Dehumidification control method and air conditioning system

Abstract

The application provides a dehumidification control method and an air conditioning system. In the scheme, for the air conditioning system with a fresh air function, the real-time indoor humidity RH0 and the real-time outdoor humidity RH are detected every interval time during the dehumidification operation of the indoor environment, the difference between the real-time indoor humidity RH0 and the real-time outdoor humidity RH is compared with a set difference RH1, and then the opening degree of the fresh air outlet and the return air outlet is adjusted according to the comparison result, so as to switch the dehumidification mode of the air conditioning system. That is, the humidity factor of the fresh air introduced from the outdoor is considered during the dehumidification operation, the outdoor humidity and the indoor humidity are comprehensively considered, the opening degree of the fresh air outlet and the return air outlet is adjusted according to the humidity condition, the proportion of the fresh air and the return air entering the mixing cavity is actively adjusted, so that the air humidity in the mixing cavity will not be too high, and then the dehumidification is carried out through the heat exchange pipe, thereby the dehumidification effect can be improved and the system energy consumption can be reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and more specifically, to a dehumidification control method and an air conditioning system. Background Technology

[0002] Some air conditioning systems, such as fan coil units, can dehumidify indoor air to prevent excessive humidity from affecting user comfort. Current dehumidification methods, when detecting high indoor humidity, utilize the low-temperature refrigerant in the air conditioning system's heat exchange tubes to exchange heat with the indoor return air, causing water vapor in the air to condense into water, thereby reducing humidity. For some air conditioning systems with fresh air intake functions, the fresh air introduced from outdoors affects indoor humidity; however, current dehumidification methods do not take this factor into account, leading to poor dehumidification performance and high system energy consumption in some cases. Summary of the Invention

[0003] This invention provides a dehumidification control method and an air conditioning system to solve the problems of poor dehumidification effect and high energy consumption in existing air conditioning systems with fresh air function.

[0004] To address the aforementioned problems, according to one aspect of the present invention, a dehumidification control method is provided for controlling an air conditioning system, the air conditioning system having a mixing chamber and a fresh air inlet for introducing outdoor fresh air into the mixing chamber and a return air inlet for introducing indoor return air into the mixing chamber, the dehumidification control method comprising:

[0005] S10. At each first set time interval, detect the indoor real-time humidity RH0 and the outdoor real-time humidity RH, calculate the difference between the indoor real-time humidity RH0 and the outdoor real-time humidity RH, and compare the calculated difference with the set difference △RH1.

[0006] S20. Adjust the opening of the fresh air inlet and the return air inlet according to the comparison results to switch the dehumidification mode of the air conditioning system.

[0007] Furthermore, S20 includes:

[0008] When -△RH1≤RH0-RH≤0, both the return air vent and the fresh air vent are opened, and the opening degree of the return air vent is adjusted to be greater than the opening degree of the fresh air vent, so as to switch the air conditioning system to mixed return air mode one.

[0009] When 0 < RH0 - RH ≤ △RH1, both the return air vent and the fresh air vent are opened, and the opening degree of the fresh air vent is adjusted to be greater than the opening degree of the return air vent, so as to switch the air conditioning system to mixed return air mode two.

[0010] Furthermore, in the mixed return air mode one and the mixed return air mode two,

[0011] The opening degree of the fresh air inlet is:

[0012] The opening degree of the return air vent is 1-K; where k0 is the initial set opening degree of the fresh air vent, and k is the set opening degree adjustment coefficient.

[0013] Furthermore, S20 includes:

[0014] When -100% < RH0 - RH < -ΔRH1, close the fresh air inlet and open the return air inlet to the maximum to switch the air conditioning system to full return air mode;

[0015] When △RH1 < RH0 - RH < 100%, close the return air vent and open the fresh air vent to its maximum to switch the air conditioning system to 100% fresh air mode.

