Control method of air conditioning system and air conditioning system

Abstract

The invention provides a control method of an air conditioning system and the air conditioning system.The air conditioning system is provided with an exhaust fan and an exhaust pipe, the exhaust fan is used for exhausting indoor air to the outside in the working state, and the control method comprises the steps that when the air conditioning system is applied to the urgent working condition, the exhaust fan is controlled to work so that the indoor environment can be in the negative pressure environment, and the exhaust pipe is used for exhausting the indoor air to the outside; the indoor air pressure is between Pa and Pb; and when the air conditioning system is applied to normal working conditions, the exhaust fan is controlled to stop working. According to the air conditioning system, when the air conditioning system is applied to the ward, due to the fact that the air conditioning system is provided with the air exhaust fan and the air exhaust pipe, the air exhaust fan is controlled to work to enable the ward to be in a negative pressure environment when facing the urgent working condition of epidemic outbreak, and air in a corridor can flow to the ward at the moment when medical staff enter and exit the ward and open the door; air in the sickroom cannot diffuse to the corridor, so that viruses in the sickroom cannot spread outwards, and epidemic situation diffusion is controlled by using the air conditioning system.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to a control method of an air conditioning system and an air conditioning system. Background Art

[0002] At present, in order to cope with the sudden airborne epidemics that may occur in the future, it is proposed to add the design concept of combining normal and emergency into the design of HVAC in ordinary public buildings. The HVAC system is the "breathing system" of the building. People cannot survive without breathing, and the indoor air quality of the building will not meet people's basic needs without "breathing". The combination of normal and emergency includes normal working conditions and emergency working conditions. Emergency working conditions mainly refer to epidemics. In order to consider emergency measures, it is necessary to prepare for emergencies in advance during the architectural design stage.

[0003] In the hospital's inpatient ward environment, the air conditioning in the inpatient ward is usually just to provide a comfortable environment for the patients, and the air conditioning system is simple and reliable. However, after an epidemic breaks out, the epidemic is generally transmitted through the respiratory tract and spread by air. At this time, the air conditioning system is particularly important for epidemic control, but the usual air conditioning system cannot prevent the spread of the epidemic in the ward. Summary of the invention

[0004] Therefore, the present invention provides a control method for an air-conditioning system, which can solve the technical problem that ordinary air-conditioning systems in wards cannot prevent the spread of epidemics in the wards.

[0005] In order to solve the above problems, the present invention provides a control method of an air conditioning system, wherein the air conditioning system is equipped with an exhaust fan, and the exhaust fan is used to exhaust indoor air to the outdoors in a working state;

[0006] The control method comprises: when the air conditioning system is used in an emergency condition, controlling the exhaust fan to operate so that the room is in a negative pressure environment, and the indoor air pressure is P 1 , P a ≤P 1 ≤P b , where P a is the first air pressure setting value, P b is the second air pressure setting value, P a <P b When the air conditioning system is used in normal working conditions, the exhaust fan is controlled not to work so that the room is in a positive pressure environment.

[0007] In some embodiments, the air conditioning system is further configured with a fresh air blower, which is used to introduce outdoor fresh air into the room when in operation; the outdoor temperature is obtained and recorded as T 1 , when the air conditioning system is used in emergency conditions, and T a ≤T1 ≤T b When the fresh air fan is controlled to work, the amount of fresh air introduced into the room by the fresh air fan is required to be less than the amount of exhaust air discharged from the room to the outside by the exhaust fan; wherein, T a is the first temperature setting value, T b is the second temperature setting value, T a <T b .

[0008] In some embodiments, the air conditioning system is further configured with a fresh air fan, which is used to introduce outdoor fresh air into the room when in operation. The air conditioning system also has a return air vent and an air outlet. The outdoor temperature is obtained and recorded as T 1 , when the air conditioning system is used in emergency conditions, and T 1 <T a , the fresh air fan is controlled to work, requiring the fresh air volume introduced into the room by the fresh air fan to be less than the exhaust air volume discharged from the room to the outside by the exhaust fan, and the air conditioning system is controlled to heat the room through the return air outlet and the outlet; wherein, T a is the first temperature setting value.

