Fan coil control method and device, medium, fan coil and air conditioning system

Abstract

The invention provides a fan coil control method and device, a medium, a fan coil and an air conditioning system. The control method of the fan coil comprises the steps that an indoor return air enthalpy value and a target enthalpy value are obtained; acquiring a required cold air ratio according to the indoor return air enthalpy value and the target enthalpy value; and the air supply amount of the fan coil is controlled according to the required cold air ratio and the refrigerant cold supply amount of the fan coil, so that the difference value between the real-time cold air ratio and the required cold air ratio of the fan coil is adjusted to be within the preset difference value range. By means of the technical scheme, the technical problem that in the prior art, a fan coil is poor in use comfort can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fan coil units, and in particular to a control method, a device, a medium, a fan coil unit and an air conditioning system for a fan coil unit. Background Art

[0002] At present, fan coil units are commonly used terminal devices in air conditioning systems. Their main functions are indoor air treatment and heat and moisture exchange. During operation, fan coil units need to adjust the cooling capacity and air volume to meet indoor temperature and humidity requirements.

[0003] However, when selecting fan coil units in the prior art, the maximum cooling and heating demand is often determined based on the worst weather conditions, and the cooling capacity and air volume are adjusted based on the maximum cooling and heating demand. However, in the daily operation of the unit, the cooling capacity corresponding to extreme weather conditions is not actually required, which causes the problem of mismatch between fan coil unit selection and daily demand. In this case, even if the air volume is reduced, the actual cooling capacity is too large, resulting in a large amount of cold wind, which makes the fan coil unit's dehumidification capacity too large, making the indoor environment relatively dry, affecting the user's comfort experience. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method, device, medium, fan coil unit and air conditioning system for a fan coil unit, so as to solve the technical problem of poor usage comfort of fan coil units in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present invention, a control method for a fan coil unit is provided, comprising:

[0006] Obtain indoor return air enthalpy value and target enthalpy value;

[0007] Obtain the required cooling air ratio according to the indoor return air enthalpy value and the target enthalpy value;

[0008] The air supply of the fan coil is controlled according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil, so that the difference between the real-time cooling air ratio of the fan coil and the required cooling air ratio is adjusted to within a preset difference range.

[0009] Further, the air supply of the fan coil unit is controlled according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil unit, including controlling the air supply of the fan coil unit according to a pre-adjustment process; the pre-adjustment process includes:

[0010] The cooling capacity of the refrigerant is sequentially reduced to a first cooling capacity, a second cooling capacity, and ... an nth cooling capacity;

[0011] When the refrigerant cooling capacity is operated according to the nth cooling capacity, the air supply volume is set to the nth air volume corresponding to the required cooling air ratio and the nth cooling capacity, and the nth operation time is maintained.

[0012] Further, the nth cooling capacity is the fourth cooling capacity; and / or,

[0013] The fan coil unit has j heat exchange tubes arranged in parallel, so that the cooling capacity of the refrigerant is reduced to the nth cooling capacity, including: opening j-n+1 heat exchange tubes and closing the remaining heat exchange tubes.

[0014] Furthermore, after the pre-adjustment process, the fan coil unit control method further includes:

[0015] Entering into the judgment process, the judgment process includes: comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters to obtain a comparison result;

[0016] Determining whether to enter a fine control process according to the comparison result, the fine control process includes: controlling the cooling amount and air supply amount of the refrigerant according to at least part of the comparison result;

[0017] The environmental parameters include at least one of the following: temperature, humidity and enthalpy.

[0018] Further, comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters includes: comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters according to a critical enthalpy judgment process, and the critical enthalpy judgment process includes:

[0019] Get the operation mode of the fan coil unit;

[0020] When the operation mode of the fan coil unit is cooling mode; when the difference between the indoor return air enthalpy value and the target enthalpy value is less than or equal to the preset enthalpy difference value, the actual temperature at the return air outlet of the fan coil unit is compared with the target temperature value; when the difference between the indoor return air enthalpy value and the target enthalpy value is greater than the preset enthalpy difference value, the indoor return air enthalpy value is compared with the target enthalpy value;

[0021] When the operation mode of the fan coil unit is heating mode; when the difference between the indoor return air enthalpy value and the target enthalpy value is greater than the preset enthalpy difference, the actual temperature at the return air outlet of the fan coil unit is compared with the target temperature value; when the difference between the indoor return air enthalpy value and the target enthalpy value is less than or equal to the preset enthalpy difference, the indoor return air enthalpy value is compared with the target enthalpy value.

[0022] Furthermore, the actual temperature at the return air outlet of the fan coil unit is compared with the target temperature value, including:

[0023] Determine whether the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value;

[0024] When the fan coil unit is in cooling mode, when the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature, the fine control process is entered; when the actual temperature at the return air outlet of the fan coil unit is less than the target temperature, the fan coil unit is stopped, and when the fan coil unit is in the stopped state for a time longer than the preset time, the critical enthalpy judgment process is re-entered;

[0025] When the operation mode of the fan coil unit is heating mode; when the actual temperature at the return air outlet of the fan coil unit is lower than the target temperature value, the fine control process is entered; when the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value, the fan coil unit is put into a shutdown state, and after the fan coil unit is in the shutdown state for a time period longer than the preset time period, the critical enthalpy judgment process is re-entered.

[0026] Furthermore, the indoor return air enthalpy value is compared with the target enthalpy value, including:

[0027] When the indoor return air enthalpy value is greater than the target enthalpy value, the current indoor return air enthalpy value is obtained; the current demand cooling air ratio is obtained according to the current indoor return air enthalpy value and the target enthalpy value; and the pre-adjustment process is entered according to the current demand cooling air ratio;

[0028] When the indoor return air enthalpy value is less than or equal to the target enthalpy value, the fan coil unit is stopped. After the fan coil unit is in the stopped state for a time period greater than a preset time period, the critical enthalpy judgment process is re-entered.

[0029] Further, at least part of the comparison result is a comparison result of the actual temperature at the return air outlet of the fan coil unit and the target temperature value; and controlling the cooling amount and air supply amount of the refrigerant according to at least part of the comparison result includes:

[0030] According to the difference between the actual temperature at the return air outlet of the fan coil unit and the target temperature value, the refrigerant cooling capacity and air supply capacity corresponding to the difference between the actual temperature at the return air outlet of the fan coil unit and the target temperature value are determined to obtain the target regulated cooling capacity and the target regulated air supply capacity;

[0031] The cooling capacity of the refrigerant is adjusted as the target cooling capacity, the air supply is adjusted as the target air supply, and the operation is maintained for a preset stable operation time. After the preset stable operation time is maintained, the critical enthalpy judgment process is entered.

