Limited space carbon dioxide concentration monitoring control system and control method thereof

Abstract

The application relates to the technical field of limited space operation, and discloses a limited space carbon dioxide concentration monitoring control system and a control method thereof. A plurality of ventilation ducts are arranged in the limited space, and a fan is arranged in each ventilation duct, so that external fresh air can continuously enter the limited space, good ventilation is ensured at each position in the limited space, and the problem of excessively high local carbon dioxide concentration in the limited space is prevented. The control module adaptively controls the operating power of the fan according to the carbon dioxide concentration value measured by the first sensor and the temperature value measured by the second sensor, avoids the fan from always operating at the maximum power, reduces the carbon dioxide concentration in the limited space, maximally reduces the energy consumption of the fan, and thus reduces the energy consumption of the carbon dioxide concentration monitoring control system. The operating power of the fan is adjusted according to different temperatures, the temperature in the limited space can be prevented from being too low, and the comfort of personnel in the limited space is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of limited space operation, in particular to a limited space carbon dioxide concentration monitoring control system and a control method thereof. BACKGROUND

[0002] The limited space refers to a space that is closed or partially closed, has a narrow limited import and export, and working personnel cannot work in it for a long time, natural ventilation is poor, and toxic and harmful, flammable and explosive substances are easy to accumulate or the oxygen content is insufficient.

[0003] The limited space includes a car cockpit, an airplane cockpit, a space cabin, an underground tunnel, a basement, a storage room, a garbage station, the inside of a closed maintenance device, a box in an entertainment place, etc. Because the ventilation in the limited space is poor, the working personnel is easy to have a safety accident when working in the limited space for a long time. The main reason for causing human discomfort in the limited space is the environmental air parameters in it, among which, carbon dioxide is an important index affecting the environmental air quality. When the carbon dioxide concentration in the limited space exceeds the threshold value that the human body can bear, the human body feels uncomfortable, and in severe cases, life is endangered.

[0004] In the prior art, the methods capable of removing carbon dioxide in the limited space include a mechanical ventilation method and a physical separation method. The mechanical ventilation method is to use a fan to circulate the air in the limited space with the external air, so as to reduce the carbon dioxide concentration in the limited space. However, when the carbon dioxide concentration in the limited space is high, simply increasing the mechanical ventilation amount cannot effectively reduce the carbon dioxide concentration, and increasing the ventilation amount means that the energy consumption of the fan is increased, and the cost is high. The physical separation method is to use a carbon dioxide separation film material or a molecular sieve to remove carbon dioxide. However, the existing carbon dioxide film needs to be replaced regularly, the cost is high, the molecular sieve system is relatively complex, and the energy consumption is large.

[0005] Therefore, there is an urgent need for a limited space carbon dioxide concentration monitoring control system and a control method thereof to solve the above problems. SUMMARY

[0006] Based on the above problems, the purpose of the present application is to provide a limited space carbon dioxide concentration monitoring control system and a control method thereof, which can effectively control the carbon dioxide concentration in the limited space, ensure the comfort of the environmental air in the limited space, and reduce the energy consumption of the whole system.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] On the one hand, a limited space carbon dioxide concentration monitoring control system is provided, which comprises:

[0009] Ventilation ducts, a plurality of the ventilation ducts are arranged in a limited space, an air inlet of each of the ventilation ducts is communicated with the limited space, and an air outlet of each of the ventilation ducts is communicated with the outside;

[0010] Fans, the fan is arranged in each of the ventilation ducts, and the fan can discharge air in the limited space to the outside through the ventilation duct;

[0011] First sensors, the first sensor is arranged at the air inlet of each of the ventilation ducts in the limited space, and the first sensor is used for measuring the carbon dioxide concentration at the air inlet;

[0012] Second sensors, the second sensor is arranged in the limited space and is used for measuring the temperature in the limited space;

[0013] A control module, the fan, the first sensor and the second sensor are electrically connected with the control module, and the control module can control the fan to operate at different powers according to the carbon dioxide concentration value measured by the first sensor and the temperature information measured by the second sensor.