[0016] Furthermore, the mixing chamber of the air conditioning system is equipped with a fan and a heat exchange coil, and the dehumidification control method further includes:

[0017] S30. At every second set time interval, detect the real-time indoor humidity RH0 and compare the real-time indoor humidity RH0 with the set humidity.

[0018] S40. Based on the comparison results, adjust the operation of the fan and the heat exchange coil.

[0019] Furthermore, S40 includes:

[0020] When RH0 < 60%, the fan and the heat exchange coil operate in the conventional mode, wherein the heat exchange coil is in a cooling state;

[0021] When the RH is 60% ≤ RH0 ≤ 70%, the fan speed is increased compared to the conventional mode;

[0022] When RH0 > 70%, the fan speed is increased and the temperature of the heat exchange coil is decreased compared to the conventional mode.

[0023] Furthermore, the air conditioning system also includes an electric heater, and the dehumidification control method further includes:

[0024] S50. When RH0≥60%, after increasing the speed of the fan for a third set time, detect the real-time indoor temperature T and compare it with the indoor set temperature T0.

[0025] S60. Based on the comparison results, adjust the operation of the fan, the heat exchange coil, and the electric heater.

[0026] Furthermore, the S60 includes:

[0027] When T0-T>△T, where △T is the set temperature difference, the heat exchange coil stops cooling and the electric heater is turned on for heating;

[0028] When T0-T≤△T, the fan and the heat exchange coil are adjusted to operate in the conventional mode, wherein the electric heater is in a stopped state.

[0029] According to another aspect of the present invention, an air conditioning system is provided, wherein the air conditioning system employs the above-described dehumidification control method.

[0030] Furthermore, the air conditioning system is a fan coil unit, which includes an outer shell structure, a fresh air valve, a return air valve, a fan, a heat exchange coil, and an electric heater. The outer shell structure has a mixing chamber and a fresh air inlet for inputting outdoor fresh air into the mixing chamber and a return air inlet for inputting indoor return air into the mixing chamber. The fresh air valve is located at the fresh air inlet and is used to open and close the fresh air inlet and adjust its opening degree. The return air valve is located at the return air inlet and is used to open and close the return air inlet and adjust its opening degree. The fan, the heat exchange coil, and the electric heater are all installed inside the outer shell structure.

[0031] In this solution, for air conditioning systems with fresh air function, when dehumidifying the indoor environment, the real-time indoor humidity RH0 and outdoor humidity RH are measured at regular intervals. The difference between the real-time indoor humidity RH0 and outdoor humidity RH is compared with a set difference ΔRH1. Based on the comparison result, the opening of the fresh air inlet and return air inlet is adjusted to switch the dehumidification mode of the air conditioning system. That is, the humidity factor of the fresh air introduced from the outside is considered during dehumidification operation. Both outdoor and indoor humidity are taken into account, and the opening of the fresh air inlet and return air inlet is adjusted according to the humidity conditions. This actively regulates the ratio of fresh air to return air entering the mixing chamber to prevent excessive humidity in the mixing chamber. Then, condensation dehumidification is performed through heat exchange tubes, thereby improving the dehumidification effect and reducing system energy consumption. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 A schematic flowchart of the dehumidification control method provided by an embodiment of the present invention is shown;

[0034] Figure 2 A schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention is shown.

[0035] The above figures include the following reference numerals:

[0036] 10. Mixing chamber; 20. Shell structure; 30. Fresh air valve; 40. Return air valve; 50. Fan; 60. Heat exchange coil; 70. Electric heater. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] like Figures 1 to 2 As shown, an embodiment of the present invention provides a dehumidification control method for controlling an air conditioning system. The air conditioning system has a mixing chamber 10 and a fresh air inlet for inputting outdoor fresh air into the mixing chamber 10 and a return air inlet for inputting indoor return air into the mixing chamber 10. The dehumidification control method includes:

[0039] S10. At each first set time interval, detect the indoor real-time humidity RH0 and the outdoor real-time humidity RH, calculate the difference between the indoor real-time humidity RH0 and the outdoor real-time humidity RH, and compare the calculated difference with the set difference △RH1.

