Air handling system and method of controlling the same

Abstract

The application 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 and dehumidifying machine; the fresh air humidifying and dehumidifying machine comprises a fresh air duct and an exhaust air duct; an adsorption assembly is arranged in the fresh air duct and the exhaust air duct; a refrigeration system comprises 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 method comprises the following steps: in a fresh air dehumidifying mode, a target supply air humidity content is calculated according to an indoor set humidity content and an indoor humidity load generated by an indoor humidity source; a difference between the target supply air humidity content and an initial target supply air humidity content is judged; when the difference is greater than an upper limit value of a preset humidity range, the first compressor is controlled to reduce the frequency; and when the difference is less than a lower limit value of the preset humidity range, the first compressor is controlled to increase the frequency. The air treatment system can quickly respond to the humidity load.

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] At present, the dehumidification device for indoor air mainly includes fresh air humidifying and dehumidifying machines and air conditioners. The fresh air humidifying and dehumidifying machine is a device for introducing fresh air with a humidified state into a room, and the fresh air humidifying and dehumidifying machine adjusts indoor air by sending fresh air with a suitable humidity into the room. The air conditioner is a device for adjusting the temperature and humidity of indoor air, and the air conditioner discharges cooling air obtained through a refrigeration cycle to an indoor space, and the refrigeration cycle usually consists of processes of compression, condensation, expansion and evaporation of refrigerant, or the air conditioner discharges heating air obtained through reverse processes to the indoor space, so as to adjust the indoor air.

[0003] These devices are usually controlled according to the deviation of the humidity of the indoor environment from the set humidity of the room, however, due to the continuous change of the indoor humidity load, for example, the sudden increase of the number of people, the cooking of the user, the laundry, etc., which cannot be timely fed back to the detection of the indoor humidity, resulting in the lag of the dehumidification operation. SUMMARY

[0004] The present application provides an air treatment system and a control method, which can quickly respond to the humidity load.

[0005] In one aspect of the present application, a control method of an air treatment system, wherein the air treatment system comprises a fresh air humidifying and dehumidifying machine; the fresh air humidifying and dehumidifying machine comprises a fresh air duct and an exhaust air duct; an adsorption assembly is arranged in the fresh air duct and the exhaust air duct, and absorbs the moisture of fresh air in the fresh air duct when the fresh air humidifying and dehumidifying machine is in a dehumidification operation; a refrigeration system comprises 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 a fresh air dehumidification mode, calculating a target supply air humidity content according to a set indoor humidity content and an indoor humidity load generated by an indoor humidity source; judging the difference between the target supply air humidity content and an initial target supply air humidity content, controlling the first compressor to reduce the frequency when the difference is greater than the upper limit value of a preset humidity allowance interval; and controlling the first compressor to increase the frequency when the difference is less than the lower limit value of the preset humidity allowance interval.

[0006] In some embodiments, the target supply air humidity content dsa i is calculated according to the set indoor humidity content and the indoor humidity load generated by the indoor humidity source.

[0007] dsa i = ds - W i / (Gs1·p1).

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

[0009] In some embodiments, the air handling system further comprises: an air conditioner; a controller configured to receive information transmitted by the air conditioner and the fresh air humidifier and control operation of the air conditioner and the fresh air humidifier.

[0010] The control method comprises:

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

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

[0013] In some embodiments, the calculation formula of the fresh air humidity load Wx1 is:

[0014] Wx1=Gsl·ρ1·(doa-ds);

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

[0016] In some embodiments, the air conditioner runs in a high sensible heat mode in the fresh air dehumidification mode.

[0017] It is determined whether the difference between the indoor set temperature and the indoor return air temperature, and when the difference is greater than the upper limit value of the preset temperature interval, the air conditioner is controlled to maintain the high sensible heat mode or be turned off; and when the difference is less than the lower limit value of the preset temperature interval, the air conditioner is controlled to exit the high sensible heat mode.

[0018] In some embodiments, in the common dehumidification mode, it is determined whether the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidity load, and if so, the fresh air humidifier maintains the current state; and if not, the first compressor is frequency-increased.

