Air conditioner system and air conditioner control method

Abstract

The invention provides an air conditioner system and an air conditioner control method, and the air conditioner system comprises an outdoor unit which comprises an outdoor heat exchange flow path, and a compressor and an outer heat exchanger which are arranged on the outdoor heat exchange flow path; the indoor unit comprises an inner heat exchanger and a fresh air heat exchanger, and an outlet of the outdoor heat exchange flow path communicates with an inlet of the inner heat exchanger; when an outlet of the inner heat exchanger communicates with an inlet of the fresh air heat exchanger, and an outlet of the fresh air heat exchanger communicates with an inlet of the outdoor heat exchange flow path, the air conditioning system starts a fresh air pre-cooling / preheating function; and when the outlet of the inner heat exchanger communicates with the inlet of the outdoor heat exchange flow path and the fresh air heat exchanger stops running, the air conditioning system closes the fresh air pre-cooling / pre-heating function, so that the problem that in the prior art, the energy consumption of an air conditioner is increased in the process of refrigerating or heating fresh air entering an indoor unit through an air conditioning system is solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioning system and an air conditioning control method. Background Technology

[0002] As people pay more attention to indoor air quality, more and more household split-type room air conditioning systems are beginning to be equipped with fresh air functions.

[0003] However, to prevent hot outdoor air from being directly introduced into the room during summer cooling operation and cold outdoor air from being blown in during winter heating operation, fresh air needs to be cooled / heated before being introduced into the room. This is typically achieved by introducing fresh air into the air conditioning duct or air inlet to mix and heat it with the air conditioning's cool / hot air, or by introducing fresh air into the air conditioning inlet, cooling / heating it through the indoor heat exchanger, and then introducing it into the room. While this method achieves a comfortable supply of cool or hot fresh air, it increases the air conditioning load, raises energy consumption, and is not energy-efficient or environmentally friendly. Summary of the Invention

[0004] The main objective of this invention is to provide an air conditioning system and an air conditioning control method to solve the problem that the process of cooling or heating the fresh air entering the indoor unit in the existing air conditioning system leads to an increase in the energy consumption of the air conditioner.

[0005] To achieve the above objectives, according to one aspect of the present invention, an air conditioning system is provided, comprising: an outdoor unit including an outdoor heat exchange path and a compressor and an outdoor heat exchanger disposed on the outdoor heat exchange path; an indoor unit including an indoor heat exchanger and a fresh air heat exchanger, wherein the outlet of the outdoor heat exchange path is connected to the inlet of the indoor heat exchanger; wherein, when the outlet of the indoor heat exchanger is connected to the inlet of the fresh air heat exchanger, and the outlet of the fresh air heat exchanger is connected to the inlet of the outdoor heat exchange path, the air conditioning system activates the fresh air pre-cooling / preheating function; when the outlet of the indoor heat exchanger is connected to the inlet of the outdoor heat exchange path and the fresh air heat exchanger stops operating, the air conditioning system deactivates the fresh air pre-cooling / preheating function.

[0006] Furthermore, when the air conditioning system is in cooling mode, the compressor's exhaust port is connected to the first connection port of the external heat exchanger, and the compressor's suction port is the inlet of the outdoor heat exchange path; the second connection port of the external heat exchanger is the outlet of the outdoor heat exchange path. When the air conditioning system is in heating mode, the compressor's suction port is connected to the first connection port of the external heat exchanger, and the compressor's exhaust port is the outlet of the outdoor heat exchange path; the second connection port of the external heat exchanger is the inlet of the outdoor heat exchange path.

[0007] Furthermore, the outdoor unit also includes an external multi-way valve installed on the outdoor heat exchange flow path; the first connection port of the external multi-way valve is connected to the first connection port of the external heat exchanger, and the second and third connection ports of the external multi-way valve are connected to the compressor suction port and exhaust port, respectively; wherein, the conduction state of the external multi-way valve can be switched to allow the air conditioning system to switch between cooling mode and heating mode.

[0008] Furthermore, the indoor unit also includes a fresh air multi-way valve and an internal multi-way valve. The first connection port of the fresh air multi-way valve is connected to the inlet of the internal heat exchanger, the second connection port of the fresh air multi-way valve is connected to the outlet of the fresh air heat exchanger, the first connection port of the internal multi-way valve is connected to the inlet of the fresh air heat exchanger, the outlet of the internal heat exchanger is connected to the second connection port of the internal multi-way valve, and the third connection port of the internal multi-way valve is connected to the outlet of the fresh air heat exchanger. The third connection port of the fresh air multi-way valve is connected to the fourth connection port of the external multi-way valve, and the fourth connection port of the fresh air multi-way valve is connected to the second connection port of the external heat exchanger. The conduction states of the fresh air multi-way valve and the internal multi-way valve can be switched to allow the air conditioning system to switch between cooling mode and heating mode, and to enable or disable the fresh air pre-cooling / preheating function of the air conditioning system.

[0009] Furthermore, the fresh air pre-cooling / preheating function includes both fresh air pre-cooling and fresh air preheating functions; when the first and third connecting ports of the external multi-way valve are open and the second and fourth connecting ports are open, the first and fourth connecting ports of the fresh air multi-way valve are open and the second and third connecting ports are open, and the first and second connecting ports of the internal multi-way valve are open, the air conditioning system is in cooling mode and the fresh air pre-cooling function of the air conditioning system is activated; and / or, when the first and third connecting ports of the external multi-way valve are open and the second and fourth connecting ports are open, the first and fourth connecting ports of the fresh air multi-way valve are open and the second and third connecting ports are open, and the second and third connecting ports of the internal multi-way valve are open, the air conditioning system is in cooling mode and the fresh air pre-cooling function of the air conditioning system is activated; and / or, when the first and third connecting ports of the external multi-way valve are open and the second and fourth connecting ports are open, the first and fourth connecting ports of the fresh air multi-way valve are open and the second and third connecting ports are open, and the second and third connecting ports of the internal multi-way valve are open, the air conditioning system is in cooling mode and the fresh air pre-cooling function of the air conditioning system is activated. The air conditioning system's fresh air pre-cooling function is turned off; and / or, when the first and second ports of the external multi-way valve are open and the third and fourth ports are open, the first and third ports of the fresh air multi-way valve are open and the second and fourth ports are open, and the first and second ports of the internal multi-way valve are open, the air conditioning system is in heating mode and the air conditioning system's fresh air preheating function is turned on; and / or, when the first and second ports of the external multi-way valve are open and the third and fourth ports are open, the first and third ports of the fresh air multi-way valve are open and the second and fourth ports are open, and the second and third ports of the internal multi-way valve are open, the air conditioning system is in heating mode and the air conditioning system's fresh air preheating function is turned off.

[0010] According to another aspect of the present invention, an air conditioning control method is provided, applicable to the aforementioned air conditioning system. The air conditioning control method includes: when the air conditioning system is operating in refrigerant mode and the fresh air function is activated, acquiring a first temperature T of the fresh air at the fresh air inlet of the indoor unit. 新风进 And obtain the second temperature T of the refrigerant at the outlet of the internal heat exchanger. 余进 According to the first temperature T 新风进 Second temperature T 余进 Controls whether the air conditioning system activates the fresh air pre-cooling / preheating function; wherein, the refrigerant operation mode includes cooling mode and heating mode, and the fresh air pre-cooling / preheating function includes fresh air pre-cooling function and fresh air preheating function corresponding to cooling mode and heating mode respectively.

[0011] Furthermore, based on the first temperature T 新风进 Second temperature T 余进 Controlling whether the air conditioning system activates the fresh air pre-cooling / preheating function includes: calculating the first temperature T. 新风进 Second temperature T 余进 The absolute value of the first temperature difference between them; based on the first temperature T 新风进 With the first preset temperature T 新风预设 The size between the two, and the size between the absolute value of the first temperature difference and the first preset temperature difference, control whether the air conditioning system activates the fresh air pre-cooling / preheating function.

[0012] Furthermore, based on the first temperature T 新风进 With the first preset temperature T 新风预设 The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference relative to the first preset temperature difference control whether the air conditioning system activates the fresh air pre-cooling / preheating function, including: when the air conditioning system is operating in cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 The first preset temperature difference is ΔT 制冷1 If T 新风进 ≥T 新风预设 And ΔT 制冷01 ≥ΔT 制冷1 If the system is in heating mode, the air conditioning system will activate the fresh air pre-cooling function; and / or, if the air conditioning system is in heating mode, the absolute value of the first temperature difference is ΔT. 制热01 The first preset temperature difference is ΔT 制热1 If T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 Then, the air conditioning system will be controlled to activate the fresh air preheating function.

[0013] Furthermore, after the fresh air pre-cooling / pre-heating function is activated, the air conditioning control method also includes: obtaining the third temperature T of the fresh air at the fresh air outlet in the indoor unit.新风出 The fourth temperature T of the refrigerant at the outlet of the fresh air heat exchanger 余出 According to the third temperature T 新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan in the air conditioning system.

[0014] Furthermore, according to the third temperature T 新风出 and the fourth temperature T 余出 Adjusting the speed of the fresh air fan in the air conditioning system includes: calculating the third temperature T. 新风出 and the fourth temperature T 余出 The absolute value of the second temperature difference; adjust the speed of the fresh air fan according to the magnitude between the absolute value of the second temperature difference and the second preset temperature difference and the third preset temperature difference.

