Sunlight irradiation temperature rise test method

Abstract

The invention discloses a sunlight irradiation temperature rise test method, which comprises the following steps of: determining an area proportion among different light receiving surfaces of a to-be-tested product according to geometrical characteristics of the to-be-tested product; determining a corresponding sunlight perpendicular incidence angle when the total irradiation energy received by the to-be-detected product reaches the maximum value based on the area proportion; determining the sunlight irradiance of different light receiving surfaces of the to-be-detected product according to the sunlight perpendicular incidence angle; establishing an equivalent temperature rise model of the bath heater light irradiance and the sunlight irradiance; converting the sunlight irradiance into bath heater light irradiance of a corresponding bath heater light source based on an equivalent temperature rise model; and according to the bath heater light irradiance, controlling a bath heater light source to irradiate the light receiving surface of the to-be-tested product. A xenon lamp is replaced by the bath heater, so that the test cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of testing products to be tested, and in particular to a method for testing temperature rise under sunlight irradiation. Background Art

[0002] In the reliability testing of outdoor electrical equipment (such as inverters and combiner boxes), the temperature rise effect caused by solar radiation is one of the core indicators for evaluating the thermal performance of the product under test.

[0003] Traditional testing methods generally use xenon lamps to simulate the solar spectrum, but xenon lamps are expensive. Summary of the Invention

[0004] The present invention provides a method for testing temperature rise under sunlight irradiation, which uses a bathroom heater to replace a xenon lamp and reduces testing costs.

[0005] The present invention provides a method for testing temperature rise induced by solar radiation, comprising: determining the area ratio between different light-receiving surfaces of a product to be tested according to the geometric characteristics of the product to be tested; determining the angle of direct sunlight corresponding to when the total radiation energy received by the product to be tested reaches a maximum value based on the area ratio; determining the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight; establishing an equivalent temperature rise model of the heater light irradiance and the solar irradiance; based on the equivalent temperature rise model, converting the solar irradiance into the heater light irradiance of the corresponding heater light source; and controlling the heater light source to irradiate the light-receiving surface of the product to be tested according to the heater light irradiance.

[0006] Optionally, the light-receiving surface includes a maximum side surface and a top surface; and the step of determining the area ratio between different light-receiving surfaces of the product to be tested according to the geometric characteristics of the product to be tested includes: calculating the area ratio r of the maximum side surface to the top surface using a geometric area calculation method according to the geometric structure parameters of the product to be tested, where r = S side / S top, S side is the area of the maximum side surface of the product to be tested, and S top is the area of the top surface of the product to be tested.

[0007] Optionally, the step of determining the angle of direct sunlight corresponding to when the total radiation energy received by the product to be tested reaches a maximum value based on the area ratio includes: according to the area ratio, using a numerical optimization method, under the constraint condition 0°≤θ≤90°, calculating the maximum value of the total radiation energy, and outputting the corresponding angle of direct sunlight; total radiation energy Qt(θ)=Id(θ)+r×Ic(θ); wherein θ represents the angle of direct sunlight, Id represents the solar irradiance on the top surface of the product to be tested, Ic represents the solar irradiance on the largest side of the product to be tested, and r represents the area ratio of the largest side to the top surface.

[0008] Optionally, the light-receiving surface includes a maximum side surface and a top surface; and the step of determining the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight includes:

[0009] The irradiance of sunlight on the top surface of the product to be tested

[0010] The solar irradiance on the largest side of the product to be tested

[0011] Where I represents the maximum ground irradiance, which is generally 1090w / m 2 ; θ represents the angle of direct sunlight, and α is the inclination angle of the product to be tested relative to the vertical plane when it is installed.

[0012] Optionally, the steps of establishing an equivalent temperature rise model of the heater light irradiance and the sunlight irradiance include: real-time monitoring of the temperature rise data of the heater light irradiance and the sunlight irradiance on the product to be tested of the same material, and fitting the conversion equation of the heater light irradiance and the sunlight irradiance based on the linear regression analysis method.

[0013] Alternatively, the conversion equation is:

[0014]

[0015] Among them, I1 represents the irradiance of the bathroom light, and I2 represents the irradiance of the sunlight.

[0016] Optionally, according to the irradiance of the bathroom heater light, the bathroom heater light source is controlled to irradiate the light-receiving surface of the product to be tested. The steps to complete the temperature rise test include: according to the irradiance of the bathroom heater light, adjusting the number of bathroom heater light sources, the distance between the bathroom heater light source and the product to be tested, and the installation height of the bathroom heater light source, so that the bathroom heater light is evenly irradiated to the top surface and the largest side surface of the product to be tested.

