when cooling is performed simultaneously with heating as the main body, the refrigerant flowing through the first bypass pipe 122 flows through the second bypass pipe 123 and the variable flow path 115 to the first And may be introduced into the heat exchange unit 111.

The second bypass pipe 123 may be provided with a second bypass valve 127. The second bypass valve 127 can control the amount of refrigerant flowing through the second bypass pipe 123.

The second bypass valve 127 may include a solenoid valve capable of ON / OFF control or an electronic expansion valve (EEV) capable of adjusting opening degree. The amount of the refrigerant flowing through the second bypass pipe 123 can be adjusted according to on / off or opening of the second bypass valve 127.

The air conditioning system 10 includes a first connection pipe 191 and a second connection pipe 192 for connecting the outdoor unit 100 and the gas-liquid separation unit 200. The first connection pipe 191 extends from the flow path switching unit 107 to the gas-liquid separation unit 200 and the second connection pipe 192 extends from the outdoor connection unit 120 to the gas- 200.

The gas-liquid separation unit 200 includes a first pipe connection part 201 detachably coupled to the first connection pipe 191 and the second connection pipe 192. Therefore, the number of the first pipe connection units 201 may be two.

The gas-liquid separation unit 200 includes bridge circuits 221 and 225 for guiding the refrigerant introduced into the gas-liquid separation unit 200 through the first connection pipe 191 or the second connection pipe 192.

The bridge circuits 221 and 225 include a first bridge pipe 221 and a second bridge pipe 225.

The first bridging pipe 221 is coupled to the first connecting pipe 191 and guides the refrigerant flowing through the first connecting pipe 191 to the gas-liquid separator 210 during heating operation. The second bridging pipe 225 is connected to the second connection pipe 192 and is configured to guide the refrigerant from the gas-liquid separator 210 to the second connection pipe 192 during the heating operation.

The bridge circuits 221 and 225 include a first check valve 221a provided to the first bridge pipe 221 and a second check valve 225a provided to the second bridge pipe 225. The first check valve 221a and the second check valve 225a guide only the unidirectional flow of the refrigerant in the pipes 221 and 225.

A third check valve 226 is provided on one side of the bridge circuits 221 and 225. The third check valve 226 allows the refrigerant introduced into the gas-liquid separator 200 to flow into the first bridge pipe 221 through the first connection pipe 191, 193 from being discharged from the gas-liquid separation unit 200.

The gas-liquid separator 200 includes a gas-liquid separator 210 for separating the gas-phase and liquid-phase refrigerant from the refrigerant flowing through the first bridge pipe 221 or the refrigerant piped from the outdoor joint part 120 do.

The gas-phase refrigerant separated by the gas-liquid separator 210 flows into the distribution unit 300, and the separated liquid-phase refrigerant can be introduced into the subcooler 230. The subcooler 230 is disposed at the outlet side of the gas-liquid separator 210.

The subcooler 230 can be understood as an intermediate heat exchanger in which a first refrigerant circulating through the system 10 and a refrigerant (a second refrigerant) of a portion of the first refrigerant are branched and then heat-exchanged.

The gas-liquid separation unit (200) includes a supercooling flow path (231) through which the second refrigerant is branched. The supercooling passage 231 is provided with a supercooling expansion device 235 for reducing the pressure of the second refrigerant. The supercooling expansion device 235 may include an EEV (Electric Expansion Valve).

A subcooling outlet pipe 245 and a first flow rate regulator 241 provided in the subcooling outlet pipe 245 are provided at the outlet side of the subcooler 230. The first flow rate regulator 241 is configured to regulate the amount of the first refrigerant passing through the subcooler 230.

For example, when the first flow rate regulator 241 is opened, heat is exchanged in the subcooler 230, and the refrigerant that has passed through the subcooler 230 may flow into the distribution unit 300 . On the other hand, when the first flow rate regulator 241 is closed, heat exchange in the subcooler 230 does not occur.

The gas-liquid separating unit 200 is connected to the gas-liquid separator 200 through the indoor unit 400 in the process of performing the heating operation, And a second flow rate regulator 243 for regulating the flow rate.