[0015] Furthermore, when the air conditioning system activates the fresh air pre-cooling or fresh air pre-heating function, the fresh air fan is controlled to rotate at an initial speed f; the speed of the fresh air fan is adjusted according to the magnitude between the absolute value of the second temperature difference and the second and third preset temperature differences, including: when the air conditioning system is operating in cooling mode, the absolute value of the second temperature difference is ΔT. 制冷02 The second preset temperature difference is ΔT 制冷2 The third preset temperature difference is ΔT 制冷3 ; where, if ΔT 制冷02 ≥ΔT 制冷2 Then, the fresh air fan is controlled to increase a first speed Δα based on the initial speed f; if ΔT 制冷2 >ΔT 制冷02 >ΔT 制冷3 Then control the fresh air fan to maintain its initial speed f; if ΔT 制冷02 ≤ΔT 制冷3 Then, the fresh air fan is controlled to decrease its second speed Δβ from its initial speed f; and / or, when the air conditioning system is operating in heating mode, the absolute value of the second temperature difference is ΔT. 制热02 The second preset temperature difference is ΔT 制热2 The third preset temperature difference is ΔT 制热3 ; where, if ΔT 制热02 ≥ΔT 制热2 Then, the fresh air fan is controlled to increase a first speed Δα based on the initial speed f; if ΔT 制热2 >ΔT 制热02 >ΔT 制热3 Then control the fresh air fan to maintain its initial speed f; if ΔT 制热02 ≤ΔT 制热3 Then, the fresh air fan is controlled to reduce the second speed Δβ based on the initial speed f.

[0016] Furthermore, based on the third temperature T新风出 and the fourth temperature T 余出 After adjusting the speed of the fresh air fan, when the fresh air fan continues to run for a first preset time t1, the air conditioning control method further includes: acquiring the first temperature T again. 新风进 Second temperature T 余进 According to the first temperature T 新风进 Second temperature T 余进 Control whether the air conditioning system continues to maintain the fresh air pre-cooling / preheating function.

[0017] Furthermore, based on the first temperature T 新风进 Second temperature T 余进 Controlling whether the air conditioning system continues to maintain the fresh air pre-cooling / pre-heating function includes: calculating the first temperature T. 新风进 Second temperature T 余进 The absolute value of the first temperature difference between them; based on the first temperature T 新风进 With the first preset temperature T 新风预设 The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference versus the first preset temperature difference control whether the air conditioning system continues to maintain the fresh air pre-cooling / preheating function.

[0018] Furthermore, based on the first temperature T 新风进 With the first preset temperature T 新风预设 The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference relative to the first preset temperature difference control whether the air conditioning system continues to maintain the fresh air pre-cooling / preheating function, including: when the air conditioning system is operating in cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 The first preset temperature difference is ΔT 制冷1 If T 新风进 ≥T 新风预设 And ΔT 制冷01 ≥ΔT 制冷1 Then, the air conditioning system will continue to operate the fresh air pre-cooling function, and will continue to operate according to the third temperature T. 新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan in the air conditioning system; if T 新风进 <T 新风预设 or ΔT 制冷01 <ΔT 制冷1 If the system is in heating mode, the air conditioning system will shut down its fresh air pre-cooling function; and / or, if the air conditioning system is operating in heating mode, the absolute value of the first temperature difference is ΔT. 制热01 The first preset temperature difference is ΔT 制热1 If T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 If so, the air conditioning system will continue to operate the fresh air preheating function and will continue to operate according to the third temperature T.新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan in the air conditioning system; if T 新风进 >T 新风预设 or ΔT 制热01 <ΔT 制热1 Then, the air conditioning system will be controlled to shut down the fresh air preheating function.

[0019] Furthermore, when the air conditioning system is operating in cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 While activating the fresh air pre-cooling function, the speed of the fresh air fan in the air conditioning system is switched back to the initial speed f; when ΔT 制冷01 At ≥25℃, f=1200rpm; when 20℃≤ΔT 制冷01 When <25℃, f=1000rpm; when 16℃≤ΔT 制冷01 At <20℃, f=900rpm; when ΔT 制冷01 At <16℃, f=800rpm; and / or, when the air conditioning system is operating in heating mode, the absolute value of the first temperature difference is ΔT. 制热01 While activating the fresh air preheating function, the speed of the fresh air fan in the air conditioning system is switched back to the initial speed f; when ΔT 制热01 When the temperature is ≥30℃, f=1200rpm; when the temperature is 25℃≤ΔT 制热01 When <30℃, f=1000rpm; when 21℃≤ΔT 制热01 At <25℃, f=900rpm; when ΔT 制热01 At <21℃, f=800rpm.

[0020] Applying the technical solution of this invention, the air conditioning system of this invention includes: an outdoor unit, comprising an outdoor heat exchange path and a compressor and an outdoor heat exchanger disposed on the outdoor heat exchange path; and an indoor unit, comprising an indoor heat exchanger and a fresh air heat exchanger, wherein the outlet of the outdoor heat exchange path is connected to the inlet of the indoor heat exchanger; wherein, when the outlet of the indoor heat exchanger is connected to the inlet of the fresh air heat exchanger, and the outlet of the fresh air heat exchanger is connected to the inlet of the outdoor heat exchange path, the air conditioning system activates the fresh air pre-cooling / preheating function; when the outlet of the indoor heat exchanger is connected to the inlet of the outdoor heat exchange path and the fresh air heat exchanger stops operating, the air conditioning system deactivates the fresh air pre-cooling / preheating function. Thus, by setting a switchable connection method between the outlet of the indoor heat exchanger and the inlet of the fresh air heat exchanger and the inlet of the outdoor heat exchange path, the air conditioning system can activate or deactivate the fresh air pre-cooling / preheating function, achieving effective pre-cooling / preheating of fresh air and solving the problem of increased energy consumption when introducing fresh air. Specifically, in cooling mode, the air conditioning system can pre-cool the fresh air using a fresh air heat exchanger, reducing the additional cooling burden on the fresh air. In heating mode, it can preheat the fresh air using a fresh air heat exchanger to utilize the waste heat of the indoor heat exchanger. This solves the problem in existing technologies where the cooling or heating process of the fresh air entering the indoor unit leads to increased energy consumption. It reduces the additional heating requirement of the air conditioning system for the fresh air. The air conditioning system can effectively utilize waste heat resources to treat the fresh air while maintaining the efficiency of the main heat exchange process, thereby reducing the overall energy consumption of the air conditioning system, improving the fresh air pretreatment efficiency, and optimizing the operating performance of the air conditioning system. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 A schematic diagram of refrigerant flow in cooling mode is shown in an embodiment of the air conditioning system according to the present invention;

[0023] Figure 2 It shows Figure 1 The diagram shows the refrigerant flow of the air conditioning system in heating mode.

[0024] Figure 3 A control flowchart of an embodiment of the air conditioning control method according to the present invention in cooling mode is shown;

[0025] Figure 4 A control flowchart of an embodiment of the air conditioning control method according to the present invention in heating mode is shown;

[0026] Figure 5A partial control flowchart of an embodiment of the air conditioning control method according to the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 1. Outdoor unit; 11. Compressor; 12. External multi-way valve; 13. External heat exchanger; 14. External fan; 15. Throttling valve;

[0029] 2. Indoor unit; 21. Fresh air multi-way valve; 22. Indoor heat exchanger; 23. Indoor fan; 24. Indoor multi-way valve; 25. Fresh air heat exchanger; 26. Fresh air fan. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 and Figure 2 As shown, the present invention provides an air conditioning system, including: an outdoor unit 1, including an outdoor heat exchange flow path and a compressor 11 and an outdoor heat exchanger 13 disposed on the outdoor heat exchange flow path; an indoor unit 2, including an indoor heat exchanger 22 and a fresh air heat exchanger 25, wherein the outlet of the outdoor heat exchange flow path is connected to the inlet of the indoor heat exchanger 22; wherein, when the outlet of the indoor heat exchanger 22 is connected to the inlet of the fresh air heat exchanger 25, and the outlet of the fresh air heat exchanger 25 is connected to the inlet of the outdoor heat exchange flow path, the air conditioning system activates the fresh air pre-cooling / preheating function; when the outlet of the indoor heat exchanger 22 is connected to the inlet of the outdoor heat exchange flow path and the fresh air heat exchanger 25 stops operating, the air conditioning system deactivates the fresh air pre-cooling / preheating function.

[0032] Thus, the air conditioning system of the present invention, by setting a switchable connection between the outlet of the internal heat exchanger 22 and the inlet of the fresh air heat exchanger 25 and the inlet of the outdoor heat exchange flow path, enables the air conditioning system to turn on or off the fresh air pre-cooling / preheating function, achieving effective pre-cooling / preheating of fresh air and solving the problem of increased energy consumption when introducing fresh air. Specifically, in cooling mode, the air conditioning system can use the fresh air heat exchanger 25 to pre-cool the fresh air, reducing the additional cooling burden on the fresh air; in heating mode, it can use the fresh air heat exchanger 25 to preheat the fresh air, thereby utilizing the waste heat of the internal heat exchanger 22. This solves the problem in the prior art where the process of cooling or heating the fresh air entering the indoor unit leads to increased air conditioning energy consumption, reduces the additional heating requirement of the air conditioning system for fresh air, and allows the air conditioning system to effectively utilize waste heat resources to treat fresh air while maintaining the efficiency of the main heat exchange process, thereby reducing the overall energy consumption of the air conditioning system, improving the fresh air pre-treatment efficiency, and optimizing the operating performance of the air conditioning system.

[0033] The phrase "fresh air heat exchanger 25 stops operating" means that the refrigerant does not flow through the fresh air heat exchanger 25.

[0034] like Figure 1 and Figure 2 As shown, when the air conditioning system is in cooling mode, the exhaust port of the compressor 11 is connected to the first connection port of the external heat exchanger 13, and the suction port of the compressor 11 is the inlet of the outdoor heat exchange path; the second connection port of the external heat exchanger 13 is the outlet of the outdoor heat exchange path. When the air conditioning system is in heating mode, the suction port of the compressor 11 is connected to the first connection port of the external heat exchanger 13, the exhaust port of the compressor 11 is the outlet of the outdoor heat exchange path, and the second connection port of the external heat exchanger 13 is the inlet of the outdoor heat exchange path.

