Air treatment system and control method thereof

Abstract

The invention discloses an air treatment system and a control method thereof, and belongs to the technical field of air treatment. The air treatment system comprises a fresh air humidifying machine. The fresh air humidifying machine comprises a fresh air duct and an exhaust air duct. The adsorption assembly is arranged in the fresh air duct and the exhaust air duct; the refrigerating system comprises a refrigerant loop formed by a first compressor, a first four-way valve, a second heat exchanger, a first expansion valve and a first heat exchanger; the first heat exchanger is arranged in the fresh air duct, and the second heat exchanger is arranged in the exhaust air duct. The method comprises the steps that in a fresh air dehumidification mode, the target air supply moisture content is calculated according to the indoor set moisture content and the indoor wet load generated by an indoor wet source; the difference value between the target air supply moisture content and the initial target air supply moisture content is judged, and when the difference value is larger than the upper limit value of the preset moisture allowance interval, the first compressor is controlled to be subjected to frequency reduction; and when the difference value is smaller than the lower limit value of the preset moisture-allowed interval, controlling the first compressor to raise frequency. The air treatment system can quickly respond to the wet load.

Description

Technical Field

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

[0002] At present, the dehumidification devices for indoor air mainly include fresh air humidifiers and air conditioners. Fresh air humidifiers are devices that introduce humidified fresh air into the room. Fresh air humidifiers adjust the indoor air by sending fresh air with appropriate humidity into the room. Air conditioners are devices used to adjust the temperature and humidity of indoor air. Air conditioners discharge the cooled air obtained through the refrigeration cycle into the indoor space. The refrigeration cycle usually consists of the compression, condensation, expansion and evaporation of the refrigerant, or the air conditioners discharge the heated air obtained by the reverse process into the indoor space, thereby adjusting the indoor air.

[0003] These devices are usually controlled by the deviation between the indoor humidity and the indoor set humidity. However, due to the continuous changes in indoor humidity load, such as a sudden increase in the number of people, users cooking, washing clothes, etc., they cannot be fed back to the indoor humidity detection in time, resulting in a lag in dehumidification operation. Summary of the invention

[0004] The present application provides an air handling system and a control method, which can quickly respond to wet loads.

[0005] One aspect of the present application provides a control method for an air handling system, wherein the air handling system includes a fresh air humidifier; the fresh air humidifier includes: a fresh air duct and an exhaust air duct; an adsorption component, which is arranged in the fresh air duct and the exhaust air duct, and the adsorption component absorbs moisture from the fresh air in the fresh air duct when the fresh air humidifier is in dehumidification operation; a refrigeration system includes a refrigerant circuit formed by a first compressor, a first four-way valve, a second heat exchanger, a first expansion valve and a first heat exchanger; the first heat exchanger is arranged in the fresh air duct, and the second heat exchanger is arranged in the exhaust air duct; the control method includes: in the fresh air dehumidification mode, calculating the target supply air humidity content according to the indoor set humidity content and the indoor humidity load generated by the indoor humidity source; judging the difference between the target supply air humidity content and the initial target supply air humidity content, and controlling the first compressor to reduce the frequency when the difference is greater than the upper limit of the preset allowable humidity interval; and controlling the first compressor to increase the frequency when the difference is less than the lower limit of the preset allowable humidity interval.

[0006] In some embodiments, the target air supply humidity content dsa is calculated based on the indoor set humidity content and the indoor humidity load generated by the indoor humidity source. i The specific formula is:

[0007] dsa i =ds-W i / (Gs1·ρ1);

[0008] Where, ds represents the indoor set humidity content, W i represents the indoor wet load, Gs1 represents the set air supply volume of the fresh air humidifier; ρ1 represents the density of outdoor air.

[0009] In some embodiments, the air handling system further includes: an air conditioner; a controller for receiving information transmitted by the air conditioner and the fresh air humidifier and controlling the operation of the air conditioner and the fresh air humidifier;

[0010] Control methods include:

[0011] The total indoor wet load is obtained according to the indoor wet load and the fresh air wet load;

[0012] Determine whether the difference between the maximum dehumidification load of the humidifier and the preset allowable value is not less than the total indoor humidity load. If so, the fresh air dehumidification mode is implemented; if not, the joint dehumidification mode of the fresh air humidifier and the air conditioner is implemented.

[0013] In some embodiments, the calculation formula of the new rheumatic load Wx1 is:

[0014] Wx1=Gs1·ρ1·(doa-ds);

[0015] Among them, ds represents the set indoor humidity content; doa represents the outdoor air humidity content; Gs1 represents the set air supply volume of the fresh air humidifier; ρ1 represents the density of the outdoor air.

