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 an air conditioner and a fresh air machine. The control method comprises the following steps: collecting and processing data of a set temperature, a wall surface average temperature and consumed power in a recent period of time so as to obtain a relationship between the wall surface average temperature and the consumed power at the same set temperature and obtain the average consumed power; calculating the change rate of the consumed power relative to the average consumed power according to the wall surface average temperature at the current moment and the set temperature; judging whether the change rate of the consumed power is not less than a preset change rate, and if so, entering an energy-saving mode; otherwise, keeping the current state. On the premise that the necessary air supply amount is guaranteed, the energy-saving effect can be achieved.

Description

TECHNICAL FIELD

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

[0002] With the vigorous promotion of near zero energy consumption buildings, the load of the building itself is significantly reduced, and the air tightness of the building is improved, so that new air equipment must be used in near zero energy consumption buildings. Due to the fact that the load of the building itself is getting smaller and smaller, the proportion of new air load is getting larger and larger, and the large new air load will cause the problem of high system air conditioning energy consumption. SUMMARY

[0003] The present application provides an air treatment system and a control method thereof, which can achieve energy saving effect under the premise of ensuring necessary air supply.

[0004] In one aspect of the present application, a control method of an air treatment system, the air treatment system comprising an air conditioner and a fresh air machine, the control method comprising:

[0005] Processing data: collecting and processing data of set temperature, wall surface average temperature and power consumption in a period of time to obtain the relationship between wall surface average temperature and power consumption under the same set temperature, and to obtain average power consumption;

[0006] Calculating power change rate: calculating the change rate of power consumption relative to average power consumption according to the wall surface average temperature and the set temperature at the current time;

[0007] Energy saving judgment: judging whether the change rate of power consumption is not less than a preset change rate, if yes, entering energy saving mode; if not, maintaining the current state.

[0008] In some embodiments, in the energy saving mode, it is judged whether the indoor CO2 concentration is less than a first preset concentration value, if yes, step one: reducing fresh air volume is entered; if not, step two: reducing fresh air volume in a way that the air volume reduction amount is lower than that of step one is entered.

[0009] In some embodiments, after step two, it is continuously judged whether the indoor CO2 concentration is less than a second preset concentration value, if yes, step one is entered to reduce fresh air volume according to the air volume reduction way of step one; if not, the set temperature is increased; wherein the second preset concentration value is greater than the first preset concentration value.

[0010] In some embodiments, in step one, the fresh air volume G is adjusted according to the following formula: G=G0(mN-1); in step two, the fresh air volume G is adjusted according to the following formula: G=G0(nN-1).

cO2

cO2

[0011] ​​wherein G0 represents a standard air volume; N

cO2

[0012] In some embodiments, after step one or the set temperature is increased, the step of calculating the power change rate is returned after a preset time interval; each time it is returned, m and n are reduced by a preset amplitude.

[0013] In some embodiments, when the set temperature is increased to a preset temperature value, and the power consumption rate is still not less than the preset change rate, the fresh air volume is reduced in a manner higher than that in step one.

[0014] In some embodiments, in the step of processing data, the collected data is scattered and fitted to obtain a curve equation of the wall surface average temperature and the power consumption under the same set temperature.

[0015] In some embodiments, further comprising: when receiving a power grid demand response signal, calculating the fresh air load and the air conditioning load; and distributing the response target of the air conditioner and the fresh air machine according to the proportion of the fresh air load and the air conditioning load.

[0016] In some embodiments, further comprising: obtaining the maximum operating frequency of the compressor that meets the response target according to the corresponding relationship between the energy consumption and the compressor in a recent period of time.

[0017] Another aspect of the present application is an air treatment system comprising an air conditioner and a fresh air machine; a wall surface temperature detection device for detecting the average temperature of all the walls in a room; and a control center for:

[0018] collecting and processing the data of the set temperature, the wall surface average temperature and the power consumption in a recent period of time to obtain the relationship between the wall surface average temperature and the power consumption under the same set temperature, and to obtain the average power consumption;

[0019] calculating the change rate of the power consumption relative to the average power consumption according to the wall surface average temperature and the set temperature at the current time;

[0020] when the change rate of the power consumption is not less than a preset change rate, entering the energy saving mode. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 a schematic diagram of an air treatment system according to some embodiments is shown;

[0022] Figure 2 a schematic diagram of a refrigerant system of an air conditioner according to some embodiments is shown;

[0023] Figure 3 a schematic diagram of a fresh air machine according to some embodiments is shown;

[0024] Figure 4 A schematic view of a fresh air fan according to some embodiments is shown;

[0025] Figure 5 A schematic view of an air handling system according to some embodiments is shown;

[0026] Figure 6 A block diagram of a control component of an air handling system according to some embodiments is shown;

[0027] Figure 7 A control flowchart of an air handling system according to some embodiments is shown.