[0032] Furthermore, △T 目标 The difference between the actual temperature at the return air outlet of the fan coil and the target temperature value is used to adjust the cooling capacity of the refrigerant to the target and the air supply to the target, including:

[0033] When △T 目标≤a, so that the cooling capacity of the refrigerant is adjusted to the first target cooling capacity, and the air supply is adjusted to the first target air supply capacity;

[0034] When a<△T 目标 ≤b, the cooling capacity of the refrigerant is adjusted to the second target cooling capacity, and the air supply is adjusted to the second target air supply capacity;

[0035] When b<△T 目标 <c, the cooling capacity of the refrigerant is adjusted to the third target cooling capacity, and the air supply is adjusted to the third target air supply capacity;

[0036] When △T 目标 ≥c, the cooling capacity of the refrigerant is adjusted to the fourth target cooling capacity, and the air supply is adjusted to the fourth target air supply capacity;

[0037] Among them, the first target adjusted cooling capacity is less than the second target adjusted cooling capacity, the second target adjusted cooling capacity is less than the third target adjusted cooling capacity, and the third target adjusted cooling capacity is less than the fourth target adjusted cooling capacity; the first target adjusted air supply volume is the air volume corresponding to the required cooling air ratio and the first target adjusted cooling capacity, the second target adjusted air supply volume is the air volume corresponding to the required cooling air ratio and the second target adjusted cooling capacity, the third target adjusted air supply volume is the air volume corresponding to the required cooling air ratio and the third target adjusted cooling capacity, and the fourth target adjusted air supply volume is the air volume corresponding to the required cooling air ratio and the fourth target adjusted cooling capacity.

[0038] Further, the nth cooling capacity is the fourth cooling capacity; the first target adjusted cooling capacity is the fourth cooling capacity, the second target adjusted cooling capacity is the third cooling capacity, the third target adjusted cooling capacity is the second cooling capacity, and the fourth target adjusted cooling capacity is the first cooling capacity; the first target adjusted air supply volume is the fourth air volume, the second target adjusted air supply volume is the third air volume, the third target adjusted air supply volume is the second air volume, and the fourth target adjusted air supply volume is the first air volume.

[0039] According to another aspect of the present invention, a control device for a fan coil unit is provided, which is used to execute the control method for the fan coil unit provided above. The control device for the fan coil unit includes:

[0040] A first acquisition unit, used for acquiring an indoor return air enthalpy value and a target enthalpy value;

[0041] A second acquisition unit is used to acquire a required cooling air ratio according to the indoor return air enthalpy value and the target enthalpy value;

[0042] The control unit is used to control the air supply of the fan coil unit according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil unit, so that the difference between the real-time cooling air ratio of the fan coil unit and the required cooling air ratio is adjusted to within a preset difference range.

[0043] According to another aspect of the present invention, a non-volatile storage medium is provided, the non-volatile storage medium including a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the fan coil control method provided above.

[0044] According to another aspect of the present invention, a fan coil unit is provided, which is applicable to the control method of the fan coil unit provided above, and the fan coil unit comprises:

[0045] A fan for providing air supply to the fan coil unit; at least a portion of the fan is movably arranged to control the air supply;

[0046] A surface cooler, wherein the surface cooler has a heat exchange pipe for circulating the refrigerant, and the opening of the heat exchange pipe can be adjusted to adjust the cooling capacity of the refrigerant;

[0047] The temperature detection element and the humidity detection element are both arranged at the return air outlet of the fan coil unit.

[0048] Furthermore, the heat exchange pipe comprises:

[0049] The pipeline assembly includes a main pipe and at least two branch pipes spaced apart from each other, one end of the branch pipe is used to be connected to the main pipe, and the other end of the branch pipe is connected to the heat exchange body of the heat exchange pipe;

[0050] The main pipe is used to introduce heat exchange medium, and the main pipe can be selectively connected with each branch pipe.

[0051] Furthermore, the pipeline assembly also includes:

[0052] A first water valve is arranged on the main pipe, the first water valve is located at the connection point between two adjacent branch pipes, and the first water valve can be opened and closed; and / or,

[0053] The second water valve is arranged on the main pipe and located at the ends of at least two branch pipes. The second water valve can be opened and closed.

[0054] According to yet another aspect of the present invention, there is provided an air conditioning system, comprising: the fan coil unit provided above.

[0055] By applying the technical solution of the present invention, by obtaining the indoor return air enthalpy value and the target enthalpy value, the method can accurately calculate the required cold air ratio, and then control the air supply of the fan coil according to the required cold air ratio and the refrigerant cooling capacity of the fan coil. This method ensures that the air supply is compatible with the refrigerant cooling capacity, and the temperature and humidity of the indoor environment can be accurately adjusted to reach the set target value, thereby improving the comfort level. Traditional fan coil control methods often cause excessive cold air ratios under small air volume and large cooling capacity conditions, resulting in excessive dehumidification and indoor dryness. By adjusting the matching of the air supply volume and the refrigerant cooling capacity, the difference between the real-time cold air ratio and the required cold air ratio can be adjusted to within the preset difference range, avoiding this transitional dehumidification phenomenon and improving the user's comfort experience. At the same time, the cold air ratio is accurately controlled to avoid the waste of cooling capacity, so that the air conditioning system can operate in a more efficient manner while meeting the indoor environment requirements, reducing unnecessary energy consumption, and having a significant energy-saving effect. In addition, the method can automatically adjust according to the actual needs of the room, realizing intelligent adjustment and control. This adaptive control method can better cope with the dynamic changes of the indoor environment, reduce human intervention, and improve the automation and response speed of the system. In addition, it can also reduce the fluctuation of the air conditioning system during the adjustment process, avoid the drastic fluctuation of temperature and humidity, and further improve the comfort and stability. Therefore, the technical solution of the present invention can solve the technical problem of poor comfort of fan coil units in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0057] Figure 1 A schematic diagram showing the steps of a method for controlling a fan coil unit according to a first embodiment of the present invention is shown;

[0058] Figure 2 A logic schematic diagram of a fan coil unit control method provided according to Embodiment 1 of the present invention is shown;

[0059] Figure 3 It shows a schematic structural diagram of a fan coil unit provided according to a fourth embodiment of the present invention;

[0060] Figure 4 It shows a schematic structural diagram of a surface cooler of a fan coil unit provided in accordance with a fourth embodiment of the present invention;

[0061] Figure 5 It shows a schematic structural diagram of a fan coil unit surface cooler provided in accordance with a fourth embodiment of the present invention from another perspective;

[0062] Figure 6It shows a schematic structural diagram of a water distributor assembly of a fan coil unit surface cooler according to a fourth embodiment of the present invention;

[0063] Figure 7 A schematic structural diagram of a water collecting head assembly of a surface cooler of a fan coil unit provided in accordance with a fourth embodiment of the present invention is shown.