[0016] In some embodiments, the method further includes: in the fresh air dehumidification mode, the air conditioner operates in a high sensible heat mode;

[0017] Determine the difference between the indoor set temperature and the indoor return air temperature. When the difference is greater than the upper limit of the preset temperature range, control the air conditioner to maintain the high sensible heat mode or shut down; when the difference is less than the lower limit of the preset temperature range, control the air conditioner to exit the high sensible heat mode.

[0018] In some embodiments, it also includes: in the common dehumidification mode, determining whether the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidification load, if so, the fresh air humidifier maintains the current state; if not, the first compressor increases the frequency.

[0019] In some embodiments, the method further includes: in the common dehumidification mode, when the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidity load, determining that dra-ds≤W i / (Gs1·ρ1)+A is true, if so, the air conditioner is controlled to maintain the high sensible heat mode; if not, the air conditioner is controlled to exit the high sensible heat mode;

[0020] Under the condition that the maximum dehumidification load of the fresh air humidifier is not greater than the fresh air humidity load, when the difference between dsa and ds is within the preset range, the indoor relative humidity is not higher than the preset humidity critical value and dra-ds≤Wi / (Gs1·ρ1)+B, the air conditioner is controlled to maintain the high sensible heat mode; when the difference between dsa and ds is greater than the upper limit of the preset interval and dra-ds>W i / (Gs1·ρ1)+B, the air conditioner is controlled to exit the high sensible heat mode;

[0021] Among them, dsa represents the humidity content of fresh air supply; ds represents the set humidity content of indoor air; dra represents the humidity content of indoor return air; W i represents the indoor wet load; Gs1 represents the set air supply volume of the fresh air humidifier; ρ1 represents the density of outdoor air; C represents the preset value.

[0022] In some embodiments, when the difference between dsa and ds is greater than the upper limit of the preset interval and dra-ds>W i / (Gs1·ρ1)+B, the air conditioner is controlled to exit the high sensible heat mode and to operate below the preset low evaporating temperature.

[0023] In some embodiments, the indoor moisture load includes at least one of moisture dissipation from human bodies, plants, clothes drying, kitchens, and bathrooms.

[0024] In another aspect of the present application, an air treatment system includes: a fresh air humidifier and an air conditioner; the fresh air humidifier includes: an air duct system, having a fresh air duct and an exhaust air duct; an adsorption component, which is arranged in the fresh air duct and the exhaust air duct, and the adsorption component absorbs moisture from the fresh air in the fresh air duct when the fresh air humidifier is in dehumidification operation; a refrigeration system, including a refrigerant circuit formed by a first compressor, a first four-way valve, a second heat exchanger, a first expansion valve and a first heat exchanger; the first heat exchanger is arranged in the fresh air duct, and the second heat exchanger is arranged in the exhaust air duct; the air treatment system also includes: a controller, which is used to:

[0025] In fresh air dehumidification mode, the air conditioner operates in high sensible heat mode;

[0026] Calculate the target air supply humidity content based on the indoor set humidity content and the indoor humidity load generated by the indoor humidity source;

[0027] The difference between the target air supply humidity content and the initial target air supply humidity content is determined. When the difference is greater than the upper limit of the preset allowable humidity range, the frequency of the first compressor is controlled to be reduced; when the difference is less than the lower limit of the preset allowable humidity range, the frequency of the first compressor is controlled to be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 shows a schematic diagram of an air handling system according to some embodiments;

[0029] Figure 2 A schematic diagram of a fresh air humidifier of an air handling system according to some embodiments is shown;

[0030] Figure 3 A schematic diagram showing a refrigeration system in a fresh air humidifier of an air handling system according to some embodiments is shown;

[0031] Figure 4 A schematic diagram showing a refrigeration system in an air conditioner of an air handling system according to some embodiments;

[0032] Figure 5 shows a signal control block diagram of an air handling system according to some embodiments;

[0033] Figure 6 A flow chart showing a fresh air dehumidification mode of an air handling system according to some embodiments;

[0034] Figure 7 A flow chart illustrating a common dehumidification mode of an air handling system according to some embodiments;

[0035] Figure 8 A flow chart illustrating an automatic dehumidification mode of an air handling system according to some embodiments;

[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 rotor; 340, fresh air blower; 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, human body detection device; 460, clothing humidity detection device; 470, kitchen humidity sensor; 480, bathroom humidity sensor; 490, fresh air supply humidity detection device. DETAILED DESCRIPTION

[0039] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0040] Embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings.

[0041] Reference Figure 1 The air treatment system 100 of the embodiment of the present application includes an air conditioner 200 and a fresh air humidifier 300.

[0042] The fresh air humidifier 300 usually uses an adsorption component made of adsorption material and a refrigeration system to adjust the sensible heat and latent heat load of the fresh air. Its working principle 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, thereby achieving continuous adsorption and desorption of the adsorption material.

[0043] There are roughly two structural forms of fresh air humidifiers. One is a rotary structure: the adsorption component 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, in which the adsorption component is fixed, and the fresh air duct and the exhaust air duct are constantly switched to realize the alternation of adsorption and regeneration.

