Air conditioning system and control method

Abstract

The invention provides an air conditioning system and a control method, the air conditioning system comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is provided with an air inlet side and an air outlet side which are oppositely arranged, the second heat exchanger is arranged on the air outlet side of the first heat exchanger, and the air conditioning system has a constant temperature dehumidification mode, a refrigeration mode and a heating mode; when the air conditioning system is in a constant-temperature dehumidification mode, the first heat exchanger is in an evaporation heat absorption state, and the second heat exchanger is in a condensation heat release state; when the air conditioning system is in a refrigeration mode or a heating mode, the second heat exchanger is selectively connected with the first heat exchanger in parallel, the first heat exchanger is in an evaporation heat absorption state or a condensation heat release state, and the second heat exchanger is selectively in the evaporation heat absorption state or the condensation heat release state. By means of the technical scheme, the technical problem that in the prior art, an auxiliary heat exchanger of an air conditioner with the constant-temperature dehumidification function cannot be reasonably utilized can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning systems, and in particular to an air-conditioning system and a control method thereof. Background Art

[0002] Currently, in the field of air conditioning technology, especially in multi-split air conditioning systems used in residential and commercial buildings, constant temperature dehumidification functions are often available to meet specific seasonal needs, such as dehumidification during the rainy season. This function is typically achieved by adding a secondary heat exchanger to the air conditioner's indoor unit. In constant temperature dehumidification mode, the secondary heat exchanger introduces high-temperature refrigerant, reheating the air that has passed through the main heat exchanger to achieve constant temperature dehumidification.

[0003] However, in existing constant-temperature dehumidification air conditioning systems, the auxiliary heat exchanger is often idle and not effectively utilized in cooling or heating mode. Specifically, when the air conditioning system is in cooling mode, to prevent the high-temperature refrigerant in the auxiliary heat exchanger from further heating the already cooled air, resulting in a high outlet temperature and affecting the cooling effect, the electronic expansion valve connected to the auxiliary heat exchanger is usually closed, so that the auxiliary heat exchanger does not participate in the refrigeration cycle. This causes the auxiliary heat exchanger to be idle and cannot be effectively and reasonably utilized. In addition, this practice results in the heat exchange area of ​​the auxiliary heat exchanger not being fully utilized, thereby affecting the overall cooling efficiency. Summary of the Invention

[0004] The main purpose of the present invention is to provide an air conditioning system and a control method to solve the technical problem in the prior art that the auxiliary heat exchanger of the air conditioner with constant temperature dehumidification function cannot be reasonably utilized.

[0005] In order to achieve the above object, according to one aspect of the present invention, an air conditioning system is provided, comprising:

[0006] a first heat exchanger and a second heat exchanger, wherein the first heat exchanger has an air inlet side and an air outlet side arranged opposite to each other, and the second heat exchanger is arranged on the air outlet side of the first heat exchanger, and the air conditioning system has a constant temperature dehumidification mode, a cooling mode, and a heating mode;

[0007] When the air conditioning system is in the constant temperature dehumidification mode, the first heat exchanger is in an evaporation heat absorption state, and the second heat exchanger is in a condensation heat release state;

[0008] When the air-conditioning system is in the cooling mode or the heating mode, the second heat exchanger can be optionally arranged in parallel with the first heat exchanger, the first heat exchanger is in an evaporation heat absorption state or a condensation heat release state, and the second heat exchanger can be optionally in an evaporation heat absorption state or a condensation heat release state.

[0009] Furthermore, the air conditioning system further comprises:

[0010] A first electronic expansion valve is provided in series with the first heat exchanger, and a flow rate of the first electronic expansion valve is adjustably set;

[0011] A second electronic expansion valve is provided in series with the second heat exchanger;

[0012] When the air conditioning system is in the constant temperature dehumidification mode, the second electronic expansion valve is closed; when the air conditioning system is in the refrigeration mode and the heating mode, the second electronic expansion valve is adjustably set.

[0013] Further, the air conditioning system further comprises:

[0014] A first heat exchange pipeline has a first communication port and a second communication port, and the first heat exchanger is provided on the first heat exchange pipeline;

[0015] A second heat exchange pipeline has a third communication port and a fourth communication port, and the second heat exchanger is provided on the second heat exchange pipeline;

[0016] A heat exchange main pipeline, a compressor and an outdoor heat exchanger are provided on the heat exchange main pipeline, the heat exchange main pipeline has a first heat exchange port and a second heat exchange port, the first communication port and the third communication port are in communication with the first heat exchange port, the second communication port is in communication with the second heat exchange port, and the fourth communication port is selectively in communication with one of the second heat exchange port and the second communication port.

[0017] Further, the air conditioning system further comprises:

[0018] A communication pipeline has a first connection port and a second connection port, the first connection port is in communication with the second communication port, and the second connection port is in communication with the fourth communication port;

[0019] A switch valve is connected to at least part of the communication pipeline, and the switch valve has a first switching state and a second switching state;

[0020] When the switch valve is in the first switching state, the fourth communication port is in communication with the second heat exchange port and is disconnected from the second communication port;

[0021] When the switch valve is in the second switching state, the fourth communication port is disconnected from the second heat exchange port and is in communication with the second communication port.

[0022] Further, the switch valve is a three-way valve, the three-way valve has a first switching port, a second switching port and a third switching port, the first switching port is connected with the second heat exchange port, the second switching port is connected with the fourth communication port, and the third switching port is connected with the third communication port.

[0023] The switch valve comprises a first valve and a second valve, the first valve is arranged on the communication pipeline, and the second valve is arranged on the second heat exchange pipeline.

[0024] Further, the air conditioning system further comprises:

[0025] A first temperature detection member and a second temperature detection member, the first temperature detection member and the second temperature detection member are arranged at two connection ends of the first heat exchanger respectively; and / or,

[0026] A third temperature detection member and a fourth temperature detection member, the third temperature detection member and the fourth temperature detection member are arranged at two connection ends of the second heat exchanger respectively; and / or,

[0027] A fifth temperature detection member, arranged at an air outlet side of the first heat exchanger.

[0028] According to another aspect of the present application, a control method is provided, which is suitable for the above-mentioned air conditioning system, and the control method comprises:

[0029] Obtaining the operation mode of the air conditioning system;

[0030] Adjusting the connection mode and the operation state of the second heat exchanger of the air conditioning system according to the operation mode of the air conditioning system;

[0031] The operation state comprises an evaporation heat absorption state and a condensation heat release state, and the connection mode of the second heat exchanger comprises that the second heat exchanger is connected in parallel with the first heat exchanger of the air conditioning system or the second heat exchanger is disconnected to stop operation.

[0032] Further, the adjusting the connection mode and the operation state of the second heat exchanger according to the operation mode of the air conditioning system comprises:

[0033] Obtaining the outdoor environment temperature, the indoor environment temperature and the user set temperature;

[0034] Adjusting the connection mode and the operation state of the second heat exchanger according to the operation mode of the air conditioning system, the outdoor environment temperature, the indoor environment temperature and the user set temperature.