[0014] As a preferred scheme of the limited space carbon dioxide concentration monitoring control system, the limited space carbon dioxide concentration monitoring control system further comprises an adsorption and desorption device, an adsorption end of the adsorption and desorption device is located in the limited space, and a desorption end of the adsorption and desorption device is located outside the limited space, so as to adsorb and desorb carbon dioxide in the limited space.

[0015] As a preferred scheme of the limited space carbon dioxide concentration monitoring control system, the limited space carbon dioxide concentration monitoring control system further comprises a photovoltaic power generation device, the photovoltaic power generation device is electrically connected with the fan and is used for supplying power to the fan.

[0016] As a preferred scheme of the limited space carbon dioxide concentration monitoring control system, the limited space carbon dioxide concentration monitoring control system further comprises an energy storage module electrically connected with the photovoltaic power generation device, and the energy storage module is used for storing the electric energy generated by the photovoltaic power generation device.

[0017] As a preferred scheme of the limited space carbon dioxide concentration monitoring control system, the limited space carbon dioxide concentration monitoring control system further comprises an alarm module corresponding to each of the first sensors, and the alarm module can indicate the carbon dioxide concentration level in the limited space according to the carbon dioxide concentration value measured by the first sensor.

[0018] As a preferred scheme of the limited space carbon dioxide concentration monitoring control system, the alarm module is an audible and visual alarm system, and the audible and visual frequency of the audible and visual alarm system increases with the increase of the carbon dioxide concentration value in the limited space.

[0019] As a preferred scheme of the limited space carbon dioxide concentration monitoring control system, the limited space carbon dioxide concentration monitoring control system further comprises a third sensor for measuring the humidity in the limited space, and the control module can correct the carbon dioxide concentration value measured by the first sensor according to the temperature and humidity measured by the second sensor and the third sensor.

[0020] In another aspect, a control method of a limited space carbon dioxide concentration monitoring control system is provided, which is applied to the limited space carbon dioxide concentration monitoring control system as described above, and comprises the following steps:

[0021] S1, the first sensor acquires the carbon dioxide concentration value Ci at the air inlet in real time, and the second sensor acquires the temperature value Ti in the limited space in real time;

[0022] S2, it is judged whether the carbon dioxide concentration value Ci at the air inlet satisfies Ci≥C0, if yes, it is jumped to S3, if not, it is jumped to S4, wherein C0 is a carbon dioxide concentration threshold value;

[0023] S3, it is judged whether the temperature value Ti in the limited space satisfies T1≤Ti≤T2, if yes, it is jumped to S5, if not, it is judged whether Ti satisfies Ti>T2, if yes, it is jumped to S6, if not, it is jumped to S4;

[0024] S4, the control module controls the fan to operate in a first mode, and the fan operates at the lowest power in the first mode;

[0025] S5, the control module controls the fan to operate in a second mode, and the operating power of the fan increases with the increase of the carbon dioxide concentration value measured by the first sensor in the second mode;

[0026] S6, the control module controls the fan to operate in a third mode, and the fan operates at the maximum power in the third mode.

[0027] As a preferred scheme of the control method of the limited space carbon dioxide concentration monitoring control system, in step S2:

[0028] When the carbon dioxide concentration value Ci measured by any of the first sensors at the air inlets of the plurality of ventilation ducts satisfies Ci≥C0, the control module controls the fan in the corresponding ventilation duct to operate in the second mode;

[0029] When the carbon dioxide concentration value measured by each of the first sensors satisfies Ci < C0, the fan in the corresponding ventilation duct is operated in the first mode.

[0030] As a preferred solution of the control method of the limited space carbon dioxide concentration monitoring control system, the limited space carbon dioxide concentration monitoring control system further comprises an adsorption and desorption device for adsorbing and desorbing carbon dioxide in the limited space, and after step S6, the method further comprises:

[0031] S7, calculating an average value Cia of the carbon dioxide concentration measured by the plurality of first sensors by the control module;

[0032] S8, determining whether Cia satisfies Cia >= C1, if yes, the control module controls the adsorption and desorption device to start, if not, the control module controls the adsorption and desorption device to be closed or remain closed, wherein C1 is a threshold value of the average value of the carbon dioxide concentration.

