Air inlet regulation control method and system of laboratory ventilation system

Abstract

The invention relates to the technical field of air conditioning management, and discloses an air inlet regulation control method and system for a laboratory ventilation system, and the method comprises the following steps: configuring a heat transfer plate between an exhaust pipeline and an air inlet pipeline in the ventilation system, so that the air heat in the exhaust pipeline can be transferred to the air in the air inlet pipeline through the heat transfer plate; the heat recovery is realized; a bypass channel is arranged on the air inlet pipeline, a valve is arranged in the bypass channel, the valve can control fresh air to selectively enter the laboratory from the air inlet pipeline or the bypass channel, and the bypass channel and the heat transfer plate are arranged separately. Through the design of the bypass channel, the system can flexibly adjust the air circulation path according to the temperature change in the laboratory and the temperature difference of the external environment, and the design of the bypass channel can prevent fresh air from making contact with the surface of the heat transfer plate; and the temperature of fresh air is not influenced by low temperature under the condition that the low temperature is generated in the laboratory.

Description

Technical Field

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

[0002] Laboratory ventilation system is a kind of equipment and technical system to ensure the air quality, temperature control and safety in the 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 enough fresh air to ensure the health and safety of the experimenters.

[0003] In the laboratory, the air is heated to keep it at a reasonable temperature. Because the laboratory requires a large amount of fresh air to maintain air quality and safety, the air exhausted by the ventilation system is usually heated air. If it is not recycled, this energy will be wasted. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide an air intake regulation control method and system for a laboratory ventilation system, so as to recover heat from exhaust air in the laboratory ventilation system and transfer it to fresh air, thereby reducing the energy required to heat the fresh air and achieving the effect of reducing costs.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: an air intake adjustment control method for a laboratory ventilation system, comprising the following steps: 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, thereby realizing heat recovery; A bypass channel is set 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 a temperature sensor to monitor the temperature of the air in the laboratory when it enters the exhaust duct, and use a temperature sensor to monitor the temperature of the fresh air from the outside when it enters the air inlet duct. 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. If 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 inlet duct, the heat transfer is maintained; if the temperature of the air when it enters the exhaust duct is lower than the temperature of the air when it enters the inlet duct, the valve is used to control fresh air to enter the laboratory from the bypass channel.

[0006] In some embodiments, multiple levels of temperature difference grades are set, namely, level one temperature difference grade, level two temperature difference grade, and level three temperature difference grade, and corresponding maximum acceptable buffer times are set for the multiple temperature difference grades from most to least.

[0007] In some embodiments, 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 an actual temperature difference. If the actual temperature difference falls within a preset temperature reduction range, the air temperature in the exhaust duct is marked as a 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 is marked as a 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 is marked as a third-level temperature difference level.

[0008] In some embodiments, 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 time for which the air in the exhaust duct remains in a low temperature state is recorded, and the time for which 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.

[0009] In some embodiments, 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 fresh air is controlled by a valve to enter the laboratory from the bypass channel.

[0010] In some embodiments, an interval determination time is set. When the time during 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 is started 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. The timing ends when the air temperature value in the exhaust duct is lower than the temperature value in the inlet duct next time. The total time measured is compared with the interval determination time, and a corresponding response is made according to the comparison result.

[0011] In some embodiments, if the total timing duration is greater than the interval determination duration, no reaction is performed; if the total timing duration is less than or equal to the interval determination duration, the low temperature state of the air temperature in the exhaust duct is marked as a continuous low temperature event, and the low temperature effect accumulation judgment strategy is executed.

[0012] In some embodiments, the low temperature effect accumulation judgment strategy includes setting a continuous low temperature number threshold, counting the number of continuous low temperature events within a preset time, and comparing 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, then within the preset time, when the air temperature value in the exhaust duct is lower than the fresh air, it is recognized as a third-level temperature difference; if the number of continuous low temperature events is greater than or equal to the continuous low temperature number threshold, the phenomenon that the air temperature value in the exhaust duct is lower than the fresh air temperature value in the air inlet duct is not allowed to appear again within the interval judgment time, otherwise the fresh air is controlled by the valve to enter the laboratory from the bypass channel.

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

[0014] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the above-mentioned air intake adjustment control method of a laboratory ventilation system.

[0015] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: Firstly, the present invention can transfer the heat of the hot air in the exhaust duct to the air inlet duct through the arrangement of the heat transfer plate, so as to achieve the effect of energy recovery and reduce the energy consumption required for external heating of the fresh air.

