Air conditioning system

Abstract

The air conditioning system comprises a compressor, an outdoor heat exchanger, a throttling element, a cooler, a first distribution device, a plurality of heat exchange branches, a second distribution device and a gas-liquid separator which are sequentially communicated, and the heat exchange branches are connected between the first distribution device and the second distribution device in parallel; the first bypass branch is connected between the first distribution device and the cooler; the second bypass branch is connected between the outdoor heat exchanger and the gas-liquid separator; the third bypass branch is connected between the second distribution device and the outlet of the compressor; when the air conditioning system is in a refrigeration mode and only part of the heat exchange branches are started for heat exchange, part of refrigerant flowing to the first distribution device from the cooler flows back to the cooler along the first bypass branch; when the air conditioning system is in a heating mode and only part of heat exchange branches are started for heat exchange, part of refrigerant flowing to the indoor heat exchanger from the compressor is guided to the gas-liquid separator; therefore, the service life of the heat exchange branch is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an air conditioning system. Background Technology

[0002] Multi-split air conditioners are an important branch of split-type air conditioners, mainly used in large buildings such as commercial office buildings and food storage rooms. They consist of one outdoor unit driving multiple indoor units, each of which can be independently controlled to meet the different temperature requirements of different rooms.

[0003] However, in some usage scenarios, multiple indoor units will not be turned on and running at the same time. That is, when only a few indoor units are turned on and running, the refrigerant in the air conditioning system is only distributed in a few heat exchange branches, resulting in excessive flow in the heat exchange branches, which can easily affect the service life of the heat exchange branches. Utility Model Content

[0004] The main objective of this utility model embodiment is to provide an air conditioning system that aims to improve the technical problem in the prior art where multiple air conditioners only operate some indoor units, resulting in excessive flow in the heat exchange branch.

[0005] An embodiment of this utility model provides an air conditioning system, comprising:

[0006] The compressor, outdoor heat exchanger, throttling device, cooler, first distribution device, multiple heat exchange branches, second distribution device, and gas-liquid separator are connected in sequence. The multiple heat exchange branches are connected in parallel between the first distribution device and the second distribution device. Each heat exchange branch is equipped with an indoor heat exchanger. The outlet of the gas-liquid separator is connected to the inlet of the compressor.

[0007] A first bypass branch is connected between the first distribution device and the cooler;

[0008] The second bypass branch is connected between the outdoor heat exchanger and the gas-liquid separator;

[0009] The third bypass branch is connected between the second distribution device and the outlet of the compressor;

[0010] The first distribution device is configured to, when the air conditioning system is in cooling mode and only part of the heat exchange branch is open for heat exchange, redirect a portion of the refrigerant flowing from the cooler to the first distribution device back to the cooler along the first bypass branch;

[0011] The second distribution device is configured to direct a portion of the refrigerant flowing from the compressor to the indoor heat exchanger to the gas-liquid separator when the air conditioning system is in heating mode and only some heat exchange branches are open for heat exchange.

[0012] In some embodiments of this utility model, the first distribution device includes a plurality of first tee pipes connected in parallel between the first bypass branch and the cooler. The first tee pipe includes a first branch pipe, a second branch pipe, and a third branch pipe connected as one unit. The first branch pipes are all connected to the cooler. Each second branch pipe is connected to one of the heat exchange branches. The third branch pipes are all connected to the first bypass branch. Each third branch pipe is provided with a first regulating valve.

[0013] In some embodiments of this utility model, a second regulating valve is provided on each of the first branch pipes.

[0014] In some embodiments of this utility model, the air conditioning system further includes a refrigerant pump, and the cooler, the refrigerant pump, and the first distribution device are connected in sequence.

[0015] In some embodiments of this utility model, the second distribution device includes a plurality of second tee pipes connected in parallel between the third bypass branch and the gas-liquid separator. Each second tee pipe includes a fourth branch pipe, a fifth branch pipe, and a sixth branch pipe connected as one unit. Each fourth branch pipe is connected to the third bypass branch, each fifth branch pipe is connected to one of the heat exchange branches, and each sixth branch pipe is connected to the gas-liquid separator. Each sixth branch pipe is provided with a third regulating valve.

[0016] In some embodiments of this utility model, each of the fourth branch pipes is provided with a fourth regulating valve.

[0017] In some embodiments of this utility model, the second distribution device is connected to the gas-liquid separator through a first flow path, and one end of the second bypass branch is connected in parallel with one end of the first flow path to the plurality of fifth branch pipes.

[0018] In some embodiments of this utility model, a shut-off valve is also provided on the first bypass branch.