[0019] In some embodiments, 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 determined whether dra-ds≤W i / (Gs1·ρ1)+A is established, and if so, the air conditioner is controlled to maintain the high sensible heat mode; and 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 a preset interval, the indoor relative humidity is not higher than a preset humidity critical value, and dra-ds≤Wi when the difference between dsa and ds is greater than an upper limit of the preset interval and dra-ds > W i when the difference between dsa and ds is greater than an upper limit of the preset interval and dra-ds > W

[0021] wherein dsa represents the fresh air supply humidity content; ds represents the indoor set humidity content; dra represents the indoor return air humidity content; W i represents the indoor humidity load; Gs1 represents the set supply air volume of the fresh air humidifier; p1 represents the density of outdoor air; and C represents a preset value.

[0022] In some embodiments, when the difference between dsa and ds is greater than an upper limit of the preset interval and dra-ds > W i when the difference between dsa and ds is greater than an upper limit of the preset interval and dra-ds > W

[0023] In some embodiments, the indoor humidity load includes at least one of human body moisture, plant moisture, laundry moisture, kitchen moisture, and bathroom moisture.

[0024] In another aspect of the present application, an air handling 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 assembly is arranged in the fresh air duct and the exhaust air duct, and absorbs moisture of 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 handling system further includes a controller configured to:

[0025] in a fresh air dehumidification mode, the air conditioner is operated in a high sensible heat mode;

[0026] calculating a target supply air humidity content according to the indoor set humidity content and the indoor humidity load generated by the indoor humidity source;

[0027] judging a 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 an upper limit of a preset humidity allowance interval, and controlling the first compressor to increase the frequency when the difference is less than a lower limit of the preset humidity allowance interval. BRIEF DESCRIPTION OF DRAWINGS

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

[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 of 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 of a refrigeration system in an air conditioner of an air handling system according to some embodiments is shown;

[0032] Figure 5 A signal control block diagram of an air handling system according to some embodiments is shown;

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

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

[0035] Figure 8 A flow chart of an automatic 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 runner; 340, fresh air supply 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, human body detection device; 460, clothing moisture 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 of the present application more clear, the following will clearly and completely describe the exemplary implementation of the present application in combination with the drawings of the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0040] The following will describe in detail the embodiments of the present application with reference to the embodiments of the present application, and the examples of the embodiments of the present application are shown in the drawings.

[0041] With reference to Figure 1 The air treatment system 100 of the embodiments of the present application comprises an air conditioner 200 and a fresh air humidifier 300.

[0042] The fresh air humidifier 300 generally adopts a combination of an adsorption assembly made of adsorption material and a refrigeration system to adjust the sensible and latent heat load of fresh air. The working principle is mainly to adjust the adsorption inlet temperature through the evaporator of the refrigeration system, and the condenser of the refrigeration system to discharge 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, and the other is a wind channel switching structure, the adsorption assembly is fixed, and the fresh air channel and the exhaust air channel 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] With reference to Figure 2 The fresh air humidifier 300 comprises a fresh air channel 310 and an exhaust air channel 320, the fresh air channel 310 is used to send outdoor fresh air into the room, and the exhaust air channel 320 is used to exhaust indoor air to the outdoor.

[0046] Part of the adsorption rotary wheel 330 is located in the fresh air channel 310, and the other part is located in the exhaust air channel 320.

[0047] The fresh air fan 340 is arranged in the fresh air channel 310 and is used to drive outdoor fresh air to be sent into the room along the fresh air channel 310.

[0048] The indoor exhaust fan 350 is arranged in the exhaust air channel 320 and is used to drive indoor air to be exhausted to the outdoor along the exhaust air channel 320.

[0049] The first heat exchanger 360 is arranged in the fresh air channel 310 and located at the windward side of the adsorption rotary wheel 330. The second heat exchanger 370 is arranged in the exhaust air channel 320 and located at the windward side of the adsorption rotary 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, and has the following components on the refrigeration system: 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 the 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; and the second heat exchanger 370 is a condenser for heating the 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 the exhaust air is reduced, and the adsorption wheel 330 absorbs moisture in the exhaust air; and the first heat exchanger 360 is a condenser for heating the fresh air, so that the adsorption wheel 330 absorbs moisture and is separated, and thus the fresh air is humidified.