[0033] The present application has the following advantages:

[0034] The limited space carbon dioxide concentration monitoring control system provided by the present application can realize the communication between the different positions in the limited space and the outside by arranging a plurality of ventilation ducts in the limited space and arranging a fan in each ventilation duct. Under the action of the fan, the air in the limited space is discharged to the outside through the ventilation duct, so that the fresh air from the outside can continuously enter the limited space, thereby realizing the renewal of the air in the limited space. That is, the arrangement of the plurality of ventilation ducts and the plurality of fans can avoid the short circuit of the air circulation in the limited space, ensure that each position in the limited space can be well ventilated, and prevent the problem of poor environmental air quality caused by the excessively high carbon dioxide concentration in the limited space. The operation power of each fan is adaptively controlled according to the carbon dioxide concentration value measured by the first sensor and the temperature value measured by the second sensor, which avoids the constant operation of the fan at the maximum power, reduces the carbon dioxide concentration in the limited space, and maximizes the reduction of the energy consumption of the fan, thereby reducing the energy consumption of the entire carbon dioxide concentration monitoring control system, saving energy and protecting the environment. At the same time, the operation power of each fan is adjusted according to different temperatures, which can prevent the temperature in the limited space from being too low, thereby further improving the comfort of the personnel in the limited space.

[0035] The control method of the limited space carbon dioxide concentration monitoring control system provided by the application can accurately control the operation state of the fan in the multiple ventilation pipes according to the carbon dioxide concentration value measured by the first sensor in real time and the temperature value measured by the second sensor in real time, that is, each fan can be controlled individually, and the corresponding fan is controlled to operate in different modes under different temperature conditions, which can ensure good ventilation in the limited space, reduce the carbon dioxide concentration in the limited space, prevent the temperature in the limited space from being too low, and avoid the fan from always operating at the maximum power, thereby reducing the energy consumption of the entire limited space carbon dioxide concentration monitoring control system. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those skilled in the art without creative labor based on the contents of the embodiments of the present application also belong to the protection scope of the present application.

[0037] Figure 1 is the first flowchart of the control method of the limited space carbon dioxide concentration monitoring control system provided by the embodiment of the present application;

[0038] Figure 2 is the second flowchart of the control method of the limited space carbon dioxide concentration monitoring control system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The embodiment provides a limited space carbon dioxide concentration monitoring control system, comprising a ventilation duct, a fan, a first sensor, a second sensor and a control module.

[0043] Wherein, the ventilation duct is arranged in the limited space, the air inlet of each ventilation duct is communicated with the limited space, and the air outlet of each ventilation duct is communicated with the outside. The fan is arranged in each ventilation duct, and the fan can exhaust the air in the limited space to the outside through the ventilation duct. The first sensor is arranged at the air inlet of each ventilation duct in the limited space, and the first sensor is used for measuring the carbon dioxide concentration at the air inlet. That is, the number of ventilation ducts is equal to the number of fans to ensure smooth ventilation in the ventilation duct, the number of first sensors is equal to the number of ventilation ducts to ensure that there is a first sensor near the air inlet of each ventilation duct in the limited space to measure the carbon dioxide concentration, so as to accurately control the operation mode of each fan. The second sensor is arranged in the limited space and is used for measuring the temperature in the limited space. The fan, the first sensor and the second sensor are electrically connected with the control module, and the control module can control the fan to operate at different powers according to the carbon dioxide concentration value measured by the first sensor and the temperature information measured by the second sensor.