[0017] Optionally, when adjusting the bathroom heater light source, the following uniformity requirements must be met: take points at the edge and center of the product shell to be tested, and the average irradiance of each point shall not be lower than the irradiance of the bathroom heater light; the minimum irradiance value at each point shall not be lower than 80% of the irradiance of the bathroom heater light.

[0018] Optionally, after the step of controlling the heater light source to irradiate the light-receiving surface of the product to be tested according to the heater light irradiance, the solar radiation temperature rise test method further includes: collecting temperature data of the product to be tested during the irradiation process in real time through a temperature sensor.

[0019] Optionally, after the step of collecting temperature data of the product to be tested during the irradiation process in real time through a temperature sensor, the solar radiation temperature rise test method also includes: analyzing and processing the temperature data collected by the temperature sensor, generating a temperature rise curve of the product to be tested under the irradiation of the bathroom heater light, and evaluating the heat resistance of the product to be tested based on the temperature rise curve.

[0020] The solar radiation temperature rise test method provided by the embodiment of the present invention breaks through the limitation of traditional testing that only focuses on the irradiation of a single top surface by quantifying the area ratio of different light-receiving surfaces of the product to be tested and solving the direct sunlight angle corresponding to the maximum irradiation energy, and solves the problem of irradiation energy simulation distortion caused by the geometric characteristics of the product (such as the large proportion of the side area), so that the test can truly reflect the actual temperature rise in complex outdoor lighting scenes. By establishing an equivalent temperature rise model of bathroom heater light and sunlight, low-cost bathroom heater light sources with different spectral characteristics are converted into equivalent solar irradiance, which solves the problem of inconsistent material heat absorption efficiency caused by differences in light source spectra, ensures that the temperature rise test results under different light sources are physically equivalent, and improves the reliability of the test method. By replacing traditional high-priced xenon lamps with bathroom heater light sources and constructing a universal irradiation simulation method based on product geometric characteristics and installation angles, the engineering application problems of lack of adaptation equipment for large products and high cost of xenon lamps are solved, significantly reducing the equipment threshold and implementation cost of solar radiation temperature rise testing, and broadening the scope of application of the test method.

[0021] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a flow chart of a solar radiation temperature rise testing method provided by an embodiment of the present invention;

[0024] Figure 2 This is a flow chart of another solar radiation temperature rise testing method provided by an embodiment of the present invention;

[0025] Figure 3 This is a typical top and side schematic diagram provided by an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the irradiance of sunlight irradiating the top and side surfaces of a product to be tested, provided by an embodiment of the present invention;

[0027] Figure 5 This is a graph showing the relationship between solar irradiance and the temperature rise of the housing of the product to be tested, provided by an embodiment of the present invention;

[0028] Figure 6 This is a curve diagram of the irradiance of a bathroom heater and the temperature rise of the housing of the product to be tested, provided by an embodiment of the present invention;

[0029] Figure 7 This is a curve diagram of the conversion between the irradiance of a bathroom heater and the irradiance of sunlight provided by an embodiment of the present invention;

[0030] Figure 8 This is a flow chart of another solar radiation temperature rise testing method provided by an embodiment of the present invention;

[0031] Figure 9 This is a flow chart of another solar radiation temperature rise testing method provided by an embodiment of the present invention;

[0032] Figure 10 This is a flow chart of another solar radiation temperature rise testing method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product under test, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products under test, or apparatus.

[0035] Figure 1 This is a flow chart of a solar radiation temperature rise test method provided by an embodiment of the present invention. This embodiment can be applied to test the reliability of outdoor electrical equipment (such as inverters and combiner boxes). The method of this embodiment can be executed by a control device of the outdoor electrical equipment, and the control device can be implemented in software and / or hardware. Figure 1 As shown, the solar radiation temperature rise test method includes:

[0036] S101. Determine the area ratios between different light-receiving surfaces of the product to be tested based on geometric features of the product to be tested.

[0037] Geometric characteristics: refers to the physical parameters of the product to be tested, such as shape, size, length, width, height, inclination, etc., which are used to describe its spatial structure.

[0038] Light-receiving surface: The surface of the product to be tested that receives light under sunlight, generally including the side surface (such as the side surface of a rectangular parallelepiped) and the top surface (such as the top surface of a rectangular parallelepiped).

[0039] Area ratio: The ratio of the areas of different light-receiving surfaces, such as the ratio of the largest side area to the top area.

