CN113465073A - Control method of ventilation system and ventilation system - Google Patents

Control method of ventilation system and ventilation system Download PDF

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Publication number
CN113465073A
CN113465073A CN202110684541.0A CN202110684541A CN113465073A CN 113465073 A CN113465073 A CN 113465073A CN 202110684541 A CN202110684541 A CN 202110684541A CN 113465073 A CN113465073 A CN 113465073A
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China
Prior art keywords
air
speed
room
exhaust
air supply
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CN202110684541.0A
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Chinese (zh)
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CN113465073B (en
Inventor
胡博
陶慧汇
杨云龙
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202110684541.0A priority Critical patent/CN113465073B/en
Publication of CN113465073A publication Critical patent/CN113465073A/en
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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
    • F24F7/007—Ventilation with forced flow
    • 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
    • F24F11/0001—Control or safety arrangements for ventilation
    • 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
    • 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
    • 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
    • F24F11/77—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 by controlling the speed of ventilators
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F24F2110/40—Pressure, e.g. wind pressure
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fluid Mechanics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)
  • Ventilation (AREA)

Abstract

The invention relates to a control method of a ventilation system and the ventilation system using the control method. The control method comprises the following steps: determining a target value of the air exhaust speed of each room based on the volume of each room, the set air exchange times and the area of an air exhaust outlet of an air exhaust pipeline; determining a target value of the air supply speed of each room based on the target value of the air exhaust speed; detecting the air exhaust speed and the air supply speed of each room; respectively comparing the measured air exhaust speed and air supply speed with the corresponding target values of the air exhaust speed and the air supply speed; and based on the comparison result, controlling the rotating speeds of the exhaust fan and the air supply fan, and controlling the opening degrees of the exhaust air valve and the air supply air valve corresponding to each room, so that the exhaust air speed is greater than or equal to the exhaust air speed target value, and the air supply speed is greater than or equal to the air supply speed target value, wherein the exhaust air speed is greater than the air supply speed. The control method of the ventilation system can be controlled based on the set ventilation times and the set pressure difference, and has high control precision.

Description

Control method of ventilation system and ventilation system
Technical Field
The invention relates to the technical field of ventilation, in particular to a control method of a ventilation system and the ventilation system.
Background
Ventilation is a control technique for ventilating air in a room or other conditioned area by means of ventilation dilution or ventilation removal. For ventilation purposes, ventilation systems are often used for control. Ventilation systems can be classified into three types, a fresh air system, an air return system, and a recirculation system. The fresh air system conveys outdoor fresh air to the room (namely 'full fresh air') so as to meet the requirement of indoor fresh air ventilation; the return air system mixes part of fresh air and indoor air (or called return air) and delivers the mixture to the indoor after treatment; the recirculation system (or called as a closed system) totally adopts return air (namely 'without fresh air') to supply air indoors.
The application fields of the ventilation system are very wide, such as underground spaces, industrial buildings, clean technology, safe ventilation, agricultural fields, and the like. In the field of cleaning technology, ventilation systems usually adopt fresh air systems to air condition areas such as wards, operating rooms, pharmaceutical workshops and medical laboratories to meet the requirements of cleanliness and temperature and humidity. The ventilation system can also control the pressure difference in the regulated area to meet the requirements of different application scenes. When the risk of pathogenic microorganisms such as pathogenic bacteria and viruses and the like spreading exists in the regulated area, the ventilation system can realize negative pressure control, the air pressure in the regulated area is processed to be lower than the external air pressure so as to limit polluted air in the regulated area without leakage, and the polluted air is timely discharged to a fixed place through a special channel to be specially processed so as to prevent the pathogenic microorganisms such as pathogenic bacteria and viruses and the like from spreading to pollute the external environment. In addition, through ventilation and reasonable airflow organization, the concentration of pathogenic microorganisms in the regulated area can be diluted, and medical staff can be in a favorable wind direction section, so that the safety of the medical staff is protected. Therefore, a stable, reliable ventilation system is critical to the safety of the negative pressure ward.
A control system for a negative pressure ward has been developed in the prior art. For example, chinese patent application CN112113303A discloses a negative pressure ward control system and method. The negative pressure ward control system comprises an exhaust unit, an air supply unit and a controller. The air supply unit is communicated with an air supply outlet at the top of the negative pressure ward through an air supply pipe, so that air supply is realized; the exhaust unit is communicated with an exhaust outlet at the bottom of the side wall of the negative pressure ward through an exhaust pipe, so that exhaust is realized; the negative pressure ward is provided with a differential pressure sensor, and the air supply pipe and the exhaust pipe are respectively provided with a regulating valve. The controller receives the pressure signal of the negative pressure ward detected by the pressure difference sensor and controls the operation of the regulating valve, the exhaust unit and the air supply unit so as to control the pressure difference of the ward. However, the control method of the negative pressure ward is only based on the pressure difference, and the control method is single. Under the condition of meeting the pressure difference, if the wind speeds of the exhaust fan set and the air supply unit are too high, the ventilation volume is too large, discomfort of personnel in a ward is caused, and larger noise is generated, so that unnecessary energy consumption is caused; if the wind speeds of the exhaust unit and the air supply unit are too low, the air exchange times are too few, and the air quality in the negative pressure ward cannot be guaranteed. Therefore, there is a possibility of improvement in the accuracy of the differential pressure control in the negative pressure ward.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the technical problem in the prior art that the control precision of the pressure difference of the negative pressure ward is not sufficient, the invention provides a control method of a ventilation system. The ventilation system includes an exhaust fan configured to communicate with at least one room to be conditioned through an exhaust duct having an exhaust air valve and a supply fan configured to communicate with the at least one room through a supply duct having a supply air valve, and the control method includes:
determining a target value of the air exhaust speed of each room based on the volume of each room, the set air exchange times and the area of an air exhaust outlet of the air exhaust pipeline;
determining a target value of the air supply speed of each room based on the target value of the air exhaust speed;
detecting the air exhaust speed and the air supply speed of each room;
respectively comparing the measured air exhaust speed and the measured air supply speed with the corresponding target values of the air exhaust speed and the air supply speed;
controlling the rotation speeds of the exhaust fan and the supply fan based on the comparison result, and controlling the opening degrees of the exhaust air valve and the supply air valve corresponding to each room so that the exhaust air speed is equal to or higher than the exhaust air speed target value and the supply air speed is equal to or higher than the supply air speed target value,
wherein the air exhaust speed is greater than the air supply speed.