[0040] S20. Adjust the opening of the fresh air inlet and return air inlet according to the comparison results to switch the dehumidification mode of the air conditioning system.

[0041] In this solution, for air conditioning systems with fresh air function, when dehumidifying the indoor environment, the real-time indoor humidity RH0 and outdoor humidity RH are measured at regular intervals. The difference between the real-time indoor humidity RH0 and outdoor humidity RH is compared with a set difference ΔRH1. Based on the comparison result, the opening of the fresh air inlet and return air outlet is adjusted to switch the dehumidification mode of the air conditioning system. That is, the humidity factor of the fresh air introduced from the outside is considered during dehumidification operation. The outdoor humidity and indoor humidity are taken into account, and the opening of the fresh air inlet and return air outlet is adjusted according to the humidity. The ratio of fresh air and return air entering the mixing chamber 10 is actively adjusted to ensure that the air humidity in the mixing chamber 10 is not too high. Then, condensation dehumidification is performed through the heat exchange tube, thereby improving the dehumidification effect and reducing system energy consumption.

[0042] The opening degree of both the fresh air inlet and the return air inlet is directly proportional to the circulation area. When the opening degree of the fresh air inlet and the return air inlet is the same, the circulation area is equal. The value of △RH1 can be 8%-15%, for example, 10% or 12%.

[0043] Specifically, S20 includes: when -△RH1≤RH0-RH≤0, both the return air vent and the fresh air vent are opened, and the opening degree of the return air vent is adjusted to be greater than the opening degree of the fresh air vent, so as to switch the air conditioning system to mixed return air mode one. That is, the humidity of the outdoor fresh air is greater than the humidity of the indoor air, and within the set difference value.

[0044] In this situation, fresh air can be introduced into the room, but excessive introduction of outdoor fresh air should be avoided to prevent a significant increase in indoor humidity. Therefore, both the return air vent and the fresh air vent are opened, and the opening of the return air vent is adjusted to be greater than that of the fresh air vent. This ensures that the flow area of ​​the return air vent is larger than that of the fresh air vent, resulting in a greater volume of return air entering the mixing chamber 10 than the volume of fresh air. This avoids a significant increase in system energy consumption due to the introduction of a large amount of fresh air during dehumidification; in other words, by increasing the return air volume, system energy consumption can be reduced.

[0045] When 0 < RH0 - RH ≤ △RH1, both the return air vent and the fresh air vent are opened, and the opening degree of the fresh air vent is adjusted to be greater than that of the return air vent, in order to switch the air conditioning system to mixed return air mode two. That is, the humidity of the outdoor fresh air is less than the humidity of the indoor air, and within the set difference value.

[0046] In this scenario, a larger amount of fresh air can be introduced into the room. Introducing fresh air improves air quality and also dehumidifies the room. Therefore, both the return air vent and the fresh air vent are opened, with the opening of the fresh air vent greater than that of the return air vent. This ensures that the flow area of ​​the fresh air vent is larger than that of the return air vent, resulting in a greater volume of fresh air entering the mixing chamber 10 than the volume of return air. This reduces system energy consumption during dehumidification due to the introduction of fresh air.

[0047] Furthermore, in mixed return air mode one and mixed return air mode two,

[0048] The opening degree of the new air vent is:

[0049] The opening degree of the return air vent is 1-K; where k0 is the initial setting opening degree of the fresh air vent, and k is the set opening degree adjustment coefficient.

[0050] The above settings establish a correlation between the opening degrees of the fresh air inlet and return air inlet and the real-time indoor humidity (RH0) and outdoor humidity (RH). The opening degrees of the fresh air inlet and return air inlet are dynamically adjusted based on humidity detection. This can be understood as decreasing the fresh air inlet opening and increasing the return air inlet opening when outdoor humidity increases, and increasing the fresh air inlet opening and decreasing the return air inlet opening when outdoor humidity decreases. This allows for active adjustment of the ratio of fresh air to return air entering the mixing chamber 10, thereby improving dehumidification and reducing system energy consumption while simultaneously exchanging fresh air.