[0035] like Figure 1 and Figure 2 As shown, the outdoor unit 1 also includes an external multi-way valve 12 disposed on the outdoor heat exchange flow path; the first connection port of the external multi-way valve 12 is connected to the first connection port of the external heat exchanger 13, and the second and third connection ports of the external multi-way valve 12 are respectively connected to the suction port and the exhaust port of the compressor 11; wherein, the conduction state of the external multi-way valve 12 can be switched to allow the air conditioning system to switch between cooling mode and heating mode.

[0036] When the first and third ports of the external multi-way valve 12 are open and the second and fourth ports of the external multi-way valve 12 are open, the air conditioning system is in cooling mode, and the fourth port of the external multi-way valve 12 is the inlet of the outdoor heat exchange path; the second port of the external heat exchanger 13 is the outlet of the outdoor heat exchange path. When the first and second ports of the external multi-way valve 12 are open and the third and fourth ports of the external multi-way valve 12 are open, the air conditioning system is in heating mode, and the fourth port of the external multi-way valve 12 is the outlet of the outdoor heat exchange path, and the second port of the external heat exchanger 13 is the inlet of the outdoor heat exchange path.

[0037] like Figure 1 and Figure 2As shown, the indoor unit 2 also includes a fresh air multi-way valve 21 and an internal multi-way valve 24. The first connection port of the fresh air multi-way valve 21 is connected to the inlet of the internal heat exchanger 22, and the second connection port of the fresh air multi-way valve 21 is connected to the outlet of the fresh air heat exchanger 25. The first connection port of the internal multi-way valve 24 is connected to the inlet of the fresh air heat exchanger 25, the outlet of the internal heat exchanger 22 is connected to the second connection port of the internal multi-way valve 24, and the third connection port of the internal multi-way valve 24 is connected to the outlet of the fresh air heat exchanger 25. The third connection port of the fresh air multi-way valve 21 is connected to the fourth connection port of the external multi-way valve 12, and the fourth connection port of the fresh air multi-way valve 21 is connected to the second connection port of the external heat exchanger 13. The conduction states of the fresh air multi-way valve 21 and the internal multi-way valve 24 can be switched to allow the air conditioning system to switch between cooling mode and heating mode, and to enable or disable the fresh air pre-cooling / preheating function of the air conditioning system.

[0038] like Figure 1 and Figure 2 As shown, the fresh air pre-cooling / preheating function includes both fresh air pre-cooling and fresh air preheating functions; when the first and third connecting ports of the external multi-way valve 12 are open and the second and fourth connecting ports are open, the first and fourth connecting ports of the fresh air multi-way valve 21 are open and the second and third connecting ports are open, and the first and second connecting ports of the internal multi-way valve 24 are open, the air conditioning system is in cooling mode and the fresh air pre-cooling function of the air conditioning system is activated; and / or, when the first and third connecting ports of the external multi-way valve 12 are open and the second and fourth connecting ports are open, the first and fourth connecting ports of the fresh air multi-way valve 21 are open and the second and third connecting ports are open, and the second and third connecting ports of the internal multi-way valve 24 are open, the air conditioning system is in cooling mode and the air conditioning system is in pre-cooling mode. The system's fresh air pre-cooling function is off; and / or, when the first and second ports of the external multi-way valve 12 are open and the third and fourth ports are open, the first and third ports of the fresh air multi-way valve 21 are open and the second and fourth ports are open, and the first and second ports of the internal multi-way valve 24 are open, the air conditioning system is in heating mode and the air conditioning system's fresh air preheating function is on; and / or, when the first and second ports of the external multi-way valve 12 are open and the third and fourth ports are open, the first and third ports of the fresh air multi-way valve 21 are open and the second and fourth ports are open, and the second and third ports of the internal multi-way valve 24 are open, the air conditioning system is in heating mode and the air conditioning system's fresh air preheating function is off.

[0039] Specifically, the fresh air fan 26 is located between the fresh air heat exchanger 25 and the fresh air inlet or fresh air outlet of the indoor unit 2.

[0040] In addition, the air conditioning system of the present invention, through the cooperation of the fresh air fan 26 and the fresh air heat exchanger 25, can adjust the fan speed in real time according to the temperature difference between the fresh air and the waste heat of the indoor heat exchanger 22, so as to ensure the stability and energy saving of the pre-cooling or preheating process, avoid the impact of the fresh air being too cold or too hot on the indoor comfort, improve the indoor air quality and enhance the comfort, and also avoid the waste of the waste heat resources of the indoor heat exchanger. It achieves effective control of energy consumption during the pre-cooling / preheating of fresh air and improves the energy efficiency ratio of the air conditioning system.

[0041] Specifically, the external multi-way valve 12 is a four-way valve, with its first connecting port being port a, its second connecting port being port b, its third connecting port being port c, and its fourth connecting port being port d; and / or, the fresh air multi-way valve 21 is a four-way valve, with its first connecting port being port e, its second connecting port being port f, its third connecting port being port g, and its fourth connecting port being port h; and / or, the internal multi-way valve 24 is a three-way valve, with its first connecting port being port j, its second connecting port being port k, and its third connecting port being port m.

[0042] The configuration of the external multi-way valve 12, the fresh air multi-way valve 21, and the internal multi-way valve 24 in the air conditioning system of this invention further refines the management of the refrigerant flow path. The external multi-way valve 12, as a four-way valve, can effectively switch the refrigerant flow direction between cooling and heating modes, ensuring the system's high efficiency and flexibility. Similarly, the fresh air multi-way valve 21 allows fresh air to be pre-cooled or pre-heated before entering the room from the indoor unit 2, depending on the refrigerant operating mode of the air conditioning system, thus reducing the additional energy consumption of the air conditioning system. The internal multi-way valve 24 provides control over whether to pre-treat the fresh air. By switching different flow paths, the functions of fresh air pre-cooling and pre-heating can be activated as needed, which not only optimizes the temperature regulation of the fresh air but also improves the convenience and comfort of the user. Overall, this combination of multi-way valves achieves precise control of the heat exchange process of the air conditioning system, reduces energy consumption, improves the overall energy efficiency ratio of the air conditioning system, and also ensures improved indoor air quality and a comfortable living environment.

[0043] like Figure 1 and Figure 2 As shown, the outdoor unit 1 includes a throttle valve 15, the second connection port of the outdoor heat exchanger 13 is connected to the first connection port of the throttle valve 15, and the second connection port of the throttle valve 15 is connected to the first connection port of the internal multi-way valve 24; and / or, the outdoor unit 1 includes an outdoor fan 14, which is located between the outdoor heat exchanger 13 and the air inlet or outlet of the indoor unit 2; and / or, the indoor unit 2 includes an internal fan 23, which is located between the internal heat exchanger 22 and the return air inlet or outlet of the indoor unit 2.

[0044] The outdoor unit 1 of the air conditioning system of the present invention is equipped with a throttling valve 15 and an outdoor fan 14, and the indoor unit 2 is equipped with an indoor fan 23. This design aims to optimize the refrigerant circulation path and airflow pattern, ensuring that the refrigerant can effectively exchange heat with the indoor heat exchanger 22 through the outdoor heat exchanger 13 during the cooling or heating cycle. The arrangement of the throttling valve 15 helps to precisely control the refrigerant flow rate, thereby optimizing heat exchange efficiency. Especially during the fresh air pre-cooling / preheating process, it ensures that after passing through the indoor heat exchanger 22, the refrigerant can fully utilize the waste heat of the indoor heat exchanger 22 to pre-cool / preheat the fresh air fan 26 through the fresh air heat exchanger 25, reducing energy consumption and improving the overall performance of the air conditioning system. The fresh air fan 26 promotes the effective exchange of outdoor and indoor air, providing users with a more comfortable and energy-efficient air conditioning experience.

[0045] like Figure 1 and Figure 2 As shown, when the air conditioning system is in cooling mode, the second and fourth connecting ports of the external multi-way valve 12 are open, and the first and third connecting ports of the external multi-way valve 12 are also open; the first and fourth connecting ports of the fresh air multi-way valve 21 are open, and the second and third connecting ports of the fresh air multi-way valve 21 are also open; the second and third connecting ports of the internal multi-way valve 24 are open; wherein, when the air conditioning system turns on the fresh air function and needs to pre-cool the fresh air, the first and second connecting ports of the internal multi-way valve 24 are open.

[0046] This multi-way valve configuration allows the air conditioning system to effectively utilize the waste heat from the internal heat exchanger 22 to pre-cool the fresh air in cooling mode. Specifically, in cooling mode, after the refrigerant is discharged from the compressor 11, it passes through the external multi-way valve 12, the external heat exchanger 13, the throttle valve 15, and the fresh air multi-way valve 21, and then enters the internal heat exchanger 22 for the main heat exchange process. The refrigerant then passes through the internal multi-way valve 24 to recover waste heat from the fresh air heat exchanger 25 to pre-cool the fresh air. Finally, it returns to the compressor 11 through the fresh air multi-way valve 21 and the external multi-way valve 12, forming a highly efficient cooling cycle path. This optimizes the management of fresh air, ensuring improved indoor air quality while avoiding increased load on the air conditioning system due to the introduction of overheated fresh air, thereby reducing energy consumption and improving the overall operating efficiency of the air conditioning system.

[0047] like Figure 1 and Figure 2As shown, when the air conditioning system is in heating mode, the third and fourth connecting ports of the external multi-way valve 12 are connected, and the first and second connecting ports of the external multi-way valve 12 are also connected; the first and third connecting ports of the fresh air multi-way valve 21 are connected, and the second and fourth connecting ports of the fresh air multi-way valve 21 are also connected; the second and third connecting ports of the internal multi-way valve 24 are connected; wherein, when the air conditioning system turns on the fresh air function and needs to preheat the fresh air, the first and second connecting ports of the internal multi-way valve 24 are connected.