As can be understood by those skilled in the art, in the technical solution of the control method of a ventilating system of the present invention, the target value of the exhaust air speed of each room is first determined based on the volume of each room, the set number of times of ventilation, and the area of the exhaust port of the exhaust duct. The number of air changes is the ratio of the amount of ventilation per unit time to the volume of the room. When the room is in a negative pressure state, the exhaust air volume is larger than the air supply volume, so the ventilation frequency is equal to the exhaust air volume divided by the volume of the room in unit time. After the volume of the room, the number of times of ventilation and the area of the air outlet of the air exhaust pipeline are determined, the target value of the air exhaust speed corresponding to each room can be determined through calculation. Next, based on the determined target value of the wind speed of the discharged wind, a target value of the wind speed of the supplied wind for each room is determined. Then, the exhaust air speed and the supply air speed of each room are detected. And comparing the measured air exhaust speed and air supply speed with the corresponding target values of the air exhaust speed and the air supply speed. Based on the comparison result, the rotation speeds of the exhaust fan and the air supply fan are controlled, and the opening degrees of the exhaust air valve and the air supply air valve corresponding to each room are controlled, so that the exhaust air speed is greater than or equal to the exhaust air speed target value, the air supply speed is greater than the air supply speed target value, and the exhaust air speed is greater than the air supply speed. The air exhaust speed is greater than the air supply speed, so that the room can be ensured to be in a negative pressure state. The air exhaust speed can meet the requirement of the corresponding air exhaust speed target value by adjusting the rotating speed of the air exhaust fan and the opening degree of the air exhaust valve corresponding to each room, the actual air exchange times are ensured to reach the requirement of the set air exchange times, and the control method of the ventilation system disclosed by the invention is more in line with the actual requirement. In addition, the target value of the air exhaust speed is determined firstly, and then the target value of the air supply speed is associated with the target value of the air exhaust speed, so that on one hand, the air supply speed can be quickly and preliminarily adjusted, the pressure difference of each room can reach or approach the preset pressure difference target value, and the control efficiency is improved; on the other hand, the problems of energy consumption increase, noise increase and the like caused by overlarge residual air volume can be effectively avoided, and the control precision is improved.
In a preferred embodiment of the above method for controlling a ventilation system, the target value of the discharged air speed is equal to the volume of the room multiplied by the set ventilation times and divided by the area of the air outlet.
In a preferred technical solution of the above-mentioned control method of the ventilation system, the target value of the supply air speed is equal to the target value of the exhaust air speed multiplied by a preset coefficient, wherein the preset coefficient is greater than or equal to 0.8 and less than 1. Through the arrangement, a proper target value of the air supply speed can be conveniently obtained, and the control efficiency is further improved. In addition, the preset coefficient is set to be more than or equal to 0.8 and less than 1, and the target value of the air supply speed can be ensured to be less than the target value of the air exhaust speed, so that the adjusted room is ensured to be in a negative pressure state.
In a preferred embodiment of the control method of a ventilation system described above, the at least one room includes a plurality of rooms, each of the rooms is provided with the corresponding discharge air valve and supply air valve, and the control method further includes:
detecting a pressure difference of each room when the exhaust air speed is greater than or equal to the exhaust air speed target value and when the supply air speed is greater than or equal to the supply air speed target value;
comparing the measured differential pressure with a set differential pressure;
and controlling the rotating speed of the air supply fan and/or the opening degree of the corresponding air supply air valve based on the comparison result of the pressure difference and the set pressure difference. When the air exhaust speed is greater than or equal to the target air exhaust speed, the air exhaust speed can meet the requirement of the set air exchange times. Further, when the supply air speed is greater than or equal to the supply air speed target value, it is indicated that the preliminary adjustment of the differential pressure is also completed at this time. Then, the pressure difference of each room is detected, the detected pressure difference is compared with a set pressure difference, and then the pressure difference is accurately controlled based on the comparison result of the pressure difference and the set pressure difference, so that the rotating speed of the air supply fan and/or the opening degree of the corresponding air supply air valve are further controlled.
In a preferred embodiment of the control method of the ventilation system, when the differential pressure is greater than or equal to a difference between the set differential pressure and a first pressure correction value and is smaller than a sum of the set differential pressure and a second pressure correction value, the blower fan is controlled to maintain a current rotation speed, and the corresponding blower air valve is controlled to maintain a current opening. When the differential pressure is larger than or equal to the difference value between the set differential pressure and the first pressure correction value and smaller than the sum value between the set differential pressure and the second pressure correction value, the differential pressure of the room is moderate at the moment, and the current rotating speed of the air supply fan and the corresponding opening degree of the air supply air valve are kept.
In a preferred technical solution of the control method of the ventilation system, when the pressure difference is smaller than the difference value, it is determined whether the opening degree of the corresponding air supply damper is the maximum opening degree;
when the opening degree of the air supply air valve is the maximum opening degree, controlling the rotating speed of the air supply fan to increase a first air speed and keeping a first preset time period;
re-detecting the pressure difference of the room;
comparing the current differential pressure to the difference value;
when the current differential pressure is smaller than the difference value, the step of repeatedly controlling the rotating speed of the air supply fan to increase a first air speed and keeping the rotating speed for a first preset time period;
and when the current differential pressure is larger than or equal to the difference value, controlling the air supply fan to keep the current rotating speed. When the differential pressure is smaller than the difference between the set differential pressure and the first pressure correction value, it means that the air supply volume of the room is small at this time, and the air supply volume needs to be increased. First, whether the opening of the corresponding blast damper is the maximum opening is judged. When the opening of the air supply air valve is the maximum opening, the rotation speed of the air supply fan is controlled to be increased if the air supply quantity can not be increased by controlling the opening of the air supply air valve.
