Air conditioner and control method thereof

Abstract

The application discloses an air conditioner and a control method thereof, and belongs to the technical field of air treatment. The air conditioner comprises a main heat exchanger and an auxiliary heat exchanger, the auxiliary heat exchanger is used as a condenser in an isothermal dehumidification mode, and the air dehumidified by the main heat exchanger is heated; a fresh air valve is used for controlling the fresh air introduction amount; an air return valve is used for controlling the air return introduction amount; a temperature and humidity sensor module is used for collecting the temperature and humidity values indoors and outdoors; an air quality sensor module is used for collecting the values of various air quality parameters indoors; a controller is configured to: acquire the temperature and humidity values collected by the temperature and humidity sensor module and the values of various air quality parameters collected by the air quality sensor module; couple the acquired various air quality parameters to obtain an air quality comprehensive index IAQ; and adjust the opening degrees of the fresh air valve and the air return valve according to the grade of the air quality comprehensive index IAQ and the temperature and humidity values indoors and outdoors. The application can guarantee the indoor air quality and optimize energy saving.

Description

Technical Field

[0001] This application relates to the field of air treatment technology, and in particular to an air conditioner and its control method. Background Technology

[0002] An air conditioner is a unit designed to appropriately control indoor airflow, temperature, humidity, or cleanliness for intended use. To meet users' demands for high-quality indoor air, some air conditioners have dehumidification and fresh air intake functions; these units are also known as fresh air dehumidifiers.

[0003] Existing fresh air dehumidifiers typically use a combination of fresh air valves and return air valves to regulate indoor air circulation, balancing indoor and outdoor air exchange by controlling the amount of fresh air introduced and the amount of return air recovered. Current technologies primarily rely on single-dimensional triggering based on air quality, neglecting the impact of indoor and outdoor temperature and humidity differences on isothermal dehumidification efficiency. When there is a significant difference between the outdoor fresh air temperature and humidity and the indoor environment, introducing excessive fresh air to meet air quality requirements will significantly increase the dehumidification load and energy consumption, while also burdening the main and auxiliary heat exchangers and affecting temperature stability. Furthermore, the valve opening adjustment in these solutions often uses fixed values ​​or simple linear adjustment methods, failing to adaptively optimize for dynamically changing environmental conditions. Summary of the Invention

[0004] This application provides an air conditioner and its control method, which dynamically and adaptively adjusts the ratio of air valves to ensure indoor air quality and optimize energy efficiency.

[0005] One aspect of this application proposes a control method for an air conditioner, the air conditioner comprising: a casing having a return air inlet and a fresh air inlet formed thereon, the return air inlet being used to introduce indoor air into the casing, and the fresh air inlet being used to introduce outdoor air into the casing; a fan disposed within the casing; a heat exchanger for exchanging heat with the air driven by the fan; the heat exchanger including a main heat exchanger and an auxiliary heat exchanger, wherein in an isothermal dehumidification mode, the auxiliary heat exchanger acts as a condenser to heat the air after cooling and dehumidification by the main heat exchanger; a fresh air valve for controlling the amount of outdoor air introduced; and a return air valve for controlling the amount of indoor air introduced. Control methods include: It measures indoor and outdoor temperature and humidity levels, as well as various indoor air quality parameters. The combined air quality index (IAQ) is obtained by coupling multiple air quality parameters. Adjust the opening degree of the fresh air valve and return air valve according to the air quality index (IAQ) level and the indoor and outdoor temperature and humidity values.

[0006] This technical solution couples multiple air quality parameters into an IAQ (Indoor Air Quality), overcoming the limitations of single-parameter thresholds and achieving precise quantification of pollution levels. By coordinating the adjustment of damper opening based on IAQ levels and temperature and humidity, it integrates IAQ and indoor / outdoor temperature and humidity data. This avoids the problems of fixed or simple linear damper opening adjustments in existing technologies, which fail to adapt to dynamically changing environmental conditions, leading to energy waste or fluctuating dehumidification effects.

[0007] In some embodiments, the specific steps for coupling multiple acquired air quality parameters to obtain the Integrated Air Quality Index (IAQ) include: Normalization of each air quality parameter yields the corresponding normalized pollution index; Based on the scenario-based weighting coefficients of each indoor air quality parameter, the normalized pollution index is weighted and summed to obtain the comprehensive air quality index (IAQ).

[0008] In this technical solution, the weights are differentiated according to the scenario, making the weight allocation more consistent with the actual environmental conditions, thereby making the quantification of air pollution level more accurate. By normalizing each air quality parameter, multiple parameters can be coupled into a comprehensive index, which takes into account multiple air quality parameters and makes it easier to judge the degree of indoor air pollution.

[0009] In some embodiments, the control method further includes adaptive optimization of weighting coefficients; the steps of adaptive optimization of weighting coefficients include: An objective function is established based on the IAQ value, energy consumption data, and fault frequency from historical operating data. The weight coefficients are then updated iteratively by minimizing the objective function.

[0010] In this technical solution, based on historical IAQ values, energy consumption data, and fault frequency, the weighting coefficients are optimized through machine self-learning, which can achieve a balance between IAQ compliance rate, ventilation energy consumption, and fault frequency. Under the condition of high IAQ compliance rate, the goal of energy saving and fewer faults can be achieved.

[0011] In some embodiments, the step of adaptive optimization of weight coefficients further includes: applying boundary constraints and normalization to the iteratively updated weight coefficients to obtain the final weight coefficients.

[0012] In this technical solution, boundary constraints and normalization processes can ensure that the optimized weight coefficients meet engineering requirements.

[0013] In some embodiments, the specific steps for adjusting the opening of the fresh air valve and the return air valve include: Determine if IAQ≤IAQ3 is true. If yes, then IAQ is at a safe level, and adjust the opening of the fresh air valve according to the indoor and outdoor temperature and humidity. If no, adjust the opening of the fresh air valve according to the principle that the size of IAQ is positively correlated with the opening of the fresh air valve. The opening degree of the return air valve is obtained by calculating that the sum of the opening degree of the fresh air valve and the opening degree of the return air valve equals 100%.

