Indoor PM2.5 control system and method

Abstract

The present application belongs to the technical field of PM2.5 control, and provides an indoor PM2.5 control system and method. The system can accurately reflect the PM2.5 concentration value of the area by setting multiple PM2.5 sensors in the specific area to increase the detection points. The PM2.5 concentration in the fresh air is detected, and the actual fresh air volume is calculated according to the difference between the indoor measured value and the set value and the fresh air measured value. Then, the variable air volume valve opening is adjusted according to the actual fresh air volume to change the fresh air volume entering the room, so that the PM2.5 content in the specific area is controlled to reach the set value. The method first sets the condition, then monitors the PM value of the specific area in the room, and judges whether the set condition is met. If the set condition is not exceeded, the air volume is not changed and the indoor PM value is continuously detected. If the set condition is exceeded, the control module calculates the actual fresh air volume according to the difference between the set value and the measured value and the fresh air measured value, and then sends a signal to the valve to adjust the fresh air volume until the air quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of PM2.5 control technology, specifically relating to an indoor PM2.5 control system and method. Background Technology

[0002] Air is one of the necessities for human survival, and its quality greatly affects people's health and quality of life. The concentration of particulate matter in indoor air is a crucial standard for assessing air quality, especially PM10 and PM2.5, which have become important factors in evaluating air quality. PM2.5 refers to particulate matter with a diameter of 2.5 micrometers or less; a higher concentration indicates more severe air pollution. PM2.5 particles are small, have a large surface area, are highly reactive, easily carry toxic and harmful substances, and have a long residence time and long transport distance in the atmosphere, significantly impacting human health and indoor environmental quality. Therefore, how to quickly, efficiently, and accurately reduce indoor PM2.5 concentrations has received widespread attention.

[0003] Traditionally, introducing fresh air is used to reduce PM2.5 concentration, and increasing the fresh air volume is a common method. However, the difference between the particle concentration in the fresh air and the indoor particle concentration, along with the amount of fresh air, directly affects the pattern of indoor particle concentration changes. If the fresh air particle concentration is higher than the indoor particle concentration, increasing the fresh air volume will lead to an increase in the indoor particle concentration. If the fresh air particle concentration is lower than the indoor particle concentration, increasing the fresh air volume will lead to a decrease in the indoor particle concentration. Similarly, if the fresh air particle concentration is much lower than the indoor particle concentration, the indoor particle concentration decreases rapidly; if the supply air particle concentration is slightly lower than the indoor particle concentration, the indoor particle concentration decreases slowly. Therefore, the fresh air volume multiplied by the difference between the fresh air particle concentration and the indoor particle concentration is the most important factor directly affecting indoor particle concentration. However, traditionally, the PM2.5 content in the introduced fresh air has been ignored, and the required clean air volume calculated by the control module is considered as the introduced fresh air volume. This results in the PM2.5 content in the room not being accurately controlled within the set value.

[0004] Furthermore, traditionally, indoor PM2.5 concentration monitoring typically involves only one detection point within the room. This may not accurately reflect the overall PM2.5 content because PM2.5 distribution is uneven throughout the room. To more accurately reflect indoor PM2.5 levels, detectors are placed evenly at multiple locations within the room to obtain more data points and improve accuracy. However, this also has drawbacks. For certain specific areas, more attention needs to be paid to the PM2.5 concentration, such as areas where people spend a lot of time. Not all areas need to be monitored. Data obtained from evenly placing detectors at multiple locations may not be suitable for areas where people spend a lot of time, potentially resulting in PM2.5 levels outside the safe range for those areas. Summary of the Invention

[0005] This invention addresses the aforementioned problems by providing an indoor PM2.5 control system and method. Multiple PM2.5 sensors are installed in a specific area to ensure coverage of the entire area and accurate reflection of PM2.5 concentration. Before introducing fresh air, the PM2.5 concentration in the fresh air is detected. The control module calculates the actual fresh air volume based on the difference between the measured indoor value and the set value, along with the measured fresh air volume. The opening of the fresh air valve is then adjusted according to the actual fresh air volume, thereby precisely controlling the PM2.5 content in the specific area to reach a safe set value.

