A fresh air intelligent control system based on multi-air outlet coordination

Abstract

The present invention belongs to the technical field of fresh air control, and specifically discloses a fresh air intelligent control system based on the coordination of multiple air outlets, including: an air outlet information integration module, an environmental information monitoring module, an air outlet mode confirmation module, an air outlet control judgment module, a database and an air outlet control confirmation module. The present invention effectively solves the problem that the current air outlet control method is not suitable for large-scale venue control by considering the coordination and cooperation of multiple air outlets to confirm the air outlet mode, fully considers the influence of the corresponding air outlet state of air outlets in different positions on the overall fresh air effect, avoids the one-sidedness and singularity of the current integrated control, improves the flexibility and adaptability of the fresh air system setting, and significantly improves the energy saving rate of the fresh air system. At the same time, the air outlet mode is confirmed by combining the temperature conditions and carbon dioxide concentration conditions of each air outlet area, which makes up for the shortcomings of the current air outlet setting.

Description

Technical Field

[0001] The present invention belongs to the technical field of fresh air control, and specifically relates to a fresh air intelligent control system based on the coordination of multiple air outlets. Background Art

[0002] As people's requirements for indoor air quality are getting higher and higher, the fresh air system, as a device that can effectively improve indoor air quality, has received widespread attention. The fresh air system can introduce outdoor fresh air into the room after filtering and purification, and at the same time discharge the indoor polluted air to the outside, so as to achieve continuous renewal of indoor air.

[0003] The prior art discloses a precisely controllable fresh air unit and control method disclosed in the Chinese invention patent application with application publication number CN111637574A. The fresh air unit includes a fresh air casing with a housing chamber. The fresh air casing is provided with a fresh air inlet and a fresh air outlet on two opposite sides along the air flow direction. The housing chamber is provided with a filter assembly, a fan, a heat pipe heat exchange assembly, a surface cooler and a thermostatic coil. The heat pipe heat exchange assembly is a U-shaped structure, and the medium inside the heat pipe heat exchange assembly circulates by gravity. The heat pipe heat exchange assembly includes a heat pipe precooling section, a surface cooler section and a heat pipe reheating section. The heat pipe precooling section and the heat pipe reheating section are connected by a pipeline cycle. The medium circulates, evaporates in the heat pipe precooling section, and condenses in the heat pipe reheating section. The surface cooler is provided between the heat pipe precooling section and the heat pipe reheating section. Branch pipes are provided on the water inlet pipe and the water outlet pipe of the surface cooler. A valve and a capillary for controlling the flow are provided on the inlet pipe of the thermostatic coil. The invention has low energy consumption and is easy to operate.

[0004] Another example of the prior art is a control method, control device and fresh air system for a fresh air system disclosed in a Chinese invention patent application with application publication number CN118517763A, in which a fresh air fan of the fresh air system is connected to at least two rooms, each room is provided with an air supply port and an air return port, and all air supply ports and all air return ports are provided with air valves with adjustable openings. The control method includes: obtaining environmental parameters in each room. According to the environmental parameters of each room, the opening of the air supply port and the air return port in the room is adjusted, and the speed of the fresh air fan is adjusted. This method obtains the environmental parameters in each room based on sensors in each room, and further determines the presence and stay of people in the room through changes in environmental parameters, and then adjusts the opening and closing of the air supply port and the air return port in each room, as well as the speed of the fresh air fan, accurately determines the fresh air demand in each room, and achieves targeted and precise control of each room.

[0005] Regarding the above two technical solutions, it is obvious that the current fresh air control is mainly carried out in an integrated manner according to the fresh air demand, but there are still the following deficiencies: 1. It is not suitable for the control of large places, and the influence of the corresponding air outlet status of air outlets in different positions on the overall fresh air effect is not considered. At the same time, the current control belongs to the integrated control, and the energy saving rate is not significantly improved.

[0006] 2. The air outlet settings are not targeted enough, resulting in better exhaust effects in some areas and poorer exhaust effects in other areas, and thus unable to guarantee the overall fresh air effect. This unbalanced exhaust distribution not only affects the consistency of indoor air quality, but may also lead to energy waste. At the same time, it also fails to improve the fresh air efficiency and the uniformity of the indoor environment. Summary of the invention

[0007] In view of this, in order to solve the problems raised in the above background technology, a fresh air intelligent control system based on multi-air outlet coordination is proposed.

[0008] The objective of the present invention can be achieved through the following technical solutions: The present invention provides a fresh air intelligent control system based on the coordination of multiple air outlets, including: an air outlet information integration module, which is used to import the spatial volume of the target area, the number of air outlets arranged, and the current air outlet settings of each air outlet, installation location information and air outlet record log, and summarize the air outlet setting information set.

[0009] The environmental information monitoring module is used to monitor the internal environment in each air outlet area and integrate the internal environment monitoring information, while monitoring the external environment to obtain the external environment monitoring information.

[0010] The air outlet mode confirmation module is used to confirm the current air outlet mode, which includes the overall mode and the local mode.

[0011] The air outlet control judgment module is used to judge whether to perform air outlet control based on the air outlet mode. If the judgment result is to perform air outlet control, the air outlet setting control module is started. If the judgment result is not to perform air outlet control, the corresponding air outlet is performed according to the current air outlet setting.