[0028] In the above figures: 100, air handling system; 200, air conditioner; 210, outdoor unit; 213, compressor; 214, outdoor heat exchanger; 215, four-way valve; 216, outdoor expansion valve; 217, oil separator; 218, gas-liquid separator; 220, indoor unit; 221, indoor heat exchanger; 222, indoor expansion valve;

[0029] 300, fresh air fan; 310, heat exchange core; 320, supply fan; 330, exhaust fan; 340, adsorption runner; 360, first heat exchanger; 370, second heat exchanger;

[0030] 400, control center; 410, storage; 420, communication module; 430, input unit; 440, wall temperature detection device; 450, power measurement device; 460, outdoor temperature and humidity detection device; 470, indoor temperature and humidity detection device; 480, fresh air supply temperature detection device. DETAILED DESCRIPTION

[0031] In order to make the purpose and implementation of the present application more clear, the exemplary implementation of the present application will be described clearly and completely in the following with reference to 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.

[0032] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0033] The terms "first", "second", "third", etc. are used only for the purpose of description and do not indicate or imply relative importance or a number of indicated technical features. Thus, features defined with "first", "second" can include one or more of such features, explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0034] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can be detachable connection, or integral connection; can be mechanical connection, can be electrical connection; can be directly connected, can be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0036] Referring to Figure 1 The air treatment system 100 of the embodiments of the present application includes an air conditioner 200 and a fresh air machine 300.

[0037] The air conditioner is briefly introduced as follows:

[0038] 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.

[0039] 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 multiple, for application in places such as shopping malls, office buildings, factories, etc.

[0040] 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 on one shell. The all-in-one machine is commonly used in the scene of ceiling installation. The outdoor unit 210 is connected with the outdoor space through a wind pipe, and the indoor unit 220 is connected with the indoor space through a wind pipe.

[0041] The air conditioner has a refrigerant circuit formed by connecting the outdoor unit 210 and the indoor unit 220 with air pipes and liquid pipes.

[0042] Referring to Figure 2The outdoor unit 210 can include a compressor 213, an oil separator 217, a four-way valve 215, an outdoor heat exchanger 214, an outdoor expansion valve 216, a gas-liquid separator 218, and the like, and these components are connected by pipes.

[0043] The compressor 213 sucks and compresses refrigerant to a high temperature and high pressure. The oil separator 217 separates refrigerant and refrigerant oil discharged from the compressor 213. The four-way valve 215 is used to switch a refrigerant flow path in a heating mode and a refrigerant flow path in a cooling mode. The outdoor heat exchanger 214 is used to perform heat exchange between outdoor air and refrigerant. The outdoor expansion valve 216 is used to decompress refrigerant guided to the outdoor heat exchanger 214 in the heating mode. The gas-liquid separator 218 is used to perform gas-liquid separation of refrigerant, and prevent liquid refrigerant that is not evaporated from flowing to the compressor 213.

[0044] The d pipe of the four-way valve 215 is connected to the output of the oil separator 217, the e pipe and the c pipe of the four-way valve 215 are connected to the outdoor heat exchanger 214 and the indoor unit 220, respectively, and the s pipe of the four-way valve 215 is connected to the input of the gas-liquid separator 218.

[0045] The four-way valve 215 guides refrigerant compressed by the compressor 213 to the outdoor heat exchanger 214 in the cooling mode, and guides refrigerant compressed by the compressor 213 to the indoor heat exchanger 221 of the indoor unit 220 in the heating mode.

[0046] The outdoor heat exchanger 214 condenses refrigerant compressed by the compressor 213 in the cooling mode, and evaporates refrigerant decompressed by the indoor unit 220 in the heating mode.

[0047] The indoor unit 220 can include an indoor heat exchanger 221 and an indoor expansion valve 222.

