An air intake regulation control method and system for a laboratory ventilation system

Abstract

The present invention relates to the technical field of air conditioning management, and discloses an air intake adjustment control method and system for a laboratory ventilation system, including the following steps: configuring a heat transfer plate between the exhaust duct and the intake duct in the ventilation system, so that the air heat in the exhaust duct can be transferred to the air in the intake duct through the heat transfer plate to achieve heat recovery; setting a bypass channel on the intake duct and configuring a valve in the bypass channel, the valve can control the fresh air to enter the laboratory interior from either the intake duct or the bypass channel, and the bypass channel is separately arranged from the heat transfer plate. Through the design of the bypass channel, the system of the present invention can flexibly adjust the air flow path according to the temperature change inside the laboratory and the temperature difference of the external environment. The design of the bypass channel can prevent the fresh air from contacting the surface of the heat transfer plate, so that the temperature of the fresh air is not affected by the low temperature when the laboratory generates a low temperature inside.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning management, and particularly to an air intake regulation control method and system for a laboratory ventilation system. Background Art

[0002] A laboratory ventilation system is a device and technical system for ensuring the air quality, temperature control, and safety in a laboratory. It mainly regulates the introduction, discharge, and flow of air to ensure that harmful gases, pollutants, odors, heat, etc. in the laboratory can be effectively discharged, while providing sufficient fresh air to ensure the health and safety of laboratory personnel.

[0003] In a laboratory, the laboratory is maintained at a reasonable temperature by heating the air. Since the laboratory requires a large amount of fresh air to maintain air quality and safety, the air discharged by the ventilation system is usually heated air. If not recovered, this energy will be wasted. Summary of the Invention

[0004] Aiming at the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an air intake regulation control method and system for a laboratory ventilation system, which can recover heat from the exhaust air in the laboratory ventilation system and transfer it to the fresh air, thereby reducing the energy required to heat the fresh air and achieving the effect of cost reduction.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An air intake regulation control method for a laboratory ventilation system, comprising the following steps:

[0006] Configure a heat transfer plate between the exhaust air duct and the fresh air duct in the ventilation system, so that the air heat in the exhaust air duct can be transferred to the air in the fresh air duct through the heat transfer plate. Set up a bypass channel on the fresh air duct and configure a valve in the bypass channel. The valve can control the fresh air to enter the laboratory interior from either the fresh air duct or the bypass channel, and the bypass channel is arranged separately from the heat transfer plate;

[0007] Use a temperature sensor to monitor the temperature value when the air in the laboratory enters the exhaust air duct and the temperature value when the outside fresh air enters the fresh air duct, and compare the size of the temperature value when the air enters the exhaust air duct with the temperature value when the air enters the fresh air duct: when the temperature value when the air enters the exhaust air duct is greater than or equal to the temperature value when the air enters the fresh air duct, maintain the heat transfer; when the temperature value when the air enters the exhaust air duct is less than the temperature value when the air enters the fresh air duct, record the duration of the air in the exhaust air duct remaining in a low-temperature state, and control the fresh air to enter the laboratory through the bypass channel by the valve;

[0008] Set the first-level temperature difference level, the second-level temperature difference level, and the third-level temperature difference level, and set the corresponding maximum acceptable buffer time for each temperature difference level. The maximum acceptable buffer time corresponding to the first-level temperature difference level is the longest, and the maximum acceptable buffer time corresponding to the third-level temperature difference level is the shortest;