[0012] The database is used to store suitable indoor temperatures and suitable indoor carbon dioxide concentrations, and to store reference exhaust frequencies corresponding to the deviations of various internal environment adjustment degrees.

[0013] The air outlet control confirmation module is used to confirm the control air outlet and the control air outlet settings of each control air outlet, and perform corresponding air outlet.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention effectively solves the problem that the current air outlet control method is not suitable for large-scale venue control by considering the coordination and cooperation of multiple air outlets to determine the air outlet mode. It fully considers the influence of the corresponding air outlet status of air outlets in different positions on the overall fresh air effect, avoids the one-sidedness and singleness of the current integrated control, improves the flexibility and adaptability of the fresh air system setting, and significantly improves the energy saving rate of the fresh air system.

[0015] (2) The present invention determines the air outlet mode in combination with the environmental status of each air outlet area, fully considers the environmental status of different air outlets, makes up for the shortcomings of the current air outlet settings, and avoids the occurrence of unbalanced exhaust such as better exhaust effects in some areas and poor exhaust effects in other areas as much as possible, effectively guarantees the overall fresh air effect, and at the same time ensures the consistency of air quality in the entire area, avoids the waste of resources, and at the same time improves the fresh air efficiency and the uniformity of the indoor environment.

[0016] (3) The present invention sets the trigger conditions for the overall air outlet by combining multiple factors such as the uneven temperature distribution in the vertical plane, the uneven overall temperature distribution, the uneven carbon dioxide concentration distribution, and the temperature difference and the carbon dioxide concentration difference. It not only takes into account the temperature stratification but also takes into account the environmental distribution law of the entire space. It can more accurately judge the indoor air quality status, thereby ensuring the accuracy of the air outlet mode setting, facilitating more effective use of ventilation resources, and improving the efficiency of the ventilation system and the comfort of the indoor environment.

[0017] (4) The present invention sets the reference air volume at the temperature difference level by combining the temperature difference, the temperature change rate and the temperature difference, thereby more accurately judging the indoor temperature condition and breaking the limitation of setting the air volume only from a single temperature difference level. At the same time, it also paves the way for the subsequent control of the air outlet and confirmation of the control air outlet settings of each control air outlet, thereby controlling the air volume in a more quantitative and targeted manner, improving the effectiveness and efficiency of exhaust, and avoiding energy waste caused by excessive exhaust, thereby saving energy costs.

[0018] (5) When calculating the appropriate exhaust frequency of the air outlet, the present invention sets the wind direction interference factor by considering the influence of the external wind speed and wind direction on the exhaust air, so as to more accurately judge the expected exhaust situation of the air outlet, thereby ensuring the rationality and adaptability of the exhaust frequency setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the connection of the system modules of the present invention.

[0021] Figure 2 The figure is a schematic flow chart of the overall implementation steps of the method of the present invention.

[0022] Figure 3 The figure is a schematic diagram of the implementation steps of the air outlet control judgment module of the present invention.

[0023] Figure 4 This is a schematic diagram of the air outlet layout of the present invention.

[0024] Figure numerals: 1. wall, 2. ventilation duct, 3. air outlet, the shaded area of ​​the air outlet represents the air outlet grid, and the direction of the arrow is the internal direction of the air outlet area. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 , Figure 2 and Figure 4 As shown, the present invention provides a fresh air intelligent control system based on multi-air outlet coordination, including: an air outlet information integration module, an environmental information monitoring module, an air outlet mode confirmation module, an air outlet control judgment module, a database and an air outlet control confirmation module.

[0027] In the above, the environmental information monitoring module is connected to the air outlet information integration module and the air outlet mode confirmation module respectively, the air outlet mode confirmation module is connected to the air outlet control judgment module and the database respectively, and the air outlet control judgment module is also connected to the database and the air outlet control confirmation module respectively.

[0028] The air outlet information integration module is used to import the spatial volume of the target area, the number of air outlets arranged, the current air outlet settings of each air outlet, the installation location information and the air outlet record log, and summarize them to obtain an air outlet setting information set.

[0029] Specifically, the current air outlet settings include but are not limited to the opening state, the current air outlet volume and the current exhaust frequency.

[0030] The environmental information monitoring module is used to monitor the internal environment in each air outlet area and integrate to obtain internal environment monitoring information, and simultaneously monitor the external environment to obtain external environment monitoring information.

[0031] Specifically, the internal environment monitoring information includes the monitored temperature and monitored carbon dioxide concentration of each air outlet area corresponding to each monitoring time point. The external environment monitoring information includes the wind direction and wind direction at each monitoring time point.

[0032] It should be added that the temperature is monitored by temperature sensors installed in each air outlet area, the humidity is monitored by humidity sensors installed in each air outlet area, and the wind speed and wind direction are monitored by an anemometer installed outside the area.

[0033] The air outlet mode confirmation module is used to confirm the current air outlet mode, and the air outlet mode includes an overall mode and a local mode.

[0034] Specifically, confirming the current air outlet mode includes: A1, extracting the monitoring temperature of each air outlet area corresponding to the current monitoring time point from the internal environment monitoring information, and screening out the highest monitoring temperature, and calculating the average value of the corresponding monitoring temperature of each air outlet area, calculating the average value of the highest monitoring temperature and the average value of the monitoring temperature, and taking the calculation result as the target internal temperature, recorded as .

