Fan coil units and their control methods, air conditioning units

Abstract

This invention provides a fan coil unit and its control method, as well as an air conditioning unit. A fan coil unit includes: a housing with an air outlet; at least one return air duct, the first end of which is connected to the housing; the fan coil unit has at least two return air inlets, and at least one return air inlet is provided on one of the return air ducts; all the return air inlets are distributed at different locations indoors. The fan coil unit and its control method provided by this invention, by providing an air outlet on the housing, allow the fan coil unit to directly discharge air at the location of the housing, while simultaneously utilizing the return air duct to return air at different locations indoors, creating a negative pressure at the location of the return air inlet. This negative pressure achieves the purpose of cooling at that location. Since the user is in the return air area, the return air area is large, resulting in a lower return air velocity, thereby effectively avoiding direct airflow onto the user and improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of air handling equipment technology, and in particular to a fan coil unit and its control method, and an air conditioning unit. Background Technology

[0002] Fan coil units are terminal products of air conditioning systems, used to regulate indoor environmental comfort. They are equipped with heat exchangers and fans, which transport indoor air to the heat exchanger for heat exchange, and then return it to the room, thus achieving heat exchange in the room.

[0003] Current central air conditioning systems typically connect a section of air outlet duct to the air vent, with one or more holes below the duct serving as air outlets to supply air to the room. To increase the air delivery distance, these outlets are often designed as multiple narrow strips, thereby increasing the airflow velocity and allowing the air to travel further. However, this method results in cold air being blown directly onto the user at a relatively high speed, causing significant discomfort. Prolonged exposure to direct cold air can easily lead to illness, severely impacting the user experience. Summary of the Invention

[0004] To address the technical problem of poor user experience caused by direct airflow to users through air supply ducts in existing technologies, a fan coil unit and its control method, as well as an air conditioning unit, are provided. These utilize return air ducts to return air to the target user, thereby directing cool air to the target user for cooling and avoiding direct airflow to the user, thus improving the user experience.

[0005] A fan coil unit, comprising:

[0006] A housing having an air outlet formed thereon;

[0007] At least one return air duct, the first end of which is connected to the housing;

[0008] The fan coil unit has at least two return air inlets, and at least one of the return air inlets is provided on one of the return air ducts;

[0009] All of the aforementioned return air vents are located in different positions within the room.

[0010] The fan coil unit also includes a control mechanism, which is used to obtain the location of the target user and / or the user's required heat exchange, and the control mechanism is capable of adjusting the opening of all the return air vents.

[0011] Each of the aforementioned return air vents is equipped with an opening adjustment mechanism, and all of the aforementioned opening adjustment mechanisms are electrically connected to the control mechanism.

[0012] The housing has at least two sides, with the orientation of two adjacent sides forming an angle, and at least one return air duct is provided on each side.

[0013] The central axis of each of the return air ducts extends along the orientation direction of the corresponding side.

[0014] The fan coil unit further includes a heat exchanger, which is disposed inside the housing and located between the air outlet and all the return air ducts; and / or, the fan coil unit further includes a heat exchanger, which corresponds one-to-one with the return air duct, and a heat exchanger is provided at the first end of each return air duct.

[0015] The housing has a bottom surface, the air outlet is disposed on the bottom surface, and the air outlet is vertically downward.

[0016] The fan coil unit also includes a fan, which is disposed inside the housing and the air outlet of the fan faces the air outlet. The speed of the fan is adjustable.

[0017] A control method for the above-mentioned fan coil unit includes:

[0018] Obtain the target user's location and open the return air vent closest to the target user's location.

[0019] After obtaining the target user's location and opening the return air vent closest to the target user's location, the process also includes:

[0020] Obtain the user's required heat exchange capacity Q1, and compare Q1 with the maximum heat exchange capacity Q corresponding to a single return air vent;

[0021] If Q1 > Q, then open the adjacent return air vent;

[0022] If Q1≤Q, then adjust the opening degree of the return air vent that is in the open state and / or adjust the fan speed.

[0023] An air conditioning unit includes the aforementioned fan coil unit or the aforementioned fan coil unit control method.