[0044] The limited space carbon dioxide concentration monitoring control system provided by the embodiment can realize the air renewal in the limited space. That is, the arrangement of the multiple ventilation ducts and the multiple fans can avoid the short circuit of the air circulation in the limited space, ensure that each position in the limited space can be well ventilated, and prevent the problem of poor environmental air quality caused by the excessively high local carbon dioxide concentration in the limited space. The adaptive control of the operation power of each fan according to the carbon dioxide concentration value measured by the first sensor and the temperature value measured by the second sensor can avoid the constant operation of the fan at the maximum power, reduce the energy consumption of the fan while reducing the carbon dioxide concentration in the limited space, thereby reducing the energy consumption of the entire carbon dioxide concentration monitoring control system, saving energy and protecting the environment. Meanwhile, the adaptive adjustment of the operation power of each fan according to different temperatures can prevent the excessively low temperature in the limited space, thereby further improving the comfort of the personnel in the limited space.

[0045] That is, the limited space carbon dioxide concentration monitoring control system provided by the embodiment can control the fans in the multiple ventilation ducts in the limited space according to the carbon dioxide concentration data measured by the first sensors at multiple different positions, each fan can be independently controlled, the carbon dioxide concentration and the temperature in the limited space can be controlled in the comfortable and safe range, the energy consumption of the entire system can be reduced, the safety of the personnel in the limited space can be ensured, and the comfort can be ensured. The limited space can be an underground bar box, an underground maintenance room, or the like, which has no window or other ventilation opening, and the limited space carbon dioxide concentration monitoring control system of the embodiment can provide protection for the safety and comfort of the personnel in such a limited space.

[0046] Preferably, the first sensor is a carbon dioxide sensor, and the second sensor is a temperature sensor. The specific value of the carbon dioxide concentration threshold can be adaptively selected according to the operation requirements and the tolerance of different personnel to the environmental air.

[0047] Optionally, the limited space carbon dioxide concentration monitoring control system further comprises an adsorption and desorption device, an adsorption end of the adsorption and desorption device is located in the limited space, and a desorption end of the adsorption and desorption device is located outside the limited space, so as to adsorb and desorb the carbon dioxide in the limited space, thereby reducing the carbon dioxide concentration in the limited space. Specifically, when the fan in the ventilation pipeline is in operation, and the carbon dioxide concentration in the limited space measured by the first sensor is still greater than the threshold value, the control module can control the adsorption and desorption device to start to remove the carbon dioxide in the limited space and reduce the carbon dioxide concentration. Exemplarily, the adsorption and desorption device can remove the carbon dioxide by using a chemical adsorption method. The chemical adsorption process is simple, the carbon dioxide adsorption efficiency is high, and the safety performance is good. For example, the adsorbent can be lithium hydroxide, soda lime, or solid amine. The solid amine is a high-molecular polymer with a large number of micropores and a large specific surface area. The process of removing carbon dioxide is reversible, the energy consumption is low, and the solid amine is non-toxic and non-volatile, which will not pollute the air in the limited space.

[0048] Optionally, the limited space carbon dioxide concentration monitoring control system further comprises a photovoltaic power generation device, the photovoltaic power generation device is electrically connected with the fan, and is used to supply power to the fan. The photovoltaic power generation device can be fixed on a structure outside or near the limited space. The photovoltaic power generation device can be used to supply power to the devices requiring power in the entire limited space carbon dioxide concentration monitoring control system, such as the multiple fans in the limited space. Since the photovoltaic power generation device uses sunlight as a resource, it is clean and pollution-free. Therefore, the use of the photovoltaic power generation device can not only meet the power demand of the entire limited space carbon dioxide concentration monitoring control system, but also save energy, further reduce the energy consumption of the entire limited space carbon dioxide concentration monitoring control system, and achieve energy saving and environmental protection. At the same time, the photovoltaic power generation device has a simple structure, is easy to install, has low requirements for the site, and has low investment cost.

[0049] Of course, the photovoltaic power generation device can also be used as a backup power supply. When the power supply outside the limited space fails, the photovoltaic power generation device can meet the power demand of the entire system.

