Air conditioner operation method and air conditioner

Abstract

The air conditioner operation method comprises the steps that the temperature value and the humidity value in a room are obtained, and the indoor enthalpy value H1 is obtained through calculation according to the temperature value and the humidity value; a temperature value and a humidity value outside the room are obtained, and an outdoor enthalpy value H2 is calculated according to the temperature value and the humidity value; the difference value delta H1 between the indoor enthalpy value H1 and the target enthalpy value H and the difference value delta H2 between the outdoor enthalpy value H2 and the target enthalpy value H are calculated; when the absolute value of the delta H1 is greater than or equal to a preset value, judging whether the product of the delta H1 and the delta H2 is less than or equal to 0; when delta H1 * delta H2 is smaller than or equal to 0, a return fan is started, and the opening degree of a fresh air valve is adjusted to the first opening degree; and when delta H1 * delta H2 is larger than 0, the return fan is closed, the opening degree of the fresh air valve is adjusted to the second opening degree, and the second opening degree is smaller than the first opening degree. The return fan can be intelligently controlled to be turned on when needed and turned off when not needed, so that the energy consumption of the air conditioner is reduced, and the operation cost is reduced. The invention further discloses the air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly relates to an air conditioner operation method and an air conditioner. BACKGROUND

[0002] Large process air conditioners mostly use double fans, that is, a supply fan and a return fan are connected in series to complete air transportation and replacement. The supply fan mainly sends the treated fresh air and part of the return air to the room. The return fan mainly draws the air in the room back to the air conditioner for temperature and humidity treatment, and at the same time, part of the return air is discharged through the exhaust port of the return fan to the air to achieve the purpose of supplementing fresh air to the room, controlling the room pressure, and reducing the heat and humidity load of the air conditioner.

[0003] However, the energy consumption of many air conditioners is high, which increases the operation cost of the air conditioner. SUMMARY

[0004] The present application aims to solve the problems of high energy consumption and high operation cost of the air conditioner. The present application provides an air conditioner operation method and an air conditioner, which can reduce the energy consumption of the air conditioner and reduce the operation cost.

[0005] The applicant has found that the main reason for the high energy consumption of the air conditioner is that the return fan of many air conditioners runs all year round. However, in some cases, the operation of the return fan not only does not produce the desired effect, but also increases the operating energy consumption. For example, when the return fan is turned on, the exhaust section is not in a slightly positive pressure state but in a negative pressure state. At this time, the exhaust section does not successfully discharge part of the return air to the outdoor, cannot effectively control the pressure in the room, and instead greatly increases the operating energy consumption.

[0006] To solve the above technical problems, the embodiments of the present application disclose an air conditioner operation method, which can intelligently control the return fan to be turned on when needed and turned off when not needed, thereby reducing the energy consumption of the air conditioner and reducing the operation cost.

[0007] Specifically, the air conditioner is provided with a supply fan, a return fan, a fresh air valve and an exhaust valve. The outdoor fresh air can enter the inside of the air conditioner through the fresh air valve. The supply fan is used to send the treated fresh air and / or part of the return air to the room. The return fan is used to draw the air in the room back to the air conditioner for treatment and to discharge part of the return air to the outside of the room through the exhaust valve.

[0008] The air conditioner operation method provided by the present application comprises:

[0009] The temperature value and the humidity value in the room are obtained, and the indoor enthalpy value H1 is calculated according to the temperature value and the humidity value;

[0010] obtain a temperature value and a humidity value outside the room, and calculate an outdoor enthalpy value H2 according to the temperature value and the humidity value;

[0011] calculate a difference AH1 between the indoor enthalpy value H1 and the target enthalpy value H, and a difference AH2 between the outdoor enthalpy value H2 and the target enthalpy value H;

[0012] when the absolute value of AH1 is greater than or equal to a preset value, determine whether a product of AH1 and AH2 is less than or equal to 0;

[0013] when AH1*AH2≤0, start a return air fan, and adjust an opening degree of a fresh air valve to a first opening degree;

[0014] when AH1*AH2>0, stop the return air fan, and adjust the opening degree of the fresh air valve to a second opening degree, the second opening degree being less than the first opening degree.

[0015] Specifically, when the absolute value of AH1 is greater than or equal to the preset value, it indicates that the difference between the indoor enthalpy value H1 and the target enthalpy value H is large, and at this time, the indoor enthalpy value H1 needs to be adjusted to make it close to the target enthalpy value H.