[0024] The fan coil unit and its control method, as well as the air conditioning unit provided by this invention, allow the fan coil unit to directly output air at the location of the casing by setting an air outlet on the casing. At the same time, it uses a return air duct to return air at different locations in the room, so that a negative pressure can be generated at the location of the return air outlet. This negative pressure can guide the cold air to the location of the return air outlet, thereby achieving the purpose of cooling at this location. Since the user is in the return air area, the return air area is large, resulting in a low return air velocity (1m / s), which effectively avoids direct blowing on the user and improves the user experience. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a fan coil unit in the prior art;

[0026] Figure 2 This is a diagram showing the gas velocity distribution in a fan coil unit in the prior art.

[0027] Figure 3 This is a schematic diagram of the structure of a fan coil unit provided in an embodiment of the present invention;

[0028] Figure 4 This is another structural schematic diagram of a fan coil unit provided in an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of a fan coil unit with two return air ducts symmetrically arranged according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of a fan coil unit with a return air duct provided in an embodiment of the present invention;

[0031] Figure 7 for Figure 6 Gas velocity distribution diagram in the image;

[0032] Figure 8 This is a gas flow diagram of a fan coil unit with vent 1 open and vents 2 and 3 closed, provided in an embodiment of the present invention.

[0033] Figure 9 This is a gas flow diagram of a fan coil unit with vent 2 open and vents 1 and 3 closed, provided in an embodiment of the present invention.

[0034] Figure 10 This is a gas flow diagram of a fan coil unit with vent 3 open and vents 1 and 2 closed, provided in an embodiment of the present invention.

[0035] In the picture:

[0036] 101. Shell; 102. Air outlet; 103. Return air duct; 104. Return air inlet; 105. Heat exchanger; 106. Fan. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Existing central air conditioning systems typically connect a section of air outlet duct to the air outlet, with one or more holes below the duct serving as air vents to supply air to the room. To increase the air delivery distance, these vents are often designed as multiple narrow strips, thereby increasing the airflow velocity and allowing the air to travel further. However, this method results in cold air blowing directly onto the user at a relatively high velocity, causing significant discomfort. Prolonged exposure to direct cold air can easily lead to illness, severely impacting the user experience. Therefore, this application provides a method... Figures 3 to 10The fan coil unit shown includes: a housing 101 with an air outlet 102 formed thereon; at least one return air duct 103, the first end of which is connected to the housing 101; the fan coil unit has at least two return air inlets 104, and each return air duct 103 is provided with at least one return air inlet 104; all the return air inlets 104 are distributed at different locations in the room. By providing the air outlet 102 on the housing 101, the fan coil unit can directly outlet air at the location of the housing 101, while using the return air duct 103 to return air at different locations in the room, so that a negative pressure can be generated at the location of the return air inlet 104. This negative pressure can guide the cold air to the location of the return air inlet 104, thereby achieving the purpose of cooling this location. Since the user is in the return air area, the return air area is large, resulting in a low return air velocity (1m / s), thus effectively avoiding direct airflow to the user and improving the user experience. Figure 2 and Figure 7 As shown, the wind speed around the human body in the prior art is 2 m / s, while the wind speed around the human body in this application is 1 m / s, which effectively reduces the wind speed at the user's location and thus avoids the problem of cold air blowing directly.

[0043] Specifically, the fan coil unit also includes a control mechanism. This control mechanism is used to acquire the location of the target user and / or the user's required heat exchange capacity. The control mechanism can also adjust the opening degree of all return air vents 104. By acquiring the target user's location through the control mechanism, the system controls the opening of the return air vents 104 adjacent to the target user's location to allow for return air, thereby cooling the target user's location and effectively improving the user experience. Furthermore, the control mechanism can acquire the user's required heat exchange capacity and, based on the required heat exchange capacity and the maximum heat exchange capacity corresponding to each return air vent 104, determine whether the current fan coil unit can meet the user's needs. Based on the determination result, it adjusts the opening degree of the return air vents 104, the number of open return air vents 104, and the order in which the return air vents 104 are opened, precisely matching the heat exchange capacity of the fan coil unit with the user's required heat exchange capacity. This improves the heat exchange efficiency and operational reliability of the fan coil unit and also avoids ineffective heat exchange, reducing energy consumption.