[0048] This multi-way valve configuration allows the air conditioning system to effectively utilize the waste heat of the internal heat exchanger 22 to preheat the fresh air in heating mode. Specifically, in heating mode, after the refrigerant is discharged from the compressor, it passes through the external multi-way valve 12 and the fresh air multi-way valve 21, and then enters the internal heat exchanger 22 for the main heat exchange process. It then passes through the internal multi-way valve 24 and the fresh air heat exchanger 25 to utilize the waste heat of the internal heat exchanger 22 to preheat the fresh air. Finally, it flows through the fresh air multi-way valve 21 and the throttling valve 15 to the external heat exchanger 13, and then back to the compressor 11 via the external multi-way valve 12. This achieves flexible flow control of the refrigerant in heating mode, utilizing the waste heat of the internal heat exchanger 22, improving energy efficiency, reducing the additional heat load of the air conditioning system, enhancing overall operating efficiency, improving the fresh air preheating efficiency in heating mode, and effectively avoiding the negative impact of excessively cold fresh air on indoor thermal comfort. This achieves rational energy utilization and optimization of the indoor environment.

[0049] like Figure 1 and Figure 2 As shown, a first temperature detection component is installed at the fresh air inlet of the indoor unit 2 to detect the first temperature T of the fresh air at the fresh air inlet of the indoor unit 2. 新风进 The unit is °C; and / or, a second temperature sensing element, disposed at the outlet of the internal heat exchanger 22, for detecting the second temperature T of the refrigerant at the outlet of the internal heat exchanger 22. 余进 The unit is °C; and / or, a third temperature detection component, which is installed at the fresh air outlet in the indoor unit 2, for detecting the third temperature T of the fresh air at the fresh air outlet of the indoor unit 2. 新风出 The unit is °C; and / or, a fourth temperature detection component, which is installed at the outlet of the fresh air heat exchanger 25, for detecting the fourth temperature T of the refrigerant at the outlet of the fresh air heat exchanger 25. 余出 The unit is ℃.

[0050] The temperature detection components in the air conditioning system of this invention provide crucial data support for the air conditioning control method of this invention. In cooling or heating mode, the speed of the fresh air fan 26 is dynamically adjusted based on the temperature difference between the fresh air and the refrigerant to pre-cool or preheat the fresh air, ensuring that the fresh air temperature remains within a comfortable range, avoiding energy waste, and improving the overall energy efficiency of the air conditioning system.

[0051] like Figures 3 to 5 As shown, the present invention provides an air conditioning control method applicable to the aforementioned air conditioning system. The air conditioning control method includes: when the air conditioning system is operating in refrigerant mode and the fresh air function is activated, obtaining the first temperature T of the fresh air at the fresh air inlet of the indoor unit 2. 新风进 And obtain the second temperature T of the refrigerant at the outlet of the internal heat exchanger 22. 余进 According to the first temperature T 新风进 Second temperature T 余进 Controls whether the air conditioning system activates the fresh air pre-cooling / preheating function; wherein, the refrigerant operation mode includes cooling mode and heating mode, and the fresh air pre-cooling / preheating function includes fresh air pre-cooling function and fresh air preheating function corresponding to cooling mode and heating mode respectively.

[0052] The air conditioning control method of this invention ensures the rationality of refrigerant flow and maximizes waste heat utilization by switching various multi-way valves in both cooling and heating modes. The air conditioning system can maintain the high efficiency of the main heat exchange process and effectively pre-treat fresh air, reducing the energy consumption of fresh air treatment, improving the operating performance and energy efficiency ratio of the air conditioning system, providing users with a more comfortable and energy-saving indoor environment, ensuring the stability and energy efficiency of the pre-cooling or pre-heating process, avoiding the impact of excessively cold or hot fresh air on indoor comfort, improving indoor air quality and comfort, effectively avoiding the waste of waste heat in the internal heat exchanger 22, and achieving effective control of energy consumption during fresh air pre-cooling / heat treatment, thus improving the energy efficiency of the air conditioning system.

[0053] like Figure 3 and Figure 4 As shown, based on the first temperature T 新风进 Second temperature T 余进 Controlling whether the air conditioning system activates the fresh air pre-cooling / preheating function includes: calculating the first temperature T. 新风进 Second temperature T 余进 The absolute value of the first temperature difference between them; based on the first temperature T 新风进 With the first preset temperature T 新风预设 The size between the two, and the size between the absolute value of the first temperature difference and the first preset temperature difference, control whether the air conditioning system activates the fresh air pre-cooling / preheating function.

[0054] like Figure 3 and Figure 4 As shown, based on the first temperature T 新风进 With the first preset temperature T 新风预设 The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference relative to the first preset temperature difference control whether the air conditioning system activates the fresh air pre-cooling / preheating function, including: when the air conditioning system is operating in cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 The first preset temperature difference is ΔT 制冷1 If T 新风进 ≥T 新风预设 And ΔT 制冷01 ≥ΔT 制冷1 If the system is in heating mode, the air conditioning system will activate the fresh air pre-cooling function; and / or, if the air conditioning system is in heating mode, the absolute value of the first temperature difference is ΔT. 制热01 The first preset temperature difference is ΔT 制热1 If T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 Then, the air conditioning system will be controlled to activate the fresh air preheating function.

[0055] like Figure 3 and Figure 4 As shown, after the fresh air pre-cooling / pre-heating function is turned on, the air conditioning control method also includes: obtaining the third temperature T of the fresh air at the fresh air outlet of the indoor unit 2. 新风出 The fourth temperature T of the refrigerant at the outlet of the fresh air heat exchanger 25 余出 According to the third temperature T 新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan 26 in the air conditioning system.

[0056] like Figure 3 and Figure 4 As shown, based on the third temperature T 新风出 and the fourth temperature T 余出 Adjusting the speed of the fresh air fan 26 in the air conditioning system includes: calculating the third temperature T. 新风出 and the fourth temperature T 余出 The absolute value of the second temperature difference; the speed of the fresh air fan 26 is adjusted according to the magnitude between the absolute value of the second temperature difference and the second preset temperature difference and the third preset temperature difference.

[0057] like Figure 3 and Figure 4 As shown, when the air conditioning system activates the fresh air pre-cooling or fresh air pre-heating function, the fresh air fan 26 is controlled to rotate at an initial speed f; the speed of the fresh air fan 26 is adjusted according to the magnitude between the absolute value of the second temperature difference and the second preset temperature difference and the third preset temperature difference, including: when the air conditioning system is operating in cooling mode, the absolute value of the second temperature difference is ΔT.制冷02 The second preset temperature difference is ΔT 制冷2 The third preset temperature difference is ΔT 制冷3 ; where, if ΔT 制冷02 ≥ΔT 制冷2 Then, the fresh air fan 26 is controlled to increase the first speed Δα based on the initial speed f; if ΔT 制冷2 >ΔT 制冷02 >ΔT 制冷3 Then control the fresh air fan 26 to maintain its initial speed f; if ΔT 制冷02 ≤ΔT 制冷3 Then, the fresh air fan 26 is controlled to reduce the second speed Δβ based on the initial speed f; and / or, when the air conditioning system is operating in heating mode, the absolute value of the second temperature difference is ΔT. 制热02 The second preset temperature difference is ΔT 制热2 The third preset temperature difference is ΔT 制热3 ; where, if ΔT 制热02 ≥ΔT 制热2 Then, the fresh air fan 26 is controlled to increase the first speed Δα based on the initial speed f; if ΔT 制热2 >ΔT 制热02 >ΔT 制热3 Then control the fresh air fan 26 to maintain its initial speed f; if ΔT 制热02 ≤ΔT 制热3 Then, the fresh air fan 26 is controlled to reduce the second speed Δβ based on the initial speed f.

[0058] like Figure 3 and Figure 4 As shown, based on the third temperature T 新风出 and the fourth temperature T 余出 After adjusting the speed of the fresh air fan 26, when the fresh air fan 26 continues to run for a first preset time t1, the air conditioning control method further includes: acquiring the first temperature T again. 新风进 Second temperature T 余进 According to the first temperature T 新风进 Second temperature T 余进 Control whether the air conditioning system continues to maintain the fresh air pre-cooling / preheating function.

[0059] like Figure 3 and Figure 4 As shown, based on the first temperature T 新风进 Second temperature T 余进 Controlling whether the air conditioning system continues to maintain the fresh air pre-cooling / pre-heating function includes: calculating the first temperature T. 新风进 Second temperature T 余进 The absolute value of the first temperature difference between them; based on the first temperature T 新风进 With the first preset temperature T 新风预设The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference versus the first preset temperature difference control whether the air conditioning system continues to maintain the fresh air pre-cooling / preheating function.

[0060] like Figure 3 and Figure 4 As shown, based on the first temperature T 新风进 With the first preset temperature T 新风预设 The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference relative to the first preset temperature difference control whether the air conditioning system continues to maintain the fresh air pre-cooling / preheating function, including: when the air conditioning system is operating in cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 The first preset temperature difference is ΔT 制冷1 If T 新风进 ≥T 新风预设 And ΔT 制冷01 ≥ΔT 制冷1 Then, the air conditioning system will continue to operate the fresh air pre-cooling function, and will continue to operate according to the third temperature T. 新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan 26 in the air conditioning system; if T 新风进 <T 新风预设 or ΔT 制冷01 <ΔT 制冷1 If the system is in heating mode, the air conditioning system will shut down its fresh air pre-cooling function; and / or, if the air conditioning system is operating in heating mode, the absolute value of the first temperature difference is ΔT. 制热01 The first preset temperature difference is ΔT 制热1 If T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 If so, the air conditioning system will continue to operate the fresh air preheating function and will continue to operate according to the third temperature T. 新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan 26 in the air conditioning system; if T 新风进 >T 新风预设 or ΔT 制热01 <ΔT 制热1 Then, the air conditioning system will be controlled to shut down the fresh air preheating function.