[0014] In this technical solution, provided indoor air quality meets standards, the introduction of ineffective fresh air and energy waste can be reduced by coordinating temperature and humidity and optimizing dehumidification load. When indoor air quality does not meet standards, adjusting the opening of the fresh air valve according to the degree of indoor air pollution allows for the priority and rapid introduction of fresh air, improving indoor air quality and better meeting the needs of the actual environment.

[0015] In addition, the technical solution has clear priorities, avoiding the inability to achieve synergistic optimization when air quality requirements conflict with temperature and humidity regulation and dehumidification and energy saving requirements, which can easily lead to problems such as "IAQ not meeting the standard but excessive recovery of return air" or "sacrificing isothermal accuracy for ventilation".

[0016] In some embodiments, the specific steps for adjusting the opening degree of the fresh air valve according to the principle that the size of IAQ is positively correlated with the opening degree of the fresh air valve include: When IAQ > IAQ1, the fresh air valve is fully open; When IAQ3 < IAQ ≤ IAQ1, based on the minimum fresh air guarantee opening corresponding to the IAQ level, the opening of the fresh air valve is increased accordingly based on the degree of deviation of IAQ from the lower endpoint IAQn of the IAQ level range. Among them, the preset IAQ level has a one-to-one correspondence with the minimum fresh air guarantee opening degree.

[0017] In this technical solution, the opening degree of the fresh air valve is dynamically adjusted according to the indoor air quality, which can ensure indoor air quality in a relatively energy-efficient manner.

[0018] In some embodiments, when IAQ3 < IAQ ≤ IAQ1, the percentage difference between IAQ and IAQn multiplied by the weighting coefficient corresponding to the interval in which IAQ is located is the opening increment of the fresh air valve.

[0019] In some embodiments, when the IAQ is at a security level... When the outdoor temperature and humidity are lower than the indoor temperature and humidity and the difference between the two is not greater than the preset value, the opening of the fresh air valve is increased based on the minimum fresh air guarantee opening corresponding to the safety level. When the outdoor humidity is greater than the indoor humidity and the difference between the two is greater than the preset humidity value, the opening of the fresh air valve is reduced based on the minimum fresh air guarantee opening corresponding to the safety level. When the outdoor humidity is greater than the indoor humidity and the difference between the two is not greater than the preset humidity value, the opening degree of the fresh air valve is the minimum fresh air guarantee opening degree corresponding to the safety level.

[0020] In this technical solution, under the premise of meeting IAQ standards, the introduction of ineffective fresh air is reduced and energy waste is reduced by coordinating temperature and humidity and optimizing dehumidification load.

[0021] In some embodiments, when the outdoor temperature and humidity are lower than the indoor temperature and humidity and the difference between the two is not greater than a preset value, the opening increment of the fresh air valve is obtained by weighted summation of the difference between the indoor humidity and the set humidity, and the difference between the indoor temperature and the set temperature. When the outdoor humidity is greater than the indoor humidity and the difference between the two is greater than the preset humidity value, the reduction in the opening of the fresh air valve is obtained by weighting the difference between the outdoor humidity and the indoor humidity.

[0022] Another aspect of this application proposes an air conditioner, including a casing with a return air inlet and a fresh air inlet formed thereon. The return air inlet is used to introduce indoor air, and the fresh air inlet is used to introduce outdoor air. A fan is disposed inside the casing. A heat exchanger is used to exchange heat with the air driven by the fan. The heat exchanger includes a main heat exchanger and an auxiliary heat exchanger. In the isothermal dehumidification mode, the auxiliary heat exchanger acts as a condenser to heat the air after cooling and dehumidification by the main heat exchanger. A fresh air valve is used to control the amount of outdoor air introduced. A return air valve is used to control the amount of indoor air introduced. A temperature and humidity sensor module is used to collect indoor and outdoor temperature and humidity values. An air quality sensor module is used to collect values ​​of various indoor air quality parameters. The controller is configured as follows: Acquire the temperature and humidity values ​​collected by the temperature and humidity sensor module, as well as the values ​​of various air quality parameters collected by the air quality sensor module; The combined air quality index (IAQ) is obtained by coupling multiple air quality parameters. Adjust the opening degree of the fresh air valve and return air valve according to the air quality index (IAQ) level and the indoor and outdoor temperature and humidity values.

[0023] This technical solution couples multiple air quality parameters into an IAQ (Indoor Air Quality), overcoming the limitations of single-parameter thresholds and achieving precise quantification of pollution levels. By coordinating the adjustment of damper opening based on IAQ levels and temperature and humidity, it integrates IAQ and indoor / outdoor temperature and humidity data. This avoids the problems of fixed or simple linear damper opening adjustments in existing technologies, which fail to adapt to dynamically changing environmental conditions, leading to energy waste or fluctuating dehumidification effects. Attached Figure Description

[0024] Figure 1 A schematic diagram of an air conditioner according to some embodiments is shown; Figure 2 A flowchart illustrating the adjustment of an air conditioner's damper according to some embodiments is shown; Figure 3 A flowchart illustrating the calculation of the composite air quality index for an air conditioner according to some embodiments is shown; Figure 4 A flowchart illustrating the adaptive optimization of scenario-based weighting coefficients for an air conditioner according to some embodiments is shown. Figure 5 A flowchart of the air valve adjustment of an air conditioner according to some other embodiments is shown.

[0025] In the above figures, 10 is the casing; 10a is the air supply outlet; 10b is the return air outlet; 10c is the fresh air inlet; 21 is the main heat exchanger; 22 is the auxiliary heat exchanger; 30 is the fan; 40 is the air inlet filter; 51 is the fresh air valve; and 52 is the return air valve. Detailed Implementation

[0026] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0027] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0031] The compressor compresses refrigerant gas at a low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0032] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0033] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0034] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0035] The following is in conjunction with the appendix Figures 1-5 The implementation methods of this application will be described in detail.

