Air conditioning system

Abstract

The air conditioning system comprises an outdoor unit, an indoor heat exchanger and a humidity adjusting machine, the outdoor unit comprises an outdoor heat exchanger and a compressor which are connected with each other, the outdoor heat exchanger communicates with the compressor through a four-way valve, the indoor heat exchanger communicates with the compressor through a four-way valve, and the humidity adjusting machine is provided with a third heat exchanger; a first reversing valve is connected between the outdoor heat exchanger and the third heat exchanger; the indoor heat exchanger is communicated with the first reversing valve; a second reversing valve is further arranged between the four-way valve and the indoor heat exchanger, and the third heat exchanger is communicated with the second reversing valve. Intelligent control over the temperature and humidity in the building can be achieved, the interior of the building can be in a constant-temperature and constant-humidity environment, and the user experience is enhanced.

Description

Technical Field

[0001] The present application relates to an air conditioning system, applicable to the technical field of air conditioning. Background Art

[0002] The existing air conditioner indoor unit is generally small, and the air outlet is generally located at the top. In summer, due to the small heat exchange area of ​​the heat exchanger in the indoor unit, the indoor unit fan needs to generate a large airflow to achieve the indoor cooling effect through forced convection heat exchange. When the fan generates a large airflow, it is often accompanied by a large noise, and the cold air blown out will feel very uncomfortable on the body, and the user experience is relatively poor.

[0003] When heating in winter, the air outlet is at the upper part of the building, and the heat flow density is low and floats up, so the heat generated by the indoor unit is gathered in the upper part of the building. In addition to standing, people in the building are generally at a height of about 1.2 meters when sitting and about 0.8 meters when lying, while children are generally only about 0.6 meters high. Since the temperature in the upper part of the building is higher, and the temperature sensor of the indoor unit is also set at the upper part, it will stop at any time because the temperature reaches the control threshold, but the temperature where people are still very low. The method of blowing hot air by forced convection heat exchange in the upper part of the building by the indoor unit obviously cannot meet people's demand for temperature. When people have an urgent need for heating temperature, they will adjust the control threshold of the indoor unit to reach the required temperature. Since there is a huge difference between the actual temperature in the building and the control threshold, and the outdoor unit generally adopts variable frequency control, the compressor in the outdoor unit will run at a higher frequency, resulting in huge energy consumption, but the heating effect is not obvious. At the same time, forced convection heat exchange in winter will cause people to feel hot inside, affecting the comfort of living. Utility Model Content

[0004] The purpose of this application is to design an air conditioning system, which can realize intelligent control of temperature and humidity in a building through the reasonable arrangement of valve components between the outdoor unit, indoor heat exchanger and humidifier, so that the interior of the building can be kept in a constant temperature and humidity environment, thereby enhancing the user experience.

[0005] The present application relates to an air conditioning system, comprising an outdoor unit, an indoor heat exchanger and a humidifier, wherein the outdoor unit comprises an outdoor heat exchanger and a compressor connected to each other, the outdoor heat exchanger and the compressor as well as the indoor heat exchanger and the compressor are connected via a four-way valve, the humidifier is provided with a third heat exchanger, a first reversing valve is connected between the outdoor heat exchanger and the third heat exchanger, and the indoor heat exchanger is connected to the first reversing valve; a second reversing valve is also provided between the four-way valve and the indoor heat exchanger, and the third heat exchanger is connected to the second reversing valve.

[0006] Preferably, a throttle valve is provided between the outdoor heat exchanger and the first reversing valve; the exhaust end of the compressor is connected to port a of the four-way valve, the suction end of the compressor is connected to port c of the four-way valve, port b of the four-way valve is connected to one port of the outdoor heat exchanger, and port d of the four-way valve is connected to port a of the second reversing valve; another port of the outdoor heat exchanger is connected to the throttle valve, the throttle valve is connected to port a of the first reversing valve, port b of the first reversing valve is connected to a port of the third heat exchanger on the humidifier, another port of the third heat exchanger is connected to port b of the second reversing valve, port c of the first reversing valve is connected to a port of the indoor heat exchanger, and another port of the indoor heat exchanger is connected to port c of the second reversing valve.