[0064] The above drawings include the following reference numerals:

[0065] 10. Fan;

[0066] 20. Surface cooler;

[0067] 21. Pipeline components;

[0068] 211. General Manager;

[0069] 212, branch pipe;

[0070] 2121, in charge;

[0071] 213, first water valve;

[0072] 214, second water valve;

[0073] 22. Cover plate;

[0074] 23. First side plate;

[0075] 24. Second side plate;

[0076] 25. Elbow pipe;

[0077] 26. Fins;

[0078] 30. Electrical box;

[0079] 40. Water tray. DETAILED DESCRIPTION

[0080] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0081] like Figure 1 and Figure 2 As shown, embodiment 1 of the present invention provides a control method for a fan coil unit, and the control method for the fan coil unit includes: obtaining an indoor return air enthalpy value and a target enthalpy value; obtaining a required cooling air ratio according to the indoor return air enthalpy value and the target enthalpy value; controlling the air supply volume of the fan coil unit according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil unit, so that the difference between the real-time cooling air ratio of the fan coil unit and the required cooling air ratio is adjusted to within a preset difference range.

[0082] By adopting the control method of the fan coil provided in the first embodiment of the present invention, by obtaining the indoor return air enthalpy value and the target enthalpy value, the method can accurately calculate the required cold air ratio, and then control the air supply of the fan coil according to the required cold air ratio and the refrigerant cooling capacity of the fan coil. This method ensures that the air supply is compatible with the refrigerant cooling capacity, and the temperature and humidity of the indoor environment can be accurately adjusted to reach the set target value, thereby improving the comfort level. The traditional fan coil control method often causes the cold air ratio to be too large under the condition of small air volume and large cooling capacity, resulting in excessive dehumidification and indoor dryness. By adjusting the matching of the air supply volume and the refrigerant cooling capacity, the first embodiment of the present invention can adjust the difference between the real-time cold air ratio and the required cold air ratio to within the preset difference range, thereby avoiding this transitional dehumidification phenomenon and improving the user's comfort experience. At the same time, the cold air ratio is accurately controlled to avoid the waste of cooling capacity, so that the air conditioning system can operate in a more efficient manner while meeting the indoor environment requirements, reducing unnecessary energy consumption, and having a significant energy-saving effect. Moreover, the method can automatically adjust according to the actual needs of the room, realizing intelligent regulation and control. This adaptive control method can better cope with the dynamic changes of the indoor environment, reduce human intervention, and improve the automation and response speed of the system. In addition, it can also reduce the fluctuation of the air-conditioning system during the regulation process, avoid the drastic fluctuation of temperature and humidity, and further improve the comfort and stability. Therefore, the control method of the fan coil unit provided by this embodiment can solve the technical problem of poor comfort of the fan coil unit in the prior art.

[0083] It should be noted that the indoor return air enthalpy value refers to the enthalpy value obtained based on the temperature and humidity at the return air outlet of the fan coil unit. The enthalpy value can be obtained by querying the enthalpy-humidity chart. The cooling air ratio refers to the ratio of the total cooling capacity of the fan coil unit to the hourly air supply volume. The unit of the cooling air ratio is W / (m 3 / h).

[0084] Specifically, the method for obtaining the required cooling air ratio according to the indoor return air enthalpy value and the target enthalpy value includes: according to the indoor return air enthalpy value h 回风 and target enthalpy h 目标 Get the target enthalpy difference △h, △h=h 回风 -h 目标 ; According to the target enthalpy difference △h, the required cooling air ratio corresponding to the target enthalpy difference is obtained.

[0085] Specifically, according to the pre-test, there is a one-to-one correspondence between the target enthalpy difference and the required cold air ratio. The pre-test includes: testing the actual change of the enthalpy difference under different parameters under different cold air ratios through the enthalpy difference test bench, and recording the data table or database as the basic data table library. Specifically, the pre-test also includes: step 1, setting the starting temperature and initial cold air ratio of different temperature and humidity gradients, testing and recording the changes in indoor temperature and humidity over time. Step 2, increasing or decreasing according to a certain cold air ratio gradient and continuing to test, recording the changes in indoor temperature and humidity over time. Step 3, using different refrigerant cooling capacities to test and record them separately, and summarize them into a total table or database. Step 4, according to the relative humidity comfort requirements (40% to 60%) and the total time requirements for stable operation (such as within 10 minutes), determine the appropriate cold air ratio range under each refrigerant cooling capacity, and take a value within the common interval.

[0086] Specifically, the method for controlling the air supply of the fan coil unit according to the required cooling air ratio and the refrigerant cooling capacity of the fan coil unit includes controlling the air supply of the fan coil unit according to the pre-adjustment process; the pre-adjustment process includes: reducing the refrigerant cooling capacity to the first cooling capacity, the second cooling capacity... the nth cooling capacity in sequence; when the refrigerant cooling capacity is running according to the nth cooling capacity, making the air supply capacity the nth air volume corresponding to the required cooling air ratio and the nth cooling capacity, and maintaining the nth operation time. With such a setting, through the pre-adjustment process, the refrigerant cooling capacity and the air supply capacity can be matched in stages according to the required cooling air ratio, ensuring that the air supply capacity accurately corresponds to it under different refrigerant cooling capacities, so as to achieve stable operation of constant cooling air ratio. In addition, such a setting can help the fan coil unit quickly adapt to environmental requirements, first cooling with a larger refrigerant cooling capacity, and then reducing the refrigerant cooling capacity in sequence. Such a setting can reduce energy waste, avoid unnecessary high-power operation, and help reduce overall energy consumption.

[0087] Specifically, the nth running time is greater than or equal to 2 minutes and less than or equal to 10 minutes.