[0035] Further, the adjusting the connection mode and the operation state of the second heat exchanger according to the operation mode of the air conditioning system, the outdoor environment temperature, the indoor environment temperature and the user set temperature comprises:

[0036] in the case that the air conditioning system is in the cooling mode;

[0037] when the outdoor environment temperature is less than or equal to a first preset temperature value, controlling the second heat exchanger to be disconnected to stop operation;

[0038] when the outdoor environment temperature is greater than a second preset temperature value, controlling the second heat exchanger to be connected in parallel with the first heat exchanger;

[0039] when the outdoor environment temperature is greater than the first preset temperature and less than or equal to the second preset temperature, adjusting the connection relationship of the second heat exchanger according to the temperature difference between the indoor environment temperature and the user set temperature.

[0040] Further, the adjusting the connection relationship of the second heat exchanger according to the temperature difference between the indoor environment temperature and the user set temperature comprises:

[0041] when the temperature difference between the indoor environment temperature and the user set temperature is greater than or equal to a preset temperature difference value, controlling the first heat exchanger to be connected in parallel with the second heat exchanger;

[0042] when the temperature difference between the indoor environment temperature and the user set temperature is less than the preset temperature difference value, controlling the second heat exchanger to be disconnected to stop operation.

[0043] Further, the adjusting the connection mode and the operation state of the second heat exchanger according to the operation mode of the air conditioning system, the outdoor environment temperature, the indoor environment temperature and the user set temperature comprises:

[0044] in the case that the air conditioning system is in the heating mode;

[0045] when the outdoor environment temperature is greater than or equal to a third preset temperature value, controlling the second heat exchanger to be disconnected to stop operation;

[0046] when the outdoor environment temperature is less than a fourth preset temperature value, controlling the second heat exchanger to be connected in parallel with the first heat exchanger;

[0047] when the outdoor environment temperature is greater than or equal to the fourth preset temperature and less than or equal to the third preset temperature, adjusting the connection relationship of the second heat exchanger according to the temperature difference between the indoor environment temperature and the user set temperature.

[0048] Further, the adjusting the connection relationship of the second heat exchanger according to the temperature difference between the indoor environment temperature and the user set temperature comprises:

[0049] when the indoor environment temperature is greater than or equal to the user set temperature, controlling the second heat exchanger to be disconnected to stop running;

[0050] when the indoor environment temperature is less than the user set temperature, controlling the second heat exchanger to be connected in parallel with the first heat exchanger.

[0051] Further, in the case that the air conditioning system is in the cooling mode or the heating mode, the control method further comprises:

[0052] controlling the first electronic expansion valve connected in series with the first heat exchanger to be at maximum opening, and the second electronic expansion valve connected in series with the second heat exchanger to be closed;

[0053] obtaining a first actual supercooling degree of the first heat exchanger;

[0054] adjusting the opening of the first electronic expansion valve and / or the opening of the second electronic expansion valve according to the first actual supercooling degree of the first heat exchanger.

[0055] Further, the adjusting the opening of the first electronic expansion valve and / or the opening of the second electronic expansion valve according to the first actual supercooling degree of the first heat exchanger comprises:

[0056] determining whether the first actual supercooling degree of the first heat exchanger is within a target supercooling degree range;

[0057] when the first actual supercooling degree of the first heat exchanger is greater than a maximum value of the target supercooling degree range, gradually reducing the opening of the first electronic expansion valve to gradually reduce the first actual supercooling degree of the first heat exchanger to be within the target supercooling degree range;

[0058] when the first actual supercooling degree of the first heat exchanger is less than a minimum value of the target supercooling degree range, gradually increasing the opening of the second electronic expansion valve to gradually increase the first actual supercooling degree of the first heat exchanger to be within the target supercooling degree range.

[0059] The technical scheme of the application is applied to the air conditioning system in the refrigeration mode or the heating mode, the second heat exchanger is selectively arranged in parallel with the first heat exchanger, the first heat exchanger is in the evaporation heat absorption state or the condensation heat release state, and the second heat exchanger is selectively in the evaporation heat absorption state or the condensation heat release state, so that the second heat exchanger is fully utilized. In addition, by introducing the three-way valve and the intelligent control of the electronic expansion valve, the second heat exchanger is flexibly utilized in different operation modes, the dehumidification effect is ensured in the constant temperature dehumidification mode, and the participation degree of the second heat exchanger is dynamically adjusted according to the outdoor temperature and the indoor load demand in the refrigeration and heating modes, so that the refrigeration and heating efficiencies are significantly improved. In addition, by accurately controlling the opening degree of the electronic expansion valve, the stable operation of the system in different modes is ensured, the abnormal air outlet temperature and the energy waste are avoided, so that the user comfort is met, the energy is efficiently utilized, and remarkable energy-saving and environmental protection benefits are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0060] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, explain the application. The detailed description of the application and its examples serve to explain the application without limiting it. In the drawings:

[0061] Figure 1 A refrigerant flow direction schematic diagram of an air conditioning system in a refrigeration mode is shown according to an embodiment of the application;

[0062] Figure 2 A refrigerant flow direction schematic diagram of an air conditioning system in a heating mode is shown according to an embodiment of the application;

[0063] Figure 3 A refrigerant flow direction schematic diagram of an air conditioning system in a constant temperature dehumidification mode is shown according to an embodiment of the application;

[0064] Figure 4 A control method flow chart of an air conditioning system in a refrigeration mode is shown according to an embodiment of the application;

[0065] Figure 5 A control method flow chart of an air conditioning system in a heating mode is shown according to an embodiment of the application.

[0066] In the above drawings, the following reference signs are used:

[0067] 10, first heat exchanger;

[0068] 20, second heat exchanger;

[0069] 30, first electronic expansion valve;

[0070] 40, second electronic expansion valve;

[0071] 50. First heat exchange pipeline;

[0072] 51. First communication port;

[0073] 52. Second communication port;

[0074] 60. Second heat exchange pipeline;

[0075] 61. The third connecting port;

[0076] 62. Fourth connecting port;

[0077] 70. Connecting pipelines;

[0078] 80. Switch valve;

[0079] 91. First temperature detection element;

[0080] 92. Second temperature detection element;

[0081] 93. Third temperature detection element;

[0082] 94. Fourth temperature detection element;

[0083] 100. The third heat exchange pipeline. DETAILED DESCRIPTION

[0084] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0085] like Figures 1 to 3 As shown, an embodiment of the present invention provides an air conditioning system, comprising: a first heat exchanger 10 and a second heat exchanger 20. The first heat exchanger 10 has an air inlet side and an air outlet side arranged opposite each other, and the second heat exchanger 20 is arranged on the air outlet side of the first heat exchanger 10. The air conditioning system has a constant temperature dehumidification mode, a cooling mode, and a heating mode. When the air conditioning system is in the constant temperature dehumidification mode, the first heat exchanger 10 is in an evaporation heat absorption state, and the second heat exchanger 20 is in a condensation heat release state. When the air conditioning system is in the cooling mode or the heating mode, the second heat exchanger 20 can be optionally arranged in parallel with the first heat exchanger 10, and the first heat exchanger 10 is in an evaporation heat absorption state or a condensation heat release state, and the second heat exchanger 20 can be selectively in an evaporation heat absorption state or a condensation heat release state.