[0044] The structure of the fresh air humidifier 300 is briefly described below by taking a rotary fresh air humidifier as an example:

[0045] Reference 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 deliver outdoor fresh air into the room, and the exhaust air duct 320 is used to exhaust indoor air to the outside.

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

[0047] The fresh air blower 340 is disposed in the fresh air duct 310 , and is used to drive outdoor fresh air along the fresh air duct 310 into the room.

[0048] The indoor exhaust fan 350 is disposed in the exhaust duct 320 to drive the indoor air to be discharged to the outside along the exhaust duct 320 .

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

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

[0051] In the dehumidification mode, the first heat exchanger 360 is an evaporator, which reduces the temperature of the fresh air. The adsorption wheel 330 absorbs moisture from the fresh air, so that the fresh air is dehumidified and sent into the room. The second heat exchanger 370 is a condenser, which is used to heat the exhaust air, thereby regenerating the adsorption wheel 330; in the humidification mode, the second heat exchanger 370 is an evaporator, which reduces the temperature of the exhaust air. The adsorption wheel 330 absorbs moisture from the exhaust air. The first heat exchanger 360 is a condenser, which is used to heat the fresh air, so that the moisture absorbed by the adsorption wheel 330 is separated, and the fresh air is humidified.

[0052] The following is a brief description of the air conditioning structure:

[0053] Reference Figure 1 The air conditioner 200 includes an outdoor unit 210 for performing heat exchange between a refrigerant and outdoor air; and an indoor unit 220, which is located in an indoor space and is used to perform heat exchange between a refrigerant and indoor air.

[0054] The outdoor unit 210 and the indoor unit 220 in the air conditioner 200 can be separated. In this case, the outdoor unit 210 is located in the outdoor space, and the indoor unit 220 is located in the indoor space. The indoor unit 220 can be a multi-split unit with multiple units for application in shopping malls, office buildings, factories, etc.

[0055] In other embodiments, the air conditioner 200 can also be an all-in-one machine, that is, the outdoor unit 210 and the indoor unit 220 are integrated in one shell. The all-in-one machine is often seen in ceiling installation scenarios. The outdoor unit 210 is connected to the outdoor space through an air duct, and the indoor unit 220 is connected to the indoor space through an air duct.

[0056] Air conditioning also includes a refrigeration system, combined with Figure 4The refrigeration system comprises: a second compressor 213 for compressing the refrigerant; an outdoor heat exchanger 214 for performing heat exchange between outdoor air and the refrigerant; an indoor heat exchanger 223 for performing heat exchange between indoor air and the 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 the heating mode or the 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 an operating mode of the air conditioner when it is cooling or dehumidifying; the sensible heat ratio when the air conditioner is operating in the high sensible heat mode is higher than that in other modes of the air conditioner. When the air conditioner is in the high sensible heat mode, the opening degree of the second expansion valve of the refrigeration system is small, and the operating frequency of the second compressor is low.

[0058] Hereinafter, signal flows between components included in the air handling system will be described.

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

[0060] The memory 410 is used 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 used to realize 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 temperature and humidity by 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 may be wired communication or wireless communication. The wireless communication may use at least one of the fifth generation (5G) mobile communication, long term evolution (LTE), advanced LTE (LTE-A), code division multiple access (CDMA), wideband CDMA (WCDMA), universal mobile telecommunications system (UMTS), wireless broadband (WiBro), or global system for mobile communications (GSM) as a cellular communication protocol; in addition, the wireless communication may include local communication, which may include at least one of wireless fidelity (WiFi), Bluetooth, or near field communication (NFC); ​​the wired communication may 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 may receive input from the user, and the input unit may include a button switch, a membrane switch, or a touch panel, etc. for receiving operation commands for the air handling system. Specifically, the input unit may receive the indoor set humidity content ds and the indoor set temperature Ts from the user.

[0064] The indoor temperature and humidity detection device 440 may be arranged at the return air outlet of the indoor unit 220, or may be arranged at the return air outlet of the fresh air humidifier 300, and is used to detect the indoor return air humidity dra, indoor return air temperature Tra and indoor relative humidity RHra of the indoor space;

[0065] The human detection device 450 is used to detect the number of people in the room, the movement status, etc. The human detection sensor 450 can be an infrared camera device, which can be set on the top of the room or the door of the room.

[0066] The outdoor humidity detection device 450 can be arranged at the fresh air inlet of the fresh air humidifier 300 to detect the outdoor air humidity content doa.

[0067] Hereinafter, a control method of an air handling system will be described.

