A blinds control method and system based on indoor lighting zoning

Abstract

The present application discloses a blind control method and system based on indoor lighting zoning, which relates to the field of blind control. The control method includes: obtaining the solar azimuth angle, solar altitude angle, and solar radiation intensity at the current moment; determining whether to activate the blinds; if so, activating the blinds, and calculating the solar incident angle at the current moment as the first solar incident angle, and calculating the solar incident angle after a preset time period as the second solar incident angle; and then obtaining the target angles of the first section of blinds, the second section of blinds, and the third section of blinds that meet the solar incident angle constraint and the daylight equivalent transmittance optimization target; and controlling the first section of blinds, the second section of blinds, and the third section of blinds based on the target angles of the first section of blinds, the second section of blinds, and the third section of blinds. The present application improves the blind control effect.

Description

Technical Field

[0001] The present application relates to the field of blinds control, and in particular to a blinds control method and system based on indoor lighting zoning. Background Art

[0002] Building sunshades play an outstanding role in preventing glare from natural light and reducing energy consumption for building lighting, cooling, and heating. How to reasonably control the blinds to minimize the discomfort caused by glare to the indoor environment, while maximizing the advantages of building sunshades in guiding natural light into the room, is the key to the future development of blind control. Building lighting zoning is one of the basic means to understand and control the indoor light environment. The sunshade control strategy for indoor lighting zoning in buildings will provide a feasible way to more precisely and accurately control the indoor light environment, thereby reducing indoor lighting and significantly improving the visual comfort of indoor occupants. At present, relevant patents have noticed the relevant needs and have conducted certain explorations.

[0003] Existing shading technologies can be divided into fixed shading and movable shading. Fixed shading cannot be adjusted according to indoor environmental conditions. Existing movable shading adjustment methods often rely on manual adjustment by indoor personnel. However, indoor personnel have a certain adaptability to the environment. When the indoor environment is very uncomfortable, they will consider adjusting the shading, and it is difficult to adjust to the optimal shading state during adjustment. Furthermore, the lighting requirements of the indoor environment vary significantly depending on the depth. Existing shading control is often integrated. This control strategy cannot meet the different shading requirements of different indoor areas, which limits the energy saving and indoor environment improvement potential of existing shading equipment.

[0004] The invention patent, "Method, System, and Medium for Adaptive Dynamic Control of Building Shading," explores a shading control system focused on building energy conservation. This device adjusts the building's exterior shading by reading real-time information such as outdoor temperature and humidity, indoor illumination, and solar radiation intensity. However, this method fails to consider the varying lighting requirements of different indoor areas and employs a holistic control strategy for blinds. This lacks detailed differentiation and control of the blinds, hindering effective control. Summary of the Invention

[0005] The purpose of this application is to provide a blinds control method and system based on indoor lighting zoning, which improves the blinds control effect by controlling the segmented blinds separately.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a blinds control method based on indoor lighting zoning, the blinds control method comprising:

[0008] Get the current solar azimuth, solar altitude and solar radiation intensity;

[0009] determining whether to activate the blinds based on the current solar azimuth, solar altitude, and solar radiation intensity, to obtain a first determination result;

[0010] If the first judgment result indicates no, the blinds are not opened;

[0011] If the first judgment result indicates yes, the blinds are opened and the following steps are performed:

[0012] Calculate the solar incident angle at the current moment based on the solar azimuth and solar altitude at the current moment as the first solar incident angle, and predict the solar incident angle after a preset time period based on the solar azimuth and solar altitude at the current moment as the second solar incident angle;

[0013] Calculate the angle of the first section of louvers and the angle of the second section of louvers that satisfy the constraint relationship of the second solar incident angle and optimize the equivalent solar transmittance, and use them as the target angle of the first section of louvers and the target angle of the second section of louvers, respectively;

[0014] Calculate the angle of the third section of the blind that satisfies the constraint of the first solar incident angle and optimizes the equivalent daylight transmittance, and use this angle as the target angle for the third section of the blind. The first, second, and third sections of the blind are obtained by dividing the blinds from bottom to top. The first section of the blind corresponds to the indoor glare risk area, the second section of the blind corresponds to the indoor daylighting area, and the third section of the blind corresponds to the indoor artificial lighting compensation area.

