Fan-coil control method and device and fan-coil

Abstract

The application discloses a fan-coil control method and device and a fan-coil, and the method comprises the following steps: determining the initial opening group number of the cooling coil, controlling the opening of the cooling coil according to the initial opening group number, and adjusting the indoor temperature where the fan-coil is located; detecting the indoor humidity where the fan-coil is located after the indoor temperature is adjusted; determining the operation mode of the fan-coil according to the indoor humidity, and controlling the operation of the fan-coil according to the operation mode; wherein the operation mode at least comprises a heat and humidity preservation mode and a humidity preservation mode. The application solves the problems in the prior art that the operation mode of the conventional fan-coil is fixed after selection, the cold quantity range is narrow, the humidity cannot be adjusted, and the scene adaptability is weak, and the temperature and humidity are adjusted, so that the application is suitable for different application scenes, and the scene applicability and user comfort of the fan-coil are improved.

Description

Technical Field

[0001] This invention relates to the field of fan coil unit technology, and more specifically, to a fan coil unit control method, device, and fan coil unit. Background Technology

[0002] Fan coil units, also known as fan coil units, are terminal products of commercial air conditioning systems used to regulate indoor environmental comfort (temperature and humidity) and are widely used in commercial buildings.

[0003] Currently, fan coil units commonly come in two, three, or four rows of surface cooler coils. The choice of fan coil unit based on local ambient temperature and occupancy density is crucial. The cooling and dehumidification capacities vary significantly between different rows of surface cooler coils, with cooling and dehumidification capacities increasing sequentially from two-row to three-row to four-row. However, once the number of surface cooler coil rows is fixed, humidity cannot be adjusted. Selecting based on the number of rows can easily lead to over-dehumidification, affecting comfort and resulting in resource waste and increased operating costs. Conversely, selecting based on the number of rows results in slow cooling efficiency, a poor user experience, and weak adaptability to various scenarios.

[0004] There is currently no effective solution to the problems of conventional fan coil units having fixed operating modes after selection, narrow cooling capacity range, inability to adjust humidity, and weak adaptability to different scenarios. Summary of the Invention

[0005] This invention provides a fan coil control method, device, and fan coil unit to at least solve the problems of fixed operating modes, narrow cooling capacity range, inability to adjust humidity, and weak adaptability of conventional fan coil units in the prior art after selection.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, a fan coil unit control method is provided, applied to a fan coil unit. The fan coil unit includes: a surface cooler assembly and an adjustable manifold. The surface cooler assembly includes multiple sets of surface cooler coils. The adjustable manifold is connected to the multiple sets of surface cooler coils for controlling the number of surface cooler coils that are turned on. The method includes: determining an initial number of surface cooler coils to be turned on; controlling the surface cooler coils to be turned on according to the initial number of coils to adjust the indoor temperature where the fan coil unit is located; after the indoor temperature is adjusted, detecting the indoor humidity where the fan coil unit is located; determining an operating mode of the fan coil unit based on the indoor humidity; and controlling the operation of the fan coil unit according to the operating mode. The operating mode includes at least: a heat preservation and humidity control mode and a humidity control mode.

[0007] Further, determining the initial number of activated coil groups for the surface cooler includes: acquiring the user's set temperature and the current indoor temperature; wherein the current indoor temperature is the dry-bulb temperature; calculating the temperature difference between the current indoor temperature and the set temperature; and determining the initial number of activated coil groups for the surface cooler based on the temperature difference.

[0008] Further, determining the initial number of operating groups of the surface cooler coil based on the temperature difference includes: obtaining the required cooling capacity corresponding to the temperature difference; determining the initial number of operating groups of the surface cooler coil based on the required cooling capacity; wherein, a cooling capacity adjustment range corresponding to different numbers of operating groups of the surface cooler coil is preset.

[0009] Furthermore, after controlling the cooling coil to start according to the initial number of start groups, the method further includes: after the cooling coil has been started for a first preset time, detecting the current indoor temperature and determining whether the current indoor temperature has reached the set temperature; if so, determining that the indoor temperature adjustment is complete; otherwise, if the current indoor temperature is greater than the set temperature, re-determining the initial number of start groups of the cooling coil; if the current indoor temperature is less than the set temperature, controlling the fan coil to stop for a second preset time and then re-determining the initial number of start groups of the cooling coil.

[0010] Further, determining the operating mode of the fan coil unit based on the indoor humidity includes: acquiring the user's set humidity and the current indoor humidity; when the set humidity is greater than the current indoor humidity, determining the operating mode as the heat preservation and humidity humidification mode; when the set humidity is not greater than the current indoor humidity, determining the operating mode as the humidity humidification mode.

[0011] Furthermore, controlling the operation of the fan coil unit according to the operating mode includes: when the operating mode is the heat preservation and humidity control mode, obtaining the air enthalpy difference between the current air enthalpy value and the target air enthalpy value in the room where the fan coil unit is located, and adjusting the number of opening groups of the surface cooler coil according to the air enthalpy difference to adjust the indoor temperature and the indoor humidity; when the operating mode is the humidity control mode, obtaining the required cooling capacity of the fan coil unit, determining the minimum number of opening groups of the surface cooler coil to meet the required cooling capacity, and controlling the opening of the surface cooler coil according to the minimum number of opening groups.