[0040] In one embodiment, the maximum side and top surface areas can be calculated based on the geometric parameters of the product being tested (e.g., length, width, height, and inclination) using geometric methods (e.g., plane projection, 3D modeling). This area ratio calculation avoids errors caused by assuming uniform irradiation, making the temperature rise test more accurate to actual operating conditions.

[0041] S102 : Determine, based on the area ratio, the angle of direct sunlight corresponding to when the total irradiation energy received by the product to be tested reaches a maximum value.

[0042] The total radiation energy refers to the sum of the solar radiation energy received by all the light-receiving surfaces of the product to be tested.

[0043] The angle of direct sunlight refers to the component of the incident angle of sunlight perpendicular to the horizontal ground.

[0044] In some embodiments, based on the area ratio r, under the constraint of 0°≤θ≤90°, the maximum total irradiance energy is calculated and the corresponding angle of direct sunlight is output. This angle balances the irradiance energy contributions from the top and sides, ensuring that the test conditions simulate the extreme scenarios of actual outdoor irradiance.

[0045] Total irradiation energy Qt(θ)=Id(θ)+r×Ic(θ);

[0046] Wherein, θ represents the angle of direct sunlight, Id represents the solar irradiance on the top surface of the product to be tested, Ic(θ) represents the solar irradiance on the largest side surface of the product to be tested, and r represents the area ratio of the largest side surface to the top surface.

[0047] S103. Determine the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight.

[0048] In some embodiments, the first irradiance and the second irradiance of the product to be tested are determined based on the angle of direct sunlight. The first irradiance is the irradiance of sunlight received by the top surface of the product to be tested, i.e., the irradiance of sunlight on the top surface of the product to be tested, and the second irradiance is the irradiance of sunlight received by the largest side of the product to be tested, i.e., the irradiance of sunlight on the largest side of the product to be tested.

[0049] S104. Establish an equivalent temperature rise model between the irradiance of the bathroom heater and the irradiance of the sun.

[0050] To establish an equivalent temperature rise model of bathroom heater light irradiance and solar light irradiance, we must first design an experiment, select the same test samples, and irradiate them with sunlight and bathroom heater light respectively while keeping the environmental factors except the light source consistent; then use temperature sensors and irradiance measuring instruments to synchronously collect the temperature of the samples at different irradiation times and the corresponding solar light and bathroom heater light irradiance data; then analyze the collected data to find out the relationship between bathroom heater light irradiance, solar light irradiance and sample temperature rise; finally, use a suitable mathematical fitting method to derive a conversion equation that can reflect the bathroom heater light irradiance and solar light irradiance based on the analysis results, so as to establish an equivalent temperature rise model.

[0051] S105. Based on the equivalent temperature rise model, convert the solar light irradiance into the corresponding bathroom light irradiance of the bathroom light source.

[0052] Substitute the solar irradiance calculated based on factors such as the vertical angle of sunlight into the conversion equation. By calculating and solving the equation, we can obtain the irradiance of the corresponding bathroom heater light source that needs to be achieved under equivalent temperature rise conditions. This can be used as the basis for controlling the irradiation of the bathroom heater light source to ensure that solar irradiation can be simulated to achieve temperature rise testing of the product to be tested.

[0053] S106. According to the irradiance of the Yuba light, control the Yuba light source to irradiate the light-receiving surface of the product to be tested.

[0054] After obtaining the irradiance of the bathroom heater light converted from the equivalent temperature rise model, it is necessary to adjust the number of bathroom heater light sources, adjust the distance between the light source and the product to be tested, change the installation height of the light source, etc. based on this value, and combine the optical light uniformity device to precisely control the irradiation intensity and distribution of the bathroom heater light source. Through such adjustments, it is ensured that the bathroom heater light can evenly and stably illuminate the light-receiving surface of the product to be tested, so that the irradiance at various points on the light-receiving surface is as close as possible to the bathroom heater light irradiance, and meets the pre-set uniformity requirements, such as the average irradiance of the edge and center sampling points of the shell of the product to be tested is not less than the bathroom heater light irradiance, and the minimum value is not less than 80% of the bathroom heater light irradiance, etc., so that the bathroom heater light source simulates sunlight, realizes irradiation of the product to be tested, and completes the temperature rise test.

[0055] Figure 2 This is a flow chart of another method for testing temperature rise under solar radiation provided by an embodiment of the present invention. Figure 2 As shown, the solar radiation temperature rise test method includes:

[0056] S201. Calculate the ratio r of the area of the largest side surface to the area of the top surface based on the geometric structural parameters of the product to be tested using a geometric area calculation method, where r = Sside / Stop, where Sside is the area of the largest side surface of the product to be tested, and Stop is the area of the top surface of the product to be tested.