[0035] It should be added that the highest monitored temperature represents the peak value of the indoor temperature, while the average value represents the overall level of the indoor temperature. Taking the average of the two as the target internal temperature can take into account both extreme temperatures and overall temperature levels to a certain extent, avoiding the error of only considering the average temperature or the extreme temperature. Similarly, the highest monitored carbon dioxide concentration represents the lowest level of indoor air quality, while the average value represents the overall air quality level. Taking the average of the two as the target internal carbon dioxide concentration can take into account both extreme values ​​and overall levels to a certain extent, making the subsequent wind mode confirmation results more reliable and reasonable.

[0036] A2. Extract the monitored carbon dioxide concentration of each outlet area corresponding to the current monitoring time point from the internal environment monitoring information, and The confirmation method is similar to confirming the target internal carbon dioxide concentration, recorded as .

[0037] A3. Extract the suitable indoor temperature and suitable indoor carbon dioxide concentration from the database and record them as and .

[0038] A4. Define the reference first indoor temperature difference and the reference first indoor carbon dioxide concentration difference as and , set the trigger conditions for the overall air output, and determine whether any of the trigger conditions are met.

[0039] A5. If it exists, select the overall mode as the current air outlet mode; otherwise, select the local mode as the current air outlet mode.

[0040] The embodiment of the present invention effectively solves the problem that the current air outlet control method is not suitable for large-scale venue control by considering the coordination and cooperation of multiple air outlets to determine the air outlet mode. It fully considers the influence of the corresponding air outlet states of air outlets in different positions on the overall fresh air effect, avoids the one-sidedness and singleness of the current integrated control, improves the flexibility and adaptability of the fresh air system setting, and significantly improves the energy saving rate of the fresh air system.

[0041] The embodiment of the present invention also determines the air outlet mode in combination with the environmental status of each air outlet area, fully considers the environmental status of different air outlets, makes up for the shortcomings of the current air outlet settings, and avoids the occurrence of unbalanced exhaust such as better exhaust effect in some areas and poor exhaust effect in other areas as much as possible, effectively guarantees the overall fresh air effect, and at the same time ensures the consistency of air quality in the entire area, avoids the waste of resources, and improves the fresh air efficiency and the uniformity of the indoor environment.

[0042] Furthermore, regarding the trigger conditions for setting the overall air outlet in step A4, it includes: A41, extracting the installation height from the installation position information, comparing the installation heights of each air outlet, deduplicating the same installation height, and using the remaining air outlets after deduplication as reference air outlets.

[0043] A42. Calculate the standard deviation of the monitored temperature in each reference outlet area as the vertical temperature distribution unevenness At the same time, the standard deviation of the monitored temperature and the monitored carbon dioxide concentration corresponding to each outlet area is calculated and recorded as the overall temperature distribution unevenness and the uneven distribution of carbon dioxide concentration .

[0044] A43, will and or and As a trigger condition, and They are the vertical plane temperature distribution unevenness and temperature distribution unevenness of the reference set respectively.

[0045] A44, will and As the second trigger condition, In order to set the reference carbon dioxide concentration distribution unevenness, trigger condition 1 and trigger condition 2 are used as the trigger conditions of the overall mode.

[0046] It should be added that when the temperature difference in the room is not particularly large, the air can be distributed more evenly throughout the space by adjusting the air volume and wind speed as a whole. When the temperature in some areas of the room is significantly higher or lower than other areas, local regulation can more specifically solve these hot or cold spot problems. Therefore, when the temperature unevenness is less than the set value, select the adaptive overall air outlet mode.

[0047] It should also be added that when the indoor carbon dioxide concentration difference is greater than the set reference first indoor carbon dioxide concentration difference, the indoor air condition has become obviously poor at this time, especially when the carbon dioxide distribution is relatively uniform, the overall indoor air condition is poor. Therefore, the indoor carbon dioxide concentration difference is greater than the set reference first indoor carbon dioxide concentration difference, and the carbon dioxide concentration distribution unevenness is less than or equal to the set reference carbon dioxide concentration distribution unevenness as the second trigger condition.

[0048] It is understandable that when the indoor temperature difference is greater than the set first indoor temperature difference threshold, it indicates that the indoor temperature is obviously unbalanced and needs to be adjusted to a greater extent, especially when the overall temperature distribution is relatively uniform and the temperature distribution on the vertical level is relatively uniform. Only local adjustments require more energy consumption and longer air circulation, which makes it impossible to significantly reduce energy consumption and quickly achieve indoor air replacement. Therefore, when setting trigger condition one, not only the indoor temperature difference is considered, but also the overall temperature distribution uniformity and the vertical temperature distribution uniformity.

[0049] It is also understandable that the uniformity of temperature distribution on the vertical plane reflects whether there is temperature stratification at present. If there is obvious temperature stratification, the indoor temperature difference may be significantly larger due to the temperature stratification. Therefore, when considering whether the temperature is evenly distributed, it is also necessary to consider whether there is temperature stratification when considering whether the overall distribution is even.