[0009] Set the interval determination duration. When the duration of the air in the exhaust duct remaining in the low-temperature state is less than or equal to the maximum acceptable buffer time set for the corresponding temperature difference level, start timing from the state when the air temperature value in the exhaust duct returns to a state not lower than the air temperature value in the intake duct until the next time the air temperature value in the exhaust duct is lower than the air temperature value in the intake duct to end the timing. Compare the total timed duration with the interval determination duration. When the total timed duration is less than or equal to the interval determination duration, mark the low-temperature state of the air temperature in the exhaust duct this time as a continuous low-temperature event, and execute the low-temperature effect accumulation judgment strategy: Set the continuous low-temperature times threshold, count the number of continuous low-temperature events occurring within the preset time, and compare the number of continuous low-temperature events with the continuous low-temperature times threshold. If the number of continuous low-temperature events is less than the continuous low-temperature times threshold, when the air temperature value in the exhaust duct is lower than the fresh air within the preset time, it is all considered as the third-level temperature difference to improve the sensitivity to temperature fluctuations; If the number of continuous low-temperature events is greater than or equal to the continuous low-temperature times threshold, then within the interval determination duration, it is not allowed for the air temperature value in the exhaust duct to be lower than the fresh air temperature value in the intake duct to appear again. If it appears, control the fresh air to enter the laboratory through the bypass channel by the valve.

[0010] In some embodiments, subtract the air temperature value in the intake duct from the air temperature value in the exhaust duct to obtain the actual temperature difference. If the actual temperature difference falls within the preset temperature drop range, mark the air temperature in the exhaust duct this time as the second-level temperature difference level; If the actual temperature difference is less than the preset temperature drop range, mark the air temperature in the exhaust duct this time as the first-level temperature difference level; If the actual temperature difference is greater than the preset temperature drop range, mark the air temperature in the exhaust duct this time as the third-level temperature difference level.

[0011] In some embodiments, after monitoring that the temperature value of the air entering the exhaust duct is less than the temperature value of the air entering the intake duct, compare the duration of the air in the exhaust duct remaining in the low-temperature state with the maximum acceptable buffer time set for the corresponding temperature difference level, and make corresponding responses according to the comparison results.

[0012] In some embodiments, if the duration for which the air in the exhaust duct remains in a low-temperature state is less than or equal to the maximum acceptable buffer time set for the corresponding temperature difference level, the normal use of the heat transfer plate is maintained to ensure the normal operation of the fresh air heating function; if the duration for which the air in the exhaust duct remains in a low-temperature state is greater than the maximum acceptable buffer time set for the corresponding temperature difference level, the fresh air is controlled to enter the laboratory through the bypass channel by means of a valve.

[0013] The present invention also provides the following technical solution: An air intake adjustment control system for a laboratory ventilation system, comprising:

[0014] An energy recovery module, which includes arranging a heat transfer plate between the exhaust duct and the intake duct in the ventilation system, such that the heat of the air in the exhaust duct can be transferred to the air in the intake duct through the heat transfer plate to achieve heat recovery;

[0015] An air guiding module, which includes providing a bypass channel on the intake duct and arranging a valve in the bypass channel. The valve can control the fresh air to selectively enter the interior of the laboratory from the intake duct or the bypass channel, and the bypass channel is separately arranged from the heat transfer plate;

[0016] A temperature monitoring module, which includes using a temperature sensor to monitor the temperature value of the air in the laboratory when it enters the exhaust duct, and at the same time using a temperature sensor to monitor the temperature value of the outside fresh air when it enters the intake duct, and comparing the magnitude of the temperature value of the air when it enters the exhaust duct with the temperature value of the air when it enters the intake duct;

[0017] A channel selection module, which includes maintaining heat transfer if the temperature value of the air when it enters the exhaust duct is greater than or equal to the temperature value of the air when it enters the intake duct; if the temperature value of the air when it enters the exhaust duct is less than the temperature value of the air when it enters the intake duct, the fresh air is controlled to enter the laboratory through the bypass channel by means of a valve.

[0018] The present invention further provides a computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the above-mentioned air intake adjustment control method for a laboratory ventilation system.

[0019] The technical solution provided by the present invention has the following beneficial effects compared with the prior art:

[0020] Firstly, through the arrangement of the heat transfer plate, the present invention can transfer the heat of the hot air in the exhaust duct to the intake duct, so as to achieve the effect of energy recovery and reduce the energy consumption required for externally heating the fresh air.

