Graphene wallboard integrated control method based on hot area distribution

Abstract

The invention specifically relates to a graphene wallboard integrated control method based on hot area distribution, and relates to the technical field of heating and ventilation control, and the method comprises the steps: dividing a flow state interval based on a preset critical Rayleigh number and a safety Rayleigh number, and outputting a corresponding control strategy of full-open, half-power full-open or convection suppression. According to the method, the opening state of the wallboards is matched in real time through dynamic characteristic length design, and strong turbulence forming conditions are destroyed by combining two sequential control strategies of inverted-sequence stepped heating and discrete pulse circulation; the continuous heating height is limited, the turbulence development time is cut off, the airflow speed near the wall surface is stable, the dust raising amount is reduced, the indoor air quality is improved, the clean requirements of allergic people and infant families are particularly met, and the core pain point of heating dust raising of traditional heating and ventilation equipment is solved.

Description

Technical Field

[0001] This invention relates to the field of HVAC control technology, and in particular to an integrated control method for graphene wall panels based on thermal zone distribution. Background Technology

[0002] With the development of graphene heating technology, segmented graphene wall panels are widely used in home heating and ventilation scenarios due to their advantages such as rapid heating and uniform heat distribution.

[0003] However, existing methods for controlling graphene wall panels still have many technical shortcomings: Traditional control methods often employ a full-area synchronous heating mode, where the entire wall panel heats up, creating a continuous, large characteristic heating surface. This leads to an exponential increase in the Rayleigh number, easily inducing strong turbulence. Strong turbulence stirs up dust from the floor, affecting indoor air quality, and is especially unsuitable for people with allergies and families with infants. The natural upward movement of hot air causes a large amount of heat from traditional wall heating systems to accumulate in the ceiling area, resulting in a hot head and cold feet phenomenon. The heat accumulated at the top is lost to the outside through thermal radiation, resulting in ineffective energy consumption. At the same time, in order to alleviate the temperature imbalance, some solutions add moving parts such as fans, which not only increases energy consumption but also generates noise pollution.

[0004] To address the aforementioned issues, existing technologies mostly improve heating uniformity by optimizing wall panel materials or adding heat dissipation fins, but do not solve the problem at its root by controlling the flow state. The few control schemes based on temperature feedback also fail to introduce dimensionless parameters such as Rayleigh number to achieve quantitative control, thus failing to completely suppress strong turbulence and temperature imbalance.

[0005] Therefore, an integrated control method based on fluid mechanics theory and combined with heat zone distribution is proposed to achieve low dust, constant temperature field and low energy consumption control of graphene wall panels. Summary of the Invention

[0006] The purpose of this invention is to propose an integrated control method for graphene wall panels based on thermal zone distribution in order to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An integrated control method for graphene wall panels based on thermal zone distribution includes: Based on temperature-related air properties and dynamically changing characteristic lengths, the Rayleigh number of the air on the wall panel surface is calculated in real time to determine whether the air is in a laminar or turbulent flow state. Based on the preset critical Rayleigh number and safe Rayleigh number, the flow regime is divided into regions, and corresponding control strategies of full-on, half-power full-on or convection suppression are output. By employing two superimposed control strategies—reverse-sequence stepped heating and discrete pulse cycling—the characteristic length of the heating region can be dynamically adjusted or the time required to cut off turbulence development can be interrupted. An asymmetric power distribution mechanism is established to dynamically adjust the power of each wall panel according to the indoor vertical temperature gradient, thereby offsetting the top heat accumulation effect of natural convection and leveling the indoor vertical temperature difference.