[0009] In some embodiments, the air conditioning system is further configured with a fresh air fan, which is used to introduce outdoor fresh air into the room when in operation. The air conditioning system also has a return air vent and an air outlet. The outdoor temperature is obtained and recorded as T 1 , when the air conditioning system is used in emergency conditions, and T 1 >T b , the fresh air fan is controlled to work, requiring the fresh air volume introduced into the room by the fresh air fan to be less than the exhaust air volume discharged from the room to the outside by the exhaust fan, and the air conditioning system is controlled to return air through the return air outlet and discharge air through the air outlet to cool the room; wherein, T b is the second temperature setting value.

[0010] In some embodiments, when P<P a When P>P b When the exhaust fan is turned on, the speed of the exhaust fan is controlled to increase and / or the speed of the fresh air fan is controlled to decrease.

[0011] In some embodiments, the air conditioning system is further configured with a fresh air blower, which is used to introduce outdoor fresh air into the room when in operation; the outdoor temperature is obtained and recorded as T 1 , when the air conditioning system is used in normal working conditions, and T c ≤T 1 ≤T bWhen the fresh air fan is controlled to work; wherein, T c is the third temperature setting value, T d is the fourth temperature setting value, T c <T d .

[0012] In some embodiments, the air conditioning system further has a return air vent and an air outlet; the outdoor temperature is obtained and recorded as T 1 , when the air conditioning system is used in normal working conditions, and T 1 <T c When the air conditioning system is controlled to heat the room by returning air through the return air outlet and discharging air through the air outlet; wherein, T c is the third temperature setting value.

[0013] In some embodiments, the air conditioning system further has a return air vent and an air outlet; the outdoor temperature is obtained and recorded as T 1 , when the air conditioning system is used in normal working conditions, and T 1 >T d When the air conditioning system is controlled to return air through the return air outlet and discharge air through the air outlet to cool the room; wherein, T d It is the fourth temperature setting value.

[0014] In some embodiments, the air conditioning system is further configured with a fresh air blower, which is used to introduce outdoor fresh air into the room when in operation; the heat value Q consumed by the air conditioning system is obtained. 1 , when Q 1 ≥50%Q, the fresh air fan is controlled to work; or when Q 1 When <50%Q, the fresh air fan is controlled not to work; wherein Q is the heat setting value.

[0015] In some embodiments, the air-conditioning system is further configured with a first exhaust duct section and a second exhaust duct section, one end of the first exhaust duct section extends to the outdoors, the other end of the first exhaust duct section is connected to the air-conditioning system, the second exhaust duct section is indoors and detachably connected to the air-conditioning system, a filter is installed at one end of the second exhaust duct section away from the air-conditioning system, the filter is used to filter viruses, the exhaust fan discharges indoor air to the outdoors through the first exhaust duct section and the second exhaust duct section, when the air-conditioning system is used in emergency conditions, the second exhaust duct section is installed on the air-conditioning system, and when the air-conditioning system is used in normal conditions, the second exhaust duct section is removed from the air-conditioning system; and / or the air-conditioning system is a fan coil unit.

[0016] The present invention further provides an air conditioning system, wherein the air conditioning system is controlled and operated by the aforementioned control method.