[0036] Reference Figure 1 The air conditioner includes a housing 10, which constitutes the general appearance of the air conditioner. The housing 10 may be arranged in the form of a cuboid and includes a bottom wall, a top wall, and four side walls connecting the bottom wall and the top wall.

[0037] An air inlet can be provided on one side wall of the housing 10 for supplying air into the housing 10; an air outlet 10a can be provided on the side wall of the housing 10 opposite to the air inlet, and the air is processed in the air conditioner and then sent to the room through the air outlet 10a.

[0038] In some embodiments, there are at least two air inlets, one of which is a return air inlet 10b and the other is a fresh air inlet 10c. The return air inlet 10c is used to allow indoor air to enter the housing 10, and the fresh air inlet 10c is used to allow outdoor air to enter the housing 10.

[0039] The return air vent 10b and the fresh air vent 10c are located on the same side wall of the housing 10. In other embodiments, the return air vent 10b and the fresh air vent 10c may be located on the side walls of the housing 10 in different directions.

[0040] In the current example, the air conditioner is a ducted air conditioner, and the air inlet and / or air outlet 10a are connected to the target room through the air duct. Therefore, an air outlet flange can be installed at the air inlet and / or air outlet 10a for connection to the air duct. However, the embodiments of this application are not limited to this.

[0041] The air conditioner may include a heat exchanger. The heat exchanger may be disposed inside the housing 10 and may be disposed along the movement path from the air inlet to the air outlet 10a. The heat exchanger is used to absorb heat from the introduced air or to transfer heat to the air.

[0042] In some embodiments, the heat exchanger includes a main heat exchanger 21 and an auxiliary heat exchanger 22. The main heat exchanger 21 and the auxiliary heat exchanger 22 are arranged sequentially along the air movement path, that is, the auxiliary heat exchanger 22 is located on the leeward side of the main heat exchanger 21, and the main heat exchanger 21 is located on the windward side of the auxiliary heat exchanger 22.

[0043] The air conditioner can operate in isothermal dehumidification mode: In this mode, the main heat exchanger 21 is used as an evaporator to cool and dehumidify the air, and the auxiliary heat exchanger 22 is used as a condenser to reheat the dehumidified cold air.

[0044] The air conditioner may include a fan 30. The fan 30 may be located inside the housing 10. The fan 30 drives airflow so that air can flow from the air inlet, through the heat exchanger, to the air outlet 10a. The fan 30 may be a centrifugal fan, capable of generating high static pressure to accommodate the duct resistance of duct-mounted installations.

[0045] The air conditioner may include an air inlet filter 40, which is installed inside the housing 10 corresponding to the air inlet, to filter the air introduced into the air inlet in order to avoid the problem of dust accumulation inside the unit after long-term operation.

[0046] The fresh air inlet 10c and the return air inlet 10b are located on the same side wall of the housing 10, and the inlet filter 40 may be in the shape of a regular cuboid. The inlet filter 40 may include at least one of a coarse filter and a high-efficiency filter.

[0047] In some embodiments, a coarse filter and a high-efficiency filter are arranged sequentially along the airflow path.

[0048] The coarse filter uses non-woven fabric to filter large particles of dust and insects from the air. The high-efficiency filter, or HEPA filter, uses glass fiber and melt-blown non-woven filter materials to intercept particulate matter, bacteria, and viruses.

[0049] In some embodiments, the air conditioner includes a fresh air valve 51, the opening of which is adjustable to control the amount of outdoor air introduced. The fresh air valve 51 may be located at the fresh air inlet 10c or inside the duct connected to the fresh air inlet 10c. The air conditioner includes a return air valve 52, the opening of which is adjustable to control the amount of indoor air introduced. The return air valve 52 can be installed at the return air inlet 10b or in the duct connected to the return air inlet 10b.

[0050] In some embodiments, the air conditioner includes an air quality sensor module for real-time monitoring of indoor air quality parameters.

[0051] The air quality sensor module includes a particulate matter sensor (PM sensor). For example, a particulate matter sensor uses the principle of laser scattering for detection. When airborne particles pass through, they scatter laser light. By detecting the intensity and angle of the scattered light, the particulate matter sensor can calculate the concentration and size of the particles, such as PM2.5 (particles with a diameter less than 2.5 micrometers) or PM10 (particles with a diameter less than 10 micrometers). The particulate matter sensor can detect dust, pollen, or smog in the air.

[0052] The air quality sensor module includes a carbon dioxide sensor. For example, the carbon dioxide sensor detects carbon dioxide based on the principle of non-dispersive infrared radiation. The carbon dioxide sensor includes an infrared light source and a detection probe. Because carbon dioxide molecules absorb infrared light of a specific wavelength, causing a decrease in light intensity, the carbon dioxide sensor calculates the carbon dioxide concentration by comparing the difference in light intensity before and after absorption.

[0053] Air quality sensor modules include volatile organic compound (VOC) sensors. For example, a VOC sensor uses a metal oxide semiconductor for detection; its surface is coated with a metal oxide, which changes resistivity when formaldehyde, benzene, or other volatile organic compounds come into contact with it. The concentration is calculated by measuring the change in resistance.

[0054] In some embodiments, the air conditioner includes a temperature and humidity sensor module for real-time detection of indoor and outdoor temperature and humidity. The humidity mentioned in this application can refer to relative humidity.

[0055] The air conditioner includes a controller. The controller includes a processor. The processor can be a dedicated processor (e.g., a microcontroller or digital signal processor), a central processing unit (CPU), etc. The controller also includes a storage component, which can be volatile memory and / or non-volatile memory. The processor can access instructions or applications stored in the storage component to perform related functions. The controller also includes a display device for displaying various information, including but not limited to temperature, humidity, mode, time, or status alarms. The display device can be an LCD display, LED display, OLED display, and / or LED indicator lights, or other display devices, which will not be listed here. The controller also includes an operating device for performing various operations, such as buttons, knobs, integrated touchscreens, voice recognition modules, gesture controllers, etc. The controller also includes a communication interface, such as Wi-Fi, Bluetooth, Zigbee, etc. The communication interface allows mobile terminals (e.g., mobile phones) to communicate remotely with the fresh air system via an app, or enables the fresh air system to communicate remotely with the cloud. The controller also includes a drive unit responsible for managing peripheral devices and interacting with the storage medium, including data reading and writing, signal conversion, and event processing. The processor, volatile memory, non-volatile memory, display device, operating device, communication interface, and drive device are interconnected via a bus to form an integrated system.