[0019] In some embodiments of this utility model, a second flow path is connected between the outlet of the compressor and the inlet of the outdoor heat exchanger, and a shut-off valve is provided on both the second flow path and the third bypass branch.

[0020] In some embodiments of this utility model, the air conditioning system further includes a controller, which is connected to the first distribution device and the second distribution device respectively. The controller is used to redirect a portion of the refrigerant flowing from the cooler to the first distribution device back to the cooler along the first bypass branch when the air conditioning system is in cooling mode and only some of the heat exchange branches are open for heat exchange. The controller is also used to direct a portion of the refrigerant flowing from the compressor to the indoor heat exchanger to the gas-liquid separator when the air conditioning system is in heating mode and only some of the heat exchange branches are open for heat exchange.

[0021] An embodiment of this utility model provides an air conditioning system. The air conditioning system includes a first distribution device, a second distribution device, a first bypass branch, a second bypass branch, and a third bypass branch. The first distribution device is configured to, when the air conditioning system is in cooling mode and only some heat exchange branches are open for heat exchange, direct a portion of the refrigerant flowing from the cooler to the first distribution device back to the cooler along the first bypass branch. The second distribution device is configured to, when the air conditioning system is in heating mode and only some heat exchange branches are open for heat exchange, guide a portion of the refrigerant flowing from the compressor to the indoor heat exchanger to a gas-liquid separator. This is to prevent excessive flow in the heat exchange branches caused by only some indoor units being open in a multi-split air conditioner, thus ensuring the service life of each heat exchange branch. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an air conditioning system according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the first dispensing device according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the second dispensing device according to an embodiment of the present invention.

[0026] Reference numerals: 11. First bypass branch; 12. Second bypass branch; 13. Third bypass branch; 14. First flow path; 15. Second flow path; 100. Compressor; 200. Outdoor heat exchanger; 300. Throttling device; 400. Cooler; 500. First distribution device; 510. First tee pipe; 501. First regulating valve; 502. Second regulating valve; 511. First branch pipe; 512. Second branch pipe; 513. Third branch pipe; 600. Heat exchange branch; 610. Indoor heat exchanger; 700. Second distribution device; 701. Third regulating valve; 702. Fourth regulating valve; 711. Fourth branch pipe; 712. Fifth branch pipe; 713. Sixth branch pipe; 800. Gas-liquid separator; 900. Refrigerant pump. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] like Figures 1-3 As shown, this utility model provides an air conditioning system, which includes a compressor 100, an outdoor heat exchanger 200, a throttling device 300, a cooler 400, a first distribution device 500, multiple heat exchange branches 600, a second distribution device 700, and a gas-liquid separator connected in sequence. The multiple heat exchange branches 600 are connected in parallel between the first distribution device 500 and the second distribution device 700. Each heat exchange branch 600 is provided with an indoor heat exchanger 610. The outlet of the gas-liquid separator is connected to the inlet of the compressor 100.

[0032] The compressor 100 is connected to the outdoor heat exchanger 200, the outdoor heat exchanger 200 is connected to the throttling device 300, the throttling device 300 is connected to the first distribution device 500, and the second distribution device 700 is connected to the gas-liquid separator via pipelines.

[0033] The air conditioning system also includes a first bypass branch 11, a second bypass branch 12, and a third bypass branch 13. The first bypass branch 11 is connected between the first distribution device 500 and the cooler 400; the second bypass branch 12 is connected between the outdoor heat exchanger 200 and the gas-liquid separator; and the third bypass branch 13 is connected between the second distribution device 700 and the outlet of the compressor 100.

[0034] Among them, the first bypass branch 11, the second bypass branch 12, and the third bypass branch are all pipelines.

[0035] The first distribution device 500 is configured to, when the air conditioning system is in cooling mode and only part of the heat exchange branch 600 is open for heat exchange, return part of the refrigerant flowing from the cooler 400 to the first distribution device 500 along the first bypass branch 11 back to the cooler 400.

[0036] The second distribution device 700 is configured to direct a portion of the refrigerant flowing from the compressor 100 to the indoor heat exchanger 610 to the gas-liquid separator when the air conditioning system is in heating mode and only a portion of the heat exchange branch 600 is in operation.