[0016] Secondly, through the design of the bypass channel, the system of the present invention can flexibly adjust the air circulation path according to the temperature changes inside the laboratory and the temperature differences 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 when the laboratory generates low temperature inside, the temperature of the fresh air is not affected by the low temperature.

[0017] Thirdly, the present invention allows temperature fluctuations in a short period of time by setting a maximum acceptable buffer time. The bypass channel will only be switched when the temperature anomaly continues to exceed the set threshold, and the valve adjustment will not be triggered immediately, thereby maintaining the stability of the system and energy utilization efficiency, and is more suitable for the complex and changeable environment of the laboratory.

[0018] Fourthly, the present invention sets a low-temperature effect accumulation judgment strategy and a statistical analysis of continuous low-temperature events. Only when low-temperature events occur frequently and their impact on the heat transfer plate is not effectively restored, the system will take measures to increase monitoring sensitivity or bypass channel switching. This sophisticated management method ensures efficient operation in a complex laboratory environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic flow chart of an air intake adjustment control method for a laboratory ventilation system according to the present invention; Figure 2 A schematic diagram of a module of an air intake adjustment control system of a laboratory ventilation system of the present invention; Figure 3 It is a schematic diagram of the design of the air inlet and exhaust ducts of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It is to 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 may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0022] The present invention provides a method for adjusting and controlling the air intake of a laboratory ventilation system. Figure 1 and Figure 3 As shown, the method comprises the following steps: Step 1: multiple heat transfer plates are 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 plates, thereby realizing heat recovery. In the laboratory ventilation system, the air in the exhaust duct usually has 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 air inlet duct, it is usually the temperature of the outside air. Through the heat transfer plate, the heat in the exhaust duct is transferred to the fresh air, and the temperature of the fresh air is appropriately increased without mixing the air flow, thereby reducing the external energy required to heat the fresh air; in actual application, multiple heat transfer plates are embedded between the exhaust duct and the air inlet duct. The working mode of the heat transfer plate is to use the high thermal conductivity of metal to allow two isolated air flows to exchange heat through the heat transfer plate. The heat transfer plate should also be set in a sealed space or duct to avoid excessive loss of heat when transferring between the exhaust duct and the air inlet duct.

[0023] Step 2: a bypass channel is provided on the air inlet duct, and a valve is arranged in the bypass channel. The valve can control whether fresh air enters the laboratory from the air inlet duct or the bypass channel. The bypass channel is arranged separately from the heat transfer plate, so that the fresh air will not contact the surface of the heat transfer plate when entering the laboratory through the bypass channel. Step 3: Use a temperature sensor to monitor the temperature of the air in the laboratory when it enters the exhaust duct, and use a temperature sensor to monitor the temperature of the fresh air from the outside when it enters the air inlet duct. 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. If 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, it means that the air in the exhaust duct can transfer heat to the air inlet duct through the heat transfer plate to heat the fresh air and maintain heat transfer; if 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, it means that the air temperature in the exhaust duct is lower than that in the air inlet duct. Fresh air, at this time, the heat transfer plate will cool down the air in the air inlet duct. The valve is used to control the fresh air to enter the laboratory from the bypass channel to avoid the fresh air from contacting the surface of the heat transfer plate. Under normal circumstances, when the fresh air from the outside enters the laboratory through the air inlet duct, it is generally low-temperature air, and is heated by the heating equipment in the laboratory and then discharged from the exhaust duct. However, if the laboratory runs a low-temperature cooling system or freezing equipment or uses low-temperature materials such as liquid nitrogen according to the experimental requirements, the air in the laboratory may be cooled when circulating in the laboratory, so that the temperature of the air is lower than that of the fresh air outside when it is discharged into the exhaust duct. Although the heat transfer plate itself cannot be closed, by introducing fresh air into the bypass channel to bypass the heat transfer plate, it can prevent the adverse effect of cooling the fresh air.

[0024] A temperature reduction range is preset based on historical data of the impact of temperature difference on the heat transfer plate, and multiple levels of temperature difference grades are set. For example, three temperature difference grades are set, namely, the first temperature difference grade, the second temperature difference grade and the third temperature difference grade. 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 inlet duct, the difference between the air temperature value in the 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 temperature difference grade; if the actual temperature difference is less than the preset temperature reduction range, the air temperature in the exhaust duct is marked as the first temperature difference grade; if the actual temperature difference is greater than the preset temperature reduction range, the air temperature in the exhaust duct is marked as the third temperature difference grade. In addition, a corresponding maximum acceptable buffer time is set for multiple temperature difference levels from most to least. 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 time for which the air in the exhaust duct remains in a low temperature state is recorded, and the time for which 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 corresponding responses are made according to the comparison results.

