Air handling system and method of controlling the same

Abstract

The application discloses an air treatment system and a control method, and belongs to the technical field of air treatment. The air treatment system comprises a fresh air humidifying and dehumidifying machine; the fresh air humidifying and dehumidifying machine comprises a fresh air duct, an adsorption assembly arranged in the fresh air duct and capable of absorbing moisture in fresh air in the fresh air duct when the fresh air humidifying and dehumidifying machine is in dehumidifying operation, and a fresh air blower for driving the fresh air in the fresh air duct to flow to indoor air; the air treatment system further comprises a fresh air humidity detection device for detecting the humidity of the fresh air, and a return air humidity detection device for detecting the humidity of indoor air. The control method comprises calculating a target fresh air humidity according to the humidity of indoor air and a set humidity of indoor air; determining whether the relationship between the fresh air humidity and the target fresh air humidity satisfies a first preset allowable condition, if not, controlling the fresh air blower to reduce speed, and if yes, keeping the current state. The air treatment system and the control method can realize rapid energy-saving dehumidifying.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air treatment, in particular to an air treatment system and a control method thereof. BACKGROUND

[0002] An air conditioner is a device for adjusting the temperature and humidity of indoor air, which discharges cooling air obtained through a refrigeration cycle to an indoor space, and the refrigeration cycle is usually composed of processes of compression, condensation, expansion and evaporation of a refrigerant, or discharges heating air obtained by reversing the above processes to the indoor space, thereby adjusting the indoor air. A fresh air humidifier is a device for introducing fresh air with adjusted humidity into an indoor space, which adjusts the indoor air by sending fresh air with appropriate humidity into the indoor space.

[0003] With the improvement of people's requirements for indoor environment, there are more and more scenes in which an air conditioner and a fresh air humidifier are used together. Since both devices have dehumidification functions, how to quickly and energy-efficiently dehumidify becomes a technical problem to be solved in the field. SUMMARY

[0004] The present application provides an air treatment system and a control method, which can realize fast and energy-efficient dehumidification.

[0005] In an aspect of the present application, an air treatment system comprises: a fresh air humidifier; the fresh air humidifier comprises: a fresh air duct; an adsorption assembly arranged in the fresh air duct, which absorbs moisture in fresh air in the fresh air duct when the fresh air humidifier is running in a dehumidification mode; and a fresh air blower for driving fresh air in the fresh air duct to flow to an indoor space.

[0006] The air treatment system further comprises:

[0007] a fresh air humidity detection device for detecting the humidity content of the fresh air; a return air humidity detection device for detecting the humidity content of indoor air; and a controller for: calculating a target supply air humidity content according to the detection value of the return air humidity detection device and the set humidity content of the indoor space in a fresh air dehumidification mode; and controlling the fresh air blower to reduce the speed when the relationship between the detection value of the fresh air humidity detection device and the target supply air humidity content does not satisfy a first preset allowable condition.

[0008] In some embodiments, the target supply air humidity content Dsa is calculated according to the following formula:

[0009] Dsa=ds-Wx / (Gx·ρ1);

[0010] Wx=Go×ρ2×|dra-ds|;

[0011] Wherein, ds represents the indoor set humidity content, dra represents the humidity content of indoor air, Wx represents the required dehumidification amount of the indoor space, Gx represents the fresh air supply amount of the fresh air humidifier, Go represents the volume of the indoor space, ρ1 represents the density of outdoor air, and ρ2 represents the density of indoor air.

[0012] In some embodiments, the air conditioner is further included, and the controller is configured to: when the fresh air supply fan is reduced to the preset rotation speed value, if the relationship between the detection value of the fresh air humidity detection device and the target supply humidity content still does not satisfy the first preset allowable condition, control the fresh air supply fan to resume the preset default rotation speed operation, and the air conditioner starts dehumidification.

[0013] In some embodiments, in the fresh air dehumidification mode, the air conditioner is turned off or runs in a high sensible heat mode.