[0017] The present invention provides a control method and an air conditioning system, which have the following beneficial effects:

[0018] When the air conditioning system of the present application is applied to the ward, since the air conditioning system is equipped with an exhaust fan and an exhaust duct, when facing the emergency working condition of the outbreak of the epidemic, the exhaust fan can be controlled to work so that the ward is in a negative pressure environment. Then, at the moment when the medical staff enters and leaves the ward and opens the door, the air in the corridor will flow to the ward, and the air in the ward will not spread to the corridor, so that the virus in the ward will not spread outward, and then the air conditioning system can be used to control the spread of the epidemic. Because the patients living in the ward are relatively weak, too strong negative pressure will make the patients very uncomfortable, and too weak negative pressure cannot guarantee that the air in the ward will not spread to the corridor at the moment of opening the door, so the negative pressure in the ward should also be controlled within a reasonable range. Practice has proved that the negative pressure in the ward is more suitable between -17Pa and -13Pa. It can be understood that under normal working conditions, it is only necessary to control the exhaust fan not to work so that the ward is in a normal positive pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 is a schematic diagram of an air conditioning system in an emergency condition according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of an air conditioning system in normal working conditions according to an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of an air conditioning system according to an embodiment of the present invention applied to multiple wards;

[0023] Figure 4 4 is a control flow chart of an air conditioning system according to an embodiment of the present invention.

[0024] The reference numerals are as follows:

[0025] 1. Exhaust duct; 11. First exhaust duct section; 12. Second exhaust duct section; 2. Fresh air duct; 3. Ward; 4. Corridor. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] See also Figures 1 to 4According to an embodiment of the present invention, a control method for an air conditioning system is provided. The air conditioning system is equipped with an exhaust fan (not shown in the figure). The exhaust fan is used to exhaust indoor air to the outside when in operation. The control method includes: when the air conditioning system is used in an emergency condition, the exhaust fan is controlled to work so that the indoor air is in a negative pressure environment, and the indoor air pressure is P 1 , P a ≤P 1 ≤P b , where P a is the first air pressure setting value, P b is the second air pressure setting value, P a <P b ; When the air conditioning system is operating under normal conditions, the exhaust fan is controlled not to work to keep the room in a positive pressure environment.

[0031] In this technical solution, when the air conditioning system of the present application is applied to the ward, since the air conditioning system is equipped with an exhaust fan and an exhaust duct 1, when facing an emergency condition of an epidemic outbreak, the exhaust fan can be controlled to work so that the ward 3 is in a negative pressure environment. Then, at the moment when the medical staff enters and exits the ward 3 and opens the door, the air in the corridor 4 will flow into the ward 3, and the air in the ward 3 will not spread to the corridor 4, so that the virus in the ward 3 will not spread outward, and the air conditioning system can be used to control the spread of the epidemic. Because the patients living in the ward 3 are relatively weak, too strong a negative pressure will make the patients very uncomfortable, and too weak a negative pressure cannot guarantee that the air in the ward 3 will not spread to the corridor 4 at the moment the door is opened, so the negative pressure in the ward 3 must also be controlled within a reasonable range. Practice has shown that the negative pressure in the ward 3 is more suitable between -17Pa and -13Pa. Among them, P a is -17Pa, P b is -13Pa, preferably, P 1 =-15Pa is the most suitable. The air conditioning system is also equipped with an exhaust duct 1, the exhaust fan is indoors and corresponds to the exhaust duct 1, and one end of the exhaust duct 1 extends to the outdoors. It can be understood that under normal working conditions, it is only necessary to control the exhaust fan not to work so that the ward 3 is in a normal positive pressure environment. Of course, the air conditioning system of this application can also be applied to isolation rooms during epidemics.

[0032] See also Figure 1 and Figure 4 As shown, the air conditioning system is also equipped with a fresh air fan (not shown in the figure), which is used to introduce outdoor fresh air into the room when in working state. The outdoor temperature is recorded as T 1 , when the air conditioning system is used in emergency conditions, and T a ≤T 1 ≤T bWhen , the fresh air fan is controlled to work, and the fresh air volume introduced into the room by the fresh air fan is required to be less than the exhaust air volume discharged from the room to the outside by the exhaust fan. a is the first temperature setting value, T b is the second temperature setting value, T a <T b .

