Radiation refrigeration power testing device and testing method

Abstract

The invention belongs to the technical field of radiation refrigeration, and provides a radiation refrigeration power testing device and method, and the device comprises a testing device main body which comprises a case, and a water-cooling reverse synchronous verification module, a heating constant-temperature power testing module and a synchronous parallel comparison testing module which are disposed in the case; the small meteorological station is independently arranged around the testing device main body, comprises a temperature sensor, a humidity sensor, a wind speed sensor, an atmospheric pressure sensor, a solar irradiance sensor and a wireless transmission module, and is used for monitoring and transmitting environmental parameters in real time; and the monitoring terminal is used for receiving and storing the environment parameters and the test data sent by the wireless transmission module. Compared with the prior art, the water-cooling reverse synchronous verification module and the heating constant-temperature power test module are introduced, so that the accuracy of a test result can be verified in real time, active correction is performed through comparison with a theoretical value, and the accuracy of the test result is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiative cooling, and particularly relates to a radiative cooling power testing device and a testing method. Background Art

[0002] In recent years, the annual growth of greenhouse gas emissions has led to increasingly serious environmental deterioration phenomena such as global warming and the urban heat island effect. If this phenomenon is not alleviated in time, hundreds of millions of people will lose their livelihoods, families, and properties. Active cooling systems (such as air conditioners) account for approximately 10% of global greenhouse gas emissions, and it is expected that their emissions will triple by 2050. With the miniaturization of equipment and semiconductor devices and the increase in power, the demand for cooling has further increased, expanding greenhouse gas emissions. In this context, it is urgent to achieve the same cooling effect with the lowest energy consumption.

[0003] As a passive cooling technology, radiative cooling realizes zero energy consumption and zero emissions during the cooling process, highlighting its great value. Since the atmosphere has a very high transmittance in the 8 - 13μm band, passive radiative cooling technology utilizes the high transmittance characteristic of this "atmospheric window" to emit heat through this window into outer space, thereby achieving the purpose of cooling. This technology does not require the addition of refrigerants and does not require external energy input, truly realizing zero pollution and zero emissions. It is one of the most promising cooling methods to reduce greenhouse gas emissions and slow down global warming.

[0004] With its advantages, radiative cooling technology has gradually been applied to people's daily lives. Currently, the radiative cooling products on the market are mainly divided into the following three categories: fabrics, films, and coatings. However, there is currently a lack of a national standard monitoring system for passive radiative cooling power testing. Therefore, it is urgent to develop a standard testing device to intuitively reflect the cooling performance of radiative cooling materials and highlight their superiority compared to conventional thermal insulation materials. Summary of the Invention

[0005] Aiming at the problems existing in the above - mentioned background art, the present invention provides a radiative cooling power testing device and a testing method. This method excludes the influence of environmental factors on the cooling effect, can intuitively reflect the performance of the cooling material, and at the same time sets a control group to highlight the superiority of radiative cooling technology through cooling technology.

[0006] The technical solution adopted by the present invention to solve the above - mentioned technical problems is to propose a radiative cooling power testing device, including: a main body of the testing device, which includes a chassis, aerogel filled inside the chassis, a radiative cooling film attached to the outer surface of the chassis, a water - cooled reverse synchronous verification module, a heating constant - temperature power testing module, and a synchronous parallel comparison testing module. The main bodies of the water - cooled reverse synchronous verification module, the heating constant - temperature power testing module, and the synchronous parallel comparison testing module are all located inside the chassis;

[0007] A small weather station is independently set around the main body of the test device. It includes a temperature sensor, a humidity sensor, a wind speed sensor, an atmospheric pressure sensor, a solar irradiance sensor and a wireless transmission module, and is used to monitor and transmit environmental parameters in real time;

[0008] A monitoring terminal is used to receive and store the environmental parameters and test data sent by the wireless transmission module;

[0009] Inside the water-cooled reverse synchronization verification module, there is a water storage brass box and a temperature sensor, which are used to calculate the refrigeration power P through the change of water temperature cool The heating constant temperature power test module is built-in with a thermocouple and a heating device. By adjusting the heating power, the material temperature is made consistent with the environmental temperature, and the refrigeration power P is calculated based on the heating power rad and is compared with the theoretical value P 理论 in real time. The synchronous parallel comparison test module is used to place the comparison material and runs synchronously with the heating constant temperature module to verify the refrigeration performance.