[0014] In some embodiments, after the fresh air supply fan is reduced to run for a preset time t1, it is determined whether the relationship between the detection value of the fresh air humidity detection device and the target supply humidity content satisfies the first preset allowable condition, and if not, the fresh air supply fan continues to be reduced.

[0015] In some embodiments, the air conditioner is further included, and the air conditioner comprises a refrigerant circuit formed by a second compressor, a second four-way valve, an outdoor heat exchanger, a second expansion valve, and an indoor heat exchanger.

[0016] The controller is configured to:

[0017] In the common dehumidification mode, the required dehumidification amount of the air conditioner is calculated according to the indoor air humidity content and the indoor set humidity content, the second compressor target frequency is obtained by looking up a table according to the required dehumidification amount of the air conditioner, and the second compressor is controlled to run at the target frequency.

[0018] In some embodiments, the controller is configured to:

[0019] After the second compressor runs at the target frequency for a preset time t2, it is determined whether the relationship between the indoor return air humidity content and the indoor set humidity content satisfies the second preset allowable condition, if yes, the second compressor is turned off, and if not, the second compressor is frequency-increased.

[0020] In some embodiments, the required dehumidification amount Wx2 of the air conditioner is calculated according to the following formula:

[0021] Wx2=Gin×ρ2×|dra-ds|;

[0022] Wherein, dra represents the indoor air humidity content, ds represents the indoor set humidity content, Gin represents the supply amount of the air conditioner indoor unit, and ρ2 represents the density of indoor air.

[0023] In some embodiments, the controller is configured to control the fresh air humidifier to operate at a preset default rotation speed in the common dehumidification mode.

[0024] In another aspect of the present application, a control method of an air handling system, the air handling system comprising: a fresh air humidifier, the fresh air humidifier comprising: a fresh air duct; an adsorption assembly arranged in the fresh air duct, the adsorption assembly absorbing moisture of fresh air in the fresh air duct when the fresh air humidifier is in a dehumidification mode; and a fresh air blower configured to drive the fresh air in the fresh air duct to flow to an indoor space;

[0025] The control method comprises:

[0026] obtaining an indoor air humidity content, an indoor set humidity content, and a fresh air supply humidity content;

[0027] calculating a target fresh air supply humidity content based on the indoor air humidity content and the indoor set humidity content;

[0028] determining whether a relationship between the fresh air supply humidity content and the target fresh air supply humidity content satisfies a first preset allowable condition, and if not, controlling the fresh air blower to reduce the rotation speed, and if so, maintaining a current state. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A use scenario diagram of an air handling system according to some embodiments is shown;

[0030] Figure 2 A schematic diagram of a fresh air humidifier of an air handling system according to some embodiments is shown;

[0031] Figure 3 A schematic diagram of a refrigeration system in a fresh air humidifier of an air handling system according to some embodiments is shown;

[0032] Figure 4 A schematic diagram of a refrigeration system in an air conditioner of an air handling system according to some embodiments is shown;

[0033] Figure 5 A control block diagram of an air handling system according to some embodiments is shown;

[0034] Figure 6 A flowchart of a fresh air dehumidification mode of an air handling system according to some embodiments is shown;

[0035] Figure 7 A flowchart of a common dehumidification mode of an air handling system according to some embodiments is shown;

[0036] In the above figures: 100, air handling system; 200, air conditioner; 210, outdoor unit; 213, second compressor; 214, outdoor heat exchanger; 215, second four-way valve; 216, second expansion valve; 220, indoor unit; 221, indoor heat exchanger;

[0037] 300, fresh air humidifier; 310, fresh air duct; 320, exhaust air duct; 330, adsorption wheel; 340, fresh air fan; 350, indoor exhaust fan; 360, first heat exchanger; 370, second heat exchanger; 381, first compressor; 382, first four-way valve; 383, first expansion valve;

[0038] 400, controller; 410, memory; 420, communication module; 430, input unit; 440, indoor temperature and humidity detection device; 450, fresh air humidity detection device. DETAILED DESCRIPTION

[0039] In order to make the purpose and implementation of the present application more clear, the exemplary embodiments of the present application will be described clearly and completely below in combination with the drawings of the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application.

