Laboratory air conditioning method and control system thereof

Abstract

The invention discloses a laboratory air conditioning method and a control system thereof, and belongs to the field of air conditioning. The harmful gas concentration in the laboratory is estimated through the gas detectors and the wind speed sensors, the estimated value is compared with the target safety value, and when it is judged that the harmful gas concentration estimated value is larger than the target safety value, the ventilation equipment is adjusted and controlled with the harmful gas concentration estimated value as a key regulation and control index. Therefore, harmful gas in the laboratory can be exhausted in time, and the situation that the personal safety of experimenters is threatened due to the fact that the local concentration is too high is avoided. Besides, when the ventilation equipment is regulated and controlled, the ventilation quantity and the ventilation speed of the ventilation equipment can be regulated and controlled by taking a harmful gas concentration estimated value as a key regulation and control factor, and meanwhile, the ventilation quantity and the ventilation speed of the ventilation equipment can be regulated and controlled by taking a combination of a gas generation source position coordinate and a tuyere position coordinate of the ventilation equipment as the key regulation and control factor. And the air port angle of the ventilation equipment is regulated and controlled.

Description

Technical Field

[0001] The present invention relates to air conditioning, and in particular to a laboratory air conditioning method and a control system thereof. Background Art

[0002] During chemical and physical experiments in the laboratory, harmful substances are often produced, polluting the air within the laboratory. Therefore, ensuring the safety of laboratory personnel through proper air conditioning is crucial. Current laboratory air conditioning systems install harmful gas concentration sensors within the laboratory. These sensors detect excessive levels of harmful gases within the laboratory and activate the ventilation system to achieve air conditioning within the laboratory. However, due to the large size of the laboratory, existing alarm ventilation procedures require waiting for the harmful gases to diffuse to the sensors and accumulate to a certain concentration before triggering the alarm ventilation procedure. This can easily lead to concentrations exceeding the standard in the area near the source of the harmful gas, but the alarm ventilation procedure cannot be activated in a timely manner, posing a threat to the safety of laboratory personnel. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a laboratory air conditioning method and control system thereof to solve the problem that the current laboratory air conditioning system is unable to start the alarm ventilation program in time after harmful gas pollution occurs in the laboratory, thereby easily posing a threat to the personal safety of laboratory personnel.

[0004] Technical solution: A laboratory air conditioning method, comprising the following steps:

[0005] S1. Deploy multiple integrated gas detectors and wind speed sensors in the laboratory to monitor and collect data on the concentration of harmful gases and wind speed in the laboratory in real time.

[0006] S2. Record and store the information data collected in step S1, and at the same time integrate the air flow rate information collected by multiple wind speed sensors to obtain the average air flow rate in the laboratory, and record and store the average air flow rate in the laboratory;

[0007] S3. After the integrated gas detector senses the harmful gas, it starts to perform comprehensive estimation processing on the recorded and stored information, so as to make a real-time estimation of the concentration of the harmful gas in the laboratory, and then obtain the concentration estimation value of the harmful gas leakage source, and compare the concentration estimation value of the harmful gas with the target safety concentration value;

[0008] S4. When it is determined that the estimated concentration of the harmful gas is greater than the target safe concentration, the estimated concentration of the harmful gas obtained in step S3 is used as a first control factor. The exhaust volume of the ventilation device is controlled by the first control factor. The air outlet speed of the ventilation device is then adjusted according to the exhaust volume demand to obtain an air outlet speed control parameter.

[0009] S5. Using the concentration gradient inversion of the harmful gas concentration data monitored by the multiple integrated gas detectors, the location coordinates of the harmful gas source can be obtained. The location coordinates of the known vent location coordinates of the ventilation equipment are used as a second control factor. The vent angle of the ventilation equipment is adjusted and controlled using the second control factor to obtain an vent angle control parameter.

[0010] S6. Use the air outlet speed control parameter obtained in step S4 and the air outlet angle control parameter obtained in step S5 as control instructions to control the ventilation equipment, thereby adjusting the air in the laboratory.

[0011] Preferably, the integrated gas detector integrates a chlorine sensor, a hydrogen sulfide sensor, a carbon monoxide sensor, an ammonia sensor and a formaldehyde sensor; it can respectively monitor and collect the concentrations of chlorine, hydrogen sulfide, carbon monoxide, ammonia and formaldehyde harmful gases in the laboratory in real time.

