A control method of a fresh air conditioner and the fresh air conditioner

Abstract

The application discloses a kind of control method and fresh air conditioning of fresh air.The method comprises: when fresh air device operates, the fresh air temperature at fresh air outlet, the indoor air outlet temperature at indoor air outlet and the indoor set temperature are obtained;According to fresh air temperature, indoor air outlet temperature and indoor set temperature, determine indoor temperature correction value;According to indoor temperature correction value, the operating parameters of fresh air conditioning are regulated and controlled.The application determines indoor temperature correction value by fresh air temperature, indoor air outlet temperature and indoor set temperature, regulates and controls the operating parameters of air conditioner according to indoor temperature correction value, to cause the room temperature change of the corresponding regulation and control of the introduction of fresh air from outdoor, accurate temperature control, improve the comfort and quality of fresh air conditioning user.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly to a control method of a fresh air conditioner and the fresh air conditioner. BACKGROUND

[0002] The fresh air device of the air conditioner can introduce fresh air from the outdoor to the indoor to replace the fresh air and blow the fresh air. However, in summer or winter, when the temperature difference between the indoor and outdoor is large, the hot air or cold air directly introduced into the indoor will also cause a large local air temperature difference, which is easy to cause the discomfort of the human body and reduces the comfort of the user of the fresh air conditioner. SUMMARY

[0003] In view of this, the present application discloses a control method of a fresh air conditioner and the fresh air conditioner, which is used to solve the problem of the change of the room temperature caused by the introduction of fresh air from the outdoor in the existing fresh air conditioner, and reduces the comfort of the user of the fresh air conditioner.

[0004] In order to achieve the above-mentioned target, the technical scheme adopted by the present application is as follows:

[0005] The first aspect of the present application discloses a control method of a fresh air conditioner, the indoor unit of the fresh air conditioner includes an indoor unit main body and a fresh air device, the fresh air device is provided with a fresh air air duct and a corresponding fresh air outlet, the indoor unit main body is formed with a heat exchange air duct and a corresponding indoor outlet, the fresh air air duct and the heat exchange air duct are independent of each other, and the method comprises the following steps:

[0006] When the fresh air device is running, the fresh air temperature at the fresh air outlet, the indoor air outlet temperature at the indoor outlet, and the indoor set temperature are obtained;

[0007] The indoor temperature correction value is determined according to the fresh air temperature, the indoor air outlet temperature, and the indoor set temperature;

[0008] The operating parameters of the fresh air conditioner are regulated and controlled according to the indoor temperature correction value.

[0009] Further, the indoor temperature correction value is determined according to the fresh air temperature, the indoor air outlet temperature, and the indoor set temperature, which comprises the following steps:

[0010] The difference between the indoor set temperature and the fresh air temperature is calculated;

[0011] The difference between the indoor set temperature and the indoor air outlet temperature is calculated;

[0012] The indoor temperature correction value is determined according to the difference between the indoor set temperature and the fresh air temperature and the difference between the indoor set temperature and the indoor air outlet temperature.

[0013] Further, the indoor temperature correction value is calculated by using the following formula:

[0014]

[0015] wherein, ΔT 修正 represents the indoor temperature correction value, ΔT 新 represents the absolute value of the difference between the indoor set temperature and the fresh air temperature, ΔT 换内 represents the absolute value of the difference between the indoor set temperature and the indoor air outlet temperature, a is a coefficient, and a>1.

[0016] Further optionally, the fresh air conditioner is further provided with an outdoor unit, the outdoor unit comprises an outdoor fan, the fresh air device is provided with a fresh air fan, and the indoor unit body is provided with an indoor fan; the operating parameters comprise the rotating speed of the outdoor fan and / or the rotating speed of the fresh air fan and / or the rotating speed of the indoor fan.

[0017] Further optionally, the operating parameters comprise the rotating speed of the outdoor fan and the rotating speed of the fresh air fan, and the operating parameters of the fresh air conditioner are controlled according to the indoor temperature correction value, comprising:

[0018] comparing the indoor temperature correction value with a preset value;

[0019] controlling the rotating speed of the outdoor fan and the rotating speed of the fresh air fan according to the comparison result.