[0050] In a specific embodiment, The specific value can be 3℃. The specific value can be 2℃. The specific value can be 3℃. The specific value can be 100ppm. The value can be 50ppm.

[0051] For example, assuming that in a large conference hall, the temperature difference between different areas is 5°C, which exceeds the set first indoor temperature difference threshold of 3°C, and the overall distribution unevenness is 1.2°C, which is less than the set reference temperature distribution unevenness threshold of 2°C. At this time, trigger condition 1 is activated, and the overall air outlet mode of the large conference hall is activated.

[0052] Similarly, in a large conference hall, the difference in carbon dioxide concentration in different areas is 150ppm, which exceeds the set first indoor carbon dioxide concentration difference threshold of 100ppm, and the uneven distribution of carbon dioxide concentration is 45ppm, which is less than the set reference carbon dioxide concentration uneven distribution of 50ppm. At this time, trigger condition two is also activated, and the overall air outlet mode of the large conference hall is activated, that is, when trigger condition one or trigger condition two is activated, the overall air outlet mode of the large conference hall is activated accordingly.

[0053] The embodiment of the present invention sets the trigger conditions for the overall air outlet by combining multiple factors such as the uneven temperature distribution in the vertical plane, the uneven overall temperature distribution, the uneven carbon dioxide concentration distribution, the temperature difference and the carbon dioxide concentration difference. It not only takes into account the temperature stratification but also takes into account the environmental distribution law of the entire space. It can more accurately judge the indoor air quality status, thereby ensuring the accuracy of the air outlet mode setting, facilitating more effective use of ventilation resources, and improving the efficiency of the ventilation system and the comfort of the indoor environment.

[0054] The air outlet control judgment module is used to judge whether to perform air outlet control based on the air outlet mode. If the judgment result is to perform air outlet control, the air outlet setting control module is started. If the judgment result is not to perform air outlet control, the corresponding air outlet is performed according to the current air outlet setting.

[0055] Specifically, see Figure 3 As shown, judging whether to perform air outlet control includes: extracting the current air outlet mode.

[0056] If it is the overall mode, the opening status is extracted from the current air outlet setting to determine whether the opening status of each air outlet is on. If not, the air outlet control is performed as the judgment result. Otherwise, the appropriate air volume of the air outlet and the appropriate exhaust frequency of the air outlet are calculated.

[0057] The current air volume and the current exhaust frequency are extracted from the current air outlet settings.

[0058] The difference between the current air volume and the appropriate air volume is recorded as the air volume difference, and the difference between the current exhaust frequency and the appropriate exhaust frequency is recorded as the exhaust frequency difference.

[0059] It is determined whether the air volume difference or exhaust frequency difference of each air outlet is within the corresponding set difference range. If so, no air outlet control is performed as the judgment result. Otherwise, air outlet control is performed as the judgment result.

[0060] If it is a local mode, determine whether the opening status of each air outlet is consistent. If so, the air outlet control will be used as the judgment result. Otherwise, calculate the consistency of the comprehensive setting of the air outlet.

[0061] When the comprehensive setting consistency of the air outlet is greater than the set reference setting consistency, the air outlet control will not be performed as a judgment result, otherwise, the air outlet control will be performed as a judgment result.

[0062] It should be added that the specific value of the reference setting consistency can be set to 0.8.

[0063] It should also be added that the setting difference range corresponding to the air volume difference or the exhaust frequency difference varies depending on the application scenario. Generally, the setting difference range of the air volume difference or the exhaust frequency difference should be within ±10% of the appropriate air volume or the appropriate exhaust frequency.

[0064] Furthermore, the above calculation of the appropriate air volume of the air outlet includes: B1, extracting the indoor temperature difference, recorded as , and the spatial volume of the target area is recorded as .

[0065] B2. Extract the monitoring temperature of each air outlet area corresponding to each monitoring time point from the internal environment monitoring information, construct the temperature change curve corresponding to each air outlet area with time as the horizontal axis and the monitoring temperature as the vertical axis, and extract the slope from it as the temperature change rate.

[0066] B3. Calculate the standard deviation of the monitored temperature at each monitoring time point in the same air outlet area, and use the calculation result as the temperature difference.

[0067] B4. Calculate the mean of the temperature change rate and temperature difference of each outlet area, and record the calculation results as and .

[0068] B5. Calculate the reference air volume at the temperature difference level ,

[0069] , To set the reference indoor temperature difference, is a natural constant, is the reference temperature change rate, The number of air outlets.

[0070] B6. According to The calculation method is similar to that of the reference air volume at the carbon dioxide concentration difference level, which is recorded as ,from and The maximum value is selected as the appropriate air volume of the outlet.

[0071] It should be added that the temperature difference is the difference between the required indoor temperature and the current actual temperature. According to the principles of thermodynamics, the transfer of heat is related to the temperature difference and the heat transfer coefficient. Therefore, the effect of the temperature difference on the air volume is calculated by combining the heat transfer related formula to calculate the air volume at the temperature difference level. The specific reference formula is: , is the heat transfer rate, is the constant pressure specific heat capacity of air, , is the air density, , is the volume of space.