[0012] Further, adjusting the number of operating groups of the surface cooler coils according to the air enthalpy difference includes: obtaining the enthalpy operating range corresponding to different numbers of the surface cooler coils; wherein the enthalpy operating ranges corresponding to two adjacent groups of the surface cooler coils overlap; determining whether the air enthalpy difference is within the overlapping range; if so, controlling the surface cooler coils to open according to the energy-saving mode; otherwise, controlling the surface cooler coils to open according to the number of groups of the surface cooler coils corresponding to the air enthalpy difference.

[0013] Furthermore, controlling the opening of the surface cooler coil according to the energy-saving mode includes: comparing the energy efficiency values ​​of the two groups of surface cooler coils corresponding to the overlapping range; and controlling the opening of the surface cooler coil according to the number of groups of surface cooler coils with the lower energy efficiency value.

[0014] According to another aspect of the present invention, a fan coil unit control device is provided, applied to a fan coil unit, the fan coil unit comprising: a surface cooler assembly and an adjustable manifold, the surface cooler assembly comprising multiple sets of surface cooler coils, the adjustable manifold being connected to the multiple sets of surface cooler coils for controlling the number of surface cooler coils in operation; the device comprising: a determining module for determining the initial number of sets of surface cooler coils in operation, and controlling the surface cooler coils to be in operation according to the initial number of sets in operation to adjust the indoor temperature where the fan coil unit is located; a detecting module for detecting the indoor humidity where the fan coil unit is located after the indoor temperature has been adjusted; and a controlling module for determining the operating mode of the fan coil unit based on the indoor humidity, and controlling the operation of the fan coil unit according to the operating mode; wherein the operating mode includes at least: a heat preservation and humidity control mode and a humidity control mode.

[0015] According to another aspect of the present invention, a fan coil unit is provided, including the fan coil unit control device as described above.

[0016] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the fan coil control method as described above.

[0017] This invention provides a fan coil unit control scheme applied to fan coil units with adjustable surface cooler assemblies. First, the initial number of operating groups of the surface cooler coils is determined, and the coils are controlled to operate according to this initial number to regulate the indoor temperature where the fan coil unit is located. After the indoor temperature is regulated, the indoor humidity is detected, and the operating mode of the fan coil unit is determined based on the humidity. The fan coil unit is then controlled to operate according to this operating mode. This operating mode includes at least a heat preservation and humidity control mode and a humidity control mode to simultaneously address both temperature and humidity requirements, or minimize humidity fluctuations. Through this scheme of adjusting the number of operating groups of the surface cooler coils, tiered regulation is achieved. This not only results in more reasonable regulation but also considers both temperature and humidity control. Furthermore, different operating modes are available to suit various application scenarios, improving the fan coil unit's adaptability and user comfort. This effectively solves the problems of fixed operating modes, narrow cooling capacity range, and inability to adjust humidity, as well as weak scenario adaptability, inherent in conventional fan coil units in the prior art. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an optional structure of a fan coil unit according to an embodiment of the present invention;

[0019] Figure 2 This is an optional flowchart of a fan coil unit control method according to an embodiment of the present invention;

[0020] Figure 3 This is an optional schematic diagram showing the cooling capacity operating range corresponding to different numbers of rows of fan coil units according to an embodiment of the present invention;

[0021] Figure 4 This is an optional schematic diagram showing the enthalpy operating range corresponding to different numbers of surface cooler coils according to an embodiment of the present invention;

[0022] Figure 5 This is another optional flowchart of the fan coil control method according to an embodiment of the present invention;

[0023] Figure 6 This is an optional structural block diagram of a fan coil unit control device according to an embodiment of the present invention. Detailed Implementation

[0024] 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. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0026] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0027] It should be understood that although the terms first, second, third, etc., may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0028] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0029] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0030] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Example 1

[0031] In a preferred embodiment of the present invention, a fan coil unit control method is provided. This control method can be directly applied to the fan coil unit. The fan coil unit includes a surface cooler assembly and an adjustable manifold. The surface cooler assembly includes multiple sets of surface cooler coils. The adjustable manifold is connected to the multiple sets of surface cooler coils and is used to control the number of surface cooler coils that are turned on.

[0032] Figure 1 This diagram illustrates one possible structural design of the fan coil unit, such as... Figure 1 As shown, the fan coil unit consists of a fan component, an electrical box, a surface cooler assembly, and an adjustable manifold. The surface cooler assemblies can be arranged in rows, with each row forming a group. The adjustable manifold is equipped with valves 1 to 8. As shown in the right figure, a branch pipe is installed between every two valves at the inlet and outlet. By adjusting the opening and closing of these valves, the number of operating rows of the surface cooler can be freely switched.

[0033] When valves 1-2 are open and the rest are closed, the rightmost row of surface coolers operates with water, which is the start of the first row of surface cooler coils as described later; when valves 1-4 are open and the rest are closed, the rightmost two rows of surface coolers operate with water, which is the start of the second row of surface cooler coils as described later; when valves 1-6 are open and the rest are closed, the rightmost three rows of surface coolers operate with water, which is the start of the third row of surface cooler coils as described later; when valves 1-8 are open and the rest are closed, all surface coolers operate with water, which is the start of the fourth row of surface cooler coils as described later.

[0034] Based on the above-mentioned fan coil unit, a preferred embodiment 1 of the present invention provides a fan coil unit control method, which is applied to the above-mentioned fan coil unit.

[0035] Specifically Figure 2 An optional flowchart of the method is shown, such as Figure 2 As shown, the method includes the following steps S202-S206:

[0036] S202: Determine the initial number of open groups of the surface cooler coils, and control the opening of the surface cooler coils according to the initial number of open groups to adjust the indoor temperature where the fan coil unit is located.

