CN114234331B - Ventilation system and linkage control method thereof - Google Patents
Ventilation system and linkage control method thereof Download PDFInfo
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- CN114234331B CN114234331B CN202010939254.5A CN202010939254A CN114234331B CN 114234331 B CN114234331 B CN 114234331B CN 202010939254 A CN202010939254 A CN 202010939254A CN 114234331 B CN114234331 B CN 114234331B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
- F24F2110/70—Carbon dioxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Fluid Mechanics (AREA)
- Human Computer Interaction (AREA)
- Ventilation (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A ventilation system and a coordinated control method thereof can automatically and efficiently realize the adjustment of the indoor carbon dioxide concentration by controlling a ventilation device in a coordinated manner according to the detection value of a carbon dioxide sensor. The ventilation system comprises a ventilation device, a plurality of carbon dioxide sensors and a control device, wherein the ventilation device is provided with at least two operation modes with different air volume levels, the plurality of carbon dioxide sensors are arranged at different positions in a target space regulated by the ventilation device so as to acquire detection values of carbon dioxide concentration at different positions, the control device is communicated with the ventilation device and the plurality of carbon dioxide sensors and is used for determining a mode conversion threshold value according to the change trend of the carbon dioxide concentration, and the control device acquires a mode conversion reference value according to the detection values of the current plurality of carbon dioxide sensors, the mode conversion threshold value and preset calculation logic and controls the operation mode of the ventilation device according to the mode conversion reference value.
Description
Technical Field
The invention relates to a ventilation system and a linkage control method thereof.
Background
Along with the improvement of living standard, the requirements of people on own office living environment are also higher.
For example, in addition to the environment in which the air is kept at an appropriate temperature and humidity, there are cases where the air in which the air is kept is desired to have a high quality, and various air treatment systems have been developed which have sensors for detecting specific components (for example, carbon dioxide and the like) in the air and operate based on the detection results of the sensors.
In practice, air handling systems sometimes require air handling of large spaces. In this case, it is contemplated that the sensor may be provided at a plurality of locations in a large space to better control the operation of the air treatment system. However, in this case, it is necessary to consider how to link the entire system to efficiently perform air treatment.
Disclosure of Invention
The present invention has been made in view of the above-described problems, and an object thereof is to provide a ventilation system and a control method thereof, which can automatically and efficiently adjust the concentration of carbon dioxide in a room by controlling a ventilation device in a coordinated manner according to a detection value of a carbon dioxide sensor.
In order to achieve the above object, the present invention provides a ventilation system comprising: the air exchange device is provided with at least two operation modes with different air volume levels, the plurality of carbon dioxide sensors are arranged at different positions in a target space regulated by the air exchange device so as to acquire detection values of carbon dioxide concentration at different positions, the control device is communicated with the air exchange device and the plurality of carbon dioxide sensors and is used for determining a mode conversion threshold value according to the change trend of the carbon dioxide concentration, and the control device acquires a mode conversion reference value according to the current detection values of the plurality of carbon dioxide sensors, the mode conversion threshold value and preset calculation logic and controls the operation mode of the air exchange device according to the mode conversion reference value.
Here, the "operation mode with different air volume levels" may be an operation mode with different air volume ranges of the ventilator (for example, an operation mode with a large air volume range and an operation mode with a medium air volume range), or an operation mode with different operation continuity of the ventilator (for example, an operation mode in which the ventilator is continuously operated and an operation mode in which the ventilator is intermittently operated).
According to the ventilation system of the invention, the plurality of carbon dioxide sensors are arranged to carry out multi-point detection, so that the condition that the operation of the ventilation device can not be effectively controlled to reduce the carbon dioxide concentration due to uneven carbon dioxide concentration distribution can be avoided especially in the case of large space for arranging the carbon dioxide sensors; the control device determines a mode conversion reference value according to the detection values of the plurality of carbon dioxide sensors, and controls the operation mode of the air interchanger according to the mode conversion reference value, namely, the detection values of the plurality of carbon dioxide sensors are judged firstly, then the detection values of the proper carbon dioxide sensors are selected as reference data of the whole system linkage according to the requirement, so that the air interchanger operates in the proper mode, and the indoor carbon dioxide concentration adjustment can be effectively realized; the control device determines the mode switching threshold value according to the change trend of the carbon dioxide concentration, and obtains the mode switching reference value according to the detection values of the carbon dioxide sensors, the mode switching threshold value and preset calculation logic, so that the condition that the operation mode of the air interchanger is frequently switched because the carbon dioxide concentration near the specific carbon dioxide sensor is near the mode switching threshold value can be reduced.
