An air conditioning system and its control method

Abstract

This invention provides an air conditioning system and its control method. The air conditioning system includes a compressor, a liquid storage device, a first outdoor heat exchanger, a first indoor heat exchanger, and a water tank heat exchanger. One end of each of the water tank heat exchanger, the first outdoor heat exchanger, and the first indoor heat exchanger is connected to the liquid storage device, and the other end of each can be selectively connected to the compressor's suction port or exhaust port. Each of the three devices has its own piping that can be opened or closed, and each pair of the three devices has a throttling device, enabling the air conditioning system to have cooling mode, heating mode, hot water mode, cooling and hot water mode, and heating and hot water mode. The liquid storage device of this invention can adjust the amount of refrigerant circulating within the air conditioning system in different modes. The liquid storage device, in conjunction with the throttling device, can rationally distribute the refrigerant during operation of the air conditioning system in different modes.

Description

Technical Field

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

[0002] It is predicted that global air conditioning installed capacity will double by 2050 compared to 2022. The surge in demand for air conditioning will lead to a surge in peak annual electricity consumption and annual carbon emissions, creating a vicious cycle with global warming. On the other hand, during the summer cooling season, the condensation heat of the outdoor unit of the air conditioner is not fully utilized, releasing a large amount of heat into the environment. How to utilize this heat energy has become an urgent problem to be solved.

[0003] In order to utilize condensation heat, current air conditioning systems generally recover condensation heat by producing hot water, so that the air conditioning system has the function of producing hot water in addition to heating and cooling. However, when the air conditioning system is running in different modes, how to reasonably distribute the refrigerant has become a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] Therefore, the present invention provides an air conditioning system and its control method, which can solve the refrigerant distribution problem when the air conditioning system is running in different modes.

[0005] To address the above problems, the present invention provides an air conditioning system comprising a compressor, a liquid storage device, a first outdoor heat exchanger, a first indoor heat exchanger, and a water tank heat exchanger.

[0006] One end of each of the water tank heat exchanger, the first outdoor heat exchanger, and the first indoor heat exchanger is connected to the liquid storage device, and the other end of each of them can be selectively connected to the suction port or the exhaust port of the compressor. Each of the three pipes can be opened or closed, and each of the three pipes has a throttling device, so that the air conditioning system has a cooling mode, a heating mode, a hot water mode, a cooling and hot water mode, and a heating and hot water mode.

[0007] The liquid storage device can adjust the amount of refrigerant circulating in the air conditioning system under different modes.

[0008] The air conditioning system also includes a total heat exchanger, a fresh air duct, and an exhaust air duct. The fresh air duct and the exhaust air duct exchange heat and moisture through the total heat exchanger.

[0009] In some embodiments, the liquid storage device includes a liquid storage tank, which is connected to one end of each of the water tank heat exchanger, the first outdoor heat exchanger, and the first indoor heat exchanger. The liquid storage device adjusts the amount of refrigerant circulating in the air conditioning system through the liquid storage tank in different modes of the air conditioning system.

[0010] In some embodiments, in the cooling mode, the pipes of the water tank heat exchanger are closed, the pipes of both the first outdoor heat exchanger and the first indoor heat exchanger are open, and the other end of the first indoor heat exchanger is connected to the suction port of the compressor, and the other end of the first outdoor heat exchanger is connected to the discharge port of the compressor.

[0011] And / or, in the cooling and hot water production mode, the pipes of the first outdoor heat exchanger are closed, the pipes of both the water tank heat exchanger and the first indoor heat exchanger are open, and the other end of the water tank heat exchanger is connected to the exhaust port of the compressor, and the other end of the first indoor heat exchanger is connected to the suction port of the compressor.

[0012] And / or, in the hot water production mode, the pipes of the first indoor heat exchanger are closed, the pipes of both the water tank heat exchanger and the first outdoor heat exchanger are open, and the other end of the water tank heat exchanger is connected to the exhaust port of the compressor, and the other end of the first outdoor heat exchanger is connected to the suction port of the compressor.

[0013] And / or, in the heating mode, the pipes of the water tank heat exchanger are closed, the pipes of both the first outdoor heat exchanger and the first indoor heat exchanger are open, the other end of the first indoor heat exchanger is connected to the exhaust port of the compressor, and the other end of the first outdoor heat exchanger is connected to the suction port of the compressor.

[0014] And / or, in the heating and hot water production mode, the other end of the water tank heat exchanger is connected to the exhaust port of the compressor, the other end of the first indoor heat exchanger is connected to the exhaust port of the compressor, and the other end of the first outdoor heat exchanger is connected to the intake port of the compressor.

[0015] In some embodiments, the throttling device is provided on the pipeline of the water tank heat exchanger. The throttling device is a first throttling valve, which is located on the side of the water tank heat exchanger near the liquid storage device. The first throttling valve is used to control the opening or closing of the pipeline of the water tank heat exchanger.

[0016] And / or, the first outdoor heat exchanger is provided with the throttling device on its pipeline, the throttling device being a second throttling valve, the second throttling valve being located on the side of the first outdoor heat exchanger closer to the liquid storage device, the second throttling valve being used to control the opening or closing of the pipeline of the first outdoor heat exchanger;

[0017] And / or, the first indoor heat exchanger is provided with the throttling device on its pipeline, the throttling device being a third throttling valve, the third throttling valve being located on the side of the first indoor heat exchanger near the liquid storage device, the third throttling valve being used to control the opening or closing of the pipeline of the first indoor heat exchanger.

[0018] In some embodiments, the air conditioning system further includes a second indoor heat exchanger; the second indoor heat exchanger is located downstream of the first indoor heat exchanger along the airflow direction; wherein the second indoor heat exchanger is used to connect to the piping of the air conditioning system so that the air conditioning system also has a temperature-regulating and dehumidifying mode; in the temperature-regulating and dehumidifying mode, the first indoor heat exchanger cools and the second indoor heat exchanger heats.

[0019] In some embodiments, one end of the second indoor heat exchanger is connected to the liquid storage device, and the other end is optionally connected to the suction port or exhaust port of the compressor. The pipeline of the second indoor heat exchanger can be opened or closed, and the pipeline between the second indoor heat exchanger and the first indoor heat exchanger also has a throttling device.

[0020] In some embodiments, in the temperature-regulating and dehumidifying mode, the pipes of the first outdoor heat exchanger, the first indoor heat exchanger, and the second indoor heat exchanger are all open, and the other end of the first indoor heat exchanger is connected to the air intake of the compressor, the other ends of the first outdoor heat exchanger and the second indoor heat exchanger are both connected to the exhaust port of the compressor, the pipes of the water tank heat exchanger are open or closed, and the other end of the water tank heat exchanger is connected to the exhaust port of the compressor when the pipes of the water tank heat exchanger are open;

[0021] And / or, in the cooling mode and the cooling and hot water production mode, the pipe of the second indoor heat exchanger is opened, and the other end of the second indoor heat exchanger is connected to the suction port of the compressor; in the heating mode, the pipe of the second indoor heat exchanger is opened, and the other end of the second indoor heat exchanger is connected to the discharge port of the compressor; in the hot water production mode and the heating and hot water production mode, the pipe of the second indoor heat exchanger is closed.

[0022] In some embodiments, when the throttling device is provided on the piping of the first indoor heat exchanger, the throttling device being a third throttling valve, the third throttling valve being located on the side of the first indoor heat exchanger closer to the liquid storage device, and the third throttling valve being used to control the opening or closing of the piping of the first indoor heat exchanger,

[0023] One end of the second indoor heat exchanger is connected to the liquid storage device through the third throttle valve, and a fourth throttle valve is also provided on the pipeline between the second indoor heat exchanger and the third throttle valve; wherein, the fourth throttle valve serves as a throttling device on the pipeline between the second indoor heat exchanger and the first indoor heat exchanger; the third throttle valve and the fourth throttle valve work together to control the opening or closing of the pipeline of the second indoor heat exchanger.

[0024] In some embodiments, the air conditioning system also has a heat storage defrosting mode, in which the first outdoor heat exchanger heats and the water tank heat exchanger cools.

[0025] In some embodiments, when the air conditioning system further includes a second indoor heat exchanger, in the heat storage defrosting mode, the pipes of the first indoor heat exchanger are open, the pipes of the second indoor heat exchanger are closed, the pipes of both the water tank heat exchanger and the first outdoor heat exchanger are open, and the other end of the water tank heat exchanger is connected to the air intake of the compressor, and the other end of the first outdoor heat exchanger is connected to the exhaust port of the compressor.

[0026] In some embodiments, the compressor has a first compression section and a second compression section, and the exhaust gases from both the first compression section and the second compression section are combined and discharged from the compressor's exhaust port; the first compression section has a first intake port, and the second compression section has a second intake port, and the compressor's intake port includes the first intake port and the second intake port; wherein, the compressor simultaneously draws air through the first intake port and the second intake port in different modes of the air conditioning system.

[0027] In some embodiments, the air conditioning system further includes a first four-way reversing valve, a second four-way reversing valve, and a one-way valve;

[0028] The compressor's exhaust port is connected to both the D-pipe of the first four-way reversing valve and the D-pipe of the second four-way reversing valve. The S-pipe of the first four-way reversing valve is connected to the second intake port, and the S-pipe of the first four-way reversing valve is connected to the inlet of the one-way valve. The outlet of the one-way valve is connected to the C-pipe of the second four-way reversing valve. The E-pipe of the first four-way reversing valve is connected to the other end of the first indoor heat exchanger, and the C-pipe of the first four-way reversing valve is connected to the other end of the first outdoor heat exchanger. The E-pipe of the second four-way reversing valve is connected to the other end of the water tank heat exchanger, and the S-pipe of the second four-way reversing valve is connected to the first intake port.

[0029] In some embodiments, when the air conditioning system further includes a second indoor heat exchanger, and one end of the second indoor heat exchanger is connected to the liquid storage device, and the other end is selectively connected to the suction port or exhaust port of the compressor, the other end of the second indoor heat exchanger is connected to the E pipe of the second four-way reversing valve, so as to selectively connect to the suction port or exhaust port of the compressor through the second four-way reversing valve.

[0030] In some embodiments, in the cooling mode, the E pipe of the first four-way reversing valve is connected to the S pipe of the first four-way reversing valve, and the D pipe of the first four-way reversing valve is connected to the C pipe of the first four-way reversing valve; the D pipe of the second four-way reversing valve is connected to the C pipe of the second four-way reversing valve, and the E pipe of the second four-way reversing valve is connected to the S pipe of the second four-way reversing valve.

[0031] And / or, in the cooling and hot water production mode, the E pipe of the first four-way reversing valve is connected to the S pipe of the first four-way reversing valve, and the D pipe of the first four-way reversing valve is connected to the C pipe of the first four-way reversing valve; the D pipe of the second four-way reversing valve is connected to the E pipe of the second four-way reversing valve, and the C pipe of the second four-way reversing valve is connected to the S pipe of the second four-way reversing valve.

[0032] And / or, in the hot water production mode, the E pipe of the first four-way reversing valve is connected to the D pipe of the first four-way reversing valve, and the S pipe of the first four-way reversing valve is connected to the C pipe of the first four-way reversing valve; the D pipe of the second four-way reversing valve is connected to the E pipe of the second four-way reversing valve, and the C pipe of the second four-way reversing valve is connected to the S pipe of the second four-way reversing valve.

[0033] And / or, in the heating mode, the E pipe of the first four-way reversing valve is connected to the D pipe of the first four-way reversing valve, and the S pipe of the first four-way reversing valve is connected to the C pipe of the first four-way reversing valve; the D pipe of the second four-way reversing valve is connected to the E pipe of the second four-way reversing valve, and the C pipe of the second four-way reversing valve is connected to the S pipe of the second four-way reversing valve.

[0034] And / or, in the heating and hot water production mode, the E pipe of the first four-way reversing valve is connected to the D pipe of the first four-way reversing valve, and the S pipe of the first four-way reversing valve is connected to the C pipe of the first four-way reversing valve; the D pipe of the second four-way reversing valve is connected to the E pipe of the second four-way reversing valve, and the C pipe of the second four-way reversing valve is connected to the S pipe of the second four-way reversing valve.