[0020] Further optionally, the preset value comprises a first preset value and a second preset value, and the rotating speed of the outdoor fan and the rotating speed of the fresh air fan are controlled according to the comparison result, comprising:

[0021] when ΔT 修正 < ΔT1, the outdoor fan is controlled to operate at V 外1 , and the fresh air fan is controlled to operate at V 新1 ;

[0022] when ΔT1≤ ΔT 修正 < ΔT2, the outdoor fan is controlled to operate at V 外2 , and the fresh air fan is controlled to operate at V 新2 ;

[0023] when ΔT 修正 ≥ ΔT2, the outdoor fan is controlled to operate at V 外2 , and the fresh air fan is controlled to operate at V 新2 ;

[0024] wherein, ΔT1 represents the first preset value, ΔT2 represents the second preset value, 0<ΔT1<ΔT2, V 外1 < V 外2 < V 外3 , V 新1 > V 新2 > V 新3 .

[0025] Further optionally, the fresh air conditioner is provided with a supply air mode, and the method further comprises:

[0026] monitoring whether the indoor environment temperature reaches the indoor set temperature;

[0027] When the indoor environment temperature reaches the indoor set temperature, the outdoor fan and the fresh air device are both controlled to stop running, and the fresh air conditioner is controlled to stop the current operation mode and switch to the air supply mode.

[0028] Further, the operation parameter further includes the indoor fan speed, the current operation mode includes the cooling mode and the heating mode, and after the fresh air conditioner stops the current operation mode and switches to the air supply mode, the indoor fan speed remains unchanged.

[0029] The second aspect of the present application discloses a fresh air conditioner, and the indoor unit of the fresh air conditioner includes an indoor unit main body and a fresh air device, the fresh air device is provided with a fresh air air duct and a corresponding fresh air outlet, a heat exchange air duct and a corresponding indoor outlet are formed in the indoor unit main body, the fresh air air duct and the heat exchange air duct are independent of each other, and the fresh air conditioner adopts the method according to any one of the first aspect.

[0030] Further, the fresh air device is arranged in the indoor unit main body, and the fresh air outlet and the indoor outlet are both provided with a temperature sensor.

[0031] Beneficial effects: The indoor temperature correction value is determined by the fresh air temperature, the indoor outlet temperature and the indoor set temperature, the operation parameter of the air conditioner is adjusted according to the indoor temperature correction value, the room temperature change caused by the introduction of fresh air from the outdoor is adjusted, the temperature is accurately controlled, and the comfort and quality of the fresh air conditioner user are improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, in which:

[0033] Figure 1 An example of a structure diagram of a fresh air conditioner according to an embodiment of the present application is shown.

[0034] Figure 2 An example of a flow diagram of a control method of a fresh air conditioner according to an embodiment of the present application is shown.

[0035] Figure 3 An example of a flow diagram of a control method of a fresh air conditioner according to an embodiment of the present application is shown.

[0036] Figure 4 An example of a flow diagram of a control method of a fresh air conditioner according to an embodiment of the present application is shown.

[0037] Wherein: 10 - fresh air outlet, 11 - indoor air outlet, 12 - temperature sensor. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] The terms used in the embodiments of the present application are only for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0040] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0041] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that the product or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such product or system. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the product or system including the element.

[0042] To solve the problem that the room temperature changes caused by introducing fresh air from the outdoor in the existing fresh air conditioner, reducing the user comfort of the fresh air conditioner, the first aspect of the present embodiment discloses a control method of a fresh air conditioner, which combines Figure 1The indoor unit of the fresh air conditioner comprises an indoor unit main body and a fresh air device. The fresh air device is provided with a fresh air air duct and a corresponding fresh air outlet 10. The indoor unit main body is formed with a heat exchange air duct and a corresponding indoor air outlet 11. The fresh air air duct and the heat exchange air duct are independent of each other. In this embodiment, the fresh air device is preferably arranged in the indoor unit main body. The fresh air outlet 10 and the indoor air outlet 11 are both provided with temperature sensors 12. The temperature sensor at the fresh air outlet measures the temperature T of the fresh air introduced into the room in real time 新 The temperature sensor at the indoor air outlet measures the temperature T of the indoor air blown out by the air conditioner after heat exchange in real time 换内 .