[0012] Preferably, in the process of estimating the concentration of harmful gases, the real-time concentration of harmful gases monitored by each integrated gas detector is obtained, and the average air flow rate in the room is obtained at the same time, and the obtained information data is comprehensively processed to obtain the concentration estimate C of the harmful gases. calc for:

[0013]

[0014] Among them, C sensor,i is the real-time concentration of harmful gases detected by the i-th integrated gas detector, K position,i is the integrated gas detector position weight, λ is the time decay factor, t i is the data update interval of the integrated gas detector, v is the average indoor air velocity, and A, b, and c are the diffusion attenuation coefficients.

[0015] Preferably, when regulating the exhaust volume of the ventilation equipment, the estimated value of the harmful gas concentration is used as the key regulating factor, and the exhaust volume Q of the ventilation equipment regulated by the regulating factor is req for:

[0016]

[0017] Where K is the ventilation response coefficient, C targetis the target safety concentration, V room is the laboratory volume;

[0018] Then, the exhaust volume is used as the key control factor, and the wind speed control parameter V of the ventilation equipment is obtained by controlling the key control factor. vent for:

[0019]

[0020] Among them, A vent is the cross-sectional area of ​​the tuyere, v safe For safe flow rate.

[0021] Preferably, when locating the position coordinates of the harmful gas source, the harmful gas concentrations monitored by multiple integrated gas sensors are combined with a distributed static sensor array positioning algorithm to obtain the position coordinates of the harmful gas source.

[0022] Preferably, when adjusting and controlling the vent angle of the ventilation equipment, the position coordinates of the harmful gas source combined with the vent position coordinates of the ventilation equipment are used as key control factors, and the vent angle control parameter θ of the ventilation equipment obtained by controlling the key control factors is:

[0023]

[0024] Among them, Xs ource is the location coordinate of the harmful gas source, X vent is the coordinate of the air outlet position, and h is the installation height of the integrated gas detector.

[0025] A control system for laboratory air conditioning, comprising: a detection and acquisition module, a data transmission module, a data storage module, a core processing and analysis module, and an execution control module;

[0026] Detection and acquisition module: includes wind speed sensor and integrated gas detector. The wind speed sensor is used to monitor and collect the air flow rate in the laboratory in real time. The integrated gas detector is used to monitor and collect the concentration of harmful gases in the laboratory in real time.

[0027] Data transmission module: used to transmit the information data collected by the detection and acquisition module to the data storage module, and also used to transmit the control command signal issued by the core processing and analysis module to the execution control module.

[0028] Data storage module: used to receive information data transmitted by the data transmission module and store the received information data.

[0029] Core processing and analysis module: used to process and analyze the information data stored in the data storage module, so as to obtain the estimated concentration of harmful gases in the laboratory, and compare the estimated concentration with the target safety concentration value and the reverse, and judge whether the estimated concentration of harmful gases exceeds the standard. After judging that the estimated concentration of harmful gases exceeds the standard, the estimated concentration of harmful gases is used as the core indicator to process and calculate the wind speed and air outlet angle control parameters of the ventilation equipment, and send the control parameters as control instructions to the execution control module.

[0030] Execution control module: After receiving the control command signal sent by the core processing and analysis module, it is used to control the wind speed and wind angle of the ventilation equipment according to the wind speed and wind angle adjustment parameters in the control command.

[0031] Beneficial effect: The present invention estimates the concentration of harmful gases in the laboratory through multiple integrated gas detectors and wind speed sensors. During the estimation process, when multiple integrated gas detectors begin to detect the concentration of harmful gases, the concentration of harmful gases is estimated in real time in combination with the wind speed in the laboratory, and the estimated value is compared with the target safety value. When it is determined that the estimated value of the harmful gas concentration is greater than the target safety value, the ventilation equipment is adjusted and controlled using the estimated value of the harmful gas concentration as a key control indicator, so that the harmful gases in the laboratory can be discharged in time to avoid the situation where the local concentration is too high, thereby posing a threat to the personal safety of the experimenters. In addition, when regulating the ventilation equipment, the estimated value of the harmful gas concentration can be used as a key control factor to regulate the ventilation volume and ventilation speed of the ventilation equipment. At the same time, the coordinates of the gas source position combined with the coordinates of the air outlet position of the ventilation equipment can be used as key control factors to regulate the air outlet angle of the ventilation equipment, so that the ventilation equipment can quickly discharge the harmful gases in the laboratory and ensure the safety of the laboratory personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the implementation process;