The first flow rate regulator 241 or the second flow rate regulator 243 may include an electric expansion valve (EEV), for example. Accordingly, the pressure reduction degree of the refrigerant passing through the first flow rate regulator 241 or the second flow rate regulator 243 can be adjusted.

The gas-liquid separation unit 200 is provided with a second pipe connection portion 205. A plurality of connection pipes connected to the distribution unit 300 may be detachably coupled to the second pipe connection unit 205. The plurality of connection pipes include a third connection pipe 193, a fourth connection pipe 194, and a fifth connection pipe 195.

The gas-liquid separation unit (200) includes a gas-liquid separation joint part (250) in which a refrigerant is jointed. When the cooling only operation is performed, the second refrigerant passing through the subcooler 230 and the refrigerant evaporated in the plurality of indoor units 400 may be combined in the gas-liquid separation joint part 250 Reference).

The distribution unit 300 functions to distribute the refrigerant discharged from the gas-liquid separation unit 200 to the plurality of indoor units 400.

In detail, the distribution unit 300 includes a plurality of distribution pipes 310, 312, and 314 for guiding the inflow of the refrigerant into the one indoor unit 400 or the discharge of the refrigerant that has passed through the one indoor unit 400. The plurality of distribution pipes 310, 312 and 314 includes a first distribution pipe 310, a second distribution pipe 312 and a third distribution pipe 314.

The first distribution pipe 310 is a pipe through which the gaseous refrigerant separated by the gas-liquid separator 210 flows, the second distribution pipe 312 is a pipe connected to the third connection pipe 193, The third distribution pipe 314 can be understood as a pipe connected to the subcooling outlet pipe 245.

The first distribution pipe 310 is provided with a first distribution valve 321 to control the flow rate of the refrigerant and the second distribution pipe 312 is provided with a second distribution valve 323, .

As shown in FIG. 3, the plurality of distribution pipes 310, 312, and 314 and the distribution valves 321 and 323 are provided corresponding to the respective indoor units. In addition, the plurality of distribution pipes 310, 312, and 314 provided in the one indoor unit may be branched and extended from the plurality of distribution pipes 310, 312, and 314 provided in the other indoor units.

The indoor unit (400) is provided with an indoor heat exchanger and an indoor expansion device. The refrigerant flowing into the one indoor unit may be decompressed in the indoor expansion unit and then evaporated in the indoor heat exchanger.

Hereinafter, the operation according to the operation mode and the refrigerant flow in the air conditioning system according to the present embodiment will be described.

FIG. 4 is a view showing a flow of a refrigerant in a cooling-only operation mode in an air conditioning system according to an embodiment of the present invention. Referring to FIG. 4, the operation and the refrigerant flow when the air conditioning system 10 is dedicated to cooling operation, that is, when all of the indoor units perform cooling, will be described.

The refrigerant compressed by the compressor (101) flows into the first heat exchanging part (111) through the flow path switching part (107) and is condensed. Then, the variable valve 117 can be opened. Part of the refrigerant that has passed through the first heat exchanging unit 111 flows through the first outdoor pipe 121a and the remaining part of the refrigerant flows through the variable valve 117 to the second heat exchanging unit 112 And is condensed.

The refrigerant discharged from the second heat exchanging unit (112) may be discharged from the outdoor unit (100) via the second outdoor pipe (121b).

At this time, the first bypass valve 126 and the second bypass valve 127 are closed to restrict the flow of the refrigerant.

As described above, in the case of the cooling only operation, the variable valve 117 is opened, and the refrigerant can be condensed through the plurality of heat exchange units 111 and 112 through the shielding. However, if the required cooling capacity is low, the variable valve 117 may be closed so that the refrigerant passes through the first heat exchange unit 111 only.

The refrigerant discharged from the outdoor unit 100 flows through the second connection pipe 192 and may be introduced into the gas-liquid separator 210.

The refrigerant flowing into the gas-liquid separator 210 is entirely or mainly composed of liquid refrigerant as condensed refrigerant. The liquid refrigerant separated in the gas-liquid separator 210 passes through the subcooler 230 and the first flow rate regulator 241 and can be introduced into the distribution unit 300 through the fourth connection pipe 194 have.