[0043] In combination Figure 2 , the method comprises S1-S3, wherein:

[0044] S1, when the fresh air device is running, obtaining the fresh air temperature T at the fresh air outlet, the indoor air outlet temperature T at the indoor air outlet, and the indoor set temperature T 新 ; 换内 设 ;

[0045] S2, determining an indoor temperature correction value according to the fresh air temperature T 新 , the indoor air outlet temperature T 换内 , and the indoor set temperature T 设 ;

[0046] S3, adjusting the operation parameters of the fresh air conditioner according to the indoor temperature correction value.

[0047] This embodiment determines the indoor temperature correction value according to the fresh air temperature T 新 , the indoor air outlet temperature T 换内 , and the indoor set temperature T 设 , adjusts the operation parameters of the air conditioner according to the indoor temperature correction value, and adjusts the room temperature change caused by the introduction of fresh air from the outdoor. The temperature is accurately controlled, and the comfort and quality of the fresh air conditioner user are improved.

[0048] Optionally, S2 comprises the following steps:

[0049] S21, calculating the difference between the indoor set temperature T 设 and the fresh air temperature T 新 ;

[0050] S22, calculating the difference between the indoor set temperature T 设 and the indoor air outlet temperature T 换内 ;

[0051] S23, according to the difference between the indoor set temperature T 设 and the fresh air temperature T 新 , and the difference between the indoor set temperature T 设 ​The difference between the indoor temperature T 换内 and the outdoor air temperature T 设 determines the indoor temperature correction value.

[0052] In the embodiment, the difference between the indoor set temperature T 新 and the outdoor air temperature T 设 and the difference between the indoor set temperature T 换内 and the indoor air temperature T 修正 are calculated, the indoor temperature correction value is determined according to the two differences, and the operation parameter of the fresh air conditioner is regulated, so that the room temperature change caused by the introduction of the outdoor fresh air is regulated, the temperature is accurately controlled, and the user has a more comfortable experience.

[0053] Optionally, the indoor temperature correction value is calculated by the following formula:

[0054]

[0055] wherein, ΔT 修正 represents the indoor temperature correction value, ΔT 新 represents the absolute value of the difference between the indoor set temperature and the outdoor air temperature, ΔT 换内 represents the absolute value of the difference between the indoor set temperature and the indoor air temperature, and a is a coefficient, a>1.

[0056] wherein, a>1, a can be 1.5, 2, 2.5, etc., and in a specific embodiment of the present application, a is 2.

[0057] Optionally, the fresh air conditioner further comprises an outdoor unit, the outdoor unit comprises an outdoor fan, the fresh air device comprises a fresh air fan, and the indoor unit body comprises an indoor fan; the operation parameter comprises the rotation speed of the outdoor fan and / or the rotation speed of the fresh air fan and / or the rotation speed of the indoor fan, but is not limited thereto.

[0058] The embodiment adjusts the rotation speed of the outdoor fan and / or the rotation speed of the fresh air fan and / or the rotation speed of the indoor fan to regulate the room temperature change caused by the introduction of the outdoor fresh air, accurately controls the temperature, and improves the comfort and quality of the fresh air conditioner user.

[0059] Optionally, the operation parameter comprises the rotation speed of the outdoor fan and the rotation speed of the fresh air fan, and S3 comprises the following steps:

[0060] S31, comparing the indoor temperature correction value ΔT 修正 with a preset value ΔT 外 ;

[0061] S31, controlling the rotation speed V 外 of the outdoor fan and the rotation speed V 新 of the fresh air fan according to the comparison result.

[0062] The embodiment compares the indoor temperature correction value ΔT 修正determining the rotating speed V of the outdoor fan according to the size of the preset value ΔT 外 and the rotating speed V of the fresh air fan 新 The preset value ΔT can be one preset value or multiple different preset values.

