Fresh air system, air conditioner and working method thereof

Abstract

The application provides a fresh air system, an air conditioner and a working method thereof. The fresh air system comprises a fresh air inlet, a fresh air outlet, a humidity adjusting device, a dilute solution storage tank and a concentrated solution storage tank. The fresh air inlet is connected with an air inlet of the humidity adjusting device, the fresh air outlet is connected with an air outlet of the humidity adjusting device, the dilute solution storage tank is connected with a solution outlet of the humidity adjusting device, and a liquid outlet of the concentrated solution storage tank is connected with a solution inlet of the humidity adjusting device. The humidity adjusting device is provided with a water distributor, a first hollow fiber membrane contactor and a water absorption and air permeation material layer. The first hollow fiber membrane contactor is used for dehumidification, and the water distributor and the water absorption and air permeation material layer are used for humidification. The fresh air system further comprises a distillation device and a water storage tank. The distillation device recycles distilled water in a dehumidification process and is used for fresh air humidification of the humidity adjusting device. The fresh air system can effectively control the humidity of introduced fresh air and achieve energy saving and emission reduction.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically to a fresh air system, an air conditioner using the fresh air system, and a method for operating the air conditioner. Background Technology

[0002] Currently, fresh air conditioners have become the preferred choice for people to ensure a high quality of life. How to regulate the temperature and humidity of fresh air conditioners has become a key issue that needs to be addressed in the development of fresh air conditioners.

[0003] An existing air conditioning method based on membrane distillation technology for independent temperature and humidity control includes a lithium bromide absorption refrigeration system and a lithium bromide solution dehumidification system. The lithium bromide absorption refrigeration system controls the supply air temperature, and the lithium bromide solution dehumidification system controls the supply air humidity. The solution desorption process in the lithium bromide absorption refrigeration system and the solution regeneration process in the lithium bromide solution dehumidification system are centrally processed in a membrane distillation module. Utilizing the concentration and separation characteristics of the membrane distillation module for dilute lithium bromide solution, the concentrated lithium bromide solution is divided into two parts: one part is used as the absorption solution in the absorber, and the other part is used as the spray solution in the lithium bromide solution dehumidification system to dehumidify the air. Humidity control of the fresh / return air can be achieved by adjusting the spray concentration. The dilute lithium bromide solution absorbed in the absorber and the dilute lithium bromide solution in the dehumidification device are then concentrated and separated in the membrane distillation module. The water vapor separated by the membrane distillation module is condensed and depressurized, and then used to cool the chilled water in the evaporator to achieve temperature control of the fresh / return air. However, this method can only achieve dehumidification and cannot humidify fresh air. In addition, an additional heat source is required to heat the dilute solution during distillation, which leads to increased energy consumption.

[0004] Therefore, a more reasonable method for controlling the humidity of fresh air is needed. Summary of the Invention

[0005] The primary objective of this invention is to provide a fresh air system that can effectively control the humidity of the introduced fresh air while achieving energy conservation and emission reduction.

[0006] The second objective of this invention is to provide an air conditioner that can effectively control the humidity of the introduced fresh air while achieving energy conservation and emission reduction.

[0007] A third objective of this invention is to provide a method for operating an air conditioner that can effectively control the humidity level of the introduced fresh air.

[0008] To achieve the aforementioned first objective, the fresh air system provided by the present invention includes a fresh air inlet, a fresh air outlet, a humidity regulating device, a dilute solution storage tank, and a concentrated solution storage tank. The fresh air inlet is connected to the air inlet of the humidity regulating device, the fresh air outlet is connected to the air outlet of the humidity regulating device, the dilute solution storage tank is connected to the solution outlet of the humidity regulating device, and the outlet of the concentrated solution storage tank is connected to the solution inlet of the humidity regulating device. The humidity regulating device is provided with a shell, a water distributor, a first hollow fiber membrane contactor, and a water-absorbing and breathable material layer. The shell is provided with... The air duct, water distributor, hollow fiber membrane contactor, and water-absorbing and breathable material layer are all located inside the air duct, with the water outlet of the water distributor located above the water-absorbing and breathable material layer. The fresh air system also includes a distillation device and a water storage tank. The solution inlet of the distillation device is connected to the outlet of the dilute solution storage tank, and the solution outlet of the distillation device is connected to the inlet of the concentrated solution storage tank. The first water inlet of the water storage tank is connected to the bottom of the air duct, the first water outlet of the water storage tank is connected to the inlet of the water distributor, and the distilled water outlet of the distillation device is connected to the second water inlet of the water storage tank.