[0037] S204: After the indoor temperature is adjusted, check the indoor humidity where the fan coil unit is located;

[0038] S206: Determine the operating mode of the fan coil unit based on the indoor humidity, and control the operation of the fan coil unit according to the operating mode; wherein, the operating mode includes at least: heat preservation and humidity mode and humidity mode.

[0039] In the above embodiments, a fan coil unit control scheme is provided, applied to fan coil units with adjustable surface cooler assemblies. First, the initial number of operating groups of the surface cooler coils is determined, and the coils are controlled to operate according to this initial number to regulate the indoor temperature where the fan coil unit is located. After the indoor temperature is regulated, the indoor humidity is detected, and the operating mode of the fan coil unit is determined based on the humidity. The fan coil unit is then controlled to operate according to this operating mode. This operating mode includes at least a heat preservation and humidity humidification mode and a humidity humidification mode to simultaneously address both temperature and humidity requirements, or minimize humidity fluctuations. Through this scheme of adjusting the number of operating groups of the surface cooler coils, graded regulation is achieved. This not only results in more reasonable regulation but also considers both temperature and humidity control. Furthermore, different operating modes are available to suit different application scenarios, improving the fan coil unit's adaptability and user comfort. This effectively solves the problems of fixed operating modes, narrow cooling capacity range, and inability to adjust humidity, as well as weak scenario adaptability, inherent in conventional fan coil units in the prior art.

[0040] In a preferred embodiment of the present invention, determining the initial number of activated coil groups for the surface cooler includes: acquiring the user's set temperature and the current indoor temperature; wherein the current indoor temperature is the dry-bulb temperature; calculating the temperature difference between the current indoor temperature and the set temperature, and determining the initial number of activated coil groups for the surface cooler based on the temperature difference. First, the user's set temperature is used as the adjustment target. The difference between the indoor temperature and the target temperature is detected and used in the next step to allocate the number of coil rows for the surface cooler, i.e., the initial number of activated coil groups, so that the indoor temperature reaches the user's set temperature. The dry-bulb temperature is used for calculation and corresponding control; that is, humidity is not processed during the temperature adjustment stage, only temperature is considered, and humidity is adjusted after the temperature requirement is met. This separate adjustment improves the adjustment accuracy.

[0041] Specifically, determining the initial number of operating groups of the surface cooler coils based on the temperature difference includes: obtaining the required cooling capacity corresponding to the temperature difference; determining the initial number of operating groups of the surface cooler coils based on the required cooling capacity; wherein, there are preset cooling capacity adjustment ranges corresponding to different numbers of operating groups of surface cooler coils, so that the required cooling capacity is within the cooling capacity adjustment range corresponding to the initial number of operating groups, wherein, the larger the temperature difference, the larger the required cooling capacity, and the larger the required cooling capacity, the more initial operating groups are required.

[0042] Figure 3 This is a schematic diagram illustrating one possible operating range of cooling capacity for different numbers of rows of fan coil units, such as... Figure 3As shown, the horizontal axis represents cooling capacity, and the vertical axis represents the number of rows of surface cooler coils. 0~a represents the cooling capacity operating range of one row of surface cooler coils, a~b represents the cooling capacity range excluding the overlapping cooling capacity of rows 1 and 2, and b~c is similar to c~d. Therefore, when humidity cannot meet user needs, in the overlapping cooling capacity range, operation with fewer rows can be prioritized to reduce humidity fluctuations and achieve intelligent humidity control of the unit. The data for a, b, c, and d can be obtained through experimental testing during the unit development phase.

[0043] During the temperature control phase, the surface cooler is controlled to operate in a reasonable number of rows by controlling the temperature difference within different ranges. This avoids unreasonable situations such as operating with 4 rows of surface cooler coils when the temperature difference is very small, resulting in very small air volume, or operating with 1 row of surface cooler coils when the temperature difference is very large, resulting in very large air volume.

[0044] For example: if the temperature difference ΔT≤X, then the difference between the indoor temperature and the user-set temperature is small, start the first row of surface cooler coils and maintain operation for m minutes;

[0045] If X < ΔT ≤ Y, start the second row of surface cooler coils and maintain operation for m minutes;

[0046] If Y < ΔT ≤ Z, start the 3rd row of surface cooler coils and maintain operation for m minutes;

[0047] If △T>Z, then the difference between the indoor temperature and the user-set temperature is large, and the 4th row of surface cooler coils will be started and kept running for m minutes;

[0048] X, Y, and Z are the optimal operating temperature difference values ​​for each row of coils, to avoid situations where there is a small air volume and a large number of coils, i.e., a small temperature difference and a large cooling capacity, or a large air volume and a small number of coils, i.e., a large temperature difference and a small cooling capacity.

[0049] To achieve accurate temperature control, this control scheme, after controlling the cooling coil to start according to the initial number of start groups, also includes: after the cooling coil has been started for a first preset time, detecting the current indoor temperature and determining whether the current indoor temperature has reached the set temperature; if so, confirming that the indoor temperature adjustment is complete; otherwise, if the current indoor temperature is higher than the set temperature, re-determining the initial number of start groups of the cooling coil; if the current indoor temperature is lower than the set temperature, controlling the fan coil to stop for a second preset time, and then re-determining the initial number of start groups of the cooling coil.