[0050] Optionally, the limited space carbon dioxide concentration monitoring control system further comprises an energy storage module electrically connected with the photovoltaic power generation device, and the energy storage module is used to store the electric energy generated by the photovoltaic power generation device. During the power generation of the photovoltaic power generation device, the energy storage module can store the excess electric energy. When the weather is bad and the electric energy generated by the photovoltaic power generation device is insufficient to meet the power demand, the energy storage module can be used to supply power to the entire limited space carbon dioxide concentration monitoring control system, so as to ensure the continuous and stable supply of system electric energy and ensure the comfortable environment in the limited space.

[0051] Optionally, the limited space carbon dioxide concentration monitoring control system further comprises alarm modules corresponding to the first sensors, respectively. The alarm modules are capable of indicating the carbon dioxide concentration level in the limited space according to the carbon dioxide concentration values measured by the first sensors. If the fan in a certain ventilation duct in the limited space is in a suitable operation mode, but the carbon dioxide concentration measured by the corresponding first sensor at the air inlet of the ventilation duct is still higher than the threshold value, the corresponding alarm module is started and indicates the carbon dioxide concentration level near the current air inlet, so that the staff can timely understand the current air environment quality at the corresponding position in the limited space, and determine whether the limited space is suitable for personnel to enter, thereby avoiding safety accidents. If the carbon dioxide concentration level at the corresponding position in the limited space indicated by the alarm module exceeds the preset dangerous level, the staff needs to take corresponding measures to reduce the carbon dioxide concentration in the limited space.

[0052] That is, the alarm modules play a warning role on the one hand, and facilitate the staff to timely understand the air environment at each position in the limited space. On the other hand, if the carbon dioxide concentration level in the limited space exceeds the dangerous level, the alarm modules can issue an alarm to prompt the staff to take timely measures to prevent safety accidents.

[0053] Preferably, the alarm modules are audible and visual alarm systems, and the audible and visual frequencies of the audible and visual alarm systems increase with the increase of the carbon dioxide concentration values in the limited space. That is, the carbon dioxide concentration level in the limited space can be directly known according to the audible and visual frequencies of the audible and visual alarm systems, which facilitates the staff to determine and take corresponding measures. Exemplarily, the audible and visual alarm systems can be audible and visual alarms.

[0054] Optionally, the limited space carbon dioxide concentration monitoring control system further comprises a third sensor for measuring the humidity in the limited space, and the control module is capable of correcting the carbon dioxide concentration measured by the first sensor according to the temperature and humidity measured by the second sensor and the third sensor. Since the carbon dioxide concentration is easily affected by temperature and humidity, the concentration value is not accurately detected. In this embodiment, the current temperature and humidity are measured in real time by the second sensor and the third sensor, respectively, and the carbon dioxide concentration value measured by the first sensor is corrected by the control module, which can ensure the accuracy of the finally measured carbon dioxide concentration value, thereby accurately controlling the operation mode of the plurality of fans and effectively reducing the energy consumption. Preferably, the third sensor is a humidity sensor.

[0055] The specific process of correcting the carbon dioxide concentration value measured by the first sensor according to the temperature and humidity is prior art, which is not described here.

[0056] As Figure 1As shown, the embodiment also provides a control method of the limited space carbon dioxide concentration monitoring control system, applied to the limited space carbon dioxide concentration monitoring control system as described above, and specifically includes the following steps:

[0057] S1, the first sensor acquires the carbon dioxide concentration value Ci at the air inlet in real time, and the second sensor acquires the temperature value Ti in the limited space in real time;

[0058] S2, it is judged whether the carbon dioxide concentration value Ci at the air inlet satisfies Ci≥C0, if yes, jump to S3, if not, jump to S4, wherein C0 is the carbon dioxide concentration threshold value;

[0059] S3, it is judged whether the temperature value Ti in the limited space satisfies T1≤Ti≤T2, if yes, jump to S5, if not, it is judged whether Ti satisfies Ti>T2, if yes, jump to S6, if not, jump to S4;

[0060] S4, the control module controls the fan to run in the first mode, and the fan runs at the lowest power in the first mode;

[0061] S5, the control module controls the fan to run in the second mode, and the running power of the fan increases with the increase of the carbon dioxide concentration value measured by the first sensor in the second mode;

[0062] S6, the control module controls the fan to run in the third mode, and the fan runs at the maximum power in the third mode.