[0033] Figure 2 It is a graph showing the relationship between exhaust volume, estimated harmful gas concentration, and laboratory volume;

[0034] Figure 3 It is a graph showing the relationship between the air outlet velocity, exhaust volume and air outlet cross-sectional area. DETAILED DESCRIPTION

[0035] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example:

[0037] like Figure 1As shown, a laboratory air conditioning method first deploys a detection and acquisition module within the laboratory. The detection and acquisition module includes multiple integrated gas detectors and multiple wind speed sensors deployed within the laboratory. The integrated gas detector integrates gas sensors such as a chlorine sensor, a hydrogen sulfide sensor, a carbon monoxide sensor, an ammonia sensor, and a formaldehyde sensor; it can respectively monitor and collect the concentrations of harmful gases such as chlorine, hydrogen sulfide, carbon monoxide, ammonia, and formaldehyde within the laboratory in real time. Furthermore, the wind speed sensor can monitor and collect the air flow rate within the laboratory in real time. The monitored and collected information data is transmitted to the data storage module via the data transmission module for recording and storage. The core processing and analysis module performs comprehensive processing on the laboratory air flow rate data monitored by the multiple wind speed sensors stored in the data storage module, thereby obtaining the average air flow rate within the laboratory.

[0038] At the same time, the core processing and analysis module comprehensively processes the multiple harmful gas concentration detection values ​​stored in the data storage module and the average air flow rate in the laboratory, so as to estimate the concentration of harmful gases in the laboratory and obtain the estimated concentration value C of the harmful gases. calc for:

[0039]

[0040] Among them, C sensor,i K is the real-time concentration of harmful gases detected by the i-th integrated gas detector. position,i is the integrated gas detector position weight (0.1~1.0), determined by airflow simulation. The closer the integrated gas detector is to the source of the harmful gas, the greater its weight is, and vice versa. λ is the time decay factor, which is related to the properties of the harmful gas (e.g., ammonia λ=0.02, chlorine λ=0.05). i = is the data update interval for the integrated gas detector to avoid high noise from outdated data. v is the average indoor air velocity. A, b, and c are the diffusion attenuation coefficients, calibrated through CFD simulation. A represents the influence of spatial layout (such as equipment obstruction coefficient), b represents the nonlinear effect of flow velocity (typically set to 0.8), and c is the background concentration.

[0041] If a chlorine leak occurs in a laboratory, the position weight of near-source integrated gas detector A is 1.0, the detected chlorine concentration is 15 ppm, the position weight of far-source integrated gas detector B is 0.4, the detected chlorine concentration is 2 ppm, and the average air velocity in the laboratory is 0.3 m / s, A = 0.6, and c = 0.1. The estimated chlorine concentration at this time is:

[0042]

[0043] Then the estimated chlorine concentration value of 8.7ppm is compared with the target safety concentration value of 0.5ppm. At this time, 8.7ppm>0.5ppm, so it is judged that the chlorine concentration in the laboratory exceeds the standard. At this time, the estimated chlorine concentration value is used as the first control factor to control the exhaust volume of the ventilation equipment. The exhaust volume Q of the ventilation equipment is obtained. req for:

[0044]

[0045] Where K is the ventilation response coefficient, ranging from 0.5 to 2.0, determined by the ventilation efficiency (e.g., 1.5 for a VAV system). target is the target safety concentration. room The exhaust volume is constrained by the estimated concentration of harmful gases and the volume of the laboratory. When the estimated concentration of harmful gases exceeds the target safety concentration, the exhaust volume of the ventilation equipment can be regulated. The regulation results are as follows: Figure 2 As shown in the figure, when the estimated concentration of harmful gases exceeds the target safety concentration, the larger the estimated concentration of harmful gases, the larger the regulated exhaust volume. Moreover, since the larger the volume of the laboratory, the greater the impact on the exhaust efficiency, the larger the volume of the laboratory, the larger the regulated exhaust volume. Thus, when a harmful gas leak occurs in the laboratory, the exhaust volume of the ventilation equipment can be regulated to expel the harmful gases in a timely and rapid manner, thereby regulating the air in the laboratory. In addition, the regulated exhaust volume is constrained by the ventilation response coefficient K, which is determined by the ventilation efficiency. When the ventilation efficiency is greater, the ventilation response coefficient is also greater, which can make the regulated exhaust volume larger, further regulating the air in the laboratory in a timely and effective manner. In addition, when the estimated concentration of harmful gases is less than the target safety concentration, the regulated emission volume is 0, indicating that the ventilation equipment continues to operate normally.