[0052] The structure of the air conditioner is briefly described as follows:

[0053] Referring 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 air conditioner having multiple units for application in places such as shopping malls, office buildings, and factories.

[0055] In other embodiments, the air conditioner 200 can also be an all-in-one machine, i.e., the outdoor unit 210 and the indoor unit 220 are integrated on one housing. The all-in-one machine is 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 includes a refrigeration system, which is combined Figure 4The 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 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 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] With reference 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 (for example, a cache, a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), and a flash memory), a volatile memory (for example, 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 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 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, and the local communication 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, and can include a button-type switch, a film 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 and the indoor set temperature Ts from the user.

[0064] The indoor temperature and humidity detection device 440 can be provided at a return air inlet of the indoor unit 220 or at a return air inlet of the fresh air dehumidifier 300, and can detect the indoor return air humidity dra, the indoor return air temperature Tra, and the indoor relative humidity RHra of the indoor space.

[0065] The human body detection device 450 can detect the number of people, the motion state, etc. in the indoor room. The human body detection sensor 450 can be an infrared camera, and can be provided at the top of the room or at the door of the room.

[0066] The outdoor humidity detection device 450 can be provided at a fresh air inlet of the fresh air dehumidifier 300, and can detect the outdoor air humidity doa.

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

[0068] In the case where the air conditioner operates in the high sensible heat mode, it is explained that the indoor temperature and humidity are appropriate, and the fresh air dehumidifier operates in the dehumidification mode, and the fresh air is dehumidified and then supplied into the indoor room, and the fresh air does not cause a large change in the indoor temperature and humidity. However, when the indoor moisture load suddenly changes, it is necessary to change the operation of the fresh air dehumidifier and the air conditioner.

[0069] In some embodiments of the present application, a fresh air dehumidification mode in which the fresh air dehumidifier mainly dehumidifies, and a common dehumidification mode in which the fresh air dehumidifier and the air conditioner dehumidify together can be implemented.

[0070] <Fresh air dehumidification mode>

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

[0072] S100, calculate indoor moisture load generated by indoor moisture sources, and calculate target supply air moisture content according to the indoor moisture load.

[0073] The indoor moisture load generated by indoor moisture sources includes at least one of human body moisture emission, moisture emission of various wet surfaces of non-enclosure structures, moisture emission of liquid surfaces or liquid flows (in a bathroom), moisture emission of food or gas materials (in a kitchen), etc. It is considered that sudden changes in indoor moisture load may be caused by personnel gathering on weekends, family gatherings, laundry drying, and new plants in a home environment.

[0074] The indoor moisture load generated by indoor moisture sources includes at least one of human body moisture emission, plant moisture emission, laundry moisture emission, kitchen moisture emission, and bathroom moisture emission.

[0075] Exemplarily, an implementation of human body moisture emission calculation is shown as follows:

[0076] The single-person moisture emission data is pre-stored in the memory 410 and can be obtained according to experimental data. The human body detection device 450 can detect the number of persons, and thus the human body moisture emission can be obtained by multiplying the number of persons by the single-person moisture emission.

[0077] In other embodiments, the single-person moisture emission data can also be associated with the state of the person, for example, the single-person moisture emission of static persons and the single-person moisture emission of dynamic persons can be obtained through a large amount of experimental data. After the system receives the state of the human body and the number of persons detected by the human body detection device 450, the corresponding data can be found to obtain the human body moisture emission.

[0078] Exemplarily, an implementation of plant moisture emission calculation is shown as follows:

[0079] When more plants are suddenly put into the room or plants are removed, the indoor moisture load will be affected. Therefore, the plant moisture emission can be calculated into the indoor moisture load.

[0080] The moisture emission data of different types of plants is stored in the memory 410, and the system receives the type and number of plants input by the user in the input unit 430, and then finds the moisture emission data of the corresponding plant type to obtain the plant moisture emission by multiplying the number of plants by the found data.