[0016] If the product of the difference AH1 between the indoor enthalpy value H1 and the target enthalpy value H and the difference AH2 between the outdoor enthalpy value H2 and the target enthalpy value H is less than or equal to 0 (for example, the difference AH1 between the indoor enthalpy value H1 and the target enthalpy value H is a positive value, and the difference AH2 between the outdoor enthalpy value H2 and the target enthalpy value H is a negative value, or the difference AH1 between the indoor enthalpy value H1 and the target enthalpy value H is a negative value, and the difference AH2 between the outdoor enthalpy value H2 and the target enthalpy value H is a positive value), it indicates that the introduction of outdoor air is beneficial to make the indoor enthalpy value H1 close to the target enthalpy value H, and at this time, the opening degree of the fresh air valve is adjusted to the first opening degree in priority, and a large amount of outdoor fresh air is introduced. In the case of introducing a large amount of outdoor fresh air, the return air fan needs to be started to stabilize the indoor air pressure. The return air fan can discharge part of the return air to the outdoor through the exhaust air valve, and send part of the return air to the air conditioner for processing. The supply fan sends the processed return air (i.e. the air flowing from the return air fan to the air conditioner) and the fresh air back to the room together, and then makes the indoor enthalpy value H1 close to the target enthalpy value H.

[0017] If the product of the difference AH1 between the indoor enthalpy value H1 and the target enthalpy value H and the difference AH2 between the outdoor enthalpy value H2 and the target enthalpy value H is greater than 0, it indicates that the introduction of outdoor air is not beneficial to make the indoor enthalpy value H1 close to the target enthalpy value H, and at this time, a large amount of outdoor fresh air does not need to be introduced, and the opening degree of the fresh air valve is adjusted to the second opening degree. At the same time, since a large amount of outdoor fresh air is not introduced at this time, the return air fan does not need to be started to balance the air pressure at this time, and only the return air fan needs to be stopped and the supply fan is used to send the processed fresh air of the air conditioner to the room to make the indoor enthalpy value H1 close to the target enthalpy value H.

[0018] The opening time and the closing time of the return air fan can be intelligently judged according to the detection and operation results, so that the return air fan is controlled to be turned on when needed and turned off when not needed, thereby reducing the air conditioning energy consumption and reducing the operation cost.

[0019] According to another specific embodiment of the present application, the rear end of the return air fan is sequentially provided with an exhaust air section and a fresh air section, wherein the exhaust air section is provided with an exhaust air valve, and the fresh air section is provided with a fresh air valve, and when the absolute value of ΔH1 is greater than or equal to the preset value and ΔH1*ΔH2≤0, the method further comprises:

[0020] increasing the opening degree of the exhaust air valve and determining whether the pressure of the exhaust air section is greater than 0;

[0021] if the pressure of the exhaust air section is greater than 0, maintaining the current frequency of the supply air fan and the current frequency of the return air fan;

[0022] if the pressure of the exhaust air section is less than or equal to 0, increasing the frequency of the return air fan or reducing the frequency of the supply air fan.

[0023] According to another specific embodiment of the present application, downstream of the fresh air section in the flow direction of the air, a surface cooling section, a heating section and a humidifying section are further provided, the surface cooling section is provided with a surface cooling valve, the heating section is provided with a heating valve, and the humidifying section is provided with a humidifying valve, and when the absolute value of ΔH1 is greater than or equal to the preset value and ΔH1*ΔH2>0, the method further comprises:

[0024] adjusting one or more of the surface cooling valve, the heating valve and the humidifying valve to make the indoor enthalpy H1 equal to the target enthalpy H.

[0025] According to another specific embodiment of the present application, adjusting one or more of the surface cooling valve, the heating valve and the humidifying valve to make the indoor enthalpy H1 equal to the target enthalpy H comprises:

[0026] when ΔH1>0, increasing the opening degree of the surface cooling valve to perform refrigeration and / or increasing the opening degree of the humidifying valve to perform dehumidification;

[0027] when ΔH1<0, increasing the opening degree of the heating valve to perform heating and / or increasing the opening degree of the humidifying valve to perform humidification.

[0028] According to another specific embodiment of the present application, when the absolute value of ΔH1 is less than the preset value, the exhaust air valve, the fresh air valve, the surface cooling valve, the heating valve and the humidifying valve all maintain the current state.

[0029] According to another specific embodiment of the present application, the preset value is equal to 1.