In a preferred technical solution of the control method of the ventilation system, when the opening degree of the air supply air valve is smaller than the maximum opening degree, the opening degree of the corresponding air supply air valve is controlled to increase by a first preset opening degree and keep for a second preset time period;
re-detecting the pressure difference of the room;
comparing the current differential pressure to the difference value;
when the current differential pressure is smaller than the difference value, the step of repeatedly controlling the opening degree of the corresponding air supply air valve to increase by a first preset opening degree and keeping for a second preset time period;
and when the current differential pressure is larger than or equal to the difference value, controlling the air supply air valve to keep the current opening. When the opening degree of the corresponding air supply air valve is smaller than the maximum opening degree, the air supply quantity can be increased by increasing the opening degree of the air supply air valve without directly increasing the air speed of the air supply fan, so that the air supply efficiency of the air supply fan is improved, and the control precision is improved.
In a preferred embodiment of the above method for controlling a ventilation system, when the differential pressure is equal to or greater than the sum, the opening degree of each of the supply air valves is obtained;
comparing the opening degree of each air supply air valve with the maximum opening degree;
when the opening degree of each air supply air valve is smaller than the maximum opening degree, controlling the rotating speed of the air supply fan to reduce a second air speed and keeping a third preset time period;
repeatedly detecting a pressure difference of the room;
when the current pressure difference is larger than or equal to the sum, the step of repeatedly controlling the rotating speed of the air supply fan to reduce the second air speed and keeping the rotating speed for a third preset time period;
and when the current differential pressure is smaller than the sum, controlling the air supply fan to keep the current rotating speed. When the differential pressure is greater than the sum of the set differential pressure and the second pressure correction value, the air supply volume in the room is large, and the air supply volume needs to be reduced. Firstly, judging whether the air supply air valve corresponding to each room is in the maximum opening degree, and when the opening degree of each air supply air valve is smaller than the maximum opening degree, indicating that the rotating speed of the air supply fan is larger at the moment, so that the corresponding air supply speed is adjusted by reducing the rotating speed of the air supply fan. Therefore, not only can the precision control of the pressure difference be realized, but also the energy consumption of the air supply fan and the noise can be correspondingly reduced.
In a preferred embodiment of the above method for controlling a ventilation system, when the opening degree of at least one of the supply air valves is a maximum opening degree, the opening degree of the supply air valve corresponding to the room is controlled to be decreased by a second predetermined opening degree and maintained for a fourth preset time period, wherein the differential pressure corresponding to the room is greater than or equal to the sum;
repeatedly detecting a pressure difference of the room;
when the current differential pressure is larger than or equal to the sum value, the step of repeatedly controlling the opening degree of the air supply air valve corresponding to the room to reduce a second preset opening degree and keeping the opening degree for a fourth preset time period;
and when the current differential pressure is smaller than the sum value, controlling the air supply air valve corresponding to the room to keep the current opening. When the opening of at least one air supply air valve is the maximum opening, the air speed of the air supply fan is moderate at the moment, and the air supply quantity is reduced by reducing the opening of the air supply air valve of the corresponding room.
In order to solve the above problems in the prior art, that is, to solve the technical problem in the prior art that the pressure difference control precision of the negative pressure ward is not sufficient, the invention further provides a ventilation system. The ventilation system includes:
an exhaust fan configured to communicate with at least one room being conditioned through an exhaust duct having an exhaust air valve;
an air supply fan configured to communicate with the at least one room through an air supply duct having an air supply air valve; and is
The ventilation system uses a control method according to any one of the above. By using any one of the above control methods of the ventilation system, the ventilation system of the invention can simultaneously meet the requirements of set ventilation times and set pressure difference, and the air conditioning of the negative pressure ward is more in line with the actual requirements. In addition, the ventilation system can carry out preliminary adjustment and precision adjustment on the pressure difference, improves the control precision, and can effectively avoid the problems of energy consumption increase, noise increase and the like caused by overlarge residual air volume.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a system schematic of an embodiment of a ventilation system of the present invention;
FIG. 2 is a flow chart of a method of controlling a ventilation system of the present invention;
figure 3 is a flow chart of a first embodiment of a method of controlling a ventilation system of the present invention;
figure 4 is a first partial flow chart of a second embodiment of a control method of a ventilating system according to the present invention;
fig. 5 is a second partial flowchart of the control method of the ventilating system in accordance with the second embodiment of the present invention.
List of reference numerals:
1. a ventilation system; 10. an air supply fan; 11. a supply air line; 11a, a first air supply pipeline; 11b, a second air supply pipeline; 11c, a third air supply pipeline; 12a, a first air supply air valve; 12b, a second air supply air valve; 12c, a third air supply air valve; 13a, a first air supply air speed sensor; 13b, a second air supply air speed sensor; 13c, a third air supply air speed sensor; 20. an exhaust fan; 21. an exhaust duct; 21a, a first exhaust pipeline; 21b, a second exhaust pipeline; 21c, a third exhaust pipeline; 22a, a first exhaust air valve; 22b, a second exhaust air valve; 22c, a third exhaust air valve; 23a, a first exhaust wind speed sensor; 23b, a second exhaust air speed sensor; 23c, a third exhaust air speed sensor; 30a, a first differential pressure sensor; 30b, a second differential pressure sensor; 30c, a third differential pressure sensor; 40. a controller; 41. a communication line; 2A, a first room; 2B, a second room; 2C, third room.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first" and "second" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to solve the technical problem of insufficient pressure difference control precision of a negative pressure ward in the prior art, the invention provides a control method of a ventilation system and the ventilation system 1 using the control method. The ventilation system 1 includes an exhaust fan 20 and a supply fan 10, the exhaust fan 20 is configured to communicate with at least one room to be conditioned through an exhaust duct 21 having an exhaust air valve, the supply fan 10 is configured to communicate with at least one room through a supply duct 11 having a supply air valve, and the control method includes:
determining a target value of the air exhaust speed of each room based on the volume of each room, the set air exchange times and the area of an air exhaust port of an air exhaust pipeline (step S1);
determining a target value of the blowing wind speed for each room based on the target value of the blowing wind speed (step S2);
detecting the exhaust air speed and the supply air speed of each room (step S3);
comparing the measured exhaust air speed and the air supply speed with the corresponding exhaust air speed target value and air supply speed target value respectively (step S4);
based on the comparison result, the rotation speeds of the exhaust fan and the supply fan are controlled, and the opening degrees of the exhaust air valve and the supply air valve corresponding to each room are controlled so that the exhaust air speed is equal to or higher than the exhaust air speed target value and the supply air speed is equal to or higher than the supply air speed target value, wherein the exhaust air speed is higher than the supply air speed (step S5).