[0035] And / or, when the air conditioning system includes a temperature-regulating and dehumidifying mode, in the temperature-regulating and dehumidifying mode, the E pipe of the first four-way reversing valve is connected to the S pipe of the first four-way reversing valve, and the D pipe of the first four-way reversing valve is connected to the C pipe of the first four-way reversing valve; the D pipe of the second four-way reversing valve is connected to the E pipe of the second four-way reversing valve, and the C pipe of the second four-way reversing valve is connected to the S pipe of the second four-way reversing valve.

[0036] And / or, when the air conditioning system includes a heat storage defrosting mode, in the heat storage defrosting mode, the E pipe of the first four-way reversing valve is connected to the S pipe of the first four-way reversing valve, and the D pipe of the first four-way reversing valve is connected to the C pipe of the first four-way reversing valve; the D pipe of the second four-way reversing valve is connected to the C pipe of the second four-way reversing valve, and the E pipe of the second four-way reversing valve is connected to the S pipe of the second four-way reversing valve.

[0037] In some embodiments, the compressor further includes a third compression section, the exhaust of which is also discharged through the compressor's exhaust port. The third compression section has a third intake port, which is connected to the liquid storage device.

[0038] In some embodiments, the air conditioning system further includes a second outdoor heat exchanger, the second outdoor heat exchanger and the first outdoor heat exchanger operating in the same state; at least one of the first outdoor heat exchanger and the second outdoor heat exchanger is located in the exhaust duct;

[0039] And / or, the first indoor heat exchanger is located within the fresh air duct.

[0040] In some embodiments, when the air conditioning system further includes a second outdoor heat exchanger, and the first outdoor heat exchanger is provided with the throttling device on its pipeline, wherein the throttling device is a second throttling valve, the first outdoor heat exchanger is connected to the second throttling valve to form a first branch, the second outdoor heat exchanger is connected to the fifth throttling valve to form a second branch, and the first branch and the second branch are connected in parallel.

[0041] In some embodiments, when the throttling device includes a third throttling valve, and the third throttling valve is disposed on the pipeline between the first indoor heat exchanger and the liquid storage device, the third throttling valve and the first indoor heat exchanger are connected to form a third branch;

[0042] The number of the third branch is two or more, and they are connected in parallel in sequence; wherein, each of the first indoor heat exchangers in the third branch is used to be installed in a different room.

[0043] In some embodiments, when the air conditioning system further includes a second indoor heat exchanger, and a fourth throttling valve is provided on the pipeline between the second indoor heat exchanger and the third throttling valve, the fourth throttling valve and the second indoor heat exchanger are connected to form a fifth branch.

[0044] The number of fifth branches is equal to the number of third branches, and each fifth branch is arranged in parallel in sequence. Each second indoor heat exchanger in the fifth branch corresponds to each first indoor heat exchanger in the third branch.

[0045] In some embodiments, the fresh air duct includes a fresh air branch section located downstream of the total heat exchanger, and each different room is provided with the fresh air branch section, and the first indoor heat exchanger of each different room is located in the fresh air branch section of the corresponding room.

[0046] The present invention also provides a control method for any of the above-mentioned air conditioning systems, wherein the air conditioning system simultaneously includes a first four-way reversing valve, a second four-way reversing valve, a first throttle valve, a second throttle valve, a third throttle valve, a fourth throttle valve, and a check valve; the control method includes:

[0047] Obtain the operating mode of the air conditioning system;

[0048] Based on the obtained operating mode, the first four-way reversing valve and the second four-way reversing valve are controlled to be energized or de-energized respectively, and the opening and closing of the first throttle valve, the second throttle valve, the third throttle valve and the fourth throttle valve are controlled respectively.

[0049] In some embodiments, the air conditioning system has a fresh air fan that draws air into the room through the fresh air duct;

[0050] Specifically, when the air conditioning system is in the heating mode, the fresh air fan is turned on only when the surface temperature of the first indoor heat exchanger is greater than or equal to a set value.

[0051] And / or, when the air conditioning system is in heating and hot water production mode, or in temperature adjustment and dehumidification mode with the water tank heat exchanger pipes open, if the water temperature in the water tank is lower than the first preset value and / or the surface temperature of the first indoor heat exchanger is lower than the second preset value, the fresh air fan will be stopped; if only one of the following conditions is met: the water temperature in the water tank is greater than or equal to the first preset value or the surface temperature of the first indoor heat exchanger is greater than or equal to the second preset value, the fresh air fan will be controlled to run at low speed; if the water temperature in the water tank is greater than or equal to the first preset value and the surface temperature of the first indoor heat exchanger is greater than or equal to the second preset value, the fresh air fan will be controlled to run at high speed.

[0052] And / or, when the air conditioning system has a heat storage defrosting mode, and the air conditioning system is running in the heat storage defrosting mode, the fresh air fan is controlled to stop operating;

[0053] And / or, when the air conditioning system is operating in the cooling mode for conventional defrosting, the fresh air fan is controlled to stop operating.

[0054] In some implementations, when the air conditioning system has a heat storage defrosting mode and the outdoor heat exchanger needs to be defrosted, the water temperature in the water tank is first detected. If the water temperature in the water tank is lower than the preset temperature, the air conditioning system is controlled to operate in cooling mode to perform conventional defrosting. If the water temperature in the water tank is greater than or equal to the preset temperature, the air conditioning system is controlled to operate in heat storage defrosting mode.

[0055] In some implementations, when the air conditioning system is operating in the heat storage defrosting mode, if the water temperature in the water tank is lower than the preset temperature, the air conditioning system is switched to the cooling mode for conventional defrosting.

[0056] The air conditioning system and control method provided by this invention have the following beneficial effects:

[0057] 1. The liquid storage device of the present invention can adjust the amount of refrigerant circulating in the air conditioning system under different modes. For example, when the amount of refrigerant required for circulation in the air conditioning system decreases, the liquid storage device can reduce the refrigerant output and store the excess refrigerant inside itself. When the amount of refrigerant required for circulation in the air conditioning system increases, the liquid storage device can use the internally stored refrigerant to increase the refrigerant output. Thus, the liquid storage device, in conjunction with the throttling device, can rationally distribute the refrigerant in the air conditioning system when it operates under different modes.

[0058] 2. The air conditioning system of the present invention can produce hot water in hot water production mode, cooling and hot water production mode, and heating and hot water production mode, thereby effectively utilizing condensation heat. While improving energy efficiency, it can reduce the additional cost of producing domestic hot water, making it economical and environmentally friendly. It solves the problem of waste heat being discharged outdoors and condensation heat not being fully utilized and energy efficiency being low when conventional air conditioning systems are operating normally.

[0059] 3. When dehumidification is required during the transitional season, the first indoor heat exchanger of this invention can function as a separate evaporator to cool and dehumidify the indoor air, while the second indoor heat exchanger functions as a low-temperature condenser to reheat the cooled and dehumidified air, increasing the supply air temperature and improving indoor comfort. This solves the problem of low comfort and high energy consumption caused by excessively low outlet air temperature and evaporation temperature during dehumidification operation in humid regions during the transitional season. Furthermore, it also addresses the issue of conventional air conditioning systems requiring an additional reheat heat exchanger, which complicates the system and increases costs.

[0060] 4. In the heat storage defrosting mode, the air conditioning system can achieve heat storage defrosting in winter by using the heat stored in the water tank during daily hot water production, which shortens the defrosting cycle and reduces the fluctuation of indoor ambient temperature during heating operation. Attached Figure Description

[0061] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0062] Figure 1 This is a schematic diagram of the air conditioning system of the present invention operating in cooling mode;

[0063] Figure 2 This is a schematic diagram of the air conditioning system of the present invention operating in cooling and hot water production modes;

[0064] Figure 3 This is a schematic diagram of the air conditioning system of the present invention operating in hot water production mode;

[0065] Figure 4 This is a schematic diagram of the air conditioning system of the present invention operating in heating mode;

[0066] Figure 5 This is a schematic diagram of the air conditioning system of the present invention operating in heating and hot water production modes;

[0067] Figure 6 This is a schematic diagram of the air conditioning system of the present invention operating in temperature regulation and dehumidification mode with the pipeline of the water tank heat exchanger closed;

[0068] Figure 7 This is a schematic diagram of the air conditioning system of the present invention operating in temperature regulation and dehumidification mode with the pipeline of the water tank heat exchanger open;

[0069] Figure 8 This is a schematic diagram of the air conditioning system of the present invention operating in conventional defrosting mode;

[0070] Figure 9 This is a schematic diagram of the air conditioning system of the present invention operating in heat storage defrosting mode;

[0071] Figure 10 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention;

[0072] Figure 11 This is a schematic diagram of another air conditioning system provided in an embodiment of the present invention.

[0073] The attached figures are labeled as follows:

[0074] 10. Compressor; 13. Exhaust port; 11. First intake port; 12. Second intake port; 31. Second outdoor heat exchanger; 32. First outdoor heat exchanger; 51. Second throttle valve; 52. Third throttle valve; 53. First throttle valve; 54. Fourth throttle valve; 56. Fifth throttle valve; 41. First indoor heat exchanger; 42. Second indoor heat exchanger; 21. Second four-way reversing valve; 22. First four-way reversing valve; 91. Second fan; 92. Fresh air fan; 94. First fan; 55. Check valve; 61. Liquid storage device; 83. Water tank heat exchanger; 84. Water tank; 81. Water inlet; 82. Water outlet; 85. Refrigerant inlet; 86. Refrigerant outlet; 71. Purification device; 72. Exhaust duct; 73. Total heat exchanger; 74. Fresh air duct; 75. Fresh air branch section. Detailed Implementation

[0075] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0076] In the description of this invention, 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 generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention 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 invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0077] 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.

[0078] 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 should not be construed as limiting the scope of protection of this invention.

[0079] See also Figure 1-9As shown, according to an embodiment of the present invention, an air conditioning system is provided, comprising a compressor 10, a liquid storage device 61, a first outdoor heat exchanger 32, a first indoor heat exchanger 41, and a water tank heat exchanger 83. The water tank heat exchanger 83 is disposed within a water tank 84 and may be in the form of a spiral coil. The water tank heat exchanger 83 has a refrigerant inlet 85 and a refrigerant outlet 86. The water tank 84 has a water inlet 81 and a water outlet 82. One end of each of the water tank heat exchanger 83, the first outdoor heat exchanger 32, and the first indoor heat exchanger 41 is connected to the liquid storage device 61, and the other end of each of the three can be selectively connected to the suction port or the exhaust port 13 of the compressor 10. The pipes of each of the three can be opened or closed, and each pair of the three has a throttling device on the pipes, so that the air conditioning system of the present invention can simultaneously have a cooling mode, a heating mode, a hot water mode, a cooling and hot water mode, and a heating and hot water mode.

[0080] The air conditioning system of this invention can cool the indoor space in cooling mode, heat the indoor space in heating mode, and produce hot water in hot water mode. It can also simultaneously cool and produce hot water in both cooling and hot water modes, and simultaneously heat and produce hot water in both heating and hot water modes. The air conditioning system of this invention can achieve normal air conditioning functions in both heating and cooling modes. It can produce hot water in all three modes (hot water, cooling and hot water, and heating and hot water), thus effectively utilizing condensation heat. This improves energy efficiency and reduces the cost of producing additional domestic hot water, making it economical and environmentally friendly. It solves the problems of conventional air conditioning systems that discharge waste heat outdoors, underutilize condensation heat, and have low energy efficiency during normal operation.

[0081] Within the aforementioned air conditioning system, the liquid storage device 61 can adjust the amount of refrigerant circulating within the air conditioning system in various modes. In a specific application example, the liquid storage device 61 may include a liquid storage tank, which is connected to one end of each of the water tank heat exchanger 83, the first outdoor heat exchanger 32, and the first indoor heat exchanger 41, respectively. Furthermore, the liquid storage device 61 adjusts the amount of refrigerant circulating within the air conditioning system in various modes through the liquid storage tank.