[0008] Preferably, the step of calculating the Rayleigh number of the air on the wall panel surface in real time based on temperature-related air properties and dynamically changing characteristic lengths to determine whether the air is in a laminar or turbulent flow state specifically includes: Input parameters include: gravitational acceleration ; coefficient of thermal expansion of air air kinematic viscosity air thermal diffusivity ; Wall panel surface temperature Average indoor air temperature ; Feature length ; Feature length The value of corresponds one-to-one with the opening combination of the wall panel. Only the vertical height of the continuously opening area is calculated, and the characteristic length of the non-continuously opening wall panel is calculated separately for each segment. Substitute into the standard formula for calculating Rayleigh numbers: ; Parameters are designed for the fixed indoor air pressure characteristic of residential HVAC systems. , , The ratio can be simplified to a coefficient. ,Right now At this point, the simplified formula for calculating the Rayleigh number is: .

[0009] Preferably, the step of dividing the flow regime interval based on a preset critical Rayleigh number and a safe Rayleigh number, and outputting corresponding control strategies for full-on, half-power full-on, or convection suppression, specifically includes: Pre-store critical Rayleigh numbers With safety Rayleigh number Two thresholds; Based on the output results calculated using Rayleigh numbers, airflow regimes are divided, and corresponding control strategies are determined. Simulating a scenario where the entire area is simultaneously activated, the total height of the wall panels is used as the characteristic length, and the maximum temperature difference between each currently detected section of the wall panel and the air is used as the metric. Calculate the potential maximum Rayleigh number at this point. ; according to The relationship between two preset thresholds divides the flow regime into three zones: a stable laminar flow zone, a transition zone, and a turbulent risk zone. The controller outputs the determination result as a digital signal and simultaneously stores the flow state determination log locally. The log content includes the determination time, Numerical values, flow regime range, and output strategy.

[0010] Preferably, the logic for dividing the flow regime into three zones—a stable laminar flow zone, a transition zone, and a turbulent risk zone—is as follows: when ≤ At this time, the flow is in the stable laminar flow region, and the controller executes the fully open mode; when < ≤ At this time, the flow state is in the transition region, and the controller executes the half-power full-on mode; when > When the flow pattern is in the turbulence risk zone, the controller enters the convection suppression mode.

[0011] Preferably, the dynamic adjustment of the characteristic length of the heating region or the interruption of the time required for turbulence development through two superimposed control strategies—reverse-sequence stepped heating and discrete pulse cycling—specifically includes: Strategy A: Reverse step heating: By employing a top-priority heating mode, the thermal barrier formed by the preheated air at the top suppresses the upward momentum of the airflow in the middle and lower sections, thereby reducing the characteristic length. Reduce Rayleigh number to maintain laminar flow.

[0012] Preferably, the method further includes: Strategy B: Discrete Pulse Cycle By cutting off the conditions for turbulence development in the time dimension and taking advantage of the characteristic that turbulence formation requires development time, the airflow field is kept in a dynamic cycle of initiation and collapse by periodically switching the opening state of each wall panel, thus preventing it from developing into strong turbulence.

[0013] Preferably, the establishment of the power distribution mechanism, which dynamically adjusts the power of each wall panel according to the indoor vertical temperature gradient to counteract the top heat accumulation effect of natural convection and level out the indoor vertical temperature difference, specifically includes: Determine whether the system has entered a steady-state operation phase before activating the heat accumulation prevention compensation strategy; The criterion for steady-state operation is: average indoor temperature. The deviation from the set temperature is less than the preset allowable fluctuation range, and the vertical temperature gradient, that is, the difference between the head height temperature and the foot height temperature, is stable for more than the preset time.

[0014] Preferably, the method further includes: Real-time head-height temperature is collected using an air temperature sensor. Foot temperature Calculate the vertical temperature gradient ; when >When the preset threshold is reached, basic asymmetric power distribution is initiated.

[0015] Preferably, the method further includes: The controller is based on the vertical temperature gradient. Dynamically adjust the power ratio according to changes: Multiple temperature gradient control strategies are preset, and each temperature gradient control strategy corresponds to one Based on the obtained Match the corresponding temperature gradient control strategy.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention uses dynamic characteristic length design to match the opening state of the wall panel in real time. It combines two timing control strategies, reverse step heating and discrete pulse cycle, to destroy the conditions for strong turbulence formation. It limits the continuous heating height and cuts off the turbulence development time, so as to stabilize the airflow speed near the wall, reduce the amount of dust, and improve indoor air quality. It is especially suitable for the cleanliness needs of allergy sufferers and families with infants and young children, and solves the core pain point of dust generation in traditional HVAC equipment.