Figure 1 is a system schematic of an embodiment of a ventilation system of the present invention. As shown in fig. 1, in one or more embodiments, the ventilation system 1 includes a controller 40, a supply blower 10, a supply duct 11, an exhaust blower 20, and an exhaust duct 21. In one or more embodiments, the controller 40 is a PLC controller such that various signals may be conveniently acquired by the controller 40 and corresponding components may be controlled based on PID calculations. The blower fan 10 is a variable frequency fan and is configured to be electrically connected to the controller 40 via a communication line 41, so that the on/off and the rotation speed of the blower fan 10 can be controlled by the controller 40. The supply fan 10 may be a centrifugal fan, an axial fan, or other suitable fan. The air supply fan 10 is communicated with the room to be conditioned through an air supply pipeline 11. As shown in FIG. 1, in one or more embodiments, the conditioned room includes 3 rooms, a first room 2A, a second room 2B, and a third room 2C, respectively. Each conditioned room may be the same (i.e., have the same area and the same height) or may be different. Alternatively, the number of conditioned rooms may be set to other suitable numbers more or less than 3. As shown in fig. 1, the air supply fan 10 communicates with the first room 2A, the second room 2B, and the third room 2C through a first air supply duct 11a, a second air supply duct 11B, and a third air supply duct 11C connected in parallel with each other, respectively, so as to supply fresh air sucked when the air supply fan 10 is operated into each room. The first air supply pipeline 11a, the second air supply pipeline 11b and the third air supply pipeline 11c are aluminum foil extrusion molding composite air pipes, double-sided glass fiber load air pipes or made of other suitable materials. The first air supply pipeline 11a, the second air supply pipeline 11b and the third air supply pipeline 11c can adopt the same pipe diameter, and different pipe diameters can be selected according to actual needs.
As shown in fig. 1, in one or more embodiments, a first air supply valve 12A with an adjustable opening degree is provided on the first air supply duct 11a to control the amount of air supplied into the first room 2A. The opening range is 0-100%, wherein 0 is totally closed, and 100% is totally open. The first supply air valve 12a is configured to be electrically connected to the controller 40 via a communication line 41, so that the opening degree of the first supply air valve 12a is adjusted by the controller 40. A first supply air speed sensor 13a is provided on the first supply air duct 11a and positioned downstream of the first supply air valve 12A so as to detect the speed of supply air delivered into the first room 2A. First supply air speed sensor 13a is also configured to be electrically connected to controller 40 via communication line 41 so that controller 40 may conveniently acquire a wind speed signal from first supply air speed sensor 13 a. Accordingly, a second air supply valve 12B with an adjustable opening is provided in the second air supply duct 11B to control the amount of air supplied into the second room 2B. A second blowing air speed sensor 13B is provided on the second blowing duct 11B and downstream of the second blowing air valve 12B so as to detect the blowing air speed delivered into the second room 2B. The second blast air valve 12b and the second blast air speed sensor 13b are also configured to be electrically connected to the controller 40 via a communication line 41. Further, a third air supply valve 12C whose opening degree is adjustable is also provided in the third air supply duct 11C so as to control the amount of air supplied into the third room 2C. A third air supply speed sensor 13C is provided on the third air supply duct 11C downstream of the third air supply valve 12C so as to detect the speed of air supplied into the third room 2C. The third blast air valve 12c and the third blast air speed sensor 13c are also configured to be electrically connected to the controller 40 via a communication line 41. In one or more embodiments, a primary, intermediate, and high-efficiency filtering device (not shown) is further disposed in the air supply duct 11 to effectively filter the fresh air fed into the air supply duct 11.
As shown in fig. 1, the exhaust fan 20 is a variable frequency fan and is configured to be electrically connected to the controller 40 through a communication line 41 so that the on/off and the rotation speed of the exhaust fan 20 can be controlled by the controller 40. The exhaust fan 20 may be a centrifugal fan, an axial fan, or other suitable fan. The exhaust fan 20 is configured to communicate with the conditioned room through an exhaust duct 21. As shown in fig. 1, the exhaust fan 20 is communicated with the first room 2A, the second room 2B, and the third room 2C through a first exhaust duct 21a, a second exhaust duct 21B, and a third exhaust duct 21C connected in parallel to each other, respectively, so that the exhaust fan 20 sucks out indoor air when operating. The first exhaust pipeline 21a, the second exhaust pipeline 21b and the third exhaust pipeline 21c are aluminum foil extrusion molding composite air pipes, double-sided glass fiber load air pipes or made of other suitable materials. The first exhaust pipeline 21a, the second exhaust pipeline 21b and the third exhaust pipeline 21c can adopt the same pipe diameter, and different pipe diameters can be selected according to actual needs.
As shown in fig. 1, in one or more embodiments, a first exhaust air valve 22A with an adjustable opening degree is provided on the first exhaust air pipe 21a to control the amount of exhaust air in the first room 2A. A first discharge wind speed sensor 23a is provided on the first discharge duct 21a and positioned upstream of the first discharge wind valve 22A so as to detect the discharge wind speed of the first room 2A. The first exhaust air valve 22a and the first exhaust air speed sensor 23a are configured to be electrically connected to the controller 40 through a communication line 41. Accordingly, a second exhaust air valve 22B with an adjustable opening is also provided on the second exhaust duct 21B to control the amount of exhaust air from the second room 2B. A second discharge air speed sensor 23B is provided on the second discharge duct 21B and upstream of the second discharge air valve 22B so as to detect the discharge air speed of the second room 2B. The second exhaust air valve 22b and the second exhaust air speed sensor 23b are also configured to be electrically connected to the controller 40 through the communication line 41. Further, a third discharge air valve 22C whose opening degree is adjustable is also provided in the third discharge duct 21C so as to control the discharge air volume in the third room 2C. A third discharge air velocity sensor 23C is provided on the third discharge duct 21C and upstream of the third discharge air valve 22C so as to detect the discharge air velocity of the third room 2C. The third exhaust air valve 22c and the third exhaust air speed sensor 23c are also configured to be electrically connected to the controller 40 through the communication line 41. In one or more embodiments, a primary, intermediate, and high efficiency filter (not shown) is disposed in the exhaust duct 21 to effectively filter the air drawn out of the room.