[0081] Exemplarily, an implementation of laundry moisture emission calculation is shown as follows:

[0082] When laundry is dried in the room, the moisture emission of the laundry will also affect the indoor moisture load, and thus the laundry moisture emission can be calculated into the indoor moisture load.

[0083] The air handling system can include a clothes moisture measuring device 460, which can be arranged on a clothes hanger or a washing machine. The clothes moisture measuring device 460 can obtain the moisture of the clothes, and then convert the moisture of the clothes into the moisture load of the clothes. Since the conversion of the moisture into the moisture load is a prior art, it is not described herein.

[0084] Exemplarily, the implementation of the kitchen moisture emission amount calculation is as follows:

[0085] Since the kitchen moisture source emits moisture to the target room (living room, bedroom, etc.), thereby affecting the moisture load of the target room, the kitchen moisture emission amount of the food and the electric appliance can be calculated into the indoor moisture load.

[0086] The air handling system can include a kitchen humidity sensor 470, which can detect the humidity of the kitchen, and then convert the humidity of the kitchen into the kitchen moisture load.

[0087] Exemplarily, the implementation of the bathroom moisture emission amount calculation is as follows:

[0088] When the user takes a bath in the bathroom, the bathroom emits moisture to the target room (living room, bedroom, etc.), thereby affecting the moisture load of the target room, and thus the bathroom moisture source can be calculated into the indoor moisture load.

[0089] The air handling system can include a bathroom humidity sensor 480, which can detect the humidity of the bathroom, and then convert the humidity of the bathroom into the bathroom moisture load.

[0090] The controller receives the data fed back by the human body detection device 450, the plant information, the data fed back by the clothes moisture measuring 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 according to the data and substitutes into the corresponding formula to calculate the indoor moisture load W i = human body moisture emission amount + plant moisture emission amount + clothes moisture emission amount + kitchen moisture emission amount + bathroom moisture emission amount.

[0091] Since the human body moisture emission amount accounts for a large proportion in the indoor moisture load, in some embodiments, the indoor moisture load can only calculate the human body moisture emission amount, and ignore other moisture sources.

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

[0093] dsa i = ds - W i / (Gs1·p1)

[0094] Wherein, ds represents the indoor set moisture content, and W​i represents the indoor wet load, Gs1 represents the set supply air volume of the fresh air humidifier, and p1 represents the outdoor air density.

[0095] Since the indoor wet load changes, the target supply air humidity will change. In the present application, the target supply air humidity can be calculated in real time or calculated according to a preset period, for example, the preset period is five minutes, and the target supply air humidity is calculated every five minutes.

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

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

[0098] In the related art, the comparison between the indoor return air humidity and the indoor set humidity is usually used to control the dehumidification operation of the system. However, since the indoor wet load feedback to the indoor humidity needs a certain time, for example, the sudden increase of indoor personnel will not immediately cause the change of indoor humidity, but slowly releases humidity into the air, which will lead to the lag of dehumidification response.

[0099] The present application predicts the change of indoor humidity in advance through the change of indoor wet load, for example, the sudden increase of indoor personnel will cause the change of indoor wet load, at this time, the dehumidification response is carried out in advance, and the system carries out the dehumidification response while the human body releases humidity into the room, which can avoid the subsequent change of indoor humidity.

[0100] In addition, if the indoor wet load is directly used to control the system operation, the response may not be accurate enough. For example, the indoor wet load increases due to an increase in the number of indoor personnel, but the increased wet load may not cause a large change in the indoor humidity. In this case, the indoor humidity may only fluctuate a little due to the increased wet load, and the system can maintain the indoor humidity by maintaining the current dehumidification, without the need to increase the frequency of dehumidification.

[0101] In the present application, the indoor wet load is converted into the target supply air moisture content, which can reflect the accurate change of the future indoor humidity. Therefore, the system operation can be more accurate according to the supply air moisture content.