[0015] The first section of the louver, the second section of the louver, and the third section of the louver are controlled according to the target angle of the first section of the louver, the target angle of the second section of the louver, and the target angle of the third section of the louver.

[0016] Optionally, the height range of the first section of louvers is 0.75m-1.2m, and the height range of the second section of louvers is 1.2mD×tanθ a , the height range of the third section of the louver is D×tanθ a - upper edge of the blinds; where D is the glare risk distance, θ a It is the solar incident angle corresponding to the lower 5% dividing point of the annual solar incident angle distribution on the facade of the building where the shutters are located.

[0017] Optionally, when calculating the target angle of the first section of blinds, the constraint relationship for satisfying the second solar incidence angle is:

[0018]

[0019] Where β1 is the angle of the first section of louvers, and θ2 is the second solar incidence angle.

[0020] Optionally, when calculating the target angle of the second section of blinds, the constraint relationship for satisfying the second solar incidence angle is:

[0021]

[0022] Wherein, β2 is the angle of the second section of louvers, and θ2 is the second solar incidence angle.

[0023] Optionally, when calculating the target angle of the third section of blinds, the constraint relationship for satisfying the first solar incidence angle is:

[0024]

[0025] Among them, β3 is the angle of the third section of the blinds, θ1 is the first solar incidence angle, h is the vertical distance between the roof and the upper edge of the blinds, and L is the distance between the lighting area and the blinds.

[0026] Optionally, the daylight equivalent transmittance is calculated using a relationship function between the daylight equivalent transmittance and the louver angle.

[0027] Alternatively, under cloudy conditions, the relationship function between the equivalent transmittance of sunlight and the louver angle is:

[0028]

[0029] in, is the equivalent transmittance of sunlight under cloudy conditions, β is the louver angle;

[0030] Under sunny conditions, the relationship function between the equivalent transmittance of sunlight and the angle of the blinds is:

[0031]

[0032] in, is the equivalent transmittance of sunlight under sunny conditions, and θ is the solar incidence angle.

[0033] Optionally, obtain the current solar azimuth, solar altitude, and solar radiation intensity, which also includes:

[0034] Determine whether there is a person in the room and obtain a second determination result;

[0035] If the second judgment result indicates yes, the solar azimuth angle, solar altitude angle and solar radiation intensity at the current moment are obtained.

[0036] In a second aspect, the present application provides a blinds control system based on indoor lighting zoning, the control system comprising: a sun altitude angle sensor, a sun azimuth angle sensor, a solar radiation sensor, and a central control processor;

[0037] The solar altitude angle sensor, the solar azimuth angle sensor and the solar radiation sensor are all connected to the central control processor;

[0038] The central control processor is connected to the control end of the blinds, and the central control processor is used to control the blinds using the above-mentioned blinds control method based on indoor lighting zoning.

[0039] Optionally, the control system further includes: an infrared camera;

[0040] The infrared camera is connected to the central control processor.

[0041] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0042] This application provides a blind control method and system based on indoor lighting zoning. By segmenting the blinds, the system addresses the different daylight control requirements of different indoor zones. By real-time monitoring and calculating the solar azimuth, the system determines the direct sunlight exposure and calculates the target angle for each blind segment. This allows for separate control of each blind segment, improving control effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 This is a flow chart of a blinds control method based on indoor lighting zoning in one embodiment of the present application;

[0045] Figure 2 A control principle diagram of a blinds control method based on indoor lighting zoning provided in one embodiment of the present application;

[0046] Figure 3 A schematic diagram of indoor lighting zones provided in one embodiment of the present application;

[0047] Figure 4 A schematic diagram of the louver segmentation principle provided in one embodiment of the present application;

[0048] Figure 5This is a year-round south-facing elevation incident projection angle distribution diagram for Chongqing, provided in one embodiment of the present application;

[0049] Figure 6 A flow chart of the louver segmentation design provided in one embodiment of the present application;

[0050] Figure 7 A schematic diagram illustrating the reflective characteristics of a louver surface according to an embodiment of the present application;

[0051] Figure 8 A schematic diagram of the critical conditions for direct light to pass through the louvers and illuminate the work surface according to an embodiment of the present application;