[0063] Preferably, the preset value ΔT includes a first preset value ΔT1 and a second preset value ΔT2, and S31 includes the following steps:

[0064] S311, when ΔT 修正 < ΔT1, controlling the outdoor fan to run at V 外1 and the fresh air fan to run at V 新1 ;

[0065] When ΔT 修正 < ΔT1, the air conditioner main control system controls the outdoor fan to run at V 外1 and the fresh air fan to run at V 新1 , and after the air conditioner runs to the target set temperature T 设 , the outdoor fan stops running, the fresh air device is closed and stops running, the air conditioner stops the current running mode, switches to the air supply mode, and the indoor fan continues to run at V 内 ;

[0066] S312, when ΔT1≤ΔT 修正 < ΔT2, controlling the outdoor fan to run at V 外2 and the fresh air fan to run at V 新2 ;

[0067] When ΔT1≤ΔT 修正 < ΔT2, the air conditioner main control system controls the outdoor fan to run at V 外2 and the fresh air fan to run at V 新2 , and after the air conditioner runs to the target set temperature T 设 , the outdoor fan stops running, the fresh air device is closed and stops running, the air conditioner stops the current running mode, switches to the air supply mode, and the indoor fan continues to run at V 内 ;

[0068] S313, when ΔT 修正 ≥ΔT2, controlling the outdoor fan to run at V 外2 and the fresh air fan to run at V 新2 ;

[0069] When ΔT 修正 ≥ΔT2, the air conditioner main control system controls the outdoor fan to run at V 外3 and the fresh air fan to run at V 新 3, and after the air conditioner runs to the target set temperature T 设Afterwards, the outdoor fan stops running, the fresh air device stops running, and the air conditioner stops the current running mode and switches to the air supply mode, the indoor fan continues to run at V 内 ;

[0070] Wherein, 0 < ΔT1 < ΔT2, V 外1 ; 外2 ; 外3 ; 新1 ; 新2 ; 新3 ;

[0071] When the temperature difference correction value is small, the outdoor fan does not need too large a rotating speed to quickly exchange heat with indoor air, and at this time, it is appropriate to introduce more fresh air, which will not cause too large a local temperature difference, so the size order of the rotating speed value is: V 外1 ; 外2 ; 外3 ; 新1 ; 新2 ; 新3 .

[0072] Further, the fresh air conditioner is provided with an air supply mode, and the method further comprises S4-S5, wherein:

[0073] S4, monitoring whether the indoor environment temperature reaches the indoor set temperature;

[0074] Specifically, the air conditioner is provided with a main control system; the air conditioner main control system controls the air conditioner on-off, the air conditioner running mode, the rotating speed of the indoor and outdoor fans, the on-off of the fresh air device, and the rotating speed of the fresh air fan; the indoor unit of the fresh air conditioner is provided with an indoor temperature sensing bag, which detects the indoor environment temperature in real time or once every certain time interval; the air conditioner main control system compares the indoor environment temperature with the indoor set temperature, thereby monitoring whether the indoor environment temperature reaches the indoor set temperature;

[0075] S5, when the indoor environment temperature reaches the indoor set temperature, the outdoor fan and the fresh air device are both controlled to stop running, and the fresh air conditioner is controlled to stop the current running mode and switch to the air supply mode.

[0076] Specifically, the value of ΔT 修正 is compared with the preset value ΔT to determine the rotating speed V 外 of the outdoor fan and the rotating speed V 新 of the fresh air fan, and the air conditioner is run at V 外 and V 新 ; whether the indoor environment temperature reaches the target set temperature T 设 is monitored, and after the target set temperature T 设 is reached, if the cooling or heating mode continues to be turned on, the outdoor fan runs at an extremely low rotating speed, which wastes resources; therefore, in this embodiment, when the air conditioner runs to the target set temperature T设 Then, the air conditioning main control system stops the outdoor fan, shuts down the fresh air unit, and the air conditioner stops its current operating mode and switches to supply air mode. In supply air mode, the air conditioner stops its current operating mode, the outdoor fan stops working, and only the indoor fan continues to supply air to maintain the current indoor temperature, thus saving energy.

[0077] Further optional operating parameters include indoor fan speed, current operating mode including cooling mode and heating mode, and indoor fan speed remaining unchanged after the fresh air conditioner stops the current operating mode and switches to air supply mode.