[0086] When the air conditioning system is in the cooling mode, the second heat exchanger 20 can be arranged in parallel with the first heat exchanger 10, the first heat exchanger 10 is in the evaporative heat absorption state, and the second heat exchanger 20 can also be in the evaporative heat absorption state, so that the second heat exchanger 20 can be selectively utilized in the cooling mode. When the air conditioning system is in the heating mode, the second heat exchanger 20 can be arranged in parallel with the first heat exchanger 10, the first heat exchanger 10 is in the condensing heat release state, and the second heat exchanger 20 can also be in the condensing heat release state, so that the first heat exchanger 10 can be selectively utilized in the heating mode. The above method can avoid the situation that the second heat exchanger 20 is idle and cannot be utilized in the cooling mode or the heating mode, and improves the utilization rate of the second heat exchanger 20. Specifically, the first heat exchanger 10 in the embodiment can also be understood as a main heat exchanger, and the second heat exchanger 20 can also be understood as a secondary heat exchanger. Therefore, the air conditioning system provided in the embodiment can solve the technical problem that the secondary heat exchanger of the air conditioner with the constant temperature dehumidification function in the prior art cannot be reasonably utilized.

[0087] In the embodiment, the air conditioning system further comprises a first electronic expansion valve 30 and a second electronic expansion valve 40. The first electronic expansion valve 30 is arranged in series with the first heat exchanger 10, and the flow rate of the first electronic expansion valve 30 is adjustably arranged. The second electronic expansion valve 40 is arranged in series with the second heat exchanger 20. When the air conditioning system is in the constant temperature dehumidification mode, the second electronic expansion valve 40 is closed. When the air conditioning system is in the cooling mode and the heating mode, the flow rate of the second electronic expansion valve 40 is adjustably arranged. With such an arrangement, the flow rate of the refrigerant can be accurately controlled by arranging the first electronic expansion valve 30 and the second electronic expansion valve 40, and the heat exchange efficiency of the heat exchanger can be adjusted. In this way, it can be ensured that the temperature control of the air conditioning system is more accurate by controlling the first electronic expansion valve 30 and the second electronic expansion valve 40 in different modes, and the user comfort is improved. In other embodiments, other types of flow control valves, such as electric proportional valves, can also be used to solve the technical problem of insufficient response speed or accuracy of the electronic expansion valve under certain conditions.

[0088] Specifically, the air conditioning system further comprises: a first heat exchange pipeline 50, a second heat exchange pipeline 60, a heat exchange main pipeline, a compressor and an outdoor heat exchanger, the first heat exchange pipeline 50 has a first communication port 51 and a second communication port 52, the first heat exchanger 10 is arranged on the first heat exchange pipeline 50; the second heat exchange pipeline 60 has a third communication port 61 and a fourth communication port 62, the second heat exchanger 20 is arranged on the second heat exchange pipeline 60. The compressor and the outdoor heat exchanger are arranged on the heat exchange main pipeline, the heat exchange main pipeline has a first heat exchange port and a second heat exchange port, the first communication port 51 and the third communication port 61 are both in communication with the first heat exchange port, the second communication port 52 is in communication with the second heat exchange port, and the fourth communication port 62 is selectively in communication with one of the second heat exchange port and the second communication port 52. Through the design of the pipeline, the smooth flow of refrigerant in the system is ensured, and a physical basis for switching of the second heat exchanger 20 is provided. By controlling the selective communication mode of the fourth communication port 62, switching of the second heat exchanger 20 between the evaporation heat absorption state and the condensation heat release state can be realized. In this way, the second heat exchanger 20 can be fully and flexibly utilized in different modes of the air conditioning system, and the overall energy efficiency is improved.

[0089] Specifically, the first heat exchange pipeline 50 is a high-pressure gas pipeline, and the second heat exchange pipeline 60 is a gas pipeline. The air conditioning system further comprises a third heat exchange pipeline 100, which is a liquid pipeline. The third heat exchange pipeline 100 is arranged between the exhaust port of the compressor and the first expansion valve and the second expansion valve.

[0090] In the embodiment, the air conditioning system further comprises: a communication pipeline 70 and a switch valve 80, the communication pipeline 70 has a first connection port and a second connection port, the first connection port is in communication with the second communication port 52, and the second connection port is in communication with the fourth communication port 62; the switch valve 80 is connected with at least part of the communication pipeline 70, and the switch valve 80 has a first switching state and a second switching state. When the switch valve 80 is in the first switching state, the fourth communication port 62 is in communication with the second heat exchange port and is disconnected from the second communication port 52; when the switch valve 80 is in the second switching state, the fourth communication port 62 is disconnected from the second heat exchange port and is in communication with the second communication port 52. The arrangement of the communication pipeline 70 and the switch valve 80 provides a flexible control means for switching of the second heat exchanger 20. The switch valve 80 controls the flow direction of the refrigerant by changing the communication path inside the switch valve 80. In this way, the second heat exchanger 20 can be effectively utilized in the cooling mode or the heating mode, and the cooling or heating capacity of the air conditioning system is enhanced. In other embodiments, an electromagnetic valve or other types of valves can also be used to solve the technical problems of slow response speed or low reliability of the switch valve 80 under high load conditions.

[0091] In one embodiment, the on-off valve 80 is a three-way valve having a first switching port, a second switching port, and a third switching port. The first switching port is connected to the second heat exchange port, the second switching port is connected to the fourth communication port 62, and the third switching port is connected to the third communication port 61. Thus, by switching the communication relationship of the three-way valve, precise control of the second heat exchanger 20 can be improved, ensuring more effective and rational utilization of the second heat exchanger 20 in different modes, thereby avoiding unnecessary energy consumption.

[0092] Specifically, the setting of the three-way valve can change the flow direction of the refrigerant, and can effectively control the second heat exchanger 20 to perform heat exchange or stop operation when the load demand is large in the cooling mode or heating mode, so as to increase the flexibility of the use of the second heat exchanger 20. In addition, when the second heat exchanger 20 is in use, it can effectively increase the heat exchange area and enhance the heat exchange effect.

[0093] In another embodiment, the on-off valve 80 includes a first valve and a second valve, wherein the first valve is disposed on the connecting pipe 70, and the second valve is disposed on the second heat exchange pipe 60. Thus, the coordination of the on-off operation of the first and second valves facilitates more precise control of the second heat exchanger 20, ensuring more effective and rational utilization of the second heat exchanger 20 in different modes, thereby avoiding unnecessary energy consumption.