[0068] When the air conditioner is running in high sensible heat mode, it means that the indoor temperature and humidity are relatively suitable. The fresh air humidifier is running in dehumidification mode, and the fresh air is dehumidified before being sent indoors. The fresh air will not cause a big change in indoor temperature and humidity. However, when the indoor humidity load changes suddenly, it is necessary to change the operation of the fresh air humidifier and air conditioner.

[0069] In some embodiments of the present application, a fresh air dehumidification mode in which dehumidification is mainly performed by a fresh air humidifier, and a joint dehumidification mode in which a fresh air humidifier and an air conditioner jointly dehumidify can be implemented.

[0070] <Fresh air dehumidification mode>

[0071] Figure 6A flow chart illustrating a fresh air dehumidification mode of an air handling system according to some embodiments.

[0072] S100, calculating the indoor moisture load generated by the indoor moisture source, and calculating the target air supply humidity content according to the indoor moisture load.

[0073] Among them, the indoor moisture load generated by indoor moisture sources includes moisture dissipation of the human body, various wet surfaces of non-enclosing structures, moisture dissipation of liquid surfaces or liquid flows (bathroom), moisture dissipation of food or gaseous materials (kitchen), etc.; considering the home environment, weekend gatherings of people, family gatherings, washing and drying clothes, and adding new plants will cause sudden changes in the indoor moisture load.

[0074] The indoor moisture load generated by the indoor moisture source includes at least one of the moisture dissipation of human body, plant, clothes drying, kitchen and bathroom.

[0075] Exemplarily, regarding the implementation method of calculating the amount of moisture dissipated by a human body:

[0076] The memory 410 pre-stores the moisture dissipation data of a single person, which can be obtained based on experimental data; the human body detection device 450 can detect the number of people, so the moisture dissipation of the human body can be obtained by the number of people*moisture dissipation of a single person.

[0077] In other embodiments, the moisture dissipation data of a single person can also be linked to the status of the person, for example, the moisture dissipation of a single person of a static person, the moisture dissipation of a single person of a dynamic person, etc. can be obtained through a large amount of experimental data. After the system receives the human body status and the number of people detected by the human body detection device 450, it searches for the corresponding data to obtain the moisture dissipation of the human body.

[0078] Exemplarily, regarding the implementation method of calculating the amount of moisture dissipated by plants:

[0079] When more plants are suddenly placed indoors, or when plants are removed, it will have an impact on the indoor moisture load. Therefore, the moisture dissipation of plants can be calculated into the indoor moisture load.

[0080] The memory 410 stores moisture dissipation data of different types of plants. The system receives the plant type and quantity input by the user in the input unit 430, and then searches for moisture dissipation data of the corresponding plant type. The moisture dissipation of the plant can be obtained by multiplying the number of plants by the searched data.

[0081] Exemplarily, regarding the implementation method of calculating the amount of moisture dissipated by clothes hung out to dry:

[0082] When clothes are hung out to dry in a room, the moisture dissipation of the clothes will also affect the indoor wet load. Therefore, the moisture dissipation of the clothes can be calculated into the indoor wet load.

[0083] The air handling system may include a clothing humidity measuring device 460, which may be disposed on a clothes drying rack or a washing machine. The clothing humidity measuring device 460 may be used to obtain the humidity of the clothing, and then convert the humidity of the clothing into a wet load of the clothing. Since the calculation method for converting the humidity into the wet load is a prior art, it will not be described here.

[0084] Exemplarily, regarding the implementation method of calculating the amount of moisture dissipated in the kitchen:

[0085] Since the moisture source in the kitchen will dissipate moisture to the target room (living room, bedroom, etc.), thereby affecting the moisture load of the target room, the moisture dissipated by food and electrical appliances in the kitchen can be calculated into the indoor moisture load.

[0086] The air handling system may include a kitchen humidity sensor 470 , through which the humidity of the kitchen may be detected and then converted into a kitchen wet load according to the humidity of the kitchen.

[0087] Exemplarily, regarding the implementation method of calculating the amount of moisture dissipated in the bathroom:

[0088] When the user takes a shower in the bathroom, the bathroom will release moisture to the target room (living room, bedroom, etc.), thereby affecting the moisture load of the target room. Therefore, the moisture source of the bathroom can be calculated into the indoor moisture load.

[0089] The air handling system may include a bathroom humidity sensor 480 , through which the humidity of the bathroom may be detected and then converted into a bathroom humidity load according to the humidity of the bathroom.

[0090] The controller receives the data fed back by the human body detection device 450, the plant information, the data fed back by the clothing testing device 460, the data fed back by the kitchen humidity sensor, and the data fed back by the bathroom humidity sensor, and then looks up the table based on these data and substitutes them into the corresponding formula to calculate the indoor humidity load W i =Human body moisture dissipation + plant moisture dissipation + clothes drying moisture dissipation + kitchen moisture dissipation + bathroom moisture dissipation.

[0091] Since the moisture dissipation of human body accounts for the vast majority of the indoor moisture load, in some embodiments, the indoor moisture load may only calculate the moisture dissipation of human body, while ignoring other moisture sources.