At this time, the supercooling expansion unit 235 and the first flow rate control unit 241 are opened, and the supercooler 230 can cool the refrigerant. The supercooling degree of the first refrigerant or the superheating degree of the second refrigerant in the supercooler 230 can be controlled according to the opening degree of the supercooling expansion unit 235. [

The refrigerant having passed through the subcooler 230, that is, the first refrigerant, flows into the third distribution pipe 314 through the fourth connection pipe 194 and is evaporated in the indoor unit 400. When a plurality of indoor units 300 are provided as in the present embodiment, the refrigerant may be branched into a third distribution pipe 314 corresponding to each indoor unit 400 and then introduced into the indoor unit 400.

The refrigerant evaporated in the plurality of indoor units 400 flows through the second distribution pipe 312 and flows into the gas-liquid separation unit 200 through the third connection pipe 193.

Meanwhile, the refrigerant vaporized in the indoor unit 400 is combined with the second refrigerant that has passed through the subcooler 230 in the gas-liquid separation unit 250.

The refrigerant flows into the outdoor unit 100 through the first connection pipe 191 and is compressed by the compressor 101. This refrigerant cycle can be repeated.

On the other hand, the first distribution valve 321 is closed, so that refrigerant flow from the gas-liquid separator 210 to the first distribution pipe 310 is restricted.

FIG. 5 is a view showing a flow of a refrigerant in an air conditioning system according to an embodiment of the present invention when the heating operation is further operated during the cooling operation. Referring to FIG. 5, the operation and the refrigerant flow when the air conditioning system 10 performs cooling independently and some of the indoor units perform heating (cooling main body heating operation) will be described.

Here, it can be understood that the term " cooling main body heating operation "means that the number of indoor units in which cooling is performed more than heating is more numerous.

The refrigerant compressed by the compressor (101) flows into the first heat exchanging unit (111) through the flow path switching unit (107).

The first bypass valve 126, the second bypass valve 127, and the variable valve 117 may be opened.

Accordingly, a part of the refrigerant passing through the first heat exchanging part 111 flows into the first outdoor expansion device 118 through the first outdoor pipe 121a, (117) to the second heat exchanger (112) and condensed.

Then, the remaining refrigerant flows to the second bypass pipe 123 through the second bypass valve 127.

Since the refrigerant flowing through the second bypass pipe 123 is condensed while passing through only the first heat exchanger 111 of the outdoor heat exchangers 111 and 112, the refrigerant may be completely condensed or partially condensed without undercooling . Therefore, the refrigerant in the two-phase state flows through the second bypass pipe 123, and the gaseous refrigerant can be supplied to the heating indoor unit.

Meanwhile, a part of the refrigerant condensed in the second heat exchanging part (112) flows into the second outdoor expansion device (119) through the second outdoor pipe (121b), and the remaining refrigerant flows into the first bypass And flows to the first bypass pipe 122 through the valve 126. At this time, the refrigerant having passed through the first bypass valve 126 is mixed with the refrigerant flowing through the second bypass pipe 123, and flows through the first bypass pipe 122.

The refrigerant flowing through the first bypass pipe 122 is discharged from the outdoor unit 100 via the outdoor joint part 120 and flows into the gas-liquid separator 210 through the second connection pipe 192 Can be introduced.

As described above, since a part of the refrigerant heat-exchanged in the second heat exchanging part 112 flows through the first bypass pipe 122, the flow area (flow space) of the refrigerant can be increased, Can be reduced.

As a result, the refrigerant discharged from the outdoor unit 110 through the outdoor heat exchangers 111 and 112 is supplied to the two-phase state Lt; / RTI >

The gaseous refrigerant separated from the gas-liquid separator 210 flows to the first distribution pipe 310 corresponding to the first indoor unit 401 through the fifth connection pipe 195 and flows into the first indoor unit 401, And can be condensed. Accordingly, the first indoor unit 401 can perform heating.

The refrigerant condensed in the first indoor unit 401 flows to the second indoor unit 402 and the third indoor unit 403 through the third distribution pipe 314. The refrigerant flowing into the second and third indoor units (402, 403) is expanded in the indoor expansion device, and then evaporated in the indoor heat exchanger to perform cooling.

The refrigerant evaporated in the second and third indoor units (402, 403) is connected to the gas-liquid separation unit (200) through the third connection pipe (193).