[0006] This invention provides an indoor PM2.5 control system for regulating the PM2.5 value in a specific indoor area. It comprises: a fresh air PM2.5 detection module for detecting the PM2.5 concentration in fresh air to obtain a measured fresh air value; an indoor PM2.5 detection module including multiple PM2.5 sensors installed in the specific indoor area, each sensor detecting a corresponding indoor PM2.5 value; and a control module communicatively connected to both the fresh air PM2.5 detection module and the indoor PM2.5 detection module. The control module includes: a setting unit for inputting a setpoint; a receiving and storage unit for receiving and storing the measured fresh air value and multiple indoor PM2.5 values; an average value calculation unit for calculating the average of the multiple indoor PM2.5 values ​​to obtain the measured indoor value; a judgment unit for determining the magnitude of the measured indoor value, the measured fresh air value, and the setpoint; a calculation unit for calculating the actual fresh air volume based on the difference between the measured indoor value and the setpoint, and the measured fresh air value; and an instruction unit for sending a valve opening signal to a variable air volume valve based on the actual fresh air volume.

[0007] The indoor PM2.5 control system provided by this invention may also have the following feature: a specific indoor area is an area where people stay for a long time, and the indoor PM2.5 detection module includes multiple PM2.5 sensors evenly distributed in the area where people stay for a long time.

[0008] The indoor PM2.5 control system provided by the present invention may also have the following feature: wherein the fresh air PM2.5 detection module is a PM2.5 sensor installed on the inlet pipe of the fresh air valve.

[0009] The indoor PM2.5 control system provided by the present invention may also have the following feature: the setting unit is an input panel installed indoors.

[0010] This invention also provides an indoor PM2.5 control method for regulating the PM2.5 value in a specific indoor area, characterized by the following steps:

[0011] Step S1: Input the set value in the control module, then proceed to step S2;

[0012] Step S2: The control module determines whether the measured value of indoor air is greater than the measured value of fresh air. If yes, proceed to step S2; otherwise, end.

[0013] Step S3: The control module determines whether the measured value indoors is greater than the set value. If yes, proceed to step S4; otherwise, end.

[0014] Step S4: The control module determines whether the set value is greater than the measured value of fresh air. If yes, proceed to step S5; otherwise, the variable air volume valve operates at its maximum operating condition.

[0015] In step S5, the control module calculates the actual fresh air volume based on the difference between the measured indoor value and the set value, and the measured fresh air volume, and then sends a valve opening signal to the variable air volume valve.

[0016] The indoor PM2.5 control method provided by this invention may also have the following feature: the actual fresh air volume is calculated by the following three formulas:

[0017] e(t) = C SP -C PV (1),

[0018]

[0019]

[0020] In the formula, Q sa (t) represents the clean fresh air volume; K P T is the proportionality coefficient; I T is the integration time; D is the differential coefficient; t is the program running time; C SP For indoor settings; C PV This is the measured value indoors; Q outputC represents the actual fresh air volume. indoor This is the measured value indoors; C sa These are the actual measured values ​​for fresh air intake.

[0021] The indoor PM2.5 control method provided by the present invention may also have the following feature: wherein the control module receives the measured value of fresh air transmitted by the fresh air PM2.5 detection module and multiple indoor PM2.5 values ​​transmitted by the indoor PM2.5 detection module set in a specific area of ​​the room, and then calculates the average value of the multiple indoor PM2.5 values ​​to obtain the measured value of the room.

[0022] The role and effect of invention

[0023] This invention provides an indoor PM2.5 control system and method for regulating the PM2.5 value in a specific indoor area. By setting multiple PM2.5 sensors within the specific area to increase detection points and ensure coverage of the entire area, the average value accurately reflects the PM2.5 concentration in that area. Before introducing fresh air, the PM2.5 concentration in the fresh air is detected. The actual fresh air volume required to pass through the variable air volume (VAV) valve is calculated using the difference between the room's PM2.5 concentration and the set value, along with the PM2.5 concentration in the fresh air. The command unit then adjusts the opening of the VAV valve based on this actual fresh air volume signal, thereby controlling the PM2.5 content in the specific area of ​​the room to reach a safe set value.

[0024] The control method provided by this invention is a method for adjusting the fresh air volume based on whether the PM value in a specific area exceeds the standard. First, the control settings are determined. Then, the PM value in a specific area of ​​the room is monitored, and it is determined whether the settings are met. If the settings are not exceeded, the air volume is not changed, and the indoor PM value is monitored again. If the settings are exceeded, the control module calculates the required clean air volume based on the difference between the set value and the measured value. Then, the actual fresh air volume is calculated based on the relationship between the clean air volume and the actual fresh air volume. Finally, a signal is sent to the valve to adjust the fresh air volume until the air quality is improved. If the PM2.5 concentration in the fresh air is greater than the set value, the system operates at maximum capacity to ensure that the indoor PM2.5 concentration is reduced as quickly as possible.