[0061] like Figure 3 and Figure 4 As shown, when the air conditioning system is operating in cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 While activating the fresh air pre-cooling function, the speed of the fresh air fan 26 in the air conditioning system is switched back to the initial speed f; when ΔT 制冷01 At ≥25℃, f=1200rpm; when 20℃≤ΔT 制冷01 When <25℃, f=1000rpm; when 16℃≤ΔT制冷01 At <20℃, f=900rpm; when ΔT 制冷01 At <16℃, f=800rpm; and / or, when the air conditioning system is operating in heating mode, the absolute value of the first temperature difference is ΔT. 制热01 While activating the fresh air preheating function, the speed of the fresh air fan 26 in the air conditioning system is switched back to the initial speed f; when ΔT 制热01 When the temperature is ≥30℃, f=1200rpm; when the temperature is 25℃≤ΔT 制热01 When <30℃, f=1000rpm; when 21℃≤ΔT 制热01 At <25℃, f=900rpm; when ΔT 制热01 At <21℃, f=800rpm.

[0062] like Figure 3 As shown, when the air conditioning system is running in cooling mode, the air conditioning control method further includes: when the air conditioning system activates the fresh air function, obtaining the first temperature T of the fresh air at the fresh air inlet of the indoor unit 2. 新风进 The second temperature T of the refrigerant at the inlet of the fresh air heat exchanger 25 or the outlet of the internal heat exchanger 22 余进 ; Calculate the first temperature T 新风进 Second temperature T 余进 The absolute value of the first temperature difference between them; determine the first temperature T. 新风进 With the first preset temperature T 新风预设 The magnitude between them, and the absolute value of the first temperature difference and the first preset temperature difference; if T 新风进 ≥T 新风预设 And ΔT 制冷01 ≥ΔT 制冷1 This indicates that the fresh air temperature is too high and needs to be pre-cooled. Also, the temperature difference between the fresh air and the residual heat of the internal heat exchanger 22 is large, which can achieve efficient heat exchange. The larger the temperature difference, the higher the heat exchange efficiency. Then, the first and second connecting ports of the internal multi-way valve 24 are opened, and the fresh air fan 26 is controlled to rotate at the initial speed f to pre-cool the fresh air.

[0063] The above settings not only reduce the additional cooling load on the air conditioning system during cooling, but also improve the energy efficiency of the air conditioning system by reusing waste heat, thus reducing energy consumption. In subsequent operation, the initial temperature T of the unpre-cooled / preheated fresh air entering indoor unit 2 from the outdoor side is monitored. 新风进 The second temperature T of the refrigerant at the inlet of the fresh air heat exchanger 25 or the outlet of the internal heat exchanger 22 余进 The speed of the fresh air fan 26 is dynamically adjusted to ensure that the pre-cooling effect of the fresh air achieves the expected comfort standard while avoiding unnecessary energy waste.

[0064] T 新风预设The preset temperature of the fresh air that has not been pre-cooled at the fresh air inlet of the indoor unit 2 from the outdoor side in cooling mode.

[0065] ΔT 制冷1 The first preset temperature difference is the preset temperature difference between the preset temperature of the refrigerant at the outlet of the indoor heat exchanger 22 in cooling mode and the preset temperature of the fresh air at the fresh air inlet of the indoor unit 2.

[0066] like Figure 3 As shown, the air conditioning control method further includes: obtaining the third temperature T of the fresh air at the fresh air outlet of the indoor unit 2. 新风出 The fourth temperature T of the refrigerant at the outlet of the fresh air heat exchanger 25 余出 ; Calculate the third temperature T 新风出 and the fourth temperature T 余出 The absolute value of the second temperature difference; determine the magnitude of the absolute value of the second temperature difference relative to the second preset temperature difference and the third preset temperature difference; if ΔT 制冷02 ≥ΔT 制冷2 This indicates that the pre-cooling effect of the fresh air is insufficient, and the speed of the fresh air fan 26 needs to be increased to ensure more thorough heat exchange between the fresh air and the waste heat of the internal heat exchanger 22. Therefore, the speed of the fresh air fan 26 should be increased by Δα based on the initial speed f; if ΔT 制冷2 >ΔT 制冷02 >ΔT 制冷3 This indicates that the pre-cooling effect of the fresh air is good, so the fresh air fan 26 should be kept at its initial speed f; if ΔT 制冷02 ≤ΔT 制冷3 If excessive pre-cooling of the fresh air indicates that the fresh air temperature may be too low, affecting indoor comfort, then the speed of the fresh air fan 26 is reduced by Δβ from its initial speed f, appropriately weakening the heat exchange between the fresh air and the waste heat of the internal heat exchanger 22. This dynamic adjustment mechanism ensures a balance between the efficiency of fresh air pre-cooling or pre-heating and indoor comfort. By precisely controlling the speed of the fresh air fan 26, the rational utilization of flow energy is achieved, reducing energy consumption during the operation of the air conditioning system.

[0067] ΔT 制冷2 This is the second preset temperature difference between the preset temperature of the refrigerant at the outlet of the fresh air heat exchanger 25 in cooling mode and the preset temperature of the fresh air at the fresh air outlet of the indoor unit 2.

[0068] ΔT 制冷3 This is the third preset temperature difference between the preset temperature of the refrigerant at the outlet of the fresh air heat exchanger 25 in cooling mode and the preset temperature of the fresh air at the fresh air outlet of the indoor unit 2.

[0069] like Figure 3As shown, the air conditioning control method further includes: after the fresh air fan 26 continues to run for a first preset time t1, acquiring the first temperature T of the fresh air at the fresh air inlet of the indoor unit 2 again. 新风进 The second temperature T of the refrigerant at the inlet of the fresh air heat exchanger 25 or the outlet of the internal heat exchanger 22 余进 ; Calculate the first temperature T 新风进 Second temperature T 余进 The absolute value of the first temperature difference between them; determine the first temperature T. 新风进 With the first preset temperature T 新风预设 The magnitude between them, and the absolute value of the first temperature difference and the first preset temperature difference; if T 新风进 ≥T 新风预设 And ΔT 制冷01 ≥ΔT 制冷1 Then return to obtaining the third temperature T of the fresh air at the fresh air outlet in indoor unit 2. 新风出 The fourth temperature T of the refrigerant at the outlet of the fresh air heat exchanger 25 余出 This is the starting step; if T 新风进 <T 新风预设 or ΔT 制冷01 <ΔT 制冷1 Then, the second and third connecting ports of the control multi-way valve 24 are opened. This ensures the timely start and stop of the fresh air pre-cooling function, avoids unnecessary energy consumption, effectively improves the energy efficiency of the air conditioning system, and also ensures the comfort of the indoor environment.

[0070] Specifically, 25℃≤T 新风预设 ≤45℃; and / or, 5℃≤ΔT 制冷1 ≤30℃; and / or, 0≤f≤2000rpm.

[0071] To optimize the operation of the air conditioning system, this invention defines specific value ranges for a series of key parameters to ensure that the waste heat of the internal heat exchanger 22 can be effectively used to pre-cool the fresh air in cooling mode, and the waste heat can be used to pre-heat the fresh air in heating mode, thereby achieving energy saving and emission reduction.

[0072] Furthermore, T 新风预设 =30℃, ΔT 制冷1 =15℃, 500rpm≤f≤1000rpm.

[0073] Initial rotational speed f and ΔT 制冷01 Size-related, ΔT 制冷01 The larger the value of ΔT, the larger the initial rotational speed f; when ΔT 制冷01 At ≥25℃, f=1200rpm; when 20℃≤ΔT 制冷01 When <25℃, f=1000rpm; when 16℃≤ΔT 制冷01At <20℃, f=900rpm; when T 新风进 -T 余进 At temperatures below 16℃, f = 800 rpm. This gradient speed control strategy can automatically adjust the operating speed of the fresh air fan 26 according to the actual temperature difference between the fresh air and the waste heat of the internal heat exchanger 22, ensuring that the fresh air pre-cooling process is both efficient and energy-saving, avoiding unnecessary energy waste, and ensuring that the indoor fresh air temperature after pre-cooling meets the human comfort requirements. This achieves effective pre-cooling of fresh air and optimized energy consumption management of the air conditioning system during cooling operation.

[0074] f—The initial speed of the fresh air fan, in rpm, and its range includes, but is not limited to, 0 to 2000 rpm. The initial speed f is related to the temperature difference between the fresh air and the waste heat of the heat exchanger. The larger the temperature difference, the larger the initial speed f can be, because a large temperature difference means more accumulated heat / cold, and a higher fan speed can be used to utilize this heat to preheat / precool the fresh air.

[0075] In cooling mode, the initial speed f of the fresh air fan is determined based on experimental testing and actual comfort experience. The initial speed f of the fresh air fan under different temperature differences needs to be adjusted by adjusting the T... 余出 The temperature should not rise too high or fall too low, but remain within the reasonable range of the cooling system. Specifically, this means specifying a certain temperature range (T). 余进 Next, by adjusting the speed of the fresh air fan and recording T... 余出 So that T 余出 Within the reasonable range of the refrigeration system, and when the temperature of the fresh air outlet at the fan speed f is neither too cold nor too hot as perceived by humans, the speed of the fresh air fan at this time is the initial speed f under the current conditions.

[0076] For example, in cooling mode, set T 余进 The temperature is 8℃. Fresh air from an outdoor temperature of 30℃ (summer temperature) is introduced, with a temperature difference of 22℃. The fresh air fan speed is set to 1000rpm. At this time, the temperature T is measured. 余出 =13℃, which is within the reasonable range of the refrigeration system; at the same time, the fresh air outlet temperature T was measured. 新风出 =25℃, and the temperature of the fresh air outlet is not too hot according to human experience. Therefore, it is determined that when 20℃≤T 新风进 -T 余进 At <25℃, f=1000rpm.