[0010] In the above-mentioned radiation refrigeration power test device, the chassis is an all-aluminum chassis, and the chassis is manufactured by an integrated molding process. The internal cavity is completely filled with aerogel, and a radiation refrigeration film with a thickness of 0.1 - 0.3 mm is attached to the outer surface;

[0011] The test surfaces of the water-cooled reverse synchronization verification module, the heating constant temperature power test module and the synchronous parallel comparison test module are all made of brass, the thickness of the copper sheet is 0.2 - 0.5 mm, and the copper sheet sizes of each module are kept consistent.

[0012] In the above-mentioned radiation refrigeration power test device, a plurality of thermocouples are evenly distributed at the bottom of the copper sheet of the heating constant temperature power test module, and the heat conduction between the thermocouple and the heating device and the copper sheet is isolated by aerogel;

[0013] The periphery and bottom of the brass box of the water-cooled reverse synchronization verification module are wrapped with an aerogel heat insulation layer, the box is filled with water, and the refrigeration power is calculated by measuring the change of water temperature.

[0014] In the above-mentioned radiation refrigeration power test device, there is no heating or cooling device inside the synchronous parallel comparison test module. The surface of its copper sheet is coated with a common comparison material, and the temperature data is synchronously monitored with the copper sheet coated with the radiation refrigeration material of the heating constant temperature power test module to generate a comparative analysis result.

[0015] In the above-mentioned radiation refrigeration power test device, the top of the main body of the test device is provided with a detachable cover plate. A window matching the test surface is opened in the middle of the cover plate. Aluminum foil is attached within 5 cm around the window, and a radiation refrigeration film is attached to the rest;

[0016] A polyethylene film is covered above the window, with a light transmittance greater than or equal to 95% and a thickness of 0.02 - 0.3 mm.

[0017] In the above-mentioned radiation cooling power test device, the cooling power P rad is calculated by the following formula:

[0018]

[0019] where λ is the thermal conductivity of the material, Cv is the volume heat capacity, and ΔT is the temperature difference between the material surface and the environment.

[0020] In the above-mentioned radiation cooling power test device, the theoretical value P 理论 is calculated by the following formula:

[0021] P 理论 = εσT 4 - αI

[0022] where ε is the infrared emissivity of the coating, σ is the Stefan - Boltzmann constant, T is the coating surface temperature, α is the solar reflectance of the coating, and I is the solar radiation intensity;

[0023] When the measured cooling power P rad or P cool deviates from the theoretical value by more than the threshold, the heating power or water cooling parameters are automatically adjusted to reduce the error.

[0024] The present invention also proposes a radiation cooling power test method based on the above device to solve the above technical problems, including the steps:

[0025] S1. Coating the radiation cooling material and the comparison material on the copper sheet surfaces of the heating and constant temperature module, the water cooling module, and the synchronous comparison module respectively, sealing the cover plate and starting the small weather station;

[0026] S2. Maintaining the material temperature consistent with the ambient temperature through the heating and constant temperature module, and recording the heating power P hot in real time, and calculating the corrected cooling power P rad ;

[0027] S3. Synchronously measuring the water temperature change and mass of the water cooling module, and calculating the water cooling power P cool by the following formula:

[0028]

[0029] where ΔT is the water temperature change in the copper box, ρ is the density of water, S is the test bench area, K is the thermal conductivity of copper, A is the area of the upper surface copper plate, and ΔT1 is the temperature difference between the sample surface and the back surface of the upper surface copper plate during the test;

[0030] S4. Compare with P rad With P cool Verify the accuracy of the test results by the numerical difference of

[0031] In the above method for testing the radiative cooling power, the corrected cooling power P rad Is further compared with the theoretical value P 理论 If the deviation exceeds 5%, the heating power of the thermocouple heating device or the water-cooling flow rate is automatically adjusted to optimize the test parameters.