[0048] The indoor heat exchanger 221 is used to perform heat exchange between refrigerant and indoor air. The indoor heat exchanger 221 evaporates low-pressure liquid refrigerant in the cooling mode, and condenses high-pressure gaseous refrigerant in the heating mode.

[0049] The indoor expansion valve 222 is used to decompress refrigerant supplied to the indoor heat exchanger 221 in the cooling mode.

[0050] The operation modes of the air conditioner will be described below with reference to the refrigerant circuit.

[0051] Refrigeration mode: The compressor 213 of the outdoor unit 210 compresses refrigerant. The refrigerant compressed to high temperature and high pressure passes through the oil separator 217, which separates the refrigerant and the oil. The refrigerant continues to flow to the outdoor heat exchanger 214 through the four-way valve 215. The outdoor heat exchanger 214 condenses the refrigerant into liquid state. The liquid refrigerant flows to the indoor unit 220 after passing through the outdoor expansion valve 216.

[0052] The indoor expansion valve 222 of the indoor unit 220 depressurizes and cools the liquid refrigerant. The indoor heat exchanger 221 evaporates the liquid refrigerant into gaseous state.

[0053] The gaseous refrigerant flows to the gas-liquid separator 218 via the four-way valve 215 of the outdoor unit 210. The gas-liquid separator 218 separates the refrigerant into liquid refrigerant that is not evaporated and gaseous refrigerant that is evaporated. The gaseous refrigerant continues to flow back to the compressor 213.

[0054] In the above refrigeration mode, the refrigerant generated in the indoor heat exchanger 221 exchanges heat with indoor air, so that the indoor air is cooled.

[0055] Heating mode: The compressor 213 of the outdoor unit 210 compresses refrigerant. The refrigerant compressed to high temperature and high pressure passes through the oil separator 217, which separates the refrigerant and the oil. The refrigerant continues to flow to the indoor unit 220 through the four-way valve 215.

[0056] The indoor heat exchanger 221 of the indoor unit 220 condenses the refrigerant into liquid state. The liquid refrigerant flows to the outdoor unit 210 after passing through the indoor expansion valve 222.

[0057] The outdoor expansion valve 216 of the outdoor unit 210 depressurizes and cools the liquid refrigerant. The outdoor heat exchanger 214 evaporates the liquid refrigerant into gaseous state.

[0058] The gaseous refrigerant flows to the gas-liquid separator 218 via the four-way valve 215. The gas-liquid separator 218 separates the refrigerant into liquid refrigerant that is not evaporated and gaseous refrigerant that is evaporated. The gaseous refrigerant continues to flow back to the compressor 213.

[0059] In the above heating mode, the refrigerant generated in the indoor heat exchanger 221 exchanges heat with indoor air, so that the indoor air is heated.

[0060] The following briefly introduces the fresh air machine:

[0061] The fresh air machine 300 is a device capable of discharging indoor dirty air and sending outdoor air into the indoor.

[0062] In one embodiment of the fresh air machine 300: referring to Figure 3 The fresh air machine 300 includes a casing, a heat exchange core 310, a supply fan 320, and an exhaust fan 330.

[0063] The casing forms the general appearance of the fresh air machine, and is generally cuboid in shape. The casing is provided with a fresh air outlet OA, a supply air outlet SA, a return air outlet RA, and an exhaust air outlet EA.

[0064] The heat exchange core 310 is arranged in the casing and is used to achieve heat exchange between indoor air and outdoor fresh air.

[0065] The casing is formed with a fresh air duct and an exhaust air duct, which are respectively in communication with the heat exchange core 20.

[0066] The fresh air duct is in communication with the fresh air outlet OA and the supply air outlet SA, and is used to circulate outdoor fresh air; the exhaust air duct is in communication with the return air outlet RA and the exhaust air outlet EA, and is used to circulate indoor air.

[0067] The supply fan 320 is arranged in the fresh air duct corresponding to the supply air outlet SA, and is used to force the outdoor fresh air to flow; the exhaust fan 330 is arranged in the exhaust air duct corresponding to the exhaust air outlet EA, and is used to force the indoor air to flow.