[0052] Figure 9 A control principle diagram of the first section of blinds provided in one embodiment of the present application;

[0053] Figure 10 A control principle diagram of the second section of blinds provided in one embodiment of the present application;

[0054] Figure 11 A control principle diagram of the third section of blinds provided in an embodiment of the present application;

[0055] Figure 12 A schematic diagram showing how the equivalent transmittance of sunlight on a cloudy day varies with the angle of the blinds and the angle of incidence of the sun on the facade, provided in one embodiment of the present application;

[0056] Figure 13 A schematic diagram showing how the equivalent transmittance of sunlight on a sunny day varies with the angle of the louvers and the incident projection angle of the sun on the facade, according to an embodiment of the present application;

[0057] Figure 14 A schematic structural diagram of a blinds control system based on indoor lighting zoning provided in one embodiment of the present application. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0060] In an exemplary embodiment, a blinds control method based on indoor lighting zones is provided, such as Figure 1 and Figure 2As shown, the blinds control method includes steps 101 to 108.

[0061] Step 101: Obtain the solar azimuth angle, solar altitude angle, and solar radiation intensity at the current moment.

[0062] Step 102 : determining whether to activate the blinds based on the current solar azimuth, solar altitude, and solar radiation intensity, and obtaining a first determination result.

[0063] Step 103: If the first judgment result indicates no, the blinds are not opened.

[0064] Step 104: If the first judgment result indicates yes, open the blinds and perform the following steps:

[0065] Step 105, calculate the solar incident angle at the current moment according to the solar azimuth angle and solar altitude angle at the current moment, as the first solar incident angle, and predict the solar incident angle after a preset time period according to the solar azimuth angle and solar altitude angle at the current moment, as the second solar incident angle.

[0066] Step 106 , calculating the angles of the first and second sections of the louver that satisfy the constraint of the second solar incident angle and optimize the equivalent solar transmittance, and using them as the target angles of the first and second sections of the louver, respectively.

[0067] Step 107: Calculate the angle of the third section of the blinds that satisfies the constraint of the first solar incident angle and optimizes the equivalent daylight transmittance, and use this angle as the target angle of the third section of the blinds. The first, second, and third sections of the blinds are obtained by dividing the blinds from bottom to top. The first section of the blinds has an incident range corresponding to the indoor glare risk area, the second section of the blinds has an incident range corresponding to the indoor daylighting area, and the third section of the blinds has an incident range corresponding to the indoor artificial lighting compensation area.

[0068] Step 108 : Controlling the first section of louvers, the second section of louvers, and the third section of louvers according to the target angle of the first section of louvers, the target angle of the second section of louvers, and the target angle of the third section of louvers.

[0069] Implementing the above steps 101 to 108 can improve the effect of blind control.

[0070] This application can be divided into two parts. First, a dynamic year-round daylighting assessment process is conducted based on the building form and climate conditions. By analyzing the year-round daylighting autonomy index and indoor glare discomfort index, indoor daylighting zones are divided. Furthermore, the blinds are further segmented according to the building's daylighting zones. Once the blind segmentation design is completed, the basic scheme for blind segment control is to collect information such as the sun's position angle and altitude angle, transmit the relevant information to the processing center, analyze and process it, and then transmit the control signal to the control module, which then adjusts the angle of each blind segment to prevent glare and maximize the indoor lighting effect.

[0071] In terms of louver segmentation:

[0072] First, an assessment of indoor daylight autonomy and glare risk is conducted throughout the year based on the building's form and orientation. Based on the analysis results of daylighting and glare, the interior is zoned for daylighting. The daylighting simulation is performed on a working plane (0.75m from the ground). It mainly determines the percentage of occupied hours in a year above the illuminance threshold at a certain point in the room (assessment starts at 8am and ends at 6pm local time). The indicator DA (Daylight Autonomy) is used to measure whether the daylighting is sufficient. The daylight illuminance threshold is set to 300lux. The indoor area is divided into daylighting areas and artificial lighting distribution areas based on whether the DA value reaches 50%. When the indoor daylighting increases significantly, the probability of glare increases greatly. In order to further distinguish the differences in glare levels within the daylighting zones, further glare analysis and assessment are performed. The glare analysis and assessment is based on the eye level of a sitting person (1.2m from the ground). It mainly determines the percentage of glare occurrence at a certain point in the building that is below the relevant threshold during the building's annual office hours. Glare autonomy (GA) is used for measurement, and the threshold for determining whether glare occurs at a certain point in the room is set at 0.4. The indoor area is further divided into glare risk areas and non-glare risk areas based on whether the GA value is below 95%. The three indoor lighting zones are as follows: Figure 3 shown.