[0072] In actual situations, when the air flow rate of an air conditioning or ventilation system is calculated, it is usually to reduce the indoor temperature, that is, when the temperature difference is positive, the above heat transfer rate formula considers It is a positive value. Therefore, when only the temperature difference and the space volume are considered, and the temperature difference is small, the air volume That is, when the temperature change rate is slow and tends to be stable and the temperature difference is small, the space volume can be directly defined to be equal to the required air volume.

[0073] It needs to be explained that from the perspective of heat transfer, on the one hand, according to the formula , when only considering the temperature difference affecting heat transfer, a certain amount of air is needed to complete the heat transfer. If you imagine this process as a heat balance regulation in a space, when a temperature difference exists, there needs to be enough air flow to take away excess heat or bring in missing heat to reach the required temperature. The space volume here represents the size of the entire area that needs to be heat regulated. On the other hand, the air volume represents the volume of air passing through a certain section per unit time. When only considering the temperature difference, in order to quickly and effectively adjust the temperature, in theory, the air in the entire space needs to participate in the heat exchange process within a certain period of time. If the air volume is equal to the space volume, it means that the air in the entire space has been updated and heat exchanged once per unit time. This is a relatively ideal state for quickly reaching thermal equilibrium. Therefore, when only considering the temperature difference, the air volume can be preliminarily considered to be equal to the space volume.

[0074] To sum up, when the temperature difference is small, a small amount of exhaust can meet the fresh air demand, so the impact of temperature changes is not considered. When the temperature difference is large, the impact of temperature changes needs to be considered to predict the subsequent actual temperature conditions and improve the accuracy of the air outlet design.

[0075] Understandably, ,in, is the temperature change interference factor, and its value range is [0, 1). When , it means that the temperature change is within the permitted range, and the temperature change interference factor tends to 0. When the temperature change interference factor is assigned a value of 0 to ensure the consistency of the analysis results, the standard deviation calculation results reflect the unevenness of temperature at different times. Therefore, the two aspects of unevenness and change slope are comprehensively considered to achieve a comprehensive evaluation of temperature changes, thereby ensuring the authenticity and reliability of the temperature change analysis results.

[0076] In a specific embodiment, The specific reference value interval is [0, 1, 0.3]. For example, The value may be 0.15, and illustratively, The specific value can be 10℃.

[0077] The embodiment of the present invention sets the reference air volume at the temperature difference level in combination with the temperature difference, the temperature change rate, and the temperature difference, thereby more accurately judging the indoor temperature conditions, breaking the limitation of setting the air volume only from a single temperature difference level, and also paving the way for subsequent regulating the air outlet and confirming the regulating air outlet settings of each regulating air outlet, thereby controlling the air volume in a more quantitative and targeted manner, improving the effectiveness and efficiency of exhaust, and avoiding energy waste caused by excessive exhaust, thereby saving energy costs.

[0078] Furthermore, the above calculation of the appropriate exhaust frequency of the air outlet includes: E1, extracting the wind speed and wind direction at each monitoring time point from the external environment monitoring information, setting the wind direction interference factor, recorded as .

[0079] E2. Extract the last air outlet time point from the air outlet record log, and use the interval between the last air outlet time point and the current time point as the exhaust maintenance time length.

[0080] E3. Based on the current exhaust frequency, the set exhaust interval duration is counted, and the ratio of the exhaust maintenance duration to the set exhaust interval duration is recorded as the current exhaust maintenance duration ratio.

[0081] For example, the unit of exhaust frequency is hour / time, such as 2 times per hour, then the exhaust interval is 30 minutes, and when comparing and analyzing the cumulative exhaust interval and the set exhaust interval, it is necessary to unify the units, such as converting them both into minutes for analysis, or converting them both into hours for analysis.

[0082] E4. Based on the preset exhaust maintenance time ratios corresponding to the reference indoor temperature difference and the reference indoor carbon dioxide concentration difference, the current exhaust maintenance time ratio corresponding to the reference indoor temperature difference and the reference indoor carbon dioxide concentration difference are obtained, which are recorded as and .

[0083] It should be added that the reference indoor temperature difference and the indoor carbon dioxide concentration difference are positively correlated with the current exhaust maintenance time ratio, that is, the larger the current exhaust maintenance time ratio, the larger the reference indoor temperature difference and the reference indoor carbon dioxide concentration difference. Assuming that the current exhaust maintenance time ratio is 0.5, The value can be 5℃. The value can be 500ppm. Assuming that the current exhaust maintenance time ratio is 0.8, The value can be 8℃. The value can be 1000ppm, etc., where the maintenance time ratios of each exhaust air flow correspond to the reference indoor temperature difference and the reference indoor carbon dioxide concentration difference, which need to be combined with the area type and can be adjusted accordingly according to actual conditions.

[0084] E5. Calculate the current indoor temperature difference and the current indoor carbon dioxide concentration difference of each air outlet, and calculate the average current indoor temperature difference by averaging. The difference between the average current indoor carbon dioxide concentration and .

[0085] E6. Count the deviation of the current internal environment adjustment ,

[0086] .

[0087] E7. Extract the reference exhaust frequency corresponding to the current internal environment adjustment deviation from the database, recorded as ,Will As the appropriate exhaust frequency of the air outlet, To set the reference wind direction interference factor.