On the other hand, the liquid refrigerant separated in the gas-liquid separator 210 can selectively pass through the subcooler 230. In detail, the first flow rate regulator 241 may be adjusted in accordance with whether the amount of refrigerant flowing into the second and third indoor units 402 and 403 is insufficient. For example, if the amount of refrigerant to be introduced into the second and third indoor units 402 and 403 is insufficient, the low pressure will be raised.

Accordingly, when the amount of the refrigerant to be introduced into the second and third indoor units 402 and 403 is insufficient, the opening of the first flow rate regulator 241 increases. Accordingly, the first and second flow rate regulators 241, The amount of refrigerant flowing into the indoor units 402 and 403 increases.

At this time, the refrigerant having passed through the first flow rate regulator 241 may be mixed with the refrigerant that has passed through the first indoor unit 401, and may be introduced into the second and third indoor units 402 and 403.

On the contrary, when the amount of refrigerant to be introduced into the second and third indoor units 402 and 403 is sufficient, the opening of the first flow rate regulator 241 may be reduced or closed, The amount of refrigerant flowing into the second and third indoor units 402 and 403 can be reduced.

When the first flow rate regulator 241 is opened, the degree of supercooling of the first refrigerant or the degree of superheat of the second refrigerant may be controlled according to the opening degree of the supercooling expansion unit 235.

The refrigerant vaporized in the second and third indoor units (402, 403) and the second refrigerant that has passed through the subcooler (230) are combined in the gas-liquid separation joint part (250) 191 to the outdoor unit 100.

The refrigerant flowing into the outdoor unit (100) is compressed by the compressor (101) through the flow path switching unit (107). This refrigeration cycle can be repeated.

Hereinafter, the refrigerant flow during the heating operation will be briefly described with reference to FIG.

First, the operation and the refrigerant flow when the air conditioning system 10 dedicates heating operation, that is, when all indoor units perform heating, will be described.

The refrigerant compressed in the compressor 101 flows through the first connection pipe 191 through the flow path switching unit 107 and flows into the first bridge pipe 221. At this time, the refrigerant can be easily guided to the first bridging pipe 221 by the third check valve 226, and can be introduced into the gas-liquid separator 210.

The refrigerant flowing into the gas-liquid separator 210 is a high-pressure gas-phase refrigerant. The gas-phase refrigerant separated by the gas-liquid separator 210 flows into the distribution unit 300 through the fifth connection pipe 195. Meanwhile, the supercooling expansion unit 235 and the first flow rate control unit 241 are closed, so that the refrigerant does not flow into the subcooler 230.

The refrigerant flowing into the distribution unit 300 flows through the first distribution pipe 310 corresponding to each indoor unit 400 and flows into the indoor unit 400 to be condensed. At this time, the first dispense valve 321 may be opened and the second dispense valve 323 may be closed. As a result, the heating operation can be performed through the plurality of indoor units 400.

The refrigerant condensed in the indoor unit (400) is discharged from the indoor unit (400) and flows through the third distribution pipe (314).

The refrigerant flowing through the third distribution pipe 314 corresponding to each of the indoor units 400 is connected to the second flow rate regulator 243 via the fourth connection pipe 194. At this time, the second flow rate regulator 243 is fully opened, so that the pressure reducing effect of the refrigerant may not be generated.

The refrigerant that has passed through the second flow rate regulator 243 flows through the second bridge pipe 225 and flows into the outdoor unit 100 through the second connection pipe 192.

The refrigerant flowing into the outdoor unit 100 is branched by the outdoor branch 120 and flows through the first outdoor heat exchanger 111 and the second outdoor heat exchanger 121b through the first outdoor pipe 121a and the second outdoor pipe 121b. And is evaporated in the heat exchange portion 112. At this time, the first bypass valve 126 and the second bypass valve 127 are closed, so that refrigerant flow through the first and second bypass pipes 122 and 123 is restricted.

The refrigerant flowing into the second heat exchanging part 112 is not introduced into the first heat exchanging part 111 but flows through the check valve 129 to the first heat exchanging part 111, And may be joined to the refrigerant discharged from the first heat exchanging part (111).

The refrigerant having passed through the outdoor heat exchangers 111 and 112 can be introduced into the compressor 101 through the flow path switching unit 107. This refrigerant cycle can be repeated.