[0051] Furthermore, in this scheme, S20 includes: when -100% < RH0 - RH < -ΔRH1, closing the fresh air inlet and opening the return air inlet to the maximum to switch the air conditioning system to full return air mode.

[0052] In this situation, where outdoor humidity is too high, introducing fresh air into the room would significantly increase indoor humidity, affecting the dehumidification load of the air conditioning system and resulting in high dehumidification energy consumption. Therefore, closing the fresh air vent prevents excessively humid fresh air from being introduced into the room, ensuring that only indoor return air enters the mixing chamber 10, thereby reducing system energy consumption during dehumidification.

[0053] When △RH1<RH0-RH<100%, close the return air vent and open the fresh air vent to its maximum to switch the air conditioning system to 100% fresh air mode.

[0054] In this situation, the outdoor air is relatively dry, and the outdoor humidity is significantly lower than that indoors. By closing the return air vent and opening the fresh air vent to its maximum, a large amount of fresh air can be introduced, which can quickly reduce the indoor humidity and reduce the system energy consumption during dehumidification.

[0055] like Figure 1 and Figure 2 As shown, the mixing chamber 10 of the air conditioning system is equipped with a fan 50 and a heat exchange coil 60. The dehumidification control method further includes: S30, detecting the real-time indoor humidity RH0 at every second set time interval, and comparing the real-time indoor humidity RH0 with the set humidity; S40, adjusting the operation of the fan 50 and the heat exchange coil 60 according to the comparison result.

[0056] That is, at set intervals, the fan speed 50 and the temperature of the heat exchange coil 60 are adjusted according to the detected real-time indoor humidity RH0. This helps to achieve dehumidification efficiently while reducing energy consumption.

[0057] Specifically, S40 includes:

[0058] When RH0 < 60%, the fan 50 and heat exchange coil 60 operate in normal mode, with heat exchange coil 60 in cooling mode. Under these conditions, the indoor humidity is not too high, and rapid dehumidification is not required. The fan 50 and heat exchange coil 60 can operate in normal mode, that is, the fan speed does not need to be too high (the fan speed is not the maximum value), and the temperature of the heat exchange coil 60 does not need to be too low (the temperature of the heat exchange coil 60 is not the minimum value), in order to save energy.

[0059] When the RH is 60%≤RH0≤70%, the fan speed of the fan 50 is increased compared to the conventional mode. By increasing the fan speed of the fan 50, the ventilation volume can be increased, thereby accelerating the heat exchange between the air and the heat exchange coil 60, accelerating the condensation of water vapor in the air, and improving the dehumidification efficiency.

[0060] Optionally, when RH0 is 60%, the speed of fan 50 is increased to 80% of the maximum speed; when RH0 is 65%, the speed of fan 50 is increased to 90% of the maximum speed; and when RH0 is 70%, the speed of fan 50 is increased to 100% of the maximum speed.

[0061] When RH0 > 70%, the fan speed 50 is increased and the heat exchange coil 60 temperature is decreased compared to the conventional mode. In this case, the indoor humidity is high. By increasing the fan speed 50 and decreasing the heat exchange coil 60, the ventilation volume is increased and the air cooling is accelerated, thereby improving dehumidification efficiency.

[0062] In this situation, the indoor humidity is too high, and simply increasing the speed of the fan 50 for dehumidification is inefficient. Lowering the temperature of the heat exchange coil 60 can further improve dehumidification efficiency. Optionally, when RH0 > 70%, the speed of the fan 50 is adjusted to the maximum; when 70% < RH0 ≤ 80%, the temperature of the heat exchange coil 60 is reduced by 2°C to 5°C compared to the normal mode; when RH0 > 80%, the temperature of the heat exchange coil 60 is reduced to the lowest value that the system can adjust.