[0092] Then, the target air supply humidity content dsa is calculated according to the following formula: i :

[0093] dsa i =ds-W i / (Gs1·ρ1)

[0094] Where, ds represents the indoor set humidity content, Wi represents the indoor wet load, Gs1 represents the set air supply volume of the fresh air humidifier, and ρ1 represents the outdoor air density.

[0095] Since changes in indoor humidity load will cause changes in the target supply air humidity content, the present application can adopt a method of calculating the target supply air humidity content in real time, or calculate the target supply air humidity content according to a preset period. For example, the preset period is five minutes, and the target supply air humidity content is calculated every five minutes.

[0096] S101, determine the difference between the target supply air humidity content and the initial target supply air humidity content. When the difference is not less than the upper limit of the preset allowable humidity range, enter S102, control the first compressor of the fresh air humidifier to reduce the frequency; when the difference is not greater than the lower limit of the preset allowable humidity range, enter S103, control the first compressor of the fresh air humidifier to increase the frequency; when the difference is within the preset allowable humidity range, enter S104, keep the frequency of the fresh air humidifier unchanged.

[0097] Specifically, the preset humidity range is (-1, 1), -1, 1 and dsa i The units are consistent. When dsa i ≥dsa0+1, it means that the required target air supply humidity content increases, the indoor humidity will decrease, and the fresh air humidifier should slow down the dehumidification; when dsa i ≤dsa0-1, it means that the target air supply humidity content is reduced, the indoor humidity will increase, and the fresh air humidifier should speed up the dehumidification; when |dsa i When -dsa0|<1, it indicates that the target air supply humidity content has not changed significantly and the current state can be maintained.

[0098] In the related art, the dehumidification operation of the system is usually controlled by comparing the indoor return air humidity with the indoor set humidity. However, it takes a certain amount of time for the indoor moisture load to be fed back to the indoor humidity. For example, a sudden increase in the number of people indoors will not immediately cause a change in the indoor humidity, but will slowly dissipate the moisture into the air, which will cause a delay in the dehumidification response.

[0099] The present application predicts the change of indoor humidity in advance through the change of indoor wet load. For example, if the number of people indoors suddenly increases, the indoor wet load will change. At this time, dehumidification response is performed in advance. The system performs dehumidification response while the human body dissipates moisture into the room, which can avoid subsequent changes in indoor humidity.

[0100] In addition, if the indoor wet load is used directly to control the system operation, the response may not be accurate enough. For example, the increase in the number of people indoors causes the indoor wet load to increase, but the increased wet load does not necessarily cause a large change in indoor humidity. It is very likely that due to the increased wet load, the indoor humidity only fluctuates a little, and the system can maintain the current dehumidification to maintain the stability of the indoor humidity, and there is no need to increase the dehumidification frequency.

[0101] In the present application, the indoor wet load is converted into a target supply air humidity content, and the target supply air humidity content can reflect the precise changes in indoor humidity in the future. Therefore, controlling the system operation according to the supply air humidity content can make the system operation more precise.

[0102] In the application, after the first compressor increases its frequency, it returns to S101 after t1 time to re-judge the difference. When the difference is still not greater than the lower limit of the preset allowable humidity range, the first compressor is controlled to continue increasing its frequency. Similarly, after the first compressor decreases its frequency, it returns to S101 after t1 time to re-judge the difference. When the difference is still not less than the upper limit of the preset allowable humidity range, the first compressor is controlled to continue decreasing its frequency.

[0103] According to the embodiment of the present application, the fresh air dehumidification mode is mainly handled by the fresh air humidifier for indoor dehumidification, and the operation of the air conditioner can be changed according to the changes in the indoor temperature.

[0104] The user's set indoor temperature Ts is obtained from the input unit, and the indoor return air temperature Tra is obtained from the indoor temperature and humidity detection device 440.

[0105] S105. Determine the difference between the indoor set temperature and the indoor return air temperature. When the difference is not less than the upper limit of the preset temperature value range, enter S106 and turn off the air conditioner or maintain the high sensible heat mode; when the difference is not greater than the lower limit of the preset temperature value range, enter S107 and the air conditioner exits the high sensible heat mode; when the difference is within the preset temperature value range, enter S108 and the air conditioner maintains the high sensible heat mode.

[0106] Specifically, the preset temperature range is (-2, +2). When Ts>Tra+2, it means that the indoor set temperature is significantly higher than the indoor return air temperature, and the air conditioner does not need to be cooled. It can maintain the energy-saving high sensible heat mode or be directly shut down; when Ts<Tra-2, it means that the indoor set temperature is lower than the indoor return air temperature, and the indoor temperature needs to be cooled. The air conditioner exits the high sensible heat mode and enters the normal cooling mode; when |Ts-Tra|≤2, the indoor set temperature is close to the indoor return air temperature, and the air conditioner can continue to maintain the high sensible heat mode.