[0056] The structure of the air conditioner has been described above. The following section will describe a method for adjusting the opening of the fresh air valve and return air valve based on indoor air quality parameters and indoor and outdoor temperature and humidity. The operations described below can be performed by a controller.

[0057] The control procedure of this application needs to obtain the values ​​of various indoor air quality parameters, which may include at least two of CO2, PM2.5, and VOC. The following description uses CO2, PM2.5, and VOC as examples of various indoor air quality parameters.

[0058] Reference Figure 2 The acquired air quality parameters are coupled to obtain the Integrated Air Quality Index (IAQ). The opening degree of the fresh air valve and return air valve is adjusted according to the IAQ level and the indoor and outdoor temperature and humidity values.

[0059] In this application, multiple air quality parameters are coupled into an IAQ (Indoor Air Quality), overcoming the limitations of single-parameter thresholds and achieving precise quantification of pollution levels. By coordinating the adjustment of the air valve opening based on the IAQ level and temperature / humidity, ineffective fresh air intake can be reduced, thus lowering energy waste. For example, when indoor air quality is good, excessive fresh air intake is unnecessary; however, introducing too much fresh air with high humidity will increase the energy consumption of the air conditioner.

[0060] In some embodiments, refer to Figure 3 The Air Quality Index (IAQ) is obtained in the following way: Normalization of various air quality parameters X i The corresponding normalized pollution index P was obtained. i Based on various indoor air quality parameters X i Contextualized weighting coefficient W i For the normalized pollution index P i The weighted summation yields the Air Quality Index (IAQ).

[0061] In this embodiment, the subscript i takes values ​​of 1, 2, and 3. X1 represents the CO2 parameter value, X2 represents the PM2.5 parameter value, and X3 represents the VOC parameter value. P1 represents the normalized pollution index (NPI) value of CO2, P2 represents the NPI value of PM2.5, and P3 represents the NPI value of VOC. W1 represents the weighting coefficient of CO2, W2 represents the weighting coefficient of PM2.5, and W3 represents the weighting coefficient of VOC.

[0062] Based on national / industry standards, the baseline values ​​for each air quality parameter are set as follows:

[0063] As shown in the table, the safety benchmark for CO2 is set at 800 ppm, meeting the requirements for the excellent level in GB / T 18883-2022 "Indoor Air Quality Standard"; the safety benchmark for PM2.5 is set at 35 μg / m³, meeting the daily average requirement for the first-level standard in GB 3095-2012 "Ambient Air Quality Standard"; and the safety benchmark for VOCs is set at 0.4 mg / m³, meeting the TVOC concentration limit requirements in GB / T 18883-2022. The warning benchmark and the exceedance benchmark are set at 1.25 times and 1.5 times the safety benchmark, respectively, for threshold judgment in the tiered control strategy.

[0064] Normalization is performed using a piecewise linear mapping method: When X i When S ≤ S0, P i =0; when S0 < X i When P ≤ S1 i =(X i -S0) / (S1-S0); when S1 < X i When S2 ≤ S2, P i =(X i -S1) / (S2-S1)+1; when X i When P > S2, i =2.

[0065] The memory can pre-store the weighting coefficients W of various air quality parameters under different application scenarios. i For example, the contextual weighting coefficients can be set according to the following table:

[0066] As shown in the table, the CO2 weight is set to 0.5 in the precision electronics workshop scenario because the processing of electronic components involves dense personnel and high equipment heat dissipation, making CO2 concentration prone to rise. The VOC weight is set to 0.5 in the cultural relic warehouse scenario because cultural relic preservation is sensitive to volatile organic compounds, requiring strict control of VOC concentration. In the laboratory scenario, VOC and CO2 weights are set to 0.4 and 0.3 respectively, because experiments may generate CO2 from chemical reagent volatilization and personnel respiration. The general office scenario uses a relatively balanced weight configuration. Users can select the application scenario through the human-computer interaction interface, and the system automatically loads the corresponding initial weight coefficients.

[0067] After normalization, the normalized values ​​are weighted and summed according to the scenario-based weighting coefficients W1, W2, and W3 to obtain the comprehensive air quality index (IAQ). The calculation formula is: IAQ = W1 × P1 + W2 × P2 + W3 × P3.

[0068] In some embodiments, refer to Figure 4 The scenario-based weighting coefficients can be adaptively optimized.

[0069] Based on historical operating data of the unit, the weight coefficient W is dynamically adjusted using a gradient descent algorithm. i (W1, W2, W3) to achieve a multi-dimensional balance of three major goals: First, the core goal: IAQ compliance rate ≥ 98% (prioritizing air quality); Second, the energy-saving goal: ventilation energy consumption ≤ 85% of the baseline energy consumption (the baseline energy consumption is the average energy consumption under fixed weights); Third, the equipment goal: main / auxiliary heat exchanger failure frequency ≤ 1 time / year (avoiding equipment damage caused by extreme operating conditions).

[0070] According to this embodiment, an objective function is established based on the IAQ value, energy consumption data and fault frequency in historical operating data, and the weight coefficients are updated iteratively by minimizing the objective function.

[0071] The weight optimization algorithm employs a combination of offline training and online updates, with an optimization cycle of 24 hours per cycle, specifically executed daily between 2:00 AM and 2:30 AM during the low-load period for equipment. The algorithm steps are as follows: Step 1: Initialize parameters. Initialize the weight values according to the preset scenario weights, which can be extracted from the above table according to the usage scenario. For example, in the installation scenario of the air conditioner in a precision electronics workshop, W1 = 0.5, W2 = 0.3, W3 = 0.2. The learning rate η = 0.01, the convergence threshold ε = 0.001, and the maximum number of iterations N = 100.