[0088] Specifically, the nth cooling capacity is the fourth cooling capacity. The pre-adjustment process includes: reducing the refrigerant cooling capacity to the first cooling capacity, the second cooling capacity, the third cooling capacity and the fourth cooling capacity in sequence; when the refrigerant cooling capacity is running according to the first cooling capacity, the air supply is the first air volume corresponding to the required cooling air ratio and the first cooling capacity, and the first operation time is maintained. When the refrigerant cooling capacity is running according to the second cooling capacity, the air supply is the second air volume corresponding to the required cooling air ratio and the second cooling capacity, and the second operation time is maintained. When the refrigerant cooling capacity is running according to the third cooling capacity, the air supply is the third air volume corresponding to the required cooling air ratio and the third cooling capacity, and the third operation time is maintained. When the refrigerant cooling capacity is running according to the fourth cooling capacity, the air supply is the fourth air volume corresponding to the required cooling air ratio and the fourth cooling capacity, and the fourth operation time is maintained. With this structural setting, through the pre-adjustment process, the refrigerant cooling capacity and air supply can be matched in stages according to the required cooling air ratio, ensuring that the air supply accurately corresponds to the different refrigerant cooling capacities, so as to achieve stable operation with a constant cooling air ratio. The gradual reduction of the refrigerant cooling capacity from the maximum to the minimum value, combined with the gradual adjustment of the air supply, avoids the impact of sudden and drastic changes on the indoor environment and improves the user experience.

[0089] Specifically, the fan coil unit has j heat exchange tubes arranged in parallel, and the method for reducing the cooling capacity of the refrigerant to the nth cooling capacity includes: opening j-n+1 heat exchange tubes and closing the remaining heat exchange tubes. With such a setting, by controlling the number of heat exchange tubes opened, that is, opening j-n+1 heat exchange tubes and closing the remaining heat exchange tubes, the segmented control of the cooling capacity of the refrigerant is achieved. This control method can more finely adjust the cooling output of the system to adapt to different demand scenarios.

[0090] Specifically, j = 4. The fan coil unit has 4 heat exchange tubes arranged in parallel.

[0091] In this embodiment, after the pre-adjustment process, the control method of the fan coil unit further includes: entering a judgment process, the judgment process includes: comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters to obtain a comparison result; determining whether to enter a fine control process according to the comparison of the comparison result, the fine control process includes: controlling the cooling capacity and air supply of the refrigerant according to at least part of the comparison result; wherein the environmental parameters include at least one of the following: temperature, humidity and enthalpy. With such a setting, after the pre-adjustment process is completed, by comparing the actual environmental parameters at the return air outlet with the set parameters, it can be ensured that the operating state of the current system matches the target parameters set by the user, avoiding over-adjustment or under-adjustment, and ensuring the comfort and stability of the indoor environment. According to the difference in the comparison results, the system can intelligently determine whether it is necessary to enter the fine control process. This mechanism avoids unnecessary system intervention and reduces energy waste. By avoiding unnecessary or invalid fine control processes, the system runs more efficiently, can respond quickly to environmental changes, and maintain low energy consumption. Once it is determined that it is necessary to enter the precise control process, the system can dynamically adjust the refrigerant cooling and air supply according to the current comparison results to ensure that the difference between the real-time cooling air ratio and the required cooling air ratio is within the preset difference range, so as to more accurately meet the real-time needs of the indoor environment, thereby maintaining the indoor temperature and humidity within the preset comfortable range, thereby significantly improving the user experience.

[0092] Specifically, the method for comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters includes: comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters according to a critical enthalpy judgment process, and the critical enthalpy judgment process includes: obtaining the operation mode of the fan coil unit; when the operation mode of the fan coil unit is a cooling mode; when the difference between the indoor return air enthalpy value and the target enthalpy value is less than or equal to a preset enthalpy difference value, comparing the actual temperature at the return air outlet of the fan coil unit with the target enthalpy value; temperature values ​​are compared; when the difference between the indoor return air enthalpy value and the target enthalpy value is greater than the preset enthalpy difference, the indoor return air enthalpy value and the target enthalpy value are compared; when the operation mode of the fan coil unit is the heating mode; when the difference between the indoor return air enthalpy value and the target enthalpy value is greater than the preset enthalpy difference, the actual temperature at the return air outlet of the fan coil unit is compared with the target temperature value; when the difference between the indoor return air enthalpy value and the target enthalpy value is less than or equal to the preset enthalpy difference, the indoor return air enthalpy value and the target enthalpy value are compared. Figure 2K in is the preset enthalpy difference. With this setting, by comparing the difference between the indoor return air enthalpy value and the target enthalpy value and the preset enthalpy difference, precise control of temperature and humidity is achieved, and it can more accurately determine whether the current cooling supply meets the demand, avoiding excessive cooling or heating, thereby reducing energy waste and ensuring the comfort of the indoor environment. In addition, whether in cooling mode or heating mode, the critical enthalpy judgment process can intelligently adjust the refrigerant cooling and air supply according to the current environmental parameters and operating requirements, improving the flexibility and adaptability of the system.

[0093] Specifically, the method for comparing the actual temperature at the return air outlet of the fan coil unit with the target temperature value includes: judging whether the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value; when the operation mode of the fan coil unit is the cooling mode; when the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value, entering the fine control process; when the actual temperature at the return air outlet of the fan coil unit is less than the target temperature value, putting the fan coil unit in a shutdown state, and re-entering the critical enthalpy judgment process after the fan coil unit has been in the shutdown state for a period of time greater than a preset period of time; when the operation mode of the fan coil unit is the heating mode; when the actual temperature at the return air outlet of the fan coil unit is less than the target temperature value, entering the fine control process; when the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value, putting the fan coil unit in a shutdown state, and re-entering the critical enthalpy judgment process after the fan coil unit has been in the shutdown state for a period of time greater than a preset period of time. Figure 2 Ti is the actual temperature at the return air outlet of the fan coil unit, that is, the current temperature at the return air outlet, T 目标 is the target temperature value. This method can effectively avoid temperature over-adjustment, ensure that the indoor temperature is always kept within a comfortable range, avoid discomfort caused by temperature fluctuations, and improve customer satisfaction and work efficiency. In cooling mode, when the actual temperature exceeds the target temperature, the system will enter the fine control process to more accurately control the temperature drop until the target temperature is reached; on the contrary, when the temperature is lower than the target temperature, the system will shut down and restart the judgment process after the preset time m0 to avoid excessive cooling and low temperature. Similarly, in heating mode, the system can intelligently control whether to enter the fine control process or shut down based on the comparison between the actual temperature and the target temperature, ensuring that the indoor temperature will not be too high and maintained in a comfortable range. In addition, the shutdown mechanism is combined with the preset time strategy to reduce the possibility of frequent judgment and switching of the system, and enhance the overall stability and reliability of the system.