[0044] To further improve the matching accuracy between the heat exchange capacity of the fan coil unit and the user's required heat exchange capacity, an opening adjustment mechanism is provided at each of the return air inlets 104. All of these opening adjustment mechanisms are electrically connected to the control mechanism. The control mechanism can control the opening degree of each return air inlet 104, thereby adjusting whether the return air inlet 104 is open or closed, and can also adjust the return air volume at the return air inlet 104 to adjust the heat exchange capacity of the fan coil unit. This ensures that the heat exchange capacity of the fan coil unit is as close as possible to the user's required heat exchange capacity, improving the heat exchange efficiency and operational reliability of the fan coil unit, and also preventing ineffective heat exchange and reducing energy consumption. The opening adjustment structure includes a drive device and a damper. The drive device can drive the damper to adjust the opening degree of the return air inlet 104.

[0045] After the control mechanism obtains the user's required heat exchange capacity, if the current fan coil unit already meets the user's required heat exchange capacity, the opening of the return air vent 104 is adjusted to ensure that the heat exchange capacity of the fan coil unit precisely matches the user's required heat exchange capacity. When the opening of the return air vent 104 is reduced, the return air volume of the return air vent 104 can be reduced, thereby reducing the heat exchange capacity of the fan coil unit. When the opening of the return air vent 104 is increased, the return air volume of the return air vent 104 can be increased, thereby increasing the heat exchange capacity of the fan coil unit. If the current fan coil unit cannot meet the user's required heat exchange capacity, the return air vent 104 adjacent to the already opened return air vent 104 is opened, thereby increasing the heat exchange capacity of the fan coil unit and thus improving the heat exchange capacity at the target user's location until the user's required heat exchange capacity is met.

[0046] Taking a return air duct 103 with multiple return air inlets 104 as an example, all return air inlets 104 are arranged sequentially along the length of the return air duct 103, and along the direction away from the housing 101, all return air inlets 104 are sequentially numbered as air inlet 1, air inlet 2, ..., air inlet n;

[0047] When a user is at air vent n, air vent n is opened first, and then it is determined whether the maximum heat exchange of air vent n meets the current user's heat exchange needs.

[0048] If the conditions are met, then the opening of the air outlet n is adjusted to match (become basically equal to) the heat exchange capacity of the fan coil unit with the heat exchange capacity required by the user.

[0049] If not, continue to open the air vent n-1 and determine again whether the heat exchange capacity of the current fan coil unit meets the user's heat exchange needs.

[0050] If the conditions are met, adjust the opening of the air outlet n-1 to match (become essentially equal to) the heat exchange capacity of the fan coil unit with the user's required heat exchange capacity.

[0051] If the requirements are still not met, continue to open vent n-2 and repeat the above steps until the heat exchange capacity of the fan coil unit matches (is essentially equal to) the user's required heat exchange capacity.

[0052] or,

[0053] When the user is at air vent n-3, air vent n-3 is opened first, and then it is determined whether the maximum heat exchange of air vent n-3 meets the current user's heat exchange needs.

[0054] If the conditions are met, then determine to adjust the opening of air outlet n-3 so that the heat exchange of the fan coil unit matches (is basically equal to) the heat exchange required by the user.

[0055] If not, continue to open air vent n-4 or air vent n-2, and re-determine whether the heat exchange capacity of the current fan coil unit meets the user's heat exchange requirements.

[0056] Taking opening vent n-4 as an example, if the conditions are met, adjust the opening of vent n-4 so that the heat exchange of the fan coil unit matches (is basically equal to) the heat exchange required by the user.

[0057] If the requirements are still not met, continue to open air vent n-5 or air vent n-2 and repeat the above steps until the heat exchange capacity of the fan coil unit matches (is basically equal to) the heat exchange capacity required by the user.

[0058] Taking opening vent n-2 as an example, if the conditions are met, adjust the opening of vent n-2 to match (become basically equal to) the heat exchange capacity of the fan coil unit with the heat exchange capacity required by the user.

[0059] If the requirements are still not met, continue to open vent n-1 or vent n-4 and repeat the above steps until the heat exchange capacity of the fan coil unit matches (is essentially equal to) the heat exchange capacity required by the user.