[0025] Specifically, 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, it means that although the temperature of the air entering the exhaust duct is lower than the temperature of the fresh air in the inlet 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 will not cause a direct cooling effect. Therefore, the heat transfer plate is maintained 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 longer than the maximum acceptable buffer time set for the corresponding temperature difference level, it means that the temperature of the air entering the exhaust duct has remained in a low temperature state for a long time, which is sufficient for the heat transfer plate to cool the fresh air. At this time, in order to avoid improper cooling of the fresh air, the fresh air is controlled by a valve to enter the laboratory from the bypass channel. For example, the maximum acceptable buffer time is set to 20 seconds, 15 seconds and 10 seconds for the first temperature difference level, the second temperature difference level and the third temperature difference level respectively, and the preset temperature reduction range is set to 5-10℃. When the temperature value of the air entering the exhaust duct is lower than the temperature value of the air entering the inlet duct, the air temperature value in the exhaust duct is 8℃, and the air temperature value in the inlet duct is 15℃. The actual temperature difference is 7℃, so it falls into the second temperature difference level. When the air in the exhaust duct continues to be low for more than 15 seconds, the valve allows fresh air to enter the laboratory from the bypass channel. In addition, it should be noted that the actual temperature difference will continue to change. For example, when the actual temperature difference exceeds 10℃, the low temperature event will be marked as the third temperature difference level. Even if the actual temperature difference falls back to 10℃ later, the highest temperature difference level in history will still be used for judgment and subsequent operations. The reason for the above design is that short-term air temperature fluctuations are common during laboratory use. For example, factors such as door opening and closing, equipment operation or experimental reaction may cause the exhaust temperature to drop instantly. If you are too sensitive to these short-term low temperature changes and frequently switch the bypass channel, it will lead to energy waste, unstable system operation and additional mechanical wear. In addition, since the greater the temperature difference, the more significant the impact of low-temperature air on the heat transfer plate, the maximum acceptable buffer time for different temperature difference levels is different. The higher the level of temperature difference, the greater the temperature difference, so it will have a substantial impact on the heat transfer plate in a shorter time. Through the grading method, it can be more accurately judged whether the work of the heat transfer plate is disturbed by low temperature.

[0026] As another preferred embodiment of the present invention, an interval determination time is set. When the time that the air in the exhaust duct maintains a low temperature state is less than or equal to the maximum acceptable buffer time set for the corresponding temperature difference level, timing is started when the air temperature value in the exhaust duct recovers to a state not lower than the temperature value in the inlet duct, and the timing is terminated when the air temperature value in the exhaust duct is lower than the temperature value in the inlet duct next time. The total timing time is compared with the interval determination time. If the total timing time is greater than the interval determination time, it means that the interval between two consecutive occurrences of the air temperature in the inlet duct being lower than the fresh air is long, and the influence of the last low-temperature air on the heat transfer plate has disappeared, and no reaction occurs. If the total timing time is less than or equal to the interval determination time, it means that the interval between two consecutive occurrences of the air temperature in the inlet duct being lower than the fresh air is short, and the influence of the last low-temperature air on the heat transfer plate has not been eliminated, and the low-temperature air in the exhaust duct contacts the surface of the heat transfer plate again, then the low temperature state of the air temperature in the exhaust duct is marked as a continuous low-temperature event, and the low-temperature effect accumulation judgment strategy is executed. The low temperature effect accumulation judgment strategy includes setting a continuous low temperature number threshold, counting the number of continuous low temperature events within a preset time, and comparing 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, it indicates that the number of continuous temperature fluctuations in the exhaust duct is small, and only a small impact on the normal operation of the heat transfer plate is caused. In the preset time, when the air temperature value in the exhaust duct is lower than the fresh air, it is determined as a third-level temperature difference; if the number of continuous low temperature events is greater than or equal to the continuous low temperature number threshold, it indicates that the number of continuous temperature fluctuations in the exhaust duct is large, and the frequent and continuous entry of low-temperature air will cause the temperature recovery capacity of the heat transfer plate to be insufficient. In the interval judgment time, the phenomenon that the air temperature value in the exhaust duct is lower than the fresh air temperature value in the air inlet duct is not allowed to occur again. Otherwise, the fresh air is controlled to enter the laboratory from the bypass channel through the valve until the air temperature value of the exhaust duct is greater than the fresh air temperature value and is maintained for more than the preset time, and then the fresh air is controlled to enter the laboratory from the air inlet duct through the valve. By setting the threshold of the number of consecutive low temperatures, the system can identify and count the number of consecutive low temperature events. If the low temperature state in the exhaust duct is only a short-term fluctuation, the system can judge the degree of its impact on the heat transfer plate based on the number of times. Only when continuous low temperature events occur frequently will further protection measures be initiated, avoiding the frequent switching of the energy recovery system due to short-term, single temperature fluctuations. In the case of infrequent continuous low temperature events, the sensitivity of temperature fluctuation recognition can be improved by improving the subsequent temperature difference level, avoiding the risk of the heat transfer plate cooling the fresh air.