[0107] According to the embodiment of the present application, after S106, S107, and S108 are executed, the process returns to S105 and re-judges the process every time interval t2.

[0108] <Common dehumidification mode>

[0109] Figure 7 A flow chart illustrating a common dehumidification mode of an air handling system according to some embodiments.

[0110] Users can directly select the common dehumidification mode based on changes in indoor humidity sources. For example, on weekends, the indoor humidity load will increase.

[0111] S200, determine whether the maximum dehumidification load of the fresh air humidifier is greater than the fresh air wet load. If so, it means that the current frequency of the fresh air humidifier can bear the fresh air wet load, and S201, maintain the current frequency; if not, it means that the fresh air humidifier cannot fully bear the fresh air wet load, and S202, increase the frequency of the fresh air humidifier to increase the dehumidification capacity.

[0112] Specifically, when Wmax>(doa-ds)·Gs1·ρ1, the fresh air humidifier maintains the current frequency; when Wmax≤(doa-ds)·Gs1·ρ1, the fresh air humidifier increases the frequency.

[0113] Among them, Wmax represents the maximum dehumidification load of the fresh air humidifier, doa represents the humidity content of the outdoor air, ds represents the set indoor humidity content, Gs1 represents the set air supply volume of the fresh air humidifier, and ρ1 represents the outdoor air density.

[0114] The maximum dehumidification load of the fresh air humidifier is related to the operating conditions and air volume. This value can be found in the performance table of the fresh air humidifier.

[0115] After the frequency of the first compressor is increased, the process returns to S200 after time t1 to re-judge. If the maximum dehumidification load of the fresh air humidifier is still not greater than the fresh air humidity load, the frequency of the first compressor is controlled to continue to increase.

[0116] S203. Under the condition of Wmax>(doa-ds)·Gs1·ρ1, determine whether dra-ds≤Wi / Gs1·ρ1+A is established. If so, proceed to S204. The air conditioner maintains the high sensible heat mode; if not, proceed to S205. The air conditioner exits the high sensible heat mode.

[0117] Among them, A is the preset correction value, dra represents the indoor return air humidity content, ds represents the indoor set humidity content, Gs1 represents the set air supply volume of the fresh air humidifier, and ρ1 represents the outdoor air density.

[0118] dra-ds≤Wi / (Gs1·ρ1)+A holds, indicating that the indoor wet load is small and within the allowable comfort range. At this time, the air conditioner can operate at high sensible heat. dra-ds≤Wi / (Gs1·ρ1)+A does not hold, that is, dra-ds>Wi / (Gs1·ρ1)+A, indicating that the indoor wet load is large and not within the allowable comfort range. At this time, the air conditioner exits the high sensible heat mode to quickly remove the indoor wet load.

[0119] S206. Under the condition of Wmax≤(doa-ds)·Gs1·ρ1, when the difference between dsa and ds is within the preset interval, the indoor relative humidity RHra is not higher than the preset humidity critical value, and dra-ds≤W i / (Gs1·ρ1)+B, proceed to S207, control the air conditioner to maintain a high sensible heat mode;

[0120] When the difference between dsa and ds is greater than the upper limit of the preset interval, and dra-ds>W i / (Gs1·ρ1)+B, S208 is performed to control the air conditioner to exit the high sensible heat mode. In addition, under this condition, the operating state of the air conditioner can be controlled, for example, the opening of the second expansion valve is adjusted so that the air conditioner operates under the preset low evaporation temperature Te. Wherein, B is the preset correction value, and dsa represents the humidity content of the fresh air supply.

[0121] Specifically, a fresh air supply humidity detection device 490 may be provided at the fresh air supply outlet of the fresh air humidifier to detect the moisture content dsa of the fresh air supply.

[0122] For example, the preset interval is [0.5, 1], the preset humidity threshold is 60%, when 0.5≤dsa-ds≤1, RHra≤60% and dra-ds≤W i / (Gs1·ρ1)+B, it means that the humidity content of the fresh air supply is higher than the set indoor humidity content, but the difference is not large, and the indoor wet load is small, which is within the allowable comfort range. At this time, the air conditioner can maintain a high sensible heat mode. Although the wet load cannot be completely removed, the comfort requirements have been met.

[0123] When dsa-ds>1 and dra-ds>W i / (Gs1·ρ1)+B, it means that the humidity content of the fresh air supply is higher than the set indoor humidity content, and the difference is large. At the same time, the indoor humidity load is large and is not within the allowable comfort range. At this time, the air conditioner exits the high sensible heat mode and operates under Te≤7℃ (low evaporating temperature) to quickly remove the humidity load.

[0124] <Automatic dehumidification mode>

[0125] Figure 8A flow chart illustrating an automatic dehumidification mode of an air handling system according to some embodiments.