[0088] It should be added that The specific value can be 0.3.

[0089] Regarding setting the wind direction interference factor in step E1, the steps include: E11, calculating the average wind speed at each monitoring time point to obtain the average wind speed.

[0090] E12. Traverse the wind direction at each monitoring time point, confirm the concentrated wind direction, import the average wind speed, concentrated wind direction and the position of each air outlet into the fluid mechanics model, and obtain the wind outlet angle and wind speed of each air outlet.

[0091] It can be understood that the air outlet angle refers to the angle between the air outlet direction and the concentrated wind direction.

[0092] E13. Compare the air outlet angle and wind speed of each air outlet with the set interference air outlet angle and the set interference wind speed respectively. If the air outlet angle of an air outlet is greater than the set interference air outlet angle and the wind speed is greater than the set interference wind speed, then the air outlet is recorded as an interference air outlet.

[0093] E14. Count the number of interfering air outlets and compare it with the number of air outlets, and use the ratio as the wind direction interference factor.

[0094] What needs to be added about step E12 is that the concentrated wind direction refers to the mode of wind directions. The wind directions at each monitoring time point are traversed, and the number of monitoring time points at which different wind directions appear is counted. The wind direction with the largest number of monitoring time points represents the concentrated wind direction described in the present invention.

[0095] What needs to be added about step E12 is that the direction and speed distribution of the air outlet of each air outlet can be simulated through the fluid mechanics model, and then the angle between the air outlet direction of each air outlet and the concentrated wind direction and the wind speed at each air outlet position can be obtained. In a specific embodiment, the average wind speed, the concentrated wind direction and the position of each air outlet can also be imported into tools such as computer simulation software to simulate the angle between the air outlet direction of each air outlet and the concentrated wind direction and the wind speed at each air outlet position. Among them, the simulation of wind direction and wind speed is a more common simulation method currently available, and its specific simulation process and simulation principle will not be repeated here.

[0096] Regarding step E13, it should be added that the appropriate angle interval between the air outlet direction and the concentrated wind direction is usually When the angle between the outlet direction and the wind direction is small, the two are basically in the same direction. At this time, the natural wind can assist the outlet to speed up the air flow and improve the outlet efficiency. That is, the specific value of the interference outlet angle can be The interference wind speed is generally set to 3 meters per second. At this wind speed, the natural wind will interact with the wind discharged from the outlet, which may change the direction and speed of the exhaust and affect the exhaust effect.

[0097] Regarding the setting of wind direction interference factor, it should be added that both air outlet and air inlet are affected by the external environment, but the two are affected in slightly different ways. Air outlet refers to the discharge of indoor air to the outside. It is affected by the external environment mainly by affecting the operation effect and energy consumption of ventilation equipment, because exhaust only discharges indoor air to the outside and does not introduce new air. Therefore, the exhaust frequency will not be affected by external temperature, humidity and air quality. However, considering the energy consumption of the ventilation system, the wind direction is also critical to the setting of the air outlet. When the wind direction is consistent with the direction of the air outlet, the operating resistance of the ventilation system can be reduced and energy consumption can be reduced. In addition, inappropriate wind direction may also cause the ventilation system to start and stop frequently, shortening the service life of the equipment. Therefore, when the wind direction and wind speed are relatively stable and meet the operation requirements, the exhaust frequency can be appropriately increased. Otherwise, the exhaust frequency is set according to the indoor exhaust requirements. The wind speed and wind direction parameters are used to set the wind direction interference factor.

[0098] When calculating the appropriate exhaust frequency of the air outlet, the embodiment of the present invention sets the wind direction interference factor by considering the influence of the external wind speed and wind direction on the exhaust air, so as to more accurately judge the expected exhaust situation of the air outlet, thereby ensuring the rationality and adaptability of the exhaust frequency setting.

[0099] Furthermore, the above calculation of the comprehensive setting consistency of the air outlets includes: F1, recording each air outlet whose current indoor temperature difference is greater than the set reference first indoor temperature difference or whose current indoor carbon dioxide concentration difference is greater than the set reference first indoor carbon dioxide concentration difference as each open air outlet.

[0100] F2. If the opening state of a certain open air outlet is open, record the air outlet as a state-matching air outlet, count the number of state-matching air outlets, and compare it with the number of air outlets to obtain a state-matching air outlet ratio.

[0101] F3. Calculate the appropriate air volume of each air outlet in the same way as the calculation method of the appropriate air volume of the air outlet.

[0102] F4. Calculate the difference between the current air volume of each air outlet and the appropriate air volume. If the difference is within the set difference range, record the air outlet as the air outlet that matches the air outlet, and compare it with the number of air outlets to obtain the air outlet matching ratio.

[0103] It should be added that the current indoor temperature difference of each air outlet refers to the difference between the monitored temperature of each air outlet area corresponding to the current monitoring time point and the suitable indoor temperature, and the current indoor carbon dioxide concentration difference of each air outlet refers to the difference between the monitored carbon dioxide concentration of each air outlet area corresponding to the current monitoring time point and the suitable indoor carbon dioxide concentration.

[0104] F5. Filter out the minimum value from the state matching air ratio and the air outlet matching air ratio as the comprehensive setting matching degree of the air outlet.

