Method for controlling water flow of water-cooled fresh air dehumidification unit

Abstract

The invention discloses a control method for the water flow of a water-cooled fresh air dehumidification unit. The control method comprises the following steps that (1) equipment is initialized; 2) dynamic control logic; and 3) controlling the period. By monitoring the temperature difference of inlet and outlet water in real time and combining the air outlet moisture content and the target moisture content or the air outlet temperature and the target temperature, the voltage of the water flow actuator is dynamically adjusted, precise control is achieved, and it is ensured that the water-cooling dehumidifier can efficiently and stably operate under various conditions.

Description

Technical Field

[0001] The present invention relates to a control method for the water flow rate of a water-cooled fresh air dehumidification unit. Background Art

[0002] With the aggravation of global warming and humid environment problems, the demand for water-cooled fresh air dehumidifiers has increased significantly. Traditional dehumidifiers mostly adopt fixed water flow rate or single-parameter regulation methods, which are difficult to adapt to complex working conditions, resulting in low energy efficiency or unstable operation. For example, when the cooling water flow rate is 5-6 m 3 / h and the inlet water temperature is 26 °C, the system performance is optimal, but the existing technology lacks a dynamic regulation mechanism and cannot automatically optimize the water flow rate under different temperature differences and moisture contents. Therefore, there is an urgent need for a control method that can dynamically regulate the water flow rate by combining multiple parameters to improve the dehumidification energy efficiency and the equipment life. Summary of the Invention

[0003] In view of the above problems, the present invention provides a control method for the water flow rate of a water-cooled fresh air dehumidification unit. By real-time monitoring of the temperature difference between the inlet and outlet water, combined with the moisture content of the outlet air and the target moisture content or the outlet air temperature and the target temperature, the voltage of the water flow actuator is dynamically adjusted to achieve precise control, effectively solving the problems pointed out in the background art.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A control method for the water flow rate of a water-cooled fresh air dehumidification unit, comprising the following steps:

[0006] 1), Equipment initialization:

[0007] The initial voltage of the water flow actuator is V ini , and it automatically resets to the standby state after power-on or restart;

[0008] 2), Dynamic control logic:

[0009] Condition 1: When the temperature difference T cs -T js ≥a, based on the moisture content deviation, the voltage increment is calculated using the PID algorithm: V n+1 =V n +[K p *Err1] / x+(K i *Sum1) / y+(K d *SumDelta1) / z, where the moisture content deviation Err1 = D c +I-D t ;

[0010]

[0011] Condition 2: When the temperature difference T cs -T js ≤b, based on the temperature deviation, the voltage increment is calculated using the PID algorithm: V n+1 =V n +[K p *Err2] / u+(K i *Sum2) / v+(K d *SumDelta2) / w, where the temperature deviation Err2 = T c +J-T t ;

[0012]

[0013] Condition 3: When the temperature difference T cs -T js <a or T cs -T js >b, the water flow actuator maintains the initial voltage V ini and runs;

[0014] 3), Control period:

[0015] Update the voltage value of the water flow actuator according to the period T, and the water flow actuator adjusts the opening degree according to the voltage value;

[0016] Among them, V n is the current voltage of the water flow actuator, V n+1 is the voltage of the water flow actuator in the next cycle, V ini is the initial voltage of the water flow actuator, T cs is the outlet water temperature, T js is the inlet water temperature, a, b, x, y, z, u, v, w, K p 、K i 、K d are system parameters respectively.

[0017] Preferably, the voltage range of the water flow actuator is 0 - 12v, the opening degree range of the water flow actuator is 0 - 90°, and the voltage range of the water flow actuator corresponds to the opening degree range.

[0018] Preferably, the period T is 30 seconds.

[0019] Preferably, the a, b, x, y, z, u, v, w, K p 、K i 、K d are determined during system debugging, and different systems have different values.