[0126] S300. Calculate the total indoor humidity load when the fresh air humidifier operates in dehumidification mode and the air conditioner operates in high sensible heat mode.

[0127] Total indoor humidity load = fresh air humidity load Wx1 + indoor humidity load Wi

[0128] The new rheumatic load Wx1 is calculated according to the following formula:

[0129] Wx1=Gs1·ρ1·(doa-ds)

[0130] Indoor moisture load Wi = moisture dissipation from human body + moisture dissipation from plants + moisture dissipation from clothes drying + moisture dissipation from kitchen + moisture dissipation from bathroom.

[0131] Gs1 represents the set air supply volume of the fresh air humidifier, ρ1 represents the outdoor air density, doa represents the humidity content of the outdoor air, and ds represents the set indoor humidity content.

[0132] S301: Determine whether the difference between the maximum dehumidification load of the humidifier and the preset correction value is not less than the total indoor humidity load, that is, Wmax-θ≥W i +Gs1·ρ1·(doa-ds) is established. If so, proceed to S302, fresh air dehumidification mode; if not, proceed to S303, common dehumidification mode.

[0133] Where θ represents the preset correction value, Wmax-θ≥W i +Gs1·ρ1·(doa-ds) holds true, indicating that the fresh air humidifier can bear the fresh air and indoor humidity load, and the user's indoor humidity requirements can be met by the fresh air humidifier alone; Wmax-θ≥W i +Gs1·ρ1·(doa-ds) is not true, which means that the fresh air humidifier cannot bear the fresh air and indoor humidity load, and the fresh air humidifier and air conditioner are needed to dehumidify together.

[0134] When the difference between indoor and outdoor humidity is not large and the indoor wet load is relatively stable, users can choose the fresh air dehumidification mode to achieve energy saving while ensuring appropriate indoor humidity. When the difference between indoor and outdoor humidity is large or the indoor wet load is unstable, users can choose the common dehumidification mode, or users can choose the automatic dehumidification mode, and the system will automatically determine which dehumidification mode to enter.

[0135] According to the present application, the change of indoor humidity is predicted in advance by the change of indoor wet load, so that the system can dehumidify in advance and avoid the subsequent change of indoor humidity.

[0136] According to the present application, by converting the indoor load into the target supply air humidity content, which can reflect the precise changes in indoor humidity in the future, the system operation can be controlled according to the supply air humidity content, making the system operation more precise.

[0137] According to this application, the system has the ability to automatically determine the dehumidification mode: by determining whether the dehumidification capacity of the fresh air humidifier can bear the indoor and fresh air humidity loads, the fresh air dehumidification mode is implemented when it can bear the load, and the common dehumidification mode is implemented when it cannot bear the load, which is more energy-efficient while ensuring the dehumidification speed.

[0138] According to this application, the system can realize fresh air dehumidification mode, common dehumidification mode and automatic dehumidification mode, meeting the diverse needs of users.

[0139] The terms "comprising", "having", etc. are used to specify features, numbers, steps, operations, elements, components, or a combination of features, numbers, steps, operations, elements and components, but do not exclude the existence or addition of one or more of the features, elements, steps, operations, elements, components, or the combination of features, numbers, steps, operations, elements and components.

[0140] Terms such as "unit", "part", "block", "member" and "module" indicate a unit for processing at least one function or operation. For example, these terms may refer to at least one process processed by at least one hardware (such as a field programmable gate array (FPGA), an application specific integrated circuit (ASIC)), at least one software stored in a memory or a processor.

[0141] The identification codes are used for convenience of description, but are not intended to indicate the order of each step. Unless the context clearly indicates otherwise, each step can be implemented in an order different from the order shown.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0143] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A control method for an air handling system, characterized in that: The air treatment system comprises: a fresh air humidifier; The fresh air humidifier comprises: Fresh air duct and exhaust air duct; An adsorption component is arranged in the fresh air duct and the exhaust air duct, and when the fresh air humidifier is in dehumidification operation, the adsorption component absorbs moisture from the fresh air in the fresh air duct; A refrigeration system, comprising a refrigerant circuit formed by a first compressor, a first four-way valve, a second heat exchanger, a first expansion valve and a first heat exchanger; the first heat exchanger is arranged in the fresh air duct, and the second heat exchanger is arranged in the exhaust air duct; The control method comprises: In the fresh air dehumidification mode, the target supply air humidity content is calculated based on the indoor set humidity content and the indoor humidity load generated by the indoor humidity source; The difference between the target air supply humidity content and the initial target air supply humidity content is determined. When the difference is greater than the upper limit of the preset allowable humidity range, the frequency of the first compressor is controlled to be reduced; when the difference is less than the lower limit of the preset allowable humidity range, the frequency of the first compressor is controlled to be increased.