[0017] 2. This invention solves the problem of traditional wall heating systems being hot at the top and cold at the bottom by using an inverted pyramid asymmetric power distribution mechanism and dynamic adjustment strategy. Based on a heat loss model, the heat loss rate of each wall panel is calculated, and the difference in heat loss at different heights is offset by the basic power distribution at different heights. Furthermore, the vertical temperature gradient is dynamically fine-tuned according to the vertical temperature gradient to stabilize and control the indoor vertical temperature gradient. At the same time, this design reduces the radiative loss of ineffective heat accumulation at the top, thereby reducing system energy consumption. Moreover, it requires no additional moving parts, thus balancing human comfort and energy efficiency. Attached Figure Description

[0018] Further details, features, and advantages of this application are disclosed in the following description of exemplary embodiments in conjunction with the accompanying drawings, in which: Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0019] Several embodiments of this application will now be described in more detail with reference to the accompanying drawings to enable those skilled in the art to implement this application. This application may be embodied in many different forms and for various purposes and should not be limited to the embodiments set forth herein. These embodiments are provided to make this application thorough and complete, and to fully convey the scope of this application to those skilled in the art. The embodiments described do not limit this application.

[0020] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It will be further understood that terms such as those defined in commonly used dictionaries shall be interpreted as having a meaning consistent with their meaning in the relevant field and / or the context of this specification, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0021] Example 1

[0022] Its specific implementation method is combined with the appendix Figure 1 Please provide a detailed explanation.

[0023] Appendix Figure 1 The flowchart of the graphene wall panel integrated control method based on thermal zone allocation provided for the embodiments of the present invention shows the complete steps from real-time calculation of the Rayleigh number of the air on the wall panel surface to dynamic adjustment of the power of each wall panel segment according to the indoor vertical temperature gradient.

[0024] In this embodiment, it includes: Based on temperature-related air properties and dynamically changing characteristic lengths, the Rayleigh number of the air on the wall panel surface is calculated in real time, accurately determining whether the air is in a laminar or turbulent flow state, providing a quantitative basis for subsequent control strategies. Specifically, it includes: The input parameters are divided into three categories: constant parameters, semi-constant parameters, and real-time detection parameters. The physical meaning and value rules of each type of parameter are determined based on the classical fluid mechanics theory and the actual working conditions of the household HVAC scenario.

[0025] Input parameters include: gravitational acceleration The value is 9.81m / This value is set with reference to the local standard value of gravitational acceleration, and is stored in the controller so that it does not change with the operating conditions. coefficient of thermal expansion of air air kinematic viscosity air thermal diffusivity The values ​​of these three parameters are strongly correlated with indoor air temperature and need to be dynamically adjusted based on real-time temperature; air thermal expansion coefficient The calculation formula is: air kinematic viscosity With air thermal diffusivity The value depends on the interpolation table built into the controller; Wall panel surface temperature Average indoor air temperature ; Temperature data is collected by a PT1000 platinum resistance temperature sensor that is closely attached to the graphene heating layer, and the temperature range of each section of the wall panel is controlled between 30-60℃. The temperature is obtained by weighting data collected from DS18B20 digital temperature sensors installed at three characteristic heights of 0.1m, 1.0m, and 2.0m indoors. The weighting formula is as follows: after setting weight factors for each height, the temperature at each height is multiplied by its corresponding weight factor, and then summed to obtain the result. ; Feature length Its value is not a fixed total height of the wall panel, but is determined in real time based on the continuous vertical height of the wall panel currently in the open state, which directly determines the accuracy of the Rayleigh number calculation and the flow regime determination.