[0050] The system detects the indoor temperature after running for a period of time and calculates the difference between it and the user-set temperature to determine whether the current temperature has reached the target temperature. For example, if the current indoor temperature is T3, the absolute value of the difference between the current indoor temperature and the user-set temperature is calculated as ΔT = |T3 - T 设| Determine if △T≤T' is true, where T' is the allowable temperature difference, and use this to determine if the indoor temperature meets the user's set requirements. If yes, the temperature has reached the user's set temperature, and humidity control begins; if no, the temperature has not reached the user's set temperature. The indoor temperature not reaching the target temperature indicates either excessively high or low temperatures. If too high, return to determine the initial number of coils to be activated, as the cooling temperature difference may change over time, requiring readjustment of the coil count. If too low, stop the machine for a period until the temperature rises, then return to determine the initial number of coils to be activated again, ensuring the indoor temperature reaches the set temperature as quickly as possible, and making the adjustment process more closely match the current environment, resulting in faster adjustment and better performance.

[0051] In the above implementation, the temperature parameter has been initially adjusted, followed by humidity adjustment. Specifically, the operating mode of the fan coil unit is determined based on the indoor humidity, including: acquiring the user's set humidity and the current indoor humidity; when the set humidity is greater than the current indoor humidity, the operating mode is determined to be a heat preservation and humidification mode; when the set humidity is not greater than the current indoor humidity, the operating mode is determined to be a humidification mode. At this point, the temperature has reached the set temperature. The indoor air humidity is then acquired, and the indoor humidity can be calculated by acquiring the indoor dry-bulb temperature and wet-bulb temperature. The air enthalpy value can also be calculated using the humidity and the indoor dry-bulb temperature for use in the next stage, achieving either humidification or heat preservation and humidification effects.

[0052] When the operating mode is heat preservation and humidity control mode, the enthalpy difference of the air in the room where the fan coil unit is located is obtained, and the number of open groups of the surface cooler coil is adjusted according to the air enthalpy difference to regulate the indoor temperature and humidity. When the operating mode is humidity control mode, the required cooling capacity of the fan coil unit is obtained, the minimum number of open groups of the surface cooler coil to meet the required cooling capacity is determined, and the opening of the surface cooler coil is controlled according to the minimum number of open groups.

[0053] The system detects the current humidity level and compares it to the set humidity level. Since the air conditioner cannot humidify, it can only minimize humidity fluctuations. Given that the temperature already meets the target temperature, it determines whether the set humidity level is higher than the current humidity level, i.e., ψ. 设 >ψ1, if so, record the current stable cooling capacity value W of the unit at its operating temperature, enter the humidification mode, and follow the instructions in the appendix. Figure 3 Select the minimum number of coil rows in the surface cooler that meets the cooling capacity W. Minimize the number of coil rows while still meeting the cooling capacity requirements. This minimizes humidity changes and does not alter the temperature. If the humidity is set to be no greater than the current humidity, i.e., ψ... 设 With an enthalpy value of ≤ψ1, temperature and humidity can be simultaneously satisfied through enthalpy adjustment. The appropriate number of coil rows for the surface cooler can be selected based on the enthalpy value to avoid unreasonable operating conditions.

[0054] Specifically, adjusting the number of operating groups of the surface cooler coils based on the air enthalpy difference includes: obtaining the enthalpy operating range corresponding to different numbers of surface cooler coil groups; wherein the enthalpy operating ranges corresponding to two adjacent groups of surface cooler coils overlap; determining whether the air enthalpy difference is within the overlapping range; if so, controlling the surface cooler coils to operate according to the energy-saving mode; otherwise, controlling the surface cooler coils to operate according to the number of groups of surface cooler coils corresponding to the air enthalpy difference. Further, controlling the surface cooler coils to operate according to the energy-saving mode includes: comparing the energy efficiency values ​​of the two groups of surface cooler coils corresponding to the overlapping range; controlling the surface cooler coils to operate according to the number of groups of surface cooler coils with the lower energy efficiency value.

[0055] Figure 4 A schematic diagram showing the enthalpy operating range for different numbers of coils in the surface cooler, as shown below. Figure 4 As shown, the horizontal axis represents enthalpy, and each box contains the operating range of enthalpy values ​​for each row of coils. Specifically, the operating range for row 1 surface cooler coils is 0~K2, for row 2 it's K1~K4, for row 3 it's K3~K6, and for row 4 it's K5~K7. K1~K2 represents the overlapping operating range of rows 1 and 2, K3~K4 represents the overlapping operating range of rows 2 and 3, and K5~K6 represents the overlapping operating range of rows 3 and 4. Therefore, within the overlapping operating ranges, by comparing the operating energy efficiency values ​​with one less row and one more row of surface cooler coils, the unit can achieve low-energy-efficiency operation, realizing energy-saving mode operation. Within the non-overlapping operating ranges, the unit operates normally according to its operating range, realizing conventional mode operation. Data such as K1 to K6 were obtained through experimental testing during the unit development phase.

[0056] For example, calculate the air enthalpy h1 under the current indoor temperature and humidity, calculate the air enthalpy h2 under the user-set temperature and humidity, and calculate the difference between the final required enthalpy and the current enthalpy: Δh = h2 - h1; according to the appendix Figure 4 Determine which part of the air enthalpy difference Δh ∈ (k1,k2), (k3,k4), or (k5,k6), i.e. whether it belongs to the overlapping part.

[0057] If the conditions do not overlap, run in normal cooling mode for m minutes as follows:

[0058] When △h≤k1, operate as one row of surface cooler coils;

[0059] When △h∈(k2,k3), it operates according to 2 rows of surface cooler coils;

[0060] When △h∈(k4,k5), it operates according to 3 rows of surface cooler coils;

[0061] When △h≥k6, operate according to 4 rows of surface cooler coils.