[0082] In the above example, the liquid receiver 61 can adjust the amount of refrigerant circulating in the air conditioning system under different modes. For example, when the amount of refrigerant required for circulation in the air conditioning system decreases, the liquid receiver 61 can reduce the refrigerant output and store the excess refrigerant inside itself. When the amount of refrigerant required for circulation in the air conditioning system increases, the liquid receiver 61 can use the internally stored refrigerant to increase the refrigerant output. Thus, the liquid receiver 61, in conjunction with the throttling device, can rationally distribute the refrigerant in the air conditioning system when it operates in different modes.

[0083] It should be noted that the optimal refrigerant charge varies depending on the operating mode of the air conditioning system. The optimal charge in cooling mode tends to be higher in heating mode. Therefore, to ensure the air conditioning system operates optimally in all modes, this invention adds a liquid storage device 61 to adjust the refrigerant circulation in the air conditioning system under different modes. Its advantage is that it can adjust the optimal refrigerant circulation flow rate in the air conditioning system.

[0084] In this system, when the liquid storage device 61 adjusts the amount of refrigerant circulating in the air conditioning system under different modes via the liquid storage tank, the throttling devices on the pipelines between each pair of the water tank heat exchanger 83, the first outdoor heat exchanger 32, and the first indoor heat exchanger 41 can all be throttling valves. Under rated cooling conditions, the liquid storage tank optimizes the refrigerant charge to the air conditioning system. However, in hot water and heating modes, the air conditioning system requires less refrigerant. Therefore, by adjusting the opening of the throttling valve upstream of the liquid storage tank, the subcooling of the air conditioning system can be adjusted, reducing the amount of refrigerant circulating in the system. The excess refrigerant is stored in the liquid storage tank, reducing condensing pressure and improving system energy efficiency.

[0085] Specifically: a first throttling valve 53 is installed on the pipes of the water tank heat exchanger 83; a second throttling valve 51 is installed on the pipes of the first outdoor heat exchanger 32; and a third throttling valve 52 is installed on the pipes of the first indoor heat exchanger 41. When a second indoor heat exchanger 42 is installed downstream of the first indoor heat exchanger 41 along the airflow direction, a fourth throttling valve 54 is installed on the pipe between the second indoor heat exchanger 42 and the third throttling valve 52. In cooling mode only, adjusting the second, third, and fourth throttling valves 51, 52, and 54 optimizes the superheat and energy efficiency of the air conditioning system. In heating mode only, because the volume of the indoor heat exchanger is generally smaller than that of the outdoor heat exchanger, there is more refrigerant in the air conditioning system, with some refrigerant stored in the receiver tank. Adjusting the second, third, and fourth throttling valves 51 and 54 allows the air conditioning system to operate near its optimal level. When operating in both cooling and hot water modes, the refrigerant level in the system is higher than that in the outdoor heat exchanger because the capacity of the water tank heat exchanger 83 is smaller than that of the outdoor heat exchanger. Therefore, the refrigerant level in the storage tank can be increased by adjusting the third throttle valve 52, the fourth throttle valve 54, and the first throttle valve 53, thus reducing the amount of refrigerant circulating in the system. When operating in hot water only mode, the liquid level in the storage tank can be further increased by adjusting the second throttle valve 51 and the first throttle valve 53. When operating in both heating and hot water modes, the liquid level in the storage tank decreases, and its filling amount is similar to that in cooling mode. When operating in temperature control and dehumidification mode, its filling amount is similar to that in cooling mode.

[0086] It should be noted that the water tank heat exchanger 83 mentioned above is installed inside the water tank 84 to heat the water inside the water tank 84, thereby producing hot water.

[0087] The air conditioning system of the present invention further includes a total heat exchanger 73, a fresh air duct 74 and an exhaust air duct 72, wherein the fresh air duct 74 and the exhaust air duct 72 exchange heat and moisture between the fresh air and the exhaust air through the total heat exchanger 73.

[0088] By adding a total heat exchanger 73, part of the cooling or heating energy of the indoor exhaust air can be recovered, thereby improving the system's energy efficiency.

[0089] In order to enable the other ends of the aforementioned water tank heat exchanger 83, the first outdoor heat exchanger 32 and the first indoor heat exchanger 41 to be selectively connected to the suction port or the exhaust port 13 of the compressor 10, and to enable the pipes of the water tank heat exchanger 83, the first outdoor heat exchanger 32 and the first indoor heat exchanger 41 to be opened or closed, so that the air conditioning system can simultaneously have the functions of cooling mode, heating mode, hot water mode, cooling and hot water mode and heating and hot water mode, it can be specifically achieved in the following ways.

[0090] Specifically, in some implementation methods, such as Figure 1As shown, in cooling mode, the pipes of the water tank heat exchanger 83 are closed, and the pipes of both the first outdoor heat exchanger 32 and the first indoor heat exchanger 41 are open. The other end of the first indoor heat exchanger 41 is connected to the suction port of the compressor 10, and the other end of the first outdoor heat exchanger 32 is connected to the discharge port 13 of the compressor.

[0091] The connection method described above in the cooling mode enables the water tank heat exchanger 83 to stop working in the cooling mode, while the first indoor heat exchanger 41 cools and the second outdoor heat exchanger 31 heats, thereby realizing the cooling function of the air conditioning system in the cooling mode.

[0092] In some implementations, such as Figure 2 As shown, in the cooling and hot water production mode, the pipes of the first outdoor heat exchanger 32 are closed, and the pipes of both the water tank heat exchanger 83 and the first indoor heat exchanger 41 are open. The other end of the water tank heat exchanger 83 is connected to the exhaust port 13 of the compressor, and the other end of the first indoor heat exchanger 41 is connected to the suction port of the compressor 10.

[0093] The connection method described above for both cooling and hot water production modes allows the first outdoor heat exchanger 32 to remain inactive during both modes, while the first indoor heat exchanger 41 cools and the water tank heat exchanger 83 heats, thus enabling the air conditioning system to simultaneously perform both cooling and hot water production functions in both modes.

[0094] In some implementations, such as Figure 3 As shown, in hot water production mode, the pipes of the first indoor heat exchanger 41 are closed, and the pipes of both the water tank heat exchanger 83 and the first outdoor heat exchanger 32 are open. The other end of the water tank heat exchanger 83 is connected to the exhaust port 13 of the compressor, and the other end of the first outdoor heat exchanger 32 is connected to the suction port of the compressor 10.

[0095] In this hot water production mode, the connection method described above enables the first indoor heat exchanger 41 to stop working, the first outdoor heat exchanger 32 to cool, and the water tank heat exchanger 83 to heat, thereby realizing the hot water production function of the air conditioning system in the hot water production mode.

[0096] In some implementations, in the heating mode, such as Figure 4 As shown, the pipeline of the water tank heat exchanger 83 is closed, and the pipelines of both the first outdoor heat exchanger 32 and the first indoor heat exchanger 41 are open. The other end of the first indoor heat exchanger 41 is connected to the exhaust port 13 of the compressor, and the other end of the first outdoor heat exchanger 32 is connected to the suction port of the compressor 10.

[0097] The connection method described above in the heating mode enables the water tank heat exchanger 83 to stop working in the heating mode, while the first outdoor heat exchanger 32 cools and the first indoor heat exchanger 41 heats, thereby realizing the heating function of the air conditioning system in the heating mode.

[0098] In some implementations, such as Figure 5 As shown, in heating and hot water production modes, the other end of the water tank heat exchanger 83 is connected to the compressor exhaust port 13, the other end of the first indoor heat exchanger 41 is connected to the compressor exhaust port 13, and the other end of the first outdoor heat exchanger 32 is connected to the compressor intake port 10.

[0099] The connection method described above for heating and hot water production modes enables the first outdoor heat exchanger 32 to cool while the water tank heat exchanger 83 and the first indoor heat exchanger 41 both heat in the heating and hot water production modes, thereby enabling the air conditioning system to simultaneously produce heat and hot water in both modes.

[0100] To enable the opening or closing of the piping in the aforementioned water tank heat exchanger 83, in some embodiments, such as... Figure 1 As shown, the aforementioned throttling device is provided on the pipeline of the water tank heat exchanger 83. This throttling device is a first throttling valve 53, which is located on the side of the water tank heat exchanger 83 near the liquid storage device 61. The first throttling valve 53 is used to control the opening or closing of the pipeline of the water tank heat exchanger 83. Specifically, when the first throttling valve 53 is open, the pipeline of the water tank heat exchanger 83 is opened; when the first throttling valve 53 is closed, the pipeline of the water tank heat exchanger 83 is closed.

[0101] To enable the piping of the aforementioned first outdoor heat exchanger 32 to be opened or closed, in some embodiments, such as Figure 1 As shown, the aforementioned throttling device, a second throttling valve 51, is installed on the pipeline of the first outdoor heat exchanger 32. The second throttling valve 51 is located on the side of the first outdoor heat exchanger 32 closest to the liquid storage device 61. The second throttling valve 51 is used to control the opening or closing of the pipeline of the first outdoor heat exchanger 32. Specifically, when the second throttling valve 51 is open, the pipeline of the first outdoor heat exchanger 32 is opened; when the second throttling valve 51 is closed, the pipeline of the first outdoor heat exchanger 32 is closed.

[0102] In some implementations, such as Figure 1As shown, the aforementioned throttling device, a third throttling valve 52, is provided on the pipeline of the first indoor heat exchanger 41. The third throttling valve 52 is located on the side of the first indoor heat exchanger 41 near the liquid storage device 61, and is used to control the opening or closing of the pipeline of the first indoor heat exchanger 41. Specifically, when the third throttling valve 52 is open, the pipeline of the first indoor heat exchanger 41 is opened; when the third throttling valve 52 is closed, the pipeline of the first indoor heat exchanger 41 is closed.

[0103] In some implementations, such as Figure 6 As shown, the air conditioning system of the present invention further includes a second indoor heat exchanger 42. Along the airflow direction, the second indoor heat exchanger 42 is located downstream of the aforementioned first indoor heat exchanger 41. The second indoor heat exchanger 42 is used to connect to the piping of the air conditioning system, so that the air conditioning system also has a temperature-regulating and dehumidifying mode. In this temperature-regulating and dehumidifying mode, the first indoor heat exchanger 41 cools, and the second indoor heat exchanger 42 heats.

[0104] In the above example, when dehumidification is required during the transitional season, the first indoor heat exchanger 41 acts as a separate evaporator to cool and dehumidify the indoor air, while the second indoor heat exchanger 42 acts as a low-temperature condenser to reheat the cooled and dehumidified air, increasing the supply air temperature and improving indoor comfort. This solves the problem of low comfort and high energy consumption caused by excessively low outlet air temperature and evaporation temperature during dehumidification operation in humid regions during the transitional season. Furthermore, it also addresses the issue of conventional air conditioning systems requiring an additional reheat heat exchanger, which increases system complexity and cost.

[0105] In order to connect the second indoor heat exchanger 42 to the piping of the air conditioning system, in some embodiments, such as Figure 6 As shown, one end of the aforementioned second indoor heat exchanger 42 is connected to the liquid storage device 61, and the other end can be selectively connected to the suction port or exhaust port 13 of the compressor 10. The pipeline of the second indoor heat exchanger 42 can be opened or closed, and the pipeline between the second indoor heat exchanger 42 and the first indoor heat exchanger 41 also has a throttling device.

[0106] In this way, by connecting the second indoor heat exchanger 42 into the air conditioning system pipeline, the second indoor heat exchanger 42 can cooperate with the first indoor heat exchanger 41 to realize the temperature regulation and dehumidification functions of the air conditioning system. Furthermore, the second indoor heat exchanger 42 can also assist in cooling or heating in other modes of the air conditioning system.

[0107] In a specific application example, such as Figure 6As shown, in the temperature and humidity control mode, the pipes of the first outdoor heat exchanger 32, the first indoor heat exchanger 41, and the second indoor heat exchanger 42 are all open, and the other end of the first indoor heat exchanger 41 is connected to the air intake of the compressor 10. The other ends of the first outdoor heat exchanger 32 and the second indoor heat exchanger 42 are both connected to the exhaust port 13 of the compressor. The pipes of the water tank heat exchanger 83 are open or closed, and the other end of the water tank heat exchanger 83 is connected to the exhaust port 13 of the compressor when the pipes of the water tank heat exchanger 83 are open.