[0060] As shown in the figure, there are three return air vents 104, which are numbered from left to right as vent 1, vent 2, and vent 3.

[0061] If there is someone at vent 1 and no one at vent 2 or vent 3, then vent 2 and vent 3 will be closed, and vent 1 will be opened.

[0062] Assuming the maximum return air volume of the air vent is A m³ / h, with vent 1 fully open and the fan speed adjusted synchronously, the corresponding output air volume is A m³ / h, resulting in a cooling output of Q kW. Assuming the cooling demand is Q1 kW, if Q1 < Q, the angle of vent 1 is reduced to decrease the return air volume, and the fan speed is adjusted to decrease the supply air volume, reducing the actual cooling output to the required cooling capacity Q1. If Q1 > Q, vent 1 is adjusted to its maximum, and vent 2 is opened synchronously. The opening of vent 2 and the fan speed are adjusted to increase the air volume output from outlet 102, thus increasing the corresponding cooling capacity (heat exchange), until the required cooling capacity Q1 is met. If both vents 1 and vent 2 are fully open and the cooling demand is still not met, vent 3 is opened synchronously until the cooling demand is met.

[0063] The maximum heat exchange capacity refers to the heat exchange capacity that the fan coil unit can output when the return air vent 104 is at its maximum opening. The opening of each return air vent 104 can be adjusted from zero to its maximum. When the opening of the return air vent 104 is zero, the return air vent 104 is in a closed state.

[0064] The control mechanism includes an infrared sensing mechanism, which uses the infrared sensing mechanism to obtain the indoor temperature distribution and determine the user's location based on preset conditions (such as the temperature being within a preset temperature range), thereby determining the location of the target user.

[0065] Since central air conditioning systems are typically located in the center of a room, the casing 101 has at least two sides to ensure heat exchange in all areas. The orientation directions of adjacent sides form an angle, and each side is equipped with at least one return air duct 103. By utilizing multiple return air ducts 103 arranged in different directions, return air can be distributed to different locations within the room, effectively improving the heat exchange effect. Specifically, the central axis of each return air duct 103 extends along the orientation direction of the corresponding side. That is, the return air duct 103 is perpendicular to the plane of the side on which it is installed, avoiding structural interference between adjacent return air ducts 103 and facilitating the arrangement of the fan and heat exchanger within the casing 101, ensuring the reliable operation of the fan coil unit. Specifically, the fan coil unit further includes a heat exchanger 105, which is disposed within the housing 101 and located between the air outlet 102 and all the return air ducts 103. Positioning the heat exchanger 105 at the air outlet 102 ensures that the return air from each return air duct 103 can be heat-exchanged through the heat exchanger 105 before being discharged into the room, thus ensuring reliable heat exchange in the fan coil unit. In another embodiment, the fan coil unit further includes a heat exchanger 105, which corresponds one-to-one with each return air duct 103, with one heat exchanger 105 located at the first end of each return air duct 103. When the fan coil unit is working, only the return air duct 103 in the return air state and the heat exchanger 105 set at the first end of the return air duct 103 need to be turned on. This avoids the problem of increased energy consumption of the fan coil unit caused by turning on multiple heat exchangers 105 at the same time, and makes the heat exchange of the fan coil unit accurately match the heat exchange demand of the user.

[0066] Since the fan coil unit is suspended from the ceiling, the top surface of the housing 101 is inside the suspended ceiling or ceiling, preventing it from venting air into the room. Therefore, the housing 101 has a bottom surface, and the air outlet 102 is located on this bottom surface, with the air outlet 102 venting vertically downwards. This allows the cool air blown out of the air outlet 102 to quickly reach the ground, where it is then drawn in by the negative pressure at the return air vent 104. This allows the cool air to circulate within a range of human height and flow upwards at the user's location before entering the return air vent 104, ensuring adequate cooling for the user and improving the user experience.