[0030] According to another specific embodiment of the present application, the exhaust air section is provided with a pressure sensor for detecting the pressure of the exhaust air section.

[0031] According to another specific embodiment of the present application, the temperature value and the humidity value in the room are obtained by arranging a first temperature sensor and a first humidity sensor in the room, respectively for obtaining the temperature value and the humidity value in the room.

[0032] The temperature value and the humidity value outside the room are obtained by arranging a second temperature sensor and a second humidity sensor outside the room, respectively for obtaining the temperature value and the humidity value outside the room.

[0033] The embodiment of the present application also discloses an air conditioner operated based on the aforementioned air conditioner operating method. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 Fig. 1 shows a structural schematic diagram of an air conditioner in an embodiment of the present application;

[0035] Figure 2 Fig. 2 shows a flow schematic diagram of an air conditioner operating method in an embodiment of the present application.

[0036] Fig. 1 shows a structural schematic diagram of an air conditioner in an embodiment of the present application; DETAILED DESCRIPTION

[0037] The following will describe the embodiments of the present application by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the description. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0038] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0039] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0040] The terms "first", "second", and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0041] In the description of the embodiments, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments can be understood according to the specific circumstances.

[0042] In order to make the purpose, technical scheme and advantages of the application clearer, the embodiments of the application will be further described in detail below with reference to the drawings.

[0043] As shown in Figure 1 The air conditioner in the application is provided with a supply fan 1 and a return fan 2, and an exhaust section 6, a fresh air section 7, a surface cooling section 8, a heating section 9 and a humidifying section 10 are sequentially arranged between the return fan 2 and the supply fan 1. The exhaust section 6 is provided with an exhaust valve 4, the fresh air section 7 is provided with a fresh air valve 3, the surface cooling section 8 is provided with a surface cooling valve 11, the heating section 9 is provided with a heating valve 12, and the heating section 9 is provided with a humidifying valve 13. The fresh air outside the room can enter the air conditioner through the fresh air valve 3, the supply fan 1 is used to send the fresh air processed by the air conditioner and / or part of the return air to the room 5 through the supply air pipe 14, and the return fan 2 is used to suck the air in the room 5 back to the air conditioner for processing and part of the return air is discharged outside the room 5 through the exhaust valve 4.

[0044] As shown in Figure 2 The air conditioner operation method provided by the application comprises:

[0045] Step S1: obtaining the temperature value and the humidity value in the room 5, and calculating the indoor enthalpy value H1 according to the temperature value and the humidity value;

[0046] Step S2: obtaining the temperature value and the humidity value outside the room 5, and calculating the outdoor enthalpy value H2 according to the temperature value and the humidity value;

[0047] Step S3: calculate the difference AH1 between the indoor enthalpy H1 and the target enthalpy H, and the difference AH2 between the outdoor enthalpy H2 and the target enthalpy H;

[0048] Step S4: when the absolute value of AH1 is greater than or equal to a preset value, determine whether the product of AH1 and AH2 is less than or equal to 0.

[0049] If AH1*AH2≤0, turn on the return air fan 2 and adjust the opening degree of the fresh air valve 3 to the first opening degree.

[0050] If AH1*AH2>0, turn off the return air fan 2 and adjust the opening degree of the fresh air valve 3 to the second opening degree, which is less than the first opening degree.

[0051] Specifically, when the absolute value of AH1 is greater than or equal to a preset value, it indicates that the difference between the indoor enthalpy H1 and the target enthalpy H is large, and at this time, the indoor enthalpy H1 needs to be adjusted to make it close to the target enthalpy H. If the product of the difference AH1 between the indoor enthalpy H1 and the target enthalpy H and the difference AH2 between the outdoor enthalpy H2 and the target enthalpy H is less than or equal to 0 (for example, the difference AH1 between the indoor enthalpy H1 and the target enthalpy H is positive, the difference AH2 between the outdoor enthalpy H2 and the target enthalpy H is negative, or the difference AH1 between the indoor enthalpy H1 and the target enthalpy H is negative, the difference AH2 between the outdoor enthalpy H2 and the target enthalpy H is positive, or the difference AH2 between the outdoor enthalpy H2 and the target enthalpy H is 0), it indicates that the introduction of outdoor air is beneficial to make the indoor enthalpy H1 close to the target enthalpy H, and at this time, the opening degree of the fresh air valve 3 is adjusted to the first opening degree to introduce a large amount of outdoor fresh air. In the case of introducing a large amount of outdoor fresh air, the return air fan 2 needs to be turned on to stabilize the indoor air pressure. The return air fan 2 can discharge part of the gas to the outdoor through the exhaust valve 4 and send part of the return air to the air conditioner for processing. The supply fan 1 sends the processed return air (i.e. the air flowing from the return air fan 2 to the air conditioner) and the fresh air back to the room 5, thereby making the indoor enthalpy H1 close to the target enthalpy H.