[0057] Specifically, in the solar radiation temperature rise test method, the selection of the area ratio of the maximum side surface and the top surface is based on comprehensive considerations of test accuracy, simulation of actual conditions, and simplification of calculations.

[0058] In outdoor environments, the top and side surfaces of the product under test primarily receive sunlight. Selecting the ratio of the largest side surface to the top surface more accurately simulates the sunlight exposure the product will experience in real-world applications. Different products under test have varying shapes, and the relationship between the top and side surfaces affects the amount of sunlight received. For example, some outdoor equipment may have a small top surface but large side surfaces. In this case, the sides receive a larger proportion of sunlight heat. Conversely, products with a large top surface may receive more sunlight heat on the top surface. By determining the ratio of the largest side surface to the top surface, we can rationally distribute the amount of radiation received by different surfaces based on the actual shape of the product under test. This allows us to accurately calculate the irradiance and angle at which the product absorbs the most heat, making the test more realistic. Furthermore, the surface shapes of actual products under test are complex. Calculating irradiance by considering the area ratios of all surfaces would be extremely cumbersome or even impossible. Selecting the largest side surface and the top surface as the primary light-receiving surfaces significantly simplifies the calculation process while ensuring test accuracy.

[0059] Some products to be tested are installed vertically, and the top and side surfaces are easy to distinguish; some products to be tested are installed at an angle, and the top and side surfaces are difficult to distinguish. In the embodiment of the present invention, the top and side surfaces can be defined visually or by other logic. Figure 3 It is a typical top and side schematic diagram provided by an embodiment of the present invention.

[0060] S202. According to the area ratio, a numerical optimization method is used to calculate the maximum value of the total irradiation energy under the constraint condition of 0°≤θ≤90°, and the corresponding angle of direct sunlight is output.

[0061] Numerical optimization methods refer to the computational process of finding the extreme value of the objective function through mathematical algorithms (such as gradient descent and programming solver). Here, they are used to solve the maximum value of the total irradiation energy.

[0062] The total irradiance energy refers to the sum of the solar irradiance energy received by all the light-receiving surfaces of the product to be tested, and the formula is: Qt(θ)=Id(θ)+r×Ic(θ); where θ represents the angle of direct sunlight, Id represents the irradiance of sunlight on the top surface of the product to be tested, Ic(θ) represents the irradiance of sunlight on the largest side of the product to be tested, and r represents the area ratio of the largest side to the top surface.

[0063] It should be noted that when the total radiation energy reaches its maximum value, the corresponding angle of direct sunlight is the optimal test angle.

[0064] For example, the top surface area of an outdoor inverter is Stop = 2m 2 , maximum side area S side = 3m 2 , area ratio = 3 / 2 = 1.5.

[0065]

[0066] Where I is the maximum solar irradiance on the ground, 1090w / m 2 α is the inclination angle of the product under test from the vertical plane when it is installed. In this embodiment, it is 15°. θ is the angle between the sun and the vertical plane. Use Excel to calculate the maximum value of the formula, with the variable parameter θ. Use the planning and solving tool in Excel to calculate the corresponding total irradiance energy when it reaches the maximum value: θ = 41°, Id = 605w / m 2 , Ic=907w / m 2 .

[0067] In the embodiment of the present invention, the maximum solar irradiance I is selected to be 1090w / m 2 In practice, the maximum irradiance at different altitudes and latitudes is different. To simplify the application, the embodiment of the present invention does not consider such differences.

[0068] The irradiance is maximum when the sun is perpendicular to the ground, and the irradiance decreases when the sun is inclined to the vertical. In the embodiment of the present invention, the irradiance of the sun's oblique radiation is calculated without considering the reduction of the irradiance I caused by the sun's inclination angle. From the perspective of engineering application, the deviation is not large (actual measurement). Another feasible way is to let the solar irradiance = f(θ) (parabola, the highest point is 1090w / m 2 ), so that the calculation and test results are more accurate.

[0069] In the calculation of the embodiment of the present invention, the installation tilt angle α of the product to be tested is included in the calculation but does not actually affect the irradiance during the test because α only affects the calculated solar tilt angle θ and does not affect the irradiance value. One feasible approach is to remove the tilt angle α.

[0070] S203. Determine the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight.