[0033] In this embodiment, T a At 15°C, T b The outdoor temperature is 25℃. 1 Obtained by a temperature sensor installed outdoors. When the outdoor temperature is between 15°C and 25°C, it indicates that the outdoor temperature is relatively suitable, and outdoor fresh air can be introduced into ward 3 to improve the air quality in ward 3, ensuring fresh indoor air while the air conditioner is running green and low-carbon. Of course, the amount of fresh air introduced into ward 3 by the fresh air fan is smaller than the amount of exhaust air discharged from ward 3 to the outside by the exhaust fan, so as to ensure that ward 3 is still in a negative pressure environment, thereby ensuring that the spread of the epidemic can be controlled. Practice has shown that when the exhaust air volume is 1.3 times the fresh air volume, it is easier to maintain the negative pressure in ward 3 between -17Pa and -13Pa. Among them, the air conditioning system is also equipped with a fresh air duct 2, the fresh air fan is indoors and corresponds to the fresh air duct 2, and one end of the fresh air duct 2 extends to the outdoors.

[0034] See also Figure 1 and Figure 4 As shown, the air conditioning system also has a return air vent and an air outlet, and the outdoor temperature is recorded as T 1 , when the air conditioning system is used in emergency conditions, and T 1 <T a When , the fresh air fan is controlled to work, requiring the fresh air volume introduced into the room by the fresh air fan to be less than the exhaust air volume discharged from the room to the outside by the exhaust fan, and the air conditioning system is controlled to heat the room through the return air outlet and the outlet. a is the first temperature setting value.

[0035] In this technical solution, when T 1 When the temperature is less than 15℃, it indicates that the outdoor temperature is low. In emergency mode, if only outdoor fresh air is introduced into ward 3 to improve the air quality in ward 3, the temperature in ward 3 will be low, which is very unfavorable for weak patients. Therefore, it is also necessary to make the air-conditioning system use the return air from the return air vent and the outlet air to heat the room, so as to ensure that the ward 3 is a suitable warm environment. It should be noted that the air-conditioning system of the present application can be a fluorine cycle air-conditioning unit or a water cycle fan coil. Preferably, the air-conditioning system is a fan coil, because it is more convenient to install a fan coil in ward 3, unlike the fluorine cycle air-conditioning unit, which also requires the installation of an outdoor unit outside each ward 3.

[0036] See also Figure 1 and Figure 4 As shown, the outdoor temperature is recorded as T 1 , when the air conditioning system is used in emergency conditions, and T 1 >T b When the fresh air fan is controlled to work, the amount of fresh air introduced into the room by the fresh air fan is required to be smaller than the amount of exhaust air discharged from the room to the outside by the exhaust fan, and the air conditioning system is controlled to return air through the return air vent and discharge air through the air outlet to cool the room.

[0037] In this embodiment, when T 1 When the temperature is higher than 25℃, it indicates that the outdoor temperature is high. In the emergency mode, if only outdoor fresh air is introduced into the ward 3 to improve the air quality in the ward 3, the temperature in the ward 3 will be high, which is still very unfavorable for weak patients. Therefore, it is also necessary to make the air conditioning system use the return air outlet and the outlet air outlet to cool the room, so as to ensure that the ward 3 is a suitable cool environment.

[0038] As a specific implementation method, when P < -17Pa, it indicates that the negative pressure in ward 3 is too strong, which will make the patient feel uncomfortable. Therefore, it is necessary to control the speed of the exhaust fan to reduce the exhaust volume, or control the speed of the fresh air fan to increase the fresh air volume, or control the speed of the exhaust fan to reduce and the speed of the fresh air fan to increase at the same time to restore the negative pressure in ward 3 to above -17Pa. When P > -13Pa, it indicates that the negative pressure in ward 3 is too weak, and it is impossible to ensure that the air in ward 3 will not diffuse to corridor 4 at the moment of opening the door. Therefore, it is necessary to control the speed of the exhaust fan to increase to increase the small exhaust volume, or control the speed of the fresh air fan to reduce to reduce the fresh air volume, or control the speed of the exhaust fan to increase and the speed of the fresh air fan to reduce at the same time to restore the negative pressure in ward 3 to below -13Pa.