[0007] Preferably, a first connecting valve is further provided between the pipeline connecting the indoor heat exchanger to the first reversing valve and the pipeline connecting the third heat exchanger to the second reversing valve, and the indoor heat exchanger is connected in series with the third heat exchanger; or, a third connecting valve is provided on the pipeline connecting the indoor heat exchanger to the port b of the first reversing valve, and a second connecting valve is provided on the pipeline connecting the indoor heat exchanger to the port b of the second reversing valve, and the indoor heat exchanger is connected in parallel with the third heat exchanger.

[0008] A control unit may be provided, and the control unit may be connected to at least one of a temperature sensor and a humidity sensor; at least one of the temperature sensor and the humidity sensor may be set within a height range of 0.6-1.2 meters from the ground; the control unit may be connected to the outdoor unit, the indoor heat exchanger and the humidifier. A fan may be provided on the humidifier, and the humidifier may be provided with a receiving plate, and at least a part of the third heat exchanger may be immersed in the water of the receiving plate.

[0009] (1) The air conditioning system of the present application can realize intelligent control of temperature and humidity in a building. In particular, according to the characteristics of humidification after heating in winter and dehumidification before cooling in summer, by reasonably designing the connection relationship between system components and combining the temperature and humidity data detected by indoor sensors, intelligent control of indoor temperature and humidity can be realized. Specifically, the present application realizes cooling in summer or heating in winter without wind noise or heat, and can simultaneously realize constant temperature and humidity. By setting the sensor within the height range of 0.6-1.2 meters, the human body sensing needs can be met most appropriately. At the same time, when cooling in summer, the building is dehumidified before cooling, which solves the condensation problem that is easy to occur in floor radiation cooling.

[0010] (2) In one embodiment, the heat exchanger can be pre-buried in the concrete layer of the floor slab with good heat storage and energy storage functions. By transferring heat to and dissipating heat from the concrete layer, the temperature fluctuation in the building can be kept very small for a long time, thereby making full use of peak and valley electricity to generate economic benefits. That is, the concrete layer can be used to store energy during valley electricity and release energy during peak electricity, thereby reducing the power consumption during peak electricity and achieving good economic benefits. Parallel pipeline heat exchangers can be used preferentially to reduce the increase in refrigerant flow resistance caused by the growth of pipelines due to the large-scale laying of heat exchangers in the building, thereby reducing the operating power of the compressor. Since the area of ​​the heat exchanger is much larger than the area of ​​the forced convection heat exchanger, the refrigerant can be fully heat exchanged in the heat exchanger, with subcooling or superheating, thereby achieving energy saving in both aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram showing an air conditioning system of the present application.

[0012] Figure 2 A schematic diagram showing the connection components of the air conditioning system of the present application.

[0013] Figure 3 Schematic diagram showing the dehumidification cycle in cooling state.

[0014] Figure 4 Schematic diagram showing the refrigeration cycle in cooling state.

[0015] Figure 5 Schematic diagram showing the heating cycle in heating state.

[0016] Figure 6 Schematic diagram showing the humidification cycle in heating mode.

[0017] Figure 7 Schematic diagram showing the airflow cycle of the present application.

[0018] Figure 8 Displays the control logic diagram of this application.

[0019] Fig. 9 A schematic diagram showing the third heat exchanger and the indoor heat exchanger of the present application connected in series.

[0020] Fig.10 A schematic diagram showing the third heat exchanger and the indoor heat exchanger of the present application connected in parallel. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0022] like Figure 1 As shown, the air conditioning system of the present application includes an outdoor unit 1, an indoor heat exchanger 2, a humidifier 3 and a reversing valve group 4. The outdoor unit 1 is installed outside the building 6, and the indoor heat exchanger 2 and the humidifier 3 are installed inside the building. The indoor heat exchanger 2 can adopt a parallel pipeline heat exchanger, which is convenient for transportation, storage and paving. At the same time, since the parallel pipeline heat exchanger has a huge specific surface area, it can greatly increase the heat exchange area and improve the heat exchange efficiency. The reversing valve group 4 can be installed in the building 6, or it can be integrated on the outdoor unit 1. The indoor heat exchanger 2 is arranged in the bottom area of ​​the building, for example, it can be installed in the bottom floor of the building 6, or it can be placed on the floor of the building or hung on the bottom inner wall of the building, and the humidifier 3 is installed at the bottom of the building 6. The outdoor unit 1 includes an outdoor heat exchanger 11, a compressor 12 and a throttle valve 142 connected to each other. A four-way valve 141 is connected between the outdoor heat exchanger 11 and the compressor 12 and between the indoor heat exchanger 2 and the compressor 12, and the outdoor heat exchanger 11 is connected to the throttle valve 142. The humidifier 3 is also provided with a third heat exchanger 31. A first reversing valve 41 is connected between the outdoor heat exchanger 11 and the third heat exchanger 31, and the indoor heat exchanger 2 is also connected to the first reversing valve 41. A second reversing valve 42 is also provided between the four-way valve 141 and the indoor heat exchanger 2, and the third heat exchanger 31 is also connected to the second reversing valve 42.