[0094] Specifically, the method for comparing the indoor return air enthalpy value with the target enthalpy value includes: when the indoor return air enthalpy value is greater than the target enthalpy value (△h>0), obtaining the current indoor return air enthalpy value; obtaining the current demand cooling air ratio according to the current indoor return air enthalpy value and the target enthalpy value; entering the pre-adjustment process according to the current demand cooling air ratio; when the indoor return air enthalpy value is less than or equal to the target enthalpy value (△h≤0), the fan coil unit is in a shutdown state, and after the fan coil unit is in a shutdown state for a period longer than a preset period, the critical enthalpy judgment process is re-entered. By adopting such a method, by comparing the indoor return air enthalpy value with the target enthalpy value, it is possible to accurately judge whether the temperature and humidity of the indoor environment meet the target requirements, and it is possible to judge whether the pre-adjustment process is adjusted too much or too little, thereby deciding whether to start the pre-adjustment process again or to shut down and wait for a period of time, thereby achieving accurate control of temperature and humidity. And when the indoor return air enthalpy value is greater than the target enthalpy value, the system can intelligently adjust the required cooling air ratio according to the latest test results to maintain the appropriate temperature and humidity of the air and improve comfort. This intelligent control based on enthalpy avoids unnecessary cooling supply, reduces energy waste, and improves the overall energy efficiency of the system.

[0095] In this embodiment, at least part of the comparison result is the comparison result of the actual temperature at the return air outlet of the fan coil unit and the target temperature value. The method for controlling the refrigerant cooling capacity and air supply according to at least part of the comparison result includes: according to the difference between the actual temperature at the return air outlet of the fan coil unit and the target temperature value, determining the refrigerant cooling capacity and air supply corresponding to the difference between the actual temperature at the return air outlet of the fan coil unit and the target temperature value, so as to obtain the target adjustment cooling capacity and the target adjustment air supply; making the refrigerant cooling capacity the target adjustment cooling capacity, the air supply capacity the target adjustment air supply, and maintaining the preset stable operation time, and entering the critical enthalpy judgment process after maintaining the preset stable operation time. With such a method, according to the difference between the actual temperature and the target temperature, the system can dynamically adjust the refrigerant cooling capacity and the corresponding air supply, so as to ensure that the indoor environment quickly and stably reaches the target setting value. The system can accurately determine the target cooling capacity and target air supply according to the temperature difference, so that the difference between the real-time cooling ratio and the required cooling ratio is within the preset difference range, thereby improving the adjustment efficiency and reducing energy waste. In addition, after the system reaches the target cooling capacity and target air supply, it will run for the preset stable operation time, so that the environmental parameters can be stabilized, and then the next step of judgment and control can be carried out, which improves the stability of the system and user experience.

[0096] Specifically, △T 目标 is the difference between the actual temperature at the return air outlet of the fan coil and the target temperature value. The method of adjusting the cooling capacity and the air supply to the target includes: when △T 目标≤a, the cooling capacity of the refrigerant is adjusted to the first target cooling capacity, and the air supply is adjusted to the first target air supply; when a<△T 目标 ≤b, the cooling capacity of the refrigerant is adjusted to the second target cooling capacity, and the air supply is adjusted to the second target air supply; when b<△T 目标 <c, the cooling capacity of the refrigerant is adjusted to the third target cooling capacity, and the air supply is adjusted to the third target air supply; when △T 目标 ≥c, so that the cooling amount of the refrigerant is the fourth target regulated cooling amount, and the air supply is the fourth target regulated air supply; wherein, the first target regulated cooling amount is less than the second target regulated cooling amount, the second target regulated cooling amount is less than the third target regulated cooling amount, and the third target regulated cooling amount is less than the fourth target regulated cooling amount; the first target regulated air supply amount is the air volume corresponding to the required cooling air ratio and the first target regulated cooling amount, the second target regulated air supply amount is the air volume corresponding to the required cooling air ratio and the second target regulated cooling amount, the third target regulated air supply amount is the air volume corresponding to the required cooling air ratio and the third target regulated cooling amount, and the fourth target regulated air supply amount is the air volume corresponding to the required cooling air ratio and the fourth target regulated cooling amount. By adopting such a method and such a segmented control strategy, rapid response and stable control of the indoor environment can be achieved, which is suitable for scenes requiring refined temperature control.

[0097] Specifically, the nth cooling capacity is the fourth cooling capacity; the first target cooling capacity is the fourth cooling capacity, the second target cooling capacity is the third cooling capacity, the third target cooling capacity is the second cooling capacity, and the fourth target cooling capacity is the first cooling capacity; the first target air supply is the fourth air volume, the second target air supply is the third air volume, the third target air supply is the second air volume, and the fourth target air supply is the first air volume. In this way, the system can automatically adjust to the required target cooling capacity and air supply according to the current environmental parameters and the required cooling air ratio. This adaptive adjustment capability enables the air conditioning system to better cope with the dynamic changes of the indoor environment and improves the flexibility and response speed of the system. By accurately matching the cooling capacity of the refrigerant and the air supply, the phenomenon of small air volume and large cooling capacity commonly seen in traditional air conditioning systems is avoided, the waste of cooling capacity is reduced, thereby achieving more efficient energy utilization and improving the overall energy efficiency of the system.

[0098] Specifically, the fan coil control method further includes: detecting the indoor temperature T 回干 and wet bulb temperature T 回湿 , according to the indoor temperature T 回干 and wet bulb temperature T 回湿 Get the indoor return air enthalpy value. Indoor temperature T 回干 Specifically, it is the maximum temperature at the return air outlet of the fan coil unit, the wet bulb temperature T 回湿 Specifically, it is the maximum wet bulb temperature at the return air outlet of the fan coil unit.

[0099] Specifically, the fan coil control method further includes: setting a target temperature T 设干 , relative humidity ψ 设 Or wet bulb temperature T 设湿 , according to the target temperature T 设干 , relative humidity ψ 设 Or wet bulb temperature T 设湿 Determine the target enthalpy value.

[0100] Embodiment 2 of the present invention provides a control device for a fan coil unit, and the control device of the fan coil unit is used to execute the control method of the fan coil unit provided in Embodiment 1. The control device of the fan coil unit includes a first acquisition unit, a second acquisition unit and a control unit. The first acquisition unit is used to acquire the indoor return air enthalpy value and the target enthalpy value; the second acquisition unit is used to acquire the required cooling air ratio according to the indoor return air enthalpy value and the target enthalpy value; the control unit is used to control the air supply volume of the fan coil unit according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil unit, so that the difference between the real-time cooling air ratio of the fan coil unit and the required cooling air ratio is adjusted to within a preset difference range.