[0032] In the above method for testing the radiative cooling power, a cooling power-time curve and a temperature-time curve are continuously generated during the test process and are displayed in real time through a monitoring terminal. The curve data is stored in a cloud server through a wireless transmission module.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. By introducing a water-cooling reverse synchronization verification module and a heating constant-temperature power test module, the accuracy of the test results can be verified in real time, and active correction can be performed by comparing with the theoretical value to ensure the accuracy of the test results.

[0035] 2. By considering the influence of thickness on the cooling power through volume heat capacity and correction coefficient, the test value is more accurately fitted to the theoretical calculation value.

[0036] 3. The heating constant-temperature power test module is added. By measuring the temperature difference between the inlet and outlet water and the mass of the collected water, it can accurately calculate how much additional energy is required for general materials to reach the same temperature. On the one hand, it can perform real-time two-way verification of the cooling capacity, eliminate errors, and more intuitively reflect the advantages of radiative cooling materials in energy conservation and emission reduction, greatly improving the effectiveness and credibility of the verification results.

[0037] 4. The integrated forged chassis eliminates the "thermal bridge" effect. All the vacant positions inside the device are filled with low-thermal-conductivity aerogel, and the outer shell is coated with a radiative cooling film to ensure that the temperature inside the device remains unchanged under the influence of external conditions during long-term outdoor operation. The accuracy of the continuous and smooth cooling power-time curve is greatly improved. Brief Description of the Drawings

[0038] Figure 1 Is a perspective view of a radiative cooling power test device of the present invention;

[0039] Figure 2 Is Figure 1 A detailed view of a part of the structure in

[0040] Figure 3 Is a structural schematic diagram of a radiative cooling power test device of the present invention;

[0041] Figure 4 They are the refrigeration power-time curves of two test modes obtained after coefficient correction in the test of the present invention.

[0042] In the figure, 100 is the chassis; 110 is the upper cover; 120 is the copper box; 200 is the aerogel; 300 is the heating and constant temperature test module; 310 is the heating device; 320 is the thermocouple; 330 is the heat insulation material; 400 is the synchronous parallel comparison test module; 500 is the water-cooled reverse synchronous verification module. Detailed implementation manners

[0043] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0045] As Figures 1 to 4 shown, a radiation refrigeration power test device of the present invention includes: a test device main body, a small weather station, and a monitoring terminal.

[0046] Specifically, the test device main body includes a chassis 100, an aerogel 200 filled inside the chassis 100, a radiation refrigeration film attached to the outer surface of the chassis 100, a water-cooled reverse synchronous verification module 500, a heating and constant temperature power test module, and a synchronous parallel comparison test module 400. The main bodies of the water-cooled reverse synchronous verification module 500, the heating and constant temperature power test module, and the synchronous parallel comparison test module 400 are all located inside the chassis 100.

[0047] The small weather station is independently arranged around the test device main body and includes a temperature sensor, a humidity sensor, a wind speed sensor, an atmospheric pressure sensor, a solar irradiance sensor, and a wireless transmission module. The network sensor is linked to the power supply point, and the power supply powers the small weather station and the network sensor. The data is linked to the monitoring terminal through the network sensor for data transmission, and is used to monitor and transmit environmental parameters in real time.

[0048] The monitoring terminal is used to receive and store the environmental parameters and test data sent by the wireless transmission module. The monitoring terminal includes a display module and a storage module, which are used for data display and data storage.

[0049] The water-cooled reverse synchronous verification module 500 is internally provided with a water storage brass box 120 and a temperature sensor, and is used to calculate the refrigeration power P through the change of water temperature cool, the heating constant-temperature power test module is built with a thermocouple 320 and a heating device 310. By adjusting the heating power, the temperature of the material is made consistent with the ambient temperature, and the refrigeration power P is calculated based on the heating power. rad , and compared with the theoretical value P 理论 in real time. The synchronous parallel comparison test module 400 is used to place the comparison material and runs synchronously with the heating constant-temperature module to verify the refrigeration performance.