[0102] In the present application, when the first compressor is increased in frequency, the difference is re-judged after t1 time returns to S101. When the difference is still not less than the lower limit value of the preset humidity range, the first compressor is controlled to continue to increase in frequency. Similarly, when the first compressor is decreased in frequency, the difference is re-judged after t1 time returns to S101. When the difference is still not less than the upper limit value of the preset humidity range, the first compressor is controlled to continue to decrease in frequency.

[0103] According to the embodiments of the present application, the fresh air dehumidification mode is mainly used by the fresh air dehumidification machine to dehumidify the indoor air, and the operation of the air conditioner can be changed according to the change of the indoor temperature.

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

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

[0106] Specifically, the preset temperature range is (-2, +2). When Ts>Tra+2, it indicates that the indoor set temperature is significantly higher than the indoor return air temperature, and the air conditioner does not need to cool, and can maintain the energy-saving high sensible heat mode, or be directly turned off; when Ts

[0107] According to the embodiments of the present application, S106, S107, S108 are run every t2 time, and S105 is returned to re-judge once.

[0108] <Common dehumidification mode>

[0109] Figure 7 A flow chart of the common dehumidification mode of the air handling system according to some embodiments is shown.

[0110] The user can directly select the common dehumidification mode according to the change of the indoor humidity source, for example, the indoor humidity load will increase on weekends.

[0111] S200, determine whether the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidity load, if yes, it means that the frequency of the fresh air humidifier can bear the fresh air humidity load, proceed to S201, maintain the current frequency; if not, it means that the fresh air humidifier cannot fully bear the fresh air humidity load, proceed to S202, the fresh air humidifier increases the frequency 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] Wherein, Wmax represents the maximum dehumidification load of the fresh air humidifier, doa represents the moisture content of outdoor air, ds represents the indoor set humidity content, Gs1 represents the set supply air 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 working condition and the air volume, which can be obtained from the performance table of the fresh air humidifier.

[0115] When the first compressor increases the frequency, return to S200 after t1 time to re-determine, if the maximum dehumidification load of the fresh air humidifier is still not greater than the fresh air humidity load, the first compressor continues to increase the frequency.

[0116] S203, under the condition of Wmax>(doa-ds)·Gs1·ρ1, determine whether dra-ds≤Wi / Gs1·ρ1+A is true, if yes, 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] Wherein, A is a preset correction value, dra represents the indoor return air humidity content, ds represents the indoor set humidity content, Gs1 represents the set supply air volume of the fresh air humidifier, and ρ1 represents the outdoor air density.

[0118] If dra-ds≤Wi / (Gs1·ρ1)+A holds true, it means that the indoor moisture load is small and within the allowable comfort range. In this case, the air conditioner can operate in high sensible heat mode. If dra-ds≤Wi / (Gs1·ρ1)+A does not hold true, that is, dra-ds>Wi / (Gs1·ρ1)+A, it means that the indoor moisture load is large and outside the allowable comfort range. In this case, the air conditioner should exit the high sensible heat mode in order to quickly remove the indoor moisture load.

[0119] S206. Under the condition that Wmax≤(doa-ds)·Gs1·ρ1, when the difference between dsa and ds is within a preset range, the indoor relative humidity RHra is not higher than the preset humidity threshold, and dra-ds≤W i When / (Gs1·ρ1)+B, perform S207 and control the air conditioner to maintain the 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 When / (Gs1·ρ1)+B, S208 is executed, controlling the air conditioner to exit the high sensible heat mode. Additionally, under this condition, the operating status of the air conditioner can be controlled, for example, by adjusting the opening of the second expansion valve, so that the air conditioner operates at a preset low evaporation temperature Te. Here, B is a preset correction value, and dsa represents the moisture content of the fresh air supply.

[0121] Specifically, a fresh air humidity detection device 490 can be installed at the fresh air outlet of the fresh air dehumidifier to detect the moisture content dsa of the fresh air.

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

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

[0124] Automatic Dehumidification Mode

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

[0126] S300, calculate the total indoor humidity load under the condition that the fresh air humidifier runs in the dehumidification mode and the air conditioner runs in the high sensible heat mode.