[0039] See also Figure 2 and Figure 4 As shown, the outdoor temperature is recorded as T 1 , when the air conditioning system is used in normal working conditions, and T c ≤T 1 ≤T b When the fresh air fan is controlled to work. c is the third temperature setting value, T d is the fourth temperature setting value, T c <T d .

[0040] In this technical solution, T c At 20℃, T dWhen the outdoor temperature is between 20℃ and 25℃, it indicates that the outdoor temperature is suitable. It is judged as the transition season. Under normal working conditions, the air conditioning system can improve the air quality in ward 3 only by introducing outdoor fresh air. At this time, only the fresh air fan of the unit is running, and the air conditioner operates in a green and low-carbon manner, making full use of natural energy.

[0041] See also Figure 2 and Figure 4 As shown, the outdoor temperature is recorded as T 1 , when the air conditioning system is used in normal working conditions, and T 1 <T c When the air conditioner is turned on, the air conditioning system is controlled to heat the room by returning air from the return air vent and discharging air from the air outlet.

[0042] In this embodiment, when T 1 When the temperature is less than 20℃, it indicates that the outdoor temperature is low. If the outdoor fresh air is introduced into ward 3 by controlling the operation of the fresh air fan, the temperature in ward 3 will be lower. At this time, the outdoor conditions are not suitable for use. Therefore, under normal working conditions, when T 1 When the temperature is less than 20℃, the air conditioning system can heat the room by using the return air from the return air vent and the outlet air from the outlet, thereby ensuring that the ward 3 is a suitable warm environment.

[0043] See also Figure 2 and Figure 4 As shown, the outdoor temperature is recorded as T 1 , when the air conditioning system is used in normal working conditions, and T 1 >T d When the air conditioner is turned on, the air conditioning system is controlled to cool the room by returning air from the return air vent and discharging air from the air outlet.

[0044] In this technical solution, when T 1 When the temperature is higher than 25℃, it indicates that the outdoor temperature is high. Under normal working conditions, if the outdoor fresh air is introduced into ward 3 by controlling the operation of the fresh air fan to improve the air quality in ward 3, the temperature in ward 3 will also be high. At this time, the outdoor conditions are not suitable for use. Therefore, under normal working conditions, the air conditioning system can use the return air from the return air outlet and the outlet air to cool the room, thereby ensuring that ward 3 is a suitable cool environment.

[0045] See also Figure 2 and Figure 4 As shown, the heat value Q consumed by the air conditioning system is obtained. 1 , when Q 1 ≥50%Q, control the fresh air fan to work; or when Q 1 When <50%Q, the fresh air fan is controlled not to work. Q is the heat setting value.

[0046] In this embodiment, a heat meter is installed in the air conditioning system to obtain the heat value consumed by the air conditioning system during operation. 1 When Q is ≥50%, it indicates that the load of the air conditioning system is large. It can be determined that there are people entering and leaving Ward 3 many times. The carbon dioxide concentration in Ward 3 is high and the oxygen content is low. Therefore, it is necessary to control the operation of the fresh air fan to increase the oxygen content of the air in Ward 3 by introducing outdoor fresh air. 1 When Q is less than 50%, it indicates that the load of the air-conditioning system is small. It can be determined that no one enters and exits Ward 3 many times, and the oxygen content of the air in Ward 3 is normal. There is no need to introduce outdoor fresh air to increase the oxygen content. Therefore, the fresh air fan is controlled not to work.