[0094] Specifically, the air-conditioning system further includes: a first temperature detection component 91 and a second temperature detection component 92, wherein the first temperature detection component 91 and the second temperature detection component 92 are respectively arranged at the two connection ends of the first heat exchanger 10. The arrangement of the first temperature detection component 91 and the second temperature detection component 92 provides real-time monitoring data for the temperature control of the air-conditioning system. The temperature detection components can sense the temperature changes at both ends of the heat exchanger to detect the first actual supercooling degree of the first heat exchanger 10, thereby providing a basis for adjusting the first electronic expansion valve 30. This can also ensure that the temperature control of the air-conditioning system is more accurate in different modes, thereby improving user comfort.

[0095] Specifically, the air conditioning system further includes: a third temperature detection component 93 and a fourth temperature detection component 94, which are respectively arranged at the two connection ends of the second heat exchanger 20. The arrangement of the third temperature detection component 93 and the fourth temperature detection component 94 provides real-time monitoring data for the temperature control of the air conditioning system. The temperature detection components can sense temperature changes at both ends of the heat exchanger to detect the second actual supercooling degree of the second heat exchanger 20, thereby providing a basis for adjusting the second electronic expansion valve 40. This also ensures that the temperature control of the air conditioning system is more precise in different modes, improving user comfort.

[0096] Specifically, the air conditioning system further comprises a fifth temperature detection member arranged at the air outlet side of the first heat exchanger 10. In this way, the temperature of the air outlet can be accurately determined in combination with the temperature of the air outlet side of the first heat exchanger 10, and the first electronic expansion valve 30 and the second electronic expansion valve 40 can be comprehensively controlled in combination with the size of the air outlet temperature. Specifically, the first electronic expansion valve 30 and the second electronic expansion valve 40 can be comprehensively controlled by combining the size of the air outlet temperature, the user-set temperature, and the outdoor temperature, thereby improving the control accuracy of the first electronic expansion valve 30 and the second electronic expansion valve 40.

[0097] Embodiment two of the present application provides a control method suitable for the air conditioning system provided above, the control method comprising: obtaining the operation mode of the air conditioning system; adjusting the connection mode and the operation state of the second heat exchanger 20 of the air conditioning system according to the operation mode of the air conditioning system; wherein the operation state comprises an evaporation heat absorption state and a condensation heat release state, and the connection mode of the second heat exchanger 20 comprises that the second heat exchanger 20 is connected in parallel with the first heat exchanger 10 of the air conditioning system or the second heat exchanger 20 is disconnected to stop operation.

[0098] By using the control method of the present embodiment, the connection mode and the operation state of the second heat exchanger 20 are dynamically adjusted by detecting the current operation mode of the air conditioning system, thereby realizing intelligent control of the system to better meet the use requirements of users and improve the use rate of the second heat exchanger 20 and increase the flexibility of use of the second heat exchanger 20.

[0099] Specifically, in some embodiments, the control method can automatically switch the working mode of the second heat exchanger 20 by cooperating the electronic expansion valve and the on-off valve 80 based on the preset temperature threshold and the user-set temperature. By using the control method provided in the present embodiment, the heat exchanger can be reasonably utilized according to the actual load demand in different modes, thereby improving the system energy efficiency and user comfort. In other embodiments, other control parameters such as humidity, wind speed, etc. can be introduced to solve the limitations that may exist in temperature control only in a specific environment.

[0100] Specifically, to reasonably utilize the heat exchange area of the first heat exchanger 10 and the second heat exchanger 20, the second heat exchanger 20 can be switched to use, the first heat exchanger 10 and the second heat exchanger 20 simultaneously exchange heat when the load demand is large, and the second heat exchanger 20 is closed and the first heat exchanger 10 exchanges heat alone when the load demand is small, thereby meeting the user comfort while saving energy and electricity.

[0101] In the embodiment, the adjusting the connection mode and the operation state of the second heat exchanger 20 according to the operation mode of the air conditioning system comprises: acquiring an outdoor environment temperature, an indoor environment temperature and a user set temperature; and adjusting the connection mode and the operation state of the second heat exchanger 20 according to the operation mode of the air conditioning system, the outdoor environment temperature, the indoor environment temperature and the user set temperature. By introducing the outdoor environment temperature and the indoor environment temperature as control parameters, the environmental adaptability and the control accuracy of the control method are improved. The control method dynamically adjusts the connection mode and the operation state of the second heat exchanger 20 based on the real-time monitoring of the outdoor and indoor temperatures and in combination with the user set temperature. In terms of effect, the technology in the embodiment can ensure that the air conditioning system is flexibly adjusted according to actual needs under different environmental conditions, thereby improving the stability and energy efficiency of system operation.

[0102] In addition, in other embodiments, the problem that temperature control alone may have in a high-humidity environment can be solved by adding detection of indoor humidity.

[0103] Specifically, the adjusting the connection mode and the operation state of the second heat exchanger 20 according to the operation mode of the air conditioning system, the outdoor environment temperature, the indoor environment temperature and the user set temperature comprises: in the case where the air conditioning system is in a cooling mode; when the outdoor environment temperature is less than or equal to a first preset temperature value, controlling the second heat exchanger 20 to be disconnected to stop operation; when the outdoor environment temperature is greater than a second preset temperature value, controlling the second heat exchanger 20 to be connected in parallel with the first heat exchanger 10; and when the outdoor environment temperature is greater than the first preset temperature and less than or equal to the second preset temperature, adjusting the connection relationship of the second heat exchanger 20 according to a temperature difference between the indoor environment temperature and the user set temperature. Specifically, when the outdoor environment temperature is less than or equal to the first preset temperature value, this state can be understood as that the outdoor environment temperature is low and the cooling capacity demand is not high, so the second heat exchanger 20 can be disconnected to avoid energy waste; when the outdoor environment temperature is greater than the second preset temperature value, this state can be understood as that the outdoor environment temperature is high and the cooling capacity demand is high, so the second heat exchanger 20 needs to be connected to perform heat exchange to increase the heat exchange area and the heat exchange effect. When the outdoor environment temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the indoor environment temperature and the user set temperature need to be comprehensively determined to further improve the control accuracy.

[0104] Specifically, the first preset temperature can be set to 28℃ and the second preset temperature can be set to 40℃.

[0105] By setting the different temperature thresholds, the embodiment realizes intelligent control of the second heat exchanger 20 in the cooling mode. The control method automatically adjusts the connection state of the second heat exchanger 20 based on changes in the outdoor environment temperature to adapt to different load requirements. The technology in the embodiment can ensure that in the cooling mode, the air conditioning system reasonably utilizes the heat exchanger according to the environment temperature and user demand, improves the cooling efficiency and user comfort. In other embodiments, the problem of reduced cooling efficiency in a high-humidity environment can also be solved by introducing indoor humidity as a control parameter.