[0009] As can be seen from the above scheme, in the fresh air system of the present invention, the humidity regulating device, by setting up a water distributor, a first hollow fiber membrane contactor, and a water-absorbing and breathable material layer, can use the first hollow fiber membrane contactor for dehumidification and the water distributor and water-absorbing and breathable material layer for humidification, thereby reasonably controlling the humidity of the fresh air. In addition, the distillation device can also recover the distilled water from the dehumidification process and use it for fresh air humidification in the humidity regulating device, thereby realizing resource recycling.

[0010] In a further embodiment, the distillation apparatus is a solar membrane distillation apparatus; the solar membrane distillation apparatus includes a first membrane pool, a hydrophobic carbon-based permeable membrane capable of absorbing solar energy, and a second membrane pool, the first membrane pool and the second membrane pool being separated by the hydrophobic carbon-based permeable membrane, the solution inlet end and the solution outlet end being connected to the first membrane pool, and the distilled water outlet end being connected to the second membrane pool; both the first membrane pool and the second membrane pool are made of light-transmitting material.

[0011] Therefore, it is evident that setting up a solar membrane distillation device can regenerate the water absorption capacity of the humidity control system's absorbent solution, thereby achieving energy conservation and emission reduction. The solar membrane distillation device, by setting up a first membrane pool and a second membrane pool separated by a hydrophobic carbon-based breathable membrane, and by using light-transmitting materials for both membrane pools, can utilize solar energy to distill dilute absorbent solutions to obtain concentrated absorbent solutions, thus saving energy and reducing emissions.

[0012] In a further embodiment, the distillation apparatus is also equipped with a distilled water inlet, which is connected to the second outlet of the water storage tank.

[0013] Therefore, by connecting the distillation water inlet to the second outlet of the water storage tank, the distillation apparatus can easily introduce water from the water storage tank into the distillation apparatus to accelerate the cooling and condensation of water vapor.

[0014] In a further design, the water storage tank is also equipped with an air outlet, which is fitted with a vacuum pump.

[0015] Therefore, the vacuum pump installed at the air outlet of the water storage tank can facilitate the extraction of air from the water storage tank, reduce the air pressure on one side of the water storage tank, and allow water from the distillation device to enter the water storage tank.

[0016] In a further embodiment, a second hollow fiber membrane contactor is installed in the passage between the solution inlet of the distillation device and the outlet of the dilute solution storage tank. The second hollow fiber membrane contactor is used to install at the outdoor unit heat exchanger near the outdoor unit of the air conditioner.

[0017] Therefore, by setting up a second hollow fiber membrane contactor, the heat generated by the heat exchanger of the outdoor unit of the air conditioner can be used to heat the solution in the second hollow fiber membrane contactor during refrigeration and dehumidification, which is beneficial for the distillation of the solution in the distillation device.

[0018] In a further embodiment, the fresh air system also includes a filter device, which is installed between the fresh air inlet and the air inlet of the humidity control device.

[0019] Therefore, it can be seen that by installing a filter device between the fresh air inlet and the air inlet of the humidity control device, it is convenient to filter the fresh air.

[0020] In a further embodiment, the fresh air system also includes a heat exchanger, which is equipped with a first heat exchange duct and a second heat exchange duct, and the first heat exchange duct and the second heat exchange duct can be configured for heat exchange; the fresh air inlet and the air inlet of the humidity control device are connected through the first heat exchange duct.

[0021] Therefore, it can be seen that by setting up a heat exchanger, the temperature of the fresh air can be controlled.

[0022] In a further embodiment, the fresh air system also includes an indoor exhaust vent, which is connected to the air inlet of the second heat exchange duct.

[0023] Therefore, by connecting the indoor exhaust vent to the air inlet of the second heat exchange duct, the temperature of the fresh air can be adjusted using the indoor exhaust air, thereby saving energy.

[0024] In a further design, a water collection tank is installed at the bottom of the air duct, and the first water inlet of the water storage tank is connected to the water collection tank.

[0025] Therefore, by setting a water collection tank at the bottom of the air duct, water leaking from the absorbent and breathable material layer can be collected.

[0026] To achieve the second objective of the present invention, the present invention provides an air conditioner including an indoor unit and an outdoor unit, the indoor unit and the outdoor unit forming a heat exchange circuit, and the air conditioner also includes a fresh air system, which adopts the aforementioned fresh air system.

[0027] To achieve the third objective of this invention, the method of operating an air conditioner provided by this invention includes: turning on the fresh air function of the air conditioner; upon confirming that a dehumidification command has been received, obtaining the humidity difference between the indoor humidity and the fresh air humidity at the fresh air outlet, and controlling the flow rate of the concentrated solution in the first hollow fiber membrane contactor according to the range of the humidity difference.