[0037] When the air conditioning system is in cooling mode, the refrigerant first flows from the compressor 100 through the pipe to the outdoor heat exchanger 200, and then flows to the throttling device 300 after condensation in the outdoor heat exchanger 200. After being throttled by the throttling device 300, the refrigerant flows through the pipe to the first distribution device 500, and then flows into each heat exchange branch 600 through the indoor heat exchanger 610 for evaporative heat exchange. The refrigerant from each heat exchange branch 600 flows to the second distribution device 700 and finally flows into the gas-liquid separator for gas-liquid separation. After gas-liquid separation in the gas-liquid separator, the refrigerant finally flows into the compressor 100 inlet through the pipe. If only some of the multiple heat exchange branches 600 are open, the first distribution device 500 can, in a timely manner, redirect some of the refrigerant flowing from the cooler 400 to the first distribution device 500 back to the cooler 400 along the first bypass branch 11 to reduce the flow and pressure of the open heat exchange branches 600.

[0038] When the air conditioning system is in heating mode, the refrigerant first flows from the compressor 100 into the second distribution device 700 through the third bypass branch 13, and then is diverted from the second distribution device 700 into multiple heat exchange branches 600. After condensation and heat exchange in the indoor heat exchanger 610 of the heat exchange branch 600, it flows into the first distribution device 500 for convergence, and then into the cooler 400 from the first distribution device 500. From the cooler 400, it flows into the outdoor heat exchanger 200 for evaporation and heat exchange, and then from the outdoor heat exchanger 200 into the gas-liquid separator through the second bypass branch 12. After gas-liquid separation in the gas-liquid separator, the refrigerant finally flows into the compressor 100 inlet through a pipeline. If only some of the multiple heat exchange branches 600 are open, the second distribution device 700 can guide some of the refrigerant flowing from the compressor 100 to the indoor heat exchanger 610 through a pipeline to the gas-liquid separator in a timely manner to reduce the flow and pressure of the heat exchange branches 600 that are in the open state.

[0039] Among them, the cooler 400 is generally a liquid storage tank.

[0040] It is understood that this utility model, by setting up a first distribution device 500, a second distribution device 700, a first bypass branch 11, a second bypass branch 12, and a third bypass branch 13, and configuring the first distribution device 500 to, when the air conditioning system is in cooling mode and only some heat exchange branches 600 are open for heat exchange, direct a portion of the refrigerant flowing from the cooler 400 to the first distribution device 500 back to the cooler 400 along the first bypass branch 11; and configuring the second distribution device 700 to, when the air conditioning system is in heating mode and only some heat exchange branches 600 are open for heat exchange, guide a portion of the refrigerant flowing from the compressor 100 to the indoor heat exchanger 610 to the gas-liquid separator, in order to avoid excessive flow in the heat exchange branches 600 due to only some indoor units being open in a multi-split air conditioner, and to ensure the service life of each heat exchange branch 600.

[0041] In some embodiments, the first distribution device 500 includes a plurality of first tee pipes 510 connected in parallel between the first bypass branch 11 and the cooler 400. Each first tee pipe 510 includes a first branch pipe 511, a second branch pipe 512, and a third branch pipe 513 connected as one unit. Each first branch pipe 511 is connected to the cooler 400. Each second branch pipe 512 is connected to a heat exchange branch 600. Each third branch pipe 513 is connected to the first bypass branch 11. Each third branch pipe 513 is provided with a first regulating valve 501.

[0042] Generally, the first regulating valve 501 is in the closed state, and the third branch pipe 513 is in the blocked state. In the cooling mode, the refrigerant enters the first tee pipe 510 from the first branch pipe 511, and then enters the corresponding heat exchange branch 600 from the second branch pipe 512. When the indoor heat exchanger 610 of the heat exchange branch 600 corresponding to the second branch pipe 512 is not open, the first regulating valve 501 can be controlled to open, that is, to make the third branch pipe 513 of the corresponding first tee pipe 510 in the conducting state, so that the refrigerant entering the first tee pipe 510 flows to the cooler 400 from the third branch pipe 513, thereby reducing the flow and pressure of the heat exchange branch 600 where the indoor heat exchanger 610 is in the open state.

[0043] Among them, the first regulating valve 501 is generally an electromagnetic shut-off valve, which can control the opening state of the first regulating valve 501 of each first three-way pipe 510, thereby guiding part of the refrigerant back to the cooler 400 and reducing the flow rate of the heat exchange branch 600.

[0044] In some embodiments, each first branch pipe 511 is provided with a second regulating valve 502.

[0045] The second regulating valve 502 is generally an electromagnetic shut-off valve, which can regulate the flow rate into each heat exchange branch 600 by controlling the second regulating valve 502 of each first three-way pipe 510. Generally, when the indoor heat exchanger 610 of the heat exchange branch 600 is in the open state, the second regulating valve 502 on the corresponding first three-way pipe 510 is in the open state.

[0046] In some embodiments, the air conditioning system further includes a refrigerant pump 900, a cooler 400, and a first distribution device 500 connected in sequence.