[0062] If the areas overlap, the energy-saving mode will be activated, operating as follows:

[0063] When △h∈(k1,k2), obtain the operating energy efficiency n1 of the first row of surface cooler coils and the operating energy efficiency n2 of the second row of surface cooler coils;

[0064] When △h∈(k3,k4), obtain the operating energy efficiency n1 of the 2-row surface cooler coil and the operating energy efficiency n2 of the 3-row surface cooler coil;

[0065] When △h∈(k5,k6), obtain the operating energy efficiency n1 of the 3-row surface cooler coil and the operating energy efficiency n2 of the 4-row surface cooler coil;

[0066] Determine whether the energy efficiency n1 of the coil with fewer tube rows is greater than or equal to the energy efficiency n2 of the coil with more tube rows, i.e., n1≥n2;

[0067] If so, run for m1 minutes with a large air volume and few pipe rows, then return to determine the initial number of open groups of the surface cooler coil;

[0068] If not, then run one more row of surface cooler coils at low air volume for m1 minutes and then return to determine the initial number of open groups of surface cooler coils.

[0069] This means operating in a mode with higher energy efficiency to achieve energy-saving effects.

[0070] Within the overlapping range of enthalpy values ​​for different numbers of tube rows, such as enthalpy h1 which can be satisfied by one row of surface cooler coils and two rows of surface cooler coils, there are differences in operating energy efficiency for different numbers of tube rows. By comparing energy efficiency, the operating mode with higher energy efficiency is selected to achieve energy saving.

[0071] In the above implementation, the operation of the 1-4 rows of cooling coils is adjusted in stages by calculating the difference between the indoor temperature and the user-set temperature. After adjustment, the difference between the indoor temperature and the user-set temperature is calculated again to determine whether the indoor temperature meets the user's set temperature. If not, the unit is shut down or the above actions are repeated until the requirement is met. If the requirement is met, the unit operates in normal cooling mode, energy-saving mode, or humidity-regulating mode based on the indoor humidity and the user-set humidity. When the user-set humidity is higher than the current indoor humidity, the unit operates in energy-saving mode or normal cooling mode, adjusting the enthalpy value to simultaneously meet both temperature and humidity requirements. Conversely, the unit operates in humidity-regulating mode, selecting fewer cooling coil rows based on the unit's current cooling capacity to maintain indoor humidity as much as possible while meeting the temperature requirement. Therefore, the unit autonomously adjusts to these three modes, achieving energy saving, comfort, and significantly improved adaptability to different scenarios.

[0072] In a preferred embodiment 1 of the present invention, another fan coil unit control method is also provided, specifically... Figure 5An optional flowchart of the method is shown, such as Figure 5 As shown, the method includes the following steps S501-S520:

[0073] S501: Obtain the set temperature T 设 Humidity ψ 设 ;

[0074] S502: Detects indoor dry bulb temperature T1;

[0075] S503: Calculate △T = T1 - T 设 By controlling the surface cooler to operate at a reasonable number of rows within different temperature ranges, unreasonable situations such as operating with 4 rows of tubes when the temperature difference is very small, resulting in very small air volume, or operating with 1 row of tubes when the temperature difference is very large, resulting in very large air volume, are avoided.

[0076] S504: △T≤x, start the first row of surface coolers (coils) and maintain operation for m minutes;

[0077] S505: x<△T≤y, start the second row of surface coolers and maintain operation for m minutes;

[0078] S506: y<△T≤z, start the 3rd row of surface coolers and maintain operation for m minutes;

[0079] S507:z<△T, start the 4th row of surface coolers and maintain operation for m minutes;

[0080] S508: Detect indoor temperature T3, ΔT = |T3 - T 设 If |≤T' is true, proceed to step S511; otherwise, proceed to step S509. Detect the indoor temperature after running for a period of time and calculate the difference to determine if the temperature has reached the target temperature. If the indoor temperature has not reached the target temperature, there is a situation where the temperature is too high or too low. If it is too high, return to S502, because the cooling temperature difference will decrease over time, and there is a possibility of readjusting the number of rows of the two heat exchangers. If it is too low, stop the machine for a period of time, and return to S502 again after the temperature rises.

[0081] S509:T 设 > Check if T3 is true. If yes, proceed to step S502; otherwise, proceed to step S510.

[0082] S510: Stop operation for m minutes;

[0083] S511: Detection of indoor dry-bulb and wet-bulb temperatures T 4、 T5, calculate humidity ψ1, enthalpy h1, based on T4, ψ 设,We obtain h2, Δh = h2 - h1; At this point, the temperature has reached the set temperature. We calculate the humidity and enthalpy of the indoor air at this time, as well as the air enthalpy of the target temperature and humidity, and calculate the enthalpy difference between the two. This will be used to rationally adjust the number of coil rows of the surface cooler based on the enthalpy difference in the future.

[0084] S512:ψ 设 >Whether ψ is true or false, if yes, proceed to step S513; otherwise, proceed to step S519.

[0085] S513: Determine whether △h∈(k1,k2) or (k3,k4) or (k5,k6) is true. If yes, proceed to step S514; otherwise, proceed to step S518.

[0086] S514: Energy efficiency under two operating states when Δh is obtained from the table:

[0087] When △h∈(k1,k2), we obtain the operating efficiency n1 of the first row of pipes and the operating efficiency n2 of the second row of pipes.

[0088] When △h∈(k3,k4), we obtain the energy efficiency n1 for 2 rows of pipes and the energy efficiency n2 for 3 rows of pipes.