[0028] As can be seen from the above scheme, when the air conditioner turns on the fresh air function and needs to dehumidify, the working method of the air conditioner of the present invention controls the flow rate of the concentrated solution in the first hollow fiber membrane contactor according to the range of the humidity difference between the indoor humidity and the fresh air humidity at the fresh air outlet, so as to reasonably control the air conditioner to dehumidify and effectively control the humidity of the fresh air.

[0029] In a further proposed scheme, the absolute value of the humidity difference is positively correlated with the flow rate of the concentrated solution.

[0030] Therefore, the larger the absolute value of the humidity difference, the greater the flow rate of the concentrated solution, thereby increasing the dehumidification speed.

[0031] In a further solution, after the air conditioner turns on the fresh air function, it also includes: when a humidification command is received, obtaining the humidity difference between the indoor humidity and the fresh air humidity at the fresh air outlet, and controlling the water flow rate of the water distributor according to the range of the humidity difference.

[0032] Therefore, when humidification is required, the water flow rate of the water distributor can be controlled according to the range of the humidity difference between the indoor humidity and the fresh air humidity at the fresh air outlet. This can reasonably control the humidity in the air duct of the humidity regulating device, thereby effectively controlling the humidity of the fresh air.

[0033] In a further proposed approach, the absolute value of the humidity difference is positively correlated with the water flow rate.

[0034] It can be seen that the larger the absolute value of the humidity difference, the greater the water flow velocity, which can improve the humidification efficiency. Attached Figure Description

[0035] Figure 1 This is a system schematic diagram of the first embodiment of the air conditioner of the present invention.

[0036] Figure 2 This is a schematic diagram of the humidity regulating device in the first embodiment of the air conditioner of the present invention.

[0037] Figure 3This is a schematic diagram of the structure of the first hollow fiber membrane contactor and the water-absorbing and breathable material layer combined in the first embodiment of the air conditioner of the present invention.

[0038] Figure 4 This is a schematic diagram of the heat exchanger in the first embodiment of the air conditioner of the present invention.

[0039] Figure 5 This is a system schematic diagram of the second embodiment of the air conditioner of the present invention.

[0040] Figure 6 This is a flowchart of an embodiment of the working method of the air conditioner of the present invention.

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0042] First embodiment of the air conditioner:

[0043] like Figure 1 As shown, in this embodiment, the air conditioner includes an indoor unit 1 and an outdoor unit 6, which form a heat exchange circuit.

[0044] The air conditioner also includes a fresh air system. In this embodiment, the fresh air system includes a humidity regulating device 2, a filter device 3, a heat exchanger 4, a first fan 5, a first fluid pump 8, a solar film distillation device 9, a first valve 10, a dilute solution storage tank 11, a second fluid pump 12, a water storage tank 13, a second valve 14, a third valve 15, a third fluid pump 16, a fourth fluid pump 17, a second fan 18, a concentrated solution storage tank 19, a fourth valve 20, a fifth fluid pump 21, a fifth valve 22, a sixth valve 23, a seventh valve 24, a fresh air inlet A, a fresh air outlet B, an indoor exhaust outlet C, and an outdoor exhaust outlet D.

[0045] The fresh air inlet A is connected to the air inlet 2-11 of the humidity control device 2, the fresh air outlet B is connected to the air outlet 2-12 of the humidity control device 2, the dilute solution storage tank 11 is connected to the solution outlet 2-14 of the humidity control device 2, and the outlet of the concentrated solution storage tank 19 is connected to the solution inlet 2-13 of the humidity control device 2. Both the dilute solution storage tank 11 and the concentrated solution storage tank 19 are used to store hygroscopic solutions. The concentration of the hygroscopic solution in the concentrated solution storage tank 19 is greater than the concentration of the hygroscopic solution in the dilute solution storage tank 11. The hygroscopic solution is a well-known hygroscopic solution to those skilled in the art, such as lithium bromide solution, which will not be described in detail here.

[0046] In this embodiment, the filter device 3 is installed between the fresh air inlet A and the air inlet 2-11 of the humidity regulating device 2. By installing the filter device 3 between the fresh air inlet A and the air inlet 2-11 of the humidity regulating device 2, it is convenient to filter the fresh air and remove impurities from the air.

[0047] See Figure 2 and Figure 3 The humidity regulating device 2 is provided with a housing 2-5, a water distributor 2-3, a first hollow fiber membrane contactor 2-1, and a water-absorbing and breathable material layer 2-2. The housing 2-5 is provided with an air duct. The water distributor 2-3, the first hollow fiber membrane contactor 2-1, and the water-absorbing and breathable material layer 2-2 are all located inside the air duct. The water outlet of the water distributor 2-3 is located above the water-absorbing and breathable material layer 2-2.