[0047] Understandably, the refrigerant pump 900 is used to deliver the refrigerant from the cooler 400 to the first distribution device 500 to avoid insufficient flow due to insufficient pipeline pressure.

[0048] In some embodiments, the second distribution device 700 includes a plurality of second tee pipes connected in parallel between the third bypass branch 13 and the gas-liquid separator. Each second tee pipe includes a fourth branch pipe 711, a fifth branch pipe 712, and a sixth branch pipe connected as one unit. Each fourth branch pipe 711 is connected to the third bypass branch 13, each fifth branch pipe 712 is connected to a heat exchange branch 600, and each sixth branch pipe is connected to the gas-liquid separator. Each sixth branch pipe is provided with a third regulating valve 701.

[0049] Generally, the third regulating valve 701 is in the closed state, and the sixth branch pipe is in the blocked state. In the heating mode, the refrigerant enters the second three-way pipe from the fourth branch pipe 711, and then enters the corresponding heat exchange branch 600 from the fifth branch pipe 712. When the indoor heat exchanger 610 of the heat exchange branch 600 corresponding to the fifth branch pipe 712 is not open, the third regulating valve 701 can be controlled to open, that is, to make the sixth branch pipe corresponding to the second three-way pipe in the conducting state, so that the refrigerant entering the second three-way pipe flows to the gas-liquid separator from the sixth branch pipe, thereby reducing the amount of refrigerant entering the heat exchange branch 600 where the indoor heat exchanger 610 is in the open state, and reducing the flow and pressure of the heat exchange branch 600.

[0050] Among them, the third regulating valve 701 is generally an electromagnetic shut-off valve. By controlling the opening state of the third regulating valve 701 of each second three-way pipe, part of the refrigerant is diverted to the gas-liquid separator, thereby reducing the flow and pressure of the heat exchange branch 600.

[0051] In some embodiments, each fourth branch pipe 711 is provided with a fourth regulating valve 702.

[0052] The fourth regulating valve 702 is generally an electromagnetic shut-off valve, which can regulate the flow rate into each heat exchange branch 600 by controlling the fourth regulating valve 702 on each second three-way pipe. Generally, when the indoor heat exchanger 610 of the heat exchange branch 600 is in the open state, the fourth regulating valve 702 on the corresponding second three-way pipe is in the open state.

[0053] In some embodiments, the second distribution station is connected to the gas-liquid separator through the first flow path 14, and one end of the second bypass branch 12 is connected in parallel to one end of the first flow path 14 with a plurality of fifth branch pipes 712.

[0054] The first flow path 14 is a pipe, and the second bypass branch 12 is connected to the first flow path 14. That is, in the heating mode, the refrigerant flowing out of the outdoor heat exchanger 200 passes through the second bypass branch 12 and the first flow path 14 in sequence and enters the gas-liquid separator.

[0055] In some embodiments, a shut-off valve is also provided on the first bypass branch 11.

[0056] The shut-off valve installed on the first bypass branch 11 can be used to close the first bypass branch 11 when the storage volume of the cooler 400 reaches the preset liquid level, so as to prevent the refrigerant content in the cooler 400 from exceeding the set standard.

[0057] The shut-off valve on the first bypass branch 11 is generally an electromagnetic shut-off valve.

[0058] In some embodiments, a second flow path 15 is connected between the outlet of the compressor 100 and the inlet of the outdoor heat exchanger 200, and a shut-off valve is provided on both the second flow path 15 and the third bypass branch 13.

[0059] The second flow path 15 is a pipe connected between the outlet of the compressor 100 and the inlet of the outdoor heat exchanger 200. When the air conditioner is in cooling mode, the shut-off valve on the second flow path 15 is open and the shut-off valve on the third bypass branch 13 is closed, so that the refrigerant flows from the compressor 100 to the outdoor heat exchanger 200. When the air conditioning system is in heating mode, the shut-off valve on the third bypass branch 13 is open and the shut-off valve on the second flow path 15 is closed, so that the refrigerant flows from the compressor 100 to the second distribution station.

[0060] Generally, the solenoid valves on the second flow path 15 and the third bypass branch 13 are solenoid shut-off valves, which can be connected to the controller of the air conditioning system.

[0061] In some embodiments, the air conditioning system further includes a controller connected to the first distribution device 500 and the second distribution device 700, respectively. The controller is used to redirect a portion of the refrigerant flowing from the cooler 400 to the first distribution device 500 back to the cooler 400 along the first bypass branch 11 when the air conditioning system is in cooling mode and only a portion of the heat exchange branch 600 is open for heat exchange. The controller is also used to direct a portion of the refrigerant flowing from the compressor 100 to the indoor heat exchanger 610 to the gas-liquid separator when the air conditioning system is in heating mode and only a portion of the heat exchange branch 600 is open for heat exchange.