[0071] Figure 4 This is a schematic diagram of the irradiance of sunlight irradiating the top and side surfaces of the product to be tested, provided by an embodiment of the present invention. Figure 4 As shown, the first irradiance and the second irradiance of the product to be tested are determined according to the vertical angle of sunlight. The first irradiance is the irradiance of sunlight received by the top surface of the product to be tested, and the second irradiance is the irradiance of sunlight received by the largest side of the product to be tested.

[0072] The irradiance of sunlight on the top surface of the product to be tested

[0073] The solar irradiance on the largest side of the product to be tested

[0074] S204. Real-time monitoring of the temperature rise data of the product to be tested due to the irradiance of the heater light and the irradiance of the sunlight on the same material. Based on the linear regression analysis method, a conversion equation between the irradiance of the heater light and the irradiance of the sunlight is fitted.

[0075] At the same time, the temperature rise data of the product to be tested made of the same material under the irradiation of Yuba light and sunlight is monitored. Since the spectrum of Yuba light is different from the spectrum of sunlight, the material of the product to be tested absorbs heat differently from them, resulting in different temperature rise amplitudes under the same irradiance. Therefore, it is necessary to record the temperature change of the product to be tested over time under different irradiances. For example, the temperature rise of the product to be tested under different irradiances of Yuba light and sunlight is recorded at regular intervals (such as 1 minute) to obtain a complete temperature rise data change curve.

[0076] Linear regression analysis is a statistical method used to determine the linear relationship between two or more variables. In this embodiment, the irradiance of the bathroom heater light and the temperature rise of the product to be tested are taken as one set of variables, and the irradiance of the sunlight and the temperature rise of the product to be tested are taken as another set of variables. By analyzing a large amount of experimental data, a linear equation that can best describe the relationship between the two sets of variables is found. For example, assuming that the irradiance of the bathroom heater light is I1, the corresponding temperature rise of the product to be tested is y1; the irradiance of the sunlight is I2, and the corresponding temperature rise of the product to be tested is y2. Using the linear regression algorithm, equations such as y1=a1I1+b1 and y2=a2I2+b2 can be obtained, which respectively represent the relationship between the irradiance of the bathroom heater light and the temperature rise, and the irradiance of the sunlight and the temperature rise. Among them, a1 and b1 are the proportional coefficients of the linear equation of the irradiance of the bathroom heater light and the temperature rise, and a2 and b2 are the proportional coefficients of the linear equation of the irradiance of the sunlight and the temperature rise.

[0077] As an alternative, a universal irradiance-temperature rise conversion model can be constructed using a blackboard thermometer as the benchmark test element. While this approach can simplify the testing process and reduce modeling costs, it fails to account for the differences in the spectral selective absorption characteristics of different materials. This results in insufficient accuracy in fitting the model to the thermal response of the actual material being tested, and can easily introduce systematic biases in temperature rise tests of different housing materials. Its advantage lies in its ease of implementation, eliminating the need for customized calibration for specific materials. Its limitation lies in its lack of adaptability to spectral absorption characteristics, which can lead to significant deviations between test results and actual thermal effects.

[0078] This example uses an equivalent temperature rise modeling method based on the material properties of the product being tested. By specifically acquiring thermal response data for a specific material under different radiation sources, a material-adaptable irradiance-temperature rise conversion model is constructed. This method accurately maps the equivalent thermal effects of light sources with different spectral characteristics on the same material surface, effectively avoiding the test bias caused by general models that ignore material-specific absorption differences, significantly improving the accuracy of irradiance conversion and the reliability of test results.

[0079] Figure 5 This is a graph showing the relationship between solar irradiance and the temperature rise of the housing of a product to be tested, provided in an embodiment of the present invention. Figure 6 This is a curve diagram of the light irradiance of a bathroom heater and the temperature rise of the shell of the product to be tested provided by an embodiment of the present invention. Figure 7 This is a curve diagram of the conversion between the irradiance of a bathroom heater and the irradiance of sunlight provided by an embodiment of the present invention. Figures 5 to 7 In actual calculations, specific conversion equation coefficients are obtained based on different experimental data and linear regression results. For example, y1 = 0.0389I1 + 7.5793, y2 = 0.024I2 - 3.3696, and y1 = y2. After a series of mathematical operations (transferring terms, simplification, etc.), the conversion equation between I1 and I2 (i.e., the equivalent temperature rise model) can be obtained.

[0080] The conversion equation is:

[0081]

[0082] Among them, I1 represents the irradiance of the bathroom light, and I2 represents the irradiance of the sunlight.