[0072] Step 2: Offline training. Extract the operation data for the past 7 days, including the IAQ value, energy consumption data, and equipment failure records per hour. Group the 7-day data into groups of one hour each, and calculate the objective function J value for each group.

[0073] Objective function: minJ = 0.5×J1 + 0.3×J2 + 0.2×J3. Among them, J1 is the non-compliance rate of IAQ, and the calculation formula is J1 = 1 - compliance rate of IAQ. The compliance rate of IAQ = duration of compliance / total operation duration; IAQ < IAQ2 is regarded as compliance, IAQ2 is a preset value, and the duration when IAQ is at the safe level or warning level (introduced below) is the duration of compliance.

[0074] J2 is the energy consumption deviation term, and the calculation formula is J2 = (average energy consumption in the current period - optimal energy consumption benchmark value) / optimal energy consumption benchmark value. The optimal energy consumption benchmark value is the lowest average energy consumption in the past 30 days.

[0075] J3 is the normalized value of the equipment failure frequency, and the calculation rule is: when the failure frequency ≤ 1 time / year, J3 = 0, and J3 increases by 0.5 for each additional failure, with an upper limit of 2.

[0076] The physical meaning of the objective function J is: the smaller the J value, the higher the IAQ compliance rate, the lower the energy consumption, the fewer the equipment failure frequencies, and the better the system performance.

[0077] Step 3: Calculate the partial derivative.

[0078] Calculate the partial derivative (gradient) of the objective function J with respect to each weight, which reflects the direction of the influence of the weight change on the J value.

[0079] Partial derivative formula: ∂J / ∂W i = 0.5×( ∂J1 / ∂W i ) + 0.3×( ∂J2 / ∂W i ) + 0.2( ∂J3 / ∂W i ).

[0080] To facilitate engineering implementation, the partial derivatives of the objective function J with respect to each weight coefficient can be calculated using the small perturbation method. Specifically, given W... i Add a small perturbation ΔW = 0.01, and calculate the objective function J(W) after the perturbation. i +ΔW), then the partial derivative J / W i ≈[J(W i +ΔW)-J(W i )] / ΔW.

[0081] Substituting i=1 into the formula, we can calculate... J / W1≈[J(W1+ΔW)-J(W1)] / ΔW. Similarly, calculate... J / W2 and J / W3.

[0082] Step 4: Update the weights. Update the weight coefficients along the negative gradient direction, calculated using the formula: W i (k+1) =W i (k) -η×( J / W i ).

[0083] Substituting i=1 into the formula, we can calculate W1. (k+1) =W1 (k) -η×( J / W1).

[0084] Similarly, calculate W2 (k+1) =W2 (k) -η×( J / W2) and W3 (k+1) =W3 (k) -η×( J / W3), where k is the iteration number, and initially k=0.

[0085] Step 5: Convergence judgment. Repeat steps 3-4 until |J(k+1)-J(k)|<ε or k=N, to obtain the optimal weight coefficients.

[0086] In some embodiments, the method further includes: Step 6: Boundary constraint and normalization processing steps: To prevent any single parameter from being ignored due to excessively low weight or becoming dominant due to excessively high weight, the updated weight coefficients must satisfy the boundary constraint 0.1 ≤ W. i≤0.7. If the calculated new weight W1 (k+1) If the value is less than 0.1, then force it to be set to 0.1; if the calculated new weight W1 (k+1) If the value is greater than 0.7, then force it to be set to 0.7.

[0087] Then, normalization is performed to obtain the optimized weight coefficients, calculated using the following formula: W1'=W1 (k+1) / (W1 (k+1) +W2 (k+1) +W3 (k+1) ); W2'=W2 (k+1) / (W1 (k+1) +W2 (k+1) +W3 (k+1) ); W3'=W3 (k+1) / (W1 (k+1) +W2 (k+1) +W3 (k+1) ).

[0088] Step 7: Online Update. Update the optimized weight coefficients W1', W2', and W3' into the controller program as the weight coefficients for the next cycle.

[0089] This application can dynamically adjust the weighting coefficients based on historical operating data to adapt to different application scenarios and environmental changes. For example, when historical data shows that PM2.5 concentrations frequently exceed the standard, leading to a decline in IAQ compliance rate, the optimization algorithm will automatically increase the weight of W2, making the system focus more on PM2.5 concentration control; when historical data shows that energy consumption is high, the optimization algorithm will adjust the weighting coefficients to reduce the amount of fresh air introduced, thereby reducing energy consumption.

[0090] In some embodiments, refer to Figure 5 The Air Quality Index (IAQ) can be divided into four levels based on its segmented range: safe, warning, exceeding the standard, and mandatory intervention.

[0091] The Air Quality Index (IAQ) level is determined according to the following steps: Determine whether IAQ > IAQ1 is true. If yes, then IAQ is at the mandatory intervention level; if no, then determine whether IAQ > IAQ2 is true. If IAQ > IAQ2 is true, then IAQ is in the out-of-limit category; if IAQ > IAQ2 is not true, then determine whether IAQ > IAQ3 is true. If IAQ > IAQ3 is true, then IAQ is at the warning level; if IAQ > IAQ3 is not true, then IAQ is at the safe level.

[0092] When the Air Quality Index (IAQ) is at the mandatory intervention level, it indicates that the indoor air quality is seriously exceeding the standard and a large amount of fresh air needs to be introduced urgently; when the IAQ is at the exceeding level, it indicates that the indoor air quality is slightly exceeding the standard and the fresh air volume needs to be increased; when the IAQ is at the warning level, it indicates that the indoor air quality is close to exceeding the standard and a small amount of fresh air can alleviate the problem. In some embodiments, when the Integrated Air Quality Index (IAQ) is at a safe level, i.e., IAQ≤IAQ3, the opening of the fresh air valve can be adjusted according to the indoor and outdoor temperature and humidity.