As shown in fig. 1, in one or more embodiments, a first differential pressure sensor 30a is also provided in the first room 2A to detect a differential pressure in the first room 2A. The first differential pressure sensor 30a is configured to be electrically connected to the controller 40 via a communication line 41 so that the controller 40 can conveniently receive a differential pressure signal from the first differential pressure sensor 30 a. Accordingly, a second differential pressure sensor 30B is also provided in the second room 2B to detect a differential pressure in the second room 2B. The second differential pressure sensor 30b is configured to form an electrical connection with the controller 40 via a communication line 41. A third differential pressure sensor 30C is also provided in the third room 2C to detect a differential pressure in the third room 2C. The third differential pressure sensor 30c is configured to be electrically connected to the controller 40 via a communication line 41.
The method for controlling the ventilating system of the present invention will be described in detail based on the ventilating system 1 described above. It is to be noted that the control method of the ventilation system of the invention can also be applied to other suitable ventilation systems.
Fig. 2 is a flow chart of a control method of a ventilation system of the present invention. As shown in fig. 2, the control method of the ventilation system 1 is started, and then, first, the control method performs step S1, in which a target value of the discharge wind speed for each room is determined based on the volume of each room, the set number of times of ventilation, and the discharge outlet area of the discharge duct 21. In one or more embodiments, the set number of air changes per room is 18 per hour. Alternatively, the set number of air changes per room may be set to other suitable numbers more or less than 18 times/h. It is understood that the set number of air changes for each room may be the same or different according to actual needs. The air discharge opening area of the air discharge duct 21 is the cross-sectional area of the corresponding air discharge duct 21 arranged in each room at the air discharge opening. The target value of the air exhaust speed of each room is equal to the volume of the room multiplied by the set air exchange times divided by the area of the air exhaust outlet of the corresponding air exhaust pipeline 21. Next, step S2 is executed to determine a target value of the blowing air speed for each room based on the target value of the blowing air speed. In one or more embodiments, the supply air speed target value for each room is equal to the corresponding discharge air speed target value multiplied by a preset coefficient. Wherein the preset coefficient is greater than or equal to 0.8 and less than 1. By setting a proper preset coefficient, a proper target value of the air supply speed can be conveniently obtained, and the control efficiency is improved. In addition, the target value of the air supply speed is set to be smaller than the target value of the air exhaust speed, so that the adjusted room can be ensured to be in a negative pressure state. Then, the exhaust air speed and the supply air speed of each room are detected (step S3). The discharge wind speed of each room is detected by a wind speed sensor disposed in the corresponding discharge duct 21. Accordingly, the wind speed of the blast air of each room is detected by a wind speed sensor disposed in the corresponding blast duct 11. The control method proceeds to step S4 where the measured exhaust air speed and supply air speed are compared with the corresponding exhaust air speed target value and supply air speed target value. Based on the comparison result, the rotation speeds of the exhaust fan 20 and the supply fan 10 are controlled, and the opening degrees of the exhaust air valve and the supply air valve of each room are controlled so that the exhaust air speed is equal to or higher than the exhaust air speed target value and the supply air speed is equal to or higher than the supply air speed target value, wherein the exhaust air speed is higher than the supply air speed (step S5).
Fig. 3 is a flowchart of a first embodiment of a control method of a ventilation system of the present invention. As shown in fig. 3, the control method of the ventilation system 1 is started, and then, first, the control method performs step S1 of determining a target value of the discharge wind speed for each room based on the volume of each room, the set number of times of ventilation, and the discharge opening area of the discharge duct 21. Next, step S2 is executed to determine a target value of the blowing air speed for each room based on the target value of the blowing air speed. Then, all the discharge air valves and the supply air valves are controlled to be opened to the maximum opening degree (step S20). The control method advances to step S21 to control the exhaust fan 20 to start. And after a fifth preset time period, controlling the air supply fan 10 to start. In one or more embodiments, the fifth preset time period is 20s (seconds). Alternatively, the fifth preset time period may be set to other suitable times longer or shorter than 20 s. By controlling the starting of the exhaust fan 20 and then the starting of the air supply fan 10, the room can be ensured to be in a negative pressure state, and the diffusion of pathogenic microorganisms is prevented from polluting the external environment.