[0062] Generally, temperature sensors are installed at the inlet of the first distribution device 500 and the inlet of the second distribution device 700. When the refrigerant temperature at the inlet of the second distribution device 700 is detected to be high in the cooling mode, the first distribution device 500 can be controlled to redirect a portion of the refrigerant flowing from the cooler 400 to the first distribution device 500 back to the cooler 400 along the first bypass branch 11. When the refrigerant temperature at the inlet of the first distribution device 500 is detected to be high in the heating mode, the second distribution device 700 can be controlled to direct a portion of the refrigerant flowing from the compressor 100 to the indoor heat exchanger 610 to the gas-liquid separator.

[0063] In some embodiments, controlling the operation of the first distribution device 500 and the second distribution device 700 essentially involves switching the state of the first regulating valve 501 and the third regulating valve 701 on each of the first three-way pipes 510 and the second three-way pipe.

[0064] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made based on the contents of the present utility model specification and drawings under the application concept of the present utility model, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. An air conditioning system, characterized in that, include: The compressor, outdoor heat exchanger, throttling device, cooler, first distribution device, multiple heat exchange branches, second distribution device, and gas-liquid separator are connected in sequence. The multiple heat exchange branches are connected in parallel between the first distribution device and the second distribution device. Each heat exchange branch is equipped with an indoor heat exchanger. The outlet of the gas-liquid separator is connected to the inlet of the compressor. A first bypass branch is connected between the first distribution device and the cooler; The second bypass branch is connected between the outdoor heat exchanger and the gas-liquid separator; The third bypass branch is connected between the second distribution device and the outlet of the compressor; The first distribution device is configured to, when the air conditioning system is in cooling mode and only part of the heat exchange branch is open for heat exchange, redirect a portion of the refrigerant flowing from the cooler to the first distribution device back to the cooler along the first bypass branch; The second distribution device is configured to direct a portion of the refrigerant flowing from the compressor to the indoor heat exchanger to the gas-liquid separator when the air conditioning system is in heating mode and only some heat exchange branches are open for heat exchange.

2. The air conditioning system according to claim 1, characterized in that, The first distribution device includes a plurality of first tee pipes connected in parallel between the first bypass branch and the cooler. The first tee pipe includes a first branch pipe, a second branch pipe and a third branch pipe connected as one unit. The first branch pipes are all connected to the cooler. Each second branch pipe is connected to one of the heat exchange branches. The third branch pipes are all connected to the first bypass branch. Each third branch pipe is provided with a first regulating valve.

3. The air conditioning system according to claim 2, characterized in that, Each of the first branch pipes is equipped with a second regulating valve.

4. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a refrigerant pump, and the cooler, the refrigerant pump, and the first distribution device are connected in sequence.

5. The air conditioning system according to claim 1, characterized in that, The second distribution device includes multiple second tee pipes connected in parallel between the third bypass branch and the gas-liquid separator. Each second tee pipe includes a fourth branch pipe, a fifth branch pipe, and a sixth branch pipe connected as a single unit. Each fourth branch pipe is connected to the third bypass branch, each fifth branch pipe is connected to one of the heat exchange branches, and each sixth branch pipe is connected to the gas-liquid separator. Each sixth branch pipe is equipped with a third regulating valve.

6. The air conditioning system according to claim 5, characterized in that, Each of the fourth branch pipes is equipped with a fourth regulating valve.

7. The air conditioning system according to claim 6, characterized in that, The second distribution device is connected to the gas-liquid separator through the first flow path, and one end of the second bypass branch is connected in parallel with one end of the first flow path to the plurality of fifth branch pipes.

8. The air conditioning system according to claim 1, characterized in that, A shut-off valve is also installed on the first bypass branch.

9. The air conditioning system according to claim 1, characterized in that, A second flow path is connected between the outlet of the compressor and the inlet of the outdoor heat exchanger, and a shut-off valve is provided on both the second flow path and the third bypass branch.

10. The air conditioning system according to claim 9, characterized in that, The air conditioning system further includes a controller, which is connected to the first distribution device and the second distribution device respectively. The controller is used to redirect a portion of the refrigerant flowing from the cooler to the first distribution device back to the cooler along the first bypass branch when the air conditioning system is in cooling mode and only some of the heat exchange branches are open for heat exchange. The controller is also used to direct a portion of the refrigerant flowing from the compressor to the indoor heat exchanger to the gas-liquid separator when the air conditioning system is in heating mode and only some of the heat exchange branches are open for heat exchange.

Images