Next, the operation and the refrigerant flow when the air conditioning system 10 performs the heating main body cooling operation, that is, when the main body of heating is operated and a part of the indoor units performs cooling, will be described. Here, it can be understood that the term " heating main body cooling operation "means that the number of indoor units in which heating is performed is larger than that in cooling.

The refrigerant compressed in the compressor 101 flows through the first connection pipe 191 through the flow path switching unit 107 and flows into the first bridge pipe 221. At this time, the refrigerant can be introduced into the gas-liquid separator 210 by being guided by the first bridge pipe 221 without flowing to the gas-liquid separation joint part 250 by the third check valve 226 .

The refrigerant flowing into the gas-liquid separator 210 is a high-pressure gas-phase refrigerant. The gas-phase refrigerant separated by the gas-liquid separator 210 flows into the distribution unit 300 through the fifth connection pipe 195. Meanwhile, the supercooling expansion unit 235 and the first flow rate control unit 241 are closed, so that the refrigerant does not flow into the subcooler 230.

The refrigerant flowing into the distribution unit 300 is branched and flows through the first distribution pipe 310 corresponding to the first indoor unit 401 and the second indoor unit 402 and flows through the first indoor unit 401 and the second indoor unit 402 Indoor unit 402 and can be condensed. Accordingly, the heating operation can be performed through the first indoor unit 401 and the second indoor unit 402.

At least a part of the refrigerant condensed in the first indoor unit 401 and the second indoor unit 402 is mixed and flows into the third indoor unit 403. The refrigerant flowing into the third indoor unit 403 is decompressed while passing through the indoor expansion unit, and then evaporated in the indoor heat exchanger. Accordingly, the cooling operation can be performed through the third indoor unit 403.

The refrigerant evaporated in the third indoor unit 403 is discharged from the third indoor unit 403 and flows through the second distribution pipe 312 and flows through the third connection pipe 193, Unit 200 as shown in FIG.

Meanwhile, the remaining refrigerant of the refrigerant condensed in the first indoor unit 401 and the second indoor unit 402 passes through the second flow rate regulator 243 via the fourth connection pipe 194. The second flow rate regulator 243 is provided on the outlet side of the first indoor unit 401 and the second indoor unit 402.

The refrigerant can be decompressed in accordance with the opening degree of the second flow rate regulator 243 during the passage of the refrigerant through the second flow rate regulator 243. For example, the smaller the opening of the second flow rate regulator 243, the larger the pressure reducing effect.

The opening degree of the second flow rate regulator 243 may be adjusted according to the amount of refrigerant to be introduced into the third indoor unit 403.

For example, when the opening degree of the second flow rate regulator 243 is reduced, the amount of refrigerant flowing into the third indoor unit 403 relatively increases as compared with the amount of refrigerant flowing into the second flow rate regulator 243 And may have a tendency to lower the low pressure (vapor pressure) in terms of the reliability of the refrigeration cycle.

On the other hand, when the opening degree of the second flow rate regulator 243 is increased, the amount of refrigerant flowing into the third indoor unit 403 is relatively smaller than the amount of refrigerant flowing into the second flow rate regulator 243 , The low pressure (evaporation pressure) may tend to increase from the viewpoint of the reliability of the refrigeration cycle.

Accordingly, the opening degree of the second flow rate regulator 243 can be controlled to an appropriate degree of opening in consideration of the cooling capability of the third indoor unit 403 or the reliability of the refrigeration cycle.

The refrigerant decompressed in the second flow rate regulator 243 flows from the third indoor unit 403 via the third connection pipe 193 to the refrigerant flowing into the gas- And are joined together in the branch 250.

The refrigerant flows into the outdoor unit 100 through the second bridge pipe 225. The gaseous refrigerant may be a two-phase refrigerant in which gaseous refrigerant and liquid refrigerant are mixed.

The refrigerant flowing into the outdoor unit 100 is branched by the outdoor branch 120 and flows through the first outdoor heat exchanger 111 and the second outdoor heat exchanger 121b through the first outdoor pipe 121a and the second outdoor pipe 121b. And is evaporated in the heat exchange portion 112.