[0048] In this embodiment, see Figure 4 The heat exchanger 4 is equipped with a first heat exchange duct 41 and a second heat exchange duct 42, which are configured for heat exchange. The fresh air inlet A is connected to the air inlet 2-11 of the humidity regulating device 2 via the first heat exchange duct 41, and a first fan 5 is installed between the fresh air inlet A and the air inlet of the first heat exchange duct 41. The indoor exhaust outlet C is connected to the air inlet 421 of the second heat exchange duct 42, and the outdoor exhaust outlet D is connected to the air outlet 422 of the second heat exchange duct 42. Preferably, the heat exchanger 4 is a shell-and-shell heat exchanger. By installing the heat exchanger, the temperature of the fresh air can be controlled. Simultaneously, by connecting the indoor exhaust outlet C to the air inlet of the second heat exchange duct 42, the temperature of the fresh air can be adjusted using the indoor exhaust air, thereby saving energy.

[0049] The solution inlet of the solar membrane distillation device 9 is connected to the outlet of the dilute solution storage tank 11, and the solution outlet of the solar membrane distillation device 9 is connected to the inlet of the concentrated solution storage tank 19. The first water inlet of the water storage tank 13 is connected to the bottom of the air duct, the first water outlet of the water storage tank 13 is connected to the inlet of the water distributor 2-3, and the distilled water outlet of the solar membrane distillation device 9 is connected to the second water inlet of the water storage tank 13. In this embodiment, a water collection tank 2-4 is provided at the bottom of the air duct, and the first water inlet of the water storage tank 13 is connected to the water collection tank 2-4.

[0050] In this embodiment, the solar membrane distillation device 9 includes a first membrane tank 9-1, a hydrophobic carbon-based permeable membrane 9-2 capable of absorbing solar energy, and a second membrane tank 9-3. The first membrane tank 9-1 and the second membrane tank 9-3 are separated by the hydrophobic carbon-based permeable membrane 9-2. The solution inlet and solution outlet are both connected to the first membrane tank 9-1, and the distilled water outlet is connected to the second membrane tank 9-3. Both the first membrane tank 9-1 and the second membrane tank 9-3 are made of light-transmitting material. By setting the first membrane tank 9-1 and the second membrane tank 9-3 separated by the hydrophobic carbon-based permeable membrane 9-2, and by using light-transmitting material for both membrane tanks 9-1 and 9-3, the solar membrane distillation device 9 can utilize solar energy to distill dilute water-absorbing solutions to obtain concentrated water-absorbing solutions, thus achieving energy conservation and emission reduction.

[0051] In this embodiment, the solar membrane distillation device 9 is further provided with a distilled water inlet, which is connected to the second outlet of the water storage tank 13 via a second fluid pump 12. By connecting the distilled water inlet to the second outlet of the water storage tank 13, the solar membrane distillation device 9 can easily introduce water from the water storage tank 13 into the solar membrane distillation device 9 to accelerate water vapor cooling and condensation.

[0052] In addition, a second valve 14 is provided at the drain end of the water storage tank 13, which can be used to add water to the water storage tank 13 or to drain water from the water storage tank 13. The second valve 14 is used to control the opening or closing of the drain end.

[0053] In this embodiment, a second hollow fiber membrane contactor 7 is installed in the passage between the solution inlet of the solar membrane distillation device 9 and the outlet of the dilute solution storage tank 11. The second hollow fiber membrane contactor 7 is installed near the outdoor unit heat exchanger 6-1 of the air conditioner outdoor unit 6. By installing the second hollow fiber membrane contactor 7, the heat generated by the outdoor unit heat exchanger 6-1 of the air conditioner outdoor unit 6 can be used to heat the water-absorbing solution in the second hollow fiber membrane contactor 7 during cooling and dehumidification, thereby recovering the heat dissipation of the outdoor unit heat exchanger 6-1, increasing the temperature of the water-absorbing solution, and facilitating the distillation of the water-absorbing solution in the distillation device 9. The second hollow fiber membrane contactor 7 can also be replaced by other heat exchangers, such as ceramic membrane heat exchangers or copper tube heat exchangers.