[0106] Specifically, the adjustment of the connection relationship of the second heat exchanger 20 according to the temperature difference between the indoor environment temperature and the user set temperature includes: when the temperature difference between the indoor environment temperature and the user set temperature is greater than or equal to a preset temperature difference value, controlling the first heat exchanger 10 and the second heat exchanger 20 to be connected in parallel; and when the temperature difference between the indoor environment temperature and the user set temperature is less than the preset temperature difference value, controlling the second heat exchanger 20 to be disconnected to stop running. When the temperature difference between the indoor environment temperature and the user set temperature is greater than or equal to the preset temperature difference value, the corresponding cooling capacity demand is high at this time, and therefore the second heat exchanger 20 needs to be increased to increase the heat exchange area, thereby improving the heat exchange effect; when the temperature difference between the indoor environment temperature and the user set temperature is less than the preset temperature difference value, the corresponding cooling capacity demand is low at this time, and therefore the second heat exchanger 20 does not need to be increased. The above control method improves the accuracy and flexibility of the control of the second heat exchanger 20. By setting the temperature difference threshold, dynamic control of the second heat exchanger 20 in the cooling mode is realized. Specifically, the control method automatically adjusts the connection state of the second heat exchanger 20 based on the temperature difference between the indoor environment temperature and the user set temperature to adapt to different load requirements. In this way, in the cooling mode, the air conditioning system can reasonably utilize the heat exchanger according to the difference between the user set temperature and the actual indoor temperature, improve the cooling efficiency and energy saving effect. In other embodiments, the limitations of temperature difference control under complex climate conditions can also be solved by considering indoor humidity and outdoor temperature comprehensively.

[0107] The preset temperature difference value can be set to any value in 4℃ to 6℃.

[0108] In the embodiment, the adjustment of the connection mode and the operation state of the second heat exchanger 20 according to the operation mode of the air conditioning system, the outdoor environment temperature, the indoor environment temperature and the user set temperature comprises: in the case that the air conditioning system is in the heating mode; when the outdoor environment temperature is greater than or equal to a third preset temperature value, the second heat exchanger 20 is controlled to be disconnected to stop operation; when the outdoor environment temperature is less than a fourth preset temperature value, the second heat exchanger 20 is controlled to be connected in parallel with the first heat exchanger 10; when the outdoor environment temperature is greater than or equal to the fourth preset temperature and less than or equal to the third preset temperature, the connection relationship of the second heat exchanger 20 is adjusted according to the temperature difference between the indoor environment temperature and the user set temperature. When the outdoor environment temperature is greater than or equal to the third preset temperature value, it proves that the heating demand at this time is low, so the second heat exchanger 20 can be made not to participate in heat exchange; when the outdoor environment temperature is less than the fourth preset temperature value, it proves that the heating demand at this time is high, so the second heat exchanger 20 needs to participate in heating to increase the heat exchange area; when the outdoor environment temperature is greater than or equal to the fourth preset temperature and less than or equal to the third preset temperature, the demand at this time is analyzed according to the temperature difference between the indoor environment temperature and the user set temperature to comprehensively analyze the demand for heating capacity, so as to accurately determine whether the heat exchange through the second heat exchanger 20 is needed.

[0109] Specifically, the third preset temperature can be 3℃, and the fourth preset temperature can be -5℃.

[0110] Specifically, the embodiment realizes intelligent control of the second heat exchanger 20 in the heating mode by setting different temperature thresholds. The above control method automatically adjusts the connection state of the second heat exchanger 20 based on the change of the outdoor environment temperature to adapt to different load demands. In terms of effect, the technology in the embodiment can ensure that in the heating mode, the air conditioning system reasonably utilizes the heat exchanger according to the environment temperature and user demand, improves the heating efficiency and user comfort. In other embodiments, the problem that the heating efficiency may be reduced in a low humidity environment can also be solved by introducing indoor humidity as a control parameter.

[0111] In the embodiment, the adjusting the connection relationship of the second heat exchanger 20 according to the temperature difference between the indoor environment temperature and the user set temperature comprises: when the indoor environment temperature is greater than or equal to the user set temperature, controlling the second heat exchanger 20 to be disconnected to stop running; and when the indoor environment temperature is less than the user set temperature, controlling the second heat exchanger 20 to be connected in parallel with the first heat exchanger 10. The embodiment realizes the dynamic control of the second heat exchanger 20 in the heating mode by setting the temperature difference threshold. In principle, the control method automatically adjusts the connection state of the second heat exchanger 20 based on the temperature difference between the indoor environment temperature and the user set temperature to adapt to different load requirements. In terms of effects, the technology in the embodiment can ensure that in the heating mode, the air conditioning system reasonably utilizes the heat exchangers according to the difference between the user set temperature and the actual indoor temperature, thereby improving the heating efficiency and energy saving effect. In other embodiments, the limitations of temperature difference control under complex climate conditions can be solved by introducing the comprehensive consideration of outdoor temperature and indoor humidity.

[0112] Specifically, in the case that the air conditioning system is in the cooling mode or the heating mode, the control method further comprises: controlling the first electronic expansion valve 30 connected in series with the first heat exchanger 10 to be at the maximum opening, and the second electronic expansion valve 40 connected in series with the second heat exchanger 20 to be closed; obtaining the first actual supercooling degree of the first heat exchanger 10; and adjusting the opening of the first electronic expansion valve 30 and / or the opening of the second electronic expansion valve 40 according to the first actual supercooling degree of the first heat exchanger 10. By using the above method, the first heat exchanger 10 can be operated at the maximum opening to meet the cooling or heating demand as much as possible, and the opening of the first heat exchanger 10 and the opening of the second heat exchanger 20 are comprehensively controlled according to the size of the first actual supercooling degree, thereby effectively improving the accuracy of the control of the first heat exchanger 10 and the second heat exchanger 20, and effectively guaranteeing the cooling or heating demand of the user and improving the user's use comfort.

[0113] Specifically, by controlling the opening of the first electronic expansion valve 30 and the second electronic expansion valve 40, the overall heat exchange efficiency of the air conditioning system is accurately adjusted. The above control method automatically adjusts the opening of the first electronic expansion valve 30 based on the actual supercooling degree of the first heat exchanger 10, and adjusts the opening of the second electronic expansion valve 40 to meet different load requirements. In terms of effects, the technology in the embodiment can ensure that in the cooling or heating mode, the air conditioning system controls the overall heat exchange efficiency of the air conditioning system by adjusting the opening of the first electronic expansion valve 30 and the opening of the second electronic expansion valve 40, thereby improving the stability and energy efficiency of the system operation.

[0114] In addition, in other embodiments, the limitations of only relying on the supercooling degree control in a specific environment can be solved by introducing other control parameters, such as indoor humidity, wind speed, etc.