[0083] S205. Based on the equivalent temperature rise model, convert the solar light irradiance into the corresponding bathroom light irradiance of the bathroom light source.

[0084] Specifically, based on the temperature rise equivalent model, the first irradiance is converted into the third irradiance, and the second irradiance is converted into the fourth irradiance; wherein the third irradiance is the irradiance of the bathroom light corresponding to the first irradiance, and the fourth irradiance is the irradiance of the bathroom light corresponding to the second irradiance.

[0085] S206. According to the irradiance of the bathroom heater light, control the bathroom heater light source to irradiate the light-receiving surface of the product to be tested.

[0086] Specifically, the Yuba light with the third irradiance is irradiated onto the top surface of the product to be tested, and the Yuba light with the fourth irradiance is irradiated onto the largest side surface of the product to be tested.

[0087] Figure 8 This is a flow chart of another method for testing temperature rise under solar radiation provided by an embodiment of the present invention. Figure 8 As shown, the solar radiation temperature rise test method includes:

[0088] S301. Determine the area ratios between different light-receiving surfaces of the product to be tested based on geometric features of the product to be tested.

[0089] S302 : Determine, based on the area ratio, the angle of direct sunlight corresponding to when the total irradiation energy received by the product to be tested reaches a maximum value.

[0090] S303: Determine the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight.

[0091] S304. Establish an equivalent temperature rise model of the heater light irradiance and the sunlight irradiance.

[0092] S305. Based on the equivalent temperature rise model, convert the solar light irradiance into the corresponding bathroom light irradiance of the bathroom light source.

[0093] S306. According to the irradiance of the bathroom heater light, adjust the number of bathroom heater light sources, the distance between the bathroom heater light source and the product to be tested, and the installation height of the bathroom heater light source so that the bathroom heater light can evenly illuminate the top surface and the largest side surface of the product to be tested.

[0094] Specifically, the adjustment of the number of Yuba light sources directly affects the irradiance size and uniformity received by the product under test. If the calculated irradiance value is high and a single Yuba light source cannot meet the requirements, it is necessary to increase the number of Yuba light sources. For example, if the irradiance provided by a single Yuba light source at a certain distance and height is 50W / m 2 , and the irradiance required for the top surface of the product to be tested is 92W / m 2 , then at least two bathroom heater light sources may need to work at the same time to ensure that the irradiance received by the top surface meets the requirements.

[0095] Changing the distance between the bathroom heater light source and the product to be tested is an important means of controlling irradiance. According to the propagation characteristics of light, the farther the distance, the lower the irradiance received by the product to be tested; the closer the distance, the higher the irradiance. In actual operation, it is necessary to constantly try different distances and use irradiance measuring instruments (such as radiometers) to monitor the irradiance on the surface of the product to be tested so that it reaches the calculated value. For example, during the test, it was found that when the distance to the product to be tested was 50 cm, the irradiance was 80W / m 2 , did not reach the required 92W / m 2 At this time, the distance can be shortened appropriately and re-measured until the irradiance requirements are met.

[0096] The installation height of the Yuba light source also affects the irradiance and uniformity of the surface of the product under test. The angle and coverage of the light hitting the surface of the product under test will vary depending on the installation height. For example, if the Yuba light source is installed too high, some areas of the product under test may receive insufficient irradiance, while if it is installed too low, some areas of the product under test may receive excessive irradiance. By adjusting the installation height, the Yuba light can be more evenly distributed across the top and largest side surfaces of the product under test.

[0097] When adjusting the Yuba light source, the following uniformity requirements must be met: take points at the edge and center of the product shell to be tested, and the average irradiance of each point shall not be lower than the irradiance of the Yuba light; the minimum irradiance of each point shall not be lower than 80% of the irradiance of the Yuba light. This ensures that all parts of the product to be tested can be tested under conditions close to the actual sunlight irradiation, avoiding deviations in test results due to uneven irradiance. For example, in a certain test, the irradiance at the center of the top surface of the product to be tested is 95W / m 2 The lowest irradiance at the edge is 75W / m 2 The calculated value is 92W / m 2 , due to 75W / m 2 Less than 92W / m 2 80% (i.e. 73.6W / m 2 ), so it is necessary to continue to adjust the number, distance or height of the bathroom heater light source until the uniformity requirements are met.

[0098] Figure 9 This is a flow chart of another method for testing temperature rise under solar radiation provided by an embodiment of the present invention. Figure 9 As shown, the solar radiation temperature rise test method includes:

[0099] S401. Determine the area ratios between different light-receiving surfaces of the product to be tested based on geometric features of the product to be tested.