[0093] In this application, after the opening degree of the fresh air valve is determined, the opening degree of the return air valve can be obtained based on the fact that the sum of the opening degrees of the fresh air valve and the return air valve is 100%. The sum of the opening degrees of the fresh air valve and the return air valve being 100% ensures that the airflow of the air conditioner remains constant.

[0094] When the Air Quality Index (IAQ) is at a safe level, it indicates good indoor air quality. The amount of fresh air introduced does not need to consider the impact of indoor air quality; therefore, the fresh air volume can be adjusted according to temperature and humidity requirements and dehumidification load. For example, when outdoor humidity is high, i.e., the dehumidification load is large, reducing the fresh air volume can alleviate the dehumidification load on the main heat exchanger and prevent excessive cooling of the air supplied by the air conditioner. When outdoor temperature and humidity are close to the set temperature and humidity, more fresh air can be introduced, increasing the proportion of fresh air and reducing the energy consumption of return air circulation, while also avoiding fluctuations in indoor temperature and humidity.

[0095] When the Air Quality Index (IAQ) does not reach the safe level (IAQ > IAQ3), the opening of the fresh air valve is adjusted according to the principle that the magnitude of IAQ is positively correlated with the opening degree of the fresh air valve.

[0096] Since the indoor air quality is substandard at this time, and may even cause discomfort to the occupants, it is necessary to prioritize improving indoor air quality by increasing the amount of fresh air. The higher the IAQ value, the worse the indoor air quality, and therefore the greater the amount of fresh air required. The opening of the fresh air valve can be appropriately increased.

[0097] In some embodiments, a one-to-one correspondence is established between air quality levels and minimum guaranteed fresh air opening rates: the minimum guaranteed fresh air opening rate is 100% for the mandatory intervention level; Qbase1 is the minimum guaranteed fresh air opening rate for the exceeding standard level; Qbase2 is the minimum guaranteed fresh air opening rate for the warning level; and Qbase3 is the minimum guaranteed fresh air opening rate for the safe level. Qbase1 > Qbase2 > Qbase3. The minimum guaranteed opening rate values ​​can be preset and changed by the user according to the application scenario. For example, Qbase1 > 80%, Qbase2 > 60%, and Qbase3 > 20%.

[0098] In some embodiments, when IAQ > IAQ1, the fresh air valve is fully open and the return air valve is fully closed.

[0099] When IAQ > IAQ1, the indoor air quality is at the mandatory intervention level, requiring the introduction of a large amount of fresh air to improve the indoor air quality. At this time, the fresh air valve is fully open.

[0100] In some embodiments, when IAQ3 < IAQ ≤ IAQ1, the minimum fresh air guarantee opening is determined based on the lower endpoint of IAQ relative to the IAQ level range, according to the minimum fresh air guarantee opening corresponding to the IAQ level. n The degree of deviation should be adjusted accordingly to increase the opening degree of the fresh air valve.

[0101] The aperture increment can be calculated as follows: IAQ to IAQ n The percentage increase multiplied by the weighting coefficient corresponding to the IAQ range is the increment of the fresh air valve opening. Specifically, when IAQ2 < IAQ ≤ IAQ1, the IAQ is in the excess level, and the lower end of the level range is IAQ. n =IAQ2, the opening degree Qf of the fresh air valve is adjusted as follows: Qf=Qbase1+(IAQ-IAQ2) / IAQ2×β1; where Qbase1 is the minimum fresh air guarantee opening degree corresponding to the over-standard level, and β1 is the weighting coefficient; β1 is an empirical value or can be obtained from experimental data.

[0102] When IAQ3 < IAQ ≤ IAQ2, IAQ is at the warning level, and the lower limit of the level interval is IAQ. n =IAQ3, the opening degree Qf of the fresh air valve is adjusted as follows: Qf=Qbase2+(IAQ-IAQ3) / IAQ3×β2; Qbase2 is the minimum fresh air guarantee opening degree corresponding to the warning level, and β2 is the weighting coefficient; β2 is an empirical value or can be obtained from experimental data.

[0103] In some embodiments, β1 > β2, and the higher the IAQ value, the greater the increase in the opening degree of the fresh air valve, so as to quickly reduce the IAQ value by increasing the fresh air volume.

[0104] In some embodiments, when IAQ2 < IAQ ≤ IAQ1, Qf = Qbase1 + (IAQ - IAQ2) / IAQ2 × β1 and Qf ∈ [Qbase1, 100%]. When Qf calculated according to the formula is greater than 100%, Qf takes the value 100%.

[0105] When IAQ3 < IAQ ≤ IAQ2, Qf = Qbase2 + (IAQ - IAQ3) / IAQ3 × β2 and Qf ∈ [Qbase2, γ1], where γ1 is the upper limit of Qf, for example, γ1 = 80%. When Qf calculated according to the formula is greater than 80%, Qf takes the value of 80%.

[0106] In some embodiments, when the IAQ is at the safety level, if the outdoor temperature and humidity are lower than the indoor temperature and humidity and the difference between the two is not greater than a preset value, the opening of the fresh air valve is increased based on the minimum fresh air guarantee opening Qbase3 corresponding to the safety level.

[0107] Under these conditions, the temperature and humidity of the outdoor fresh air are relatively suitable, so more outdoor fresh air can be introduced, increasing the proportion of fresh air and decreasing the proportion of return air. This can reduce return air circulation losses and avoid fluctuations in temperature and humidity.

[0108] In some embodiments, when the outdoor temperature and humidity are lower than the indoor temperature and humidity and the difference between the two is not greater than a preset value, the opening increment of the fresh air valve can be obtained by weighted summation of the difference between the indoor humidity and the set humidity, and the difference between the indoor temperature and the set temperature. For example, the preset temperature difference ΔT is 2℃, and the preset humidity value ΔRH is 10%. When Tf < Ti, RHf < RHi, |Tf-Ti| ≤ 2℃, and |RHf-RHi| ≤ 10%, the opening of the fresh air valve Qf = Qbase3 + k1 × (RHi-RHset) + k2 × (Ti-Tset); where Tf is the outdoor temperature value, Ti is the indoor temperature value, RHf is the outdoor relative humidity value, RHi is the indoor relative humidity value, RHset is the set target humidity, Tset is the set target temperature, k1 is the humidity weighting coefficient, and k2 is the temperature weighting coefficient.