In the ventilation system according to the present invention, it is preferable that the trend of change in the carbon dioxide concentration includes a trend of increase in the carbon dioxide concentration and a trend of decrease in the carbon dioxide concentration, and the mode switching threshold value in the trend of increase in the carbon dioxide concentration is larger than the mode switching threshold value in the trend of decrease in the carbon dioxide concentration for the operation modes adjacent to each other in the air volume level.
For example, for the operation mode of the large air volume range and the operation mode of the medium air volume range, the mode switching threshold value when the operation mode of the medium air volume range is switched to the operation mode of the large air volume range is larger than the mode switching threshold value when the operation mode of the large air volume range is switched to the operation mode of the medium air volume range.
According to the ventilation system of the present invention, since the mode switching threshold value in the case of the upward trend of the carbon dioxide concentration is larger than the mode switching threshold value in the case of the downward trend of the carbon dioxide concentration for the operation modes adjacent to the air volume level, it is possible to avoid frequent switching of the operation modes of the ventilation device due to the carbon dioxide concentration in the vicinity of the specific carbon dioxide sensor being in the vicinity of the mode switching threshold value.
In the ventilation system according to the present invention, it is preferable that the trend of the carbon dioxide concentration is determined based on two detection values, a front detection value and a rear detection value, which are detected by the same carbon dioxide sensor at predetermined time intervals.
Furthermore, in the ventilation system of the present invention, preferably, the preset calculation logic is: comparing the detection value of each carbon dioxide sensor with the mode conversion threshold value, acquiring a plurality of processing values according to the preset corresponding relation between the comparison result and the processing values, comparing the processing values, and selecting the processing value with the highest priority as the mode conversion reference value.
Here, as the "processing value", for example, "low", "medium", "high" and the like can be used.
According to the ventilation system of the present invention, the preset calculation logic is: the method comprises the steps of comparing the detection value of each carbon dioxide sensor with a mode conversion threshold value, obtaining a plurality of treatment values according to the preset corresponding relation between the comparison result and the treatment value, comparing the treatment values, and selecting the treatment value with the highest priority as a mode conversion reference value, namely, dividing the control device into a plurality of fixed treatment values according to the detection value of a single carbon dioxide sensor and the mode conversion threshold value, and comparing the treatment values, so that the comparison between the carbon dioxide sensors is easier, and the ventilation quantity of the ventilation device needed for inhibiting the concentration of carbon dioxide is easier and more accurate.
Furthermore, in the ventilation system of the present invention, preferably, the preset calculation logic is: comparing the detection values of the carbon dioxide sensors, selecting the largest detection value as the processing value with the highest priority, comparing the processing value with the mode conversion threshold value, and acquiring the mode conversion reference value according to the preset corresponding relation between the comparison result and the mode conversion reference value.
According to the ventilation system of the present invention, the preset calculation logic is: the method comprises the steps of comparing detection values of a plurality of carbon dioxide sensors, selecting the largest detection value as a processing value with the highest priority, comparing the processing value with a mode conversion threshold value, and acquiring the mode conversion reference value according to the preset corresponding relation between the comparison result and the mode conversion reference value, so that the ventilation quantity of the ventilation device required for inhibiting the concentration of carbon dioxide is easily ensured, the ventilation device operates in the most suitable mode, the concentration of carbon dioxide is reduced more quickly, the processing value with the highest priority when the largest detection value is used as the processing value with the highest priority is conveniently determined, and the control logic of the ventilation system is simplified.
In the ventilation system according to the present invention, it is preferable that the higher the priority of the processing value having the highest priority is, the higher the air volume level of the operation mode determined from the mode conversion reference value is.
In the ventilation system according to the present invention, it is preferable that the control device immediately increases the air volume of the ventilation device when the air volume level of the operation mode determined based on the mode conversion reference value increases.
According to the ventilation system of the present invention, when the air volume level of the operation mode determined based on the mode conversion reference value increases, the control device immediately increases the air volume of the ventilation device, and thus helps to quickly reduce the carbon dioxide concentration, and prevents the carbon dioxide concentration from being kept too high for a long time, thereby affecting the health of people.
In the ventilation system according to the present invention, it is preferable that the control means decreases the air volume of the ventilation means after a delay of a predetermined time when the air volume level of the operation mode determined based on the mode conversion reference value decreases.
According to the ventilation system of the present invention, when the air volume level of the operation mode determined based on the mode conversion reference value is reduced, the control device reduces the air volume of the ventilation device after a delay of the preset time, so that the carbon dioxide concentration can be reliably reduced, and the repeated switching of the operation mode of the ventilation device due to the fluctuation of the detection value of the carbon dioxide sensor can be avoided, thereby realizing energy saving.