[0108] In the above example, through the connection method of the above temperature and dehumidification mode, the first indoor heat exchanger 41 is cooled, and the first outdoor heat exchanger 32 and the second outdoor heat exchanger 31 are heated in the temperature and dehumidification mode, thereby realizing the temperature and dehumidification function of the air conditioning system in the temperature and dehumidification mode.

[0109] It should be noted here that the piping of water tank heat exchanger 83 can be opened or closed in temperature and dehumidification mode, such as... Figure 7 As shown, when the piping of the water tank heat exchanger 83 is opened in the temperature and humidity control mode, the water tank heat exchanger 83 can operate in heating mode to heat the water in the water tank 84, thus enabling the air conditioning system to simultaneously produce hot water in the temperature and humidity control mode. For example, Figure 6 As shown, when the pipeline of the water tank heat exchanger 83 is closed in the temperature and humidity control mode, the water tank heat exchanger 83 does not work, so that the air conditioning system only has the temperature and humidity control function in the temperature and humidity control mode.

[0110] The aforementioned second indoor heat exchanger 42 is also used for auxiliary cooling or heating, specifically, such as Figure 1-2 As shown, in cooling mode and cooling / hot water mode, the pipes of the second indoor heat exchanger 42 are opened, and the other end of the second indoor heat exchanger 42 is connected to the suction port of the compressor 10, so that the second indoor heat exchanger 42 can assist in cooling. Figure 4 As shown, in heating mode, the piping of the second indoor heat exchanger 42 is opened, and the other end of the second indoor heat exchanger 42 is connected to the compressor's exhaust port 13, so that the second indoor heat exchanger 42 can assist in heating. Figure 3 and Figure 5 As shown, in hot water production mode and heating and hot water production mode, the pipes of the second indoor heat exchanger 42 are closed so that the second indoor heat exchanger 42 does not work, reducing the amount of refrigerant used in the system, which is beneficial to improving the heating capacity of the water tank heat exchanger 83 and the first indoor heat exchanger 41.

[0111] To enable the piping of the aforementioned second indoor heat exchanger 42 to be opened or closed, in some embodiments, such as Figure 1As shown, when a throttling device, specifically a third throttling valve 52, is installed on the pipeline of the first indoor heat exchanger 41, and this third throttling valve 52 is located on the side of the first indoor heat exchanger 41 closest to the liquid storage device 61, and is used to control the opening or closing of the pipeline of the first indoor heat exchanger 41, one end of the second indoor heat exchanger 42 is connected to the liquid storage device 61 through the third throttling valve 52. Furthermore, a fourth throttling valve 54 is also installed on the pipeline between the second indoor heat exchanger 42 and the third throttling valve 52. This fourth throttling valve 54 serves as a throttling device on the pipeline between the second indoor heat exchanger 42 and the first indoor heat exchanger 41; and the third throttling valve 52 and the fourth throttling valve 54 work together to control the opening or closing of the pipeline of the second indoor heat exchanger 42.

[0112] Specifically, in cooling mode, cooling and hot water mode, and heating mode, both the third throttle valve 52 and the fourth throttle valve 54 are open to open the pipes of the second indoor heat exchanger 42; in hot water mode, the third throttle valve 52 is closed to close the pipes of the second indoor heat exchanger 42; in temperature control and dehumidification mode, the fourth throttle valve 54 is open to open the pipes of the second indoor heat exchanger 42; and in heating and hot water mode, the fourth throttle valve 54 is closed to close the pipes of the second indoor heat exchanger 42.

[0113] It should be noted here that: (as...) Figure 1 As shown, when the air conditioning system of the present invention is in cooling mode, both the aforementioned first indoor heat exchanger 41 and the second indoor heat exchanger 42 are cooling. The third throttling valve 52 and the fourth throttling valve 54 work together to split the refrigerant flowing out of the third throttling valve 52 into two streams. One stream flows into the first indoor heat exchanger 41, and the other stream first passes through the fourth throttling valve 54 to reduce its pressure before flowing into the second indoor heat exchanger 42. This makes the second indoor heat exchanger 42 have a lower evaporation temperature than the first indoor heat exchanger 41. The airflow flows through the two indoor heat exchangers with high and low evaporation temperatures in sequence, thereby achieving stepped cooling and dehumidification of the return air, reducing irreversible losses in the heat exchange process, and improving the cooling energy efficiency ratio and the dehumidification capacity per unit energy consumption.

[0114] In some implementations, such as Figure 9 As shown, the air conditioning system of the present invention also has a heat storage defrosting mode. In the heat storage defrosting mode, the first outdoor heat exchanger 32 heats and the water tank heat exchanger 83 cools.

[0115] In the example above, the air conditioning system in heat storage defrosting mode can achieve winter heat storage defrosting by using the heat stored in the water tank 84 during daily hot water production, which shortens the defrosting cycle and reduces the fluctuation of indoor ambient temperature during heating operation.

[0116] To achieve the heat storage defrosting mode function of the aforementioned air conditioning system, in some implementations, such as... Figure 9 As shown, in the heat storage defrosting mode, the pipes of the first indoor heat exchanger 41 are open, and the pipes of both the water tank heat exchanger 83 and the first outdoor heat exchanger 32 are open. The other end of the water tank heat exchanger 83 is connected to the suction port of the compressor 10, and the other end of the first outdoor heat exchanger 32 is connected to the discharge port 13 of the compressor. When the air conditioning system also includes a second indoor heat exchanger 42, in the heat storage defrosting mode, the pipes of the second indoor heat exchanger 42 are closed.

[0117] In the above example, through the connection method of the above-mentioned heat storage defrosting mode, the first outdoor heat exchanger 32 heats, the first indoor heat exchanger 41 cools, the second indoor heat exchanger 42 does not work, and the water tank heat exchanger 83 cools, thereby realizing the heat storage defrosting function of the air conditioning system in the heat storage defrosting mode.

[0118] In some implementations, such as Figure 1 As shown, the aforementioned compressor 10 has a first compression section and a second compression section, and the exhaust gases from both the first and second compression sections are combined and discharged through the compressor's exhaust port 13. The first compression section has a first intake port 11, and the second compression section has a second intake port 12. The intake ports of the aforementioned compressor 10 include the first intake port 11 and the second intake port 12. The compressor 10 simultaneously draws air through the first intake port 11 and the second intake port 12 in different modes of the air conditioning system.

[0119] In the example above, by having the compressor 10 have two compression sections that compress simultaneously, the compression efficiency can be improved.

[0120] In order to enable the other end of each of the aforementioned water tank heat exchanger 83, the first outdoor heat exchanger 32 and the first indoor heat exchanger 41 to be selectively connected to the air intake or exhaust port 13 of the compressor 10, in some embodiments, the air conditioning system of the present invention further includes a first four-way reversing valve 22, a second four-way reversing valve 21 and a one-way valve 55. The compressor's exhaust port 13 is connected to both the D pipe of the first four-way reversing valve 22 and the D pipe of the second four-way reversing valve 21. The S pipe of the first four-way reversing valve 22 is connected to the second suction port 12, and the S pipe of the first four-way reversing valve 22 is connected to the inlet of the one-way valve 55. The outlet of the one-way valve 55 is connected to the C pipe of the second four-way reversing valve 21. The E pipe of the first four-way reversing valve 22 is connected to the other end of the first indoor heat exchanger 41, and the C pipe of the first four-way reversing valve 22 is connected to the other end of the first outdoor heat exchanger 32. The E pipe of the second four-way reversing valve 21 is connected to the other end of the water tank heat exchanger 83, and the S pipe of the second four-way reversing valve 21 is connected to the first suction port 11.

[0121] In some embodiments, when the air conditioning system further includes a second indoor heat exchanger 42, and one end of the second indoor heat exchanger 42 is connected to the liquid storage device 61, and the other end is selectively connected to the suction port or exhaust port 13 of the compressor 10, the other end of the second indoor heat exchanger 42 is connected to the E pipe of the second four-way reversing valve 21, so that the second four-way reversing valve 21 can be selectively connected to the suction port or exhaust port 13 of the compressor 10.

[0122] In the above example, by controlling whether the first four-way reversing valve 22 and the second four-way reversing valve 21 are energized or de-energized, the other end of each of the four heat exchangers 83, the first outdoor heat exchanger 32, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 can be selectively connected to the suction port or the exhaust port 13 of the compressor 10.

[0123] In some implementations, such as Figure 1 As shown, in cooling mode, the E pipe of the first four-way reversing valve 22 is connected to the S pipe of the first four-way reversing valve 22, and the D pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22; the D pipe of the second four-way reversing valve 21 is connected to the C pipe of the second four-way reversing valve 21, and the E pipe of the second four-way reversing valve 21 is connected to the S pipe of the second four-way reversing valve 21; so that the other end of the first outdoor heat exchanger 32, the water tank heat exchanger 83 and the second indoor heat exchanger 42 are all connected to the exhaust port 13 of the compressor, and the other end of the first indoor heat exchanger 41 is connected to the suction port of the compressor 10.

[0124] In some implementations, such as Figure 2 As shown, in cooling and hot water production modes, the E pipe of the first four-way reversing valve 22 is connected to the S pipe of the first four-way reversing valve 22, and the D pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22; the D pipe of the second four-way reversing valve 21 is connected to the E pipe of the second four-way reversing valve 21, and the C pipe of the second four-way reversing valve 21 is connected to the S pipe of the second four-way reversing valve 21; so that the other ends of the first outdoor heat exchanger 32, the water tank heat exchanger 83 and the second indoor heat exchanger 42 are all connected to the exhaust port 13 of the compressor, and the other end of the first indoor heat exchanger 41 is connected to the suction port of the compressor 10.

[0125] In some implementations, such as Figure 3As shown, in hot water production mode, the E pipe of the first four-way reversing valve 22 is connected to the D pipe of the first four-way reversing valve 22, and the S pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22; the D pipe of the second four-way reversing valve 21 is connected to the E pipe of the second four-way reversing valve 21, and the C pipe of the second four-way reversing valve 21 is connected to the S pipe of the second four-way reversing valve 21; so that the other ends of the first indoor heat exchanger 41, the water tank heat exchanger 83 and the second indoor heat exchanger 42 are all connected to the exhaust port 13 of the compressor, and the other end of the first outdoor heat exchanger 32 is connected to the suction port of the compressor 10.

[0126] In some implementations, such as Figure 4 As shown, in heating mode, the E pipe of the first four-way reversing valve 22 is connected to the D pipe of the first four-way reversing valve 22, and the S pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22; the D pipe of the second four-way reversing valve 21 is connected to the E pipe of the second four-way reversing valve 21, and the C pipe of the second four-way reversing valve 21 is connected to the S pipe of the second four-way reversing valve 21; so that the other ends of the first indoor heat exchanger 41, the water tank heat exchanger 83 and the second indoor heat exchanger 42 are all connected to the exhaust port 13 of the compressor, and the other end of the first outdoor heat exchanger 32 is connected to the suction port of the compressor 10.

[0127] In some implementations, such as Figure 5 As shown, in heating and hot water production modes, the E pipe of the first four-way reversing valve 22 is connected to the D pipe of the first four-way reversing valve 22, and the S pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22; the D pipe of the second four-way reversing valve 21 is connected to the E pipe of the second four-way reversing valve 21, and the C pipe of the second four-way reversing valve 21 is connected to the S pipe of the second four-way reversing valve 21; so that the other ends of the first indoor heat exchanger 41, the water tank heat exchanger 83 and the second indoor heat exchanger 42 are all connected to the exhaust port 13 of the compressor, and the other end of the first outdoor heat exchanger 32 is connected to the suction port of the compressor 10.