[0073] Then, the sunshade louvers are further designed in sections according to the lighting zones. To ensure the working illumination requirements of the work surface and avoid glare, the vertical distance from the work surface to the human eye level is set as the first section. The illumination measurement point of the work surface is 0.75m from the ground. The human eye level is generally set at 1.20m from the ground. The control range of the first section of the louver is set to 0.75m-1.20m. The light spot caused by direct sunlight hitting the visual plane is the main cause of glare. Figure 4As shown in the figure, when the position of the incident point is constant, the farthest point of the direct sunlight spot formed indoors is related to the magnitude of the solar incident projection angle on the facade. The smaller the solar incident projection angle on the facade, the farther the farthest point of the direct sunlight spot formed on the visual plane is from the window, and the larger the glare risk area. To prevent glare risk, the distance from the window to the direct sunlight spot formed indoors should be minimized. This requires adjusting the direct sunlight entering the room at window heights above this measurement point. The distance from the window to which the incident light forms the farthest point has been determined through glare risk assessment as D. The window height required to adjust this area is based on the definition of spatial glare assessment in the EU standard CEN 17037 (CEN2018) (the probability of daylight glare during 95% of office hours is less than 0.40). The minimum window height is the vertical distance between the glare risk area and the product of the tangent value of the 5% percentile of the solar incident projection angle on the building facade. This means that at this window height, during working hours with direct sunlight, only less than or equal to 5% of the working time will be exposed to direct sunlight in this area, that is, an area of ​​1.2mD×tanθ, where D is the glare risk distance and θ is the solar incident angle corresponding to the lower 5% dividing point of the annual solar incident angle distribution on the building facade where the blinds are located. For example, for the south-facing facade in Chongqing, the 5% percentile is approximately 20.8°. Figure 5 As shown. The window height excluding the first and second sections is used as the third section to redirect the light and fill in the artificial lighting compensation area. In summary, the segmented design process of the blinds is as follows: Figure 6 shown.

[0074] In order to improve the indoor lighting level, it is hoped that the blinds can redirect the direct sunlight shining on their surface, so that the direct light can reach deep into the room. In order to achieve this requirement, the surface of the blinds needs to be mirror reflective. When both sides of the blinds are mirror reflective, it will cause glare risks, and it is not easy to avoid by adjusting the blinds. Even if it is solved, it will lead to a decrease in indoor lighting levels because all the direct sunlight is reflected to the outside space. Therefore, in order to solve this problem, the blinds of the blinds should have different reflective properties, that is, the lower surface of the blinds is a diffuse reflection surface, and the upper surface is a mirror reflection. The specific setting method is as follows: Figure 7 shown.

[0075] In terms of control, that is, the process from step 101 to step 108 in the above embodiment.

[0076] First of all, the sunlight incident on the building facade is mainly composed of three parts: direct sunlight, scattered light from the sky and reflected light from the ground. Direct sunlight hitting the work surface and human eyes may cause glare risks. At the same time, redirecting direct light is beneficial to the lighting of the building depth. Therefore, when performing blinds shading control, segmented control is required according to the purpose of different shading segments.

[0077] The control logic of the first section of the blinds mainly ensures: 1. Preventing direct sunlight from shining on the working surface; 2. Preventing direct sunlight from being reflected by the blinds and shining on the human eyes. Figure 8 As shown, the solar incident projection angle of the facade and the louver inclination angle at this time should satisfy equations (1) and (2). Further solution shows that when the louver angle satisfies the equation, no light will directly pass through the first section of the louver and directly illuminate the working plane, causing discomfort.

[0078]

[0079] β≥90°-2θ (0°≤θ≤90°) (2)

[0080] Where β is the shutter angle, a is the blade width of the shutter, and θ is the solar incidence angle.