[0027] In general, the present invention aims to design an air intake control method for a laboratory ventilation system. In order to solve the problem that the laboratory ventilation system cannot recover energy from the discharge of hot air, resulting in energy waste, the present invention can transfer the heat of the hot air in the exhaust duct to the air intake duct through the arrangement of the heat transfer plate, so as to achieve the effect of energy recovery and reduce the energy consumption required for external heating of fresh air. 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 avoid the contact between the fresh air and 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 produces a low temperature inside. By real-time monitoring of the air temperature of the air intake duct and the exhaust duct, the system can automatically determine whether the air needs to be heated by 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, the temperature fluctuation is allowed in a short period of time. The bypass channel will only be switched when the temperature abnormality continues to exceed the set threshold, and the valve adjustment will not be triggered immediately, thereby maintaining the stability of the system and the energy utilization efficiency, which is more suitable for the complex and changeable environment of the laboratory. The system's response capability is further optimized by setting a cumulative judgment strategy for low-temperature effects and statistical analysis of continuous low-temperature events. Only when low-temperature events occur frequently and their impact on the heat transfer plate is not effectively restored, the system will take measures to increase monitoring sensitivity or bypass channel switching. This sophisticated management method ensures efficient operation in complex laboratory environments.

[0028] The embodiments disclosed in the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. The embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part, and / or installed from a removable medium. When the computer program is executed by the central processing unit, the above functions defined in the method of the present application are executed. 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 above two. The computer-readable storage medium can be, for example, but not limited to, a system, device or device of an electrical, magnetic, optical, electromagnetic, infrared segment, or semiconductor, or any combination of the above. More specific examples of computer-readable storage media 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 may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless segments, wire segments, optical cables, RF, etc., or any suitable combination of the above.

[0029] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0030] Those skilled in the art should understand that the above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which 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: The steps 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, thereby realizing heat recovery; A bypass channel is set 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 a temperature sensor to monitor the temperature of the air in the laboratory when it enters the exhaust duct, and use a temperature sensor to monitor the temperature of the fresh air from the outside when it enters the air inlet duct. 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. If 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 inlet duct, the heat transfer is maintained; if the temperature of the air when it enters the exhaust duct is lower than the temperature of the air when it enters the inlet duct, the valve is used to control fresh air 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: A plurality of levels of temperature difference are set, namely, the first temperature difference level, the second temperature difference level and the third temperature difference level, and the corresponding maximum acceptable buffer time is set from most to least for the plurality of temperature difference levels.

3. The air intake control method of a laboratory ventilation system according to claim 2 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.

4. The air intake control method of a laboratory ventilation system according to claim 3 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, record the time when the air in the exhaust duct remains in a low temperature state, and compare the time when the air in the exhaust duct remains in a low temperature state with the maximum acceptable buffer time set for the corresponding temperature difference level, and make corresponding responses based on the comparison results.

5. The air intake control method of a laboratory ventilation system according to claim 4 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.

6. The air intake control method of a laboratory ventilation system according to claim 5 is characterized in that: 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 when the air temperature value in the exhaust duct recovers to a state not lower than the temperature value in the inlet duct. The timing ends 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 measured with the interval judgment time, and make corresponding response according to the comparison result.

7. The air intake control method of a laboratory ventilation system according to claim 6 is characterized in that: If the total timing duration is greater than the interval judgment duration, no reaction will be taken; if the total timing duration is less than or equal to the interval judgment duration, the low temperature state of the air temperature in the exhaust duct will be marked as a continuous low temperature event, and the low temperature effect cumulative judgment strategy will be executed.

8. The air intake control method of a laboratory ventilation system according to claim 7, characterized in that: The low temperature effect accumulation judgment strategy includes setting a continuous low temperature threshold, counting the number of continuous low temperature events within a preset time, and comparing the number of continuous low temperature events with the continuous low temperature threshold. If the number of continuous low temperature events is less than the continuous low temperature threshold, when the air temperature in the exhaust duct is lower than the fresh air within the preset time, it is considered as a third-level temperature difference. 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. Otherwise, the fresh air is controlled by the valve to enter the laboratory from the bypass channel.

9. 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 8, 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.

10. 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 8.

Images