[0025] In order to keep indoor PM2.5 values ​​within a safe range (set value), this system and method installs multiple sensors indoors and takes into account the impact of PM2.5 in fresh air, thereby accurately controlling indoor PM2.5. This achieves the goal of precisely adjusting the PM2.5 value in specific indoor areas, thereby improving air quality. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the indoor PM2.5 control system in an embodiment of the present invention;

[0027] Figure 2 This is a structural block diagram of the control module in an embodiment of the present invention; and

[0028] Figure 3 This is a flowchart illustrating the indoor PM2.5 control method in an embodiment of the present invention.

[0029] Figure 4 This is a schematic flowchart of an indoor PM2.5 control method according to a variation of the present invention. Reference numerals: Control system 100, Fresh air PM2.5 detection module 10, Indoor PM2.5 detection module 20, Control module 30, Setting unit 301, Receiving and storage unit 302, Average value calculation unit 303, Judgment unit 304, Calculation unit 305, Instruction unit 306, Control unit 307. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the indoor PM2.5 control system and method of the present invention will be specifically described below in conjunction with embodiments and accompanying drawings.

[0031] <Example>

[0032] Figure 1 This is a schematic diagram of the structure of the indoor PM2.5 control system in an embodiment of the present invention.

[0033] like Figure 1 As shown, the indoor PM2.5 control system 100 is used to regulate the PM2.5 value of a specific area indoors, including a fresh air PM2.5 detection module 10, an indoor PM2.5 detection module 20, and a control module 30.

[0034] The fresh air PM2.5 detection module 10 is a PM2.5 sensor installed on the inlet pipe of the fresh air valve to detect the PM2.5 concentration of the fresh air in the pipe and obtain the measured value of the fresh air.

[0035] The indoor PM2.5 detection module 20 includes multiple PM2.5 sensors installed in a specific area of ​​the room. Each PM2.5 sensor detects the PM2.5 concentration in its area to obtain a corresponding indoor PM2.5 value. In this embodiment, the specific area is a place where people spend a lot of time. The multiple PM2.5 sensors are evenly distributed in this area to ensure that they cover the area. The spacing between the PM2.5 sensors is reasonable, which can accurately reflect the PM2.5 concentration value of the area.

[0036] The control module 30 is connected to the PM2.5 sensor on the outdoor inlet pipe and the PM2.5 sensors in each room via a wireless network 40.

[0037] Figure 2 This is a structural block diagram of the control module in an embodiment of the present invention.

[0038] like Figure 2 As shown, the control module 30 includes a setting unit 301, a receiving and storage unit 302, an average value calculation unit 303, a judgment unit 304, a calculation unit 305, an instruction unit 306, and a control unit 307, all of which are interconnected. The control unit 307 is used to control the operation of the other units.

[0039] The setting unit 301 is an input panel installed indoors, allowing manual input of a value (set value) to regulate the PM2.5 concentration in a specific area. The receiving and storage unit 302 receives and stores the measured fresh air value signal from the PM2.5 sensor on the inlet duct and the indoor PM2.5 value signal from each sensor in real time. The averaging unit 303 calculates the average of multiple indoor PM2.5 values ​​to obtain the measured indoor value.

[0040] The judgment unit 304 determines the magnitudes of the indoor measured value, the fresh air measured value, and the set value. The calculation unit 305 is a PID controller with a proportional coefficient K. P The actual fresh air volume is calculated based on the difference between the measured indoor air volume and the set value, as well as the measured fresh air volume. The command unit 306 receives the actual fresh air volume signal and sends a valve opening signal to the variable air volume valve based on the actual fresh air volume. The variable air volume valve is wirelessly connected to the command unit 306. After receiving the valve opening signal, it controls the valve opening according to the opening degree to adjust the air volume of fresh air supplied to the room.

[0041] The actual fresh air volume is calculated by the following three formulas using the Calculation Department 305:

[0042] e(t) = C SP -C PV (1),

[0043]

[0044]

[0045] In equations (1), (2) and (3) above, Q sa (t) represents the clean fresh air volume; K P T is the proportionality coefficient; I T is the integration time; D is the differential coefficient; t is the program running time; C SP For indoor settings; C PV This is the measured value indoors; Q output C represents the actual fresh air volume. indoor This is the measured value indoors; C sa These are the actual measured values ​​for fresh air intake.