[0081] In order to prevent the sun's rays from hitting the blinds and reflecting onto the visual plane to form glare, further restrictions are imposed on the blinds' angles. Consider extreme cases, such as Figure 9 As shown in Figure 1, when the direct light reflected from end A of the louver blade closest to the human eye does not reach the human eye, the direct light reflected from the remaining louvers does not illuminate the human eye. At this time, the relationship between the louver angle and the vertical solar projection angle should satisfy the equation. Because the louver size is much smaller than the room depth, it can be further simplified to equations (3)-(5). It can be concluded that when the reflected light does not illuminate the visual plane, the louver angle must satisfy equations (3)-(5).

[0082]

[0083] tan(θ-2β)≤0 (4)

[0084]

[0085] In summary, the first section of the blinds must satisfy equation (6) to prevent the incident light from directly hitting the working plane, and the light reflected by the blinds will not hit the human eye plane.

[0086]

[0087] The main purpose of the second section of blinds sunshade control is to prevent direct sunlight and light reflected by the blinds from directly hitting the visual plane, such as Figure 10 As shown in Equation (6), when the direct solar angle is greater than 45°, it is necessary to consider the situation where the direct solar light is reflected by the blinds and then enters the visual plane. Similar to the analysis of the blinds in the first section, when the blinds angle satisfies Equation (6), the reflected light will not be transmitted to the visual plane. To prevent direct light from directly passing through the blinds, the blinds angle at all solar incident angles must satisfy the conditions of Equation (7).

[0088] θ-2|β|≥0° (θ>45°) (7)

[0089] In summary, the second section of the blinds must satisfy equation (8) simultaneously to prevent glare on the human eye plane caused by direct sunlight and reflection from the blinds.

[0090]

[0091] The third section of louver shading is mainly to redirect direct sunlight to the artificial lighting compensation area for lighting, improve the lighting level of the artificial lighting compensation area, and reduce the impact of louver shading on indoor lighting. Figure 11 As shown. Considering the extreme case, when the direct sunlight reflected from the end of the louver blade A, which is the closest to the roof, reaches the end of the lighting area, the direct sunlight reflected by the louver falls on the artificial lighting compensation area. At this time, according to the geometric law, the relationship between the louver inclination angle and the vertical solar incident projection angle should satisfy formula (9).

[0092]

[0093] Where: h is the vertical distance between the roof and the upper edge of the window, m; l is the distance between the lighting area and the window, m; a is the width of the blinds, m.

[0094] Since the width of the louver is much smaller than the building depth and vertical distance, the formula is simplified to obtain the shading angle for sunlight redirection, which must satisfy formula (10).

[0095]

[0096] Based on the above analysis, in step 106, when calculating the target angle of the first section of blinds, the constraint relationship of the second solar incident angle is satisfied:

[0097]

[0098] Where β1 is the angle of the first section of louvers, and θ2 is the second solar incidence angle.

[0099] When calculating the target angle of the second section of blinds, the constraint relationship that satisfies the second solar incidence angle is:

[0100]

[0101] Wherein, β2 is the angle of the second section of louvers, and θ2 is the second solar incidence angle.

[0102] In the above step 107, when the target angle of the third section of the blinds is set, the constraint relationship of the first solar incident angle is satisfied as follows:

[0103]

[0104] Among them, β3 is the angle of the third section of the blinds, θ1 is the first solar incidence angle, h is the vertical distance between the roof and the upper edge of the blinds, and L is the distance between the lighting area and the blinds.