[0040] The embodiments of the present application will be described in detail below with reference to the drawings.

[0041] Referring to Figure 1 The air handling system 100 of the embodiments of the present application includes an air conditioner 200 and a fresh air humidifier 300.

[0042] The fresh air humidifier 300 generally uses an adsorption assembly made of adsorption material and a refrigeration system in combination to adjust the sensible and latent heat load of fresh air. The working principle thereof is mainly to adjust the adsorption inlet temperature through the evaporator of the refrigeration system, and the condenser of the refrigeration system discharges heat to regenerate the adsorption material, so as to realize continuous adsorption and desorption of the adsorption material.

[0043] The fresh air humidifier generally has two structural forms, one is a rotary wheel structure: the adsorption assembly is a rotary wheel, and the rotation of the rotary wheel realizes the alternation of adsorption and regeneration; the other is a duct switching structure: the adsorption assembly is fixed, and the fresh air duct and the exhaust air duct are switched constantly to realize the alternation of adsorption and regeneration.

[0044] The structure of the fresh air humidifier 300 will be briefly described below taking the rotary wheel type fresh air humidifier as an example:

[0045] Referring to Figure 2 The fresh air humidifier 300 includes a fresh air duct 310 and an exhaust air duct 320, the fresh air duct 310 is used to send outdoor fresh air into the indoor, and the exhaust air duct 320 is used to exhaust indoor air to the outdoor.

[0046] A portion of the adsorption wheel 330 is located in the fresh air duct 310, and another portion is located in the exhaust air duct 320.

[0047] The fresh air blower 340 is arranged in the fresh air duct 310 and is used to drive outdoor fresh air into the indoor space along the fresh air duct 310.

[0048] The indoor exhaust blower 350 is arranged in the exhaust air duct 320 and is used to drive indoor air to the outdoor space along the exhaust air duct 320.

[0049] The first heat exchanger 360 is arranged in the fresh air duct 310 and is located on the windward side of the adsorption wheel 330. The second heat exchanger 370 is arranged in the exhaust air duct 320 and is located on the windward side of the adsorption wheel 330.

[0050] With reference to Figure 3 , the fresh air humidifier 300 has a refrigeration system, which has the same structure and working principle as the refrigeration system of an air conditioner. The refrigeration system has: a first compressor 381 for compressing refrigerant; a second heat exchanger 370 for performing heat exchange between exhaust air in the exhaust air duct 320 and refrigerant; a first heat exchanger 360 for performing heat exchange between fresh air in the fresh air duct 310 and refrigerant; a first four-way valve 382 for selectively guiding refrigerant compressed by the first compressor 381 to the second heat exchanger 370 or the first heat exchanger 360 according to a dehumidification mode or a humidification mode; and a first expansion valve 383 for decompressing refrigerant.

[0051] In the dehumidification mode, the first heat exchanger 360 is an evaporator, so that the temperature of fresh air is reduced, and the adsorption wheel 330 absorbs moisture in the fresh air, so that the fresh air is dehumidified and then sent into the indoor space. The second heat exchanger 370 is a condenser and is used to heat exhaust air, so that the adsorption wheel 330 is regenerated. In the humidification mode, the second heat exchanger 370 is an evaporator, so that the temperature of exhaust air is reduced, and the adsorption wheel 330 absorbs moisture in the exhaust air. The first heat exchanger 360 is a condenser and is used to heat fresh air, so that the adsorption wheel 330 absorbs moisture and is separated, and thus the fresh air is humidified.