At this time, the variable valve 117 is closed so that the refrigerant flowing into the second heat exchanging part 112 does not flow into the first heat exchanging part 111, and the refrigerant flowing into the first heat exchanging part 111 And can be joined to the discharged refrigerant. The evaporated refrigerant may flow into the compressor 101 via the flow path switching unit 107. [

The first bypass valve 126 and the second bypass valve 127 may be opened.

The first bypass valve 126 and the second bypass valve 127 are opened so that a part of the refrigerant flowing into the outdoor unit 100 is branched by the outdoor branching unit 120, May be introduced into the compressor 101 after passing through the first heat exchanger 111 and the second heat exchanger 112 through the first bypass pipe 122 and the second bypass pipe 123 have.

In this way, since the first and second bypass pipes 122 and 123 are opened to allow the refrigerant to flow, the pressure of the refrigerant can be prevented from being lost in the outdoor unit 100.

That is, the refrigerant passing through the outdoor branch 120 is a two-phase refrigerant, and the gas-phase refrigerant may have a large pressure loss during the passage of the refrigerant through the piping. The first and second outdoor pipes 121a and 121b By opening the first and second bypass pipes 122 and 123, the refrigerant flow space can be secured and the pressure loss can be reduced accordingly.

6 is a block diagram showing the configuration of an air conditioning system according to an embodiment of the present invention.

6, the air conditioning system 10 according to the embodiment of the present invention includes an indoor unit load sensing unit 510 for sensing a load of the indoor unit, And a control unit 550 for controlling the outdoor fan 113, the first and second outdoor expansion devices 118 and 119, the first and second bypass valves 126 and 127, and the variable valve 117.

The outdoor fan 113 is provided inside the outdoor unit 100 and may be positioned at one side of the outdoor heat exchangers 111 and 112 to blow air toward the outdoor heat exchangers 111 and 112.

The load of the indoor unit may be determined based on information on the number of indoor units to be operated. That is, the greater the number of indoor units to be operated, the larger the load of the indoor unit is.

The indoor unit load sensing unit 510 includes a cooling indoor unit load sensing unit 512 for sensing a load of the cooling indoor unit during a cooling subject simultaneous operation or a heating subject simultaneous operation and a heating indoor unit load sensing unit 512 for sensing a load of the indoor heating unit, (514).

When the load sensed by the cooling and indoor unit load sensing unit 512 is equal to or higher than the set load, a refrigerant passage may be formed so that heat exchange is performed in the first and second heat exchange units 111 and 112 provided in the outdoor heat exchanger.

Alternatively, when the load sensed by the cooling / indoor unit load sensing unit 512 is equal to or lower than the set load, the refrigerant is circulated through the first and second heat exchange units 111 and 112 of the outdoor heat exchanger, A flow path can be formed.

On the other hand, when the load sensed by the heating indoor unit load sensing unit 514 is lower than the set load, a large amount of the gas refrigerant to be supplied to the heating indoor unit is not required. Accordingly, in the case of simultaneous operation of the cooling subject, the dryness of the two-phase refrigerant to be supplied to the gas-liquid separation unit 200 in the outdoor unit does not need to be high. Therefore, the degree of condensation of the refrigerant passing through the outdoor heat exchangers 111, Can be controlled to be large. However, the refrigerant should not be condensed to a supercooled state.

The control unit 550 may control the operation of the outdoor expansion device 118 or 119 or the outdoor fan 113 so that the degree of condensation of the refrigerant can be somewhat increased within a range where the refrigerant is not subcooled .

On the other hand, when the load sensed by the heating indoor unit load sensing unit 514 is equal to or higher than the set load, a large amount of the gaseous refrigerant to be supplied to the heating indoor unit is required. Therefore, in the case of simultaneous operation of the cooling subject, the dryness of the two-phase refrigerant to be supplied to the gas-liquid separation unit 200 in the outdoor unit needs to be high. Accordingly, the refrigerant passing through the outdoor heat exchangers 111, Can be controlled so that the degree of condensation of the refrigerant can be reduced.

The control unit 550 controls the operation of the outdoor expansion devices 118 and 119 or the outdoor fan 113 and the first and second bypass valves 126 and 127 in order to reduce the degree of condensation of the refrigerant. You can do it.