[0023] A control unit 5 may also be installed in the building 6. The control unit 5 is connected to a temperature sensor and a humidity sensor arranged in the building 6. By sensing the temperature and humidity in the building 6, the control unit 5 realizes the control of the outdoor unit 1 and its compressor 12, fan 13, four-way valve 14, and a controller 15 arranged on the outdoor unit 1 for controlling the outdoor unit 1, and the fan and reversing valves 41 and 42 on the humidifier 3, thereby realizing intelligent control of the air conditioning system of the entire building. The control logic is as follows: Figure 8 As shown. The sensor in the building is set at a height of 0.6-1.2 meters, preferably 0.8-1.0 meters, which is within the height of the area with the most human activities. The data measured by it is closest to the body sensation, and control based on this can accurately meet the needs of the human body. Considering the humidity control in the building, when the control unit 5 controls the indoor heat exchanger 2 embedded in the floor to cool the air in the building, it is preferred to turn on the humidifier 3 in three stages to adjust the humidity in the building 6, namely: before the indoor heat exchanger 2 starts heat exchange; during the heat exchange process of the indoor heat exchanger 2, the air outside the building 6 is introduced into the building due to the opening and closing of the doors and windows of the building 6, causing the humidity in the building 6 to increase; after the indoor heat exchanger 2 is turned off, because the indoor heat exchanger 2 is embedded in the concrete layer of the floor of the building 6 and the concrete layer has the function of storing cold and energy, the humidifier 3 needs to continue to adjust the humidity in the building 6.

[0024] like Figure 2 As shown, the refrigeration cycle connection relationship of the air conditioning system of the present application is as follows: the exhaust end of the compressor 12 is connected to the port a of the four-way valve 141, the suction end of the compressor 12 is connected to the port c of the four-way valve 141, the port b of the four-way valve 141 is connected to a port of the outdoor heat exchanger 11, and the port d of the four-way valve 141 is connected to the port a of the second reversing valve 42. Another port of the outdoor heat exchanger 11 is connected to the throttle valve 142, and the throttle valve 142 is further connected to the port a of the first reversing valve 41, and the port b of the first reversing valve 41 is connected to the port of the third heat exchanger 31 on the humidifier 3, and another port of the third heat exchanger 31 is connected to the port b of the second reversing valve 42, and the port c of the first reversing valve 41 is connected to the port of the indoor heat exchanger 2, and another port of the indoor heat exchanger 2 is connected to the port c of the second reversing valve 42.

[0025] When cooling in summer, the humidity of the air in the building is first adjusted using the humidifier 3. Generally, the humidity in the building 6 needs to be controlled at about 40%. Then the refrigerant circulates in the indoor heat exchanger 2. The indoor heat exchanger 2 exchanges heat with the floor concrete layer. The concrete or the floor tile floor above exchanges heat with the air in the building to achieve indoor cooling. Figure 3 As shown, when the humidifier 3 is used, the refrigerant is discharged from the exhaust port of the compressor 12 into the port a of the four-way valve 141, and flows out from the port b of the four-way valve into the outdoor heat exchanger 11, and after heat exchange with the ambient air outside the building, enters the throttle valve 142 for throttling expansion and flows out from the port b of the reversing valve through the port a of the reversing valve into the third heat exchanger 31, and heat exchange and dehumidification are carried out with the air in the building, and the formed condensed water flows into the receiving plate 33. Then, the refrigerant circulates to the port b of the second reversing valve 42, flows out from the port a of the second reversing valve 42 into the port d of the four-way valve, and finally flows into the suction port of the compressor 12 from the port c of the four-way valve, thereby forming a heat exchange and dehumidification cycle between the outdoor unit 1 and the humidifier 3.