[0052] If the product of the difference AH1 between the indoor enthalpy H1 and the target enthalpy H and the difference AH2 between the outdoor enthalpy H2 and the target enthalpy H is greater than 0, it indicates that the introduction of outdoor air is not conducive to making the indoor enthalpy H1 close to the target enthalpy H, and at this time, a large amount of outdoor fresh air does not need to be introduced, so the opening degree of the fresh air valve 3 is adjusted to the second opening degree (which is less than the first opening degree). At the same time, since a large amount of outdoor fresh air is not introduced at this time, the return air fan 2 does not need to be turned on to balance the air pressure, and only the return air fan 2 needs to be turned off, and the supply fan 1 is used to send the processed fresh air to the room 5 to make the indoor enthalpy H1 close to the target enthalpy H.

[0053] The above technical solution can intelligently determine the start time and the stop time of the return air fan according to the detection and calculation results, so as to control the return air fan to start when needed and stop when not needed, thereby reducing the energy consumption of the air conditioner and reducing the operation cost.

[0054] The applicant also finds that, when the return air fan 2 is started, in order to successfully discharge part of the return air to the outdoor, the exhaust section 6 needs to be in a positive pressure state. In actual application, in the case that the return air fan 2 is started, the exhaust section 6 fails to form a slight positive pressure, at this time, not only part of the return air is not discharged to the outdoor, but on the contrary, the outdoor air is sucked into the air conditioner cabinet through the supply air fan 1 and is sent to the room 5, finally resulting in that the air pressure in the room 5 is increased, and a large amount of air escapes to the outdoor through the door and window holes of the room 5. In this state, the return air fan 2 only increases the energy consumption of operation, but fails to achieve the purpose of controlling the pressure in the room 5.

[0055] In order to effectively control the pressure in the room, so that the return air fan 2 can play the due role when it is operated, the air conditioner operation method provided by the present application further comprises: when the absolute value of ΔH1 is greater than or equal to the preset value, and ΔH1*ΔH2≤0, increasing the opening degree of the exhaust valve 4, and judging whether the pressure of the exhaust section 6 is greater than 0. If the pressure of the exhaust section 6 is greater than 0, it indicates that the return air fan 2 can successfully discharge part of the return air to the outdoor, therefore, at this time, it is only needed to keep the current frequency of the supply air fan 1 and the frequency of the return air fan 2 unchanged. If the pressure of the exhaust section 6 is less than or equal to 0, it indicates that, at this time, although the return air fan 2 is operated, actually, part of the return air is not successfully discharged to the outdoor, therefore, more air can be gathered at the exhaust section 6 by increasing the frequency of the return air fan 2, so that the exhaust section 6 is in a positive pressure state, thereby successfully discharging part of the return air to the outdoor. Alternatively, the frequency of the supply air fan 1 can be reduced, so that more air is gathered at the exhaust section 6, so that the exhaust section 6 is in a positive pressure state, thereby successfully discharging part of the return air to the outdoor, to effectively control the pressure in the room. Specifically, the exhaust section 6 is provided with a pressure sensor 16, which can detect the pressure of the exhaust section 6. Since the opening degree of the fresh air valve 3 is adjusted to the first opening degree, a large amount of outdoor fresh air is introduced, which can cause the pressure in the room to instantaneously increase, therefore, increasing the opening degree of the exhaust valve 4 can reduce the pressure in the room to a certain extent.

[0056] According to another specific embodiment of the present application, when the absolute value of ΔH1 is greater than or equal to the preset value, and ΔH1*ΔH2>0, it indicates that, at this time, the introduction of the outdoor fresh air is not conducive to making the indoor enthalpy H1 close to the target enthalpy H. Therefore, in addition to closing the return air fan 2 and adjusting the opening degree of the fresh air valve 3 to the second opening degree, one or more of the cooling valve 11, the heating valve 12 and the humidifying valve 13 also need to be adjusted, so that the indoor enthalpy H1 is equal to the target enthalpy H.