In addition, the ventilation system according to the present invention preferably further includes a terminal that communicates with the control device and has a function of setting the mode switching threshold value.
In addition, in the ventilation system of the present invention, it is preferable that the terminal issues a notification to the user when the detection value is greater than the early warning value.
In addition, the ventilation system according to the present invention preferably further includes a terminal that communicates with the control device and has a function of prohibiting or allowing the ventilation device to stop, and when the ventilation device is prohibited from stopping by the terminal, the control device causes the ventilation device to continue to operate even if the mode switching reference value satisfies a condition for stopping the ventilation device.
In order to achieve the above object, the present invention provides a coordinated control method of a ventilation system, wherein the ventilation system is controlled by first acquiring a detection value of carbon dioxide concentration by a plurality of carbon dioxide sensors; secondly, determining a mode conversion threshold according to the change trend of the detection value; thirdly, acquiring a mode conversion reference value according to the detection values of the plurality of carbon dioxide sensors, the mode conversion threshold value and preset calculation logic; and finally, controlling the operation mode of the air interchanger according to the mode conversion reference value.
(effects of the invention)
According to the invention, the plurality of carbon dioxide sensors are arranged to carry out multipoint detection, so that the phenomenon that the operation of the air interchanger cannot be effectively controlled to reduce the carbon dioxide concentration due to uneven carbon dioxide concentration distribution caused by the flowing condition of personnel can be avoided especially when the space for arranging the carbon dioxide sensors is large and especially different functional areas (such as a conference area, an office area and an equipment existence area) exist; the control device determines a mode conversion reference value according to the detection values of the plurality of carbon dioxide sensors, and controls the operation of the air interchanger according to the mode conversion reference value, namely, the detection values of the plurality of carbon dioxide sensors are judged firstly, then the detection values of the proper carbon dioxide sensors are selected as reference data of the whole system linkage according to the requirement, so that the air interchanger operates in a proper mode, and the indoor carbon dioxide concentration adjustment can be effectively realized; the control device determines the mode switching threshold value according to the change trend of the carbon dioxide concentration, and obtains the mode switching reference value according to the detection values of the carbon dioxide sensors, the mode switching threshold value and preset calculation logic, so that the condition that the operation mode of the air interchanger is frequently switched because the carbon dioxide concentration near the specific carbon dioxide sensor is near the mode switching threshold value can be reduced.
Drawings
Fig. 1 is a schematic view showing the overall configuration of a ventilation system according to an embodiment of the present invention.
Fig. 2 is a control logic diagram showing a ventilation system according to an embodiment of the present invention, and shows a classification according to carbon dioxide concentration.
(symbol description)
1. Ventilation system
10. Ventilation device
11. Air inlet
12. Air outlet
13. Air return port
14. Air outlet
20. Carbon dioxide sensor
30. Control device
40. Terminal
PP pipeline
RM room
Detailed Description
Next, a ventilation system according to an embodiment of the present invention will be described with reference to fig. 1 and 2, wherein fig. 1 is a schematic diagram showing the overall configuration of the ventilation system according to an embodiment of the present invention, and fig. 2 is a control logic diagram showing the ventilation system according to an embodiment of the present invention, and shows a classification based on carbon dioxide concentration.
(overall structure of ventilation System)
As shown in fig. 1, the ventilation system 1 includes a ventilation device 10, a carbon dioxide sensor 20, and a control device 30.
Here, the ventilator 10 has at least two operation modes of different air volume levels, and the ventilator 10 is provided with one and is connected to one room RM (large space) which is a target space regulated by the ventilator 10 via a duct PP so as to ventilate the room RM. The carbon dioxide sensor 20 is provided in plural (two in the illustrated example, but not limited thereto) at different positions in the room RM to detect the carbon dioxide concentration at different positions in the room RM. The control device 30 can perform wired or wireless communication with the ventilation device 10 and the carbon dioxide sensor 20 to control the operation mode of the ventilation device 10 based on the detection value of the carbon dioxide sensor 30. The ventilation system 1 further includes a terminal 40, and the terminal 40 can communicate with the control device 30 to control the operation of the ventilation device 10 via the control device 30. The room RM may be, for example, a conference room, and the number of people in the room is not fixed, and depending on the use of the conference room, the number of people may increase at a certain time. At this time, if the detected value of the carbon dioxide sensor 20 satisfies a specific condition, the ventilation system 1 of the present invention automatically activates the ventilation device 10, and reduces the carbon dioxide concentration by rapid ventilation, thereby ensuring that the carbon dioxide concentration in the space is within a concentration range that is comfortable and safe for the human body. Further, by activating the ventilator 10, the problem of the uneven carbon dioxide concentration in the room RM, which is a large space, can be solved. In practical situations, a plurality of functional areas (such as conference areas and office areas) are usually divided into a large space to meet different requirements, if the carbon dioxide sensors 20 are respectively disposed in the functional areas, when the number of people in each area is different to cause different carbon dioxide concentrations, the system is utilized to detect all the carbon dioxide sensors in all the areas, and when the detection value of the carbon dioxide sensor 20 meets a specific condition, the ventilation device 10 is automatically started to realize ventilation of all the areas in the large space.