As shown in fig. 3, when the blower fan 10 is turned on, step S31 is executed to detect the discharge air speed in each room. Then, it is determined whether or not the discharge wind speed in each room is equal to or higher than the corresponding discharge wind speed target value (step S41). If the judgment result is yes, the exhaust air speed of each room at the moment meets the requirement of the corresponding exhaust air speed target value. Accordingly, at this time, the number of air exchange times of each room satisfies the corresponding requirement of the set number of air exchange times, and the exhaust fan 20 is controlled to maintain the current rotation speed (step S51). If the judgment result is no, the exhaust air speed of at least one room does not reach the requirement of the corresponding exhaust air speed target value, step S42 is executed, and whether the exhaust air speed of each room is smaller than the corresponding exhaust air speed target value is judged. If the exhaust air speed of each room is less than the corresponding exhaust air speed target value, which indicates that the rotation speed of the exhaust fan 20 is low and the exhaust air volume cannot meet the requirement yet, the exhaust fan 20 is controlled to increase the third air speed and keep the sixth preset time period (step S52). In one or more embodiments, the third wind speed is 4m/s (meters per second). Alternatively, the third wind speed may also be set to other suitable values, larger or smaller than 4 m/s. Further, the sixth preset time period is 14 s. Alternatively, the sixth preset time period may be set to other suitable times longer or shorter than 14 s. Then, step S31 is repeatedly executed to detect the exhaust air speed of each room, and the current exhaust air speed of each room is compared with the corresponding exhaust air speed target value (step S41) until the exhaust air speed of each room is greater than or equal to the corresponding exhaust air speed target value. After the step S42 is performed, if the discharged wind speed of each room is not less than the corresponding discharged wind speed target value, indicating that the discharged wind speed of at least one room has been equal to or greater than the corresponding discharged wind speed target value, the control method proceeds to a step S53, and decreases the opening of the discharged wind valve of the corresponding room by a third predetermined opening and maintains for a seventh period of time, wherein the discharged wind speed of the corresponding room is greater than the discharged wind speed target value. In one or more embodiments, the third predetermined opening is 4%. Alternatively, the third predetermined opening degree may be arranged to be other suitable opening degrees more or less than 4%. Further, the seventh preset time period is 13 s. Alternatively, the seventh preset time period may be set to other suitable times longer or shorter than 13 s. By reducing the opening of the exhaust air valve of the corresponding room (where the exhaust air speed of the corresponding room is greater than the corresponding exhaust air speed target value), the distribution proportion of the exhaust air volume in each room can be adjusted without increasing the rotation speed of the exhaust air fan 20, so that the exhaust air speed of each room meets the requirement of the corresponding exhaust air speed target value, the exhaust efficiency of the exhaust air fan 20 can be improved, the fan noise can be reduced, and the control precision of the ventilation system 1 can be improved. Then, step S31 is repeatedly executed, and the current exhaust air speed of each room is compared with the corresponding exhaust air speed target value (step S41) until the exhaust air speed of each room is greater than or equal to the corresponding exhaust air speed target value.
As shown in fig. 3, when the supply fan 10 is turned on, the control method further performs step S32 to detect the supply air speed in each room. Then, it is determined whether or not the blowing wind speed in each room is equal to or higher than the corresponding blowing wind speed target value (step S43). If the determination result is yes, which indicates that the supply air speed in each room at this time has satisfied the requirement of the corresponding supply air speed target value, the supply air fan 10 is controlled to maintain the current rotation speed (step S54). If the determination result is no, it indicates that the supply air speed of at least one room has not yet reached the requirement of the corresponding supply air speed target value, step S44 is executed to determine whether the supply air speed of each room is less than the corresponding supply air speed target value. If the air supply speed of each room is less than the corresponding air supply speed target value, which indicates that the rotation speed of the air supply fan 10 is low and the air supply amount cannot meet the requirement yet, the air supply fan 10 is controlled to increase the fourth air speed and keep the fourth air speed for the eighth preset time period (step S55). In one or more embodiments, the fourth wind speed is 3m/s (meters per second). Alternatively, the fourth wind speed may also be set to other suitable values, larger or smaller than 3 m/s. Further, the eighth preset time period is 12 s. Alternatively, the eighth preset time period may be set to other suitable times longer or shorter than 12 s. Then, step S32 is repeated to detect the air supply speed in each room, and the current air supply speed in each room is compared with the corresponding air supply speed target value (step S43) until the air supply speed in each room is greater than or equal to the corresponding air supply speed target value. After step S44 is performed, if the supply air speed for each room is not less than the corresponding supply air speed target value, indicating that the supply air speed for at least one room has been greater than or equal to the corresponding supply air speed target value, the control method proceeds to step S56, and decreases the opening of the supply air valve for the corresponding room by a fourth predetermined opening for a ninth period of time, wherein the supply air speed for the corresponding room is greater than the supply air speed target value. In one or more embodiments, the fourth predetermined opening is 3%. Alternatively, the fourth predetermined opening degree may be arranged to be other suitable opening degrees more or less than 3%. Further, the ninth preset time period is 11 s. Alternatively, the ninth preset time period may be set to other suitable time longer or shorter than 11 s. By reducing the opening of the air supply air valve corresponding to the room (where the air supply speed of the "corresponding room" is greater than the target value of the corresponding air supply speed), the distribution ratio of the air supply volume to each room can be adjusted without increasing the rotation speed of the air supply fan 10, so that the air supply speed of each room meets the requirement of the target value of the corresponding air supply speed, the air supply efficiency of the air supply fan 10 can be improved, the noise of the fan can be reduced, and the control accuracy of the ventilation system 1 can be improved. Then, step S32 is repeated, and the current supply air speed in each room is compared with the corresponding supply air speed target value (step S43) until the supply air speed in each room is equal to or greater than the corresponding supply air speed target value.
Fig. 4 is a first partial flowchart of a second embodiment of a control method of a ventilating system of the present invention. As shown in fig. 4, when the discharge wind speed of each room is equal to or higher than the corresponding discharge wind speed target value and the supply wind speed of each room is equal to or higher than the supply wind speed target value, the pressure difference of each room is detected (step S6). The differential pressure of each room is detected by a differential pressure sensor disposed in the room. Next, the measured differential pressure is compared with the set differential pressure (step S7). In one or more embodiments, the set pressure differential for each room is-15 Pa (Pa). Alternatively, the set pressure difference for each room may be set to be larger or smaller than-15 Pa. It will be understood that the set pressure difference for each room can be set to be the same or different according to actual needs. One of the comparison results obtained from step S7 is that the differential pressure for each room is equal to or greater than the difference between the set differential pressure and the first differential pressure correction value and is less than the sum of the set differential pressure and the second differential pressure correction value. When the differential pressure of each room is greater than or equal to the difference value between the set differential pressure and the first pressure correction value and less than the sum value between the set differential pressure and the second pressure correction value, the supply air fan 10 is controlled to maintain the current rotating speed, and the corresponding supply air valve is controlled to maintain the current opening degree (step S811), and the control method is ended. In one or more embodiments, the first pressure correction value is 3 Pa. Alternatively, the first pressure correction value may be set to other suitable values greater than or less than 3 Pa. Further, the second pressure correction value is 4 Pa. Alternatively, the second pressure correction value may be set to other suitable values greater than or less than 4 Pa. When the differential pressure of each room is between the difference value between the set differential pressure and the first pressure correction value and the sum value between the set differential pressure and the second pressure correction value, which indicates that the differential pressure of each room can meet the requirement through preliminary adjustment, the air supply fan 10 is controlled to maintain the current rotating speed, and the corresponding air supply air valve is controlled to maintain the current opening.