2. The control method of the air treatment system according to claim 1, characterized in that: Calculate the target air supply humidity content DSA based on the indoor humidity setting and the indoor humidity load generated by the indoor humidity source i The specific formula is: dsa i =ds-W i / (Gs1·ρ1); Where, ds represents the indoor set humidity content, W i represents the indoor wet load, Gs1 represents the set air supply volume of the fresh air humidifier; ρ1 represents the density of outdoor air.

3. The control method of the air treatment system according to claim 1, characterized in that: The air treatment system further comprises: air conditioner; A controller, used to receive information transmitted by the air conditioner and the fresh air humidifier, and control the operation of the air conditioner and the fresh air humidifier; The control method comprises: The total indoor wet load is obtained according to the indoor wet load and the fresh air wet load; Determine whether the difference between the maximum dehumidification load of the fresh air humidifier and the preset allowable value is not less than the total indoor humidity load. If so, the fresh air dehumidification mode is implemented; if not, the joint dehumidification mode of the fresh air humidifier and the air conditioner is implemented.

4. The control method of the air treatment system according to claim 3, characterized in that: The calculation formula of the new rheumatic load Wx1 is: Wx1=Gs1·ρ1·(doa-ds); Among them, ds represents the set indoor humidity content; doa represents the outdoor air humidity content; Gs1 represents the set air supply volume of the fresh air humidifier; ρ1 represents the density of the outdoor air.

5. The control method of the air treatment system according to claim 3, characterized in that: Also includes: In the fresh air dehumidification mode, the air conditioner operates in high sensible heat mode; Determine the difference between the indoor set temperature and the indoor return air temperature, and when the difference is greater than the upper limit of the preset temperature range, control the air conditioner to maintain the high sensible heat mode or shut down; When the difference is less than the lower limit of the preset temperature range, the air conditioner is controlled to exit the high sensible heat mode.

6. The control method of the air treatment system according to claim 3, characterized in that: Also includes: In the common dehumidification mode, it is determined whether the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidification load. If so, the fresh air humidifier maintains the current state; If not, the first compressor is increased in frequency.

7. The control method of the air treatment system according to claim 3, characterized in that: Also includes: In the common dehumidification mode, when the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidity load, it is judged that dra-ds≤W i / (Gs1·ρ1)+A is true, if so, the air conditioner is controlled to maintain the high sensible heat mode; if not, the air conditioner is controlled to exit the high sensible heat mode; Under the condition that the maximum dehumidification load of the fresh air humidifier is not greater than the fresh air humidity load, when the difference between dsa and ds is within the preset range, the indoor relative humidity is not higher than the preset humidity critical value, and dra-ds≤W i / (Gs1·ρ1)+B, the air conditioner is controlled to maintain high sensible heat mode; when the difference between dsa and ds is greater than the upper limit of the preset interval, and dra-ds>W i / (Gs1·ρ1)+B, the air conditioner is controlled to exit the high sensible heat mode; Among them, dsa represents the humidity content of fresh air supply; ds represents the set humidity content of indoor air; dra represents the humidity content of indoor return air; W i represents the indoor wet load; Gs1 represents the set air supply volume of the fresh air humidifier; ρ1 represents the density of outdoor air.

8. The control method of the air treatment system according to claim 7, characterized in that: When the difference between dsa and ds is greater than the upper limit of the preset interval, and dra-ds>W i / (Gs1·ρ1)+B, the air conditioner is controlled to exit the high sensible heat mode and to operate below the preset low evaporating temperature.

9. The control method of the air treatment system according to claim 1, characterized in that: The indoor moisture load includes at least one of moisture dissipation from human bodies, plants, clothes drying, kitchens, and bathrooms.

10. An air treatment system, characterized in that: include: Fresh air humidifier and air conditioner; The fresh air humidifier comprises: Fresh air duct and exhaust air duct; An adsorption component is arranged in the fresh air duct and the exhaust air duct, and when the fresh air humidifier is in dehumidification operation, the adsorption component absorbs moisture from the fresh air in the fresh air duct; A refrigeration system, comprising a refrigerant circuit formed by a first compressor, a first four-way valve, a second heat exchanger, a first expansion valve and a first heat exchanger; the first heat exchanger is arranged in the fresh air duct, and the second heat exchanger is arranged in the exhaust air duct; The air treatment system further comprises: Controller for: In the fresh air dehumidification mode, the air conditioner operates in a high sensible heat mode; Calculate the target air supply humidity content based on the indoor set humidity content and the indoor humidity load generated by the indoor humidity source; The difference between the target air supply humidity content and the initial target air supply humidity content is determined. When the difference is greater than the upper limit of the preset allowable humidity range, the frequency of the first compressor is controlled to be reduced; when the difference is less than the lower limit of the preset allowable humidity range, the frequency of the first compressor is controlled to be increased.

Images