[0101] By adopting the control device of the fan coil unit provided in the second embodiment of the present invention, by obtaining the indoor return air enthalpy value and the target enthalpy value, the method can accurately calculate the required cold air ratio, and then control the air supply of the fan coil unit according to the required cold air ratio and the refrigerant cooling capacity of the fan coil unit. This method ensures that the air supply volume is adapted to the refrigerant cooling capacity, and the temperature and humidity of the indoor environment can be accurately adjusted to reach the set target value, thereby improving the comfort level. The traditional fan coil unit control method often causes the cold air ratio to be too large under the condition of small air volume and large cooling capacity, resulting in excessive dehumidification and indoor dryness. By adjusting the matching of the air supply volume and the refrigerant cooling capacity, the second embodiment of the present invention can adjust the difference between the real-time cold air ratio and the required cold air ratio to within the preset difference range, thereby avoiding this transitional dehumidification phenomenon and improving the user's comfort experience. At the same time, the cold air ratio is accurately controlled to avoid the waste of cooling capacity, so that the air conditioning system can operate in a more efficient manner while meeting the indoor environment requirements, reducing unnecessary energy consumption, and having a significant energy-saving effect. Moreover, the method can automatically adjust according to the actual needs of the room, realizing intelligent regulation and control. This adaptive control method can better cope with the dynamic changes of the indoor environment, reduce human intervention, and improve the automation and response speed of the system. In addition, it can also reduce the fluctuation of the air-conditioning system during the regulation process, avoid the drastic fluctuation of temperature and humidity, and further improve the comfort and stability. Therefore, the control device of the fan coil unit provided by this embodiment can solve the technical problem of poor comfort of the fan coil unit in the prior art.

[0102] Embodiment 3 of the present invention provides a non-volatile storage medium, the non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the fan coil control method provided in embodiment 1.

[0103] like Figures 3 to 7 As shown, embodiment 4 of the present invention provides a fan coil unit, which is applicable to the control method of the fan coil unit provided in embodiment 1, and the fan coil unit includes a fan 10, a cooler 20, a temperature detector and a humidity detector. The fan 10 is used to provide the air supply of the fan coil unit, and at least part of the fan 10 is movably arranged to control the air supply. The cooler 20 has a heat exchanger exhaust pipe for circulating the refrigerant, and the opening of the heat exchanger exhaust pipe can be adjusted to adjust the cooling capacity of the refrigerant. The temperature detector and the humidity detector are both arranged at the return air outlet of the fan coil unit.

[0104] By using the fan coil provided by the fourth embodiment of the present invention, the air supply volume can be controlled by the fan 10 and the refrigerant supply volume can be controlled by the surface cooler 20 according to the detection results of the temperature detection element and the humidity detection element, so that the air supply volume and the refrigerant supply volume are adapted to the required cold air ratio, and then the temperature and humidity of the indoor environment can be accurately adjusted and reach the set target value, thereby improving the comfort. The traditional fan coil control method often causes the cold air ratio to be too large under the condition of small air volume and large cold air, resulting in excessive dehumidification and indoor dryness. This fourth embodiment adjusts the matching of the air supply volume and the refrigerant supply volume, so that the difference between the real-time cold air ratio and the required cold air ratio can be adjusted to within the preset difference range, avoiding this transitional dehumidification phenomenon and improving the user's comfort experience. At the same time, the cold air ratio is accurately controlled to avoid the waste of cold air, so that the air conditioning system can operate in a more efficient manner while meeting the indoor environment requirements, reducing unnecessary energy consumption, and having a significant energy-saving effect. In addition, the method can automatically adjust according to the actual needs of the room, realizing intelligent adjustment and control. This adaptive control method can better cope with the dynamic changes of the indoor environment, reduce human intervention, and improve the automation and response speed of the system. In addition, it can also reduce the fluctuation of the air conditioning system during the adjustment process, avoid the drastic fluctuation of temperature and humidity, and further improve the comfort and stability. Therefore, the fan coil unit provided by this embodiment can solve the technical problem of poor comfort of fan coil units in the prior art.

[0105] Specifically, the heat exchanger exhaust pipe includes a pipeline assembly 21, which includes a main pipe 211 and at least two branch pipes 212 spaced apart from each other, one end of the branch pipe 212 is used to communicate with the main pipe 211, and the other end of the branch pipe 212 is connected to the heat exchange body of the heat exchanger exhaust pipe. The main pipe 211 is used to pass the heat exchange medium, and the main pipe 211 can be selectively connected to each branch pipe 212. With such a structural setting, the pipeline assembly 21 consists of a main pipe 211 and at least two branch pipes 212 spaced apart from each other. This design makes the structure of the surface cooler 20 clearer, convenient for installation and maintenance, and also increases the flexibility of controlling the cooling capacity of the refrigerant. The optional connectivity between the main pipe 211 and the branch pipe 212 means that the system can dynamically control the refrigerant flow of the heat exchanger exhaust pipe according to actual needs, thereby accurately adjusting the cooling capacity of the refrigerant, improving the energy efficiency of the air-conditioning system and user comfort.

[0106] Specifically, the pipeline assembly 21 also includes a first water valve 213, and the first water valve 213 is arranged on the main pipe 211. The first water valve 213 is located at the connection point of two adjacent branch pipes 212, and the first water valve 213 can be opened and closed. With such a structural arrangement, the refrigerant flow between the main pipe 211 and the heat exchange body of the heat exchange exhaust pipe can be accurately controlled, thereby avoiding the waste of refrigerant and improving the adjustment accuracy of the refrigerant supply. The openable and closable design of the first water valve 213 enables the system to adjust the number of branch pipes 212 connected to the main pipe 211 in real time according to the current cooling demand, thereby controlling the refrigerant supply, enhancing the adjustment ability and flexibility of the system, and being able to quickly respond to changes in the indoor environment. Figure 4 and Figure 5 As shown, the dotted lines in the figure indicate the flow of the refrigerant in the branch pipe 212 connected to the main pipe 211.

[0107] Specifically, the pipeline assembly 21 also includes a second water valve 214, which is arranged on the main pipe 211 and located at the ends of at least two branch pipes 212, and the second water valve 214 can be opened and closed. With such a structural arrangement, the inlet and outlet of the refrigerant can be more accurately controlled, the ineffective flow of the refrigerant can be prevented, and the energy efficiency of the system is improved. The openable and closable characteristics of the second water valve 214 increase the control dimension of the system over the refrigerant flow, meeting the needs under different environmental conditions.

[0108] Specifically, there are two second water valves 214, one of which is located at one end of at least two branch pipes 212, and the other is located at the other end of at least two branch pipes 212. One end of the main pipe 211 is used to pass the refrigerant medium, and the other end of the main pipe 211 is used to pass the heating medium. The two second water valves 214 are used to control the passage of the refrigerant medium and the passage of the heating medium, respectively.