[0047] See also Figure 1 and Figure 2 As shown, the exhaust duct 1 includes a first exhaust duct section 11 and a second exhaust duct section 12. One end of the first exhaust duct section 11 extends to the outdoors, and the other end of the first exhaust duct section 11 is connected to the air conditioning system. The second exhaust duct section 12 is indoors and detachably connected to the air conditioning system. A filter is installed at one end of the second exhaust duct section 12 away from the air conditioning system, and the filter is used to filter viruses. When the air conditioning system is used in emergency conditions, the second exhaust duct section 12 is installed on the air conditioning system; when the air conditioning system is used in normal conditions, the second exhaust duct section 12 is removed from the air conditioning system.

[0048] In this technical solution, since the end of the second exhaust duct section 12 away from the air conditioning system is provided with a filter for filtering viruses, the mesh of the filter is small and the grade requirement is high. It is easy to be blocked and ineffective when exposed to the air for a long time when not in use, so the second exhaust duct section 12 is designed to be detachably connected. Then, the second exhaust duct section 12 can be removed and packaged for storage under normal working conditions, and the second exhaust duct section 12 can be installed again under emergency working conditions, thereby ensuring the service life of the second exhaust duct section 12 and realizing the switching of the air conditioning system from normal to emergency. Further, the second exhaust duct section 12 can be removed when not needed to make room for the ward 3. Preferably, the second exhaust duct section 12 extends between the two diagonals of the ward 3, so that the air in the ward 3 can be completely replaced when exhausting. Among them, the second exhaust duct section 12 adopts a detachable connection method such as a snap-on type and a crimping type. The exhaust fan is indoors, and the exhaust fan corresponds to the first exhaust duct section 11 and the second exhaust duct section 12 at the same time.

[0049] Figure 4 The control flow chart of the air conditioning system according to the embodiment of the present invention is shown in FIG. Figure 4 The cooling load is the heat value Q 1; The fresh air mode in normal mode means that the air conditioning system only controls the fresh air fan to work when it is used in normal working conditions; the full return air mode in normal mode means that the air conditioning system only uses the return air outlet and the outlet to work when it is used in normal working conditions; the fresh air + return air mode in normal mode means that when the air conditioning system is used in normal working conditions, it not only controls the fresh air fan to work, but also uses the return air outlet and the outlet to work. The exhaust fan is the exhaust fan. In the emergency mode, the fresh air fan and the exhaust fan of the air conditioning system work at the same time. If the return air mode is added, the air conditioning system not only controls the fresh air fan and the exhaust fan to work at the same time, but also uses the return air outlet and the outlet to work.

[0050] Finally, it should be noted that the air-conditioning system of the present application can be independently installed in each ward 3, and each ward 3 does not affect each other, so there is no problem of cross infection.

[0051] The present invention also provides an air conditioning system, and the air conditioning system is controlled and operated by the aforementioned control method.

[0052] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that: The air conditioning system is equipped with an exhaust fan, which is used to exhaust indoor air to the outside when in working state; The control method includes: when the air conditioning system is used in an emergency condition, controlling the exhaust fan to work so that the room is in a negative pressure environment, and the indoor air pressure is P1, P a ≤P1≤P b , where P a is the first air pressure setting value, P b is the second air pressure setting value, P a <P b When the air conditioning system is used in normal working conditions, the exhaust fan is controlled not to work so that the room is in a positive pressure environment.

2. The control method of the air conditioning system according to claim 1, characterized in that: The air conditioning system is also equipped with a fresh air fan, which is used to introduce outdoor fresh air into the room when in operation; The outdoor temperature is recorded as T1. When the air conditioning system is used in an emergency condition, and T a ≤T1≤T b When the fresh air fan is in the working state, the fresh air volume introduced into the room by the fresh air fan is required to be less than the exhaust air volume discharged from the room to the outside by the exhaust air fan; Among them, T a is the first temperature setting value, T b is the second temperature setting value, T a <T b .