[0020] By monitoring the temperature difference between the inlet and outlet water in real time, and combining the moisture content of the outlet air and the target moisture content or the outlet air temperature and the target temperature, the voltage of the water flow actuator is dynamically adjusted to achieve precise control, ensuring that the water-cooled dehumidifier can operate efficiently and stably under various conditions.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. Improve dehumidification energy efficiency and reduce operating energy consumption:

[0023] Dynamically optimize the water flow: Traditional methods use a fixed water flow or single-parameter adjustment, which is difficult to adapt to different working conditions (such as fluctuations in ambient temperature and humidity, changes in inlet water temperature). The present invention dynamically adjusts the water flow by monitoring the temperature difference between the inlet and outlet water (T cs -T js ) in real time, and combining the deviation between the moisture content of the outlet air (D c ) or the outlet air temperature (T c ) and the target value, ensuring that the system always operates in the efficient range. For example, when the inlet water temperature is 26°C, by adjusting the water flow to the optimized range of 5-6m 3 / h, the dehumidification energy efficiency can be increased by 15%-20%;

[0024] Precise control of the PID algorithm: Through the combined action of the proportional (K p ), integral (K i ), and derivative (K d ) terms, the steady-state error is quickly eliminated, overshoot or oscillation is avoided, and ineffective energy consumption is reduced. Experiments show that compared with traditional on-off control or proportional control, the energy consumption can be reduced by 10%-15%;

[0025] 2. Enhance the operating stability and adaptability:

[0026] Multi-condition adaptability: Switch the control mode according to the temperature difference threshold (a, b): When the temperature difference is large (T cs -T js ≥a), the moisture content deviation (Err1) is preferentially adjusted to ensure rapid dehumidification in a high-humidity environment; when the temperature difference is small (T cs -T js ≤b), the temperature deviation (Err2) is adjusted to maintain the stability of the outlet air temperature and avoid overcooling or frosting;

[0027] Anti-interference ability: The 30-second adjustment cycle can not only respond to changes in working conditions in a timely manner but also avoid mechanical wear caused by frequent actions, especially suitable for scenarios with large day-night temperature differences or seasonal humidity fluctuations;

[0028] 3. Prolong the service life of the equipment:

[0029] Reduce mechanical losses: By replacing traditional on - off control with smooth PID regulation, avoid frequent start - stop of the water flow actuator, reduce wear of key components such as valves and pumps, and extend the equipment life by about 20% - 30%.

[0030] Prevent damage under extreme working conditions: When the temperature difference exceeds the threshold range (Tcs - Tjs b), maintain the initial voltage operation to avoid equipment overload or damage caused by abnormal working conditions (such as sudden change in cooling water temperature).

[0031] 4. Improve user experience and maintenance convenience:

[0032] Intelligent operation: It can adapt to complex environments without manual intervention. Users only need to set the target moisture content (D t ) or target temperature (T t ), and the system automatically completes the optimization adjustment.

[0033] Debugging flexibility: PID parameters (K p , K i , K d ) and thresholds (a, b) can be independently set according to different models of equipment or installation environments, facilitating on - site debugging and later maintenance.

[0034] 5. Technical compatibility and expandability:

[0035] Modular design: The water flow actuator and the control system can be integrated into the existing dehumidifier architecture without large - scale equipment modification, reducing the upgrade cost.

[0036] Expand application scenarios: This method is not only applicable to fresh - air dehumidifiers, but also can be extended to other water - cooled temperature - control equipment (such as chillers, air - conditioning systems), with broad application prospects.

[0037] Through the combination of multi - parameter coordinated control and the PID algorithm, the present invention solves problems such as low energy efficiency, poor stability, and short life of traditional water - cooled dehumidifiers, achieving significant improvements in multiple dimensions such as technology, economy, and environment, and providing an efficient and reliable solution for indoor air conditioning in high - humidity environments. Specific implementation manners

[0038] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0039] 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 forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0041] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0043] The present invention will be further described in detail below through specific embodiments.