[0052] The following briefly describes the structure of the air conditioner:

[0053] With reference to Figure 1 , the air conditioner 200 includes an outdoor unit 210 for performing heat exchange between refrigerant and outdoor air, and an indoor unit 220 located in an indoor space for performing heat exchange between refrigerant and indoor air.

[0054] The outdoor unit 210 and the indoor unit 220 in the air conditioner 200 can be separated, in which case the outdoor unit 210 is located in an outdoor space and the indoor unit 220 is located in an indoor space. The indoor unit 220 can be a multi-split unit having multiple indoor units to be applied in places such as shopping malls, office buildings, factories, etc.

[0055] In other embodiments, the air conditioner 200 can also be an all-in-one unit, i.e., the outdoor unit 210 and the indoor unit 220 are integrated on one housing. The all-in-one unit is more commonly used in scenarios of ceiling installation. The outdoor unit 210 is in communication with the outdoor space through a duct, and the indoor unit 220 is in communication with the indoor space through a duct.

[0056] The air conditioner further comprises a refrigeration system, in combination with Figure 4 The refrigeration system has: a second compressor 213 for compressing refrigerant; an outdoor heat exchanger 214 for performing heat exchange between outdoor air and refrigerant; an indoor heat exchanger 223 for performing heat exchange between indoor air and refrigerant; a second four-way valve 215 for selectively guiding the refrigerant compressed by the second compressor 213 to the outdoor heat exchanger 214 or the indoor heat exchanger 221 according to a heating mode or a cooling mode; and a second expansion valve 216 for decompressing the refrigerant.

[0057] The air conditioner has a high sensible heat mode, which refers to a mode of operation of the air conditioner when performing cooling or dehumidification. The sensible heat ratio of the air conditioner when operating in the high sensible heat mode is higher than that of the air conditioner operating in other modes. When the air conditioner is in the high sensible heat mode, the second expansion valve of the refrigeration system has a small opening degree, and the second compressor has a low operating frequency.

[0058] In the following, the signal flow between the components included in the air handling system will be described.

[0059] Referring to Figure 5 The controller 400 is configured to receive detection data of the air conditioner 200 and the fresh air humidifier 300 and to change the operation of the air conditioner 200 and the fresh air humidifier 300 after calculation.

[0060] The memory 410 is configured to store programs and data related to the operation of the air handling system. The memory 410 can be implemented by at least one of a non-volatile memory (e.g., a cache, a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), and a flash memory), a volatile memory (e.g., a random access memory (RAM)), or a storage medium such as a hard disk drive (HDD) and a CD-ROM, but is not limited thereto.

[0061] The communication module 420 is configured to enable communication between the controller 400 and the air conditioner 200, and between the controller 400 and the fresh air humidifier 300. For example, the detection information of the temperature and humidity of the air conditioner 200 and the fresh air humidifier 300 can be shared to the controller 400 through the communication module 320.

[0062] The communication module 420 can be wired communication or wireless communication. The wireless communication can use at least one of fifth generation (5G) mobile communication, long term evolution (LTE), LTE-advanced (LTE-A), code division multiple access (CDMA), wideband CDMA (WCDMA), universal mobile telecommunications system (UMTS), wireless broadband (WiBro), or global mobile communication system (GSM) as a cellular communication protocol. In addition, the wireless communication can include local communication, which can include at least one of wireless fidelity (WiFi), Bluetooth, or near field communication (NFC). The wired communication can include at least one of universal serial bus (USB), high definition multimedia interface (HDMI), recommended standard 232 (RS-232), or plain old telephone service (POTS).

[0063] The input unit 430 can receive an input from a user. The input unit can include a button-type switch, a membrane switch, or a touch panel, etc. for receiving an operation command for the air handling system. Specifically, the input unit can receive the indoor set humidity ds from the user.

[0064] The indoor humidity detection device 440 can be provided at the return air inlet of the indoor unit 220 or at the return air inlet of the fresh air humidifier 300 to detect the indoor air humidity dra of the indoor space.