[0089] When △h∈(k5,k6), we obtain the energy efficiency n1 for 3 rows of pipes and the energy efficiency n2 for 4 rows of pipes.

[0090] S515: Is n1≥n2 true? If yes, proceed to step S516; otherwise, proceed to step S517. Within the overlapping range of enthalpy values ​​for different numbers of tube rows, such as enthalpy h1 being satisfied by both one and two tube rows, there are differences in energy efficiency for different numbers of tube rows. By comparing energy efficiency, the operating mode with higher energy efficiency is selected to achieve energy saving.

[0091] S516: Operate according to the principle of large air volume and few pipes;

[0092] S517: Operate with one more row of pipes for small air volume;

[0093] S518: Run for m minutes in the following state:

[0094] When △h≤k1, operate according to 1 row of pipes;

[0095] When △h∈(k2,k3), it operates according to 2 rows of pipes;

[0096] When △h∈(k4,k5), it operates according to 3 rows of pipes;

[0097] When △≥k6, operate with 4 rows of coils; when the target humidity is greater than the current humidity, temperature and humidity can be simultaneously satisfied by adjusting the enthalpy value. Select an appropriate number of coil rows for the surface cooler based on the enthalpy difference to avoid unreasonable operating conditions.

[0098] S519: Records the current cooling capacity of the unit;

[0099] S520: Select the minimum number of coil rows required to meet the cooling capacity W and run for m minutes. Detect the current humidity and the set humidity. Since the air conditioner cannot humidify, it can only minimize humidity changes. Once it is determined that the current temperature meets the target temperature, record the current cooling capacity. To minimize humidity changes and maintain the temperature, the number of coil rows on the surface cooler should be minimized while still meeting the cooling capacity requirements.

[0100] In the above implementation, a multi-mode fan coil control method is adopted. Humidity is adjusted by enthalpy value, taking into account both temperature and humidity. Based on the enthalpy operating range of each coil row, energy efficiency values ​​are further compared to optimize the selection of the number of coil rows in the cooling coil, thus achieving energy-saving effects. When humidity requirements are insufficient, fewer coil rows are selected based on the cooling capacity operating range of each coil row to avoid excessive dehumidification caused by low airflow and high cooling capacity. Therefore, the mode is autonomously adjusted, balancing temperature, humidity, and energy-saving effects, effectively improving the unit's adaptability to various scenarios and enhancing human comfort. Example 2

[0101] Based on the fan coil unit control method provided in Embodiment 1 above, a fan coil unit control device is also provided in a preferred embodiment 2 of the present invention. The fan coil unit includes a surface cooler assembly and an adjustable manifold. The surface cooler assembly includes multiple sets of surface cooler coils. The adjustable manifold is connected to the multiple sets of surface cooler coils and is used to control the number of surface cooler coils that are turned on.

[0102] Specifically, Figure 6 An alternative structural block diagram of the device is shown, such as... Figure 6 As shown, the device includes:

[0103] The determination module 602 is used to determine the initial number of open groups of the surface cooler coils and control the opening of the surface cooler coils according to the initial number of open groups to adjust the indoor temperature where the fan coil unit is located.

[0104] The detection module 604, connected to the determination module 602, is used to detect the indoor humidity where the fan coil unit is located after the indoor temperature has been adjusted.

[0105] The control module 606, connected to the detection module 604, is used to determine the operating mode of the fan coil unit based on the indoor humidity and control the operation of the fan coil unit according to the operating mode; wherein the operating modes include at least: heat preservation and humidity mode and humidity mode.

[0106] In the above embodiments, a fan coil unit control scheme is provided, applied to fan coil units with adjustable surface cooler assemblies. First, the initial number of operating groups of the surface cooler coils is determined, and the coils are controlled to operate according to this initial number to regulate the indoor temperature where the fan coil unit is located. After the indoor temperature is regulated, the indoor humidity is detected, and the operating mode of the fan coil unit is determined based on the humidity. The fan coil unit is then controlled to operate according to this operating mode. This operating mode includes at least a heat preservation and humidity humidification mode and a humidity humidification mode to simultaneously address both temperature and humidity requirements, or minimize humidity fluctuations. Through this scheme of adjusting the number of operating groups of the surface cooler coils, graded regulation is achieved. This not only results in more reasonable regulation but also considers both temperature and humidity control. Furthermore, different operating modes are available to suit different application scenarios, improving the fan coil unit's adaptability and user comfort. This effectively solves the problems of fixed operating modes, narrow cooling capacity range, and inability to adjust humidity, as well as weak scenario adaptability, inherent in conventional fan coil units in the prior art.

[0107] The determining module 602 includes: a first acquisition submodule, used to acquire the user's set temperature and the current indoor temperature; wherein the current indoor temperature is the dry bulb temperature; and a calculation submodule, used to calculate the temperature difference between the current indoor temperature and the set temperature, and determine the initial number of open groups of the surface cooler coils based on the temperature difference.

[0108] The calculation submodule includes: an acquisition unit, used to acquire the cooling capacity adjustment range corresponding to different numbers of surface cooler coils; and a determination unit, used to determine the initial number of open groups of surface cooler coils based on the correspondence table between temperature difference and cooling capacity adjustment range; wherein, the larger the temperature difference, the more initial groups are opened.