(Structure of ventilator)
The ventilator 10 has, for example, an air intake 11, an air outlet 12, an air return 13, and an air outlet 14, wherein the air intake 11 communicates with the air outlet 12 via a first air flow path in the ventilator 10, the air return 13 communicates with the air outlet 14 via a second air flow path in the ventilator 10, and air outside (outdoor) the room RM flows from the air intake 11 to the air outlet 12 via the first air flow path to enter the room RM, and on the other hand, air inside the room RM flows from the air return 13 to the air outlet 14 via the second air flow path to be discharged outside the room RM.
Here, the ventilator 10 is constituted by a total heat exchanger and has both a ventilation function and a heat exchange function (for example, in winter, the cold air flowing through the first air flow passage is heat-exchanged with the warm air flowing through the second air flow passage to heat the cold air flowing through the first air flow passage), but the ventilator 10 may have only the ventilation function (for example, the ventilator 10 may be constituted by a device having no heat exchange function such as an air cleaner).
In addition, since the specific structure of the total heat exchanger, the air cleaner, etc. is not an important point of the present invention, and an existing structure may be adopted, it is not developed in detail.
(Structure of carbon dioxide sensor)
The carbon dioxide sensor 20 detects the concentration of carbon dioxide in the room RM, and transmits the detected value directly or indirectly (for example, via the ventilator 10) to the control device 30.
Here, since the specific structure of the carbon dioxide sensor 20 is not an important point of the present invention and an existing structure may be adopted, it will not be developed in detail.
(Structure of control device)
The control device 30 performs a series of logical operations on the data transmitted from the carbon dioxide sensor 20, for example, and transmits a command to the ventilation device 10 by wired communication or wireless communication based on the calculation result, and the control device 30 recognizes the command transmitted from the terminal 40, for example, and transmits the command to the ventilation device 10 by wired communication or wireless communication, thereby controlling the operation of the ventilation device 10.
Here, since the specific structure of the control device 30 is not an important point of the present invention, it will not be developed in detail.
(terminal)
The terminal 40 is constituted by a smart phone, a tablet computer, a cloud server, and the like, for example.
Here, the terminal 40 is a mobile phone, and the terminal 40 has a function of setting a mode switching threshold to be described below for determining whether or not the operation mode of the ventilator 10 is switched, a function of setting whether or not the ventilator 10 is allowed to stop during the interlock control, and a function of displaying the concentration of carbon dioxide (a mode switching reference value to be described below), for example. In addition, in the coordinated control process, when the ventilation device 10 switches the operation mode and the detection value of the carbon dioxide sensor 20 is greater than the early warning value, a relevant notification may be sent to the user through the terminal application program (APP).
In addition, since the specific structure of the terminal 40 is not an important point of the present invention and an existing structure may be adopted, it will not be developed in detail.
(operation of ventilation System)
In the ventilation system 1, the control device 30 determines a mode switching threshold value according to the trend of the carbon dioxide concentration, and then obtains a mode switching reference value according to the detection values of the plurality of carbon dioxide sensors 20, the mode switching threshold value and preset calculation logic to control the operation mode of the ventilation device 10 according to the mode switching reference value.
Here, the trend of change in the carbon dioxide concentration includes a trend of increase in the carbon dioxide concentration and a trend of decrease in the carbon dioxide concentration, and the mode switching threshold value at the time of the trend of increase in the carbon dioxide concentration is larger than the mode switching threshold value at the time of the trend of decrease in the carbon dioxide concentration for the operation modes adjacent to the air volume level of the ventilator 10. And, the preset calculation logic is: the detection values of the carbon dioxide sensors 20 are compared with the mode conversion threshold value, a plurality of processing values are obtained according to the preset corresponding relation between the comparison result and the processing values, the processing values are compared, and the processing value with the highest priority is selected as the mode conversion reference value.