[0046] From the above three formulas, it can be seen that formula (1) calculates the difference between the collected indoor PM2.5 concentration and the set value; formula (2) calculates the required clean air output based on the data in formula (1); and formula (3) converts the measured PM2.5 concentration in the fresh air (the measured value of the fresh air), the measured value indoors, and the clean air volume to obtain the actual fresh air volume, which is the required actual air supply volume.

[0047] Figure 3 This is a flowchart illustrating the indoor PM2.5 control method in an embodiment of the present invention.

[0048] like Figure 3 As shown, the operation flow of the indoor PM2.5 control system is as follows:

[0049] Step S1: Input the set value in the control module, then proceed to step S2.

[0050] In step S2, the control module determines whether the measured indoor PM value is greater than the measured fresh air value. If yes, proceed to step S3; otherwise, end the process. Here, "end" means not changing the airflow of the variable air volume valve and continuing to monitor the indoor PM value and the fresh air PM concentration, and the same applies below.

[0051] Step S3: The control module determines whether the measured value indoors is greater than the set value. If yes, proceed to step S4; otherwise, end the process.

[0052] Step S4: The control module determines whether the setpoint is greater than the measured fresh air value. If yes, proceed to step S5; otherwise, the variable air volume valve operates at maximum capacity. When "yes," the indoor measured value > setpoint > measured fresh air value, and the setpoint is used as the target standard for indoor PM2.5 concentration. When "no," the indoor measured value > measured fresh air value > setpoint, and the setpoint is meaningless. Therefore, the measured fresh air value is used as the target standard for indoor PM2.5 concentration, and the system operates at maximum capacity to ensure that the indoor PM2.5 concentration decreases as quickly as possible.

[0053] In step S5, the control module calculates the actual fresh air volume based on the difference between the measured indoor value and the set value, and the measured fresh air volume, and then sends a valve opening signal to the variable air volume valve.

[0054] The role and effect of the embodiments

[0055] The indoor PM2.5 control system and method provided in this embodiment are used to regulate the PM2.5 value in a specific area of ​​an indoor space. By setting multiple PM2.5 sensors within the specific area to increase detection points, the entire area is covered. The average value is then calculated to accurately reflect the PM2.5 concentration in that area. Before introducing fresh air, the PM2.5 concentration in the fresh air is detected. The actual fresh air volume required to pass through the variable air volume (VAV) valve is calculated using the difference between the room's PM2.5 concentration and the set value, along with the PM2.5 concentration in the fresh air. The command unit then adjusts the opening of the VAV valve based on this actual fresh air volume signal, thereby controlling the PM2.5 content in the specific area of ​​the room to reach a safe set value.

[0056] The control method provided in this embodiment is a method for adjusting the fresh air volume based on whether the PM value in a specific area exceeds the standard. First, the control settings are determined. Then, the PM value in a specific area of ​​the room is monitored, and it is determined whether the settings are met. If the settings are not exceeded, the air volume is not changed, and the indoor PM value is monitored again. If the settings are exceeded, the control module calculates the required clean air volume based on the difference between the set value and the measured value. Then, the actual fresh air volume is calculated based on the relationship between the clean air volume and the actual fresh air volume. Finally, a signal is sent to the valve to adjust the fresh air volume until the air quality is improved. If the PM2.5 concentration in the fresh air is greater than the set value, the system operates at maximum capacity to ensure that the indoor PM2.5 concentration is reduced as quickly as possible.

[0057] In order to keep indoor PM2.5 values ​​within a safe range (set value), this system and method installs multiple sensors indoors and takes into account the impact of PM2.5 in fresh air, thereby accurately controlling indoor PM2.5. This achieves the goal of precisely adjusting the PM2.5 value in specific indoor areas, thereby improving air quality.

[0058] In this embodiment, the input panel installed indoors serves as the setting unit, allowing personnel to easily set the room PM setting value according to their needs.

[0059] In this embodiment, the fresh air is not considered to be completely clean and pollution-free, but the PM2.5 concentration of the fresh air is taken into account. The actual fresh air volume is calculated using three formulas. The fresh air volume obtained in this way is the amount of air that can produce a purification effect. The actual fresh air volume signal is transmitted to the command unit, and then the command unit sends an opening signal to the variable air volume valve to change the valve core opening and adjust the air volume, so that the PM2.5 in the room can be controlled faster and more accurately.

[0060] <Variation Example>

[0061] This variation describes another process for indoor PM2.5 control, with identical steps assigned the same numbers. Apart from this process, the rest is the same as the embodiment and will not be repeated.