[0109] Specifically, there are four branch pipes 212, and the surface cooler 20 also includes three first water valves 213. With such a structural setting, the number of branch pipes 212 is set to four, and with the three first water valves 213, a graded adjustment structure is formed, which can achieve segmented control from maximum cooling capacity to minimum cooling capacity, thereby enhancing the adjustment range and accuracy of the system. This structural design enables the system to more accurately match the cooling capacity and air supply of the refrigerant, avoiding the problem of excess or insufficient cooling capacity in traditional air-conditioning systems, and improving the comfort and energy-saving effect of indoor environment adjustment. Specifically, the four branch pipes 212 form the aforementioned four heat exchange tubes arranged in parallel.

[0110] Specifically, the branch pipe 212 includes at least two branch pipes 2121, one end of the branch pipe 2121 is used to communicate with the main pipe 211, and the other end of the branch pipe 2121 is connected to the heat exchange body of the heat exchange pipe. With such a structural setting, the refrigerant can be more evenly distributed to the heat exchange body of the heat exchange pipe, thereby improving the heat exchange efficiency and ensuring the uniform release of the cooling capacity. The branch pipe design reduces the pressure loss of the refrigerant in the process of flowing through the surface cooler 20, improves the utilization efficiency of the refrigerant, thereby reducing energy consumption and achieving the goal of energy saving and environmental protection.

[0111] Specifically, there are at least two pipeline assemblies 21, one of the at least two pipeline assemblies 21 is used to collect and discharge the heat exchange medium, and the other of the at least two pipeline assemblies 21 is used to divert the heat exchange medium in the main pipe 211 to the heat exchange body of the heat exchange exhaust pipe. Such a structural setting ensures the stability of the refrigerant circulation and avoids local accumulation of the refrigerant in the system. The multi-component pipeline design optimizes the distribution of the refrigerant in the heat exchange exhaust pipe and improves the utilization efficiency of the refrigerant, thereby achieving faster and more accurate cooling capacity regulation and improving the overall operating efficiency of the air-conditioning system. Specifically, there are two pipeline assemblies 21, one of the two pipeline assemblies 21 is a water distribution head assembly and the other is a water collection head assembly.

[0112] In this embodiment, the fan coil unit further includes an electrical box 30, which includes electrical components such as a controller for controlling the fan 10 and the surface cooler 20. The fan coil unit further includes a water receiving pan 40, which is located below the surface cooler 20 and is used to collect condensed water, thereby keeping the inside of the fan coil unit dry and preventing mold from growing.

[0113] Specifically, the cooler 20 further includes a cover plate 22, a first side plate 23, a second side plate 24, an elbow pipe 25 and fins 26. The cover plate 22 is located above the cooler 20 and is used to close one side of the cooler 20. The first side plate 23 and the second side plate 24 are respectively located on both sides of the cooler 20. Their main functions are to support and close the cooler 20, ensure the stability of the structure and prevent refrigerant leakage. The elbow pipe 25 forms a part of the heat exchange body of the heat exchange pipe and is used to communicate with the branch pipe 2121. The fins 26 are fixed on the heat exchange pipe of the cooler 20, which increases the heat exchange area and improves the heat exchange efficiency.

[0114] Embodiment 5 of the present invention provides an air conditioning system, and the air conditioning system includes the fan coil unit provided in embodiment 4.

[0115] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the air supply volume and the cooling volume of the refrigerant of the system are controlled in sections, so that the cold air ratio can be controlled within a smaller and more reasonable range, avoiding the situation of small air volume and large cooling volume. The air conditioning system is realized in the process of adjustment, while maintaining a constant cold air ratio, and regulating the indoor demand with a gradual gradient wind gear, so that the comfort experience in the whole adjustment process is stable and reasonable, and because it does not participate in excessive dehumidification, the latent heat loss caused by it is avoided.

[0116] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0117] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0118] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0119] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0120] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for a fan coil unit, characterized in that: include: Obtain indoor return air enthalpy value and target enthalpy value; Obtaining a required cooling air ratio according to the indoor return air enthalpy value and the target enthalpy value; The air supply volume of the fan coil unit is controlled according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil unit, so that the difference between the real-time cooling air ratio of the fan coil unit and the required cooling air ratio is adjusted to within a preset difference range.

2. The fan coil control method according to claim 1, characterized in that: The air supply volume of the fan coil unit is controlled according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil unit, including controlling the air supply volume of the fan coil unit according to a pre-adjustment process; the pre-adjustment process includes: The cooling capacity of the refrigerant is sequentially reduced to a first cooling capacity, a second cooling capacity, ... an nth cooling capacity; In a state where the refrigerant cooling capacity is operated according to the nth cooling capacity, the air supply capacity is set to an nth air capacity corresponding to the required cooling air ratio and the nth cooling capacity, and the nth operation time is maintained.

3. The fan coil control method according to claim 2, characterized in that: The nth cooling capacity is the fourth cooling capacity; and / or, The fan coil unit has j heat exchange tubes arranged in parallel, and reducing the cooling capacity of the refrigerant to the nth cooling capacity includes: opening j-n+1 of the heat exchange tubes and closing the remaining heat exchange tubes.

4. The control method of the fan coil unit according to claim 2, characterized in that: After the pre-adjustment process, the fan coil control method further includes: Entering into a judgment process, the judgment process includes: comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters to obtain a comparison result; Determining whether to enter a fine control process according to the comparison result, the fine control process comprising: controlling the cooling amount of the refrigerant and the air supply amount according to at least part of the comparison result; Wherein, the environmental parameters include at least one of the following: temperature, humidity and enthalpy.

5. The control method of the fan coil unit according to claim 4, characterized in that: The comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters includes: comparing the actual environmental parameters at the return air outlet of the fan coil unit with the set parameters according to a critical enthalpy judgment process, and the critical enthalpy judgment process includes: Obtaining the operation mode of the fan coil unit; In the case where the operation mode of the fan coil unit is the cooling mode; when the difference between the indoor return air enthalpy value and the target enthalpy value is less than or equal to the preset enthalpy difference value, the actual temperature at the return air outlet of the fan coil unit is compared with the target temperature value; when the difference between the indoor return air enthalpy value and the target enthalpy value is greater than the preset enthalpy difference value, the indoor return air enthalpy value is compared with the target enthalpy value; When the operation mode of the fan coil unit is the heating mode; when the difference between the indoor return air enthalpy value and the target enthalpy value is greater than the preset enthalpy difference, the actual temperature at the return air outlet of the fan coil unit is compared with the target temperature value; when the difference between the indoor return air enthalpy value and the target enthalpy value is less than or equal to the preset enthalpy difference, the indoor return air enthalpy value is compared with the target enthalpy value.