[0128] In some implementations, such as Figure 6 and Figure 7 As shown, when the air conditioning system includes a temperature and dehumidification mode, in the temperature and dehumidification mode, the E pipe of the first four-way reversing valve 22 is connected to the S pipe of the first four-way reversing valve 22, and the D pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22; the D pipe of the second four-way reversing valve 21 is connected to the E pipe of the second four-way reversing valve 21, and the C pipe of the second four-way reversing valve 21 is connected to the S pipe of the second four-way reversing valve 21; so that the other ends of the first outdoor heat exchanger 32, the water tank heat exchanger 83 and the second indoor heat exchanger 42 are all connected to the exhaust port 13 of the compressor, and the other end of the first indoor heat exchanger 41 is connected to the suction port of the compressor 10.

[0129] In some implementations, such as Figure 9 As shown, when the air conditioning system includes a heat storage defrosting mode, in the heat storage defrosting mode, the E pipe of the first four-way reversing valve 22 is connected to the S pipe of the first four-way reversing valve 22, and the D pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22; the D pipe of the second four-way reversing valve 21 is connected to the C pipe of the second four-way reversing valve 21, and the E pipe of the second four-way reversing valve 21 is connected to the S pipe of the second four-way reversing valve 21; so that the other ends of the first outdoor heat exchanger 32, the water tank heat exchanger 83 and the second indoor heat exchanger 42 are all connected to the exhaust port 13 of the compressor, and the other end of the first indoor heat exchanger 41 is connected to the suction port of the compressor 10.

[0130] In some implementations, such as Figure 10 As shown, the aforementioned compressor 10 also has a third compression section, and the exhaust gas from the third compression section is also discharged through the compressor's exhaust port 13. The third compression section has a third suction port, which is connected to the liquid storage device 61.

[0131] In the above example, the first compression section, the second compression section and the third compression section cooperate to form a three-cylinder parallel compressor 10. The compressor 10 has three suction ports, namely the first suction port 11, the second suction port 12 and the third suction port, thereby forming a parallel compression cycle. This can reduce the dryness of the evaporator inlet, improve the system energy efficiency and greatly improve the heating capacity of the system.

[0132] In some implementations, such as Figure 10 As shown, the aforementioned air conditioning system also includes a second outdoor heat exchanger 31, which operates in the same state as the first outdoor heat exchanger 32, i.e., both simultaneously maintain heating, cooling, or no operation. At least one of the first outdoor heat exchanger 32 and the second outdoor heat exchanger 31 is located within the exhaust duct 72.

[0133] In the example above, the outdoor heat exchanger located in the exhaust duct 72 forms a regenerator, which can recover part of the cold or heat of the indoor exhaust air and improve the system energy efficiency.

[0134] In some embodiments, the aforementioned first indoor heat exchanger 41 is located within the fresh air duct 74, allowing fresh air to exchange heat with the first indoor heat exchanger 41, thereby reducing the impact of fresh air on indoor temperature and improving comfort. When the air conditioning system includes a second indoor heat exchanger 42, the second indoor heat exchanger 42 is also located within the fresh air duct 74.

[0135] In some implementations, such as Figure 10As shown, when a throttling device, specifically a second throttling valve 51, is installed on the pipeline of the first outdoor heat exchanger 32, the first outdoor heat exchanger 32 is connected to the second throttling valve 51 to form a first branch, and the second outdoor heat exchanger 32 is connected to the fifth throttling valve 56 to form a second branch. The first and second branches are connected in parallel. The simultaneous opening or closing of both the second throttling valve 51 and the third throttling valve 52 ensures that the operating states of the second outdoor heat exchanger 31 and the first outdoor heat exchanger 32 remain consistent.

[0136] When at least one of the first outdoor heat exchanger 32 and the second outdoor heat exchanger 31 is located in the exhaust duct 72, and the fresh air duct 74 and the exhaust duct 72 exchange heat between fresh air and exhaust air through a total heat exchanger, the exhaust air can exchange heat with the fresh air and the regenerator in sequence. This can fully recover the latent heat and sensible heat of the indoor exhaust air and further improve the system energy efficiency.

[0137] In some embodiments, the heat exchanger located in the exhaust duct 72 between the first outdoor heat exchanger 32 and the second outdoor heat exchanger 31 is taken as the regenerator, and the regenerator is located downstream of the total heat exchanger along the exhaust direction of the exhaust duct 72.

[0138] In some implementations, along the air intake direction of the fresh air duct 74, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 may both be located downstream of the total heat exchanger.

[0139] In some implementations, such as Figure 10 As shown, to aid in heat dissipation, a first fan 94 is also provided at the aforementioned first outdoor heat exchanger 32. A second fan 91 is provided in the aforementioned exhaust duct 72, which drives the airflow within the exhaust duct 72 to accelerate exhaust.

[0140] The aforementioned first throttle valve 53, second throttle valve 51, third throttle valve 52, fourth throttle valve 54, and fifth throttle valve 56 can all be electronic expansion valves. When the air conditioning system of this invention operates in temperature and dehumidification mode, adjusting the opening degree of each electronic expansion valve can achieve the distribution of refrigerant flow between the first outdoor heat exchanger 32 and the second indoor heat exchanger 42. Combined with the adjustment of the compressor 10 frequency and the respective speeds of the first fan 94 and the fresh air fan 92, it can achieve the adjustment of indoor dehumidification capacity and outlet air temperature, as well as energy-saving optimization, and the control of return air temperature and humidity.

[0141] The air conditioning system of this invention can use environmentally friendly and efficient refrigerants such as R32 and R290.

[0142] In some implementations, such as Figure 11As shown, when the throttling device includes a third throttling valve 52, and the third throttling valve 52 is installed on the pipeline between the first indoor heat exchanger 41 and the liquid storage device 61, the third throttling valve 52 and the first indoor heat exchanger 41 are connected to form a third branch. There can be two or more third branches, connected in parallel sequentially. Each first indoor heat exchanger 41 within the third branch is installed in a different room to form a multi-split mode of the air conditioning system, enabling heating or cooling of different rooms.

[0143] In some implementations, such as Figure 11 As shown, when the air conditioning system also includes a second indoor heat exchanger 42, and a fourth throttling valve 54 is installed on the pipeline between the second indoor heat exchanger 42 and the third throttling valve 52, the fourth throttling valve 54 and the second indoor heat exchanger 42 are connected to form a fifth branch. The number of fifth branches is equal to the number of third branches, and each fifth branch is arranged in parallel sequentially. Furthermore, each second indoor heat exchanger 42 in the fifth branch corresponds one-to-one with each first indoor heat exchanger 41 in the third branch, so that temperature and humidity can be adjusted in each different room.

[0144] In some implementations, such as Figure 11 As shown, the aforementioned fresh air duct 74 includes a fresh air branch section 75 located downstream of the total heat exchanger 73. Each different room is provided with this fresh air branch section 75, and the first indoor heat exchanger 41 of each different room is installed in the corresponding fresh air branch section 75, so that fresh air can be diverted into each different room.

[0145] In the example above, fresh air enters the fresh air duct 74 through a fresh air inlet and exchanges heat with indoor exhaust in the total heat exchanger 73. The fresh air is then distributed into different rooms, while the indoor exhaust is discharged in a centralized manner.

[0146] In some implementations, such as Figure 11 As shown, a purification device 71 can be installed at the fresh air inlet of the aforementioned fresh air duct 74 to purify the fresh air.

[0147] The present invention also provides a control method for any of the above-mentioned air conditioning systems. When the air conditioning system simultaneously includes a first four-way reversing valve 22, a second four-way reversing valve 21, a first throttle valve 53, a second throttle valve 51, a third throttle valve 52, a fourth throttle valve 54, and a one-way valve 55, the control method includes:

[0148] Step S1: Obtain the operating mode of the air conditioning system.

[0149] Step S2: Based on the obtained operating mode, control the first four-way reversing valve 22 and the second four-way reversing valve 21 to be energized or de-energized respectively, and control the opening and closing of the first throttle valve 53, the second throttle valve 51, the third throttle valve 52 and the fourth throttle valve 54 respectively.

[0150] It should be noted that: when the first four-way directional valve 22 is de-energized, its D-tube and C-tube are connected, and its E-tube and S-tube are connected. When the first four-way directional valve 22 is energized, its D-tube and E-tube are connected, and its S-tube and C-tube are connected. When the second four-way directional valve 21 is de-energized, its D-tube and C-tube are connected, and its E-tube and S-tube are connected. When the second four-way directional valve 21 is energized, the D tube of the second four-way directional valve 21 is connected to the E tube of the second four-way directional valve 21, and the S tube of the second four-way directional valve 21 is connected to the C tube of the second four-way directional valve 21.

[0151] The aforementioned throttling valves, in conjunction with the liquid storage device 61, can regulate the distribution of refrigerant flow, thereby achieving the distribution of condensing load and the regulation of indoor air outlet temperature. This significantly improves comfort, reduces energy consumption, and makes the system relatively simple and low-cost.

[0152] The aforementioned air conditioning system also includes a fresh air fan 92 that draws air into the room, and the fresh air fan 92 draws air into the room through a fresh air duct 74. The aforementioned control method further includes: when the air conditioning system is in heating mode, controlling the fresh air fan 92 to only turn on when the surface temperature of the first indoor heat exchanger 41 is greater than or equal to a set value, in order to reduce the impact of fresh air on the indoor temperature.

[0153] In some implementations, when the air conditioning system is in heating and hot water production mode, or in temperature-regulating and dehumidifying mode with the pipes of the water tank heat exchanger 83 open, if the water temperature in the water tank 84 is lower than a first preset value and / or the surface temperature of the first indoor heat exchanger 41 is lower than a second preset value, the fresh air fan 92 is controlled to stop operating. This not only prevents cold air but also allows the water in the water tank 84 to heat up rapidly. If either the water temperature in the water tank 84 is greater than or equal to the first preset value or the surface temperature of the first indoor heat exchanger 41 is greater than or equal to the second preset value, the fresh air fan 92 is controlled to run at a low speed to ensure the system exhaust saturation temperature and heating supply air temperature. If the water temperature in the water tank 84 is greater than or equal to the first preset value and the surface temperature of the first indoor heat exchanger 41 is greater than or equal to the second preset value, the fresh air fan 92 is controlled to run at a high speed to improve system performance.

[0154] In some implementations, when the air conditioning system has a heat storage defrosting mode and the air conditioning system is running in the heat storage defrosting mode, the fresh air fan 92 is controlled to stop operating in order to reduce the impact on the defrosting of the outdoor heat exchanger.

[0155] In some implementations, when the air conditioning system is operating in the cooling mode for conventional defrosting, the fresh air fan 92 is controlled to stop operating to reduce the impact on the defrosting of the outdoor heat exchanger.

[0156] In some implementations, when the air conditioning system has a heat storage defrosting mode and defrosting of the outdoor heat exchanger is required, the water temperature in the water tank 84 is first detected. If the water temperature in the water tank 84 is lower than a preset temperature, the air conditioning system is controlled to operate in cooling mode for conventional defrosting. If the water temperature in the water tank 84 is greater than or equal to the preset temperature, the air conditioning system is controlled to operate in heat storage defrosting mode. Specifically, when the air conditioning system is operating in heat storage defrosting mode, if the water temperature in the water tank 84 is lower than the preset temperature, the air conditioning system is switched to cooling mode for conventional defrosting.

[0157] In the example above, if the water temperature in water tank 84 is too low, it means that the heat in water tank 84 is insufficient to supply the outdoor heat exchanger for defrosting. In this case, only the conventional defrosting mode can be used.

[0158] For ease of understanding, the overall structure of the present invention will be described below, and its working principle will be explained.