An example of the coordinated control method of the ventilation system 1 will be described with reference to fig. 2.
Here, the mode switching threshold value at the time of the carbon dioxide concentration rising trend includes a first threshold value (800 ppm in the illustrated example, but not limited thereto) and a second threshold value (1000 ppm in the illustrated example, but not limited thereto) larger than the first threshold value, the mode switching threshold value at the time of the carbon dioxide concentration falling trend includes a third threshold value (900 ppm in the illustrated example, but not limited thereto) larger than the first threshold value and smaller than the second threshold value and a fourth threshold value (600 ppm in the illustrated example, but not limited thereto) smaller than the first threshold value, and the processing value includes "low", "medium", and "high" (but not limited thereto).
First, control device 30 determines the trend of the carbon dioxide concentration detected by each carbon dioxide sensor 20 (which can be determined from two detection values before and after the same carbon dioxide sensor 20 is detected at a predetermined time interval, and if the latter detection value is the same as the former detection value, the current processing value is kept the same as the previous time). For example, if the trend of change in the carbon dioxide concentration is a trend of increase in the carbon dioxide concentration, control device 30 determines that the mode switching threshold value is the first threshold value and the second threshold value. On the other hand, if the trend of change in the carbon dioxide concentration is a trend of decrease in the carbon dioxide concentration, control device 30 determines that the mode switching threshold value is the third threshold value and the fourth threshold value.
Next, control device 30 compares the detection value of each carbon dioxide sensor 20 with the mode conversion threshold value, and obtains a plurality of processing values according to the preset correspondence between the comparison result and the processing values. For example, when the trend of the carbon dioxide concentration is a trend of the carbon dioxide concentration, if the detected value of a certain carbon dioxide sensor 20 is equal to or higher than the first threshold value, the process value corresponding to the carbon dioxide sensor 20 is "medium"; if the detection value of a certain carbon dioxide sensor 20 is equal to or greater than the second threshold value, the processing value corresponding to that carbon dioxide sensor 20 is "high". On the other hand, when the trend of the carbon dioxide concentration is a trend of the carbon dioxide concentration decrease, if the detected value of a certain carbon dioxide sensor 20 is equal to or smaller than the third threshold value, the process value corresponding to the carbon dioxide sensor 20 is "medium"; if the detection value of a certain carbon dioxide sensor 20 is equal to or less than the fourth threshold value, the processing value corresponding to the carbon dioxide sensor 20 is "low". Here, the priority of the processing value of "low" is smaller than the priority of the processing value of "medium" which is smaller than the priority of the processing value of "high".
Then, control device 30 compares the plurality of process values corresponding to the plurality of carbon dioxide sensors 20, and selects the process value with the highest priority as the mode conversion reference value. For example, if the process value corresponding to one carbon dioxide sensor 20 is "middle" and the process value corresponding to the other carbon dioxide sensor 20 is "high", then "high" is selected as the mode conversion reference value; if the process value corresponding to one carbon dioxide sensor 20 is "middle", and the process value corresponding to the other carbon dioxide sensor 20 is "low", selecting "middle" as the mode conversion reference value; if the process values corresponding to the plurality of carbon dioxide sensors 20 are all "low", then "low" is selected as the mode conversion reference value. Here, the mode switching reference value of "low" corresponds to the stop mode of the ventilator 10, the mode switching reference value of "medium" corresponds to the standard mode in which the ventilator 10 operates at the first air volume, and the mode switching reference value of "high" corresponds to the storm mode in which the ventilator 10 operates at the second air volume larger than the first air volume.
Then, the control device 30 controls the operation mode of the air exchanging device 10 according to the mode conversion reference value. For example, if "low" is selected as the mode switching reference value, the control device 30 stops the ventilator 10; if "medium" is selected as the mode conversion reference value, the control device 30 causes the ventilator 10 to operate at the first air volume (standard mode); if "high" is selected as the mode switching reference value, control device 30 causes ventilator 10 to operate at the second air volume larger than the first air volume (storm mode).
In addition, in the ventilation system 1, when the air volume level of the operation mode determined based on the mode conversion reference value increases, the control device 30 immediately increases the air volume of the ventilation device 10. For example, when the air volume level of the operation mode determined according to the mode switching reference value is changed from zero (i.e., the ventilator 10 is stopped) to the first air volume, the control device 30 immediately starts the ventilator 10 and operates at the first air volume; when the air volume level of the operation mode determined from the mode conversion reference value is changed from the first air volume to the second air volume, the control device 30 causes the ventilator 10 to switch from the first air volume to the second air volume to operate.