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

[0128] The fresh air humidity load Wx1 is calculated according to the following formula:

[0129] Wx1 = Gs1 * p1 * (doa-ds)

[0130] The indoor humidity load Wi = human body humidity emission + plant humidity emission + laundry humidity emission + kitchen humidity emission + bathroom humidity emission.

[0131] Gs1 represents the set air supply of the fresh air humidifier, p1 represents the outdoor air density, doa represents the moisture content of outdoor air, and ds represents the indoor set moisture 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, i.e. Wmax-0 >= W i + Gs1 * p1 * (doa-ds) is true, then proceed to S302, fresh air dehumidification mode; if not, proceed to S303, common dehumidification mode.

[0133] Wherein, 0 represents the preset correction value, Wmax-0 >= W i + Gs1 * p1 * (doa-ds) is true, which means that the fresh air humidifier can bear the fresh air and indoor humidity load, and only relying on the fresh air humidifier dehumidification can meet the user's requirements for indoor humidity; Wmax-0 >= W i + Gs1 * p1 * (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 the air conditioner need to dehumidify together.

[0134] When the indoor and outdoor humidity difference is not large and the indoor humidity load is stable, the user can select the fresh air dehumidification mode to achieve the purpose of energy saving under the premise of meeting the indoor humidity suitable, when the indoor and outdoor humidity difference is large or the indoor humidity load is unstable, the user can select the common dehumidification mode, or the user can select the automatic dehumidification mode, and the system automatically determines the dehumidification mode.

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

[0136] According to the present application, the indoor load is converted into the target supply air humidity content, and the target supply air humidity content can reflect the accurate change of the future indoor humidity, so that the system operation is controlled according to the supply air humidity content, and the system operation is more accurate.

[0137] According to the present application, the system has the ability to automatically determine the dehumidification mode: by judging whether the dehumidification capacity of the fresh air humidifier can bear the indoor and fresh air humidity load, the fresh air dehumidification mode is performed when it can bear, and the common dehumidification mode is performed when it cannot bear, which is more energy-saving under the premise of ensuring the dehumidification speed.

[0138] According to the present application, the system can realize the fresh air dehumidification mode, the common dehumidification mode and the automatic dehumidification mode, and meet the diversified needs of users.

[0139] The terms "comprise", "have" and the like 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 of the features, elements, steps, operations, elements, components or combinations of features, numbers, steps, operations, elements and components.

[0140] The terms such as "unit", "part", "block", "member" and "module" indicate a unit for processing at least one function or operation. For example, these terms can refer to at least one process handled 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 code is used for convenience of description, but is 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 that shown.

[0142] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0143] For the sake of explanation, the foregoing descriptions have been presented in terms of specific embodiments. However, it is to be appreciated that specific embodiments described herein are not intended to limit the scope of the present application, which is defined with reference to the following claims. Various modifications and changes can be made thereto by those skilled in the art which fall within the scope of the present application as defined by the following claims. The embodiments were chosen and described in order to explain the principles of the application and the practical application and to enable others skilled in the art to understand for implementing various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. A control method of an air handling system, characterized by, The air treatment system comprises an air conditioner and a fresh air humidifier; The fresh air humidifier comprises: a fresh air duct and an exhaust air duct; an adsorption assembly arranged in the fresh air duct and the exhaust air duct, which absorbs moisture in fresh air in the fresh air duct when the fresh air humidifier is in dehumidification operation; 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, 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 value of the preset humidity range; and controlling the first compressor to increase the frequency when the difference is less than the lower limit value of the preset humidity range; Target supply air moisture content DSA i The specific formula is: dsa i = ds- w i / (Gs1 p1); wherein ds represents the indoor set humidity content, W i represents the indoor humidity load, Gs1 represents the set supply air volume of the fresh air humidity controller; and p1 represents the density of the outdoor air. The control method further comprises: obtaining the total indoor humidity load according to the indoor humidity load and the fresh air humidity load; judging 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, and if yes, performing the fresh air dehumidification mode; and if not, performing the common dehumidification mode of the fresh air humidifier and the air conditioner.

2. The control method of an air handling system according to claim 1, wherein, The air treatment system further comprises: 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.