[0105] Exemplarily, the reference calculation formula for the appropriate air volume of each air outlet is:

[0106] , Indicates The current indoor temperature difference of each air outlet is and Respectively represent The temperature change rate and temperature difference of the outlet area, Indicates the air outlet number. .

[0107] The database is used to store suitable indoor temperatures and suitable indoor carbon dioxide concentrations, and to store reference exhaust frequencies corresponding to various internal environment adjustment deviations.

[0108] The air outlet control confirmation module is used to confirm the control air outlet and the control air outlet settings of each control air outlet, and perform corresponding air outlet.

[0109] Specifically, confirming the regulated air outlets includes: when the current air outlet mode is overall air outlet, recording the air outlets whose opening state is closed and the air outlets whose air volume difference or exhaust frequency difference is not within the corresponding set difference range as regulated air outlets.

[0110] When the current air outlet mode is local air outlet, the state deviation air outlet and the air outlet deviation air outlet are used as the control air outlet.

[0111] In yet another specific embodiment, confirming the regulated air outlet settings of each regulated air outlet includes: calculating a suitable air volume and a suitable exhaust frequency of each regulated air outlet.

[0112] The opening state is set to on, the appropriate air volume and the appropriate exhaust frequency are used as the regulated air outlet settings for each regulated air outlet.

[0113] It should be added that the calculation method of the suitable air volume and suitable exhaust frequency of each regulated air outlet is the same as that of the suitable air volume and suitable exhaust frequency of a single air outlet. The only difference is that the mean calculation of the relevant parameters of each regulated air outlet is not performed, such as the mean calculation of the current indoor temperature difference and the current indoor carbon dioxide concentration difference of each air outlet. The specific calculation formula is not specifically calculated.