As shown in fig. 4, the second comparison result obtained in step S7 is that the differential pressure in the corresponding room is smaller than the difference between the set differential pressure and the first pressure correction value. This situation indicates that the pressure difference in the room is too small. It should be noted that, since the pressure difference is negative pressure, "too small pressure difference" means that the air exhaust amount of the room is much larger than the air supply amount. Because the air exhaust volume directly influences the air exchange times of the room, the control method of the ventilation system adjusts the pressure difference by controlling the air supply volume under the condition that the air exhaust volume meets the requirement of the air exchange times. Therefore, when the differential pressure of the corresponding room is smaller than the difference between the set differential pressure and the first pressure correction value, the control method proceeds to step S821 to determine whether the opening degree of the corresponding blast damper is the maximum opening degree. If the judgment result is yes, the opening degree of the air supply air valve corresponding to the room is already the maximum opening degree, and the air supply quantity can not be increased by increasing the opening degree of the air supply air valve. Therefore, step S822 is performed to control the rotation speed of the supply fan 10 to increase the first wind speed for the first preset time period. In one or more embodiments, the first wind speed is 6 m/s. Alternatively, the first wind speed may be configured to be larger or smaller than 6 m/s. Further, the first preset time period is 18 s. Alternatively, the first preset time period may be set to other suitable times more or less than 18 s. Next, step S823 is performed to re-detect the pressure difference of the corresponding room. Then, the measured current differential pressure is compared with the difference (i.e., the difference between the set differential pressure and the first pressure correction value) (step S824). When the current pressure difference is greater than or equal to the difference value, which indicates that the pressure difference in the room at this time has met the requirement, the blower fan 10 is controlled to maintain the current rotation speed (step S825), and the control method ends here. When the current pressure difference is smaller than the difference, the step S822 of controlling the rotation speed of the blower fan 10 to increase the first wind speed and maintaining the first preset time period is repeated until the current pressure difference is greater than or equal to the difference.
As shown in fig. 4, if the result of the determination in step 821 is negative, it is described that the air supply damper corresponding to the room does not reach the maximum opening at this time, and the air supply amount of the room can be increased by increasing the opening. Therefore, step S826 is performed to control the opening degree of the corresponding blast damper to increase by the first predetermined opening degree and to maintain for the second preset time period. In one or more embodiments, the first predetermined opening is 6%. Alternatively, the first predetermined opening degree may be set to other suitable opening degrees more or less than 6%. Further, the second preset time period is 17 s. Alternatively, the second preset time period is also set to other suitable times longer or shorter than 17 s. Next, step S827 is executed to re-detect the pressure difference of the corresponding room. Then, the measured current pressure difference is compared with the difference value (step S828). When the current differential pressure is greater than or equal to the difference value, which indicates that the differential pressure in the room at this time has met the requirement, the corresponding supply air valve is controlled to maintain the current opening (step S829), and the control method ends here. When the current differential pressure is smaller than the difference, step S826 is repeated, that is, the step of controlling the opening degree of the corresponding supply air valve to increase by the first predetermined opening degree and maintaining for the second predetermined time period is repeated until the current differential pressure is greater than or equal to the difference.
Fig. 5 is a second partial flowchart of the control method of the ventilating system in accordance with the second embodiment of the present invention. The third comparison result obtained in step S7 is that the differential pressure in the corresponding room is equal to or greater than the sum of the set differential pressure and the second pressure correction value. As shown in fig. 5, when the differential pressure in the corresponding room is equal to or greater than the sum of the set differential pressure and the second pressure correction value, it is described that the differential pressure in the room is too large, that is, the exhaust air volume in the room is less than the air volume, and the air volume in the room needs to be decreased. Therefore, the control method proceeds to step S831, the opening degree of each blower valve is acquired. Next, the opening degree of each blower valve is compared with the maximum opening degree (step S832). When the opening degree of each of the blast air valves is smaller than the maximum opening degree (step S833), it means that the remaining air volume of the blast air blower 10 is too large at this time, and therefore the rotation speed of the blast air blower 10 is controlled to be reduced by the second air speed and maintained for the third preset time period (step S834). In one or more embodiments, the second wind speed is 5 m/s. Alternatively, the second wind speed may be set to other suitable data greater or less than 5 m/s. Further, the third preset time period is 16 s. Alternatively, the third preset time period may be set to other suitable times longer or shorter than 16 s. Then, the pressure difference of the corresponding room is redetected (step S835). The current differential pressure is then compared with the sum value (i.e., the accumulated value of the set differential pressure and the second pressure correction value) (step S836). When the current pressure difference is smaller than the sum, which indicates that the pressure difference in the room at this time has met the requirement, the blower fan 10 is controlled to maintain the current rotation speed (step 837), and the control method ends here. When the current differential pressure is greater than or equal to the sum, the step S834, that is, the step of controlling the rotation speed of the blower fan 10 to decrease the second wind speed and maintaining the second wind speed for the third preset time period is repeated until the current differential pressure is less than the sum.
As shown in fig. 5, when the opening degree of at least one of the blast air valves is the maximum opening degree after the execution of step 832 (step S838), it will be described that the remaining air volume of the blast fan 10 is not large at this time, and the rotation speed of the blast fan 10 does not need to be reduced. Therefore, step S839 is executed to control the opening degree of the blast air valve of the corresponding room to be decreased by the second predetermined opening degree for a fourth preset time period, wherein the differential pressure of the corresponding room is equal to or greater than the sum value. In one or more embodiments, the second predetermined opening is 5%. Alternatively, the second predetermined opening degree may be set to other suitable opening degrees more or less than 5%. Further, the fourth preset time period is 15 s. Alternatively, the fourth preset time period may be set to other suitable times longer or shorter than 15 s. Next, step S840 is performed to re-detect the pressure difference of the corresponding room. Then, the measured current differential pressure is compared with the sum value (step S841). When the current differential pressure is smaller than the sum, which indicates that the differential pressure in the room at this time has satisfied the requirement, the corresponding blast damper is controlled to maintain the current opening degree (step S842), and the control method ends here. When the current differential pressure is greater than or equal to the sum, the step S839 of decreasing the opening degree of the blast damper corresponding to the room by the second predetermined opening degree and maintaining the same for the fourth preset time period is repeatedly performed until the current differential pressure is greater than or equal to the difference.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the invention, a person skilled in the art may combine technical features from different embodiments, and may make equivalent changes or substitutions for related technical features, and such changes or substitutions will fall within the scope of the invention.