[0063] Since the limited space is relatively closed, in order to ensure a certain ventilation volume, in the initial state, the fans in the multiple ventilation ducts all run at the lowest power (i.e. the first mode), and when the running mode of the fan is adjusted, the adjustment is all based on the first mode.

[0064] In step S1, the first sensor at the air inlet of each ventilation duct measures the carbon dioxide concentration value at the current air inlet in real time, and transmits the measured carbon dioxide concentration data to the control module, and the control module judges whether to adjust the running power of the fan in the corresponding ventilation duct according to the received carbon dioxide concentration value data.

[0065] In step S2, when the carbon dioxide concentration value Ci measured by any first sensor at the air inlet of the plurality of ventilation ducts is greater than or equal to C0, the control module controls the fan in the corresponding ventilation duct to operate in the second mode. That is, when the carbon dioxide concentration value Ci measured by the first sensor in a certain local area of the limited space is greater than or equal to C0, the fan in the ventilation duct corresponding to the air inlet near the part is preferentially adjusted, and the working power of the fan increases with the increase of the carbon dioxide concentration value Ci (that is, the fan operates in the variable frequency mode). The fans in the remaining ventilation ducts can maintain the original mode of operation, that is, operate at the lowest power in the first mode, thereby minimizing the energy consumption of the entire system. That is, the control module adaptively adjusts the operating power of the fan in the corresponding ventilation duct according to whether the carbon dioxide concentration value Ci measured by the first sensor at the air inlet of each ventilation duct reaches C0. Since the elimination and accumulation of carbon dioxide has nonlinear characteristics (for example, the position where a person is located will produce carbon dioxide due to human respiration, and the carbon dioxide concentration in this position is relatively high, and the number of people in the limited space also affects the carbon dioxide concentration), the above-mentioned way of overall controlling the intermittent operation of multiple fans can effectively reduce energy consumption.

[0066] Exemplarily, C0 can be 1500 ppm, and in other embodiments, the specific value of C0 can be adaptively selected according to the operation requirements in the limited space and the tolerance of different people to the environment air.

[0067] In step S2, if the carbon dioxide concentration value measured by each first sensor satisfies Ci < C0, the fan in the corresponding ventilation duct operates in the first mode. At this time, it indicates that the carbon dioxide concentration value in the limited space is relatively low, and adjusting the fan to operate in the first mode can reduce energy consumption.

[0068] Of course, in other embodiments, step 2 can also include: when the carbon dioxide concentration value Ci measured by a certain first sensor is less than C0, and the temperature value Ti in the limited space is greater than T2, the control module controls the fan in the corresponding ventilation duct to operate in the third mode (the fan operates at maximum power in the third mode), otherwise the control module controls the fan to operate in the first mode (the fan operates at minimum power in the first mode), to prevent the temperature in the limited space from being too high and causing a safety accident, and further improve the comfort and safety in the limited space.

[0069] In step S3, since the operation of the fan can reduce the temperature in the limited space, the operation mode of each fan is controlled according to the temperature in the limited space, on the one hand, the temperature in the limited space can be prevented from being too low, and the comfort of the environment where the personnel is located is improved, on the other hand, the fan power consumption can be reduced while achieving ventilation in the limited space to reduce the carbon dioxide concentration. Exemplarily, in the embodiment, T1 is 18℃, and T2 is 26℃. In other embodiments, the specific values of T1 and T2 can be adaptively selected according to the region or the type of the limited space.

[0070] In step S5, since the temperature in the limited space is relatively high at this time, the fan runs at maximum power to reduce the temperature in the limited space, at the same time, the ventilation volume is increased, the carbon dioxide concentration in the limited space is reduced, and the comfort of the environment where the personnel is located is improved.