[0067] The fan coil unit also includes a fan 106, which is disposed within the housing 101, and the air outlet direction of the fan 106 faces the air outlet 102. The fan speed of the fan 106 is adjustable. The fan speed of the fan 106 can be adjusted according to the return air volume of all return air outlets 104, so that the air volume of the fan 106 can be precisely matched with the return air volume. This avoids the problem of excessive air velocity at the return air outlet 104 and heat exchanger 105 due to excessive fan speed, which would affect the heat exchange efficiency, and also avoids the problem of insufficient heat exchange capacity of the fan coil unit due to insufficient fan speed, thus improving the operational reliability of the fan coil unit. The heat exchange capacity and / or number of heat exchangers 105 and the air volume and / or number of fans 106 are determined based on the maximum heat exchange demand of the room where the fan coil unit is located.

[0068] A control method for the above-mentioned fan coil unit includes:

[0069] The system obtains the location of the target user and opens the nearest return air vent 104 to cool the target user's location, effectively improving the user experience.

[0070] After obtaining the target user's location and opening the nearest return air vent 104, the process also includes:

[0071] Obtain the user's required heat exchange capacity Q1, and compare Q1 with the maximum heat exchange capacity Q corresponding to a single return air vent 104;

[0072] If Q1 > Q, then open the adjacent return air vent 104;

[0073] If Q1≤Q, then adjust the opening degree of the return air vent 104 in the open state and / or adjust the speed of the fan 106.

[0074] Specifically, after the control mechanism obtains the user's required heat exchange capacity, if the current fan coil unit already meets the user's required heat exchange capacity, the opening of the return air vent 104 is adjusted to ensure that the heat exchange capacity of the fan coil unit precisely matches the user's required heat exchange capacity. When the opening of the return air vent 104 is reduced, the return air volume of the return air vent 104 can be reduced, thereby reducing the heat exchange capacity of the fan coil unit. When the opening of the return air vent 104 is increased, the return air volume of the return air vent 104 can be increased, thereby increasing the heat exchange capacity of the fan coil unit. If the current fan coil unit cannot meet the user's required heat exchange capacity, the return air vent 104 adjacent to the already opened return air vent 104 is opened, thereby increasing the heat exchange capacity of the fan coil unit and thus improving the heat exchange capacity at the target user's location until the user's required heat exchange capacity is met.

[0075] Taking a return air duct 103 with multiple return air inlets 104 as an example, all return air inlets 104 are arranged sequentially along the length of the return air duct 103, and along the direction away from the housing 101, all return air inlets 104 are sequentially numbered as air inlet 1, air inlet 2, ..., air inlet n;

[0076] When a user is at air vent n, air vent n is opened first, and then it is determined whether the maximum heat exchange of air vent n meets the current user's heat exchange needs.

[0077] If the conditions are met, then the opening of the air outlet n is adjusted to match (become basically equal to) the heat exchange capacity of the fan coil unit with the heat exchange capacity required by the user.

[0078] If not, continue to open the air vent n-1 and determine again whether the heat exchange capacity of the current fan coil unit meets the user's heat exchange needs.

[0079] If the conditions are met, adjust the opening of the air outlet n-1 to match (become essentially equal to) the heat exchange capacity of the fan coil unit with the user's required heat exchange capacity.

[0080] If the requirements are still not met, continue to open vent n-2 and repeat the above steps until the heat exchange capacity of the fan coil unit matches (is essentially equal to) the user's required heat exchange capacity.

[0081] or,

[0082] When the user is at air vent n-3, air vent n-3 is opened first, and then it is determined whether the maximum heat exchange of air vent n-3 meets the current user's heat exchange needs.

[0083] If the conditions are met, then determine to adjust the opening of air outlet n-3 so that the heat exchange of the fan coil unit matches (is basically equal to) the heat exchange required by the user.

[0084] If not, continue to open air vent n-4 or air vent n-2, and re-determine whether the heat exchange capacity of the current fan coil unit meets the user's heat exchange requirements.

[0085] Taking opening vent n-4 as an example, if the conditions are met, adjust the opening of vent n-4 so that the heat exchange of the fan coil unit matches (is basically equal to) the heat exchange required by the user.

[0086] If the requirements are still not met, continue to open air vent n-5 or air vent n-2 and repeat the above steps until the heat exchange capacity of the fan coil unit matches (is basically equal to) the heat exchange capacity required by the user.