[0105] The purpose of the technical solution of this application is to maximize the use of daylight while avoiding glare to the human eye caused by direct sunlight. The upper and lower limits of the angle to prevent glare were determined through the analysis of sunshade blinds. In order to further determine the optimal blinds angle to improve the indoor lighting level, the concept of daylight equivalent transmittance was introduced, and the average of the illuminance measured between the outer surface of the window and the blinds was divided by the illuminance value measured by the facade sensor to determine the daylight equivalent transmittance of the blinds. The simulation method was used to evaluate the size of the daylight equivalent transmittance under different blinds angles. During the simulation process, two space models, cloudy and sunny, were used for simulation and evaluation. Under cloudy conditions, the main light is diffuse light, while under sunny conditions, the main light is direct light. The changes of cloudy daylight equivalent transmittance with blinds angle and facade solar incident angle are shown as follows. Figure 12 As shown, Figure 12 (a) is used to characterize the relationship between the equivalent transmittance of sunlight and the incident angle of the facade at different louver angles. Figure 12 (b) is used to characterize the relationship between the equivalent transmittance of sunlight and the louver angle under different facade solar incident projection angles, which is Figure 12 It can be seen that the equivalent daylight transmittance on a cloudy day is independent of the solar incident projection angle on the facade and is only related to the louver angle. For all solar incident projection angles on the facade, the equivalent daylight transmittance reaches its maximum value at a louver angle of approximately -45°. In a diffuse light environment, that is, under cloudy conditions, the variation of the equivalent daylight transmittance with the louver angle is shown in Equation (11).

[0106]

[0107] Figure 13 The figure shows the change of equivalent transmittance of sunlight on a sunny day with the angle of the louver and the incident angle of the sun on the facade. Figure 13 (a) is used to characterize the relationship between the equivalent transmittance of sunlight and the incident angle of the facade at different louver angles. Figure 13 (b) is used to characterize the relationship between the equivalent transmittance of sunlight and the angle of the blinds under different solar incident projection angles on the facade. Figure 13As shown in Figure 1, for a clear sky, the facade solar incident projection angle has a significant effect on the daylight equivalent transmittance. When the louver inclination angle is negative, the smaller the facade solar incident projection angle, the greater the visible light transmittance. When the louver angle is greater than 30°, the larger the facade solar incident projection angle, the smaller the visible light transmittance. The maximum daylight equivalent transmittance is obtained when θ is 15° and β is 0°. Combining the daylight equivalent transmittance at all facade solar incident projection angles, the daylight equivalent transmittance reaches the maximum value when the louver angle is 0°. This value gradually decreases as the solar façade incident projection angle increases. The relationship between daylight equivalent transmittance, louver angle, and facade solar incident projection angle is obtained using regression technology, as shown in Equation (12).

[0108] X s clear =(1.0032×10 -6 β 2 +5.01×10 -6 β+0.0031)θ 2

[0109] +(1.44×10 -4 β 2 -0.0027β-0.4586)θ(12)

[0110] -0.012β 2 -0.0072β+73.91

[0111] Frequent adjustment of louvers can effectively meet indoor lighting requirements, but this can cause noise and visual disturbance to occupants and shorten product lifespan. Therefore, the frequency of louver adjustment should be limited. The adjustment frequency for the first and second louvers is set to 20 minutes to avoid visual disturbance to occupants. There is no limit for the third louver.

[0112] In summary, the blinds control method based on indoor lighting zoning, such as Figure 2As shown, the infrared camera first determines whether there are people inside the room. If so, the blinds are controlled. Whether the sunshade should be activated is determined by whether the building facade is directly exposed to sunlight (determined by combining the solar incident angle, calculated from the relationship between the sun's spatial position and the building facade, and whether the building facade is directly exposed to sunlight). If the building facade is not directly exposed to sunlight, the blinds will not activate; if the building facade is directly exposed to sunlight, the blinds will activate. Because the sun's spatial position varies over time, the blind angle selection for the first and second blinds should consider advance adjustment. The first and second blinds determine the solar projection angle of the facade by calculating the relationship between the building facade and the solar spatial position 20 minutes later. The third blinds determine the facade projection angle of the facade by calculating the relationship between the building facade and the solar spatial position at that moment. The control range for preventing glare for each of the three blinds is obtained, and the optimal blind angle is further determined based on the equivalent daylight transmittance obtained through fitting.

[0113] This embodiment of the application conducts a year-round dynamic simulation to evaluate daylighting and analyze glare risk. The results reveal a significant overlap between daylighting areas and glare risk areas, with glare considerations primarily focused on these overlapping areas. The room is divided into an artificial lighting compensation area, a daylighting area, and a glare risk area based on depth. Based on the year-round distribution of solar incidence angles on different facades, the blinds are divided into three sections, each performing a different function.