[0068] When the fresh air machine is working, under the action of the supply fan 320 and the exhaust fan 330, the indoor air from the return air outlet RA flows through the heat exchange core 310 in the exhaust air duct, and the outdoor fresh air from the fresh air outlet OA flows through the heat exchange core 310 in the fresh air duct. The two air streams exchange heat at the total heat exchange core 310, and the heat-exchanged indoor air is blown to the exhaust air outlet 14, and the heat-exchanged outdoor fresh air is blown to the supply air outlet SA.

[0069] For example, when the fresh air machine is running in the summer cooling period, the outdoor fresh air obtains cold energy from the indoor air, causing the temperature to decrease; when it is running in the winter heating period, the outdoor fresh air obtains heat energy from the indoor air, causing the temperature to increase.

[0070] In some application scenarios of the fresh air machine, the supply air outlet SA and the return air outlet RA are respectively connected to the indoor space through air ducts, and the exhaust air outlet EA and the fresh air outlet OA are respectively connected to the outdoor space through air ducts.

[0071] In another embodiment of the fresh air machine 300: on the basis of the previous embodiment, an adsorption material and a refrigeration system are combined to enable the fresh air machine 300 to adjust the sensible and latent heat loads of the fresh air. The working principle is mainly to adjust the adsorption inlet temperature through the evaporator of the refrigeration system, and to regenerate the adsorption material through the heat dissipation of the condenser of the refrigeration system, so as to realize continuous adsorption and desorption of the adsorption material.

[0072] The fresh air machine has two structural forms, one is a rotary wheel structure: the adsorption material is embodied in the form of a rotary wheel, and the rotation of the rotary wheel realizes the alternation of adsorption and regeneration; the other is a wind channel switching structure, the adsorption material is fixed, and the fresh air channel and the exhaust air channel are switched to realize the alternation of adsorption and regeneration.

[0073] Next, taking the rotary wheel type fresh air machine as an example, the structure of the fresh air machine 300 will be briefly described.

[0074] Referring to Figure 4 , the fresh air machine 300 includes an adsorption rotary wheel 340, part of which is located in the fresh air channel and part of which is located in the exhaust air channel.

[0075] The first heat exchanger 360 is arranged in the fresh air channel and located at the windward side of the adsorption rotary wheel 340. The second heat exchanger 370 is arranged in the exhaust air channel and located at the windward side of the adsorption rotary wheel 340.

[0076] The fresh air machine 300 has a refrigeration system, and its structure and working principle are the same as those of the refrigeration system of an air conditioner. The first heat exchanger 360 and the second heat exchanger 370 correspond to the outdoor heat exchanger and the indoor heat exchanger in the refrigeration system of the air conditioner, respectively.

[0077] 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 rotary wheel 340 absorbs the moisture in the fresh air, so that the fresh air is dehumidified and sent into the room. The second heat exchanger 370 is a condenser for heating the exhaust air, so that the adsorption rotary wheel 340 is regenerated.

[0078] 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 rotary wheel 340 absorbs the moisture in the exhaust air. The first heat exchanger 360 is a condenser for heating the fresh air, so that the adsorption rotary wheel 340 absorbs the moisture and separates from it, so that the fresh air is humidified.

[0079] In the following, the signal flow between the components included in the air handling system will be described.

[0080] Referring to Figure 5 and Figure 6 , the control center 400 is used to receive the detection data of the air conditioner 200 and the fresh air machine 300, and to control the operation of the air conditioner 200 and the fresh air machine 300 after calculation.

[0081] The memory 410 stores programs and data related to the operation of the air handling system. The memory 410 can be implemented by at least one of a nonvolatile 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.

[0082] The communication module 420 enables communication between the control center 400 and the air conditioner 200, and between the control center 400 and the fresh air machine 300. For example, the air conditioner 200 and the fresh air machine 300 can share information about the detected temperature and humidity to the control center 400 through the communication module 320.

[0083] The communication module 420 can be wired communication or wireless communication. The wireless communication can use at least one of fifth generation (5G) mobile communication, long term evolution (LTE), LTE-advanced (LTE-A), code division multiple access (CDMA), wideband CDMA (WCDMA), universal mobile telecommunications system (UMTS), wireless broadband (WiBro), or global mobile communication system (GSM) as a cellular communication protocol; in addition, the wireless communication can include local communication, which can include at least one of wireless fidelity (WiFi), Bluetooth, or near field communication (NFC); the wired communication can include at least one of a universal serial bus (USB), a high definition multimedia interface (HDMI), a recommended standard 232 (RS-232), or a plain old telephone service (POTS).