[0046] The volume V of the laboratory where the chlorine leak currently occurs room 80m 3 , using the VAV system. At this time, the exhaust volume of the ventilation system is:

[0047]

[0048] Then the total exhaust air volume Q of the exhaust equipment is req As the key control factor, the outlet speed of the ventilation equipment is controlled by the exhaust volume, and the outlet speed control parameter V is obtained. vent for:

[0049]

[0050] Among them, A vent is the cross-sectional area of ​​the tuyere, v safeThe air outlet speed is the key constraint index of the exhaust volume and the cross-sectional area of ​​the air outlet. The control result is as follows: Figure 3 As shown in the figure, when the regulated exhaust volume is larger, the wind speed of the tuyere should also be larger, so as to quickly discharge the harmful gases in the laboratory. At the same time, the cross-sectional area of ​​the tuyere will affect the wind speed of the tuyere. When the cross-sectional area of ​​the tuyere is smaller, the wind speed of the tuyere will be larger. Combined with the regulated exhaust volume, the air in the laboratory can be regulated in a timely and effective manner. At the same time, the wind speed of the tuyere is affected by the safety flow rate v safe Constraints are used to prevent the air outlet from flowing too fast, which could cause an explosion of flammable gases. When the controlled exhaust volume is 0, the controlled air outlet speed is also 0, indicating that the ventilation equipment is operating normally and the air outlet speed does not change.

[0051] The cross-sectional area A of the air outlet of the ventilation system currently used in the laboratory vent =0.1m 2 Safe flow rate v safe =3.0m / s. At this time, the wind speed control parameters of the air outlet are:

[0052]

[0053] At the same time, the concentration of harmful gases monitored by multiple integrated gas sensors is inverted through the distributed static sensor array positioning algorithm to obtain the location coordinates of the harmful gas source. Combined with the known sealing position coordinates of the ventilation equipment as the second control factor, the air outlet angle of the ventilation equipment is adjusted and controlled by the second control factor, and the air outlet angle control parameter θ is obtained as:

[0054]

[0055] Among them, Xs ource is the location coordinate of the harmful gas source, X vent is the coordinate of the air outlet position, and h is the installation height of the integrated gas detector.

[0056] The core processing and analysis module then sends the air outlet speed and air outlet angle control parameters as control instructions to the execution control module. Upon receiving the control instruction signal from the core processing and analysis module, the execution control module controls the air speed and exhaust angle of the ventilation equipment based on the air speed and air outlet angle control parameters in the control instructions. This allows for prompt and rapid air conditioning in the laboratory when a hazardous gas leak occurs, ensuring the safety of laboratory personnel.

[0057] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A laboratory air conditioning method, characterized in that: The following steps are involved: S1. Deploy multiple integrated gas detectors and wind speed sensors in the laboratory to monitor and collect data on the concentration of harmful gases and wind speed in the laboratory in real time. S2. Record and store the information data collected in step S1, and at the same time integrate the air flow rate information collected by multiple wind speed sensors to obtain the average air flow rate in the laboratory, and record and store the average air flow rate in the laboratory; S3. After the integrated gas detector senses the harmful gas, it starts to perform comprehensive estimation processing on the recorded and stored information, so as to make a real-time estimation of the concentration of the harmful gas in the laboratory, and then obtain the concentration estimation value of the harmful gas leakage source, and compare the concentration estimation value of the harmful gas with the target safety concentration value; S4. When it is determined that the estimated concentration of the harmful gas is greater than the target safe concentration, the estimated concentration of the harmful gas obtained in step S3 is used as a first control factor. The exhaust volume of the ventilation device is controlled by the first control factor. The air outlet speed of the ventilation device is then adjusted according to the exhaust volume demand to obtain an air outlet speed control parameter. S5. Using the concentration gradient inversion of the harmful gas concentration data monitored by the multiple integrated gas detectors, the location coordinates of the harmful gas source can be obtained. The location coordinates of the known vent location coordinates of the ventilation equipment are used as a second control factor. The vent angle of the ventilation equipment is adjusted and controlled using the second control factor to obtain an vent angle control parameter. S6. Use the air outlet speed control parameter obtained in step S4 and the air outlet angle control parameter obtained in step S5 as control instructions to control the ventilation equipment, thereby adjusting the air in the laboratory.