[0026] Feature length The value of corresponds one-to-one with the opening combination of the wall panel. The core principle is to calculate only the vertical height of the continuously opening area, and to calculate the characteristic length of the non-continuously opening wall panel segment by segment. Detailed explanation: When only the upper section of the wall panel is open, the characteristic length is... It equals the vertical height of the upper section of the wall panel; When the upper and middle wall panels are opened simultaneously, the two wall panels form a continuous heating zone with a characteristic length. It equals the sum of the heights of the upper and middle sections of the wall panel; When only the middle section of the wall panel is opened, the characteristic length is... It equals the vertical height of the middle section of the wall panel; When all three wall panels are opened, the characteristic length Equal to the total height of the wall panels; When the lower and middle wall panels are opened simultaneously, the characteristic length It equals the sum of the heights of the lower and middle sections of the wall panel; When the upper and lower wall panels are not opened continuously, the Rayleigh number needs to be calculated separately for each of the two wall panels corresponding to their respective characteristic lengths, so as to achieve accurate monitoring of the flow state in different heating areas.

[0027] The controller has built-in standard and simplified calculation formulas for Rayleigh numbers, which can be switched according to the computational load and accuracy requirements.

[0028] Substitute into the standard formula for calculating Rayleigh numbers: ; in, The temperature difference between the wall panel surface and the air It is the core driving force that drives air convection; Parameters are designed for the fixed indoor air pressure characteristic of residential HVAC systems. , , The ratio can be simplified to a coefficient. ,Right now At this point, the simplified formula for calculating the Rayleigh number is: This formula can reduce the computational load on the controller.

[0029] By designing dynamic characteristic lengths, precise quantitative determination of the flow state of segmented heating wall panels is achieved, breaking through the limitation that traditional Rayleigh number calculation is only applicable to heating surfaces of fixed lengths. At the same time, the application of simplified calculation formulas takes into account both calculation accuracy and controller performance, providing reliable data support for the real-time execution of subsequent control strategies.

[0030] The flow regime is divided into regions based on the preset critical Rayleigh number and safe Rayleigh number. The corresponding control strategies of full-on, half-power full-on or convection suppression are output. When the sensor fails, it automatically switches to the default laminar flow control mode to ensure stable system operation. Specifically, it includes: The critical Rayleigh number is pre-stored within the controller. With safety Rayleigh number Two key thresholds were determined by combining classic experimental data on natural convection of vertical flat plates with dust test results from residential HVAC scenarios. Critical Rayleigh number It is the critical value for the transition from laminar to turbulent flow. Referring to classical fluid mechanics research conclusions, and combining the wall panel dimensions and heating temperature range of this invention, it is set as follows: When the Rayleigh number exceeds this value, the airflow becomes turbulent, accompanied by significant airflow disturbances and dust.

[0031] Safe Rayleigh number The purpose of this setting is to avoid frequent switching between laminar and turbulent flow patterns; the value is taken as the critical Rayleigh number. 70% of When the Rayleigh number is below this value, the airflow is a stable laminar flow with no obvious airflow disturbance.

[0032] Based on the output of Rayleigh number calculation, airflow regime intervals are divided, and corresponding control strategies are determined. The decision-making logic consists of three consecutive steps: pre-calculation, interval division, and strategy output. The first step is to pre-calculate the Rayleigh number for the full-open mode. The controller first simulates the condition of simultaneous opening of the entire area, using the total height of the wall panels as the characteristic length and the maximum temperature difference between each wall panel and the air as the current detection value. Calculate the potential maximum Rayleigh number at this point. ; The second step is to divide the flow regime into regions, based on... The relationship between two preset thresholds (critical Rayleigh number) With safety Rayleigh number The flow regime is divided into three regions: the stable laminar flow region, the transition region, and the turbulent risk region. The logic is as follows: when ≤ At this time, the flow is in a stable laminar flow region. Even if the entire region is turned on, turbulence will not be induced. The controller executes the full-on mode to pursue the maximum heating rate. when < ≤ At this time, the flow is in the transition zone, where there is a risk of turbulence. The controller executes a half-power full-on mode to reduce the temperature difference by decreasing the power of the wall panel. To suppress the development of turbulence; when > When the flow is in the turbulence risk zone, opening the entire area at this time can easily cause strong turbulence and dust. The controller will force the flow to enter the convection suppression mode and start the reverse / intermittent timing control strategy. The third step is strategy output and feedback. The controller outputs the judgment result as a digital signal to the next step, and at the same time stores the flow judgment log locally. The log content includes the judgment time, Numerical values, flow regime ranges, and output strategies facilitate subsequent troubleshooting and strategy optimization.