[0065] The fresh air humidity detection device 450 can be provided at the supply air inlet of the fresh air humidifier 300 to detect the fresh air supply humidity dsa.

[0066] Hereinafter, a method of an operation mode of the air handling system will be described.

[0067] In some embodiments of the present application, a fresh air dehumidification mode in which the fresh air humidifier dehumidifies mainly, and a common dehumidification mode in which the fresh air humidifier and the air conditioner dehumidify together can be implemented.

[0068] <Fresh air dehumidification mode>

[0069] The fresh air humidifier operates in the dehumidification mode: the fresh air supply fan operates at a preset default air speed.

[0070] Referring to Figure 6 S100, the required dehumidification amount Wx of the indoor space is calculated based on the indoor air humidity dra and the indoor set humidity ds, and the target supply air humidity Dsa is calculated based on the required dehumidification amount Wx of the indoor space.

[0071] Wx=Go x p2 x |dra-ds| ;

[0072] Dsa=ds-Wx / (Gx p1) ;

[0073] dra represents the indoor air humidity, Gx represents the fresh air supply of the fresh air humidifier, Go represents the indoor space volume, p1 represents the density of the outdoor air, and p2 represents the density of the indoor air.

[0074] In the present application, the dehumidification amount Wx required by the indoor space is estimated according to the indoor air humidity dra and the indoor set humidity ds, compared with the dehumidification amount calculated by the indoor humidity load, the detection device such as the human body sensor needs to be set, the detection device can be omitted in the present application, and the system structure is simplified.

[0075] In the process of dehumidification of the fresh air humidifier, the indoor humidity changes constantly, therefore, Wx calculated according to the difference between dra and ds is also constantly changing, so that the relationship between the current fresh air supply humidity and the target fresh air supply humidity can achieve the purpose of accurate adjustment.

[0076] S101, judging whether the relationship between the fresh air supply humidity dsa and the target fresh air supply humidity Dsa meets the first preset allowable condition, if yes, entering S102, the fresh air humidifier keeps the current running state; if not, entering S103, reducing the speed of the fresh air blower.

[0077] Specifically, the first preset allowable condition is: dsa≤Dsa-A, A is a preset value, for example, A=1.

[0078] If dsa≤Dsa-1 is established, it is indicated that the fresh air supply humidity is not higher than the target fresh air supply humidity, then entering S102, the fresh air humidifier continues to run according to the current state; if not, that is, dsa>Dsa-1, it is indicated that the fresh air supply humidity is relatively large, then entering S103, reducing the speed of the fresh air blower.

[0079] The speed of the fresh air blower is reduced, the fresh air supply is reduced, and the fresh air supply humidity can be reduced, so that the indoor humidity is reduced.

[0080] In some embodiments of the present application, the speed of the fresh air blower can be reduced by a preset multiple, for example, the speed of the fresh air blower is reduced by 10% each time, and then returns to S101 to rejudge after a preset time t1, if it is still judged as not established, then the speed of the fresh air blower continues to be reduced by 10%.

[0081] S104, when the rotational speed of the fresh air blower is reduced to the preset air speed value, and dsa≤Dsa-1 is not true, then enter S200, the common dehumidification mode of the fresh air dehumidifier and the air conditioner.

[0082] Exemplarily, the preset air speed value is 50% of the default air speed. When the rotational speed of the fresh air blower is reduced to not higher than 50% of the default air speed, dsa≤Dsa-1 is still not true, and then the common dehumidification mode is switched to.

[0083] The rotational speed of the fresh air blower is relatively low, which indicates that the adjustment speed of the fresh air dehumidifier to the indoor humidity is also relatively slow, which will affect the user's comfort feeling of the indoor. At this time, the air conditioner is added to the common dehumidification, which can accelerate the adjustment speed of the indoor humidity.

[0084] In the fresh air dehumidification mode, the air conditioner is in the off or high sensible heat mode to achieve the purpose of energy saving.