[0109] Furthermore, the determining module 602 also includes: a detection submodule, used to detect the current indoor temperature after the cooling coil is turned on according to the initial number of turns on, and to determine whether the current indoor temperature has reached the set temperature after the cooling coil has been turned on for a first preset time; and a first determining submodule, used to determine that the indoor temperature adjustment is complete if the temperature has reached the set temperature; otherwise, if the current indoor temperature is greater than the set temperature, to re-determine the initial number of turns on the cooling coil, and if the current indoor temperature is less than the set temperature, to control the fan coil unit to stop for a second preset time and then re-determine the initial number of turns on the cooling coil.

[0110] The control module 606 includes: a second acquisition submodule for acquiring the user's set humidity and the current indoor humidity; a second determination submodule for determining the operating mode as heat preservation and humidification mode when the set humidity is greater than the current indoor humidity; and a third determination submodule for determining the operating mode as humidification mode when the set humidity is not greater than the current indoor humidity.

[0111] The control module 606 further includes a control submodule for controlling the operation of the fan coil unit according to the operating mode. The control submodule includes: a first control unit for obtaining the air enthalpy difference between the current air enthalpy value and the target air enthalpy value in the room where the fan coil unit is located when the operating mode is heat preservation and humidity mode, and adjusting the number of open groups of the surface cooler coil according to the air enthalpy difference to regulate the indoor temperature and humidity; and a second control unit for obtaining the required cooling capacity of the fan coil unit when the operating mode is humidity mode, determining the minimum number of open groups of the surface cooler coil to meet the required cooling capacity, and controlling the surface cooler coil to open according to the minimum number of open groups.

[0112] The first control unit includes: an acquisition subunit for acquiring the enthalpy operating range corresponding to different numbers of surface cooler coils; wherein the enthalpy operating ranges corresponding to two adjacent groups of surface cooler coils overlap; a judgment subunit for judging whether the air enthalpy difference is within the overlapping range; and a control subunit for controlling the surface cooler coils to turn on according to the energy-saving mode if the air enthalpy difference is within the overlapping range; otherwise, controlling the surface cooler coils to turn on according to the number of groups of surface cooler coils corresponding to the air enthalpy difference.

[0113] The control subunit includes: comparing the energy efficiency values ​​of the two sets of surface cooler coils corresponding to the overlapping range; and controlling the opening of the surface cooler coils according to the number of sets of surface cooler coils with the lower energy efficiency value.

[0114] In the above implementation, the operation of the cooling coils is adjusted in stages by calculating the difference between the indoor temperature and the user-set temperature. After adjustment, the difference between the indoor temperature and the user-set temperature is calculated again to determine whether the indoor temperature meets the user's set temperature. If not, the unit is shut down or the above actions are repeated until the requirement is met. If the requirement is met, the unit operates in normal cooling mode, energy-saving mode, or humidity-regulating mode based on the indoor humidity and the user-set humidity. When the user-set humidity is higher than the current indoor humidity, the unit operates in energy-saving mode or normal cooling mode, adjusting the enthalpy value to simultaneously meet both temperature and humidity requirements. Conversely, the unit operates in humidity-regulating mode, selecting fewer coils based on the unit's current cooling capacity to maintain indoor humidity as much as possible while meeting the temperature requirement. Thus, the unit autonomously adjusts to three modes, achieving energy saving, comfort, and significantly improved adaptability to different scenarios.

[0115] Regarding the apparatus in the above embodiments, the specific manner in which each unit and module performs its operations has been described in detail in the embodiments related to the method, and will not be elaborated upon here. Example 3

[0116] Based on the fan coil control device provided in Embodiment 2 above, a fan coil unit is further provided in a preferred embodiment 3 of the present invention, including the fan coil control device as described above.

[0117] In the above embodiments, a fan coil unit control scheme is provided, applied to fan coil units with adjustable surface cooler assemblies. First, the initial number of operating groups of the surface cooler coils is determined, and the coils are controlled to operate according to this initial number to regulate the indoor temperature where the fan coil unit is located. After the indoor temperature is regulated, the indoor humidity is detected, and the operating mode of the fan coil unit is determined based on the humidity. The fan coil unit is then controlled to operate according to this operating mode. This operating mode includes at least a heat preservation and humidity humidification mode and a humidity humidification mode to simultaneously address both temperature and humidity requirements, or minimize humidity fluctuations. Through this scheme of adjusting the number of operating groups of the surface cooler coils, graded regulation is achieved. This not only results in more reasonable regulation but also considers both temperature and humidity control. Furthermore, different operating modes are available to suit different application scenarios, improving the fan coil unit's adaptability and user comfort. This effectively solves the problems of fixed operating modes, narrow cooling capacity range, and inability to adjust humidity, as well as weak scenario adaptability, inherent in conventional fan coil units in the prior art. Example 4

[0118] Based on the fan coil control method provided in Embodiment 1 above, in a preferred embodiment 4 of the present invention, a storage medium containing computer-executable instructions is also provided. When executed by a computer processor, the computer-executable instructions are used to execute the fan coil control method as described above.

[0119] In the above embodiments, a fan coil unit control scheme is provided, applied to fan coil units with adjustable surface cooler assemblies. First, the initial number of operating groups of the surface cooler coils is determined, and the coils are controlled to operate according to this initial number to regulate the indoor temperature where the fan coil unit is located. After the indoor temperature is regulated, the indoor humidity is detected, and the operating mode of the fan coil unit is determined based on the humidity. The fan coil unit is then controlled to operate according to this operating mode. This operating mode includes at least a heat preservation and humidity humidification mode and a humidity humidification mode to simultaneously address both temperature and humidity requirements, or minimize humidity fluctuations. Through this scheme of adjusting the number of operating groups of the surface cooler coils, graded regulation is achieved. This not only results in more reasonable regulation but also considers both temperature and humidity control. Furthermore, different operating modes are available to suit different application scenarios, improving the fan coil unit's adaptability and user comfort. This effectively solves the problems of fixed operating modes, narrow cooling capacity range, and inability to adjust humidity, as well as weak scenario adaptability, inherent in conventional fan coil units in the prior art.