[0159] like Figure 1 As shown, when the air conditioning system of the present invention is running in cooling mode, both the first four-way reversing valve 22 and the second four-way reversing valve 21 are de-energized, the first throttle valve 53 is closed, and the water tank heat exchanger 83 is not working. The D-tube and C-tube of the first four-way reversing valve 22 are connected, as are the S-tube and E-tube. The D-tube and C-tube of the second four-way reversing valve 21 are connected, as are the S-tube and E-tube. The high-temperature, high-pressure refrigerant gas discharged from compressor 10 enters the first outdoor heat exchanger 32 and the second outdoor heat exchanger 31 through the D and C pipes of the first four-way reversing valve 22. In the first and second outdoor heat exchangers 32 and 31, it releases heat and condenses into high-pressure liquid refrigerant. Then, after being throttled and depressurized by the second throttle valve 51, it enters the liquid storage device 61. The liquid-phase saturated refrigerant separated from the liquid storage device 61 is throttled and depressurized by the third throttle valve 52 and then splits into two paths: one path evaporates and absorbs heat in the first indoor heat exchanger 41, and then enters the second suction port 12 of compressor 10 through the E and S pipes of the first four-way reversing valve 22 (although the D and C pipes of the second four-way reversing valve 21 are connected at this time, the presence of the one-way valve 55 prevents the high-temperature, high-pressure exhaust gas from compressor 10 from directly mixing with the suction gas of compressor 10). Figure 1(As shown by the dashed line); another refrigerant enters the second indoor heat exchanger 42 after being further throttled and depressurized by the fourth throttle valve 54. After heat exchange, it enters the first suction port 11 of the compressor 10 through the E pipe and S pipe of the second four-way reversing valve 21. The refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section and then discharged mixed with exhaust gas, thus completing the entire refrigeration cycle.

[0160] In this cooling mode, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 serve as a high-temperature evaporator and a low-temperature evaporator, respectively. The high-temperature evaporator is mainly responsible for the sensible heat load, while the low-temperature evaporator is mainly responsible for the latent heat load. The evaporation process involves cascade heat exchange, which reduces the heat exchange temperature difference, reduces irreversible losses in the heat exchange process, and improves system energy efficiency.

[0161] like Figure 2 As shown, in the cooling and hot water production modes of the air conditioning system of the present invention, the first four-way reversing valve 22 is de-energized, the second four-way reversing valve 21 is energized, the first throttle valve 53 is open, and the second throttle valve 51 is closed. At this time, the water tank heat exchanger 83 is working. The D-pipe and C-pipe of the first four-way reversing valve 22 are connected, the S-pipe and E-pipe of the first four-way reversing valve 22 are connected, the D-pipe and E-pipe of the second four-way reversing valve 21 are connected, and the S-pipe and C-pipe of the second four-way reversing valve 21 are connected. The high-temperature, high-pressure refrigerant gas discharged from the compressor 10 enters the water tank heat exchanger 83 to exchange heat with the water in the water tank 84. In the water tank heat exchanger 83, it releases heat and condenses into a high-pressure, subcooled liquid refrigerant. This liquid then passes through the first throttling valve 53, where its pressure is reduced, and enters the liquid storage device 61. The liquid saturated refrigerant separated from the liquid storage device 61 passes through the third throttling valve 52, where its pressure is further reduced, and enters the first indoor heat exchanger 41. After heat exchange in the first indoor heat exchanger 41, the refrigerant enters the second suction port 12 of the compressor 10 through the E-tube and S-tube of the first four-way reversing valve 22, respectively. The refrigerant exiting the S-tube of the first four-way reversing valve 22 also passes through the C-tube and S-tube of the second four-way reversing valve 21, entering the first suction port 11 of the compressor 10. The refrigerant in the first suction port 11 and the second suction port 12 is compressed in their respective compression sections and then discharged mixed with the exhaust gas, thus completing the entire refrigerant cycle. On the water circulation side, the water in the water tank 84 exchanges heat with the high-temperature and high-pressure refrigerant discharged by the compressor 10. The water is heated to the target temperature and then flows out from the outlet 82 of the water tank 84 to the user end for use. The inlet 81 of the water tank 84 is connected to the water pipeline network, so that the water in the water tank 84 is kept at a certain water level.

[0162] In this cooling and hot water production mode, the water tank heat exchanger 83 is equivalent to a condenser. Since both the second throttle valve 51 and the fifth throttle valve are closed, neither the first outdoor heat exchanger 32 nor the second outdoor heat exchanger 31 works. The hot water produced can meet the domestic water demand, which is energy-saving and environmentally friendly.

[0163] like Figure 3 As shown, when the air conditioning system of the present invention is operating in hot water mode, both the first four-way reversing valve 22 and the second four-way reversing valve 21 are energized, while the third throttle valve 52 and the fourth throttle valve 54 are closed. The D-pipe and E-pipe of the first four-way reversing valve 22 are connected, as are the C-pipe and S-pipe of the first four-way reversing valve 22. The D-pipe and E-pipe of the second four-way reversing valve 21 are connected, as are the C-pipe and S-pipe of the second four-way reversing valve 21. The high-temperature, high-pressure gaseous refrigerant discharged from compressor 10 enters the water tank heat exchanger 83 through pipes D and E of the second four-way reversing valve 21. In water tank 84, the high-temperature, high-pressure refrigerant releases heat and becomes a high-pressure subcooled liquid. It then passes through the first throttling valve 53, where its pressure is reduced, and enters the liquid storage device 61. The saturated liquid refrigerant from the liquid storage tank passes through the second throttling valve 51, where its pressure is reduced, and enters the first outdoor heat exchanger 32, where it evaporates and absorbs heat to become gaseous. It then passes through the fifth throttling valve, where its pressure is reduced, and enters the second outdoor heat exchanger 31, where it evaporates and absorbs heat to become gaseous again. The gaseous refrigerant passes through pipes C and S of the first four-way reversing valve 22, and then splits into two paths: one path directly enters the second suction port 12 of compressor 10, and the other path sequentially passes through the one-way valve 55, pipes C and S of the second four-way reversing valve 21, and enters the first suction port 11 of compressor 10. After the refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section, it is discharged mixed with the exhaust gas, thus completing the entire hot water production cycle. On the water circulation side, the water in the water tank 84 exchanges heat with the high-temperature and high-pressure refrigerant discharged from the compressor 10, and the water is heated to the target temperature. Then, it flows out from the outlet 82 of the water tank 84 and is sent to the user end for use. The inlet 81 of the water tank 84 is connected to the water pipe network, so that the water in the water tank 84 is maintained at a certain water level.

[0164] like Figure 4As shown, when the air conditioning system of the present invention is running in heating mode, both the first four-way reversing valve 22 and the second four-way reversing valve 21 are energized, the first throttle valve 53 is closed, and the water tank heat exchanger 83 is not working. The D-pipe and E-pipe of the first four-way reversing valve 22 are connected, as are the C-pipe and S-pipe of the first four-way reversing valve 22. The D-pipe and E-pipe of the second four-way reversing valve 21 are connected, as are the C-pipe and S-pipe of the second four-way reversing valve 21. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 10 is divided into two paths. One path enters the first indoor heat exchanger 41 through the D and E pipes of the first four-way reversing valve 22, where it condenses and releases heat to become liquid. The other path enters the second indoor heat exchanger 42 through the D and E pipes of the second four-way reversing valve 21, where it condenses and releases heat to become liquid. Then, it is throttled and depressurized by the fourth throttle valve 54 (at this time, the fourth throttle valve 54 mainly plays the role of flow distribution) and mixes with the refrigerant from the first indoor heat exchanger 41. The mixed refrigerant is throttled and depressurized by the third throttle valve 52 and then enters the liquid storage device 61. The liquid-phase saturated refrigerant from the liquid storage device 61 is further throttled and depressurized by the second throttle valve 51 and then enters the first outdoor heat exchanger 32 to evaporate and absorb heat to become gaseous. The gaseous refrigerant passes through the C-tube and S-tube of the first four-way reversing valve 22, and then splits into two paths. One path directly enters the second suction port 12 of the compressor 10, while the other path sequentially passes through the one-way valve 55, the C-tube of the second four-way reversing valve 21, and the S-tube of the second four-way reversing valve 21 before entering the first suction port 11 of the compressor 10. After the refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section, the exhaust gases are mixed and discharged, thus completing the entire heating cycle.

[0165] like Figure 5As shown, in the heating and hot water production modes of the air conditioning system of the present invention, both the first four-way reversing valve 22 and the second four-way reversing valve 21 are energized. The D-pipe and E-pipe of the first four-way reversing valve 22 are connected, as are the C-pipe and S-pipe of the first four-way reversing valve 22. Similarly, the D-pipe and E-pipe of the second four-way reversing valve 21 are connected, as are the C-pipe and S-pipe of the second four-way reversing valve 21. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 10 is divided into three paths. The first path enters the first indoor heat exchanger 41 through the D and E pipes of the first four-way reversing valve 22, where it condenses and releases heat to become liquid. The second path enters the second indoor heat exchanger 42 through the D and E pipes of the second four-way reversing valve 21, where it condenses and releases heat to become liquid. Then, it is throttled and depressurized by the fourth throttle valve 54 (at this time, the fourth throttle valve 54 mainly plays the role of flow distribution) and mixes with the refrigerant from the first indoor heat exchanger 41. The mixed refrigerant is then throttled and depressurized by the third throttle valve 52 and enters the liquid storage device 61. The third path of refrigerant flows through the D and E pipes of the second four-way reversing valve 21, and exchanges heat with the water in the water tank 84 through the water tank heat exchanger 83, heating the water in the water tank 84. After the heat exchange is completed, it is throttled and depressurized by the first throttle valve 53 and then enters the liquid storage device 61. The liquid-phase saturated refrigerant from the storage device 61 is further throttled and depressurized by the second throttling valve 51 before entering the first outdoor heat exchanger 32 to evaporate and absorb heat into a gaseous state. The gaseous refrigerant passes through the C-tube and S-tube of the first four-way reversing valve 22, and then splits into two paths. One path directly enters the second suction port 12 of the compressor 10, and the other path sequentially passes through the one-way valve 55, the C-tube of the second four-way reversing valve 21, and the S-tube of the second four-way reversing valve 21 before entering the first suction port 11 of the compressor 10. After the refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section, the exhaust gas is mixed and discharged, thus completing the entire heating + hot water production cycle.

[0166] like Figure 6As shown, when the air conditioning system of the present invention operates in the temperature regulation and dehumidification mode with the pipeline of the water tank heat exchanger 83 closed, the first four-way reversing valve 22 is de-energized, the second four-way reversing valve 21 is energized, and the first throttle valve 53 is closed. The D pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22, the E pipe of the first four-way reversing valve 22 is connected to the S pipe of the first four-way reversing valve 22, the D pipe of the second four-way reversing valve 21 is connected to the E pipe of the second four-way reversing valve 21, and the S pipe of the second four-way reversing valve 21 is connected to the C pipe of the second four-way reversing valve 21. The high-temperature, high-pressure gaseous refrigerant discharged from compressor 10 is divided into two paths. One path enters the first outdoor heat exchanger 32 through pipes D and C of the first four-way reversing valve 22 for heat exchange, condenses and releases heat to become liquid refrigerant, and then enters the liquid storage device 61 after being throttled and depressurized by the second throttle valve 51. The liquid-phase saturated refrigerant from the liquid storage device 61 is further throttled and depressurized by the third throttle valve 52. The other path of refrigerant discharged from compressor 10 enters the second indoor heat exchanger 42 through pipes D and E of the second four-way reversing valve 21 for heat exchange, condenses and releases heat to become liquid refrigerant, and then enters the second indoor heat exchanger 42 after being throttled and depressurized by the fourth throttle valve 54. Finally, it mixes with the refrigerant from the third throttle valve 52. The mixed refrigerant enters the first indoor heat exchanger 41, evaporates and absorbs heat to become gaseous. The gaseous refrigerant passes through the E and S-tubes of the first four-way reversing valve 22, and then splits into two paths. One path is directly drawn into the second suction port 12 of the compressor 10, while the other path passes sequentially through the one-way valve 55, the C and S-tubes of the second four-way reversing valve 21, and then enters the first suction port 11 of the compressor 10. After the refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section, the exhaust gases are mixed and then discharged, thus completing the entire temperature control and dehumidification cycle.

[0167] In the temperature-regulating and dehumidifying mode with the pipeline of the water tank heat exchanger 83 closed, dehumidification of the air is achieved without cooling by switching the valve. The first indoor heat exchanger 41 acts as a separate evaporator to cool and dehumidify the indoor air, while the second indoor heat exchanger 42 acts as a low-temperature condenser to reheat the cooled and dehumidified air, thereby increasing the supply air temperature and improving the comfort of the indoor environment.