[0078] Combination Figure 1 , Figure 3 , Figure 4 This embodiment will be described in further detail as follows:

[0079] The indoor unit of the air conditioner is equipped with a fresh air system; the air conditioner has a main control system that controls the air conditioner's on / off status, operating mode, indoor and outdoor fan speeds, fresh air system on / off status, and fresh air fan speed; the fresh air system has an air outlet with a temperature sensor at the outlet; the indoor unit of the air conditioner also has an air outlet with a temperature sensor at the outlet; the temperature sensor at the fresh air outlet measures the real-time temperature T of the incoming fresh air. 新 The temperature sensor at the indoor unit's air outlet measures the real-time temperature (T) of the indoor air blown out by the air conditioner after heat exchange. 换内 ;

[0080] Get the current target set temperature T 设 Calculate T 设 With T 新 The absolute value of the difference △T 新 =|T 设 -T 新 |, calculate T 设 With T 换内 The absolute value of the difference △T 换内 =|T 设 -T 换内 |;

[0081] Correction value for calculating temperature difference

[0082] Compare △T 修正 The value of V is compared with the preset value △T to determine the rotational speed V of the external fan. 外 With respect to the rotational speed V of the fresh air fan 新 ;

[0083] The air conditioner runs until the target set temperature T 设 Afterwards, the air conditioning main control system controls the outdoor fan to stop operating, the fresh air unit to shut down and stop running, the air conditioner to stop its current operating mode and switch to air supply mode, and the indoor fan operates at V...内 The rotation speed of the air supply continues to run.

[0084] Specifically,

[0085] When △T 修正 < △T1, the air conditioning main control system controls the external fan to run at a rotation speed of V 外1 , the fresh air fan to run at a rotation speed of V 新1 , and the air conditioner to run to a target setting temperature T 设 . After the air conditioner runs to the target setting temperature T 内 , the external fan stops running, the fresh air device is closed and stops running, the air conditioner stops the current running mode, and the air supply mode is switched to the internal fan running at a rotation speed of V

[0086] When △T1≤△T 修正 < △T2, the air conditioning main control system controls the external fan to run at a rotation speed of V 外2 , the fresh air fan to run at a rotation speed of V 新2 , and the air conditioner to run to a target setting temperature T 设 . After the air conditioner runs to the target setting temperature T 内 , the external fan stops running, the fresh air device is closed and stops running, the air conditioner stops the current running mode, and the air supply mode is switched to the internal fan running at a rotation speed of V

[0087] When △T 修正 ≥△T2, the air conditioning main control system controls the external fan to run at a rotation speed of V 外3 , the fresh air fan to run at a rotation speed of V 新3 , and the air conditioner to run to a target setting temperature T 设 . After the air conditioner runs to the target setting temperature T 内 , the external fan stops running, the fresh air device is closed and stops running, the air conditioner stops the current running mode, and the air supply mode is switched to the internal fan running at a rotation speed of V

[0088] Wherein 0<△T1<△T2; V 外1 < V 外2 < V 外3 , V 新1 > V 新2 > V 新3 ; the rotation speed of the internal fan is the same after the air conditioner stops the current running mode and switches to the air supply mode.

[0089] The second aspect of the embodiment discloses a fresh air conditioner. The indoor unit of the fresh air conditioner comprises an indoor unit main body and a fresh air device. The fresh air device is provided with a fresh air air duct and a corresponding fresh air outlet. A heat exchange air duct and a corresponding indoor air outlet are formed in the indoor unit main body. The fresh air air duct and the heat exchange air duct are independent of each other. The fresh air conditioner adopts the method provided in any one of the preceding embodiments.

[0090] Optionally, the fresh air device is arranged in the indoor unit main body. The fresh air outlet and the indoor air outlet are both provided with temperature sensors.

[0091] In different embodiments provided by the present application, the same parameters, terms, logics, etc. should be understood as having the same meaning, and the present application does not deliberately repeat the description in each embodiment.

[0092] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structure, arrangement or implementation method described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements within the spirit and scope of the appended claims.