[0057] Specifically, when ΔH1> 0, it indicates that the indoor enthalpy H1 is higher than the target enthalpy H, at this time, the opening of the cooling valve 11 is increased to perform cooling and / or the opening of the humidifying valve 13 is increased to perform dehumidification, so that the indoor enthalpy H1 is equal to the target enthalpy H. When ΔH1< 0, it indicates that the indoor enthalpy H1 is higher than the target enthalpy H, at this time, the opening of the heating valve 12 is increased to perform heating and / or the opening of the humidifying valve 13 is increased to perform humidification, so that the indoor enthalpy H1 is equal to the target enthalpy H.

[0058] According to another specific embodiment of the present application, when the absolute value of ΔH1 is less than the preset value, it indicates that the difference ΔH1 between the indoor enthalpy H1 and the target enthalpy H is within the allowable range, thus no adjustment is needed, and the exhaust valve 4, the fresh air valve 3, the cooling valve 11, the heating valve 12 and the humidifying valve 13 all maintain the current state.

[0059] Those skilled in the art can understand that the preset value can be set according to actual conditions. Preferably, the preset value is equal to 1.

[0060] According to another specific embodiment of the present application, the room 5 is provided with a first temperature sensor and a first humidity sensor, which are used to obtain the temperature value and the humidity value in the room 5 respectively, and calculate the indoor enthalpy H1 based on the temperature value and the humidity value. The room 5 is provided with a second temperature sensor and a second humidity sensor, which are used to obtain the temperature value and the humidity value outside the room 5 respectively, and calculate the outdoor enthalpy H2 based on the temperature value and the humidity value.

[0061] The air conditioning operation method provided by the present application is described in detail below in combination with three embodiments.

[0062] Embodiment one

[0063] It is assumed that the target enthalpy H is 26 and the preset value is 1. When the indoor enthalpy H1 is 24 and the outdoor enthalpy H2 is 29, the difference ΔH1 between the indoor enthalpy H1 and the target enthalpy H is equal to -2, the absolute value of which is 2, which is greater than the preset value 1, and the difference ΔH2 between the outdoor enthalpy H2 and the target enthalpy H is equal to 3, and the product of -2 and 3 is less than or equal to 0. At this time, the outdoor fresh air is beneficial to make the indoor enthalpy H1 close to the target enthalpy H, thus the opening of the fresh air valve 3 is adjusted to the first opening, the return air fan 2 is started, and the opening of the exhaust valve 4 is increased. Then it is judged whether the pressure of the exhaust section 6 is greater than 0, if the pressure of the exhaust section 6 is greater than 0, it indicates that the return air fan 2 can successfully exhaust part of the return air to the outdoor, at this time, it is only needed to keep the current frequency of the supply air fan 1 and the frequency of the return air fan 2 unchanged. If the pressure of the exhaust section 6 is less than or equal to 0, the frequency of the return air fan 2 is increased or the frequency of the supply air fan 1 is decreased, so that the exhaust section 6 is in a positive pressure state.

[0064] Embodiment two

[0065] Suppose the target enthalpy value H is 26, and the preset value is 1. When the indoor enthalpy value H1 is 29 and the outdoor enthalpy value H2 is 30, the difference ΔH1 between the indoor enthalpy value H1 and the target enthalpy value H is equal to 3, the absolute value of which is 3, which is greater than the preset value 1, and the difference ΔH2 between the outdoor enthalpy value H2 and the target enthalpy value H is equal to 4, and the product of 3 and 4 is greater than 0. At this time, the outdoor fresh air is not conducive to making the indoor enthalpy value H1 approach the target enthalpy value H. Therefore, the return air fan 2 is closed, and the opening degree of the fresh air valve 3 is adjusted to the second opening degree. Since the indoor enthalpy value H1 is 29, which is higher than 26, at this time, the opening degree of the surface cooling valve 11 is increased to perform refrigeration and / or the opening degree of the humidification valve 13 is increased to perform dehumidification, so that the indoor enthalpy value H1 is equal to 26.

[0066] Embodiment Three

[0067] Suppose the target enthalpy value H is 26, and the preset value is 1. When the indoor enthalpy value H1 is 25.5, the difference ΔH1 between the indoor enthalpy value H1 and the target enthalpy value H is equal to 0.5, which is less than the preset value 1, that is, the difference between the indoor enthalpy value H1 and the target enthalpy value H is within a reasonable range, so at this time, the exhaust air valve 4, the fresh air valve 3, the surface cooling valve 11, the heating valve 12 and the humidification valve 13 all maintain the current state.