[0084] The input unit 430 can receive an input from a user. The input unit can include a button-type switch, a membrane switch, or a touch panel, etc. for receiving an operation command for the air handling system. Specifically, the input unit can receive an indoor set temperature Tset from a user.

[0085] The wall surface temperature detection device 440 can be disposed on a wall surface of a room to detect an average temperature Tb i of all wall surfaces of the room. For example, the wall surface temperature detection device 440 can be an infrared sensor.

[0086] The power measurement device 450 can be disposed between the air conditioner and a power source, and between the fresh air machine and the power source to detect a consumed power of the air handling system. For example, the power measurement device 450 can be a power meter.

[0087] The outdoor temperature and humidity detection device 460 can be disposed at an air inlet of an outdoor unit or at a fresh air inlet of the fresh air machine to detect a temperature and humidity of outdoor air.

[0088] The indoor temperature and humidity detection device 470 can be arranged at the air inlet of the indoor unit or the return air inlet of the fresh air machine, and is used to detect the temperature and humidity of indoor air.

[0089] The fresh air supply temperature detection device 480 can be arranged at the air supply inlet of the fresh air machine, and is used to detect the fresh air supply temperature of the fresh air machine.

[0090] In the following, the control method for realizing energy saving of the air handling system will be described.

[0091] In some embodiments of the present application, with reference to Figure 7 , the control method for the air handling system comprises:

[0092] S1, collect and process the historical data of the set temperature, the wall surface average temperature and the consumed power to establish the relationship among them.

[0093] In the S1 step, the control center accumulates and records the following data of each hour per day in the past week: the set temperature Tset of the indoor, the wall surface average temperature Tbi and the consumed power Wi, and processes these data to find the correlation among them.

[0094] After the data collection is completed, the data is classified and processed: according to different set temperatures Tset, the data of the wall surface average temperature Tbi and the consumed power Wi under the same set temperature Tset are corresponded.

[0095] For example, the classified data includes data group 1: the corresponding relationship between different wall surface average temperatures Tbi and the consumed power Wi under Tset = 26℃; data group 2: the corresponding relationship between different wall surface average temperatures Tbi and the consumed power Wi under Tset = 27℃; data group 3: the corresponding relationship between different wall surface average temperatures Tbi and the consumed power Wi under Tset = 28℃, and so on.

[0096] Data group 1:

[0097] Tset Tbi Wi 26 X11 Y11 26 X21 Y21 26 ...... ...... 26 Xn1 Yn1

[0098] Data group 2:

[0099] Tset Tbi Wi 27 X12 Y12 27 X22 Y22 27 ...... ...... 27 Xn2 Yn2

[0100] After the data classification is completed, each group of data is processed respectively:

[0101] The average value of the consumed power in each group of data is calculated to obtain the basic consumed power W0.

[0102] The scatter distribution of each group of data is obtained to obtain the fitting curve equation of the scatter points, for example: Wi = A 2 × Tbi + B × Tbi + C.

[0103] In other embodiments, if the current wall surface average temperature Tbi collected is located in the table, the corresponding power consumption Wi can be directly obtained according to the table; if the current wall surface average temperature Tbi collected is not in the table, the power value can be assumed to be located on the straight line connecting the two adjacent data points to obtain the power value.

[0104] Since the influence of the fresh air load on the indoor environment is first reflected on the wall, and then slowly reflected in the indoor air, the application can predict the change of the indoor temperature in advance by detecting the wall surface average temperature, so that the subsequent energy-saving operation is advanced. Compared with the monitoring of the indoor temperature in the prior art, the application is more energy-saving.

[0105] S2, calculate the change rate Xi of the power consumption Wi according to the wall surface average temperature Tbi at the current time and the set temperature.

[0106] In step S2, when the wall surface average temperature Tbi changes, the indoor load will change. According to the relationship between the wall surface average temperature Tbi and the power consumption Wi under the same set temperature, the change of the power consumption Wi can be predicted in advance, and the change rate of the power consumption Xi is calculated: Xi=(Wi-W0) / W0.

[0107] S3, judge whether the change rate of the power consumption is not less than the preset change rate, if yes, enter the energy-saving mode; otherwise, keep the current state and do not enter the energy-saving mode.