[0026] When the humidity controller 3 adjusts the air humidity to the required threshold, no refrigerant circulates in the third heat exchanger 31, and the refrigerant enters the indoor heat exchanger 2 for circulating heat exchange. Figure 4As shown, the refrigerant is discharged from the exhaust port of the compressor 12 into the port a of the four-way valve 141, and flows out from the port b of the four-way valve into the outdoor heat exchanger 11 to exchange heat with the ambient air outside the building 6. Since the temperature of the refrigerant is relatively low, even after heat transfer through the concrete, the temperature of the contact surface between the ground and the air in the building is still lower than the air temperature in the building 6. After heat exchange, the air temperature in the building is reduced, and refrigeration is achieved. Then, the refrigerant enters the throttle valve 142 for throttling expansion and passes through the port a of the first reversing valve 41, and flows out from the port c of the first reversing valve 41 into the indoor heat exchanger 2. The indoor heat exchanger 2 is pre-buried in the concrete layer of the floor slab and exchanges heat with it, and exchanges heat with the air in the building through the concrete layer. After heat exchange, the refrigerant circulates to the port c of the second reversing valve 42 and flows out from the port a of the second reversing valve 42 into the port d of the four-way valve, and flows into the suction port of the compressor 12 from the port c of the four-way valve, thereby forming a heat exchange refrigeration cycle between the outdoor unit 1 and the indoor heat exchanger 2.

[0027] Since the surface temperature of the heat exchanger 31 is much different from the air humidity in the building, the moisture in the air in the building condenses on the heat exchanger 31, thereby reducing the air humidity in the building 6 and preventing condensation from appearing on the floor of the building 6 when the indoor heat exchanger 2 is turned on. At the same time, the refrigerant provided by the same outdoor unit 1 flows through the humidifier 3 and the indoor heat exchanger 2, but since the indoor heat exchanger 2 is pre-buried in the concrete layer of the floor, and there is ground on the concrete layer, thermal resistance will be formed, so the temperature of the heat exchange surface where the ground contacts the air is higher than the temperature of the refrigerant in the indoor heat exchanger 2. After condensation and dehumidification by the humidifier 3, even if there is refrigerant heat exchange circulation in the indoor heat exchanger 2, it will not cause condensation on the contact surface between the ground and the air in the building.

[0028] When heating is needed in winter, Figure 5 As shown, the refrigerant is discharged from the exhaust port of the compressor 12, enters the port a of the four-way valve 141, flows out from the port d of the four-way valve into the port a of the second reversing valve 42, and further flows into the indoor heat exchanger 2. As mentioned above, the indoor heat exchanger 2 is pre-buried in the concrete layer of the floor slab and exchanges heat with it, and exchanges heat with the air in the building through the ground on the concrete layer. At this time, due to the high temperature of the refrigerant, even after heat transfer through the concrete, the temperature of the contact surface between the ground and the air in the building 6 is higher than the air temperature in the building 6. After heat exchange, the air temperature in the building rises, and heating is achieved. Then, the refrigerant flows out from the indoor heat exchanger 2 to the port c of the first reversing valve 41 and flows out from the port a, enters the throttle valve 142 for throttling expansion, and exchanges heat with the external ambient air in the outdoor heat exchanger 11, and then flows into the port b of the four-way valve 141 and flows into the suction port of the compressor 12 from the port c of the four-way valve 141, thereby forming a heat exchange heating cycle between the outdoor unit 1 and the indoor heat exchanger 2.