[0021] Second, through the design of the bypass channel, the system of the present invention can flexibly adjust the air circulation path according to the temperature change inside the laboratory and the temperature difference of the external environment. The design of the bypass channel can prevent fresh air from contacting the surface of the heat transfer plate, ensuring that the temperature of the fresh air is not affected by the low temperature when the laboratory has a low temperature inside.

[0022] Third, by setting the maximum acceptable buffer time, the present invention allows temperature fluctuations within a short period. It will only switch the bypass channel when the temperature anomaly continues to exceed the set threshold, rather than immediately triggering valve adjustment, thus maintaining the stability of the system and the energy utilization efficiency, and being more suitable for the complex and changeable environment of the laboratory.

[0023] Fourth, through setting the cumulative judgment strategy of the low-temperature effect and the statistical analysis of continuous low-temperature events, the system will only take measures such as increasing the monitoring sensitivity or switching the bypass channel when low-temperature events occur frequently and their impact on the heat transfer plate has not been effectively restored. This refined management method ensures efficient operation in a complex laboratory environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic flowchart of the air intake regulation control method of a laboratory ventilation system of the present invention;

[0025] Figure 2 It is a schematic module diagram of the air intake regulation control system of a laboratory ventilation system of the present invention;

[0026] Figure 3 It is a schematic design diagram of the air intake and exhaust ducts of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "one" cannot be understood as a limitation on the number.

[0029] The present invention provides an air intake regulation control method for a laboratory ventilation system, as shown in Figure 1 and Figure 3 The method includes the following steps:

[0030] Step 1: Configure multiple heat transfer plates between the exhaust duct and the intake duct in the ventilation system, so that the heat of the air in the exhaust duct can be transferred to the air in the intake duct through the heat transfer plates, realizing heat recovery. In a laboratory ventilation system, the air in the exhaust duct usually carries a certain amount of heat because the laboratory needs to maintain a specific temperature range for experiments. When fresh air enters the laboratory through the intake duct, it is usually at the outside air temperature. Through the heat transfer plates, the heat in the exhaust duct is transferred to the fresh air, appropriately increasing the temperature of the fresh air without mixing the air streams, thereby reducing the external energy required to heat the fresh air. In practical applications, multiple heat transfer plates are embedded between the exhaust duct and the intake duct. The heat transfer plates work by utilizing the high thermal conductivity of metals to allow two mutually isolated airflows to exchange heat through the heat transfer plates. Also, the heat transfer plates should be set in a sealed space or duct to avoid excessive heat loss during heat transfer between the exhaust duct and the intake duct.

[0031] Step 2: Set up a bypass channel on the intake duct and configure a valve in the bypass channel. The valve can control the fresh air to enter the laboratory interior either from the intake duct or the bypass channel. Moreover, the bypass channel is arranged separately from the heat transfer plates, so that when the fresh air enters the laboratory through the bypass channel, it will not come into contact with the surface of the heat transfer plates.

[0032] Step 3: Use a temperature sensor to monitor the temperature value of the air in the laboratory when it enters the exhaust duct, and at the same time use a temperature sensor to monitor the temperature value of the fresh outside air when it enters the intake duct. Compare the temperature value of the air when it enters the exhaust duct with the temperature value of the air when it enters the intake duct. If the temperature value of the air when it enters the exhaust duct is greater than or equal to the temperature value of the air when it enters the intake duct, it means that the air in the exhaust duct can transfer heat through the heat transfer plate to the intake duct to heat the fresh air and maintain heat transfer. If the temperature value of the air when it enters the exhaust duct is less than the temperature value of the air when it enters the intake duct, it means that the air temperature in the exhaust duct is lower than the fresh air in the intake duct. At this time, the heat transfer plate will instead cool the air in the intake duct. Then, control the fresh air to enter the laboratory through the bypass channel to avoid contact between the fresh air and the surface of the heat transfer plate. Under normal circumstances, when the fresh outside air enters the laboratory through the intake duct, it is generally low-temperature air and is discharged from the exhaust duct after being heated by the heating equipment in the laboratory. However, if the laboratory operates a low-temperature cooling system, refrigeration equipment, or uses low-temperature substances such as liquid nitrogen according to experimental requirements, it may cause the air in the laboratory to be cooled during circulation in the laboratory, resulting in the temperature of the air discharged into the exhaust duct being lower than the fresh outside air. Although the heat transfer plate itself cannot be closed, bypassing the heat transfer plate by introducing fresh air into the bypass channel can prevent the adverse effect of cooling the fresh air.