[0077] Specifically, T in cooling mode 新风预设 The temperature range is between 25℃ and 45℃, which allows the air conditioning system to adjust the degree of fresh air pre-cooling according to actual needs while ensuring indoor comfort, avoiding energy waste caused by excessive pre-cooling. The preset temperature difference ΔT between the waste heat of the internal heat exchanger 22 and the fresh air is... 制冷1Set within the 5℃ to 30℃ range, this setting ensures that the fresh air heat exchanger 25 can efficiently absorb energy from waste heat, while preventing low heat exchange efficiency due to excessively small temperature differences. Furthermore, the speed f of the fresh air fan 26 is controlled within the range of 0rpm to 2000rpm. By dynamically adjusting the speed of the fresh air fan 26, we can precisely control the degree of heat exchange between the fresh air and the waste heat of the internal heat exchanger 22, ensuring that the pre-cooling effect of the fresh air is both as expected and not too drastic, thus providing users with a more stable indoor environment. The reasonable setting and precise control of these parameters together achieve effective pre-cooling of the fresh air by the air conditioning system, significantly reducing the overall energy consumption of the air conditioning system, while also improving the user's indoor comfort experience.

[0078] Specifically, 5℃≤ΔT 制冷2 ≤35℃; and / or, 5℃≤ΔT 制冷3 ≤35℃; and / or, 10℃≤ΔT 制冷2 -ΔT 制冷3 ≤20℃; and / or, 0≤Δα≤200rpm; and / or, 0≤Δβ≤200rpm; and / or, 0≤t1≤10min. The effective configuration and control of these parameters not only improves the efficiency of fresh air pretreatment but also significantly reduces the overall energy consumption of the air conditioning system, demonstrating effective energy management and utilization.

[0079] Furthermore, ΔT 制冷2 =25℃, ΔT 制冷3 =10℃, Δα=50rpm, Δβ=50rpm, t1=3min.

[0080] This invention achieves refined heat management through intelligent control of the fresh air fan's rotation speed. Based on real-time monitoring of the temperature difference between the fresh air intake (Tfresh) and residual air intake (Tresidual) in cooling mode, this technical solution brings significant comprehensive benefits. Firstly, when the temperature difference is large, increasing the fresh air fan's rotation speed enhances heat exchange between the hot and cold media, more effectively utilizing waste heat resources and reducing unnecessary heating or cooling burdens on the air conditioning system, thereby significantly reducing energy consumption and improving overall energy efficiency. Secondly, by rationally adjusting the fresh air fan's rotation speed, the fresh air temperature can be precisely adjusted according to the degree of pre-cooling, preventing excessively cold indoor temperatures and significantly enhancing living comfort. Furthermore, the dynamically adjusted fresh air fan's rotation speed, based on real-time temperature difference feedback, maintains the fresh air temperature within a preset ideal range, ensuring continuous and stable pre-cooling effects, and maintaining constant indoor air quality even with changes in external conditions. In addition, it avoids unnecessary high-speed operation, reducing mechanical stress and wear on the fan and related components, effectively extending equipment lifespan and reducing maintenance costs. The linkage mechanism between temperature difference and fan speed enhances the system's flexibility, enabling it to quickly respond to temperature changes across different seasons and times, adapting to diverse usage scenarios. In summary, this technical solution not only improves the operating efficiency of the air conditioning system and achieves energy conservation and emission reduction, but also extends equipment lifespan and reduces operating costs while ensuring residential comfort, demonstrating its high practical value and powerful functionality in real-world applications.

[0081] like Figure 4 As shown, when the air conditioning system is running in heating mode, the air conditioning control method further includes: determining whether the air conditioning system has activated the fresh air function; when the air conditioning system has activated the fresh air function, obtaining the first temperature T of the fresh air at the fresh air inlet in the indoor unit 2. 新风进 The second temperature T of the refrigerant at the inlet of the fresh air heat exchanger 25 or the outlet of the internal heat exchanger 22 余进 ; Calculate the second temperature T 余进 and the first temperature T 新风进 The absolute value of the first temperature difference between them; determine the first temperature T. 新风进 With the second preset temperature T 新风预设 The magnitude between them, and the absolute value of the first temperature difference and the first preset temperature difference; if T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 This indicates that the fresh air temperature is too low and needs to be preheated. Also, the waste heat of the internal heat exchanger 22 has a large temperature difference with the fresh air, which can achieve efficient heat exchange. Therefore, the first and second connecting ports of the internal multi-way valve 24 are opened, and the fresh air fan 26 is controlled to rotate at the initial speed f to preheat the fresh air.

[0082] In heating mode, a similar principle is applied. By precisely controlling the speed of the fresh air fan 26 and adjusting the refrigerant circulation path in a timely manner, the waste heat of the internal heat exchanger 22 is effectively utilized to preheat the fresh air, thereby reducing the additional heat supply required during air conditioning heating and improving the system's energy efficiency ratio. This waste heat recovery-based design not only solves the energy waste problem caused by the lack of an independent exhaust channel in existing air conditioning fresh air systems, but also optimizes fresh air pretreatment by introducing a flexible multi-way valve switching mechanism and an intelligent fan speed adjustment algorithm. This ensures comfortable indoor air quality while reducing operating costs, demonstrating the dual value of technological innovation in improving user experience and environmental benefits.

[0083] T 新风预设 The preset temperature of the unpreheated fresh air entering the indoor unit 2 from the outdoor side in heating mode.

[0084] ΔT 制热1 The first preset temperature difference is the temperature difference between the preset temperature of the refrigerant at the outlet of the indoor heat exchanger 22 and the preset temperature of the fresh air at the fresh air inlet of the indoor unit 2 in the heating mode.

[0085] like Figure 4 As shown, the air conditioning control method further includes: obtaining the third temperature T of the fresh air at the fresh air outlet of the indoor unit 2. 新风出 The fourth temperature T of the refrigerant at the outlet of the fresh air heat exchanger 25 余出 ; Calculate the fourth temperature T 余出 and the third temperature T 新风出 The absolute value of the second temperature difference; determine the magnitude of the absolute value of the second temperature difference relative to the second preset temperature difference and the third preset temperature difference; if ΔT 制热02 ≥ΔT 制热2 This indicates insufficient preheating of the fresh air, requiring an increase in the speed of the fresh air fan 26 to ensure more thorough heat exchange between the fresh air and the residual heat of the internal heat exchanger 22. Therefore, the speed of the fresh air fan 26 should be increased by Δα based on its initial speed f; if ΔT 制热2 >ΔT 制热02 >ΔT 制热3 This indicates that the preheating effect of the fresh air is good, so the fresh air fan 26 should be kept at its initial speed f; if ΔT 制热02 ≤ΔT 制热3 If the preheating of the fresh air is excessive, it may cause the fresh air temperature to be too high, affecting indoor comfort. Therefore, the speed of the fresh air fan 26 is reduced by Δβ based on the initial speed f, so that the heat exchange between the fresh air and the residual heat of the internal heat exchanger 22 is appropriately reduced.

[0086] The aforementioned control strategy, which adaptively adjusts the speed of the fresh air fan to 26 based on temperature difference, can not only stably control the fresh air preheating effect and avoid excessively high fresh air temperature from affecting indoor comfort, but also effectively reduce energy consumption and improve the operating efficiency of the air conditioning system. The air conditioning system can flexibly cope with various operating conditions and achieve the best fresh air preheating effect and energy utilization efficiency.

[0087] ΔT 制热2 This is the second preset temperature difference between the preset temperature of the refrigerant at the outlet of the fresh air heat exchanger 25 in heating mode and the preset temperature of the fresh air at the fresh air inlet of the indoor unit 2.

[0088] ΔT 制热3 This is the third preset temperature difference between the preset temperature of the refrigerant at the outlet of the fresh air heat exchanger 25 in heating mode and the preset temperature of the fresh air at the fresh air inlet of the indoor unit 2.

[0089] like Figure 4 As shown, the air conditioning control method further includes: after the fresh air fan 26 continues to run for a first preset time t1, acquiring the first temperature T of the fresh air at the fresh air inlet of the indoor unit 2 again. 新风进 The second temperature T of the refrigerant at the inlet of the fresh air heat exchanger 25 or the outlet of the internal heat exchanger 22 余进 ; Calculate the second temperature T 余进 and the first temperature T 新风进 The absolute value of the first temperature difference between them; determine the first temperature T. 新风进 With the second preset temperature T 新风预设 The magnitude between them, and the absolute value of the first temperature difference and the first preset temperature difference; if T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 Then return to obtaining the third temperature T of the fresh air at the fresh air outlet in indoor unit 2. 新风出 The fourth temperature T of the refrigerant at the outlet of the fresh air heat exchanger 25 余出 This is the starting step; if T 新风进 >T 新风预设 or ΔT 制热01 <ΔT 制热1 Then the second and third ports of the control multi-way valve 24 are connected.

[0090] This dynamic adjustment mechanism ensures the efficiency and comfort of the fresh air preheating process, reflects the intelligent management of fresh air preheating by the air conditioning system in heating mode, avoids energy waste, optimizes energy utilization, enhances user comfort experience, and improves the overall energy efficiency of the air conditioning system.

[0091] When the air conditioning system is running in heating mode, 10℃≤T 新风预设≤25℃; and / or, 5℃≤ΔT 制热1 ≤30℃; and / or, 0rpm≤f≤2000rpm.

[0092] Initial rotational speed f and ΔT 制热01 Size-related, ΔT 制热01 The larger the value of ΔT, the larger the initial rotational speed f; when ΔT 制热01 When the temperature is ≥30℃, f=1200rpm; when the temperature is 25℃≤ΔT 制热01 When <30℃, f=1000rpm; when 21℃≤ΔT 制热01 At <25℃, f=900rpm; when ΔT 制热01 At temperatures below 21°C, f = 800 rpm. This speed adjustment mechanism ensures efficient heat exchange between the fresh air and the waste heat of the internal heat exchanger 22 while avoiding excessive energy consumption. By precisely controlling the speed of the fresh air fan 26, the relationship between heat exchange efficiency and energy consumption can be balanced, achieving more economical and effective waste heat recovery, thereby improving the overall energy efficiency of the air conditioning system.

[0093] In heating mode, the initial speed f of the fresh air fan is determined based on experimental testing and actual comfort experience.