3. The control method of an air handling system according to claim 1, wherein, The calculation formula of the fresh air humidity load Wx1 is: Wx1=Gs1·ρ1· (doa-ds); wherein, ds represents the indoor set humidity content; doa represents the outdoor air humidity content; Gs1 represents the set supply air volume of the fresh air humidifier; and ρ1 represents the density of outdoor air.

4. The control method of an air handling system according to claim 1, wherein, Further comprising: in the fresh air dehumidification mode, the air conditioner operates in high sensible heat mode; judging the difference between the indoor set temperature and the indoor return air temperature, and controlling the air conditioner to maintain the high sensible heat mode or shut down when the difference is greater than the upper limit value of the preset temperature range; controlling the air conditioner to exit the high sensible heat mode when the difference is less than the lower limit value of the preset temperature range.

5. The control method of an air handling system according to claim 1, wherein, Further comprising: in the common dehumidification mode, judging whether the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidity load, and if yes, the fresh air humidifier maintains the current state; if not, the first compressor increases the frequency.

6. The control method of an air handling system according to claim 1, wherein, Further comprising: In the common dehumidification mode, under the condition that the maximum dehumidification load of the fresh air humidifier is greater than the fresh air humidification load, whether drads≤W is determined i whether (Gs1·p1)+A is established, if yes, the air conditioner is controlled to keep the high sensible heat mode; if no, 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 the dsa and the ds is located in the preset interval, the indoor relative humidity is not higher than the preset humidity critical value, and the dra-ds≤W i / (Gs1*P1) + B, the air conditioner is controlled to remain in the high sensible heat mode; when the difference between the dsa and the ds is greater than the upper limit value of the preset interval, and the dra-ds>W i / (Gs1*P1) + B, the air conditioner is controlled to exit the high sensible heat mode. wherein dsa represents the supply air humidity ratio of the fresh air; ds represents the set humidity ratio in the room; dra represents the return air humidity ratio in the room; W i represents the indoor moisture load; Gs1 represents the set supply air volume of the fresh air humidifier; and p1 represents the density of the outdoor air.

7. The control method of an air handling system according to claim 6, wherein, When the difference between the dsa and the ds is greater than the upper limit value of the preset interval, and dra-ds>W i when (Gsl*pl)+B, the air conditioner is controlled to exit the high sensible heat mode, and the air conditioner is controlled to operate below the preset low evaporation temperature.

8. The control method of an air handling system according to claim 1, wherein, The indoor humidity load comprises at least one of human body moisture emission, plant moisture emission, clothes drying moisture emission, kitchen moisture emission and bathroom moisture emission.

9. An air handling system characterized by, Comprising: a fresh air humidifier and an air conditioner; The fresh air humidifier comprises: a fresh air duct and an exhaust air duct; an adsorption assembly arranged in the fresh air duct and the exhaust air duct, which absorbs moisture in fresh air in the fresh air duct when the fresh air humidifier is in dehumidification operation; 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: a controller for: in the fresh air dehumidification mode, the air conditioner operates in high sensible heat mode; According to the indoor humidity content and the indoor humidity load generated by the indoor humidity source, a target supply air humidity content is calculated; A difference between the target supply air humidity content and an initial target supply air humidity content is determined, and when the difference is greater than an upper limit value of a preset humidity range, the first compressor is controlled to reduce the frequency; and when the difference is less than a lower limit value of the preset humidity range, the first compressor is controlled to increase the frequency; Target supply air moisture content DSA i The specific formula is: dsa i = ds- w i / (Gs1- p1); wherein ds represents the indoor set humidity content, W i represents the indoor humidity load, Gs1 represents the set supply air volume of the outdoor air adjusting device; and p1 represents the density of the outdoor air. The controller is further configured to obtain an indoor total humidity load according to the indoor humidity load and the fresh air humidity load; It is determined whether a difference between a maximum dehumidification load of the fresh air dehumidifier and a preset allowable value is not less than the indoor total humidity load, and if yes, the fresh air dehumidification mode is performed; and if not, the joint dehumidification mode of the fresh air dehumidifier and the air conditioner is performed.

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