[0168] like Figure 7As shown, when the air conditioning system of the present invention is running in temperature-regulating and dehumidifying mode with the water tank heat exchanger 83 pipe open, the first four-way reversing valve 22 is de-energized, the second four-way reversing valve 21 is energized, and the first throttle valve 53 is open. The D pipe of the first four-way reversing valve 22 is connected to the C pipe of the first four-way reversing valve 22, the E pipe of the first four-way reversing valve 22 is connected to the S pipe of the first four-way reversing valve 22, the D pipe of the second four-way reversing valve 21 is connected to the E pipe of the second four-way reversing valve 21, and the S pipe of the second four-way reversing valve 21 is connected to the C pipe of the second four-way reversing valve 21. The high-temperature, high-pressure gaseous refrigerant discharged from compressor 10 is divided into three paths. The first path enters the first outdoor heat exchanger 32 through pipes D and C of the first four-way reversing valve 22 for heat exchange, condenses and releases heat to become liquid refrigerant, and then enters the liquid storage device 61 after being throttled and depressurized by the second throttling valve 51. The second path of refrigerant from the compressor 10 discharge port 13 passes through pipes D and E of the second four-way reversing valve 21, completes heat exchange in the water tank heat exchanger 83, and then passes through the first throttling valve 53. The refrigerant is further throttled and depressurized, and then enters the liquid storage device 61. The liquid-phase saturated refrigerant from the liquid storage device 61 is further throttled and depressurized through the third throttle valve 52. The third refrigerant enters the second indoor heat exchanger 42 through the D and E pipes of the second four-way reversing valve 21 for heat exchange, condenses and releases heat to become liquid refrigerant, and then is throttled and depressurized through the fourth throttle valve 54. Finally, it mixes with the refrigerant from the third throttle valve 52, and the mixed refrigerant enters the first indoor heat exchanger 41, evaporates and absorbs heat to become gaseous. This gaseous refrigerant passes through the E pipe and S pipe of the first four-way reversing valve 22, and then splits into two paths. One path is directly sucked into the second suction port 12 of the compressor 10, and the other path passes through the one-way valve 55, the C pipe of the second four-way reversing valve 21, and the S pipe of the second four-way reversing valve 21 in sequence to enter the first suction port 11 of the compressor 10. After the refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section, the exhaust mixture is discharged, thus completing the entire temperature control, dehumidification and hot water production cycle.

[0169] like Figure 8As shown, the air conditioning system of the present invention operates in the same way as the cooling mode during normal defrosting mode. At this time, both the first four-way reversing valve 22 and the second four-way reversing valve 21 are de-energized, the first throttle valve 53 is closed, and the water tank heat exchanger 83 is not working. The D-pipe and C-pipe of the first four-way reversing valve 22 are connected, as are the S-pipe and E-pipe of the first four-way reversing valve 22. The D-pipe and C-pipe of the second four-way reversing valve 21 are connected, as are the S-pipe and E-pipe of the second four-way reversing valve 21. The high-temperature, high-pressure refrigerant gas discharged from compressor 10 enters the first outdoor heat exchanger 32 and the second outdoor heat exchanger 31 through the D and C pipes of the first four-way reversing valve 22. In the first and second outdoor heat exchangers 32 and 31, it releases heat and condenses into high-pressure liquid refrigerant. Then, after being throttled and depressurized by the second throttle valve 51, it enters the liquid storage device 61. The liquid-phase saturated refrigerant separated from the liquid storage tank is throttled and depressurized by the third throttle valve 52 and then splits into two paths: one path evaporates and absorbs heat in the first indoor heat exchanger 41, and then enters the second suction port 12 of compressor 10 through the E and S pipes of the first four-way reversing valve 22 (although the D and C ends of the second four-way reversing valve 21 are connected at this time, the presence of the one-way valve 55 prevents the high-temperature, high-pressure exhaust gas from compressor 10 from directly mixing with the suction gas of compressor 10). Figure 8 (As shown by the dashed line); another refrigerant enters the second indoor heat exchanger 42 after being further throttled and depressurized by the fourth throttle valve 54. After heat exchange, it enters the first suction port 11 of the compressor 10 through the E pipe and S pipe of the second four-way reversing valve 21. The refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section and then discharged mixed with exhaust gas, thus completing the entire conventional defrosting cycle.

[0170] In this normal defrosting mode, the fresh air fan 92 does not turn. By monitoring the water temperature of the water tank heat exchanger 83, if it is lower than the set temperature, it can be determined that defrosting cannot be performed through the water tank heat exchanger 83, and normal defrosting is activated.

[0171] like Figure 9As shown, when the air conditioning system of the present invention is operating in the heat storage defrosting mode, both the first four-way reversing valve 22 and the second four-way reversing valve 21 are de-energized, and the first throttle valve 53 is closed. The D-pipe of the first four-way reversing valve 22 is connected to the C-pipe of the first four-way reversing valve 22, and the E-pipe of the first four-way reversing valve 22 is connected to the S-pipe of the first four-way reversing valve 22. The D-pipe of the second four-way reversing valve 21 is connected to the C-pipe of the second four-way reversing valve 21, and the E-pipe of the second four-way reversing valve 21 is connected to the S-pipe of the second four-way reversing valve 21. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 10 enters the first outdoor heat exchanger 32 and the second outdoor heat exchanger 31 through the D and C pipes of the first four-way reversing valve 22 for heat exchange. It condenses and releases heat to become liquid refrigerant. Then, it enters the liquid storage device 61 after being throttled and depressurized by the second throttle valve 51. The liquid-phase saturated refrigerant in the liquid storage device 61 is divided into two paths. One path is throttled and depressurized by the third throttle valve 52 and enters the first indoor heat exchanger 41. Then, it enters the second suction port 12 of the compressor 10 through the E and S pipes of the first four-way reversing valve 22. The other path of refrigerant from the liquid storage tank is throttled and depressurized by the first throttle valve 53 and enters the water tank heat exchanger 83 to absorb heat. After heat exchange, it enters the first suction port 11 of the compressor 10 through the E and S pipes of the second four-way reversing valve 21. After the refrigerant entering the first suction port 11 and the second suction port 12 of the compressor 10 is compressed in its respective compression section, the exhaust mixture is discharged, thus completing the entire heat storage defrosting mode cycle.

[0172] In this heat storage defrosting mode, the fresh air fan 92 does not turn when the power is off. The system mainly absorbs heat from the water tank heat exchanger 83 to complete the heat storage defrosting process. Compared with the traditional defrosting process, the defrosting process is faster and more stable due to the presence of the water tank heat exchanger 83, shortening the defrosting cycle. The system has high energy efficiency by utilizing the heat stored in the water tank 84.

[0173] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0174] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: It includes a compressor (10), a liquid storage device (61), a first outdoor heat exchanger (32), a first indoor heat exchanger (41), and a water tank heat exchanger (83); One end of each of the water tank heat exchanger (83), the first outdoor heat exchanger (32) and the first indoor heat exchanger (41) is connected to the liquid storage device (61), and the other end of each of them can be selectively connected to the suction port or exhaust port (13) of the compressor (10). The pipelines of each of them can be opened or closed, and the pipelines between each pair of the three have throttling devices so that the air conditioning system has a cooling mode, a heating mode, a hot water mode, a cooling and hot water mode and a heating and hot water mode. The liquid storage device (61) is capable of adjusting the amount of refrigerant circulating in the air conditioning system under different modes of the air conditioning system. The air conditioning system also includes a total heat exchanger (73), a fresh air duct (74), and an exhaust air duct (72), wherein the fresh air duct (74) and the exhaust air duct (72) exchange heat and moisture between the fresh air and the exhaust air through the total heat exchanger (73); The water tank heat exchanger (83) is provided with a throttling device on its pipeline. The throttling device is a first throttling valve (53), which is located on the side of the water tank heat exchanger (83) near the liquid storage device (61). The first throttling valve (53) is used to control the opening or closing of the pipeline of the water tank heat exchanger (83). The first outdoor heat exchanger (32) is provided with a throttling device on its pipeline. The throttling device is a second throttling valve (51), which is located on the first outdoor heat exchanger. (32) is located on the side of the liquid storage device (61), and the second throttle valve (51) is used to control the opening or closing of the pipeline of the first outdoor heat exchanger (32); the throttle device is provided on the pipeline of the first indoor heat exchanger (41), and the throttle device is a third throttle valve (52). The third throttle valve (52) is located on the side of the first indoor heat exchanger (41) near the liquid storage device (61), and the third throttle valve (52) is used to control the opening or closing of the pipeline of the first indoor heat exchanger (41); The compressor (10) has a first compression section and a second compression section, and the exhaust from both the first compression section and the second compression section is combined and discharged through the exhaust port (13) of the compressor; the first compression section has a first intake port (11), and the second compression section has a second intake port (12), and the intake port of the compressor (10) includes the first intake port (11) and the second intake port (12); wherein, the compressor (10) simultaneously draws air through the first intake port (11) and the second intake port (12) in different modes of the air conditioning system; The air conditioning system further includes a first four-way reversing valve (22), a second four-way reversing valve (21), and a one-way valve (55); wherein, the exhaust port (13) of the compressor is connected to the D-pipe of the first four-way reversing valve (22) and the D-pipe of the second four-way reversing valve (21), the S-pipe of the first four-way reversing valve (22) is connected to the second intake port (12), and the S-pipe of the first four-way reversing valve (22) is connected to the inlet of the one-way valve (55), and the one-way valve ( The outlet of 55) is connected to the C pipe of the second four-way reversing valve (21), the E pipe of the first four-way reversing valve (22) is connected to the other end of the first indoor heat exchanger (41), the C pipe of the first four-way reversing valve (22) is connected to the other end of the first outdoor heat exchanger (32); the E pipe of the second four-way reversing valve (21) is connected to the other end of the water tank heat exchanger (83), and the S pipe of the second four-way reversing valve (21) is connected to the first air intake (11).

2. The air conditioning system according to claim 1, characterized in that: The liquid storage device (61) includes a liquid storage tank. The liquid storage device (61) is connected to one end of each of the water tank heat exchanger (83), the first outdoor heat exchanger (32), and the first indoor heat exchanger (41) through the liquid storage tank. The liquid storage device (61) adjusts the amount of refrigerant circulating in the air conditioning system in different modes of the air conditioning system through the liquid storage tank.

3. The air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system further includes a second indoor heat exchanger (42); along the airflow direction, the second indoor heat exchanger (42) is located downstream of the first indoor heat exchanger (41); wherein the second indoor heat exchanger (42) is used to connect to the pipes of the air conditioning system so that the air conditioning system also has a temperature regulation and dehumidification mode; in the temperature regulation and dehumidification mode, the first indoor heat exchanger (41) cools and the second indoor heat exchanger (42) heats.

4. The air conditioning system according to claim 3, characterized in that: One end of the second indoor heat exchanger (42) is connected to the liquid storage device (61), and the other end is optionally connected to the suction port or exhaust port (13) of the compressor (10). The pipeline of the second indoor heat exchanger (42) can be opened or closed, and the pipeline between the second indoor heat exchanger (42) and the first indoor heat exchanger (41) also has a throttling device.

5. The air conditioning system according to claim 4, characterized in that: In the temperature and humidity control mode, the pipes of the first outdoor heat exchanger (32), the first indoor heat exchanger (41) and the second indoor heat exchanger (42) are all open, and the other end of the first indoor heat exchanger (41) is connected to the air intake of the compressor (10). The other ends of the first outdoor heat exchanger (32) and the second indoor heat exchanger (42) are both connected to the exhaust port (13) of the compressor. The pipes of the water tank heat exchanger (83) are open or closed, and the other end of the water tank heat exchanger (83) is connected to the exhaust port (13) of the compressor when the pipes of the water tank heat exchanger (83) are open. And / or, in the cooling mode and the cooling and hot water mode, the pipe of the second indoor heat exchanger (42) is open, and the other end of the second indoor heat exchanger (42) is connected to the suction port of the compressor (10); in the heating mode, the pipe of the second indoor heat exchanger (42) is open, and the other end of the second indoor heat exchanger (42) is connected to the exhaust port (13) of the compressor; in the hot water mode and the heating and hot water mode, the pipe of the second indoor heat exchanger (42) is closed.