[0063] Furthermore, the air conditioning system also includes an electric heater 70, and the dehumidification control method also includes:

[0064] S50. When RH0≥60%, increase the speed of fan 50 for a third set time, detect the real-time indoor temperature T, and compare it with the indoor set temperature T0; S60. Based on the comparison result, adjust the operation of fan 50, heat exchange coil 60 and electric heater 70.

[0065] In the S40, increasing dehumidification efficiency accelerates the cooling of indoor air. However, excessive temperature drop can affect the comfort of occupants. Therefore, by detecting the real-time indoor temperature T and comparing it with the set indoor temperature T0, a significant temperature drop can be detected promptly. This allows for adjustments to the operation of the fan 50, heat exchange coil 60, and electric heater 70 to prevent excessive temperature reduction from impacting comfort.

[0066] Specifically, S60 includes: when T0-T>△T, stopping the cooling of the heat exchange coil 60 and turning on the electric heater 70 for heating; in this case, the indoor temperature drops significantly, so dehumidification is temporarily stopped, and the indoor temperature is raised by turning on the electric heater 70 before resuming dehumidification. This balances indoor dehumidification with the comfort of the people inside.

[0067] When T0-T≤△T, adjust the fan 50 and heat exchange coil 60 to operate in normal mode, with the electric heater 70 in a stopped state. That is, after increasing the speed of the fan 50 or decreasing the temperature of the heat exchange coil 60 to accelerate dehumidification efficiency for a period of time, switch to normal mode operation to avoid excessive drop in indoor temperature caused by dehumidification operation, so as to balance indoor dehumidification and the comfort of indoor occupants.

[0068] Where △T is the set temperature difference value, which can be set to 3℃-5℃, for example 4℃.

[0069] like Figure 2 As shown, the present invention also provides an air conditioning system that employs the above-described dehumidification control method.

[0070] Specifically, the air conditioning system is a fan coil unit. The air conditioning system includes an outer shell structure 20, a fresh air valve 30, a return air valve 40, a fan 50, a heat exchange coil 60, and an electric heater 70. The outer shell structure 20 has a mixing chamber 10 and a fresh air inlet for inputting outdoor fresh air into the mixing chamber 10 and a return air inlet for inputting indoor return air into the mixing chamber 10. The fresh air valve 30 is located at the fresh air inlet and is used to open and close the fresh air inlet and adjust its opening. The return air valve 40 is located at the return air inlet and is used to open and close the return air inlet and adjust its opening. The fan 50, the heat exchange coil 60, and the electric heater 70 are all installed inside the outer shell structure 20.

[0071] The air conditioning system adopts the above method, which takes into account the humidity of the fresh air introduced from the outside during dehumidification operation. It comprehensively considers the outdoor humidity and indoor humidity, and adjusts the opening of the fresh air inlet and return air inlet according to the humidity. It actively adjusts the ratio of fresh air and return air entering the mixing chamber 10 so that the air humidity in the mixing chamber 10 is not too high. Then, it performs condensation dehumidification through the heat exchange tube, thereby improving the dehumidification effect and reducing the system energy consumption.

[0072] The above description is merely an optional embodiment of this solution and is not intended to limit the solution. Various modifications and variations can be made to this solution by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this solution should be included within the scope of protection of this solution.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0075] In the description of this solution, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing this solution and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this solution. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0076] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0077] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this solution.

Claims

1. A dehumidification control method for controlling an air conditioning system, the air conditioning system having a mixing chamber (10) and a fresh air inlet for inputting outdoor fresh air into the mixing chamber (10) and a return air inlet for inputting indoor return air into the mixing chamber (10), characterized in that, The dehumidification control method includes: S10. At each first set time interval, detect the indoor real-time humidity RH0 and the outdoor real-time humidity RH, calculate the difference between the indoor real-time humidity RH0 and the outdoor real-time humidity RH, and compare the calculated difference with the set difference △RH1. S20. Adjust the opening of the fresh air inlet and the return air inlet according to the comparison results to switch the dehumidification mode of the air conditioning system.