[0033] When the sensor detects data outside the normal range or signal loss, the abnormal handling mechanism is automatically triggered, switching to the default laminar flow control strategy, which operates in reverse step heating mode to avoid turbulent dust caused by abnormal data and ensure the safe and reliable operation of the system.

[0034] By employing two superimposed control strategies—reverse-sequence stepped heating and discrete pulse cycle—the characteristic length of the heating zone can be dynamically adjusted or the time required for turbulence development can be cut off, thereby fundamentally disrupting the conditions for the formation of strong turbulence and achieving low-dust heating. Specifically, it includes: Strategy A: Reverse step heating: The core principle of this strategy is to defy conventional heating logic by employing a top-priority heating mode. It utilizes the thermal barrier formed by the preheated air at the top to suppress the upward momentum of the airflow in the middle and lower sections, thereby reducing the characteristic length. Reduce Rayleigh number to maintain laminar flow.

[0035] Taking a wall panel with a total height of 2.4m and three equally divided sections of 0.8m each as an example, the time nodes, power settings, and flow characteristics of its execution steps are all determined based on experiments on the air heating rate.

[0036] At the initial moment With only the upper wall panel activated and the power set to 100%, the surface temperature of the wall panel reaches 55℃. At this point, the characteristic length... The value is 0.8m, and the calculated Rayleigh number is approximately Below the safe Rayleigh number A weak laminar flow forms on the surface of the upper wall panel, which only preheats the air below the ceiling without significant airflow disturbance.

[0037] After a 5-minute warm-up period, proceed with... The time interval is set based on 15. In a closed-room air heating experiment, after the upper wall panel operates at 100% power for 5 minutes, the air temperature below the ceiling can rise by 5°C, forming a stable hot air layer. At this point, with the upper wall panel open and the middle wall panel open, the upper power is reduced to 80%, maintaining a surface temperature of 50°C. The middle power is set to 100%, and the surface temperature reaches 55°C. At this point, the characteristic length... Given that the sum of the heights of the upper and middle sections is 1.6m, the calculated Rayleigh number is approximately... It is still lower than the safe Rayleigh number. The rising airflow generated by the middle section wall panel is blocked by the upper hot air layer, and the flow velocity is limited to less than 0.1m / s.

[0038] After another 5 minutes, enter At all times, keep the upper and middle wall panels open, while simultaneously opening the lower wall panel. Reduce the upper section power to 50% and surface temperature to 45℃, reduce the middle section power to 80% and surface temperature to 50℃, and set the lower section power to 100% and surface temperature to 55℃. At this point, the characteristic length... Given a total wall panel height of 2.4m, the calculated Rayleigh number is approximately... It is in the transition zone; the three wall panels form a layered circulation, without a through-flow high-speed airflow.

[0039] Strategy B: Discrete Pulse Cycle The core principle of this strategy is to cut off the conditions for turbulence development from the time dimension. Taking advantage of the characteristic that turbulence requires 3-5 minutes to develop, the airflow field is kept in a dynamic cycle of initiation and collapse by periodically switching the opening state of each wall panel, thus preventing it from developing into strong turbulence.

[0040] The core of its execution steps is to reasonably set the cycle period and sub-cycle duration. The controller predefines the cycle period. =6 minutes, which is divided into 3 equal sub-cycles, each lasting 2 minutes. This duration is strictly less than the 3-minute critical time for turbulence establishment, ensuring that the airflow collapses due to the heat source being cut off just before entering turbulence.