[0071] In step S6, since the temperature in the limited space is lower than T1 (18℃) at this time, the fan runs at the lowest power to avoid excessively reducing the environmental temperature in the limited space, and the comfort of the environment where the personnel is located is ensured.

[0072] Referring to Figure 2 When the fan runs in the corresponding mode under the corresponding temperature condition, if the carbon dioxide concentration value Ci measured by the first sensor at the air inlet of the corresponding ventilation pipeline is still greater than or equal to C0, the alarm module is started and indicates the corresponding carbon dioxide concentration level. Specifically, taking the audible and visual alarm system as an example, the audible and visual alarm system indicates different levels of carbon dioxide concentration by different audible and visual frequencies, and the higher the audible and visual frequency, the higher the level of carbon dioxide concentration. Of course, if the carbon dioxide concentration value Ci measured by the first sensor at the air inlet is less than C0 when the fan runs in the corresponding mode under the corresponding temperature condition, the fan in the corresponding ventilation pipeline still maintains the original mode.

[0073] Optionally, the limited space carbon dioxide concentration monitoring control system further comprises an adsorption and desorption device, the adsorption and desorption device is used for adsorbing and desorbing carbon dioxide in the limited space. Referring to Figure 2 After step S6, the following steps are further included:

[0074] S7, calculating the average value Cia of the carbon dioxide concentrations measured by the plurality of first sensors by the control module;

[0075] S8, judging whether Cia satisfies Cia≥C1, if yes, the control module controls the adsorption and desorption device to start, if not, the control module controls the adsorption and desorption device to close or remain closed, wherein C1 is a threshold value of the average value of the carbon dioxide concentration.

[0076] When all the fans are started, if the average value Cia of the carbon dioxide concentrations measured by the plurality of first sensors exceeds the threshold value C1, it indicates that the carbon dioxide concentration in the limited space has exceeded the range that can be tolerated by the indoor personnel, and it is not suitable for personnel to work inside. By starting the adsorption and desorption device, the carbon dioxide in the limited space can be adsorbed and desorbed to remove the carbon dioxide and reduce the carbon dioxide concentration in the limited space, thereby creating a comfortable working environment for the indoor personnel. When the average value Cia of the carbon dioxide concentration is lower than the threshold value C1, the adsorption and desorption device can be controlled to be closed (or maintained to be closed), thereby preventing the increase of the energy consumption of the entire limited space carbon dioxide concentration monitoring and control system.

[0077] Exemplarily, C1 is 4000 ppm, and in other embodiments, the specific value of C1 can be adaptively selected according to the work requirements in the limited space and the tolerance of different personnel to the environment air.

[0078] The control method of the limited space carbon dioxide concentration monitoring and control system provided in the embodiment can accurately control the operation state of the fans in the plurality of ventilation ducts according to the real-time measurement of the carbon dioxide concentration value by the first sensor and the real-time measurement of the temperature value by the second sensor, that is, each fan can be controlled individually. By controlling the corresponding fan to operate in different modes under different temperature conditions, the ventilation in the limited space can be ensured, the carbon dioxide concentration in the limited space can be reduced, the temperature in the limited space can be prevented from being too low, and the energy consumption of the entire limited space carbon dioxide concentration monitoring and control system can be reduced.