[0085] According to the embodiment of the present application, the fresh air dehumidifier is used for dehumidification first, and the air conditioner is added to the common dehumidification in the case that the fresh air dehumidifier has a poor dehumidification effect. In this way, the balance of energy saving and dehumidification speed can be achieved. If the air handling system directly performs the common dehumidification of the fresh air dehumidifier and the air conditioner at the beginning, although the dehumidification speed can be ensured, the energy consumption will inevitably be increased. If the fresh air dehumidifier itself can achieve the dehumidification effect, and the air conditioner does not dehumidify, then the energy can be saved.

[0086] <Common dehumidification mode>

[0087] Referring to Figure 7 , the air conditioner and the fresh air dehumidifier are turned on, and S201, the fresh air dehumidifier operates at a preset default frequency and air speed.

[0088] S202, the target compressor frequency FX2 of the air conditioner is obtained according to the indoor moisture content dra and the indoor set moisture content ds.

[0089] In this step, the required dehumidification amount Wx2 of the indoor is first calculated according to the formula, and then the target evaporating temperature is obtained by looking up the table, so as to obtain the target compressor frequency.

[0090] Wherein, Wx2=Gin×ρ2×|dra-ds|, Gin is the air supply amount of the indoor unit of the air conditioner, and ρ2 represents the indoor air density.

[0091] The corresponding table of indoor temperature, humidity, evaporating temperature and dehumidification amount, and the corresponding compressor frequency under different evaporating temperatures are stored in the memory, and these tables are obtained from experimental data.

[0092] Therefore, the dehumidification amount Wx2 is first calculated, and the final target compressor frequency FX can be obtained by looking up the table according to the dehumidification amount Wx2.

[0093] S203, controlling the second compressor to operate according to the target compressor frequency FX2, and after operating for a preset time t2, entering S204.

[0094] S204, judging whether the relationship between the indoor air humidity content and the indoor set humidity content satisfies a second preset allowable condition, if yes, entering S205, the air conditioner is turned off; if no, entering S206, controlling the second compressor to increase the frequency.

[0095] Exemplarily, the second preset allowable condition is dra≤ds-A, A is a preset value, for example, if dra≤ds-1 is established, it indicates that the return air humidity is close to the indoor set humidity, and the air conditioner can no longer dehumidify at this time; if dra≤ds-1 is not established, it indicates that the indoor humidity is still higher than the indoor set humidity, and the air conditioner needs to increase dehumidification.

[0096] In S205, after the air conditioner is turned off, every interval preset time t3, enter S207, judging whether the indoor air humidity content is not less than the sum of the indoor set humidity content and a preset allowable value, if yes, entering S208, the air conditioner is turned on.

[0097] Specifically, dra≥ds+A, A is a preset value, for example, A=1, if dra≥ds+1 is established, it indicates that the indoor humidity has risen and exceeds the indoor set humidity, at this time the air conditioner needs to be turned on.

[0098] In a specific application scenario, the indoor environment will cause the indoor humidity to rise due to sudden increase of personnel, user laundry and other operations, so after the air conditioner is turned off, it is also necessary to detect whether the indoor humidity has risen, so as to respond to the change of indoor humidity in time.

[0099] In S206, the compressor increases the frequency and operates, after a preset time t4, return to S204 to rejudge, if still not satisfied, control the compressor to continue to increase the frequency.

[0100] <Automatic dehumidification mode>

[0101] The system first performs the fresh air dehumidification mode, during the operation of the fresh air dehumidification mode, when the speed of the fresh air supply fan is reduced to a preset speed value, and dsa≤Dsa-1 is not established, the common dehumidification mode is automatically entered, and the speed of the fresh air supply fan is restored to the preset default speed.