[0033] Preset a cooling range based on the historical data of the impact of temperature difference on the heat transfer plate, and set multiple levels of temperature difference grades. For example, set three temperature difference grades, namely the first-level temperature difference grade, the second-level temperature difference grade, and the third-level temperature difference grade. When it is monitored that the temperature value of the air when it enters the exhaust duct is less than the temperature value of the air when it enters the intake duct, calculate the difference between the air temperature value in the intake duct and the air temperature value in the exhaust duct to obtain the actual temperature difference. If the actual temperature difference falls within the preset cooling range, mark the air temperature in the exhaust duct this time as the second-level temperature difference grade; if the actual temperature difference is less than the preset cooling range, mark the air temperature in the exhaust duct this time as the first-level temperature difference grade; if the actual temperature difference is greater than the preset cooling range, mark the air temperature in the exhaust duct this time as the third-level temperature difference grade. Moreover, set corresponding maximum acceptable buffer times for multiple temperature difference grades from more to less. After it is monitored that the temperature value of the air when it enters the exhaust duct is less than the temperature value of the air when it enters the intake duct, record the duration of the air in the exhaust duct remaining in a low-temperature state, and compare the duration of the air in the exhaust duct remaining in a low-temperature state with the maximum acceptable buffer time set for the corresponding temperature difference grade, and make corresponding responses according to the comparison results.

[0034] Specifically, if the duration for which the air in the exhaust duct remains at a low temperature is less than or equal to the maximum acceptable buffer time set for the corresponding temperature difference level, it means that although the temperature value of the air entering the exhaust duct is lower than the temperature of the fresh air in the intake duct, it is a short-term temperature fluctuation, and the impact on the heat transfer plate is limited. Although the low temperature reduces the heating efficiency of the heat transfer plate, it does not cause a direct cooling effect. Therefore, the normal use of the heat transfer plate is maintained to ensure the normal operation of the fresh air heating function. If the duration for which the air in the exhaust duct remains at a low temperature is greater than the maximum acceptable buffer time set for the corresponding temperature difference level, it means that the temperature value of the air entering the exhaust duct has remained at a low temperature for a relatively long time, which is sufficient to cause the heat transfer plate to cool the fresh air. At this time, to avoid inappropriate cooling of the fresh air, the fresh air is controlled to enter the laboratory through the bypass channel by a valve. For example, the maximum acceptable buffer times of 20 seconds, 15 seconds, and 10 seconds are set for the first-level, second-level, and third-level temperature difference levels respectively. The preset temperature drop range is 5 - 10°C. When it is monitored that the temperature value of the air entering the exhaust duct is lower than the temperature value of the air entering the intake duct, and the temperature value of the air in the exhaust duct is 8°C and the temperature value of the air in the intake duct is 15°C, the actual temperature difference can be obtained as 7°C. Therefore, it falls into the second-level temperature difference level. When the air in the exhaust duct remains at a low temperature for more than 15 seconds, the fresh air is made to enter the laboratory through the bypass channel by a valve. Additionally, it should be noted that the actual temperature difference will change continuously. For example, when the actual temperature difference exceeds 10°C, this low-temperature event will be marked as the third-level temperature difference level. Even if the actual temperature difference subsequently drops back within 10°C, the highest historical temperature difference level will still be used for determination and subsequent operations. The reason for the above design is that during the use of the laboratory, short-term air temperature fluctuations are common. For example, factors such as opening and closing doors, equipment operation, or experimental reactions may cause an instantaneous drop in the exhaust temperature. If it is too sensitive to these short-term low-temperature changes and switches the bypass channel frequently, it will result in energy waste, unstable system operation, and additional mechanical wear. Moreover, since the larger the temperature difference, the more significant the impact of the low-temperature air on the heat transfer plate, the maximum acceptable buffer times for different temperature difference levels are different. The higher the temperature difference level, the larger the temperature difference, and thus the more substantial impact on the heat transfer plate will be caused in a shorter time. Through the grading method, it is possible to more accurately determine whether the operation of the heat transfer plate is interfered by low temperature.