[0062] Figure 4 This is a schematic flowchart of an indoor PM2.5 control method according to a variation of the present invention.

[0063] like Figure 4 As shown, the operation flow of the indoor PM2.5 control system is as follows:

[0064] Step S1: Input the set value in the control module, then proceed to step S2'.

[0065] In step S2', the control module determines whether the measured value indoors is greater than the set value. If yes, proceed to step S3'; otherwise, end the process.

[0066] In step S3', the control module determines whether the measured indoor PM value is greater than the measured fresh air value. If yes, proceed to step S4; otherwise, end. Here, "end" means not changing the airflow of the variable air volume valve and continuing to monitor the indoor PM value and the fresh air PM concentration, the same applies below.

[0067] Step S4: The control module determines whether the setpoint is greater than the measured fresh air value. If yes, proceed to step S5; otherwise, the variable air volume valve operates at maximum capacity. When "yes," the indoor measured value > setpoint > measured fresh air value, and the setpoint is used as the target standard for indoor PM2.5 concentration. When "no," the indoor measured value > measured fresh air value > setpoint, and the setpoint is meaningless. Therefore, the measured fresh air value is used as the target standard for indoor PM2.5 concentration, and the system operates at maximum capacity to ensure that the indoor PM2.5 concentration decreases as quickly as possible.

[0068] In step S5, the control module calculates the actual fresh air volume based on the difference between the measured indoor value and the set value, and the measured fresh air volume, and then sends a valve opening signal to the variable air volume valve.

[0069] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. An indoor PM2.5 control system for regulating the PM2.5 value in a specific indoor area, characterized in that, include: The fresh air PM2.5 detection module is used to detect the PM2.5 concentration in fresh air and obtain the measured value of fresh air. An indoor PM2.5 detection module includes multiple PM2.5 sensors installed in a specific area indoors, with each PM2.5 sensor detecting the PM2.5 concentration to obtain a corresponding indoor PM2.5 value; The control module is communicatively connected to both the fresh air PM2.5 detection module and the indoor PM2.5 detection module. The control module includes: The setting section is used to input setting values; The receiving and storage unit receives and stores the measured values ​​of the fresh air and multiple indoor PM2.5 values; The average value calculation unit calculates the average of multiple indoor PM2.5 values ​​to obtain the measured indoor value; The judgment unit determines the magnitudes of the measured indoor value, the measured fresh air value, and the set value. The calculation unit calculates the actual fresh air volume based on the difference between the measured indoor value and the set value, and the measured fresh air value. The command unit sends valve opening signals to the variable air volume valve based on the actual fresh air volume; Specifically, the indoor area is a place where people stay for extended periods. The indoor PM2.5 detection module includes multiple PM2.5 sensors evenly distributed in areas where people spend a long time; The operation process of the indoor PM2.5 control system includes the following steps: Step S1: Input the set value in the control module, then proceed to step S2; Step S2: The control module determines whether the measured value of indoor air is greater than the measured value of fresh air. If yes, proceed to step S3; otherwise, end. Step S3: The control module determines whether the measured value indoors is greater than the set value. If yes, proceed to step S4; otherwise, end. Step S4: The control module determines whether the set value is greater than the measured value of fresh air. If yes, proceed to step S5; otherwise, the variable air volume valve operates at its maximum operating condition. Step S5: The control module calculates the actual fresh air volume based on the difference between the measured indoor value and the set value and the measured fresh air value, and then sends a valve opening signal to the variable air volume valve. The actual fresh air volume is calculated using the following three formulas: ， ， ， In the above equations (1), (2) and (3), For clean fresh air volume; This is the proportionality coefficient; The integration time; t represents the differential coefficients; t represents the program execution time. Set the indoor setting; These are indoor measured values; This refers to the actual fresh air volume. These are indoor measured values; This is the actual measured value of fresh air intake; The control module receives the measured value of fresh air from the fresh air PM2.5 detection module and multiple indoor PM2.5 values ​​from the indoor PM2.5 detection module set in a specific area of ​​the room. Then, it calculates the average of the multiple indoor PM2.5 values ​​to obtain the measured value of the room.

2. The indoor PM2.5 control system according to claim 1, characterized in that: in, The fresh air PM2.5 detection module is a PM2.5 sensor installed on the inlet pipe of the fresh air valve.

3. The indoor PM2.5 control system according to claim 1, characterized in that: in, The setting unit is an input panel installed indoors.

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