[0102] The application sets up a fresh air dehumidification mode, a common dehumidification mode and an automatic dehumidification mode in the air treatment system, which can adapt to various needs of users, for example, when the indoor humidity needs to be slightly dehumidified (the difference between the indoor humidity and the expected humidity of the user is not too large), the fresh air dehumidification mode can be selected; when the indoor humidity needs to be deeply dehumidified (the difference between the indoor humidity and the expected humidity of the user is large), the common dehumidification mode can be selected to speed up the dehumidification speed; or the user can select the automatic dehumidification, which is automatically judged by the system.

[0103] In the application, the fresh air dehumidifier or the air conditioner is controlled according to the dehumidification amount, which can improve the dehumidification efficiency and realize rapid dehumidification.

[0104] In the application, the fresh air dehumidification mode is performed when the fresh air dehumidifier can bear the dehumidification amount, which can achieve the purpose of energy saving compared with the common dehumidification of the fresh air dehumidifier and the air conditioner.

[0105] In the application, the common dehumidification of the fresh air dehumidifier and the air conditioner can speed up the dehumidification speed in the case of a large dehumidification amount.

[0106] In the application, the dehumidification amount required by the indoor space is estimated according to the indoor air humidity dra and the indoor set humidity ds, which can omit the detection device and simplify the system structure compared with setting various detection devices such as human body sensors when the dehumidification amount is calculated by the indoor humidity load.

[0107] In the application, the dehumidification amount required by the indoor space is estimated according to the indoor air humidity dra and the indoor set humidity ds, and then the target supply air humidity is obtained according to the dehumidification amount, and the fresh air dehumidifier is controlled according to the relationship between the current fresh air supply humidity and the target fresh air supply humidity, which can achieve the purpose of accurate adjustment.

[0108] In the application, when the fresh air supply humidity is large, the rotation speed of the fresh air supply fan is reduced to reduce the supply amount of the fresh air, so that the fresh air can be fully dehumidified by the adsorption assembly, thereby achieving the purpose of reducing the fresh air supply humidity.

[0109] In the application, when the rotation speed of the fresh air supply fan is reduced to a certain value, if the indoor humidity still does not meet the requirements, the common dehumidification mode is performed, which can avoid the problem of slow dehumidification speed when only the fresh air dehumidifier dehumidifies.

[0110] In the application, the fresh air dehumidification mode, the common dehumidification mode and the automatic dehumidification mode can be realized, which meets the diversified needs of users.

[0111] The terms "including", "having", etc. are used to specify features, numbers, steps, operations, elements, components, or combinations of features, numbers, steps, operations, elements, and components, but do not exclude the presence or addition of one or more features, elements, steps, operations, components, or combinations of features, numbers, steps, operations, elements, and components.

[0112] Terms such as “unit”, “part”, “block”, “component” and “module” indicate a unit used to perform at least one function or operation. For example, these terms may refer to at least one process processed by at least one piece of hardware (such as a field-programmable gate array (FPGA), application-specific integrated circuit (ASIC)), at least one piece of software stored in a memory or processor.

[0113] The identification codes are used for ease of description, but are not intended to indicate the order of each step. Unless the context clearly indicates otherwise, each step may be performed in a different order than that shown.

[0114] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0116] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An air handling system, characterized by, The air handling system comprises: a fresh air conditioning machine and an air conditioner; the fresh air conditioning machine comprises: a fresh air duct; an adsorption assembly arranged in the fresh air duct, which absorbs moisture in fresh air in the fresh air duct when the fresh air conditioning machine is in dehumidification operation; a fresh air blower for driving fresh air in the fresh air duct to flow to the indoor space; the air handling system further comprises: a fresh air humidity detection device for detecting the humidity of the fresh air; a return air humidity detection device for detecting the humidity of the indoor air; the air handling system further comprises: a controller configured to: in the fresh air dehumidification mode, calculate a target fresh air humidity based on the detection value of the return air humidity detection device and the indoor set humidity; and control the fresh air blower to reduce the speed when the relationship between the detection value of the fresh air humidity detection device and the target fresh air humidity does not satisfy a first preset allowable condition. The target fresh air humidity Dsa is calculated according to the following formula: Wx=Go×ρ2×|dra-ds|; ； wherein, ds represents the indoor set humidity, dra represents the humidity of the indoor air, Wx represents the required dehumidification amount of the indoor space, Gx represents the fresh air supply amount of the fresh air conditioning machine, Go represents the volume of the indoor space, ρ1 represents the density of the outdoor air, and ρ2 represents the density of the indoor air. The first preset allowable condition is that the fresh air humidity dsa is less than or equal to Dsa-A, and A is a preset value.