[0087] Taking opening vent n-2 as an example, if the conditions are met, adjust the opening of vent n-2 to match (become basically equal to) the heat exchange capacity of the fan coil unit with the heat exchange capacity required by the user.

[0088] If the requirements are still not met, continue to open vent n-1 or vent n-4 and repeat the above steps until the heat exchange capacity of the fan coil unit matches (is essentially equal to) the heat exchange capacity required by the user.

[0089] As shown in the figure, there are three return air vents 104, which are numbered from left to right as vent 1, vent 2, and vent 3.

[0090] If there is someone at vent 1 and no one at vent 2 or vent 3, then vent 2 and vent 3 will be closed, and vent 1 will be opened.

[0091] Assuming the maximum return air volume of the air vent is A m³ / h, with vent 1 fully open and the fan 106 adjusting its speed to output an air volume of A m³ / h, the corresponding cooling output is Q kW. Assuming the cooling demand is Q1 kW, if Q1 < Q, the angle of vent 1 is reduced to decrease the return air volume, and the fan 106 speed is adjusted to decrease the supply air volume, reducing the actual cooling output to the required cooling capacity Q1. If Q1 > Q, vent 1 is adjusted to its maximum, and vent 2 is opened simultaneously. The opening of vent 2 and the fan 106 speed are adjusted to increase the air volume output from outlet 102, thus increasing the corresponding cooling capacity (heat exchange) until the required cooling capacity Q1 is met. If both vents 1 and vent 2 are fully open and the cooling demand is not met, vent 3 is opened simultaneously until the cooling demand is met.

[0092] An air conditioning unit includes the aforementioned fan coil unit or the aforementioned fan coil unit control method.

[0093] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A control method for a fan coil unit, characterized in that, The fan coil unit includes a housing (101), at least one return air duct (103), and at least two return air inlets (104). An air outlet (102) is formed on the housing (101). The first end of the return air duct (103) is connected to the housing (101). At least one return air inlet (104) is provided on each return air duct (103). All the return air inlets (104) are distributed at different locations within the room. The method includes: Obtain the location of the target user and open the return air vent (104) closest to the target user's location. Obtain the user's required heat exchange capacity Q1, and compare Q1 with the maximum heat exchange capacity Q corresponding to a single return air inlet (104); If Q1 > Q, then open the adjacent return air vent (104). If Q1≤Q, then adjust the opening degree of the return air inlet (104) in the open state and / or adjust the speed of the fan (106).

2. A fan coil unit for implementing the control method for the fan coil unit as described in claim 1, characterized in that, The fan coil unit also includes: A fan (106) is disposed inside the housing (101), and the air outlet direction of the fan (106) is towards the air outlet (102). The speed of the fan (106) is adjustable.

3. The fan coil unit according to claim 2, characterized in that: The fan coil unit also includes a control mechanism for obtaining the location of the target user and / or the user's required heat exchange, and the control mechanism is capable of adjusting the opening of all the return air vents (104).

4. The fan coil unit according to claim 3, characterized in that: Each of the aforementioned return air inlets (104) is provided with an opening adjustment mechanism, and all of the aforementioned opening adjustment mechanisms are electrically connected to the control mechanism.

5. The fan coil unit according to claim 3, characterized in that: The housing (101) has at least two sides, the orientation directions of two adjacent sides are at an angle, and at least one return air duct (103) is provided on each side.

6. The fan coil unit according to claim 5, characterized in that: The central axis of each of the return air ducts (103) extends along the orientation direction of the corresponding side.

7. The fan coil unit according to claim 2, characterized in that: The fan coil unit further includes a heat exchanger (105), which is disposed inside the housing (101) and located between the air outlet (102) and all the return air pipes (103); and / or, the fan coil unit further includes a heat exchanger (105), which corresponds one-to-one with the return air pipes (103), and a heat exchanger (105) is provided at the first end of each return air pipe (103).

8. The fan coil unit according to claim 2, characterized in that: The housing (101) has a bottom surface, and the air outlet (102) is disposed on the bottom surface, with the air outlet (102) having an air outlet direction that is vertically downward.

9. An air conditioning unit, characterized in that: The control method for the fan coil unit as described in any one of claims 2 to 8 or the fan coil unit as described in claim 1.

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