[0109] Where K1 > K2, the humidity deviation has a greater impact on the opening of the damper than the temperature deviation. For example, K1 = 1.2~1.8 and K2 = 0.6~1.0.

[0110] In this application, under the premise that the air quality meets the standards, the fresh air intake is dynamically adjusted according to the indoor temperature and humidity deviation. When the indoor humidity is higher than the set value, or the temperature is higher than the set value, the fresh air intake is increased to assist in dehumidification and cooling.

[0111] In some embodiments, when the outdoor temperature and humidity are lower than the indoor temperature and humidity and the difference between the two is not greater than a preset value, an upper limit value is set for the opening of the fresh air valve, i.e., Qf∈[Qbase3,γ2]. For example, γ2=60%, and when Qf calculated according to the formula is greater than 60%, Qf takes the value of 60%.

[0112] In some embodiments, when the IAQ is at the safety level, if the outdoor humidity is greater than the indoor humidity and the difference between the two is greater than the preset humidity value, the opening of the fresh air valve is reduced based on the minimum fresh air guarantee opening Qbase3 corresponding to the safety level.

[0113] Under these conditions, when the outdoor fresh air humidity load is high, reducing the introduction of high-humidity fresh air can lower the dehumidification load of the main heat exchanger, avoid excessive cooling, and achieve energy saving.

[0114] In some embodiments, when the outdoor humidity is greater than the indoor humidity and the difference between the two is greater than a preset humidity value, the reduction in the opening degree of the fresh air valve is obtained by weighted summation of the differences between the outdoor and indoor humidity. For example, the preset humidity value ΔRH is 10%. When RHf-RHi > 10%, the opening degree of the fresh air valve Qf = Qbase3 - k3 × (RHf-RHi), where k3 is the dehumidification load weighting coefficient, and for example, k3 = 1.5~2.5.

[0115] In this application, the greater the humidity difference between indoors and outdoors, the greater the reduction in the opening degree of the fresh air valve. Therefore, the proportion of fresh air can be reduced, thereby lowering the dehumidification load. Under the premise that the air quality meets the standards, by coupling the indoor and outdoor temperature and humidity difference with the dehumidification load status, the ratio of fresh air valve to return air valve is dynamically optimized to achieve synergistic optimization of IAQ protection, isothermal accuracy control, and energy saving.

[0116] In some embodiments, when the outdoor humidity is greater than the indoor humidity and the difference between the two is greater than a preset humidity value, a lower limit value is set for the opening of the fresh air valve, i.e., Qf∈[γ3, Qbase3]. For example, γ3=20%, and when Qf calculated according to the formula is less than 20%, Qf takes the value of 20%.

[0117] In some embodiments, the weight coefficients k1, k2, and k3 are adaptively adjusted using a machine learning algorithm.

[0118] The coefficient values ​​are optimized based on historical operating data (energy consumption, isothermal accuracy, and IAQ compliance rate). The specific method is as follows: establish a multiple regression model of energy consumption, isothermal accuracy, IAQ compliance rate, and k1, k2, and k3, and obtain the optimal coefficient values ​​by fitting the model using the least squares method.

[0119] In some embodiments, when the IAQ is at a safe level, if the outdoor humidity is greater than the indoor humidity and the difference between the two is not greater than a preset humidity value, the opening degree of the fresh air valve is the minimum fresh air guarantee opening degree Qbase3 corresponding to the safe level. Under this condition, if the outdoor humidity is slightly higher, the opening degree of the fresh air valve can be fixed at Qbase3.

[0120] In some embodiments, when a fault is detected in any sensor in the sensor module, a safety fallback strategy is executed: the fresh air valve is fixed at the minimum fresh air guarantee opening Qbase under the corresponding air quality level, the return air valve is fixed at 100%-Qbase, and an alarm signal is output.

[0121] The sensor fault detection method is as follows: if the output value of a sensor exceeds its range for 10 consecutive seconds (e.g., CO2 sensor output value > 5000 ppm or < 0 ppm), or if the output value remains unchanged for 10 consecutive seconds (indicating sensor failure), then the sensor is considered faulty. The purpose of the safety rollback strategy is to ensure that the system continues to operate and maintains a basic ventilation volume in the event of a sensor failure, thus avoiding system shutdown due to sensor failure.

[0122] As can be seen from the above description, by establishing a multi-parameter coupled IAQ assessment model, and using a normalization + scenario-based weighting approach to integrate multiple pollutant parameters such as CO2, PM2.5, and VOC into a single assessment index, and combining it with a graded priority control strategy, the priority confusion problem caused by the single-parameter triggering mode in the existing technology is solved, achieving an IAQ compliance rate of ≥98%, and effectively avoiding the failure of synergistic optimization when air quality and temperature and humidity regulation conflict.

[0123] In addition, by using a dynamic ratio algorithm to couple IAQ level, indoor and outdoor temperature and humidity difference and dehumidification load status to calculate the damper opening, and combining it with a weighted adaptive optimization algorithm to dynamically adjust the weight coefficients based on historical operating data, the problem of low adjustment accuracy caused by fixed or linear adjustment of damper opening in existing technologies is solved.

[0124] In addition, by optimizing the valve ratio and the coordinated control mechanism of the main and auxiliary heat exchangers, the valve ratio is optimized to improve the isothermal accuracy, reduce the adjustment burden of the heat exchangers, solve the problem of lack of coordination caused by the disconnect between valve adjustment and heat exchangers in the existing technology, and significantly improve the system reliability.