7 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention. The control method according to the present embodiment will be described with reference to Fig. 7

When the cooling operation of the air conditioning system 10 is started simultaneously, the compressor 101 is driven and a refrigerant cycle is formed. The refrigerant compressed in the compressor 101 is condensed while passing through the outdoor heat exchangers 111 and 112 and is then supplied to the indoor units 401, 402 and 403 through the gas-liquid separation unit 200 and the distribution unit 300 .

In this case, the condensed refrigerant may include a two-phase refrigerant, and the first and second bypass valves 126 and 127 may be in a closed state or in a state where the opening degree is reduced to a predetermined opening degree or less.

The refrigerant is condensed in the heating indoor unit of the plurality of indoor units (401, 402, 403), and the refrigerant can be evaporated in the cooling indoor unit (S11, S12).

The load of the heating indoor unit and the cooling indoor unit can be sensed (S13). If the load of the heating indoor unit is equal to or higher than the set load, the first and second bypass valves 126 and 127 can be opened or the opening degree can be increased.

The refrigerant condensed in the first heat exchanging part 111 flows through the second bypass pipe 123 and the first bypass pipe 122 and flows into the second heat exchanger Flows to the outdoor joint portion (120). At this time, since the refrigerant is only condensed in the first heat exchanging unit 111, the refrigerant can have a two-phase state having a somewhat high dryness (S14, S15).

The refrigerant condensed in the second heat exchanging part 112 flows through the first bypass pipe 122 and flows into the outdoor fitting part 120 as the first bypass valve 126 is opened or the opening degree is increased. Lt; / RTI > That is, since at least a part of the refrigerant condensed in the second heat exchanging part 112 can flow to the first bypass pipe 122, the flow space of the refrigerant increases and the pressure loss can be prevented S14, S15).

The opening degree of the first and second outdoor expansion apparatuses 118 and 119 is reduced to reduce the refrigerant pressure by a predetermined pressure to increase the degree of cleanliness and reduce the number of revolutions of the outdoor fan 113, The heat exchange amount can be lowered.

If the load of the heating indoor unit is equal to or higher than the predetermined load, the control unit may control the refrigerant passing through the outdoor heat exchangers 111 and 112 to be in a two-phase state and to increase the quality thereof (S16).

On the other hand, when the load of the heating indoor unit is equal to or lower than the set load, by controlling only the first and second outdoor expansion devices 118 and 119 and the outdoor fan 113 described in step S16, it is possible to prevent the refrigerant from becoming unnecessarily high have. That is, the first and second bypass valves 126 and 127 can be turned off or opened.

On the other hand, when the load of the cooling indoor unit is equal to or higher than the set load, the variable valve 117 is opened to condense the refrigerant in the first heat exchanging unit 111 and the second heat exchanging unit 112. That is, since the cooling load is relatively large, heat exchange can be performed using all of the outdoor heat exchangers 111 and 112 (S19).

On the other hand, when the load of the cooling and indoor unit is below the set load, the variable valve 117 is closed to restrict the condensation of the refrigerant in the second heat exchanging unit 112, and only the first heat exchanging unit 111 Allow condensation to occur. That is, since the cooling load is relatively small, the condensed amount of the refrigerant can be reduced by using only some of the heat exchangers of the entire outdoor heat exchangers 111 and 112 (S20).

In this way, the operation efficiency of the system can be improved by adjusting the heat exchange amount of the outdoor heat exchanger according to the required cooling load.

10: air conditioning system 100: outdoor unit
101: compressor 105: outdoor gas-liquid separator
111: first heat exchanger 112: second heat exchanger
113: outdoor fan 117: variable valve
118: first outdoor expansion device 119: second outdoor expansion device
122: first bypass piping 123: second bypass piping
126: first bypass valve 127: second bypass valve
191 to 195: First to fifth connecting piping 200: Gas-liquid separation unit
201: first pipe connecting portion 205: second pipe connecting portion
210: gas-liquid separator 221: first bridge pipe
225: second bridge piping 230: supercooler
241: first flow rate regulator 243: second flow rate regulator
300: distribution unit 312: first indoor piping
314: second indoor piping 316: third indoor piping
400: indoor unit 510: indoor unit load detection unit
512: Cooling indoor unit load sensing unit 514: Heating indoor unit load sensing unit