Claims (10)

1. A control method of a ventilation system, wherein the ventilation system includes an exhaust fan configured to communicate with at least one room to be conditioned through an exhaust duct having an exhaust air valve and a supply fan configured to communicate with the at least one room through a supply duct having a supply air valve, and the control method comprises:
determining a target value of the air exhaust speed of each room based on the volume of each room, the set air exchange times and the area of an air exhaust outlet of the air exhaust pipeline;
determining a target value of the air supply speed of each room based on the target value of the air exhaust speed;
detecting the air exhaust speed and the air supply speed of each room;
respectively comparing the measured air exhaust speed and the measured air supply speed with the corresponding target values of the air exhaust speed and the air supply speed;
controlling the rotation speeds of the exhaust fan and the supply fan based on the comparison result, and controlling the opening degrees of the exhaust air valve and the supply air valve corresponding to each room so that the exhaust air speed is equal to or higher than the exhaust air speed target value and the supply air speed is equal to or higher than the supply air speed target value,
wherein the air exhaust speed is greater than the air supply speed.
2. The control method of a ventilating system according to claim 1, wherein the target value of the discharged wind speed is equal to the volume of the room multiplied by the set ventilation times and divided by the area of the discharge opening.
3. The control method of a ventilating system according to claim 1, wherein the supply air speed target value is equal to the discharge air speed target value multiplied by a preset coefficient,
wherein the preset coefficient is greater than or equal to 0.8 and less than 1.
4. The control method of a ventilation system according to claim 1, wherein the at least one room includes a plurality of rooms, each of the rooms being provided with the corresponding discharge air valve and supply air valve, and the control method further comprises:
detecting a pressure difference of each room when the exhaust air speed is greater than or equal to the exhaust air speed target value and when the supply air speed is greater than or equal to the supply air speed target value;
comparing the measured differential pressure with a set differential pressure;
and controlling the rotating speed of the air supply fan and/or the opening degree of the corresponding air supply air valve based on the comparison result of the pressure difference and the set pressure difference.
5. The control method of a ventilation system according to claim 4,
and when the differential pressure is greater than or equal to the difference value between the set differential pressure and the first pressure correction value and is smaller than the sum value between the set differential pressure and the second pressure correction value, controlling the air supply fan to keep the current rotating speed and controlling the corresponding air supply air valve to keep the current opening.
6. The control method of a ventilation system according to claim 5,
when the differential pressure is smaller than the difference value, judging whether the corresponding opening degree of the air supply air valve is the maximum opening degree;
when the opening degree of the air supply air valve is the maximum opening degree, controlling the rotating speed of the air supply fan to increase a first air speed and keeping a first preset time period;
re-detecting the pressure difference of the room;
comparing the current differential pressure to the difference value;
when the current differential pressure is smaller than the difference value, the step of repeatedly controlling the rotating speed of the air supply fan to increase a first air speed and keeping the rotating speed for a first preset time period;
and when the current differential pressure is larger than or equal to the difference value, controlling the air supply fan to keep the current rotating speed.
7. The control method of a ventilation system according to claim 6,
when the opening degree of the air supply air valve is smaller than the maximum opening degree, controlling the opening degree of the corresponding air supply air valve to increase by a first preset opening degree and keeping for a second preset time period;
re-detecting the pressure difference of the room;
comparing the current differential pressure to the difference value;
when the current differential pressure is smaller than the difference value, the step of repeatedly controlling the opening degree of the corresponding air supply air valve to increase by a first preset opening degree and keeping for a second preset time period;
and when the current differential pressure is larger than or equal to the difference value, controlling the air supply air valve to keep the current opening.
8. The control method of a ventilation system according to claim 5,
when the differential pressure is larger than or equal to the sum value, the opening degree of each air supply air valve is obtained;
comparing the opening degree of each air supply air valve with the maximum opening degree;
when the opening degree of each air supply air valve is smaller than the maximum opening degree, controlling the rotating speed of the air supply fan to reduce a second air speed and keeping a third preset time period;
repeatedly detecting a pressure difference of the room;
when the current pressure difference is larger than or equal to the sum, the step of repeatedly controlling the rotating speed of the air supply fan to reduce the second air speed and keeping the rotating speed for a third preset time period;
and when the current differential pressure is smaller than the sum, controlling the air supply fan to keep the current rotating speed.
9. The control method of a ventilation system according to claim 8,
when the opening degree of at least one air supply air valve is the maximum opening degree, controlling the opening degree of the air supply air valve corresponding to the room to be reduced by a second preset opening degree and keeping for a fourth preset time period, wherein the differential pressure corresponding to the room is larger than or equal to the sum value;
repeatedly detecting a pressure difference of the room;
when the current differential pressure is larger than or equal to the sum value, the step of repeatedly controlling the opening degree of the air supply air valve corresponding to the room to reduce a second preset opening degree and keeping the opening degree for a fourth preset time period;
and when the current differential pressure is smaller than the sum value, controlling the air supply air valve corresponding to the room to keep the current opening.
10. A ventilation system, characterized in that the ventilation system comprises:
an exhaust fan configured to communicate with at least one room being conditioned through an exhaust duct having an exhaust air valve;
an air supply fan configured to communicate with the at least one room through an air supply duct having an air supply air valve; and is
The ventilation system uses the control method according to any one of claims 1 to 9.
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CN116105324A (en) * 2023-04-13 2023-05-12 青岛市人防建筑设计研究院有限公司 Civil air defense engineering ventilation control system based on wireless transmission
CN116697548A (en) * 2023-08-10 2023-09-05 江苏悦岩医学科技有限公司 Be applied to purification air conditioning unit and purification air conditioning unit intelligent control system of hospital
EP4261469A1 (en) * 2022-04-12 2023-10-18 Viessmann Climate Solutions SE Method for controlling a ventilation system, ventilation system and control device

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