[0108] Exemplarily, the preset change rate is 10%, if the change rate Xi is greater than or equal to 10%, it indicates that the energy consumption of the system will increase, at this time, a part of the energy consumption can be reduced by energy-saving of the fresh air fan; if the change rate is less than 10%, it indicates that the energy consumption of the system changes little or decreases, and the fresh air fan does not need to be energy-saving to reduce the energy consumption.

[0109] The specific steps of the energy-saving mode include: S11, judging whether the indoor CO2 concentration is less than a first preset concentration value, if yes, entering step S12: reducing the fresh air volume; otherwise, entering step S13: reducing the fresh air volume in a way that the degree of air volume reduction is lower than that of step S12. The reduction of the fresh air volume can be realized by controlling the air speed of the air supply fan.

[0110] Exemplarily, the first preset concentration value is 0.1%. If the indoor CO2 concentration is less than 0.1%, it indicates that the indoor air quality is good, and less fresh air volume can meet the user's demand, therefore, under this condition, the fresh air volume is reduced, which will not cause discomfort to the user, and the energy consumption of the fresh air fan can be reduced to achieve the purpose of energy saving.

[0111] If the indoor CO2 concentration is not less than 0.1%, it means that a certain amount of fresh air is needed to reduce the indoor CO2 concentration. At this time, the fresh air volume can be reduced slightly so that the system energy consumption will not increase too much.

[0112] After step 2, after a period of time, proceed to S14 to determine whether the indoor CO2 concentration is less than the second preset concentration value. If so, return to step 1 in S12 and reduce the fresh air volume according to the air volume reduction method in step 1; if not, enter S15 and increase the set temperature.

[0113] The second preset concentration value is greater than the first preset concentration value. For example, the second preset concentration value = 0.15%, and the second preset concentration value may be the upper limit of the allowable indoor CO2 concentration.

[0114] If the indoor CO2 concentration is less than 0.15%, it means that the indoor CO2 concentration is within an acceptable range. At this time, the fresh air volume can be reduced to reduce energy consumption. If the indoor CO2 concentration is not less than 0.15%, it means that the indoor demand for fresh air is urgent and energy saving cannot be achieved by reducing the fresh air volume. At this time, the system energy consumption can be reduced by increasing the set temperature.

[0115] In some embodiments, in step 1, the fresh air volume G can be adjusted according to the following formula:

[0116] G=G0(mN

CO2

[0117] In step 2, the fresh air volume G can be adjusted according to the following formula:

[0118] G=G0(nN

CO2

[0119] Among them, G0 represents the standard air volume; N

CO2

[0120] In some embodiments, after S12 or S15 , the process returns to S2 at intervals of a preset time length N, and each time the process returns, m and n decrease by a preset amount.

[0121] After the cycle is interrupted, when re-entering the energy-saving mode, m and n return to the initial values.

[0122] For example, the value of m decreases by 6%, the value of n decreases by 5%, and m i =m i-1 -6%, n i =n i-1 -5%.m i 、n i Indicates the current value of m and n, m i-1 、ni-1 Indicates the value of m, n last time.

[0123] After S12 or S15, return to S2 to rejudge the power change rate after N minutes. If the power change rate meets the condition to enter the energy saving mode again, the fresh air volume will be the same as that of the previous time if the values of m, n are fixed values, which cannot achieve the purpose of reducing the fresh air volume. Therefore, m, n need to be variable numbers, so that the fresh air volume will be reduced each time to meet the energy saving demand.

[0124] In some embodiments, when the set temperature Tset is increased to the preset temperature value, the power consumption rate is still not less than the preset change rate, and the fresh air volume is reduced in a manner that the air volume reduction amount is higher than that in step one.

[0125] In this step, the fresh air volume can be reduced by a preset multiple ( < 1) of the current air volume.

[0126] For example, the preset temperature value = 28℃, and the preset multiple = 50%. When Tset≥28℃ and Xi≥10%, the fresh air volume is directly reduced to 50% of the current air volume.

[0127] If the set temperature Tset reaches 28℃, the power consumption of the system is still relatively high, which means that energy saving cannot be achieved by increasing the set temperature. At this time, energy saving can only be achieved by significantly reducing the fresh air volume.

[0128] In some embodiments, S31, when the grid demand response signal is received, the fresh air load and the air conditioning load are calculated; S32, the response target of the air conditioner and the fresh air machine is distributed according to the proportion of the fresh air load and the air conditioning load.