[0114] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A fresh air intelligent control system based on multi-air outlet coordination, characterized in that: include: The air outlet information integration module is used to import the spatial volume of the target area, the number of air outlets arranged, the current air outlet settings of each air outlet, the placement location information and the air outlet record log, and summarize the air outlet setting information set; The environmental information monitoring module is used to monitor the internal environment in each air outlet area, integrate the internal environment monitoring information, and monitor the external environment at the same time to obtain the external environment monitoring information; The air outlet mode confirmation module is used to confirm the current air outlet mode, which includes the overall mode and the local mode; The air outlet control judgment module is used to judge whether to perform air outlet control based on the air outlet mode. If the judgment result is yes, the air outlet setting control module is started. If the judgment result is no, the corresponding air outlet is performed according to the current air outlet setting. A database for storing suitable indoor temperatures and suitable indoor carbon dioxide concentrations, and storing reference exhaust frequencies corresponding to the deviations of various internal environment adjustment degrees; The air outlet control confirmation module is used to confirm the control outlets and the control outlet settings of each control outlet, and to perform corresponding air outlets; The confirming of the current air outlet mode includes: The monitoring temperature of each outlet area corresponding to the current monitoring time point is extracted from the internal environment monitoring information, and the highest monitoring temperature is screened out. At the same time, the average value of the corresponding monitoring temperature of each outlet area is calculated. The highest monitoring temperature and the average value of the monitoring temperature are averaged, and the calculation result is used as the target internal temperature, which is recorded as ; Extract the monitored carbon dioxide concentration of each outlet area corresponding to the current monitoring time point from the internal environment monitoring information, and The confirmation method is similar to confirming the target internal carbon dioxide concentration, recorded as ; Extract the suitable indoor temperature and suitable indoor carbon dioxide concentration from the database and record them as and ; Define the reference first indoor temperature difference and the reference first indoor carbon dioxide concentration difference, which are denoted as and , set the trigger conditions for overall air output, and determine whether any of the trigger conditions are met; If it exists, select the overall mode as the current air outlet mode, otherwise select the local mode as the current air outlet mode; The trigger conditions for setting the overall air outlet include: Extracting the installation height from the installation position information, comparing the installation heights of the air outlets, removing duplicates of the same installation height, and using the remaining air outlets after removing duplicates as reference air outlets; Calculate the standard deviation of the monitored temperature in each reference outlet area as the unevenness of the vertical temperature distribution At the same time, the standard deviation of the monitored temperature and the monitored carbon dioxide concentration corresponding to each outlet area is calculated and recorded as the overall temperature distribution unevenness and the uneven distribution of carbon dioxide concentration ; Will and or and As trigger condition 1, and They are respectively the vertical plane temperature distribution non-uniformity and the temperature distribution non-uniformity of the set reference; Will and As trigger condition 2, In order to set the uneven distribution of reference carbon dioxide concentration, trigger conditions 1 and trigger conditions 2 are used as the trigger conditions of the overall mode; The determining whether to perform air flow control includes: Extract the current air outlet mode; If it is the overall mode, extract the opening status from the current air outlet setting to determine whether the opening status of each air outlet is open. If not, it will be used as the judgment result of air outlet control. If so, calculate the appropriate air volume of the air outlet and the appropriate exhaust frequency of the air outlet; Extract the current air volume and the current exhaust frequency from the current air outlet setting; The difference between the current air volume and the appropriate air volume is recorded as the air volume difference, and the difference between the current exhaust frequency and the appropriate exhaust frequency is recorded as the exhaust frequency difference; Determine whether the air volume difference or exhaust frequency difference of each air outlet is within the corresponding set difference range. If so, whether it is used as the judgment result of air outlet control. Otherwise, it will be used as the judgment result of air outlet control. If it is a local mode, determine whether the opening status of each air outlet is consistent. If so, it will be used as the judgment result of air outlet control. Otherwise, calculate the consistency of the comprehensive setting of the air outlet; When the comprehensive setting consistency of the air outlet is greater than the set reference setting consistency, whether it is used as the judgment result of air outlet control, otherwise, it will be used as the judgment result of air outlet control; The calculating of the appropriate air volume of the air outlet comprises: Extract the indoor temperature difference, recorded as , and the spatial volume of the target area is recorded as ; The monitored temperature of each air outlet area corresponding to each monitoring time point is extracted from the internal environment monitoring information, and the temperature change curve corresponding to each air outlet area is constructed with time as the horizontal axis and the monitored temperature as the vertical axis, and the slope is extracted from it as the temperature change rate; Calculate the standard deviation of the monitored temperature at each monitoring time point in the same air outlet area, and use the calculation result as the temperature difference; The temperature change rate and temperature difference of each outlet area are averaged and the calculation results are recorded as and ; Calculate the reference air volume at the temperature difference level , , To set the reference indoor temperature difference, is a natural constant, is the reference temperature change rate, is the number of air outlets; according to The calculation method is similar to that of the reference air volume at the carbon dioxide concentration difference level, which is recorded as ,from and The maximum value is selected as the appropriate air volume of the air outlet; The calculation of the appropriate exhaust frequency of the air outlet includes: Extract the wind speed and wind direction at each monitoring time point from the external environment monitoring information and set the wind direction interference factor ; Extract the last air discharge time point from the air discharge record log, and use the interval between the last air discharge time point and the current time point as the exhaust maintenance time length; Based on the current exhaust frequency, the set exhaust interval duration is counted, and the ratio of the exhaust maintenance duration to the set exhaust interval duration is recorded as the current exhaust maintenance duration ratio; Based on the preset exhaust maintenance time ratios corresponding to the reference indoor temperature difference and the reference indoor carbon dioxide concentration difference, the current exhaust maintenance time ratio corresponding to the reference indoor temperature difference and the reference indoor carbon dioxide concentration difference are obtained, which are recorded as and ; Calculate the current indoor temperature difference and the current indoor carbon dioxide concentration difference of each air outlet, and calculate the average current indoor temperature difference by averaging The difference between the average current indoor carbon dioxide concentration and ; Statistics of the current internal environment adjustment deviation , ; The reference exhaust frequency corresponding to the current internal environment adjustment deviation is extracted from the database and recorded as ,Will As the appropriate exhaust frequency of the air outlet, To set the reference wind direction interference factor; The setting of the wind direction interference factor includes: Calculate the average wind speed at each monitoring time point to obtain the average wind speed; Traverse the wind direction at each monitoring time point, confirm the concentrated wind direction, import the average wind speed, concentrated wind direction and the position of each air outlet into the fluid mechanics model, and obtain the wind outlet angle and wind speed of each air outlet; The air outlet angle and wind speed of each air outlet are compared with the set interference air outlet angle and the set interference wind speed respectively. If the air outlet angle of an air outlet is greater than the set interference air outlet angle and the wind speed is greater than the set interference wind speed, the air outlet is recorded as an interference air outlet; Count the number of interfering air outlets and compare it with the number of air outlets, and use the ratio as the wind direction interference factor; The calculation of the degree of consistency of the comprehensive setting of the air outlet includes: Each air outlet whose current indoor temperature difference is greater than the set reference first indoor temperature difference or whose current indoor carbon dioxide concentration difference is greater than the set reference first indoor carbon dioxide concentration difference is recorded as an open air outlet; If the opening state of a certain open air outlet is open, the air outlet is recorded as a state-matching air outlet, the number of state-matching air outlets is counted, and compared with the number of air outlets to obtain a state-matching air outlet ratio; Calculate the appropriate air volume of each air outlet in the same way as the calculation method of the appropriate air volume of the air outlet; Calculate the difference between the current air volume of each air outlet and the appropriate air volume. If the difference is within the set difference range, record the air outlet as the air outlet that matches the air outlet, and compare it with the number of air outlets to obtain the air outlet matching ratio. The minimum value is selected from the state matching air-out ratio and the air-out matching air-out ratio as the matching degree of the comprehensive setting of the air outlet; The confirming and regulating the air outlet comprises: When the current air outlet mode is overall air outlet, the air outlets whose opening state is closed and the air outlets whose air volume difference or exhaust frequency difference is not within the corresponding set difference range are recorded as regulated air outlets; When the current air outlet mode is local air outlet, the state deviation air outlet and the air outlet deviation air outlet are used as the control air outlet.

2. The fresh air intelligent control system based on multi-air outlet coordination according to claim 1, characterized in that: The step of confirming the air outlet settings of each air outlet includes: Calculate the appropriate air volume and exhaust frequency of each controlled air outlet; The opening state is set to on, the appropriate air volume and the appropriate exhaust frequency are used as the regulated air outlet settings for each regulated air outlet.

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