In addition, in the ventilation system 1, when the air volume level of the operation mode determined based on the mode conversion reference value is reduced, the control device 30 causes the air volume of the ventilation device 10 to be reduced after a delay by a preset time (for example, 30 minutes, but not limited thereto, and the preset time may be a fixed value or may be set to a different value according to a level change). For example, when the air volume level of the operation mode determined from the mode conversion reference value is changed from the second air volume to the first air volume, the control device 30 delays the preset time and then causes the ventilator 10 to switch from the second air volume to the first air volume for operation; when the air volume level of the operation mode determined from the mode switching reference value is changed from the first air volume to zero, the control device 30 delays the preset time and stops the operation of the ventilator 10.
In the ventilation system 1, when stopping the ventilation device 10 by the terminal 40 is prohibited, the control device 30 continues the operation of the ventilation device 10 even if the mode switching reference value satisfies the condition for stopping the ventilation device 10. For example, in the case where the stop of the ventilator 10 is prohibited by the terminal 40, the controller 10 causes the ventilator to operate at the first air volume even if the air volume level of the operation mode determined from the mode transition reference value is changed from the first air volume to zero and the preset time elapses.
(main effects of the present embodiment)
According to the ventilation system 1 of the present embodiment, since the plurality of carbon dioxide sensors 20 are provided to enable multi-point detection, it is possible to prevent the operation of the ventilator from being effectively controlled to reduce the carbon dioxide concentration due to uneven carbon dioxide concentration distribution, particularly when the room RM in which the carbon dioxide sensors are provided is large; the control device 30 determines a mode conversion reference value from the detection values of the plurality of carbon dioxide sensors 20, and controls the operation of the ventilator 10 based on the mode conversion reference value, that is, the detection values of the plurality of carbon dioxide sensors 20 are first determined, and then, a proper detection value of the carbon dioxide sensor 20 is selected as reference data for the whole system linkage according to the need, so that the ventilator 10 is operated in a proper gear or mode, and thus, the adjustment of the carbon dioxide concentration in the room RM can be efficiently realized; further, since the control device 30 determines the mode switching threshold value based on the trend of the change in the carbon dioxide concentration and acquires the mode switching reference value based on the detection values of the plurality of carbon dioxide sensors 20, the mode switching threshold value, and the preset calculation logic, it is possible to reduce the case where the operation mode of the ventilator 10 is frequently switched because the carbon dioxide concentration in the vicinity of the specific carbon dioxide sensor 20 is in the vicinity of the mode switching threshold value.
Further, according to the ventilation system 1 of the present embodiment, since the mode switching threshold value in the upward trend is larger than the mode switching threshold value in the downward trend for the operation modes in which the air volume levels of the ventilation device 10 are adjacent, it is possible to avoid a situation in which the operation mode of the ventilation device 10 is frequently switched because the carbon dioxide concentration in the vicinity of the specific carbon dioxide sensor 20 is in the vicinity of the mode switching threshold value.
Further, according to the ventilation system 1 of the present embodiment, the preset calculation logic is: the detection value of each carbon dioxide sensor 20 is compared with the mode conversion threshold value, a plurality of processing values are obtained according to the preset corresponding relation between the comparison result and the processing value, then the processing values are compared, the processing value with the highest priority is selected as the mode conversion reference value, that is, the control device 10 firstly divides the processing values according to the detection value of the single carbon dioxide sensor 20 and the mode conversion threshold value to obtain a plurality of fixed processing values, and then compares the processing values, so that the comparison between the carbon dioxide sensors 10 is easier, and further the ventilation amount of the ventilation device 10 required for inhibiting the concentration of carbon dioxide is easier and more accurate.
Further, according to the ventilation system 1 of the present embodiment, the control device 3 selects the mode conversion reference value corresponding to the highest priority carbon dioxide sensor 10 to control the ventilation device 10 in a coordinated manner, and therefore, it is possible to avoid the user from being in an environment where the carbon dioxide concentration is high for a long time, starting from the user's demand for healthy air.
Further, according to ventilation system 1 of the present embodiment, when the air volume level of the operation mode determined based on the mode conversion reference value increases, control device 30 immediately increases the air volume of ventilation device 10, and thus contributes to a rapid reduction in the carbon dioxide concentration, and prevents the carbon dioxide concentration from remaining too high for a long period of time, thereby affecting the health of the user.
Further, according to the ventilation system 1 of the present embodiment, when the air volume level of the operation mode determined based on the mode conversion reference value is reduced, the control device 30 reduces the air volume of the ventilation device 10 after a delay of the preset time, and therefore, it is possible to ensure a reliable reduction in the carbon dioxide concentration, and to avoid repeated switching of the operation mode of the ventilation device 10 due to fluctuation of the detection value of the carbon dioxide sensor 20, thereby achieving energy saving.