2. The dehumidification control method according to claim 1, characterized in that, S20 includes: When -△RH1≤RH0-RH≤0, both the return air vent and the fresh air vent are opened, and the opening degree of the return air vent is adjusted to be greater than the opening degree of the fresh air vent, so as to switch the air conditioning system to mixed return air mode one. When 0 < RH0 - RH ≤ △RH1, both the return air vent and the fresh air vent are opened, and the opening degree of the fresh air vent is adjusted to be greater than the opening degree of the return air vent, so as to switch the air conditioning system to mixed return air mode two.

3. The dehumidification control method according to claim 2, characterized in that, In the mixed return air mode one and the mixed return air mode two, The opening degree of the fresh air inlet is: The opening degree of the return air vent is 1-K; Wherein, k0 is the initial set opening degree of the fresh air inlet, and k is the set opening degree adjustment coefficient.

4. The dehumidification control method according to any one of claims 1-3, characterized in that, S20 includes: When -100% < RH0 - RH < -ΔRH1, close the fresh air inlet and open the return air inlet to the maximum to switch the air conditioning system to full return air mode; When △RH1 < RH0 - RH < 100%, close the return air vent and open the fresh air vent to its maximum to switch the air conditioning system to 100% fresh air mode.

5. The dehumidification control method according to any one of claims 1-3, characterized in that, The air conditioning system's mixing chamber (10) is equipped with a fan (50) and a heat exchange coil (60), and the dehumidification control method further includes: S30. At every second set time interval, detect the real-time indoor humidity RH0 and compare the real-time indoor humidity RH0 with the set humidity. S40. Based on the comparison results, adjust the operation of the fan (50) and the heat exchange coil (60).

6. The dehumidification control method according to claim 5, characterized in that, S40 includes: When RH0 < 60%, the fan (50) and the heat exchange coil (60) operate in the normal mode, wherein the heat exchange coil (60) is in the cooling state; When the RH0 ≤ 60% ≤ 70%, the speed of the fan (50) is increased relative to the conventional mode; When RH0 > 70%, the speed of the fan (50) is increased and the temperature of the heat exchange coil (60) is decreased compared to the conventional mode.

7. The dehumidification control method according to claim 6, characterized in that, The air conditioning system further includes an electric heater (70), and the dehumidification control method further includes: S50. When RH0≥60%, after increasing the speed of the fan (50) for a third set time, detect the real-time indoor temperature T and compare it with the indoor set temperature T0. S60. Based on the comparison results, adjust the operation of the fan (50), the heat exchange coil (60), and the electric heater (70).

8. The dehumidification control method according to claim 7, characterized in that, The S60 includes: When T0-T>△T, where △T is the set temperature difference, the heat exchange coil (60) stops cooling and the electric heater (70) is turned on for heating; When T0-T≤△T, the fan (50) and the heat exchange coil (60) are adjusted to operate in the conventional mode, wherein the electric heater (70) is in a stopped state.

9. An air conditioning system, characterized in that, The air conditioning system employs the dehumidification control method as described in any one of claims 1 to 8.

10. The air conditioning system according to claim 9, characterized in that, The air conditioning system is a fan coil unit. The air conditioning system includes an outer shell structure (20), a fresh air valve (30), a return air valve (40), a fan (50), a heat exchange coil (60), and an electric heater (70). The outer shell structure (20) has a mixing chamber (10) and a fresh air inlet for inputting outdoor fresh air into the mixing chamber (10) and a return air inlet for inputting indoor return air into the mixing chamber (10). The fresh air valve (30) is located at the fresh air inlet and is used to open and close the fresh air inlet and adjust its opening. The return air valve (40) is located at the return air inlet and is used to open and close the return air inlet and adjust its opening. The fan (50), the heat exchange coil (60), and the electric heater (70) are all installed inside the outer shell structure (20).

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