[0129] In this step, the indoor set enthalpy value can be obtained according to the indoor set temperature and humidity, the outdoor enthalpy value can be obtained according to the outdoor temperature and humidity, and the fresh air load can be obtained according to the indoor set enthalpy value, the outdoor enthalpy value, and the fresh air volume. The air conditioning load can be obtained by the air conditioning refrigerating capacity / efficiency.

[0130] The proportion of the fresh air load and the air conditioning load is calculated, and then the response target is distributed according to the proportion. For example, the air conditioner bears E% of the response target, and the fresh air machine bears F% of the response target.

[0131] S33, according to the corresponding relationship between the energy consumption and the compressor operating frequency in a period of time, the maximum operating frequency of the compressor that meets the demand response is obtained.

[0132] In this step, the corresponding data of the compressor running frequency and energy consumption of the air conditioner in the past 7 days and the corresponding data of the compressor running frequency and energy consumption of the fresh air machine in the past 7 days are collected in real time. Then, according to the respective response targets, the maximum running frequency of the compressor of the air conditioner and the maximum running frequency of the compressor of the fresh air machine can be obtained.

[0133] The target running frequency of the compressor = the maximum running frequency - the preset value.

[0134] For the air conditioning system:

[0135] S41, set the set temperature of the air conditioner in the range of [T1, T2]. For example, T1 = 27℃ and T2 = 29℃.

[0136] S42, judge whether the indoor temperature Tin < T3 is true, T1 < T3 < T2, for example, T3 = 28℃; if true, the compressor of the air conditioner is reduced by AHz, for example, A = 6Hz; if not true, and still not true for a preset time, the fresh air machine is turned off.

[0137] In this step, if the indoor temperature < 28℃, it means that the indoor temperature is appropriate, and the frequency can be reduced to further save energy.

[0138] If the indoor temperature cannot be reduced for a period of time, the fresh air machine needs to be turned off to ensure that the indoor temperature is within the set temperature range by reducing the influence of fresh air load on the indoor temperature.

[0139] S43, judge whether the indoor temperature Tin < T1 is true; if true, the compressor of the air conditioner is reduced by BHz, for example, B = 15Hz; if not true, and still not true for a preset time, the fresh air machine is turned off.

[0140] The indoor temperature < T1℃ means that the indoor temperature is lower than the set temperature, and the compressor can run at a lower frequency to maintain the indoor temperature.

[0141] S44, judge whether the indoor temperature Tin > T2 is true; if true, the compressor of the air conditioner is increased, and the frequency of the compressor after the increase cannot be greater than the maximum running frequency.

[0142] Return to S42 to rejudge every 15min.

[0143] For the fresh air machine:

[0144] S51, judge whether the supply air temperature Tsa of the fresh air machine > T2 is true; if true, reduce the fresh air volume according to the following formula; increase the frequency of the compressor of the fresh air machine.

[0145] G = G0(αN

CO2

[0146] If no, the fresh air volume is executed according to the standard air volume.

[0147] In this step, if the supply air temperature is higher than the upper limit value of the set temperature, the fresh air sent into the room will make the indoor temperature rise, at this time, the fresh air volume can be reduced to reduce the influence of the fresh air on the indoor temperature.

[0148] S52, after S51, interval preset time, for example, interval 10 min, rejudge supply air temperature Tsa > T3 is established; if yes, according to the following formula, reduce the fresh air volume.

[0149] G = G0(βN

CO2

[0150] Alpha, beta is a preset value, alpha > beta.

[0151] If no, the fresh air volume is executed according to the standard air volume.

[0152] In this step, compared with S51, the supply air temperature of fresh air is reduced, but it is still close to the upper limit value of the set temperature, at this time, the fresh air volume can be reduced to reduce the energy consumption of the fresh air machine, and the fresh air load is reduced, thereby reducing the energy consumption of the air conditioner.

[0153] If the compressor frequency is increased, and the supply air temperature Tsa is always greater than T2 for 30 min, the fresh air machine is closed.

[0154] In this application, the corresponding relationship between the wall average temperature and the power consumption can be simulated according to the recent historical operation data, and the power consumption of the system can be predicted from the wall average temperature. When the power consumption rate increases, the energy consumption is reduced by reducing the fresh air volume, and the reduction of the fresh air load also reduces the energy consumption of the air conditioner, thereby achieving the purpose of energy saving.