Claims (15)

An outdoor unit disposed in the outdoor space and having a compressor and an outdoor heat exchanger;
A plurality of indoor units disposed in the indoor space and having an indoor heat exchanger; And
And a distribution unit for distributing and introducing the refrigerant into the plurality of indoor units,
In the outdoor unit,
An outdoor expansion device disposed at an outlet side of the outdoor heat exchanger;
A bypass pipe for guiding the refrigerant passing through at least a part of the outdoor heat exchanger to bypass the outdoor expansion device; And
And a refrigerant flowed through the outdoor expansion device and refrigerant flowing through the bypass pipe are connected to each other. The method according to claim 1,
Further comprising a valve device installed in the bypass pipe and capable of opening and closing or adjusting the opening degree of the bypass pipe to control an amount of refrigerant flowing through the bypass pipe. 3. The method of claim 2,
In the outdoor heat exchanger,
A first heat exchanger for exchanging heat with the refrigerant;
A variable flow path extending from the first heat exchange unit and having a variable valve;
And a second heat exchange unit connected to the variable flow path and divided from the first heat exchange unit. The method of claim 3,
In the bypass piping,
A first bypass pipe extending from the outdoor ridge portion to the second heat exchanger; And
And a second bypass pipe extending from the first bypass pipe to the variable flow path. The method of claim 3,
Further comprising a variable valve provided in the variable flow passage and selectively introducing the refrigerant having passed through the first heat exchange section to the second heat exchange section. 5. The method of claim 4,
In the valve device,
A first bypass valve installed in the first bypass pipe; And
And a second bypass valve installed in the second bypass pipe. The method of claim 3,
A first outdoor pipe extending from the outdoor ridge portion to the first heat exchange portion of the outdoor heat exchanger; And
And a second outdoor pipe extending from the outdoor fitting portion to the second heat exchanging portion of the outdoor heat exchanger. 8. The method of claim 7,
A first outdoor expansion device installed in the first outdoor pipe; And
And a second outdoor expansion device installed in the second outdoor pipe. The method according to claim 6,
A heating indoor unit load sensing unit for sensing a load of a heating indoor unit performing heating among the plurality of indoor units; And
And a cooling indoor unit load sensing unit for sensing a load of the cooling indoor unit performing cooling of the plurality of indoor units. 10. The method of claim 9,
Further comprising a controller for controlling on-off or opening of the first bypass valve and the second bypass valve based on the load information recognized by the heating indoor unit load sensing unit or the cooling indoor unit load sensing unit. Performing a cooling operation through a cooling indoor unit in a plurality of indoor units and a cooling operation simultaneously with a cooling operation through a heating indoor unit by operating a compressor provided in an outdoor unit;
Detecting a load of the cooling indoor unit or the heating indoor unit;
And performing opening / closing or opening control of a bypass valve for bypassing the outdoor expansion device based on the load information sensed by the cooling indoor unit or the heating indoor unit. 12. The method of claim 11,
In the outdoor unit,
An outdoor heat exchanger having first and second heat exchange units connected by variable flow paths;
A bypass piping for guiding the refrigerant passing through at least a part of the outdoor heat exchanger to bypass the outdoor expansion device; And
A refrigerant flowed through the outdoor expansion device, and an outdoor expansion joint part in which refrigerant flowing through the bypass piping is jointed. 13. The method of claim 12,
In the bypass piping,
A first bypass pipe extending from the outdoor fitting portion to the second heat exchanger of the outdoor heat exchanger and having a first bypass valve of the bypass valve; And
And a second bypass pipe extending from the first bypass pipe to the variable flow passage, wherein the second bypass pipe is installed in the bypass valve. 14. The method of claim 13,
Wherein the first bypass valve and the second bypass valve are opened or opened when the load of the heating indoor unit is equal to or more than a set load. 13. The method of claim 12,
When the load of the cooling and indoor unit is equal to or higher than the set load, the variable flow path is opened to allow the refrigerant to flow through the first heat exchanging unit and the second heat exchanging unit,
Wherein when the load of the cooling and indoor unit is equal to or lower than a set load, the variable flow path is closed to allow the refrigerant to flow through the first heat exchange unit.

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