[0054] In this embodiment of the air conditioner, when fresh air needs to be introduced for cooling and humidification, fresh air is first introduced into the system through the first fan 5, and indoor air is discharged by the second fan 18, flowing through the heat exchanger 4 to exchange heat with the introduced fresh air. At this time, the temperature of the fresh air is reduced. After being filtered by the filter device 3, the fresh air enters the humidity regulating device 2. At this time, in the humidity regulating device 2, water stored in the water tank 13 is pumped into the water distributor 2-3 by the fourth fluid pump 17, and is circulated and sprayed on the water-absorbing and breathable material layer 2-2. The speed of the fourth fluid pump 17 can be controlled according to the difference between the moisture content of the fresh air and the target indoor humidity, thereby regulating the spray volume of the water distributor 2-3. At this time, the first fluid pump 8, the first valve 10, the second fluid pump 12, and the fourth valve 20 are closed. When the fresh air passes through the water-absorbing and breathable material layer 2-2, because the temperature of the fresh air is high, the moisture in the water-absorbing and breathable material will evaporate when it blows through it, increasing the moisture content of the fresh air. Moisture not absorbed by the absorbent material is collected in the water collection tanks 2-4 and returned to the water storage tank 13 by the action of the third fluid pump 16. Fresh air with suitable humidity is blown into the room through the indoor unit 1 of the air conditioner. At this time, the cooling temperature can be adjusted to control the humidity and temperature to meet the set requirements.

[0055] In this embodiment, when the air conditioner needs to introduce fresh air for cooling and dehumidification, fresh air is first introduced into the system through the first fan 5, while indoor air is discharged by the second fan 18. As the indoor air flows through the heat exchanger 4, it exchanges heat with the introduced fresh air, resulting in a slight decrease in temperature and the potential formation of some condensation. The fresh air then enters the humidity control device 2 after being filtered by the filter device 3. At this time, the third fluid pump 16 and the fourth fluid pump 17 are closed, the third valve 15 and the fifth valve 22 are closed, and the first valve 10 and the fourth valve 20 are opened. Simultaneously, the first fluid pump 8, the second fluid pump 12, and the fifth fluid pump 21 are opened. The fifth fluid pump 21 pumps the concentrated solution stored in the concentrated solution storage tank 19 into the hollow fiber membrane in the first hollow fiber membrane contactor 2-1. At this time, the high-humidity fresh air is blown into the humidity control device 2, where some water is absorbed by the dry, absorbent material. After passing through the first hollow fiber membrane contactor 2-1, some water vapor is carried away by the concentrated solution in the fiber membrane, and finally, the air enters the indoor unit 1 for cooling. The concentrated water-absorbing solution in the hydrophobic hollow fiber membrane filaments of the first hollow fiber membrane contactor 2-1 absorbs moisture from the fresh air, becoming a dilute water-absorbing solution, which then enters the dilute solution storage tank 11. The dilute water-absorbing solution flows through the second hollow fiber membrane contactor 7, absorbing heat from the outdoor unit heat exchanger 6-1 of the air conditioner outdoor unit 6, thus increasing its temperature, and then enters the solar membrane distillation device 9. The dilute water-absorbing solution entering the first membrane tank 9-1 experiences a further temperature increase under the influence of solar energy, causing water vapor to escape from the solution and diffuse near the surface of the hydrophobic carbon-based permeable membrane 9-2 into the second membrane tank 9-3. At this time, the second fluid pump 12 opens, and the fourth valve 20 closes. Under the action of the second fluid pump 12, water in the water storage tank 13 circulates on the second membrane tank 9-3 side, carrying away the water vapor diffused from the hydrophobic carbon-based permeable membrane 9-2 and returning it to the water storage tank 13. Meanwhile, the dilute solution in the first membrane tank 9-1 is regenerated into a concentrated water-absorbing solution that can continue to absorb moisture, and stored in the concentrated solution storage tank 19, and then pumped into the humidity controller for dehumidification.

[0056] In this embodiment, when the air conditioner is heating and requires humidification of the introduced fresh air, firstly, fresh air is introduced into the system through the first fan 5, while indoor air is discharged through the second fan 18, flowing through the heat exchanger 4 to exchange heat with the introduced fresh air, thus raising the temperature of the fresh air. After being filtered by the filter device 3, the fresh air enters the humidity regulating device 2. At this time, the fourth fluid pump 17 pumps water stored in the water tank 13 into the water distributor 2-3, which is then circulated and sprayed onto the absorbent and breathable material layer 2-2. The speed of pump 17 can be controlled according to the difference between the moisture content of the fresh air and the target indoor humidity, thereby regulating the spray volume of the water distributor. Unlike cooling, the first fluid pump 8, the first valve 10, the fourth valve 20, and the fifth fluid pump 21 do not need to be closed. In this case, the concentrated solution in the dilute solution storage tank 11 and the concentrated solution storage tank 19 can be replaced with water for circulation. The fresh air can be further humidified through a similar dehumidification path. Furthermore, the circulating water that absorbs solar energy not only further humidifies the fresh air, but also heats the condenser as it flows through the second hollow fiber membrane contactor 7, preventing frost formation. As the fresh air passes through the water-absorbing and breathable material layer 2-2, its temperature rises due to its lower temperature, increasing its moisture content. Fresh air with suitable moisture content is then blown into the room through the indoor unit 1 of the air conditioner. At this point, the heating temperature can be adjusted to control humidity and temperature to meet the set requirements.