[0125] In addition, it supports customizing initial weights and dynamically optimizing them according to different application scenarios, achieving compliance in all application scenarios such as precision electronics workshops, cultural relic warehouses, laboratories, and ordinary offices, significantly improving its versatility.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0127] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A control method of an air conditioner, characterized by, The air conditioner includes: The casing has a return air inlet and a fresh air inlet, wherein the return air inlet is used to introduce indoor air into the casing and the fresh air inlet is used to introduce outdoor air into the casing. The fan is located inside the casing; A heat exchanger is used to exchange heat with the air driven by the fan; the heat exchanger includes a main heat exchanger and an auxiliary heat exchanger. In the isothermal dehumidification mode, the auxiliary heat exchanger is used as a condenser to heat the air after it has been cooled and dehumidified by the main heat exchanger. Fresh air valve, used to control the amount of outdoor air introduced; Return air valve, used to control the amount of indoor air introduced; The control method includes: It measures indoor and outdoor temperature and humidity levels, as well as various indoor air quality parameters. The combined air quality index (IAQ) is obtained by coupling multiple air quality parameters. Adjust the opening degree of the fresh air valve and return air valve according to the air quality index (IAQ) level and the indoor and outdoor temperature and humidity values.

2. The control method of the air conditioner according to claim 1, characterized by, The specific steps for coupling multiple air quality parameters to obtain the composite air quality index (IAQ) include: Normalization of each air quality parameter yields the corresponding normalized pollution index; Based on the scenario-based weighting coefficients of each indoor air quality parameter, the normalized pollution index is weighted and summed to obtain the comprehensive air quality index (IAQ).

3. The control method of the air conditioner according to claim 2, characterized by The control method further includes adaptive optimization of weight coefficients; The steps of adaptive optimization of weight coefficients include: An objective function is established based on the IAQ value, energy consumption data, and failure frequency in historical operating data, and the weight coefficients are updated iteratively by minimizing the objective function.

4. The control method for an air conditioner according to claim 3, characterized in that, The steps of adaptive optimization of weight coefficients also include: applying boundary constraints and normalization to the iteratively updated weight coefficients to obtain optimized weight coefficients.

5. The control method for an air conditioner according to any one of claims 1-4, characterized in that, The specific steps for adjusting the opening of the fresh air valve and return air valve according to the Air Quality Index (IAQ) level and indoor and outdoor temperature and humidity values ​​include: Determine if IAQ≤IAQ3 is true. If yes, then IAQ is at a safe level, and adjust the opening of the fresh air valve according to the indoor and outdoor temperature and humidity. If no, adjust the opening of the fresh air valve according to the principle that the size of IAQ is positively correlated with the opening of the fresh air valve. The opening degree of the return air valve is obtained by calculating that the sum of the opening degree of the fresh air valve and the opening degree of the return air valve equals 100%.

6. The control method for an air conditioner according to claim 5, characterized in that, The specific steps for adjusting the opening of the fresh air valve based on the principle that the size of the IAQ is positively correlated with the opening degree of the fresh air valve include: When IAQ > IAQ1, the fresh air valve is fully open; When IAQ3 < IAQ ≤ IAQ1, based on the minimum fresh air guarantee opening corresponding to the IAQ level, the opening of the fresh air valve is increased accordingly based on the degree of deviation of IAQ from the lower endpoint IAQn of the IAQ level range. There is a pre-defined one-to-one correspondence between the air quality level and the minimum fresh air supply level.

7. The control method for an air conditioner according to claim 6, characterized in that, When IAQ3 < IAQ ≤ IAQ1, the percentage increase of IAQ over IAQn multiplied by the weighting coefficient corresponding to the interval of IAQ is the opening increment of the fresh air valve.

8. The control method for an air conditioner according to claim 5, characterized in that, When IAQ is at a secure level When the outdoor temperature and humidity are lower than the indoor temperature and humidity and the difference between the two is not greater than the preset value, the opening of the fresh air valve is increased based on the minimum fresh air guarantee opening corresponding to the safety level. When the outdoor humidity is greater than the indoor humidity and the difference between the two is greater than the preset humidity value, the opening of the fresh air valve is reduced based on the minimum fresh air guarantee opening corresponding to the safety level. When the outdoor humidity is greater than the indoor humidity and the difference between the two is not greater than the preset humidity value, the opening degree of the fresh air valve is the minimum fresh air guarantee opening degree corresponding to the safety level.

9. The control method for an air conditioner according to claim 8, characterized in that, When the outdoor temperature and humidity are lower than the indoor temperature and humidity and the difference between the two is not greater than the preset value, the opening increment of the fresh air valve is obtained by weighted summation of the difference between the indoor humidity and the set humidity, and the difference between the indoor temperature and the set temperature. When the outdoor humidity is greater than the indoor humidity and the difference between the two is greater than the preset humidity value, the reduction in the opening of the fresh air valve is obtained by weighting the difference between the outdoor humidity and the indoor humidity.

10. An air conditioner, characterized in that, include: The casing has a return air inlet and a fresh air inlet, wherein the return air inlet is used to introduce indoor air into the casing and the fresh air inlet is used to introduce outdoor air into the casing. The fan is located inside the casing; A heat exchanger is used to exchange heat with the air driven by the fan; the heat exchanger includes a main heat exchanger and an auxiliary heat exchanger. In the isothermal dehumidification mode, the auxiliary heat exchanger is used as a condenser to heat the air after it has been cooled and dehumidified by the main heat exchanger. Fresh air valve, used to control the amount of outdoor air introduced; Return air valve, used to control the amount of indoor air introduced; Temperature and humidity sensor module, used to collect indoor and outdoor temperature and humidity values; An air quality sensor module is used to collect values ​​of various indoor air quality parameters; The controller is configured as follows: The temperature and humidity values ​​collected by the temperature and humidity sensor module, as well as the values ​​of various air quality parameters collected by the air quality sensor module, are obtained. The combined air quality index (IAQ) is obtained by coupling multiple indoor air quality parameters. Adjust the opening degree of the fresh air valve and return air valve according to the air quality index (IAQ) level and the indoor and outdoor temperature and humidity values.

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