[0068] The embodiment of the present application also discloses an air conditioner based on the air conditioner operation method.

[0069] As shown in Figure 1 The embodiment of the present application also discloses an air conditioner based on the air conditioner operation method.

[0070] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further explanation of the present application in connection with the specific embodiments, and is not intended to limit the present application to the specific embodiments. Various changes in form and details can be made by those skilled in the art without departing from the spirit and scope of the present application.

Claims

1. An air conditioning operation method, wherein, The air conditioner is provided with a supply fan, a return fan, a fresh air valve and an exhaust valve. Fresh air from outside can enter the air conditioner through the fresh air valve. The supply fan is used to send the fresh air and / or part of the return air processed by the air conditioner into a room. The return fan is used to draw air in the room back to the air conditioner for processing and to discharge part of the return air outside the room through the exhaust valve. The air conditioner operation method comprises the following steps: Obtain the temperature and humidity values in the room, and calculate the indoor enthalpy value H1 according to the temperature and humidity values; Obtain the temperature and humidity values outside the room, and calculate the outdoor enthalpy value H2 according to the temperature and humidity values; Calculate the difference ΔH1 between the indoor enthalpy value H1 and the target enthalpy value H, and the difference ΔH2 between the outdoor enthalpy value H2 and the target enthalpy value H; When the absolute value of ΔH1 is greater than or equal to a preset value, determine whether the product of ΔH1 and ΔH2 is less than or equal to 0; When ΔH1*ΔH2≤0, turn on the return fan and adjust the opening degree of the fresh air valve to a first opening degree; When ΔH1*ΔH2>0, turn off the return fan and adjust the opening degree of the fresh air valve to a second opening degree, which is smaller than the first opening degree.

2. The air conditioning operation method of claim 1, wherein, The rear end of the return fan is sequentially provided with an exhaust section and a fresh air section. The exhaust section is provided with the exhaust valve, and the fresh air section is provided with the fresh air valve. When the absolute value of ΔH1 is greater than or equal to the preset value and ΔH1*ΔH2≤0, the method further comprises the following steps: Increase the opening degree of the exhaust valve and determine whether the pressure of the exhaust section is greater than 0; If the pressure of the exhaust section is greater than 0, maintain the current frequency of the supply fan and the current frequency of the return fan; If the pressure of the exhaust section is less than or equal to 0, increase the frequency of the return fan or decrease the frequency of the supply fan.

3. The air conditioning operation method of claim 2, wherein, Downstream of the fresh air section in the flow direction of the air, a surface cooling section, a heating section and a humidifying section are further provided. The surface cooling section is provided with a surface cooling valve, the heating section is provided with a heating valve, and the humidifying section is provided with a humidifying valve. When the absolute value of ΔH1 is greater than or equal to the preset value and ΔH1*ΔH2>0, the method further comprises the following steps: Adjust one or more of the surface cooling valve, the heating valve and the humidifying valve to make the indoor enthalpy value H1 equal to the target enthalpy value H.

4. The air conditioning operation method of claim 3, wherein, The adjustment of one or more of the surface cooling valve, the heating valve and the humidifying valve to make the indoor enthalpy value H1 equal to the target enthalpy value H comprises the following steps: When ΔH1>0, increase the opening degree of the surface cooling valve for refrigeration and / or increase the opening degree of the humidifying valve for dehumidification; When ΔH1<0, increase the opening degree of the heating valve for heating and / or increase the opening degree of the humidifying valve for humidification.

5. The air conditioning operation method of claim 3, wherein, When the absolute value of ΔH1 is less than the preset value, the exhaust valve, the fresh air valve, the surface cooling valve, the heating valve and the humidifying valve all maintain the current state.

6. The air-conditioning operation method according to any one of claims 1 to 5, wherein The preset value is equal to 1.

7. The air conditioning operation method according to claim 2, wherein The exhaust section is provided with a pressure sensor for detecting the pressure of the exhaust section.

8. The air conditioning operation method of claim 1, wherein, The obtaining of the temperature value and the humidity value in the room comprises that a first temperature sensor and a first humidity sensor are arranged in the room to obtain the temperature value and the humidity value in the room, respectively. The obtaining of the temperature value and the humidity value outside the room comprises that a second temperature sensor and a second humidity sensor are arranged outside the room to obtain the temperature value and the humidity value outside the room, respectively.

9. An air conditioner characterized by comprising: An air conditioner is operated by the operation method of any one of claims 1 to 8.

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