6. The control method of the fan coil unit according to claim 5, characterized in that: The comparing the actual temperature at the return air outlet of the fan coil unit with the target temperature value comprises: Determining whether the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value; In the case where the operation mode of the fan coil unit is the cooling mode; when the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value, the fine control process is entered; when the actual temperature at the return air outlet of the fan coil unit is less than the target temperature value, the fan coil unit is put into a shutdown state, and after the fan coil unit is in the shutdown state for a time period greater than a preset time period, the critical enthalpy judgment process is re-entered; When the operation mode of the fan coil unit is the heating mode; when the actual temperature at the return air outlet of the fan coil unit is less than the target temperature value, the fine control process is entered; when the actual temperature at the return air outlet of the fan coil unit is greater than or equal to the target temperature value, the fan coil unit is put into a shutdown state, and after the fan coil unit is in the shutdown state for a time period greater than a preset time period, the critical enthalpy judgment process is re-entered.

7. The control method of the fan coil unit according to claim 5, characterized in that: The comparing the indoor return air enthalpy value with the target enthalpy value comprises: When the indoor return air enthalpy value is greater than the target enthalpy value, obtaining the current indoor return air enthalpy value; obtaining the current required cooling air ratio according to the current indoor return air enthalpy value and the target enthalpy value; and entering the pre-adjustment process according to the current required cooling air ratio; When the indoor return air enthalpy value is less than or equal to the target enthalpy value, the fan coil unit is put into a shutdown state. After the fan coil unit is in the shutdown state for a time period longer than a preset time period, the critical enthalpy judgment process is re-entered.

8. The control method of the fan coil unit according to claim 5, characterized in that: At least part of the comparison result is a comparison result between the actual temperature at the return air outlet of the fan coil unit and the target temperature value; The controlling the cooling amount of the refrigerant and the air supply amount according to at least part of the comparison result includes: According to the difference between the actual temperature at the return air outlet of the fan coil unit and the target temperature value, determine the refrigerant cooling capacity and the air supply capacity corresponding to the difference between the actual temperature at the return air outlet of the fan coil unit and the target temperature value, so as to obtain the target regulated cooling capacity and the target regulated air supply capacity; The cooling capacity of the refrigerant is set to the target regulated cooling capacity, the air supply is set to the target regulated air supply, and the operation is maintained for a preset stable operation time. After the preset stable operation time is maintained, the critical enthalpy judgment process is entered.

9. The fan coil control method according to claim 8, characterized in that: △T 目标 is the difference between the actual temperature at the return air outlet of the fan coil unit and the target temperature value, and making the cooling amount of the refrigerant the target regulated cooling amount and the air supply amount the target regulated air supply amount, including: When △T 目标 ≤a, so that the cooling capacity of the refrigerant is the first target regulated cooling capacity, and the air supply capacity is the first target regulated air supply capacity; When a<△T 目标 ≤b, so that the cooling capacity of the refrigerant is the second target regulated cooling capacity, and the air supply capacity is the second target regulated air supply capacity; When b<△T 目标 <c, making the cooling capacity of the refrigerant the third target regulated cooling capacity, and making the air supply capacity the third target regulated air supply capacity; When △T 目标 ≥c, the cooling capacity of the refrigerant is adjusted to the fourth target cooling capacity, and the air supply is adjusted to the fourth target air supply; Among them, the first target regulated cooling amount is less than the second target regulated cooling amount, the second target regulated cooling amount is less than the third target regulated cooling amount, and the third target regulated cooling amount is less than the fourth target regulated cooling amount; the first target regulated air supply volume is the air volume corresponding to the required cooling air ratio and the first target regulated cooling amount, the second target regulated air supply volume is the air volume corresponding to the required cooling air ratio and the second target regulated cooling amount, the third target regulated air supply volume is the air volume corresponding to the required cooling air ratio and the third target regulated cooling amount, and the fourth target regulated air supply volume is the air volume corresponding to the required cooling air ratio and the fourth target regulated cooling amount.

10. The fan coil control method according to claim 9, characterized in that: The nth cooling capacity is the fourth cooling capacity; the first target adjusted cooling capacity is the fourth cooling capacity, the second target adjusted cooling capacity is the third cooling capacity, the third target adjusted cooling capacity is the second cooling capacity, and the fourth target adjusted cooling capacity is the first cooling capacity; the first target adjusted air supply volume is the fourth air volume, the second target adjusted air supply volume is the third air volume, the third target adjusted air supply volume is the second air volume, and the fourth target adjusted air supply volume is the first air volume.

11. A control device for a fan coil unit, characterized in that: A control method for a fan coil unit according to any one of claims 1 to 10, wherein the control device for the fan coil unit comprises: A first acquisition unit, used for acquiring an indoor return air enthalpy value and a target enthalpy value; a second acquisition unit, configured to acquire a required cooling air ratio according to the indoor return air enthalpy value and the target enthalpy value; A control unit is used to control the air supply volume of the fan coil unit according to the required cooling air ratio and the cooling capacity of the refrigerant of the fan coil unit, so that the difference between the real-time cooling air ratio of the fan coil unit and the required cooling air ratio is adjusted to within a preset difference range.

12. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the fan coil unit control method according to any one of claims 1 to 10.

13. A fan coil unit, characterized in that: A control method for a fan coil unit according to any one of claims 1 to 10, wherein the fan coil unit comprises: A fan (10) is used to provide an air supply volume for the fan coil unit; at least a portion of the fan (10) is movably arranged to control the air supply volume; A surface cooler (20), wherein the surface cooler (20) has a heat exchange pipe for circulating a refrigerant, and the opening of the heat exchange pipe is adjustable to adjust the cooling capacity of the refrigerant; The temperature detection element and the humidity detection element are both arranged at the return air outlet of the fan coil unit.

14. The fan coil unit according to claim 13, characterized in that: The heat exchange pipe comprises: A pipeline assembly (21) comprises a main pipe (211) and at least two branch pipes (212) arranged at intervals from each other, one end of the branch pipe (212) being used to communicate with the main pipe (211), and the other end of the branch pipe (212) being connected to a heat exchange body of the heat exchange exhaust pipe; The main pipe (211) is used to pass heat exchange medium, and the main pipe (211) can be selectively connected to each of the branch pipes (212).

15. The fan coil unit according to claim 14, characterized in that: The pipeline assembly (21) further comprises: a first water valve (213) disposed on the main pipe (211), the first water valve (213) being located at the connecting point between two adjacent branch pipes (212), the first water valve (213) being openable and closable; and / or, The second water valve (214) is arranged on the main pipe (211) and located at the ends of the at least two branch pipes (212). The second water valve (214) can be opened and closed.

16. An air conditioning system, characterized in that: include: The fan coil unit according to any one of claims 13 to 15.

Images