[0035] As another preferred embodiment of the present invention, an interval determination duration is set. When the duration for which the air in the exhaust duct remains in a low-temperature state is less than or equal to the maximum acceptable buffer time set for the corresponding temperature difference level, timing starts when the air temperature value in the exhaust duct returns to a state not lower than the temperature value in the intake duct, and ends when the air temperature value in the exhaust duct is lower than the temperature value in the intake duct again next time. The total duration of the timing is compared with the interval determination duration: If the total duration of the timing is greater than the interval determination duration, it indicates that the interval between two consecutive occurrences of the air temperature in the intake duct being lower than that of the fresh air is relatively long, and the influence of the previous low-temperature air on the heat transfer plate has disappeared, so no reaction is made; If the total duration of the timing is less than or equal to the interval determination duration, it indicates that the interval between two consecutive occurrences of the air temperature in the intake duct being lower than that of the fresh air is relatively short. In the case where the influence of the previous low-temperature air on the heat transfer plate has not been eliminated, the low-temperature air in the exhaust duct this time comes into contact with the surface of the heat transfer plate again. Then, the low-temperature state of the air temperature in the exhaust duct this time is marked as a continuous low-temperature event, and a low-temperature effect accumulation judgment strategy is executed. The low-temperature effect accumulation judgment strategy includes setting a threshold for the number of consecutive low-temperature occurrences, counting the number of continuous low-temperature events within a preset time, and comparing the number of continuous low-temperature events with the threshold for the number of consecutive low-temperature occurrences. If the number of continuous low-temperature events is less than the threshold for the number of consecutive low-temperature occurrences, it indicates that the number of consecutive temperature fluctuations in the exhaust duct is relatively small, and only a relatively low impact is caused to the normal operation of the heat transfer plate. Then, when the air temperature value in the exhaust duct is lower than that of the fresh air within the preset time, it is all determined as a third-level temperature difference; If the number of continuous low-temperature events is greater than or equal to the threshold for the number of consecutive low-temperature occurrences, it indicates that the number of consecutive temperature fluctuations in the exhaust duct is relatively large, and the frequent entry of continuous low-temperature air will cause insufficient temperature recovery ability of the heat transfer plate. Then, it is not allowed for the air temperature value in the exhaust duct to be lower than the fresh air temperature value in the intake duct to occur again within the interval determination duration. Otherwise, the fresh air is controlled to enter the laboratory through the bypass channel by a valve until the air temperature value in the exhaust duct is greater than the fresh air temperature value and remains so for more than the preset time, and then the fresh air is controlled to enter the laboratory through the intake duct by a valve. By setting the threshold for the number of consecutive low-temperature occurrences, the system can identify and count the number of consecutive occurrences of low-temperature events. If the low-temperature state in the exhaust duct is only short-term fluctuations, the system can judge the degree of its influence on the heat transfer plate according to the number of times. Only when continuous low-temperature events occur frequently will further protection measures be initiated, avoiding frequent switching of the energy recovery system due to short-term and single temperature fluctuations. And in the case where continuous low-temperature times do not occur frequently, the sensitivity of temperature fluctuation recognition can also be improved by increasing the subsequent temperature difference level, avoiding the risk of the heat transfer plate cooling the fresh air.