[0115] In the embodiment, the adjusting the opening degree of the first electronic expansion valve 30 and / or the opening degree of the second electronic expansion valve 40 according to the first actual supercooling degree of the first heat exchanger 10 comprises: determining whether the first actual supercooling degree of the first heat exchanger 10 is within a target supercooling degree range; when the first actual supercooling degree of the first heat exchanger 10 is greater than the maximum value of the target supercooling degree range, gradually reducing the opening degree of the first electronic expansion valve 30 to gradually reduce the first actual supercooling degree of the first heat exchanger 10 to be within the target supercooling degree range; and when the first actual supercooling degree of the first heat exchanger 10 is less than the minimum value of the target supercooling degree range, gradually increasing the opening degree of the second electronic expansion valve 40 to gradually increase the first actual supercooling degree of the first heat exchanger 10 to be within the target supercooling degree range. The embodiment realizes dynamic adjustment of the opening degree of the electronic expansion valve by setting the target supercooling degree range. In principle, the control method automatically adjusts the opening degrees of the first electronic expansion valve 30 and the second electronic expansion valve 40 based on the comparison between the actual supercooling degree of the first heat exchanger 10 and the target supercooling degree range to meet different load requirements. In terms of effects, the technology in the embodiment can ensure that in the cooling or heating mode, the air conditioning system maintains the supercooling degree of the first heat exchanger 10 within the target range by accurately controlling the opening degree of the electronic expansion valve, thereby improving the stability and energy efficiency of system operation. In other embodiments, the limitations of only relying on the supercooling degree control in a specific environment can be solved by introducing other control parameters, such as indoor humidity, wind speed, etc.

[0116] Specifically, the gradually reducing the opening degree of the first electronic expansion valve 30 can be understood as reducing a first predetermined opening degree value in each first predetermined period. The gradually increasing the opening degree of the second electronic expansion valve 40 can be understood as increasing a second predetermined opening degree value in each second predetermined period.

[0117] Specifically, when the air conditioning system is in the constant temperature dehumidification mode, the first heat exchanger 10 functions as an evaporator to perform refrigeration, the second electronic expansion valve 40 is opened, the second heat exchanger 20 is directly connected to the high-pressure gas pipe to perform constant temperature function, and the first heat exchanger 10 and the second heat exchanger 20 jointly perform the constant temperature dehumidification function. The first electronic expansion valve 30 is adjusted in the range of 0-480 pls, and the opening degree of the first electronic expansion valve 30 is controlled by the first actual superheat degree (the first actual superheat degree = the first outlet pipe temperature - the first inlet pipe temperature control, the superheat degree is controlled in the range of 1-3, the first outlet pipe temperature is detected by one of the first temperature detecting element 91 and the second temperature detecting element 92, and the first inlet pipe temperature is detected by the other of the first temperature detecting element 91 and the second temperature detecting element 92). The second electronic expansion valve 40 is adjusted in the range of 0-200 pls, and the opening degree of the second electronic expansion valve 40 is controlled to make the outlet temperature T2 = Touter ring + T1 (T1 is 20-25°C) detected by the outlet temperature bulb to meet the constant temperature state.

[0118] When the air conditioning system is in the refrigeration mode, the first electronic expansion valve 30 and the second electronic expansion valve 40 are opened, the first heat exchanger 10 and the second heat exchanger 20 jointly function as an evaporator to perform refrigeration. The first electronic expansion valve 30 is adjusted in the range of 0-480 pls, and the opening degree of the first electronic expansion valve 30 is controlled by the first actual superheat degree (the first actual superheat degree = the first outlet pipe temperature - the first inlet pipe temperature control, the superheat degree is controlled in the range of 1-3, the first outlet pipe temperature is detected by one of the first temperature detecting element 91 and the second temperature detecting element 92, and the first inlet pipe temperature is detected by the other of the first temperature detecting element 91 and the second temperature detecting element 92). The second electronic expansion valve 40 is adjusted in the range of 0-200 pls, and the opening degree of the second electronic expansion valve 40 is controlled by the second actual superheat degree (the second actual superheat degree = the second outlet pipe temperature - the second inlet pipe temperature, the superheat degree is controlled in the range of 1-3°C, the second outlet pipe temperature is detected by one of the third temperature detecting element 93 and the fourth temperature detecting element 94, and the second inlet pipe temperature is detected by the other of the third temperature detecting element 93 and the fourth temperature detecting element 94).

[0119] When the air conditioning system starts heating mode, the first electronic expansion valve 30 is opened, and the second electronic expansion valve 40 is not opened by default. According to the actual supercooling degree and the target supercooling degree adjustment, the first heat exchanger 10 and the second heat exchanger 20 can be used as a condenser together to heat. Specifically, the adjustment range of the first electronic expansion valve 30 is 0-480 pls, and the initial opening of the first electronic expansion valve 30 is set to the maximum, which is 480 pls. Then, according to the first actual supercooling degree and the target supercooling degree range value (the target supercooling degree range value is 10-20℃), the opening of the first electronic expansion valve 30 is adjusted. If the first actual supercooling degree is greater than the maximum value of the target supercooling degree, the opening of the first electronic expansion valve 30 is reduced by 20 pls every cycle until the first actual supercooling degree is within the target supercooling degree range value. If the first actual supercooling degree is less than the minimum value of the target supercooling degree, the opening of the first electronic expansion valve 30 is increased by 20 pls every cycle until the actual supercooling degree is within the target supercooling degree range value.

[0120] The adjustment range of the second electronic expansion valve 40 is 0-200 pls, and the initial opening of the second electronic expansion valve 40 is 0 pls. When the first actual supercooling degree is within the target supercooling degree range, the second electronic expansion valve 40 does not act. At this time, the opening of the first electronic expansion valve 30 can meet the system supercooling degree. When the first actual supercooling degree is less than the minimum value of the target supercooling degree, and the opening of the first electronic expansion valve 30 is 480 pls, the opening of the first electronic expansion valve 30 has reached the maximum, but the actual supercooling degree cannot meet the target supercooling degree. At this time, the opening of the second electronic expansion valve 40 is increased by 20 pls every cycle until the actual supercooling degree is within the target supercooling degree range value. If the first actual supercooling degree is greater than the maximum value of the target supercooling degree, and the opening of the second electronic expansion valve 40 is not 0, the opening of the second electronic expansion valve 40 is reduced by 20 pls every cycle until the actual supercooling degree is within the target supercooling degree range value.

[0121] Specifically, the target supercooling degree range value can also be understood as the target supercooling degree range.

[0122] As Figure 4 and Figure 5As shown, the specific working process description: the air conditioning system of the present application in the working process, according to different operation mode (constant temperature dehumidification mode, refrigeration mode, heating mode), through the control of the opening of the first electronic expansion valve 30 and the second electronic expansion valve 40, and the state of the switch valve 80, realize the intelligent adjustment of the connection mode and the running state of the second heat exchanger 20. In the constant temperature dehumidification mode, the first heat exchanger 10 as the evaporator, the second heat exchanger 20 as the condenser, through the accurate control of the first electronic expansion valve 30 and the second electronic expansion valve 40, ensure the dehumidification while the indoor temperature is constant. In the refrigeration mode, when the outdoor environment temperature is low, the second heat exchanger 20 is disconnected to stop running, only by the first heat exchanger 10 to carry out refrigeration; when the outdoor environment temperature is high, the second heat exchanger 20 and the first heat exchanger 10 are parallelly connected to run, jointly carry out refrigeration, improve the refrigeration efficiency. In the heating mode, when the outdoor environment temperature is high, the second heat exchanger 20 is disconnected to stop running; when the outdoor environment temperature is low, the second heat exchanger 20 and the first heat exchanger 10 are parallelly connected to run, jointly carry out heating, improve the heating efficiency. In the whole working process, the system will automatically adjust the connection relationship of the second heat exchanger 20 according to the temperature difference value of the indoor environment temperature and the user set temperature, ensure that the system in different modes, according to the actual load demand, reasonable use of heat exchanger, improve the operation efficiency and user comfort.