[0100] S402: Determine, based on the area ratio, the angle of direct sunlight corresponding to when the total irradiation energy received by the product to be tested reaches a maximum value;

[0101] S403: Determine the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight.

[0102] S404. Establish an equivalent temperature rise model between the irradiance of the bathroom heater and the irradiance of the sunlight.

[0103] S405. Based on the equivalent temperature rise model, convert the solar light irradiance into the corresponding bathroom light irradiance of the bathroom light source.

[0104] S406. According to the irradiance of the Yuba light, control the Yuba light source to irradiate the light-receiving surface of the product to be tested.

[0105] S407. Collect temperature data of the product to be tested during the irradiation process in real time through a temperature sensor.

[0106] While the product is being irradiated by a heater or sunlight, the temperature sensor continuously monitors its temperature. It converts temperature changes into electrical or other measurable signals and collects data at set intervals (e.g., every second or every few minutes).

[0107] S408. Analyze and process the temperature data collected by the temperature sensor to generate a temperature rise curve of the product to be tested under the irradiation of the heater light, and evaluate the heat resistance of the product to be tested based on the temperature rise curve.

[0108] The collected temperature data is the basis for establishing various temperature rise models. On the one hand, it is used to establish a model of solar irradiance and temperature rise. By comparing the solar irradiance at different times and the corresponding temperature changes of the product to be tested, the relationship between the two is analyzed, and then a mathematical model is fitted. On the other hand, it provides data support for establishing a model of bathroom heater light irradiance and temperature rise, and clarifies the temperature change pattern of the product to be tested under different bathroom heater irradiances. In addition, based on these real-time collected data, it is also possible to determine whether the temperature of the product to be tested during the irradiation process exceeds the normal working range, thereby evaluating the reliability and stability of the product to be tested in the actual solar radiation environment, and providing a strong basis for the optimal design of the product to be tested.

[0109] Figure 10 This is a flow chart of another method for testing temperature rise under solar radiation provided by an embodiment of the present invention. Figure 10 As shown, the solar radiation temperature rise test method includes:

[0110] S501. Calculate the ratio r of the area of the largest side surface to the area of the top surface based on the geometric structural parameters of the product to be tested using a geometric area calculation method, where r = Sside / Stop, where Sside is the area of the largest side surface of the product to be tested, and Stop is the area of the top surface of the product to be tested.

[0111] S502. According to the area ratio, a numerical optimization method is used to calculate the maximum value of the total irradiation energy under the constraint condition of 0°≤θ≤90°, and the corresponding angle of direct sunlight is output.

[0112] S503: Determine the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight.

[0113] S504. Real-time monitoring of the temperature rise data of the product to be tested due to the irradiance of the heater light and the irradiance of the sunlight on the same material. Based on the linear regression analysis method, a conversion equation between the irradiance of the heater light and the irradiance of the sunlight is fitted.

[0114] S505. Based on the equivalent temperature rise model, convert the solar light irradiance into the corresponding bathroom light irradiance of the bathroom light source.

[0115] S506. According to the irradiance of the Yuba light, control the Yuba light source to irradiate the light-receiving surface of the product to be tested.

[0116] S507 , collecting temperature data of the product to be tested during the irradiation process in real time through a temperature sensor.

[0117] S508. Analyze and process the temperature data collected by the temperature sensor to generate a temperature rise curve of the product to be tested under the irradiation of the bathroom heater light, and evaluate the heat resistance of the product to be tested based on the temperature rise curve.

[0118] The embodiment of the present invention decouples the incident direction of solar radiation into two-dimensional radiation components of the top surface and the maximum side surface by constructing a correlation model between the geometric configuration of the product and radiation absorption, thereby realizing accurate calculation of the radiation energy distribution under different surface area ratios. At the same time, a quantitative model of irradiance absorption based on the installation posture angle is established, which effectively considers the influence of the actual installation angle of the product to be tested on the efficiency of receiving solar energy. In addition, a temperature rise equivalent model of the irradiance of the bathroom heater light and the solar irradiance is constructed to solve the problem of temperature rise simulation deviation caused by the difference in the spectra of different light sources. In addition, an innovative low-cost alternative to the bathroom heater light source is proposed, which significantly reduces the equipment cost and implementation threshold of the solar radiation simulation test while maintaining the effectiveness of the test.