[0094] Specifically, T 新风预设 =15℃, ΔT 制热1 =20℃; and / or, 500rpm≤f≤1500rpm. This invention, by precisely controlling the speed of the fresh air fan within the above range, can dynamically adjust the degree of heat exchange between fresh air and waste heat according to real-time temperature difference changes, ensuring stable and energy-saving fresh air preheating effect, thereby improving overall energy efficiency.

[0095] Specifically, T in heating mode 新风预设 The temperature range is between 10℃ and 25℃, which allows the air conditioning system to adjust the degree of fresh air preheating according to actual needs while ensuring indoor comfort, avoiding energy waste caused by excessive preheating. The preset temperature difference ΔT between the waste heat of the internal heat exchanger 22 and the fresh air is... 制热1 Set within the 5℃ to 30℃ range, this setting ensures that the fresh air heat exchanger 25 can efficiently absorb energy from waste heat, while preventing low heat exchange efficiency due to excessively small temperature differences. Furthermore, the speed f of the fresh air fan 26 is controlled within the range of 0 to 2000 rpm. By dynamically adjusting the speed of the fresh air fan 26, we can precisely control the degree of heat exchange between the fresh air and the waste heat of the internal heat exchanger 22, ensuring that the preheating effect of the fresh air is both as expected and not too drastic, thus providing users with a more stable indoor environment. The reasonable setting and precise control of these parameters together achieve effective preheating of the fresh air by the air conditioning system, significantly reducing the overall energy consumption of the air conditioning system, while also improving the user's indoor comfort experience.

[0096] When the air conditioning system is running in heating mode, 5℃≤ΔT 制热2 ≤35℃; and / or, 5℃≤ΔT 制热3 ≤35℃; and / or, 10℃≤ΔT 制热2 -ΔT 制热3 ≤20℃; and / or, 0≤Δα≤200rpm; and / or, 0≤Δβ≤200rpm; and / or, 0≤t1≤10min. By carefully adjusting the above parameters, this embodiment achieves high efficiency and energy saving in fresh air pre-cooling / preheating, effectively improving the overall performance and user experience of the air conditioning system, while reducing operating costs.

[0097] When the air conditioning system is running in heating mode, ΔT 制热2 =30℃、ΔT 制热3 =15℃, Δα=50rpm, Δβ=50rpm, t1=3min.

[0098] This invention achieves intelligent control of the fresh air fan speed based on real-time monitoring of T during heating mode. 新风进 and T 余进 Temperature difference and T 新风进 and T 余进 The temperature difference allows for precise heat management, resulting in significant comprehensive benefits. Firstly, when the temperature difference is large, increasing the fresh air fan speed enhances heat exchange between the hot and cold media, more effectively utilizing waste heat resources and reducing unnecessary heating burden on the air conditioning system, thus significantly reducing energy consumption and improving overall energy efficiency. Secondly, by rationally adjusting the fresh air fan speed, the fresh air temperature can be precisely adjusted according to the degree of preheating, preventing excessive indoor temperature and significantly enhancing living comfort. Thirdly, the dynamically adjusted fresh air fan speed maintains the fresh air temperature within a preset ideal range based on real-time temperature difference feedback, ensuring continuous and stable pre-cooling or preheating effects, and maintaining constant indoor air quality even with changes in external conditions. Furthermore, it avoids unnecessary high-speed operation, reducing mechanical stress and wear on the fan and related components, effectively extending equipment lifespan and reducing maintenance costs. The linkage mechanism between temperature difference and fan speed also enhances system flexibility, enabling rapid response to temperature changes across different seasons and times, adapting to diverse usage scenarios. In summary, this technical solution not only improves the operating efficiency of the air conditioning system and achieves energy conservation and emission reduction, but also extends the equipment life and reduces operating costs while ensuring residential comfort, demonstrating its high practical value and powerful functions in real-world applications.

[0099] An air conditioning system (variable frequency 3P cooling capacity) of the present invention was tested. The air conditioning control method of the present invention was compared with that of the air conditioning control method without the present invention. The verification method and results are as follows:

[0100] Cooling operation: Initial indoor temperature 35℃, outdoor temperature 35℃; after the experiment begins, turn off indoor unit 2 to allow the indoor temperature to cool down freely, set the temperature to 27℃ and turn on the fresh air function, and run continuously for 3 hours.

[0101] Heating operation: Initial indoor temperature 2℃, outdoor temperature -7℃; After the experiment begins, turn off indoor unit 2 to allow the indoor temperature to rise freely, set it to 20℃ and turn on the fresh air function, and run continuously for 3 hours.

[0102] The test results are as follows: when using the air conditioning control method of the present invention, the power consumption for cooling operation is 1.442 kWh and the power consumption for heating operation is 4.941 kWh; when not using the air conditioning control method of the present invention, the power consumption for cooling operation is 1.796 kWh and the power consumption for heating operation is 5.673 kWh.

[0103] Experimental data show that, under the same operating conditions, the air conditioning system and air conditioning control method of the present invention can reduce the overall energy consumption of the air conditioning system by approximately 12.9% to 19.7%.

[0104] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0105] The air conditioning system of the present invention includes: an outdoor unit 1, including an outdoor heat exchange flow path and a compressor 11 and an outdoor heat exchanger 13 disposed on the outdoor heat exchange flow path; an indoor unit 2, including an indoor heat exchanger 22 and a fresh air heat exchanger 25, wherein the outlet of the outdoor heat exchange flow path is connected to the inlet of the indoor heat exchanger 22; wherein, when the outlet of the indoor heat exchanger 22 is connected to the inlet of the fresh air heat exchanger 25, and the outlet of the fresh air heat exchanger 25 is connected to the inlet of the outdoor heat exchange flow path, the air conditioning system activates the fresh air pre-cooling / preheating function; when the outlet of the indoor heat exchanger 22 is connected to the inlet of the outdoor heat exchange flow path and the fresh air heat exchanger stops operating, the air conditioning system deactivates the fresh air pre-cooling / preheating function. Thus, the air conditioning system of the present invention, by setting a switchable connection between the outlet of the internal heat exchanger 22 and the inlet of the fresh air heat exchanger 25 and the inlet of the outdoor heat exchange flow path, enables the air conditioning system to turn on or off the fresh air pre-cooling / preheating function, achieving effective pre-cooling / preheating of fresh air and solving the problem of increased energy consumption when introducing fresh air. Specifically, in cooling mode, the air conditioning system can use the fresh air heat exchanger 25 to pre-cool the fresh air, reducing the additional cooling burden on the fresh air; in heating mode, it can use the fresh air heat exchanger 25 to preheat the fresh air, thereby utilizing the waste heat of the internal heat exchanger 22. This solves the problem in the prior art where the process of cooling or heating the fresh air entering the indoor unit leads to increased air conditioning energy consumption, reduces the additional heating requirement of the air conditioning system for fresh air, and allows the air conditioning system to effectively utilize waste heat resources to treat fresh air while maintaining the efficiency of the main heat exchange process, thereby reducing the overall energy consumption of the air conditioning system, improving the fresh air pre-treatment efficiency, and optimizing the operating performance of the air conditioning system.

[0106] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0107] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0108] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0109] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0110] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air conditioning system, characterized in that, include: The outdoor unit (1) includes an outdoor heat exchange flow path and a compressor (11) and an external heat exchanger (13) disposed on the outdoor heat exchange flow path. The indoor unit (2) includes an internal heat exchanger (22) and a fresh air heat exchanger (25), and the outlet of the outdoor heat exchange flow path is connected to the inlet of the internal heat exchanger (22); When the outlet of the internal heat exchanger (22) is connected to the inlet of the fresh air heat exchanger (25), and the outlet of the fresh air heat exchanger (25) is connected to the inlet of the outdoor heat exchange path, the air conditioning system activates the fresh air pre-cooling / preheating function; when the outlet of the internal heat exchanger (22) is connected to the inlet of the outdoor heat exchange path and the fresh air heat exchanger (25) stops running, the air conditioning system deactivates the fresh air pre-cooling / preheating function.

2. The air conditioning system according to claim 1, characterized in that, When the air conditioning system is in cooling mode, the exhaust port of the compressor (11) is connected to the first connection port of the external heat exchanger (13), the suction port of the compressor (11) is the inlet of the outdoor heat exchange flow path; the second connection port of the external heat exchanger (13) is the outlet of the outdoor heat exchange flow path. When the air conditioning system is in heating mode, the suction port of the compressor (11) is connected to the first connection port of the external heat exchanger (13), the exhaust port of the compressor (11) is the outlet of the outdoor heat exchange path, and the second connection port of the external heat exchanger (13) is the inlet of the outdoor heat exchange path.

3. The air conditioning system according to claim 1 or 2, characterized in that, The outdoor unit (1) also includes an external multi-port valve (12) disposed on the outdoor heat exchange flow path; the first port of the external multi-port valve (12) is connected to the first port of the external heat exchanger (13), and the second port and the third port of the external multi-port valve (12) are connected to the suction port and the exhaust port of the compressor (11) respectively; wherein, the conduction state of the external multi-port valve (12) can be switched so that the air conditioning system can switch between cooling mode and heating mode.

4. The air conditioning system according to claim 3, characterized in that, The indoor unit (2) also includes a fresh air multi-way valve (21) and an internal multi-way valve (24). The first port of the fresh air multi-way valve (21) is connected to the inlet of the internal heat exchanger (22), the second port of the fresh air multi-way valve (21) is connected to the outlet of the fresh air heat exchanger (25), the first port of the internal multi-way valve (24) is connected to the inlet of the fresh air heat exchanger (25), the outlet of the internal heat exchanger (22) is connected to the second port of the internal multi-way valve (24), and the third port of the internal multi-way valve (24) is connected to the outlet of the fresh air heat exchanger (25). The third port of the fresh air multi-way valve (21) is connected to the fourth port of the external multi-way valve (12), and the fourth port of the fresh air multi-way valve (21) is connected to the second port of the external heat exchanger (13). The conduction states of the fresh air multi-way valve (21) and the internal multi-way valve (24) can be switched to allow the air conditioning system to switch between the cooling mode and the heating mode, and to enable or disable the fresh air pre-cooling / preheating function of the air conditioning system.