The invention has been described above by way of example with reference to the accompanying drawings, it being apparent that the invention is not limited to the embodiments described above.
For example, in the above embodiment, the ventilator 10 is provided in one room RM, and the carbon dioxide sensor 20 is provided in plural at different positions in the room RM, but not limited thereto, the ventilator 10 may be provided in plural (in this case, plural ventilators 10 may be set to operate synchronously), the room RM may be provided in plural, the ventilators 10 may be provided in each room, and simultaneous on and off may be achieved, and the carbon dioxide sensor 20 may be provided in one or plural in each room RM, in which case, the carbon dioxide concentration in each room RM is adjusted by controlling the on of the ventilators 10 in all rooms simultaneously.
In the above embodiment, the first threshold value, the second threshold value, the third threshold value, and the fourth threshold value may be set to satisfy a predetermined relationship, and for example, the difference between the second threshold value and the third threshold value may be set to a fixed value, for example, 100ppm. At this time, after the second threshold value is set to 1000ppm by the terminal 40, the third threshold value becomes 900ppm accordingly.
Further, in the above embodiment, the first threshold value, the second threshold value, the third threshold value, and the fourth threshold value may also be set to be fixed.
In addition, in the above embodiment, the preset calculation logic is: the detection value of each carbon dioxide sensor 20 is compared with the mode conversion threshold value, a plurality of processing values are obtained according to the preset corresponding relation between the comparison result and the processing value, then the processing values are compared, and the processing value with the highest priority is selected as the mode conversion reference value, but the method is not limited thereto, and the following preset calculation logic can be adopted: the detection values of the plurality of carbon dioxide sensors 20 are compared, the largest detection value is selected as the processing value with the highest priority, the processing value is compared with the mode conversion threshold value, and the mode conversion reference value is obtained according to the preset corresponding relation between the comparison result and the mode conversion reference value.
In the above embodiment, the operation mode of the ventilator 10 includes three stages of zero (stop), the first air volume, and the second air volume, but the operation mode of the ventilator 10 is not limited thereto, and may include any two stages of the three stages, and may include four or more stages.
In the above embodiment, the control device 30 is independent of the ventilator 10, but the present invention is not limited thereto, and the control device 30 may be integrated with the ventilator 10, for example.
It is to be understood that the present invention can freely combine the respective portions in the embodiment, or appropriately modify and omit the respective portions in the embodiment within the scope thereof.
Claims (19)
1. A ventilation system, comprising: a ventilation device, a plurality of carbon dioxide sensors, and a control device, characterized in that,
the air interchanger has at least two operation modes with different air volume levels,
the plurality of carbon dioxide sensors are arranged at different positions in the object space regulated by the ventilation device to acquire detection values of carbon dioxide concentration at different positions,
the control device is communicated with the ventilation device and the plurality of carbon dioxide sensors and is used for determining a mode conversion threshold value according to the change trend of the carbon dioxide concentration, the control device obtains a mode conversion reference value according to the current detection values of the plurality of carbon dioxide sensors, the mode conversion threshold value and preset calculation logic and controls the operation mode of the ventilation device according to the mode conversion reference value,
the preset calculation logic is as follows: comparing the detection value of each carbon dioxide sensor with the mode conversion threshold value, acquiring a plurality of processing values according to the preset corresponding relation between the comparison result and the processing values, comparing the processing values, and selecting the processing value with the highest priority as the mode conversion reference value.
2. The ventilation system of claim 1, wherein the air flow is controlled by the control unit,
the trend of the carbon dioxide concentration includes a trend of increasing the carbon dioxide concentration and a trend of decreasing the carbon dioxide concentration,
for the operation modes with adjacent air volume levels, the mode switching threshold value at the time of the upward trend of the carbon dioxide concentration is larger than the mode switching threshold value at the time of the downward trend of the carbon dioxide concentration.
3. The ventilation system of claim 1, wherein the air flow is controlled by the control unit,
the change trend of the carbon dioxide concentration is determined according to a front detection value and a rear detection value which are detected by the same carbon dioxide sensor at preset time intervals.
4. The ventilation system of claim 1, wherein the air flow is controlled by the control unit,
the higher the priority of the processing value having the highest priority, the higher the air volume level of the operation mode determined from the mode conversion reference value.
5. The ventilation system of claim 1, wherein the air flow is controlled by the control unit,
when the air volume level of the operation mode determined from the mode conversion reference value increases, the control device causes the air volume of the ventilator to immediately increase.