[0041] During the first 0-2 minutes of sub-cycle 1, only the upper wall panel is activated, with power set to 100% and surface temperature at 55°C, resulting in localized laminar flow on the surface of the upper wall panel. During the second 2-4 minutes of sub-cycle 2, only the middle wall panel is activated, with power set to 100% and surface temperature at 55°C, resulting in localized laminar flow on the surface of the middle wall panel. During the third 3-6 minutes of sub-cycle 3, only the lower wall panel is activated, with power set to 100% and surface temperature at 55°C, resulting in localized laminar flow on the surface of the lower wall panel.

[0042] The controller cycles through sub-cycles 1 to 3. When the indoor temperature approaches the set value, it automatically reduces the power of each wall panel to 50% to maintain a stable temperature.

[0043] The combined use of the two strategies: When the indoor temperature difference is large, specifically the temperature difference between the wall panel and the air (°C), the controller can use two strategies in combination, first executing reverse-sequence stepped heating. - During this phase, after the top thermal air barrier is formed, the system switches to discrete pulse cycle mode to further enhance the convection suppression effect and prevent the generation of strong turbulence.

[0044] During steady-state operation of the system, an inverted pyramid-shaped asymmetric power distribution mechanism is established to dynamically adjust the power of each wall panel according to the indoor vertical temperature gradient, thereby offsetting the top heat accumulation effect of natural convection, leveling the indoor vertical temperature difference, and solving the problem of hot head and cold feet. Specifically, it includes: Traditional wall heaters or radiators use a bottom heating mode, where hot air rises continuously and accumulates in the ceiling area, resulting in a significant temperature gradient in the vertical direction of the room. Experiments have shown that the temperature at head height (2.0m) is 3-5℃ higher than at foot height (0.1m), which seriously affects human comfort. At the same time, heat in the ceiling area is lost through thermal radiation, resulting in energy waste.

[0045] The controller must first determine whether the system has entered a steady-state operation phase before activating the heat accumulation prevention compensation strategy to avoid temperature fluctuations in the initial heating stage.

[0046] The criterion for steady-state operation is: average indoor temperature. If the deviation from the set temperature is less than the preset allowable fluctuation range (±0.5℃), and the vertical temperature gradient, i.e. the difference between the head height temperature and the foot height temperature, is stable for more than the preset time (10 minutes), then the system is determined to have entered a steady state.

[0047] Once the system reaches steady state, the controller initiates an asymmetric power distribution strategy. The core of this strategy is to establish an inverted pyramid-shaped power distribution, which increases the power in the lower section to compensate for the cold air at ground level and decreases the power in the upper section to suppress heat accumulation at the top.

[0048] First, the controller collects the head-height temperature in real time using an air temperature sensor. Foot temperature Calculate the vertical temperature gradient ; when > When the preset threshold (2℃) is reached, the basic asymmetric power distribution is activated, forcibly setting the power of the lower wall panel to 100%, the power of the middle wall panel to 60%, and the power of the upper wall panel to 30%. The power ratio is set based on the heat loss model. The upper wall panel is close to the ceiling, with a heat radiation loss rate of 20%, the middle section has a heat loss rate of 10%, and the lower section has a heat loss rate of 5%. The asymmetric power distribution can accurately offset the heat loss differences at different heights.