Claims

1. A method for controlling a fresh air conditioning system, characterized in that, The indoor unit of the fresh air conditioner includes an indoor unit body and a fresh air device. The fresh air device has a fresh air duct and a corresponding fresh air outlet. The indoor unit body forms a heat exchange duct and a corresponding indoor air outlet. The fresh air duct and the heat exchange duct are independent of each other. The fresh air conditioner also includes an outdoor unit, which includes an outdoor fan. The fresh air device has a fresh air fan. The operating parameters include the speed of the outdoor fan and the speed of the fresh air fan. The method includes: When the fresh air device is running, the fresh air temperature at the fresh air outlet, the indoor air temperature at the indoor air outlet, and the indoor set temperature are obtained. The indoor temperature correction value is determined based on the fresh air temperature, the indoor air outlet temperature, and the indoor set temperature. The operating parameters of the fresh air conditioner are adjusted according to the indoor temperature correction value; The step of determining the indoor temperature correction value based on the fresh air temperature, the indoor air outlet temperature, and the indoor set temperature includes: Calculate the difference between the indoor set temperature and the fresh air temperature; Calculate the difference between the indoor set temperature and the indoor air outlet temperature; The indoor temperature correction value is determined based on the difference between the indoor set temperature and the fresh air temperature and the difference between the indoor set temperature and the indoor outlet air temperature. The step of determining the indoor temperature correction value based on the difference between the indoor set temperature and the fresh air temperature, and the difference between the indoor set temperature and the indoor outlet air temperature, includes: The indoor temperature correction value is calculated using the following formula: Where, ΔT 修正 This represents the indoor temperature correction value, ΔT. 新 ΔT represents the absolute value of the difference between the indoor set temperature and the fresh air temperature. 换内 This represents the absolute value of the difference between the indoor set temperature and the indoor air outlet temperature, where a is a coefficient and a > 1; The step of adjusting the operating parameters of the fresh air conditioner according to the indoor temperature correction value includes: The indoor temperature correction value is compared with the preset value; The speed of the outdoor fan and the speed of the fresh air fan are controlled based on the comparison results. The preset values ​​include a first preset value and a second preset value. Controlling the speed of the outdoor fan and the fresh air fan based on the comparison result includes: In ΔT 修正 When <ΔT1, control the outdoor fan to V 外1 Fresh air fan with V 新1 Operating at [speed]; When ΔT1≤ΔT 修正 When <ΔT2, control the outdoor fan to V 外2 Fresh air fan with V 新2 Operating at [speed]; In ΔT 修正 When ≥ΔT2, control the outdoor fan to V 外2 Fresh air fan with V 新2 Operating at [speed]; Where ΔT1 represents the first preset value, ΔT2 represents the second preset value, 0 < ΔT1 < ΔT2, V 外1 <V 外2 <V 外3 V 新1 >V 新2 >V 新3 .

2. The method as described in claim 1, characterized in that, The fresh air conditioner has an air supply mode, and the method further includes: Monitor whether the indoor ambient temperature has reached the set indoor temperature; When the indoor ambient temperature reaches the set indoor temperature, the outdoor fan and the fresh air device are both controlled to stop operating, and the fresh air air conditioner is controlled to stop its current operating mode and switch to the air supply mode.

3. The method as described in claim 2, characterized in that, The indoor unit is equipped with an indoor fan. The operating parameters also include the indoor fan speed. The current operating mode includes cooling mode and heating mode. After the fresh air conditioner stops the current operating mode and switches to the air supply mode, the indoor fan speed remains unchanged.

4. A fresh air conditioning system, characterized in that, The indoor unit of the fresh air conditioner includes an indoor unit body and a fresh air device. The fresh air device is provided with a fresh air duct and a corresponding fresh air outlet. A heat exchange duct and a corresponding indoor air outlet are formed inside the indoor unit body. The fresh air duct and the heat exchange duct are independent of each other. The fresh air conditioner adopts the method as described in any one of claims 1-3.

5. The fresh air conditioner as described in claim 4, characterized in that, The fresh air device is located inside the indoor unit, and both the fresh air outlet and the indoor air outlet are equipped with temperature sensors.

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