3. The control method of the air conditioning system according to claim 1, characterized in that: The air conditioning system is also equipped with a fresh air fan, which is used to introduce outdoor fresh air into the room when in working state. The air conditioning system also has a return air outlet and an air outlet; The outdoor temperature is recorded as T1. When the air conditioning system is used in an emergency condition and T1 < T a When the fresh air fan is in the working state, the fresh air volume introduced into the room by the fresh air fan is required to be less than the exhaust air volume discharged from the room to the outside by the exhaust air fan, and the air conditioning system is controlled to heat the room by returning air through the return air outlet and discharging air through the air outlet; Among them, T a is the first temperature setting value.

4. The control method of the air conditioning system according to claim 1, characterized in that: The air conditioning system is also equipped with a fresh air fan, which is used to introduce outdoor fresh air into the room when in working state. The air conditioning system also has a return air outlet and an air outlet; The outdoor temperature is recorded as T1. When the air conditioning system is used in an emergency condition and T1>T b When the fresh air fan is in the working state, the fresh air volume introduced into the room by the fresh air fan is required to be less than the exhaust air volume discharged from the room to the outside by the exhaust air fan, and the air conditioning system is controlled to return air through the return air outlet and discharge air through the air outlet to cool the room; Among them, T b is the second temperature setting value.

5. The control method of the air conditioning system according to any one of claims 2 to 4, characterized in that: When P<P a When P>P b When the exhaust fan is turned on, the speed of the exhaust fan is controlled to increase and / or the speed of the fresh air fan is controlled to decrease.

6. The control method of the air conditioning system according to claim 1, characterized in that: The air conditioning system is also equipped with a fresh air fan, which is used to introduce outdoor fresh air into the room when in working state; The outdoor temperature is recorded as T1. When the air conditioning system is used in normal working conditions, and T c ≤T1≤T b When the fresh air fan is controlled to operate; Among them, T c is the third temperature setting value, T d is the fourth temperature setting value, T c <T d .

7. The control method of the air conditioning system according to claim 1, characterized in that: The air conditioning system also has an air return vent and an air outlet; The outdoor temperature is recorded as T1. When the air conditioning system is used in normal working conditions and T1<T c When the air conditioner is in the air conditioner, the air conditioner is controlled to heat the room by returning air through the return air outlet and discharging air through the air outlet; Among them, T c is the third temperature setting value.

8. The control method of the air conditioning system according to claim 1, characterized in that: The air conditioning system also has an air return vent and an air outlet; The outdoor temperature is recorded as T1. When the air conditioning system is used in normal working conditions and T1>T d When the air conditioner is in the air conditioner, the air conditioner is controlled to return air through the return air outlet and discharge air through the air outlet to cool the room; Among them, T d It is the fourth temperature setting value.

9. The control method of the air conditioning system according to claim 7 or 8, characterized in that: The air conditioning system is also equipped with a fresh air fan, which is used to introduce outdoor fresh air into the room when in working state; Obtain the heat value Q1 consumed by the air conditioning system, and when Q1≥50%Q, control the fresh air fan to work; or when Q1<50%Q, control the fresh air fan not to work; Among them, Q is the heat setting value.

10. The control method of the air conditioning system according to claim 1, characterized in that: The air conditioning system is further provided with a first exhaust duct section (11) and a second exhaust duct section (12), one end of the first exhaust duct section (11) extends to the outdoors, the other end of the first exhaust duct section (11) is connected to the air conditioning system, the second exhaust duct section (12) is located indoors and is detachably connected to the air conditioning system, a filter is installed at one end of the second exhaust duct section (12) away from the air conditioning system, the filter is used to filter viruses, the exhaust fan discharges indoor air to the outdoors through the first exhaust duct section (11) and the second exhaust duct section (12), when the air conditioning system is used in emergency conditions, the second exhaust duct section (12) is installed on the air conditioning system, and when the air conditioning system is used in normal conditions, the second exhaust duct section (12) is removed from the air conditioning system; and / or the air conditioning system is a fan coil unit.

11. An air conditioning system, characterized in that: The air conditioning system is controlled and operated by the control method according to any one of claims 1 to 10.

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