[0114] Through theoretical analysis, the embodiments of the present application have obtained the control range of each section of the blinds without generating glare under different solar incident angles. The first section of the blinds mainly controls the glare from the human eye to the work surface. The second section of the blinds mainly adjusts the glare risk area. The third section of the blinds plays the role of blind redirection, reflecting sunlight to the artificial lighting compensation area where natural lighting is scarce. When adjusting the blinds, in order to ensure the timeliness of the adjustment and prevent too frequent adjustments, the adjustment step size of the first and second sections of the blinds is set to 20 minutes. The spatial position of the sun changes with time, so the first section of the blinds and the second section of the blinds take into account the advance adjustment of the angle when selecting the blinds. The third section of the blinds adjusts to the angle that is most conducive to light guidance over time.

[0115] This embodiment of the application utilizes different designs for the upper and lower surfaces of the louvers. To better guide light and prevent glare, the upper surface is configured for specular reflection, while the lower surface is configured for diffuse reflection. Simultaneously, through simulation and evaluation, a model for equivalent daylight transmittance on cloudy and sunny days was established. By obtaining information such as the sun's spatial position and radiation intensity, the optimal louver angle can be determined to maximize the equivalent daylight transmittance and maximize the building's natural lighting efficiency.

[0116] Furthermore, a key point of this application is that the research only considers the sun's position, solar radiation intensity, and occupancy status during monitoring. It primarily employs a combination of theoretical analysis and simulation evaluation, ensuring the feasibility of this application in practical applications while maintaining control accuracy. The control logic of this application can be summarized as monitoring, calculation, and execution, making the blinds' control more rigorous, scientific, sensitive, and realistic.

[0117] This application studies the causes of indoor glare when blinds are adjusted through a method that combines software simulation and theoretical analysis. It obtains indoor lighting zoning based on the annual lighting volume and glare risk analysis, determines the segmentation of blinds, and proposes a blinds segmentation control strategy, aiming to avoid glare while reducing the impact on indoor lighting levels, thereby improving the comfort of the building's indoor lighting environment and energy efficiency.

[0118] Compared to previous inventions, this application innovatively first analyzes daylight intake and glare throughout the year to identify different daylighting zones. Sunshade louvers are then designed in sections for each of these zones. Theoretical analysis accurately identifies the source of glare, and the louver angle control ranges for preventing glare are determined for the first and second sections. Furthermore, to maximize indoor daylight intake, an analysis of equivalent daylight transmittance at different shading angles is performed, allowing the optimal louver angle to be selected to maximize daylight intake and minimize glare.

[0119] Through real-time monitoring, segmented control, and real-time response, the blinds' ability to precisely adjust the indoor lighting environment is greatly enhanced, significantly improving the comfort of the indoor lighting environment. By redirecting daylight and selecting blind angles that maximize daylight equivalent transmittance, this application can reduce lighting energy consumption and improve the uniformity of light distribution in different areas of the room.

[0120] In an exemplary embodiment, Figure 14 As shown, a blinds control system based on indoor lighting zoning is provided, the control system includes: an infrared camera, a solar altitude angle sensor, a solar azimuth angle sensor, a solar radiation sensor and a central control processor; the infrared camera, the solar altitude angle sensor, the solar azimuth angle sensor and the solar radiation sensor are all connected to the central control processor; the central control processor is connected to the control end of the blinds, and the central control processor is used to control the blinds using the above-mentioned blinds control method based on indoor lighting zoning.

[0121] The control system in the embodiment of the present application monitors whether there are people in the room through an infrared camera, detects the size of the solar altitude angle in real time through a solar altitude angle sensor, detects the size of the solar azimuth angle in real time through a solar azimuth angle sensor, and detects the size of the solar radiation intensity in real time through a solar radiation sensor. The central controller collects the above signals and comprehensively calculates the angles of different segmented shading to minimize the glare effect of the indoor environment and improve the indoor lighting environment.

[0122] The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, and the like.