5. The air conditioning system according to claim 4, characterized in that, The fresh air pre-cooling / preheating function includes a fresh air pre-cooling function and a fresh air preheating function; When the first and third ports of the external multi-way valve (12) are open and the second and fourth ports are open, the first and fourth ports of the fresh air multi-way valve (21) are open and the second and third ports are open, and the first and second ports of the internal multi-way valve (24) are open, the air conditioning system is in the cooling mode and the fresh air pre-cooling function of the air conditioning system is activated; and / or, When the first and third ports of the external multi-way valve (12) are open and the second and fourth ports are open, the first and fourth ports of the fresh air multi-way valve (21) are open and the second and third ports are open, and the second and third ports of the internal multi-way valve (24) are open, the air conditioning system is in the cooling mode and the fresh air pre-cooling function of the air conditioning system is closed; and / or, When the first and second ports of the external multi-way valve (12) are open and the third and fourth ports are open, the first and third ports of the fresh air multi-way valve (21) are open and the second and fourth ports are open, and the first and second ports of the internal multi-way valve (24) are open, the air conditioning system is in the heating mode and the fresh air preheating function of the air conditioning system is activated; and / or, When the first and second ports of the external multi-port valve (12) are open and the third and fourth ports are open, the first and third ports of the fresh air multi-port valve (21) are open and the second and fourth ports are open, and the second and third ports of the internal multi-port valve (24) are open, the air conditioning system is in the heating mode and the fresh air preheating function of the air conditioning system is turned off.

6. An air conditioning control method, characterized in that, The air conditioning control method, applicable to any one of claims 1 to 5, comprises: When the air conditioning system is operating in refrigerant mode and the fresh air function is activated. acquire a first temperature T of fresh air at a fresh air inlet in the indoor unit (2) 新风进 and acquire a second temperature T of refrigerant at an outlet of the inner heat exchanger (22) 余进 ; According to the first temperature T 新风进 and the second temperature T 余进 Control whether the air conditioning system starts the fresh air pre-cooling / pre-heating function; The refrigerant operation mode includes a cooling mode and a heating mode, and the fresh air pre-cooling / preheating function includes a fresh air pre-cooling function and a fresh air preheating function corresponding to the cooling mode and the heating mode, respectively.

7. The air conditioning control method according to claim 6, characterized in that, The first temperature T 新风进 The second temperature T 余进 Controlling whether the air conditioning system starts the fresh air pre-cooling / pre-heating function, comprising: calculating a first temperature difference absolute value between the first temperature T 新风进 and the second temperature T 余进 ​ According to the first temperature T 新风进 The size between the first preset temperature T 新风预设 The size between the first temperature difference and the first preset temperature difference controls whether the air conditioning system starts the fresh air pre-cooling / pre-heating function.

8. The air conditioning control method according to claim 7, characterized in that, The first temperature difference absolute value is determined according to the first temperature T 新风进 The first temperature difference absolute value is determined according to the first temperature T 新风预设 The first temperature difference absolute value is determined according to the first temperature T The size between the first temperature difference absolute value and the first preset temperature difference value controls whether the air conditioning system starts the fresh air pre-cooling / pre-heating function. In the case that the air conditioning system operates in the refrigeration mode, the absolute value of the first temperature difference is ΔT 制冷01 , the first preset temperature difference value is ΔT 制冷1 , if T 新风进 ≥ T 新风预设 , and ΔT 制冷01 ≥ ΔT 制冷1 , the air conditioning system is controlled to start the fresh air precooling function; and / or, When the air conditioning system is operating in the heating mode, the absolute value of the first temperature difference is ΔT. 制热01 The first preset temperature difference is ΔT 制热1 If T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 Then, the air conditioning system is controlled to activate the fresh air preheating function.

9. The air conditioning control method according to claim 6, characterized in that, After the fresh air pre-cooling / preheating function is activated, the air conditioning control method further includes: acquiring a third temperature T of fresh air at a fresh air outlet in the indoor unit (2) 新风出 and a fourth temperature T of refrigerant at an outlet of the fresh air heat exchanger (25) 余出 ; According to the third temperature T 新风出 and the fourth temperature T 余出 Adjust the rotation speed of the fresh air fan (26) of the air conditioning system.

10. The air conditioning control method according to claim 9, characterized in that, According to the third temperature T 新风出 and the fourth temperature T 余出 Adjusting the speed of the fresh air fan (26) of the air conditioning system includes: Calculate the third temperature T 新风出 and the fourth temperature T 余出 The absolute value of the second temperature difference between them; The rotation speed of the fresh air fan (26) is adjusted according to the magnitude between the absolute value of the second temperature difference and the second preset temperature difference and the third preset temperature difference.

11. The air conditioning control method according to claim 10, characterized in that, When the air conditioning system activates the fresh air pre-cooling function or the fresh air pre-heating function, the fresh air fan (26) is controlled to rotate at an initial speed f; the adjustment of the speed of the fresh air fan (26) according to the magnitude between the absolute value of the second temperature difference and the second preset temperature difference and the third preset temperature difference includes: When the air conditioning system is operating in the cooling mode, the absolute value of the second temperature difference is ΔT. 制冷02 The second preset temperature difference is ΔT 制冷2 The third preset temperature difference value is ΔT 制冷3 ; where, if ΔT 制冷02 ≥ΔT 制冷2 Then, control the fresh air fan (26) to increase the first speed Δα based on the initial speed f; if ΔT 制冷2 >ΔT 制冷02 >ΔT 制冷3 Then control the fresh air fan (26) to maintain the initial speed f unchanged; if ΔT 制冷02 ≤ΔT 制冷3 Then, the fresh air fan (26) is controlled to decrease the second speed Δβ based on the initial speed f; and / or, When the air conditioning system is operating in the heating mode, the absolute value of the second temperature difference is ΔT. 制热02 The second preset temperature difference is ΔT 制热2 The third preset temperature difference value is ΔT 制热3 ; where, if ΔT 制热02 ≥ΔT 制热2 Then, control the fresh air fan (26) to increase the first speed Δα based on the initial speed f; if ΔT 制热2 >ΔT 制热02 >ΔT 制热3 Then control the fresh air fan (26) to maintain the initial speed f unchanged; if ΔT 制热02 ≤ΔT 制热3 Then, the fresh air fan (26) is controlled to reduce the second speed Δβ based on the initial speed f.

12. The air conditioning control method according to claim 9, characterized in that, According to the third temperature T 新风出 and the fourth temperature T 余出 After adjusting the speed of the fresh air fan (26), when the fresh air fan (26) continues to run for a first preset time t1, the air conditioning control method further includes: The first temperature T is obtained again. 新风进 and the second temperature T 余进 ; According to the first temperature T 新风进 and the second temperature T 余进 Control whether the air conditioning system continues to keep the fresh air pre-cooling / preheating function on.

13. The air conditioning control method according to claim 12, characterized in that, The first temperature T 新风进 and the second temperature T 余进 Controlling whether the air conditioning system continues to maintain the fresh air pre-cooling / preheating function includes: Calculate the first temperature T 新风进 and the second temperature T 余进 The absolute value of the first temperature difference between them; According to the first temperature T 新风进 With the first preset temperature T 新风预设 The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference with the first preset temperature difference control whether the air conditioning system continues to keep the fresh air pre-cooling / preheating function on.

14. The air conditioning control method according to claim 13, characterized in that, The first temperature T 新风进 With the first preset temperature T 新风预设 The magnitude of the temperature difference and the magnitude of the absolute value of the first temperature difference with the first preset temperature difference control whether the air conditioning system continues to keep the fresh air pre-cooling / preheating function on, including: When the air conditioning system is operating in the cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 The first preset temperature difference is ΔT 制冷1 If T 新风进 ≥T 新风预设 And ΔT 制冷01 ≥ΔT 制冷1 Then, the air conditioning system will continue to operate the fresh air pre-cooling function, and will continue to operate according to the third temperature T. 新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan (26) of the air conditioning system; if T 新风进 <T 新风预设 or ΔT 制冷01 <ΔT 制冷1 Then, control the air conditioning system to turn off the fresh air pre-cooling function; and / or, When the air conditioning system is operating in the heating mode, the absolute value of the first temperature difference is ΔT. 制热01 The first preset temperature difference is ΔT 制热1 If T 新风进 ≤T 新风预设 And ΔT 制热01 ≥ΔT 制热1 Then, the air conditioning system is controlled to continue to operate the fresh air preheating function, and continues to operate according to the third temperature T. 新风出 and the fourth temperature T 余出 Adjust the speed of the fresh air fan (26) of the air conditioning system; if T 新风进 >T 新风预设 or ΔT 制热01 <ΔT 制热1 If so, the air conditioning system will be controlled to turn off the fresh air preheating function.

15. The air conditioning control method according to claim 7, 8, 13, or 14, characterized in that, When the air conditioning system is operating in the cooling mode, the absolute value of the first temperature difference is ΔT. 制冷01 While activating the fresh air pre-cooling function, the speed of the fresh air fan (26) of the air conditioning system is switched to the initial speed f; when ΔT 制冷01 At ≥25℃, f=1200rpm; when 20℃≤ΔT 制冷01 When <25℃, f=1000rpm; when 16℃≤ΔT 制冷01 At <20℃, f=900rpm; when ΔT 制冷01 At <16℃, f=800rpm; and / or, When the air conditioning system is operating in the heating mode, the absolute value of the first temperature difference is ΔT. 制热01 While activating the fresh air preheating function, the speed of the fresh air fan (26) of the air conditioning system is switched to the initial speed f; when ΔT 制热01 When the temperature is ≥30℃, f=1200rpm; when the temperature is 25℃≤ΔT 制热01 When <30℃, f=1000rpm; when 21℃≤ΔT 制热01 At <25℃, f=900rpm; when ΔT 制热01 At <21℃, f=800rpm.

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