[0155] In this application, when the indoor CO2 concentration meets the comfort demand, the energy is saved by reducing the fresh air volume, and when the indoor CO2 concentration is high, the energy is saved by increasing the set temperature, that is, the energy consumption of the air conditioner will be reduced after increasing the set temperature.

[0156] In this application, a positive correlation between CO2 concentration and fresh air volume is established, so that the adjusted fresh air volume can meet the indoor demand and will not cause energy waste.

[0157] In this application, when responding to the demand response of the power grid, the response target of the air conditioner and the fresh air machine is allocated according to the proportion of the fresh air load and the air conditioning load. The maximum operating frequency of the compressor is calculated from the response target, and the response demand is reasonably responded.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; 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.

[0159] The foregoing description has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Modifications and variations are possible in light of the above teachings or can be acquired from practice of the embodiments. The described embodiments were chosen and described in order to explain the principles of the embodiments and its practical application and to enable others skilled in the art to best use the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A control method for an air handling system, characterized in that: The air treatment system includes an air conditioner and a fresh air blower; The control method includes: Data processing: Collect and process the data of set temperature, average wall temperature and power consumption in a recent period of time to obtain the relationship between the average wall temperature and power consumption at the same set temperature, and obtain the average power consumption; Calculate the power change rate: Calculate the change rate of the power consumption relative to the average power consumption based on the current average wall temperature and the set temperature; Energy saving judgment: judge whether the change rate of power consumption is not less than the preset change rate. If so, enter the energy saving mode; if not, maintain the current state.

2. The control method of the air treatment system according to claim 1, characterized in that: In energy-saving mode, determine whether the indoor CO2 concentration is less than the first preset concentration value. If so, proceed to step 1: reduce the fresh air volume; if not, proceed to step 2: reduce the fresh air volume by a smaller amount than that in step 1.

3. The control method of the air treatment system according to claim 2, characterized in that: After step 2, continue to determine whether the indoor CO2 concentration is less than the second preset concentration value. If so, proceed to step 1 and reduce the fresh air volume according to the air volume reduction method of step 1; if not, increase the set temperature; The second preset concentration value is greater than the first preset concentration value.

4. The control method of the air treatment system according to claim 2 or 3, characterized in that: In step 1, the fresh air volume G is adjusted according to the following formula: G = G0 (mN 【CO2】 -1); In step 2, the fresh air volume G is adjusted according to the following formula: G = G0 (nN 【CO2】 -1); Among them, G0 represents the standard air volume; N 【CO2】 Indicates indoor CO2 concentration; m<n.

5. The control method of the air treatment system according to claim 4, characterized in that: After step 1 or increasing the set temperature, the process returns to the step of calculating the power change rate at intervals of a preset time; each time the process returns, m and n decrease by a preset amplitude.

6. The control method of the air treatment system according to claim 3, characterized in that: When the set temperature rises to the preset temperature value, and the power consumption change rate is still not less than the preset change rate, the fresh air volume is reduced in such a way that the air volume reduction amount is higher than that in step one.

7. The control method of the air treatment system according to claim 1, characterized in that: In the data processing step, the collected data are scattered and fitted with a curve to obtain a curve equation of the average wall temperature and power consumption at the same set temperature.

8. The control method of the air treatment system according to claim 1, characterized in that: Also includes: When receiving a grid demand response signal, calculate the fresh air load and air conditioning load; Allocate the response targets of air conditioning and fresh air fans according to the ratio of fresh air load to air conditioning load.

9. The control method of the air treatment system according to claim 8, characterized in that: Also includes: According to the corresponding relationship between energy consumption and compressor in a recent period of time, the maximum operating frequency of the compressor that meets the response target is obtained.

10. An air treatment system, characterized in that: include: Air conditioners and fresh air fans; Wall temperature detection device, used to detect the average temperature of all walls in the room; Control Center for: Collect and process data on set temperature, average wall temperature and power consumption over a recent period of time to obtain the relationship between average wall temperature and power consumption at the same set temperature, and to obtain the average power consumption; Calculate the rate of change of power consumption relative to average power consumption based on the current average wall temperature and the set temperature; When the change rate of power consumption is not less than the preset change rate, the system enters the energy-saving mode.

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