[0123] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A blinds control method based on indoor lighting zoning, characterized in that: The blinds control method based on indoor lighting zoning includes: Get the current solar azimuth, solar altitude and solar radiation intensity; determining whether to activate the blinds based on the current solar azimuth, solar altitude, and solar radiation intensity, to obtain a first determination result; If the first judgment result indicates no, the blinds are not opened; If the first judgment result indicates yes, the blinds are opened and the following steps are performed: Calculate the solar incident angle at the current moment based on the solar azimuth and solar altitude at the current moment as the first solar incident angle, and predict the solar incident angle after a preset time period based on the solar azimuth and solar altitude at the current moment as the second solar incident angle; Calculate the angle of the first section of louvers and the angle of the second section of louvers that satisfy the constraint relationship of the second solar incident angle and optimize the equivalent solar transmittance, and use them as the target angle of the first section of louvers and the target angle of the second section of louvers, respectively; Calculate the angle of the third section of the blind that satisfies the constraint of the first solar incident angle and optimizes the equivalent daylight transmittance, and use this angle as the target angle for the third section of the blind. The first, second, and third sections of the blind are obtained by dividing the blinds from bottom to top. The first section of the blind corresponds to the indoor glare risk area, the second section of the blind corresponds to the indoor daylighting area, and the third section of the blind corresponds to the indoor artificial lighting compensation area. The first section of the louver, the second section of the louver, and the third section of the louver are controlled according to the target angle of the first section of the louver, the target angle of the second section of the louver, and the target angle of the third section of the louver.

2. The blinds control method based on indoor lighting zoning according to claim 1, characterized in that: The height range of the first section of louvers is 0.75m-1.2m, and the height range of the second section of louvers is 1.2mD×tanθ a m, the height range of the third section of louvers is D×tanθ a m is the upper edge of the blinds; D is the glare risk distance, θ a It is the solar incident angle corresponding to the lower 5% dividing point of the annual solar incident angle distribution on the facade of the building where the shutters are located.

3. The blinds control method based on indoor lighting zoning according to claim 1, characterized in that: When calculating the target angle of the first section of blinds, the constraint relationship for the second solar incidence angle is: Where β1 is the angle of the first section of louvers, and θ2 is the second solar incidence angle.

4. The blinds control method based on indoor lighting zoning according to claim 1, characterized in that: When calculating the target angle of the second section of blinds, the constraint relationship that satisfies the second solar incidence angle is: Wherein, β2 is the angle of the second section of louvers, and θ2 is the second solar incidence angle.

5. The blinds control method based on indoor lighting zoning according to claim 1, characterized in that: When calculating the target angle of the third section of blinds, the constraint relationship that satisfies the first solar incidence angle is: Among them, β3 is the angle of the third section of the blinds, θ1 is the first solar incidence angle, h is the vertical distance between the roof and the upper edge of the blinds, and L is the distance between the lighting area and the blinds.

6. The blinds control method based on indoor lighting zoning according to claim 1, characterized in that: The daylight equivalent transmittance is calculated using the relationship function between the daylight equivalent transmittance and the louver angle.

7. The blinds control method based on indoor lighting zoning according to claim 6, characterized in that: Under cloudy conditions, the relationship function between the equivalent transmittance of sunlight and the angle of the blinds is: in, is the equivalent transmittance of sunlight under cloudy conditions, β is the louver angle; Under sunny conditions, the relationship function between the equivalent transmittance of sunlight and the angle of the blinds is: in, is the equivalent transmittance of sunlight under sunny conditions, and θ is the solar incidence angle.

8. The blinds control method based on indoor lighting zoning according to claim 1, characterized in that: Get the current solar azimuth, solar altitude, and solar radiation intensity. Previously, it also included: Determine whether there is a person in the room and obtain a second determination result; If the second judgment result indicates yes, the solar azimuth angle, solar altitude angle and solar radiation intensity at the current moment are obtained.

9. A blinds control system based on indoor lighting zoning, characterized in that: The control system includes: a sun altitude angle sensor, a sun azimuth angle sensor, a solar radiation sensor and a central control processor; The solar altitude angle sensor, the solar azimuth angle sensor and the solar radiation sensor are all connected to the central control processor; The central control processor is connected to the control end of the blinds, and the central control processor is used to control the blinds using the blinds control method based on indoor lighting zoning according to any one of claims 1 to 8.

10. The blinds control system based on indoor lighting zoning according to claim 9, characterized in that: The control system further includes: an infrared camera; The infrared camera is connected to the central control processor.

Images