[0036] Generally speaking, the present invention aims to design an air intake regulation control method for a laboratory ventilation system. Aiming at the problem that the laboratory ventilation system cannot recover the energy of the hot air discharge, resulting in energy waste, the present invention can transfer the heat of the hot air in the exhaust duct to the intake duct through the setting of the heat transfer plate, so as to achieve the effect of energy recovery and reduce the energy consumption required for heating fresh air externally. Through the design of the bypass channel, the system can flexibly adjust the air flow path according to the temperature change inside the laboratory and the temperature difference of the external environment. The design of the bypass channel can prevent fresh air from contacting the surface of the heat transfer plate, so that the temperature of fresh air is not affected by low temperature when the interior of the laboratory generates low temperature conditions. By monitoring the air temperatures of the intake duct and the exhaust duct in real time, the system can automatically judge whether the air needs to be heated through the heat transfer plate or enter through the bypass channel. This automatic control method not only improves the efficiency of the system, but also reduces the need for manual intervention. By setting the maximum acceptable buffer time to allow temperature fluctuations within a short period, the bypass channel is only switched when the temperature anomaly continues to exceed the set threshold, rather than immediately triggering valve adjustment, thus maintaining the stability and energy utilization efficiency of the system, and being more suitable for the complex and changeable environment of the laboratory. And through setting the low temperature effect accumulation judgment strategy and the statistical analysis of continuous low temperature events, the response ability of the system is further optimized. Only when low temperature events occur frequently and their impact on the heat transfer plate is not effectively restored, the system will take measures such as increasing the monitoring sensitivity or switching the bypass channel. This refined management method ensures efficient operation in a complex laboratory environment.

[0037] Embodiments disclosed by the present invention. The processes described above with reference to the flowcharts can be implemented as computer software programs. Embodiments disclosed by the present invention include a computer program product, which includes a computer program carried on a computer-readable medium. The computer program contains program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network through a communication part, and / or installed from a removable medium. When the computer program is executed by a central processing unit, the above-mentioned functions defined in the methods of the present application are performed. It should be noted that the computer-readable medium mentioned above in the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of a computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wire segments, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program codes. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, and the computer-readable medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program codes contained on the computer-readable medium can be transmitted by any suitable medium, including but not limited to: wireless segments, wire segments, optical cables, RF, etc., or any suitable combination of the above.

[0038] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a part of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that, in some alternative implementations, the functions denoted in the blocks may occur in a different order than that denoted in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, may be implemented by a dedicated hardware-based system that performs the specified functions or operations, or may be implemented by a combination of dedicated hardware and computer instructions.

[0039] Those skilled in the art should understand that the above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application.

Claims

1. A method for adjusting and controlling the air intake of a laboratory ventilation system, characterized in that: include: A heat transfer plate is arranged between the exhaust duct and the air inlet duct in the ventilation system, so that the heat of the air in the exhaust duct can be transferred to the air in the air inlet duct through the heat transfer plate. A bypass channel is arranged on the air inlet duct, and a valve is arranged in the bypass channel. The valve can control the fresh air to enter the laboratory from the air inlet duct or the bypass channel, and the bypass channel is arranged separately from the heat transfer plate. Use temperature sensors to monitor the temperature of the air in the laboratory when it enters the exhaust duct and the temperature of the fresh air from the outside when it enters the air inlet duct, and compare the temperature of the air when it enters the exhaust duct with the temperature of the air when it enters the air inlet duct: when the temperature of the air when it enters the exhaust duct is greater than or equal to the temperature of the air when it enters the air inlet duct, keep the heat transfer; when the temperature of the air when it enters the exhaust duct is less than the temperature of the air when it enters the air inlet duct, record the time the air in the exhaust duct remains in a low temperature state, and control the fresh air to enter the laboratory from the bypass channel through the valve; Set the first-level temperature difference level, the second-level temperature difference level and the third-level temperature difference level, and set the corresponding maximum acceptable buffer time for each temperature difference level, and the maximum acceptable buffer time corresponding to the first-level temperature difference level is the longest, and the maximum acceptable buffer time corresponding to the third-level temperature difference level is the shortest; Set the interval judgment time. When the time that the air in the exhaust duct remains in a low temperature state is less than or equal to the maximum acceptable buffer time set for the corresponding temperature difference level, start timing from the time when the air temperature value in the exhaust duct recovers to a state not lower than the temperature value in the inlet duct, and end timing when the air temperature value in the exhaust duct is lower than the temperature value in the inlet duct next time. Compare the total time with the interval judgment time. When the total time is less than or equal to the interval judgment time, mark the low temperature state of the air temperature in the exhaust duct as a continuous low temperature event, and execute the low temperature effect accumulation judgment strategy: set a continuous low temperature number threshold, count the number of continuous low temperature events within the preset time, and compare the number of continuous low temperature events with the continuous low temperature number threshold. If the number of continuous low temperature events is less than the continuous low temperature number threshold, when the air temperature value in the exhaust duct is lower than the fresh air within the preset time, it is identified as a third-level temperature difference to increase the sensitivity to temperature fluctuations. If the number of consecutive low temperature events is greater than or equal to the consecutive low temperature threshold, the phenomenon that the air temperature in the exhaust duct is lower than the fresh air temperature in the inlet duct is not allowed to appear again within the interval judgment time. If it occurs, the fresh air will be controlled by the valve to enter the laboratory from the bypass channel.