[0057] In this embodiment, when the air conditioner is heating, and it is necessary to introduce fresh air for heating and dehumidification, fresh air is first introduced into the system through the first fan 5, and indoor air is discharged by the second fan 18, flowing through the heat exchanger 4 to exchange heat with the introduced fresh air. At this time, the temperature of the fresh air increases. After being filtered by the filter device 3, the fresh air enters the humidity regulating device 2. At this time, the third fluid pump 16 and the fourth fluid pump 17 are closed, the third valve 15 and the fifth valve 22 are closed, the first valve 10 and the fourth valve 20 are opened, and the first fluid pump 8 and the fifth fluid pump 21 are opened simultaneously. The fifth fluid pump 21 pumps the water-absorbing concentrated solution stored in the concentrated solution storage tank 19 into the first hollow fiber membrane contactor 2-1. At this time, the high-humidity fresh air is blown into the humidity regulating device 2, and some water is absorbed by the dry water-absorbing and breathable material layer 2-2. After passing through the first hollow fiber membrane contactor 2-1, some water vapor is carried away by the concentrated solution, and finally enters the indoor unit for heating. The concentrated absorbent solution in the hydrophobic hollow fiber membrane filaments of the first hollow fiber membrane contactor 2-1 absorbs moisture from the fresh air and becomes a dilute absorbent solution, which enters the dilute solution storage tank 11. The dilute absorbent solution flows through the second hollow fiber membrane contactor 7 and enters the solar membrane distillation device 9. After absorbing solar energy, the temperature of the dilute absorbent solution on the first membrane pool 9-1 side further increases, and water vapor escapes from the solution, diffuses near the surface of the hydrophobic carbon-based breathable membrane 9-2, and enters the second membrane pool 9-3. At this time, the second fluid pump 12 is turned on, and the fourth valve 20 is closed. Under the action of the second fluid pump 12, the water in the water storage tank 13 circulates on the second membrane pool 9-3 side, carrying away the water vapor diffused from the hydrophobic carbon-based breathable membrane 9-2 and returning it to the water storage tank 13. At the same time, the dilute absorbent solution in the first membrane pool 9-1 is regenerated into a concentrated absorbent solution that can continue to absorb moisture and is stored in the concentrated solution storage tank 19, and then pumped into the humidity controller for dehumidification.

[0058] As can be seen from the above scheme, in the fresh air system of the present invention, the humidity regulating device 2, by setting up a water distributor 2-3, a first hollow fiber membrane contactor 2-1, and a water-absorbing and breathable material layer 2-2, can use the first hollow fiber membrane contactor 2-1 for dehumidification and the water distributor 2-3 and the water-absorbing and breathable material layer 2-2 for humidification, thereby reasonably controlling the humidity of the fresh air. Simultaneously, the solar membrane distillation device 9 is set up to regenerate the water absorption capacity of the humidity control system's absorbent water solution, achieving energy conservation and emission reduction. Furthermore, the solar membrane distillation device 9 can also recover the distilled water from the dehumidification process for use in the fresh air humidification of the humidity regulating device 2, thereby achieving resource recycling.

[0059] Second embodiment of the air conditioner:

[0060] The air conditioner in this embodiment differs from the first embodiment only in the connection method between the water storage tank 13 and the solar membrane distillation device 9. The following description focuses on the differences, and the reference numerals are the same as those in the first embodiment.

[0061] See Figure 5 In this embodiment, the water storage tank 13 is also provided with an air outlet, and a vacuum pump 25 is installed at the air outlet. The vacuum pump 25 at the air outlet of the water storage tank 13 facilitates the extraction of air from the water storage tank 13, reduces the air pressure on one side of the water storage tank 13, and allows the water vapor from the solar membrane distillation device 9 to enter the water storage tank 13 and be condensed.

[0062] Example of how an air conditioner works:

[0063] In this embodiment, the working method of the air conditioner is the same as that of the air conditioner in the above embodiment.

[0064] See Figure 6 When the air conditioner is in operation, step S1 is executed first, which activates the fresh air function. Fresh air input can be controlled via remote control or automatically detected and activated by the air conditioner.

[0065] After turning on the fresh air function, proceed to step S2 to determine whether a dehumidification command has been received. The dehumidification command can be sent via the remote control or obtained through the air conditioner's detection.