2. The air handling system according to claim 1, wherein in the fresh air dehumidification mode, the air conditioner is turned off or runs in a high sensible heat mode. After the fresh air blower runs at a reduced speed for a preset time t1, it is determined whether the relationship between the detection value of the fresh air humidity detection device and the target fresh air humidity satisfies the first preset allowable condition; if not, the fresh air blower continues to reduce the speed.

3. The air treatment system of claim 1, wherein, 4. The air handling system according to claim 1, wherein the air conditioner comprises a refrigerant circuit formed by a second compressor, a second four-way valve, an outdoor heat exchanger, a second expansion valve, and an indoor heat exchanger; the controller is configured to: in the common dehumidification mode, calculate the required dehumidification amount of the air conditioner based on the humidity of the indoor air and the indoor set humidity, and obtain a target frequency of the second compressor based on the required dehumidification amount of the air conditioner; and control the second compressor to run at the target frequency. the controller is configured to:

5. The air treatment system of claim 4, wherein, after the second compressor runs at the target frequency for a preset time t2, determine whether the relationship between the humidity of the indoor return air and the indoor set humidity satisfies a second preset allowable condition; if yes, the second compressor is turned off; if not, the second compressor increases the frequency. The required dehumidification amount Wx2 of the air conditioner is calculated according to the following formula:

6. The air treatment system of claim 4, wherein, Wx2=Gin×ρ2×|dra-ds|; wherein, dra represents the humidity of the indoor air, ds represents the indoor set humidity, Gin represents the supply amount of the air conditioner indoor unit, and ρ2 represents the density of the indoor air. the controller is configured to:

7. The air treatment system of claim 4, wherein, ​ In the common dehumidification mode, the fresh air humidifier is controlled to run at a preset default rotating speed.

8. A control method of an air handling system, characterized by, The air treatment system comprises a fresh air humidifier and an air conditioner; The fresh air humidifier comprises: a fresh air duct; an adsorption assembly arranged in the fresh air duct, which absorbs moisture in the fresh air in the fresh air duct when the fresh air humidifier is dehumidified; a fresh air blower for driving the fresh air in the fresh air duct to flow to the indoor space; The control method comprises: obtaining the indoor air humidity, the indoor set humidity and the fresh air supply humidity; calculating the target supply humidity according to the indoor air humidity and the indoor set humidity; judging whether the relationship between the fresh air supply humidity and the target supply humidity meets a first preset allowable condition, if not, controlling the fresh air blower to reduce the rotating speed, if yes, keeping the current state; when the fresh air blower is reduced to a preset rotating speed, and the relationship between the detection value of the fresh air humidity detection device and the target supply humidity still does not meet the first preset allowable condition, controlling the fresh air blower to run at the preset default rotating speed, and the air conditioner starts dehumidification; the target supply humidity Dsa is calculated according to the following formula: ； Wx=Go×ρ2×|dra-ds|; wherein, ds represents the indoor set humidity, dra represents the indoor air humidity, Wx represents the required dehumidification amount of the indoor space, Gx represents the fresh air supply amount of the fresh air humidifier, Go represents the volume of the indoor space, ρ1 represents the density of the outdoor air, and ρ2 represents the density of the indoor air; the first preset allowable condition is that the fresh air supply humidity Dsa≤Dsa-A, and A is a preset value.

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