2. The laboratory air conditioning method according to claim 1, characterized in that: The integrated gas detector integrates a chlorine sensor, a hydrogen sulfide sensor, a carbon monoxide sensor, an ammonia sensor and a formaldehyde sensor; it can respectively monitor and collect the concentrations of chlorine, hydrogen sulfide, carbon monoxide, ammonia and formaldehyde harmful gases in the laboratory in real time.

3. The laboratory air conditioning method according to claim 1, characterized in that: In the process of estimating the concentration of harmful gases, the real-time concentration of harmful gases monitored by each integrated gas detector is obtained, and the average air flow rate in the room is obtained at the same time. The obtained information data is comprehensively processed to obtain the concentration estimate C of the harmful gases. calc for: ； Among them, C sensor,i is the real-time concentration of harmful gases detected by the i-th integrated gas detector, K position,i is the integrated gas detector position weight, λ is the time decay factor, t i is the data update interval of the integrated gas detector, v is the average indoor air velocity, and A, b, and c are the diffusion attenuation coefficients.

4. The laboratory air conditioning method according to claim 3, characterized in that: When regulating the exhaust volume of ventilation equipment, the estimated concentration of harmful gases is used as the key regulating factor, and the exhaust volume Q of the ventilation equipment regulated by this regulating factor is req for: ； Where K is the ventilation response coefficient, C target is the target safety concentration, V room is the laboratory volume; Then, the exhaust volume is used as the key control factor, and the wind speed control parameter V of the ventilation equipment is obtained by controlling the key control factor. vent for: ； Among them, A vent is the cross-sectional area of ​​the tuyere, v safe For safe flow rate.

5. The laboratory air conditioning method according to claim 1, characterized in that: When locating the position coordinates of the harmful gas source, the position coordinates of the harmful gas source can be obtained based on the harmful gas concentration monitored by multiple integrated gas sensors combined with a distributed static sensor array positioning algorithm.

6. The laboratory air conditioning method according to claim 1, characterized in that: When adjusting and controlling the vent angle of the ventilation equipment, the position coordinates of the harmful gas source combined with the vent position coordinates of the ventilation equipment are used as key control factors. The vent angle control parameter θ of the ventilation equipment obtained by controlling the key control factors is: ； Among them, Xs ource is the location coordinate of the harmful gas source, X vent is the coordinate of the air outlet position, and h is the installation height of the integrated gas detector.

7. A control system using the laboratory air conditioning method according to any one of claims 1 to 6, characterized in that: include: Detection and acquisition module, data transmission module, data storage module, core processing and analysis module and execution control module; Detection and acquisition module: including wind speed sensor and integrated gas detector. The wind speed sensor is used to monitor and collect the air flow rate in the laboratory in real time. The integrated gas detector is used to monitor and collect the concentration of harmful gases in the laboratory in real time. Data transmission module: used to transmit the information data collected by the detection and acquisition module to the data storage module, and at the same time used to transmit the control command signal issued by the core processing and analysis module to the execution control module; Data storage module: used to receive information data transmitted by the data transmission module and store the received information data; Core processing and analysis module: used to process and analyze the information data stored in the data storage module to obtain the estimated concentration of harmful gases in the laboratory, and compare the estimated concentration value with the target safety concentration value and the reverse, and determine whether the estimated concentration value of harmful gases exceeds the standard. After determining that the estimated concentration value of harmful gases exceeds the standard, the estimated concentration value of harmful gases is used as the core indicator to process and calculate the wind speed and air outlet angle control parameters of the ventilation equipment, and send the control parameters as control instructions to the execution control module; Execution control module: After receiving the control command signal sent by the core processing and analysis module, it is used to control the wind speed and wind angle of the ventilation equipment according to the wind speed and wind angle adjustment parameters in the control command.

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