[0066] When a dehumidification command is received, step S3 is executed to obtain the humidity difference between the indoor humidity and the fresh air humidity at fresh air outlet B. The flow rate of the concentrated solution in the first hollow fiber membrane contactor 2-1 is controlled based on the range of this humidity difference. By controlling the flow rate of the concentrated solution in the first hollow fiber membrane contactor 2-1 according to the range of the humidity difference between the indoor humidity and the fresh air humidity at fresh air outlet B, the dehumidification function of the air conditioner can be reasonably controlled, effectively controlling the humidity of the fresh air.

[0067] In this embodiment, the absolute value of the humidity difference is positively correlated with the flow rate of the concentrated solution. The larger the absolute value of the humidity difference, the greater the flow rate of the concentrated solution, thereby increasing the dehumidification speed. The flow rate of the concentrated solution can be controlled by the rotational speeds of the first fluid pump 8 and the fifth fluid pump 21.

[0068] In this embodiment, when the absolute value of the humidity difference is greater than or equal to the first humidity threshold, the rotation speed of the first fluid pump 8 and the fifth fluid pump 21 is the first preset rotation speed. When the absolute value of the humidity difference is greater than or equal to the second humidity threshold and less than the first humidity threshold, the rotation speed of the first fluid pump 8 and the fifth fluid pump 21 is the second preset rotation speed. When the absolute value of the humidity difference is greater than or equal to the third humidity threshold and less than the second humidity threshold, the rotation speed of the first fluid pump 8 and the fifth fluid pump 21 is the third preset rotation speed. The first preset rotation speed, the second preset rotation speed, and the third preset rotation speed can be preset according to experimental data.

[0069] If no dehumidification command is received during step S2, then step S4 is executed to determine whether a humidification command has been received. The dehumidification command can be sent via remote control or detected by the air conditioner.

[0070] If a humidification command is received, step S5 is executed to obtain the humidity difference between the indoor humidity and the fresh air humidity at fresh air outlet B. The water flow rate of water distributors 2-3 is controlled according to the range of this humidity difference. When humidification is required, the water flow rate of water distributors 2-3 is controlled according to the range of the humidity difference between the indoor humidity and the fresh air humidity at fresh air outlet B. This allows for reasonable control of the humidity within the duct of the humidity regulating device 2, thereby effectively controlling the humidity of the fresh air.

[0071] In this embodiment, the absolute value of the humidity difference is positively correlated with the water flow rate. The larger the absolute value of the humidity difference, the greater the water flow rate, thereby improving the humidification efficiency. The water flow rate can be controlled by the rotational speeds of the third fluid pump 16 and the fourth fluid pump 17.

[0072] In this embodiment, when the absolute value of the humidity difference is greater than or equal to the fourth humidity threshold, the rotation speed of the third fluid pump 16 and the fourth fluid pump 17 is the fourth preset rotation speed. When the absolute value of the humidity difference is greater than or equal to the fifth humidity threshold and less than the fourth humidity threshold, the rotation speed of the third fluid pump 16 and the fourth fluid pump 17 is the fourth preset rotation speed. When the humidity difference is greater than or equal to the sixth humidity threshold and less than the fifth humidity threshold, the rotation speed of the third fluid pump 16 and the fourth fluid pump 17 is the sixth preset rotation speed. The fourth preset rotation speed, the fifth preset rotation speed, the sixth humidity threshold, the fourth preset rotation speed, the fifth preset rotation speed, and the sixth preset rotation speed can be preset based on experimental data.

[0073] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. A fresh air system, comprising a fresh air inlet, a fresh air outlet, a humidity control device, a dilute solution storage tank, and a concentrated solution storage tank, wherein the fresh air inlet is connected to the air inlet of the humidity control device, the fresh air outlet is connected to the air outlet of the humidity control device, the dilute solution storage tank is connected to the solution outlet of the humidity control device, and the outlet of the concentrated solution storage tank is connected to the solution inlet of the humidity control device; characterized in that, The humidity regulating device is provided with a shell, a water distributor, a first hollow fiber membrane contactor, and a water-absorbing and breathable material layer. The shell is provided with an air duct. The water distributor, the first hollow fiber membrane contactor, and the water-absorbing and breathable material layer are all located in the air duct. The water outlet of the water distributor is located above the water-absorbing and breathable material layer. The fresh air system also includes a distillation device and a water storage tank. The solution inlet of the distillation device is connected to the outlet of the dilute solution storage tank, and the solution outlet of the distillation device is connected to the inlet of the concentrated solution storage tank. The first water inlet of the water storage tank is connected to the bottom of the air duct, the first water outlet of the water storage tank is connected to the water inlet of the water distributor, and the distilled water outlet of the distillation device is connected to the second water inlet of the water storage tank.