[0079] Note that the above are only the preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A control method of a limited space carbon dioxide concentration monitoring control system, characterized by, The limited space carbon dioxide concentration monitoring control system comprises: ventilation pipes, a plurality of the ventilation pipes are arranged in the limited space, an air inlet of each of the ventilation pipes is communicated with the limited space, and an air outlet of each of the ventilation pipes is communicated with the outside; a fan, the fan is arranged in each of the ventilation pipes, and the fan can discharge the air in the limited space to the outside through the ventilation pipe; a first sensor, the first sensor is arranged at the air inlet of each of the ventilation pipes in the limited space, and the first sensor is used for measuring the carbon dioxide concentration at the air inlet; a second sensor, the second sensor is arranged in the limited space and is used for measuring the temperature in the limited space; a control module, the fan, the first sensor and the second sensor are electrically connected with the control module, and the control module can control the fan to operate at different powers according to the carbon dioxide concentration value measured by the first sensor and the temperature information measured by the second sensor; the control method comprises the following steps: S1, the first sensor acquires the carbon dioxide concentration value Ci at the air inlet in real time, and the second sensor acquires the temperature value Ti in the limited space in real time; S2, it is judged whether the carbon dioxide concentration value Ci at the air inlet satisfies Ci≥C0, if yes, the step S3 is jumped to, if not, the step S4 is jumped to, wherein C0 is a carbon dioxide concentration threshold value; S3, it is judged whether the temperature value Ti in the limited space satisfies T1≤Ti≤T2, if yes, the step S5 is jumped to, if not, it is judged whether Ti satisfies Ti>T2, if yes, the step S6 is jumped to, if not, the step S4 is jumped to; S4, the control module controls the fan to operate in a first mode, and the fan operates at the lowest power in the first mode; S5, the control module controls the fan to operate in a second mode, and the operating power of the fan increases with the increase of the carbon dioxide concentration value measured by the first sensor in the second mode; S6, the control module controls the fan to operate in a third mode, and the fan operates at the maximum power in the third mode; in the step S2: when the carbon dioxide concentration value Ci measured by any of the first sensors at the air inlets of the plurality of ventilation pipes satisfies Ci≥C0, the control module controls the fan in the corresponding ventilation pipe to operate in the second mode; when the carbon dioxide concentration values measured by each of the first sensors all satisfy Ci 2. The control method of the limited space carbon dioxide concentration monitoring control system according to claim 1, characterized by, The limited space carbon dioxide concentration monitoring control system further comprises an adsorption and desorption device, an adsorption end of the adsorption and desorption device is located in the limited space, a desorption end of the adsorption and desorption device is located outside the limited space, and the adsorption and desorption device is used for adsorbing and desorbing the carbon dioxide in the limited space.

3. The control method of the limited space carbon dioxide concentration monitoring control system according to claim 1, wherein The limited space carbon dioxide concentration monitoring control system further comprises a photovoltaic power generation device, the photovoltaic power generation device is electrically connected with the fan and is used for supplying power for the fan.

4. The control method of the limited space carbon dioxide concentration monitoring control system according to claim 3, characterized by, The limited space carbon dioxide concentration monitoring control system further comprises an energy storage module electrically connected with the photovoltaic power generation device, and the energy storage module is used for storing the electric energy generated by the photovoltaic power generation device.

5. The control method of the limited space carbon dioxide concentration monitoring control system according to claim 1, wherein The limited space carbon dioxide concentration monitoring control system further comprises an alarm module corresponding to each of the first sensors, and the alarm module can indicate the carbon dioxide concentration level in the limited space according to the carbon dioxide concentration value measured by the first sensor.

6. The control method of the limited space carbon dioxide concentration monitoring control system according to claim 5, wherein The alarm module is an audible and visual alarm system, and the audible and visual frequency of the audible and visual alarm system increases with the increase of the carbon dioxide concentration value in the limited space.

7. The control method of the limited space carbon dioxide concentration monitoring control system according to any one of claims 1 to 6, characterized by, The limited space carbon dioxide concentration monitoring control system further comprises a third sensor for measuring the humidity in the limited space, and the control module can correct the carbon dioxide concentration measured by the first sensor according to the temperature and humidity measured by the second sensor and the third sensor.

8. The control method of the limited space carbon dioxide concentration monitoring control system according to claim 1, further comprising an adsorption and desorption device for adsorbing and desorbing carbon dioxide in the limited space, characterized by, After step S6, the following steps are further included: S7, calculating the average value Cia of the carbon dioxide concentration measured by the first sensors by the control module; S8, judging whether Cia satisfies Cia≥C1, if yes, the control module controls the adsorption and desorption device to start, if not, the control module controls the adsorption and desorption device to close or keep closing, wherein C1 is the threshold value of the average value of the carbon dioxide concentration.

Images