[0119] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A solar radiation temperature rise test method, characterized in that: include: Determining the area ratios between different light-receiving surfaces of the product to be tested based on the geometric characteristics of the product to be tested; Determining, based on the area ratio, the angle of direct sunlight corresponding to when the total irradiation energy received by the product to be tested reaches a maximum value; Determining the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight; Establish an equivalent temperature rise model between the Yuba light irradiance and the solar light irradiance; Based on the equivalent temperature rise model, the sunlight irradiance is converted into the irradiance of the corresponding bathroom light source; According to the irradiance of the bathroom heater light, the bathroom heater light source is controlled to irradiate the light-receiving surface of the product to be tested.

2. The solar radiation temperature rise test method according to claim 1, characterized in that: The light-receiving surface includes a maximum side surface and a top surface; The step of determining the area ratio between different light-receiving surfaces of the product to be tested based on the geometric characteristics of the product to be tested includes: According to the geometric structural parameters of the product to be tested, the geometric area calculation method is used to calculate the area ratio r of the maximum side surface to the top surface, where r = S side / S top, S side is the area of the maximum side surface of the product to be tested, and S top is the area of the top surface of the product to be tested.

3. The solar radiation temperature rise testing method according to claim 1, characterized in that: The step of determining, based on the area ratio, the angle of direct sunlight corresponding to when the total radiation energy received by the product to be tested reaches a maximum value comprises: According to the area ratio, a numerical optimization method is used to calculate the maximum value of the total irradiation energy under the constraint condition of 0°≤θ≤90°, and the corresponding angle of direct sunlight is output; The total irradiation energy Qt(θ)=Id(θ)+r×Ic(θ); Wherein, θ represents the angle of direct sunlight, Id represents the irradiance of sunlight on the top surface of the product to be tested, Ic represents the irradiance of sunlight on the largest side surface of the product to be tested, and r represents the area ratio of the largest side surface to the top surface.

4. The solar radiation temperature rise test method according to claim 1, characterized in that: The light-receiving surface includes a maximum side surface and a top surface; The step of determining the solar irradiance of different light-receiving surfaces of the product to be tested according to the angle of direct sunlight comprises: Solar irradiance on the top surface of the product to be tested The solar irradiance on the largest side of the product to be tested Where I represents the maximum ground irradiance, which is generally 1090w / m 2 ; θ represents the angle of direct sunlight, and α is the inclination angle of the product to be tested relative to the vertical plane when it is installed.

5. The solar radiation temperature rise testing method according to claim 1, characterized in that: The step of establishing an equivalent temperature rise model of the Yuba light irradiance and the sunlight irradiance includes: The temperature rise data of the product to be tested made of the same material as the heater light irradiance and the sunlight irradiance are monitored in real time, and a conversion equation between the heater light irradiance and the sunlight irradiance is fitted based on a linear regression analysis method.

6. The solar radiation temperature rise testing method according to claim 5, characterized in that: The conversion equation is: Among them, I1 represents the irradiance of the bathroom light, and I2 represents the irradiance of the sunlight.

7. The solar radiation temperature rise testing method according to claim 1, characterized in that: According to the irradiance of the Yuba light, the steps of controlling the Yuba light source to irradiate the light-receiving surface of the product to be tested and completing the temperature rise test include: According to the irradiance of the bathroom heater light, adjust the number of the bathroom heater light sources, the distance between the bathroom heater light source and the product to be tested, and the installation height of the bathroom heater light source so that the bathroom heater light can evenly illuminate the top surface and the largest side surface of the product to be tested.

8. The solar radiation temperature rise testing method according to claim 7, characterized in that: When adjusting the Yuba light source, the following uniformity requirements must be met: Take points at the edge and center of the shell of the product to be tested, and the average irradiance of each point is not less than the irradiance of the bathroom light; The lowest value of irradiance at each point is not less than 80% of the irradiance of the bathroom heater light.

9. The solar radiation temperature rise testing method according to claim 1, characterized in that: After the step of controlling the Yuba light source to irradiate the light-receiving surface of the product to be tested according to the irradiance of the Yuba light, the solar radiation temperature rise test method further includes: The temperature data of the product to be tested during the irradiation process is collected in real time by a temperature sensor.

10. The solar radiation temperature rise testing method according to claim 9, characterized in that: After the step of collecting temperature data of the product to be tested during the irradiation process in real time using a temperature sensor, the solar radiation temperature rise test method further includes: The temperature data collected by the temperature sensor is analyzed and processed to generate a temperature rise curve of the product to be tested under the irradiation of the bathroom heater light, and the heat resistance of the product to be tested is evaluated based on the temperature rise curve.

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