[0049] Heat loss model: The total heat loss of each wall panel is decomposed into two parts: radiative heat loss and convective heat loss. After calculating and weighting these parts separately, the overall heat loss rate of each wall panel is obtained. The formula is as follows: ; in, Represents the upper, middle, and lower sections of the wall panel; To account for radiative heat loss, the radiative heat transfer between the wall panel surface and surrounding cold surfaces such as the ceiling and walls is calculated according to the Stefan-Boltzmann law. To account for convective heat loss, Newton's law of cooling is followed to calculate the convective heat transfer between the wall panel surface and the surrounding air. Because the upper wall panel is adjacent to the ceiling, which is a low-temperature cold surface, and the airflow at the top is relatively unobstructed, the proportion of radiative heat loss in the upper section is significantly higher than that in the middle and lower sections. According to calculations, its overall heat loss rate is approximately 20%. The middle section wall panel is located in the center of the interior space. The radiant area of ​​the surrounding cold surface and the intensity of air convection are both at a moderate level, and the overall heat loss rate is about 10%. The lower section of the wall panel is close to the ground, where the heat storage capacity is strong and the air velocity is low, resulting in minimal convective heat loss. The overall heat loss rate is approximately 5%.

[0050] The core objective of the model is to offset heat loss with input power and ensure that the effective heat dissipation of each wall panel into the room is balanced. Therefore, the power distribution ratio is positively correlated with the heat loss rate.

[0051] With a heat loss rate of 5% set as the baseline, the heat loss rate of the middle section is twice that of the lower section (10% / 5%), and the heat loss rate of the upper section is four times that of the lower section (20% / 5%). The power ratio is derived in reverse as lower section: middle section: upper section = 100%: 60%: 30% (this ratio is an engineering optimization value, which is finely adjusted based on the theoretical ratio and human comfort to ensure higher effective heat dissipation at the bottom).

[0052] The controller is based on the vertical temperature gradient. The power ratio is dynamically adjusted according to the changes in temperature gradient to achieve precise control of temperature gradient. Multiple temperature gradient control strategies are preset, and each temperature gradient control strategy corresponds to one Based on the obtained Match the corresponding temperature gradient control strategy, that is: when When the temperature exceeds 3℃, it indicates severe heat accumulation at the top. The controller will reduce the upper power to 20% while maintaining the lower power at 100% to enhance heat suppression at the top and heat compensation at the bottom. If the temperature is below 1℃, it indicates that the top temperature is too low. The controller will increase the power of the upper section to 40% to prevent the feet from overheating and maintain an overall temperature balance.

[0053] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0054] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

[0055] It should be noted that, in this document, the use of relational terms such as "first" and "second" is merely for distinguishing one entity or operation from another, and does not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0056] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0057] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0058] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0059] 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 network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0060] In addition, the functional units in the various embodiments of this application 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.

[0061] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0062] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A graphene wall panel integrated control method based on thermal zone distribution, characterized in that, include: Based on temperature-related air properties and dynamically changing characteristic lengths, the Rayleigh number of the air on the wall panel surface is calculated in real time to determine whether the air is in a laminar or turbulent flow state. Based on the preset critical Rayleigh number and safe Rayleigh number, the flow regime is divided into regions, and corresponding control strategies of full-on, half-power full-on or convection suppression are output. By employing two superimposed control strategies—reverse-sequence stepped heating and discrete pulse cycling—the characteristic length of the heating region can be dynamically adjusted or the time required to cut off turbulence development can be interrupted. An asymmetric power distribution mechanism is established to dynamically adjust the power of each wall panel according to the indoor vertical temperature gradient, thereby offsetting the top heat accumulation effect of natural convection and leveling the indoor vertical temperature difference.

2. The graphene wall panel integrated control method based on thermal zone distribution according to claim 1, characterized in that, Based on temperature-related air properties and dynamically changing characteristic lengths, the Rayleigh number of the air on the wall panel surface is calculated in real time to determine whether the air is in a laminar or turbulent flow state, specifically including: Input parameters include: gravitational acceleration ; coefficient of thermal expansion of air air kinematic viscosity air thermal diffusivity ; Wall panel surface temperature Average indoor air temperature ; Feature length ; Feature length The value of corresponds one-to-one with the opening combination of the wall panel. Only the vertical height of the continuously opening area is calculated, and the characteristic length of the non-continuously opening wall panel is calculated separately for each segment. Substitute into the standard formula for calculating Rayleigh numbers: ; Parameters are designed for the fixed indoor air pressure characteristic of residential HVAC systems. , , The ratio can be simplified to a coefficient. ,Right now At this point, the simplified formula for calculating the Rayleigh number is: .