2. The fresh air system according to claim 1, characterized in that: The distillation apparatus is a solar membrane distillation apparatus; The solar membrane distillation device includes a first membrane tank, a hydrophobic carbon-based permeable membrane that can absorb solar energy, and a second membrane tank. The first membrane tank and the second membrane tank are separated by the hydrophobic carbon-based permeable membrane. The solution inlet and the solution outlet are connected to the first membrane tank, and the distilled water outlet is connected to the second membrane tank. Both the first membrane pool and the second membrane pool are made of light-transmitting material.

3. The fresh air system according to claim 2, characterized in that: The distillation apparatus is also provided with a distilled water inlet, which is connected to the second outlet of the water storage tank.

4. The fresh air system according to claim 1, characterized in that: The water storage tank is also equipped with an air outlet, and a vacuum pump is installed at the air outlet.

5. The fresh air system according to claim 1, characterized in that: A second hollow fiber membrane contactor is provided in the passage between the solution inlet of the distillation device and the outlet of the dilute solution storage tank. The second hollow fiber membrane contactor is used to install at the outdoor unit heat exchanger near the outdoor unit of the air conditioner.

6. The fresh air system according to any one of claims 1 to 5, characterized in that: The fresh air system also includes a filter device, which is installed between the fresh air inlet and the air inlet of the humidity control device.

7. The fresh air system according to any one of claims 1 to 5, characterized in that: The fresh air system also includes a heat exchanger, which is provided with a first heat exchange air duct and a second heat exchange air duct, and the first heat exchange air duct and the second heat exchange air duct are heat exchanged. The fresh air inlet and the air inlet of the humidity regulating device are connected through the first heat exchange duct.

8. The fresh air system according to claim 7, characterized in that: The fresh air system also includes an indoor exhaust vent, which is connected to the air inlet of the second heat exchange duct.

9. The fresh air system according to any one of claims 1 to 5, characterized in that: A water collection tank is provided at the bottom of the air duct, and the first water inlet of the water storage tank is connected to the water collection tank.

10. An air conditioner, comprising an indoor unit and an outdoor unit, wherein the indoor unit and the outdoor unit form a heat exchange circuit, characterized in that: The air conditioner also includes a fresh air system, wherein the fresh air system is the fresh air system described in any one of claims 1 to 9.

11. A method of operating an air conditioner, applied to an air conditioner, wherein the air conditioner is equipped with a fresh air system, the fresh air system comprising a fresh air inlet, a fresh air outlet, a humidity regulating device, a dilute solution storage tank, and a concentrated solution storage tank, wherein the fresh air inlet is connected to the air inlet of the humidity regulating device, the fresh air outlet is connected to the air outlet of the humidity regulating device, the dilute solution storage tank is connected to the solution outlet of the humidity regulating device, and the outlet of the concentrated solution storage tank is connected to the solution inlet of the humidity regulating device; characterized in that: The humidity regulating device is provided with a shell, a water distributor, a first hollow fiber membrane contactor, and a water-absorbing and breathable material layer. The shell is provided with an air duct. The water distributor, the hollow fiber membrane contactor, and the water-absorbing and breathable material layer are all located in the air duct. The water outlet of the water distributor is located above the water-absorbing and breathable material layer. The fresh air system also includes a distillation device and a water storage tank. The solution inlet of the distillation device is connected to the outlet of the dilute solution storage tank, and the solution outlet of the distillation device is connected to the inlet of the concentrated solution storage tank. The first water inlet of the water storage tank is connected to the bottom of the air duct, the first water outlet of the water storage tank is connected to the water inlet of the water distributor, and the distilled water outlet of the distillation device is connected to the second water inlet of the water storage tank. The method includes: The air conditioner is activated with its fresh air function. Upon receiving a dehumidification command, the system obtains the humidity difference between the indoor humidity and the fresh air humidity at the fresh air outlet, and controls the flow rate of the concentrated solution in the first hollow fiber membrane contactor based on the range of the humidity difference.

12. The method of operating an air conditioner according to claim 11, characterized in that: The absolute value of the humidity difference is positively correlated with the flow rate of the concentrated solution.

13. The method of operating an air conditioner according to claim 11, characterized in that: After the air conditioner activates its fresh air function, it also includes: When a humidification command is received, the humidity difference between the indoor humidity and the fresh air humidity at the fresh air outlet is obtained, and the water flow rate of the water distributor is controlled according to the range of the humidity difference.

14. The method of operating an air conditioner according to claim 13, characterized in that: The absolute value of the humidity difference is positively correlated with the water flow rate.

Images