[0029] The climate is relatively dry in winter, and people feel even hotter and dryer after heating, so the air in the building can also be humidified. Clean water is placed in the receiving tray 33 of the humidifier 3, and part of the pipeline of the third heat exchanger 31 is immersed in the water of the receiving tray 33. Therefore, when the refrigerant circulates in the third heat exchanger 33, the water in the receiving tray 33 can be heated and the evaporation of water into the air can be increased, thereby increasing the humidity in the building. This type of heating does not produce a lot of water vapor like an ordinary humidifier and affect the objects placed around it, but humidifies in a trace amount for a long time, and the human body will feel more comfortable. Specifically, Figure 6 As shown, the refrigerant is discharged from the exhaust port of the compressor 12 into the port a of the four-way valve 141, and flows out from the port d of the four-way valve into the port a of the second reversing valve 42, and flows out from the port b of the first reversing valve 41 to enter the third heat exchanger 31. At this time, the heat exchanger can directly exchange heat with the air in the building to increase the temperature in the building, and also exchange heat with the water in the receiving plate 33 to increase the temperature in the receiving plate 33, increase the evaporation amount of the water in the receiving plate 33, and increase the humidity in the building 6. After heat exchange, the refrigerant flows out from the third heat exchanger 31 to the port b of the first reversing valve 41 and flows out from the port a, enters the throttle valve 142 for throttling expansion, and then exchanges heat with the ambient air outside the building in the outdoor heat exchanger 11, flows into the port b of the four-way valve 141, and flows into the suction port of the compressor 12 from the port c of the four-way valve 141, thereby forming a heat exchange and humidification cycle between the outdoor unit 1 and the indoor heat exchanger 2.

[0030] When the humidifier 3 is humidifying or dehumidifying, the heat exchange area of ​​the third heat exchanger 31 is small, and even after the fan is installed, the heat exchange amount of the humidifier 3 is relatively small, so it is necessary to adjust the operating frequency of the compressor 12 to meet the operating load of the humidifier 3. In order to further increase the humidity adjustment ability of the humidifier 3, a fan 33 can be added to the humidifier 3 to slightly disturb the air in the building. However, the cooling and heating heat exchange in the building 6 mainly depends on the indoor heat exchanger 2 instead of the third heat exchanger 31. Therefore, the fan 33 generates very small airflow and low noise. Its main functions are:

[0031] (1) When cooling in summer, considering that the cold air has a high density and sinks, the cold air after heat exchange between the ground and the air in the building sinks to the ground. At this time, although the humidifier 3 does not have a refrigerant circulation, the fan 33 can blow out a breeze to disturb the cold air sinking to the ground, thereby forming an air flow circulation within a height range of 0.6-1.2 meters to meet the temperature sensory requirements;

[0032] (2) When humidifying in winter, the humidifier 3 has no refrigerant circulation, but the fan 33 can blow out a breeze. At this time, there is still heated water in the receiving plate 33, which increases the disturbance on the surface of the receiving plate 33 and thus increases the evaporation of water, ensuring uniform humidity in the building.

[0033] From the above, we can see that Figure 2 The embodiment shown can only realize the intermediate function between the third heat exchanger 31 and the indoor heat exchanger 2. Figure 9-10 As shown, the third heat exchanger 31 and the indoor heat exchanger 2 can be operated simultaneously by adding a valve. Fig. 9 In the illustrated embodiment, a first connecting valve 43 may be further provided between the pipeline connecting the indoor heat exchanger 2 and the first reversing valve 41 and the pipeline connecting the third heat exchanger 31 and the second reversing valve 42. The third heat exchanger 31 and the indoor heat exchanger 2 may be connected in series by controlling the first connecting valve 43 and the second reversing valve 42. Taking the cooling state as an example, the refrigerant flows into the four-way valve 141 from the compressor exhaust port a and flows out from the port b of the four-way valve 141 to enter the outdoor heat exchanger 11, and enters the throttle valve 142 after heat exchange with the ambient air outside the house. After throttling expansion, the refrigerant flows in from the port a of the first reversing valve 41 and flows out from the port b, enters the third heat exchanger 31 to exchange heat with the air in the house, and then flows into the indoor heat exchanger 2 through the first connecting valve 43. After heat exchange with the air in the house through the indoor heat exchanger 2, the refrigerant flows to the port c of the second reversing valve 42 and flows out from the port a, and then flows into the port c from the port d of the four-way valve 141, and flows back to the suction port of the compressor, thereby forming a refrigeration cycle.