3. The graphene wall panel integrated control method based on thermal zone distribution according to claim 1, characterized in that, Based on preset critical Rayleigh numbers and safe Rayleigh numbers, the flow regime is divided into intervals, and corresponding control strategies are output for full-on, half-power full-on, or convection suppression. Specifically, these include: Pre-store critical Rayleigh numbers With safety Rayleigh number Two thresholds; Based on the output results calculated using Rayleigh numbers, airflow regimes are divided, and corresponding control strategies are determined. Simulating a scenario where the entire area is simultaneously activated, the total height of the wall panels is used as the characteristic length, and the maximum temperature difference between each currently detected section of the wall panel and the air is used as the metric. Calculate the potential maximum Rayleigh number at this point. ; according to The relationship between two preset thresholds divides the flow regime into three zones: a stable laminar flow zone, a transition zone, and a turbulent risk zone. The controller outputs the determination result as a digital signal and simultaneously stores the flow state determination log locally. The log content includes the determination time, Numerical values, flow regime range, and output strategy.

4. The graphene wall panel integrated control method based on thermal zone distribution according to claim 3, characterized in that, The logic for dividing the flow regime into three regions—the stable laminar region, the transition region, and the turbulent risk region—is as follows: when ≤ At this time, the flow is in the stable laminar flow region, and the controller executes the fully open mode; when < ≤ At this time, the flow state is in the transition region, and the controller executes the half-power full-on mode; when > When the flow pattern is in the turbulence risk zone, the controller enters the convection suppression mode.

5. The graphene wall panel integrated control method based on thermal zone distribution according to claim 1, characterized in that, By employing two superimposed control strategies—reverse-sequence stepped heating and discrete pulse cycling—the characteristic length of the heating region or the time required to cut off turbulence development is dynamically adjusted. Specifically, this includes: Strategy A: Reverse step heating: By employing a top-priority heating mode, the thermal barrier formed by the preheated air at the top suppresses the upward momentum of the airflow in the middle and lower sections, thereby reducing the characteristic length. Reduce Rayleigh number to maintain laminar flow.

6. The graphene wall panel integrated control method based on thermal zone distribution according to claim 5, characterized in that, Also includes: Strategy B: Discrete Pulse Cycle By cutting off the conditions for turbulence development in the time dimension and taking advantage of the characteristic that turbulence formation requires development time, the airflow field is kept in a dynamic cycle of initiation and collapse by periodically switching the opening state of each wall panel, thus preventing it from developing into strong turbulence.

7. The graphene wall panel integrated control method based on thermal zone distribution according to claim 1, characterized in that, Establish a power distribution mechanism to dynamically adjust the power of each wall panel according to the indoor vertical temperature gradient, counteracting the top heat accumulation effect of natural convection and leveling the indoor vertical temperature difference. Specifically, this includes: Determine whether the system has entered a steady-state operation phase before activating the heat accumulation prevention compensation strategy; The criterion for steady-state operation is: average indoor temperature. The deviation from the set temperature is less than the preset allowable fluctuation range, and the vertical temperature gradient, that is, the difference between the head height temperature and the foot height temperature, is stable for more than the preset time.

8. The graphene wall panel integrated control method based on thermal zone distribution according to claim 7, characterized in that, Also includes: Real-time head-height temperature is collected using an air temperature sensor. Foot temperature Calculate the vertical temperature gradient ; when >When the preset threshold is reached, basic asymmetric power distribution is initiated.

9. The graphene wall panel integrated control method based on thermal zone distribution according to claim 8, characterized in that, Also includes: The controller is based on the vertical temperature gradient. Dynamically adjust the power ratio according to changes: Multiple temperature gradient control strategies are preset, and each temperature gradient control strategy corresponds to one Based on the obtained Match the corresponding temperature gradient control strategy.

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