2. The air intake control method of a laboratory ventilation system according to claim 1 is characterized in that: The difference between the air temperature value in the air inlet duct and the air temperature value in the exhaust duct is calculated to obtain the actual temperature difference. If the actual temperature difference falls within the preset temperature reduction range, the air temperature in the exhaust duct is marked as the second-level temperature difference level. If the actual temperature difference is less than the preset temperature reduction range, the air temperature in the exhaust duct will be marked as the first-level temperature difference level; if the actual temperature difference is greater than the preset temperature reduction range, the air temperature in the exhaust duct will be marked as the third-level temperature difference level.

3. The air intake control method of a laboratory ventilation system according to claim 2 is characterized in that: After monitoring that the temperature value of the air when entering the exhaust duct is lower than the temperature value of the air when entering the inlet duct, the length of time the air in the exhaust duct remains in a low temperature state is compared with the maximum acceptable buffer time set for the corresponding temperature difference level, and a corresponding response is made based on the comparison result.

4. The air intake control method of a laboratory ventilation system according to claim 3 is characterized in that: If the time that the air in the exhaust duct remains in a low temperature state is less than or equal to the maximum acceptable buffer time set for the corresponding temperature difference level, the heat transfer plate is kept in normal use to ensure the normal operation of the fresh air heating function; if the time that the air in the exhaust duct remains in a low temperature state is greater than the maximum acceptable buffer time set for the corresponding temperature difference level, the valve is used to control the fresh air to enter the laboratory from the bypass channel.

5. An air intake control system for a laboratory ventilation system, characterized in that: A method for controlling air intake of a laboratory ventilation system according to any one of claims 1 to 4, comprising: The energy recovery module includes a heat transfer plate disposed between the exhaust duct and the air inlet duct in the ventilation system, so that the heat of the air in the exhaust duct can be transferred to the air in the air inlet duct through the heat transfer plate, thereby realizing heat recovery; The air guide module includes a bypass channel arranged on the air inlet duct and a valve arranged in the bypass channel, the valve can control the fresh air to enter the laboratory from the air inlet duct or the bypass channel, and the bypass channel is arranged separately from the heat transfer plate; The temperature monitoring module includes using a temperature sensor to monitor the temperature of the air in the laboratory when it enters the exhaust duct, and using a temperature sensor to monitor the temperature of the fresh air from the outside when it enters the air inlet duct, and comparing the temperature of the air when it enters the exhaust duct with the temperature of the air when it enters the air inlet duct; The channel selection module includes: if the temperature value of the air when entering the exhaust duct is greater than or equal to the temperature value of the air when entering the inlet duct, maintaining heat transfer; if the temperature value of the air when entering the exhaust duct is lower than the temperature value of the air when entering the inlet duct, controlling the fresh air to enter the laboratory from the bypass channel through a valve.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the air intake adjustment control method of a laboratory ventilation system as described in any one of claims 1 to 4.

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