[0123] As shown in Figure 4 and Figure 5 To reasonably use the main heat exchanger and the auxiliary heat exchanger heat exchange area, the main heat exchanger and the auxiliary heat exchanger can be switched. Specifically, the main heat exchanger is the second heat exchanger 20, and the auxiliary heat exchanger is the first heat exchanger 10. When the load demand is large, the two heat exchangers exchange heat at the same time; when the load demand is small, the auxiliary heat exchanger is closed, and the main heat exchanger exchanges heat alone, which can meet the user comfort while saving energy and electricity. The control method is as follows:

[0124] T 外环 is the outdoor detection temperature, T 内环 is the indoor detection temperature, T 设 is the user set temperature.

[0125] When the refrigeration mode starts, the three-way valve is in the state of connecting the first heat exchanger into the refrigeration heat exchange circuit and disconnecting the second heat exchanger from the refrigeration heat exchange circuit:

[0126] When T 外环 ≤ 28℃, the second electronic expansion valve 40 is closed, at this time the system load demand is small, the main heat exchanger exchanges heat alone, and the auxiliary heat exchanger does not exchange heat.

[0127] When 28℃ < T 内环 ≤ 40℃:

[0128] When T 设≥δT (δT takes 4-6℃), at this time, the user load demand is large, the second electronic expansion valve 40 is opened, and the main and auxiliary heat exchangers simultaneously exchange heat;

[0129] When T 内环 -T 设 <δT (δT takes 4-6℃), at this time, the user load demand is small, the second electronic expansion valve 40 is closed, and the auxiliary heat exchanger does not exchange heat.

[0130] When T 外环 >40℃, at this time, the system load demand is large, the second electronic expansion valve 40 is opened, and the main and auxiliary heat exchangers simultaneously exchange heat.

[0131] When the heating mode starts, the three-way valve is in a state of making the first heat exchanger join the heating heat exchange circuit and making the second heat exchanger disconnect the heating heat exchange circuit:

[0132] When T 外环 ≥3℃, the second electronic expansion valve 40 is closed, at this time, the system load demand is small, the main heat exchanger exchanges heat alone, and the auxiliary heat exchanger does not exchange heat.

[0133] When -5℃≤T 外环 <3℃:

[0134] When T 内环 >T 设 , at this time, the user load demand is small, the second electronic expansion valve 40 is closed, the main heat exchanger exchanges heat alone, and the auxiliary heat exchanger does not exchange heat;

[0135] When T 内环 ≤T 设 , at this time, the user load demand is large, the second electronic expansion valve 40 is opened, and the main and auxiliary heat exchangers simultaneously exchange heat.

[0136] When T 外环 <-5℃, at this time, the system load demand is large, the second electronic expansion valve 40 is opened, and the main and auxiliary heat exchangers simultaneously exchange heat.

[0137] The refrigerant flow direction of the refrigeration heat exchange circuit is opposite to the refrigerant flow direction of the heating heat exchange circuit.

[0138] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: in the refrigeration mode, the constant temperature dehumidification indoor unit auxiliary heat exchanger is fully utilized, the indoor unit evaporation area is increased, and the refrigeration effect is better. In the refrigeration mode, the high-pressure gas pipe high-temperature refrigerant is prevented from entering the auxiliary heat exchanger, so that the outflow temperature is heated, and the outflow temperature is high. When the load demand is large, the main heat exchanger and the auxiliary heat exchanger always act as a condenser / evaporator to realize the heating / cooling function; when the load demand is small, the auxiliary heat exchanger is closed, and the main heat exchanger realizes the heating / cooling function alone, which meets the user comfort while reducing energy consumption.

[0139] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0140] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale of the actual proportions used in the fabrication, assembly, and operation of the example embodiments. Techniques, methods, and apparatus known to those of ordinary skill can not be discussed in detail herein, but should be considered as part of the description unless otherwise stated. In all examples shown and discussed herein, any specific values are to be interpreted as merely exemplary and not limiting. Thus, other examples of example embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and, as such, no further discussion with regard thereto is deemed necessary.

[0141] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application. The orientation words "inner, outer" refer to the inner and outer relative to the contour of the components themselves.

[0142] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device described herein relative to the other device or structure is inverted, then a spatially relative term such as "above" can be interpreted as meaning "below" or "below" can be interpreted as meaning "above". The device can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0143] In addition, it should be pointed out that the use of "first", "second" and the like words to define parts, only for the convenience of the corresponding parts to be distinguished, as no further declaration, the above words have no special meaning, therefore can not be understood as limiting the scope of the present application.

[0144] The above only the preferred embodiments of the present application, and is not intended to limit the present application, for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. An air conditioning system, characterized in that: include: A first heat exchanger (10) and a second heat exchanger (20), wherein the first heat exchanger (10) has an air inlet side (11) and an air outlet side (12) arranged opposite to each other, and the second heat exchanger (20) is arranged on the air outlet side (12) of the first heat exchanger (10), and the air conditioning system has a constant temperature dehumidification mode, a cooling mode, and a heating mode; When the air conditioning system is in the constant temperature dehumidification mode, the first heat exchanger (10) is in an evaporation heat absorption state, and the second heat exchanger (20) is in a condensation heat release state; When the air-conditioning system is in the cooling mode or the heating mode, the second heat exchanger (20) can be selectively arranged in parallel with the first heat exchanger (10), the first heat exchanger (10) is in an evaporation heat absorption state or a condensation heat release state, and the second heat exchanger (20) can be selectively in an evaporation heat absorption state or a condensation heat release state.

2. The air conditioning system according to claim 1, characterized in that The air conditioning system further comprises: a first electronic expansion valve (30) arranged in series with the first heat exchanger (10), wherein the flow rate of the first electronic expansion valve (30) is adjustable; a second electronic expansion valve (40) arranged in series with the second heat exchanger (20); When the air conditioning system is in the constant temperature dehumidification mode, the second electronic expansion valve (40) is closed; when the air conditioning system is in the cooling mode and the heating mode, the flow of the second electronic expansion valve (40) is adjustable.