[0044] Embodiment 1

[0045] A control method for the water flow rate of a water-cooled fresh air dehumidification unit, comprising the following steps:

[0046] 1), Equipment initialization:

[0047] The initial voltage of the water flow actuator is V ini, it automatically resets to the standby state after power-on or restart. The voltage range of the water flow actuator is 0 - 12V, and the opening range of the water flow actuator is 0 - 90°. The voltage range of the water flow actuator corresponds to the opening range;

[0048] 2), Dynamic control logic:

[0049] Condition 1: When the temperature difference T cs - T js ≥ a, based on the moisture content deviation, use the PID algorithm to calculate the voltage increment: V n+1 = V n + [K p * Err1] / x + (K i * Sum1] / y + (K d * SumDelta1] / z, where the moisture content deviation Err1 = D c + I - D t ;

[0050]

[0051] Condition 2: When the temperature difference T cs - T js ≤ b, based on the temperature deviation, use the PID algorithm to calculate the voltage increment: V n+1 = V n + [K p * Err2] / u + (K i * Sum2] / v + (K d * SumDelta2] / w, where the temperature deviation Err2 = T c + J - T t ;

[0052]

[0053] Condition 3: When the temperature difference T cs - T js < a or T cs - T js > b, the water flow actuator maintains the initial voltage V ini and runs;

[0054] 3), Control period:

[0055] Update the voltage value of the water flow actuator according to the period of 30 seconds, and the water flow actuator adjusts the opening according to the voltage value;

[0056] Among them, V n is the current voltage of the water flow actuator, V n+1 is the voltage of the water flow actuator in the next cycle, Vini is the initial voltage of the water flow actuator, T cs is the outlet water temperature, T js is the inlet water temperature, a, b, x, y, z, u, v, w, K p , K i , K d They are system parameters, which are determined during system debugging and have different values ​​for different systems.

[0057] The present invention realizes precise control by monitoring the inlet and outlet water temperature difference in real time, combining the outlet air moisture content and the target moisture content or the outlet air temperature and the target temperature, dynamically adjusting the voltage of the water flow actuator, and ensuring that the water-cooled dehumidifier can operate efficiently and stably under various conditions.

[0058] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A control method for the water flow rate of a water-cooled fresh air dehumidification unit, characterized in that, It includes the following steps: 1) Equipment initialization: The initial voltage of the water flow actuator is V ini , and it automatically resets to the standby state after power-on or restart; 2) Dynamic control logic: Condition 1: When the temperature difference T cs -T js ≥a, based on the moisture content deviation, the voltage increment is calculated using the PID algorithm: V n+1 =V n +[K p *Err1] / x+(K i *Sum1) / y+(K d *SumDelta1) / z, where the moisture content deviation Err1 = D c +I - D t ; Condition 2: When the temperature difference T cs -T js ≤b, based on the temperature deviation, calculate the voltage increment using the PID algorithm: V n+1 =V n +[K p *Err2] / u+(K i *Sum2) / v+(K d *SumDelta2) / w, where the temperature deviation Err2 = T c +J-T t ; Condition 3: When the temperature difference T cs -T js <a or T cs -T js >b, the water flow actuator maintains the initial voltage V ini and runs; 3) Control cycle: Update the voltage value of the water flow actuator according to the cycle T, and the water flow actuator adjusts the opening degree according to the voltage value; Among them, V n is the current voltage of the water flow actuator, V n+1 is the voltage of the water flow actuator in the next cycle, V ini is the initial voltage of the water flow actuator, T cs is the outlet water temperature, T js is the inlet water temperature, a, b, x, y, z, u, v, w, K p and K i and K d are system parameters respectively.

2. The control method for the water flow rate of a water-cooled fresh air dehumidification unit according to claim 1, wherein The voltage range of the water flow actuator is 0 - 12V, the opening degree range of the water flow actuator is 0 - 90°, and the voltage range of the water flow actuator corresponds to the opening degree range.

3. The control method for the water flow rate of a water-cooled fresh air dehumidification unit according to claim 1, wherein The cycle T is 30 seconds.

4. The control method for the water flow rate of a water-cooled fresh air dehumidification unit according to claim 1, characterized in that, The described a, b, x, y, z, u, v, w, K p , K i , K d Are determined during system debugging, and different systems have different values.

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