6. The ventilation system of claim 1, wherein the air flow is controlled by the control unit,
when the air volume level of the operation mode determined according to the mode conversion reference value is reduced, the control device causes the air volume of the ventilation device to be reduced after a delay of a preset time.
7. The ventilation system of claim 1, wherein the air flow is controlled by the control unit,
also included is a terminal that is configured to receive a signal,
the terminal communicates with the control device and has a function of setting the mode switching threshold.
8. The ventilation system of claim 7, wherein the air flow is controlled by the control unit,
and when the detection value is larger than the early warning value, the terminal sends a notification to a user.
9. The ventilation system of claim 1, wherein the air flow is controlled by the control unit,
also included is a terminal that is configured to receive a signal,
the terminal communicates with the control device and has a function of prohibiting or allowing the ventilation device to stop,
when stopping the ventilator by the terminal, the control device causes the ventilator to continue to operate even if the mode switching reference value satisfies a condition for stopping the ventilator.
10. A ventilation system, comprising: a ventilation device, a plurality of carbon dioxide sensors, and a control device, characterized in that,
the air interchanger has at least two operation modes with different air volume levels,
the plurality of carbon dioxide sensors are arranged at different positions in the object space regulated by the ventilation device to acquire detection values of carbon dioxide concentration at different positions,
the control device is communicated with the ventilation device and the plurality of carbon dioxide sensors and is used for determining a mode conversion threshold value according to the change trend of the carbon dioxide concentration, the control device obtains a mode conversion reference value according to the current detection values of the plurality of carbon dioxide sensors, the mode conversion threshold value and preset calculation logic and controls the operation mode of the ventilation device according to the mode conversion reference value,
the preset calculation logic is as follows: comparing the detection values of the carbon dioxide sensors, selecting the largest detection value as the processing value with the highest priority, comparing the processing value with the mode conversion threshold value, and acquiring the mode conversion reference value according to the preset corresponding relation between the comparison result and the mode conversion reference value.
11. The ventilation system of claim 10, wherein the air flow is controlled by the control unit,
the trend of the carbon dioxide concentration includes a trend of increasing the carbon dioxide concentration and a trend of decreasing the carbon dioxide concentration,
for the operation modes with adjacent air volume levels, the mode switching threshold value at the time of the upward trend of the carbon dioxide concentration is larger than the mode switching threshold value at the time of the downward trend of the carbon dioxide concentration.
12. The ventilation system of claim 10, wherein the air flow is controlled by the control unit,
the change trend of the carbon dioxide concentration is determined according to a front detection value and a rear detection value which are detected by the same carbon dioxide sensor at preset time intervals.
13. The ventilation system of claim 10, wherein the air flow is controlled by the control unit,
the higher the priority of the processing value having the highest priority, the higher the air volume level of the operation mode determined from the mode conversion reference value.
14. The ventilation system of claim 10, wherein the air flow is controlled by the control unit,
when the air volume level of the operation mode determined from the mode conversion reference value increases, the control device causes the air volume of the ventilator to immediately increase.
15. The ventilation system of claim 10, wherein the air flow is controlled by the control unit,
when the air volume level of the operation mode determined according to the mode conversion reference value is reduced, the control device causes the air volume of the ventilation device to be reduced after a delay of a preset time.
16. The ventilation system of claim 10, wherein the air flow is controlled by the control unit,
also included is a terminal that is configured to receive a signal,
the terminal communicates with the control device and has a function of setting the mode switching threshold.
17. The ventilation system of claim 16, wherein the air flow is controlled by the control unit,
and when the detection value is larger than the early warning value, the terminal sends a notification to a user.
18. The ventilation system of claim 10, wherein the air flow is controlled by the control unit,
also included is a terminal that is configured to receive a signal,
the terminal communicates with the control device and has a function of prohibiting or allowing the ventilation device to stop,
when stopping the ventilator by the terminal, the control device causes the ventilator to continue to operate even if the mode switching reference value satisfies a condition for stopping the ventilator.
19. A coordinated control method of a ventilation system according to any one of claim 1 to 18, characterized in that,
firstly, acquiring detection values of carbon dioxide concentration by using a plurality of carbon dioxide sensors;
secondly, determining a mode conversion threshold according to the change trend of the detection value;
thirdly, acquiring a mode conversion reference value according to the detection values of the plurality of carbon dioxide sensors, the mode conversion threshold value and preset calculation logic;
and finally, controlling the operation mode of the air interchanger according to the mode conversion reference value.
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