6. The air conditioning system according to claim 3, characterized in that: One end of the second indoor heat exchanger (42) is connected to the liquid storage device (61) through the third throttle valve (52), and a fourth throttle valve (54) is also provided on the pipeline between the second indoor heat exchanger (42) and the third throttle valve (52); wherein, the fourth throttle valve (54) serves as a throttling device on the pipeline between the second indoor heat exchanger (42) and the first indoor heat exchanger (41); the third throttle valve (52) and the fourth throttle valve (54) work together to control the opening or closing of the pipeline of the second indoor heat exchanger (42).

7. The air conditioning system according to any one of claims 1-2, characterized in that: The air conditioning system also has a heat storage defrosting mode, in which the first outdoor heat exchanger (32) heats and the water tank heat exchanger (83) cools.

8. The air conditioning system according to claim 7, characterized in that: The air conditioning system further includes a second indoor heat exchanger (42); along the airflow direction, the second indoor heat exchanger (42) is located downstream of the first indoor heat exchanger (41); wherein, the second indoor heat exchanger (42) is used to connect to the pipes of the air conditioning system so that the air conditioning system also has a temperature regulation and dehumidification mode; in the temperature regulation and dehumidification mode, the first indoor heat exchanger (41) cools and the second indoor heat exchanger (42) heats; In the heat storage defrosting mode, the pipe of the first indoor heat exchanger (41) is open, the pipe of the second indoor heat exchanger (42) is closed, the pipes of both the water tank heat exchanger (83) and the first outdoor heat exchanger (32) are open, and the other end of the water tank heat exchanger (83) is connected to the air intake of the compressor (10), and the other end of the first outdoor heat exchanger (32) is connected to the exhaust port (13) of the compressor.

9. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a second indoor heat exchanger (42); along the airflow direction, the second indoor heat exchanger (42) is located downstream of the first indoor heat exchanger (41); wherein, the second indoor heat exchanger (42) is used to connect to the pipes of the air conditioning system so that the air conditioning system also has a temperature regulation and dehumidification mode; in the temperature regulation and dehumidification mode, the first indoor heat exchanger (41) cools and the second indoor heat exchanger (42) heats; one end of the second indoor heat exchanger (42) is connected to the liquid storage device (61), and the other end is selectively connected to the suction port or exhaust port (13) of the compressor (10), and the pipes of the second indoor heat exchanger (42) can be opened or closed, and the pipes between the second indoor heat exchanger (42) and the first indoor heat exchanger (41) also have a throttling device; The other end of the second indoor heat exchanger (42) is connected to the E pipe of the second four-way reversing valve (21) so that it can be selectively connected to the suction port or the exhaust port (13) of the compressor (10) through the second four-way reversing valve (21).

10. The air conditioning system according to claim 9, characterized in that: In the cooling mode, the E pipe of the first four-way reversing valve (22) is connected to the S pipe of the first four-way reversing valve (22), and the D pipe of the first four-way reversing valve (22) is connected to the C pipe of the first four-way reversing valve (22); the D pipe of the second four-way reversing valve (21) is connected to the C pipe of the second four-way reversing valve (21), and the E pipe of the second four-way reversing valve (21) is connected to the S pipe of the second four-way reversing valve (21); And / or, in the cooling and hot water production mode, the E pipe of the first four-way reversing valve (22) is connected to the S pipe of the first four-way reversing valve (22), and the D pipe of the first four-way reversing valve (22) is connected to the C pipe of the first four-way reversing valve (22); the D pipe of the second four-way reversing valve (21) is connected to the E pipe of the second four-way reversing valve (21), and the C pipe of the second four-way reversing valve (21) is connected to the S pipe of the second four-way reversing valve (21); And / or, in the hot water production mode, the E pipe of the first four-way reversing valve (22) is connected to the D pipe of the first four-way reversing valve (22), and the S pipe of the first four-way reversing valve (22) is connected to the C pipe of the first four-way reversing valve (22); the D pipe of the second four-way reversing valve (21) is connected to the E pipe of the second four-way reversing valve (21), and the C pipe of the second four-way reversing valve (21) is connected to the S pipe of the second four-way reversing valve (21); And / or, in the heating mode, the E pipe of the first four-way reversing valve (22) is connected to the D pipe of the first four-way reversing valve (22), and the S pipe of the first four-way reversing valve (22) is connected to the C pipe of the first four-way reversing valve (22); the D pipe of the second four-way reversing valve (21) is connected to the E pipe of the second four-way reversing valve (21), and the C pipe of the second four-way reversing valve (21) is connected to the S pipe of the second four-way reversing valve (21); And / or, in the heating and hot water production modes, the E pipe of the first four-way reversing valve (22) is connected to the D pipe of the first four-way reversing valve (22), and the S pipe of the first four-way reversing valve (22) is connected to the C pipe of the first four-way reversing valve (22); the D pipe of the second four-way reversing valve (21) is connected to the E pipe of the second four-way reversing valve (21), and the C pipe of the second four-way reversing valve (21) is connected to the S pipe of the second four-way reversing valve (21); And / or, when the air conditioning system includes a temperature-regulating and dehumidifying mode, in the temperature-regulating and dehumidifying mode, the E pipe of the first four-way reversing valve (22) is connected to the S pipe of the first four-way reversing valve (22), and the D pipe of the first four-way reversing valve (22) is connected to the C pipe of the first four-way reversing valve (22); the D pipe of the second four-way reversing valve (21) is connected to the E pipe of the second four-way reversing valve (21), and the C pipe of the second four-way reversing valve (21) is connected to the S pipe of the second four-way reversing valve (21); And / or, when the air conditioning system includes a heat storage defrosting mode, in the heat storage defrosting mode, the E pipe of the first four-way reversing valve (22) is connected to the S pipe of the first four-way reversing valve (22), and the D pipe of the first four-way reversing valve (22) is connected to the C pipe of the first four-way reversing valve (22); the D pipe of the second four-way reversing valve (21) is connected to the C pipe of the second four-way reversing valve (21), and the E pipe of the second four-way reversing valve (21) is connected to the S pipe of the second four-way reversing valve (21).

11. The air conditioning system according to claim 1, characterized in that: The compressor (10) also has a third compression section, the exhaust of which is also discharged through the exhaust port (13) of the compressor. The third compression section has a third suction port, which is connected to the liquid storage device (61).

12. The air conditioning system according to any one of claims 1-2 and 9-11, characterized in that: The air conditioning system also includes a second outdoor heat exchanger (31), the second outdoor heat exchanger (31) and the first outdoor heat exchanger (32) are in the same working state; at least one of the first outdoor heat exchanger (32) and the second outdoor heat exchanger (31) is located in the exhaust duct (72); And / or, the first indoor heat exchanger (41) is located within the fresh air duct (74).

13. The air conditioning system according to claim 12, characterized in that: The air conditioning system further includes a second indoor heat exchanger (42); along the airflow direction, the second indoor heat exchanger (42) is located downstream of the first indoor heat exchanger (41); wherein, the second indoor heat exchanger (42) is used to connect to the pipes of the air conditioning system so that the air conditioning system also has a temperature regulation and dehumidification mode; in the temperature regulation and dehumidification mode, the first indoor heat exchanger (41) cools and the second indoor heat exchanger (42) heats; The first outdoor heat exchanger (32) is connected to the second throttle valve (51) to form a first branch, and the second outdoor heat exchanger (31) is connected to the fifth throttle valve (56) to form a second branch. The first branch and the second branch are connected in parallel.

14. The air conditioning system according to any one of claims 1-2 and 9-11, characterized in that: The third throttle valve (52) is installed on the pipeline between the first indoor heat exchanger (41) and the liquid storage device (61), and the third throttle valve (52) and the first indoor heat exchanger (41) are connected to form a third branch; The number of the third branch is two or more, and they are connected in parallel in sequence; wherein, each of the first indoor heat exchangers (41) in the third branch is used to be installed in different indoor rooms.

15. The air conditioning system according to claim 14, characterized in that: The air conditioning system further includes a second indoor heat exchanger (42); along the airflow direction, the second indoor heat exchanger (42) is located downstream of the first indoor heat exchanger (41); wherein, the second indoor heat exchanger (42) is used to connect to the pipes of the air conditioning system so that the air conditioning system also has a temperature regulation and dehumidification mode; in the temperature regulation and dehumidification mode, the first indoor heat exchanger (41) cools, and the second indoor heat exchanger (42) heats; one end of the second indoor heat exchanger (42) is connected to the pipes of the air conditioning system. The third throttle valve (52) is connected to the liquid storage device (61), and a fourth throttle valve (54) is also provided on the pipeline between the second indoor heat exchanger (42) and the third throttle valve (52); wherein, the fourth throttle valve (54) serves as a throttling device on the pipeline between the second indoor heat exchanger (42) and the first indoor heat exchanger (41); the third throttle valve (52) and the fourth throttle valve (54) work together to control the opening or closing of the pipeline of the second indoor heat exchanger (42); The fourth throttle valve (54) and the second indoor heat exchanger (42) are connected to form a fifth branch; The number of the fifth branches is equal to the number of the third branches, and each fifth branch is arranged in parallel in sequence. Each second indoor heat exchanger (42) in the fifth branch corresponds to each first indoor heat exchanger (41) in the third branch.

16. The air conditioning system according to claim 14, characterized in that: The fresh air duct (74) includes a fresh air branch section (75) located downstream of the total heat exchanger (73). Each different room is provided with the fresh air branch section (75), and the first indoor heat exchanger (41) of each different room is located in the corresponding fresh air branch section (75).

17. A control method for the air conditioning system of claim 6, characterized in that: The control method includes: Obtain the operating mode of the air conditioning system; According to the obtained operating mode, the first four-way reversing valve (22) and the second four-way reversing valve (21) are controlled to be powered on or off respectively, and the opening and closing of the first throttle valve (53), the second throttle valve (51), the third throttle valve (52) and the fourth throttle valve (54) are controlled respectively.

18. The control method according to claim 17, characterized in that: The air conditioning system has a fresh air fan (92) that draws air into the room, and the fresh air fan (92) draws air into the room through the fresh air duct (74); When the air conditioning system is in the heating mode, the fresh air fan (92) is turned on only when the surface temperature of the first indoor heat exchanger (41) is greater than or equal to the set value. And / or, when the air conditioning system is in heating and hot water production mode, or in temperature regulation and dehumidification mode with the pipes of the water tank heat exchanger (83) open, if the water temperature in the water tank (84) is lower than the first preset value and / or the surface temperature of the first indoor heat exchanger (41) is lower than the second preset value, the fresh air fan (92) is controlled to stop operating; if only one of the following conditions is met, namely, the water temperature in the water tank (84) is greater than or equal to the first preset value and the surface temperature of the first indoor heat exchanger (41) is greater than or equal to the second preset value, the fresh air fan (92) is controlled to run at low speed; if the water temperature in the water tank (84) is greater than or equal to the first preset value and the surface temperature of the first indoor heat exchanger (41) is greater than or equal to the second preset value, the fresh air fan (92) is controlled to run at high speed. And / or, when the air conditioning system has a heat storage defrosting mode, and the air conditioning system is running in the heat storage defrosting mode, the fresh air fan (92) is controlled to stop operating; And / or, when the air conditioning system is operating in the cooling mode for conventional defrosting, the fresh air fan (92) is controlled to stop operating.

19. The control method according to claim 17 or 18, characterized in that: When the air conditioning system has a heat storage defrosting mode and the outdoor heat exchanger needs to be defrosted, the water temperature in the water tank (84) is first detected. If the water temperature in the water tank (84) is lower than the preset temperature, the air conditioning system is controlled to run in cooling mode to perform conventional defrosting. If the water temperature in the water tank (84) is greater than or equal to the preset temperature, the air conditioning system is controlled to run in heat storage defrosting mode.

20. The control method according to claim 19, characterized in that: When the air conditioning system is running in the heat storage defrosting mode, if the water temperature in the water tank (84) is lower than the preset temperature, the air conditioning system will be switched to the cooling mode for conventional defrosting.

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