[0120] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0121] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0122] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0123] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0124] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0125] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0126] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0127] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A fan coil unit control method, characterized in that, The method is applied to fan coil units, wherein the fan coil unit includes: a surface cooler assembly and an adjustable manifold, the surface cooler assembly includes multiple sets of surface cooler coils, and the adjustable manifold is connected to the multiple sets of surface cooler coils for controlling the number of surface cooler coils in operation; the method includes: Determine the initial number of operating groups of the surface cooler coils, and control the surface cooler coils to operate according to the initial number of operating groups in order to adjust the indoor temperature where the fan coil unit is located. After the indoor temperature is adjusted, the indoor humidity where the fan coil unit is located is detected; The operating mode of the fan coil unit is determined based on the indoor humidity, and the operation of the fan coil unit is controlled according to the operating mode; wherein, the operating mode includes at least: heat preservation and humidity mode and humidity mode.

2. The method according to claim 1, characterized in that, Determine the initial number of open groups for the surface cooler coils, including: Obtain the user's set temperature and the current indoor temperature; wherein, the current indoor temperature is the dry-bulb temperature; Calculate the temperature difference between the current indoor temperature and the set temperature, and determine the initial number of open groups of the surface cooler coil based on the temperature difference.

3. The method according to claim 2, characterized in that, Determining the initial number of open groups of the surface cooler coil based on the temperature difference includes: Obtain the required cooling capacity corresponding to the temperature difference; The initial number of operating groups of the surface cooler coils is determined based on the required cooling capacity. The cooling capacity adjustment ranges corresponding to different numbers of the surface cooler coils are preset.

4. The method according to claim 2, characterized in that, After controlling the surface cooler coils to start according to the initial number of start groups, the process further includes: After the surface cooler coil is turned on for a first preset time, the current indoor temperature is detected to determine whether the current indoor temperature has reached the set temperature. If so, confirm that the indoor temperature adjustment is complete; Otherwise, if the current indoor temperature is greater than the set temperature, the initial number of the cooling coil units to be turned on is re-determined; if the current indoor temperature is less than the set temperature, the fan coil unit is controlled to stop for a second preset time, and then the initial number of the cooling coil units to be turned on is re-determined.

5. The method according to claim 1, characterized in that, Determining the operating mode of the fan coil unit based on the indoor humidity includes: Obtain the user's set humidity level and the current indoor humidity; When the set humidity is greater than the current indoor humidity, the operating mode is determined to be the heat preservation and moisture retention mode; When the set humidity is not greater than the current indoor humidity, the operating mode is determined to be the humidification mode.

6. The method according to claim 5, characterized in that, Controlling the operation of the fan coil unit according to the aforementioned operating mode includes: When the operating mode is the heat preservation and humidity mode, the difference between the current air enthalpy value and the target air enthalpy value in the room where the fan coil unit is located is obtained, and the number of opening groups of the surface cooler coil is adjusted according to the air enthalpy difference to adjust the indoor temperature and the indoor humidity. When the operating mode is the humidification mode, the required cooling capacity of the fan coil unit is obtained, the minimum number of operating groups of the surface cooler coil unit that meets the required cooling capacity is determined, and the surface cooler coil unit is controlled to open according to the minimum number of operating groups.

7. The method according to claim 6, characterized in that, Adjusting the number of open groups of the surface cooler coils according to the air enthalpy difference includes: Obtain the enthalpy operating range corresponding to different numbers of the surface cooler coils; wherein, the enthalpy operating ranges corresponding to two adjacent groups of the surface cooler coils overlap. Determine whether the difference in air enthalpy values ​​is within the overlapping range; If so, control the surface cooler coil to turn on according to the energy-saving mode; Otherwise, the cooling coils are controlled to open according to the number of cooling coil groups corresponding to the air enthalpy difference.

8. The method according to claim 7, characterized in that, Controlling the operation of the surface cooler coil according to the energy-saving mode includes: Compare the energy efficiency values ​​of the two sets of surface cooler coils corresponding to the overlapping range; The operation of the surface cooler coil is controlled according to the number of groups of surface cooler coils with the lower energy efficiency value.

9. A fan coil unit control device, characterized in that, An application to fan coil units, the fan coil unit comprising: a surface cooler assembly and an adjustable manifold, the surface cooler assembly comprising multiple sets of surface cooler coils, the adjustable manifold being connected to the multiple sets of surface cooler coils for controlling the number of surface cooler coils in operation; the device comprising: The determination module is used to determine the initial number of activation groups of the surface cooler coils, and control the surface cooler coils to activate according to the initial number of activation groups in order to adjust the indoor temperature where the fan coil unit is located. The detection module is used to detect the indoor humidity where the fan coil unit is located after the indoor temperature has been adjusted. The control module is used to determine the operating mode of the fan coil unit based on the indoor humidity, and control the operation of the fan coil unit according to the operating mode; wherein the operating mode includes at least: heat preservation and humidity mode and humidity mode.

10. A fan coil unit, characterized in that, Includes the fan coil unit control device as described in claim 9.

11. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the fan coil control method as described in any one of claims 1 to 8.

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