[0034] exist Fig.10 In the illustrated embodiment, a third connecting valve 45 is provided on the pipeline connecting the indoor heat exchanger 2 and the port b of the first reversing valve 41, and a second connecting valve 44 is provided on the pipeline connecting the indoor heat exchanger 2 and the port b of the second reversing valve 42. In the cooling state, the refrigerant flows into the four-way valve 141 from the exhaust port a of the compressor and flows out from the port b of the four-way valve 141 to enter the outdoor heat exchanger 11, and enters the throttle valve 142 after heat exchange with the ambient air outside the house, and after throttling expansion, the refrigerant flows in from the port a of the first reversing valve 41 and flows out from the port b. At this time, the refrigerant is divided into two paths, one path enters the third heat exchanger 31, and after the third heat exchanger 31 exchanges heat with the air in the room, it flows to the port b of the second reversing valve 42; the other path of refrigerant enters the indoor heat exchanger 2 through the third connecting valve 45, and after exchanging heat with the air in the room through the indoor heat exchanger 2, it flows through the second connecting valve 44 and also flows to the port b of the second reversing valve 42. The two paths of refrigerant converge at the port b of the second reversing valve 42, flow out from the port a, flow into the port d of the four-way valve 141, and flow out from the port c, and flow back to the suction port of the compressor, thereby forming a refrigeration cycle.

[0035] Although the implementation methods disclosed in this application are as above, the contents described are only implementation methods adopted for facilitating the understanding of this application, and are not intended to limit this application. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. An air conditioning system, characterized in that: It includes an outdoor unit, an indoor heat exchanger and a humidifier. The outdoor unit includes an outdoor heat exchanger and a compressor connected to each other. The outdoor heat exchanger and the compressor, as well as the indoor heat exchanger and the compressor are connected through a four-way valve. The humidifier is provided with a third heat exchanger. A first reversing valve is connected between the outdoor heat exchanger and the third heat exchanger, and the indoor heat exchanger is connected to the first reversing valve. A second reversing valve is also provided between the four-way valve and the indoor heat exchanger, and the third heat exchanger is connected to the second reversing valve.

2. The air conditioning system according to claim 1, characterized in that: A throttle valve is provided between the outdoor heat exchanger and the first reversing valve; the exhaust end of the compressor is connected to the port a of the four-way valve, the suction end of the compressor is connected to the port c of the four-way valve, the port b of the four-way valve is connected to a port of the outdoor heat exchanger, and the port d of the four-way valve is connected to the port a of the second reversing valve; the other port of the outdoor heat exchanger is connected to the throttle valve, the throttle valve is connected to the port a of the first reversing valve, the port b of the first reversing valve is connected to the port of the third heat exchanger on the humidifier, the other port of the third heat exchanger is connected to the port b of the second reversing valve, the port c of the first reversing valve is connected to the port of the indoor heat exchanger, and the other port of the indoor heat exchanger is connected to the port c of the second reversing valve.

3. The air conditioning system according to claim 1 or 2, characterized in that: A control unit is also provided, and at least one of a temperature sensor and a humidity sensor is connected to the control unit.

4. The air conditioning system according to claim 3, characterized in that: At least one of the temperature sensor and the humidity sensor is arranged within a height range of 0.6-1.2 meters from the ground.

5. The air conditioning system according to claim 3, characterized in that: The control unit is connected to the outdoor unit, the indoor heat exchanger, and the humidifier.

6. The air conditioning system according to any one of claims 1-2, 4-5, characterized in that: The humidifier is also provided with a fan.

7. The air conditioning system according to claim 6, characterized in that: The humidifier is further provided with a receiving tray, and at least a portion of the third heat exchanger is immersed in water in the receiving tray.

8. The air conditioning system according to claim 2, characterized in that: A first connecting valve is further provided between the pipeline connecting the indoor heat exchanger and the first reversing valve and the pipeline connecting the third heat exchanger and the second reversing valve, and the indoor heat exchanger is connected in series with the third heat exchanger.

9. The air conditioning system according to claim 2, characterized in that: A third connecting valve is provided on the pipeline connecting the indoor heat exchanger to port b of the first reversing valve, a second connecting valve is provided on the pipeline connecting the indoor heat exchanger to port b of the second reversing valve, and the indoor heat exchanger is connected in parallel with the third heat exchanger.

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