3. The air conditioning system according to claim 1, characterized in that The air conditioning system further comprises: a first heat exchange pipeline (50), the first heat exchange pipeline (50) having a first communication port (51) and a second communication port (52), and the first heat exchanger (10) being arranged on the first heat exchange pipeline (50); a second heat exchange pipeline (60), wherein the second heat exchange pipeline (60) has a third communication port (61) and a fourth communication port (62), and the second heat exchanger (20) is disposed on the second heat exchange pipeline (60); A main heat exchange path, a compressor and an outdoor heat exchanger, wherein the compressor and the outdoor heat exchanger are arranged on the main heat exchange path, the main heat exchange path has a first heat exchange port and a second heat exchange port, the first connecting port (51) and the third connecting port (61) are both connected to the first heat exchange port, the second connecting port (52) is connected to the second heat exchange port, and the fourth connecting port (62) can be selectively connected to one of the second heat exchange port and the second connecting port (52).

4. The air conditioning system according to claim 3, characterized in that The air conditioning system further comprises: A communication pipeline (70), the communication pipeline (70) having a first connection port and a second connection port, the first connection port being in communication with the second communication port (52), and the second connection port being in communication with the fourth communication port (62); a switch valve (80) connected to at least a portion of the communication pipeline (70), the switch valve (80) having a first switching state and a second switching state; When the switch valve (80) is in the first switching state, the fourth communication port (62) is connected to the second heat exchange port and disconnected from the second communication port (52); When the on-off valve (80) is in the second switching state, the fourth communication port (62) is disconnected from the second heat exchange port and communicates with the second communication port (52).

5. The air conditioning system according to claim 4, characterized in that The switch valve (80) is a three-way valve having a first switching port, a second switching port, and a third switching port, wherein the first switching port is connected to the second heat exchange port, the second switching port is connected to the fourth communication port (62), and the third switching port is connected to the third communication port (61); or, The switch valve (80) includes a first valve and a second valve, wherein the first valve is provided on the communication pipeline (70), and the second valve is provided on the second heat exchange pipeline (60).

6. The air conditioning system according to claim 1, characterized in that The air conditioning system further comprises: a first temperature detecting member (91) and a second temperature detecting member (92), wherein the first temperature detecting member (91) and the second temperature detecting member (92) are respectively arranged at two connection ends of the first heat exchanger (10); and / or, a third temperature detecting member (93) and a fourth temperature detecting member (94), wherein the third temperature detecting member (93) and the fourth temperature detecting member (94) are respectively arranged at two connection ends of the second heat exchanger (20); and / or, A fifth temperature detection component is arranged on the air outlet side of the first heat exchanger (10).

7. A control method, characterized in that: Applicable to the air conditioning system according to any one of claims 1 to 6, the control method comprising: Obtaining an operating mode of the air conditioning system; adjusting the communication mode and operating state of the second heat exchanger of the air-conditioning system according to the operating mode of the air-conditioning system; The operating state includes an evaporation heat absorption state and a condensation heat release state, and the connection mode of the second heat exchanger includes the second heat exchanger being connected in parallel with the first heat exchanger of the air-conditioning system or the second heat exchanger being disconnected to stop operation.

8. The control method according to claim 7, characterized in that: The adjusting the communication mode and the operating state of the second heat exchanger according to the operating mode of the air-conditioning system includes: Get outdoor ambient temperature, indoor ambient temperature and user-set temperature; The connection mode and operation state of the second heat exchanger are adjusted according to the operation mode of the air-conditioning system, the outdoor ambient temperature, the indoor ambient temperature and the user-set temperature.

9. The control method according to claim 8, characterized in that: The adjusting the connection mode and the operating state of the second heat exchanger according to the operating mode of the air-conditioning system, the outdoor ambient temperature, the indoor ambient temperature, and the user-set temperature includes: When the air conditioning system is in cooling mode; When the outdoor ambient temperature is less than or equal to a first preset temperature value, controlling the second heat exchanger to be disconnected to stop operation; When the outdoor ambient temperature is greater than a second preset temperature value, controlling the second heat exchanger to be connected in parallel with the first heat exchanger; When the outdoor ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the connectivity of the second heat exchanger is adjusted according to the temperature difference between the indoor ambient temperature and the user-set temperature.

10. The control method according to claim 9, characterized in that: The adjusting the connectivity of the second heat exchanger according to the temperature difference between the indoor ambient temperature and the user-set temperature includes: When the temperature difference between the indoor ambient temperature and the user-set temperature is greater than or equal to a preset temperature difference, controlling the first heat exchanger and the second heat exchanger to be connected in parallel; When the temperature difference between the indoor ambient temperature and the user-set temperature is less than a preset temperature difference, the second heat exchanger is controlled to be disconnected to stop operation.

11. The control method according to claim 8, characterized in that: The adjusting the connection mode and the operating state of the second heat exchanger according to the operating mode of the air-conditioning system, the outdoor ambient temperature, the indoor ambient temperature, and the user-set temperature includes: When the air conditioning system is in heating mode; When the outdoor ambient temperature is greater than or equal to a third preset temperature value, controlling the second heat exchanger to be disconnected to stop operation; When the outdoor ambient temperature is lower than a fourth preset temperature value, controlling the second heat exchanger to be connected in parallel with the first heat exchanger; When the outdoor ambient temperature is greater than or equal to the fourth preset temperature and less than or equal to the third preset temperature, the connectivity of the second heat exchanger is adjusted according to the temperature difference between the indoor ambient temperature and the user-set temperature.

12. The control method according to claim 11, characterized in that: The adjusting the connectivity of the second heat exchanger according to the temperature difference between the indoor ambient temperature and the user-set temperature includes: When the indoor ambient temperature is greater than or equal to the user-set temperature, controlling the second heat exchanger to disconnect and stop operation; When the indoor ambient temperature is lower than the user-set temperature, the second heat exchanger is controlled to be connected in parallel with the first heat exchanger.

13. The control method according to claim 7, characterized in that: When the air-conditioning system is in cooling mode or heating mode, the control method further includes: Controlling a first electronic expansion valve connected in series with the first heat exchanger to be at its maximum opening and a second electronic expansion valve connected in series with the second heat exchanger to be closed; obtaining a first actual subcooling degree of the first heat exchanger; The opening degree of the first electronic expansion valve and / or the opening degree of the second electronic expansion valve is adjusted according to the first actual subcooling degree of the first heat exchanger.

14. The control method according to claim 13, characterized in that: The adjusting the opening of the first electronic expansion valve and / or the opening of the second electronic expansion valve according to the first actual subcooling degree of the first heat exchanger includes: determining whether a first actual subcooling degree of the first heat exchanger is within a target subcooling degree range; When the first actual subcooling degree of the first heat exchanger is greater than the maximum value of the target subcooling degree range, controlling the opening degree of the first electronic expansion valve to gradually decrease so that the first actual subcooling degree of the first heat exchanger gradually decreases to within the target subcooling degree range; When the first actual subcooling degree of the first heat exchanger is less than the minimum value of the target subcooling degree range, the opening degree of the second electronic expansion valve is controlled to gradually increase so that the first actual subcooling degree of the first heat exchanger gradually increases to within the target subcooling degree range.

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