[0050] This solution is equipped with a water-cooled reverse synchronous verification module 500, a heating constant-temperature power test module, and a synchronous parallel comparison test module 400. The heating constant-temperature power test module controls the temperature of the heating table through the change of the ambient temperature to keep the material temperature consistent with the ambient temperature. Among them, the heating power of the thermocouple 320 and the heating device 310 inside the heating table is used to calculate the refrigeration power. The water-cooled reverse synchronous verification module 500 accurately calculates the required refrigeration power of the control sample by measuring the temperature difference and mass of the inlet and outlet water, and synchronously verifies in real time whether the test results of the radiative cooling material under the other two modules are accurate and the energy-saving advantages. This solution can continuously monitor the refrigeration power and maximum temperature drop of the radiative cooling material throughout the day, and can obtain continuous and smooth refrigeration power-time and temperature-time curves, and can monitor the accuracy and credibility of the comparison test results in real time.

[0051] Moreover, by introducing the water-cooled reverse synchronous verification module 500 and the heating constant-temperature power test module, this solution can verify the accuracy of the test results in real time.

[0052] During the actual test process, the actual refrigeration powers P cool and P rad are measured respectively by the water-cooled reverse synchronous verification module 500 and the heating constant-temperature power test module, and compared with the theoretical value P 理论 . If there is a deviation between the actual value and the theoretical value, the system will automatically adjust the test parameters (such as heating power, water-cooled flow rate, etc.) to make the actual value approach the theoretical value to ensure the accuracy of the test results.

[0053] In this solution, the chassis 100 is an all-aluminum chassis 100, and the chassis 100 is manufactured by an integrated molding process. The internal cavity is completely filled with aerogel 200, and a radiative cooling film with a thickness of 0.1 - 0.3 mm is attached to the outer surface; the test surfaces of the water-cooled reverse synchronous verification module 500, the heating constant-temperature power test module, and the synchronous parallel comparison test module 400 are all made of brass, the thickness of the copper sheet is 0.2 - 0.5 mm, and the copper sheet sizes of each module are kept consistent.

[0054] The all-aluminum chassis 100 consists of two parts: the upper cavity housing and the lower electronic control center. The upper cavity housing is further divided into an inner and outer layer, with the center filled with aerogel 200 test bench. After installation, the remaining cavity is completely filled with aerogel 200. Manufactured using a one-piece molding process, the all-aluminum chassis 100 eliminates thermal bridges during experiments. Its interior is filled with aerogel 200 to prevent heat diffusion and affect the accuracy of test results. A silver radiant cooling film is applied to the exterior of the chassis 100 to mitigate the effects of solar radiation during extended outdoor operation.

[0055] Preferably, a copper box 120 is provided below the water-cooled reverse synchronization verification module 500, the heated constant temperature power test module, and the synchronous parallel comparison test module 400. The dimensions of the copper box 120 are all maintained at 10cm*10cm*5cm, and the thickness of the copper plate used is 0.2-0.5cm. Since the thin copper plate has poor mechanical properties, a partition is required to connect the upper and lower surfaces to compensate for this defect. The number of partitions is 8, and each partition is 1cm apart, with a size of 7cm*7cm*1cm.

[0056] During the test, the main bodies of the water-cooled reverse synchronization verification module 500, the heating constant temperature power test module and the synchronous parallel comparison test module 400 are all located inside the chassis 100, and are equipped with temperature sensors. The test surface is made of copper and is flush with the top surface of the outer shell. The outer surface of the copper material is coated with the materials to be tested and compared, and the top is covered with polyethylene film to isolate the air and reduce convection; the heating constant temperature power test module is equipped with a thermocouple 320, a heating device 310, and a temperature sensor.

[0057] In order to detect the real-time temperature of the heating constant temperature power test module and ensure the accuracy of the real-time temperature of the heating constant temperature power test module, in this solution, multiple temperature sensors are evenly distributed on the bottom of the copper sheet of the heating constant temperature power test module. The temperature sensor is a thermocouple 320 with an accuracy of 0.01°C and is located at the center and four corners of the back of the sample table. The thermocouples 320 on the four corners are 2 cm away from the edge of the sample, and the thermocouples 320 and the copper sheet are isolated from heat conduction by aerogel 200.

[0058] In addition, the brass box 120 of the water-cooled reverse synchronous verification module 500 is wrapped with an aerogel 200 insulation layer on all sides and the bottom. The box is filled with water and the cooling power is calculated by measuring the change in water temperature.

[0059] A water-storing copper box 120 is provided inside the water-cooled reverse synchronous verification module 500. A water inlet is provided on the top of the box to facilitate the injection of liquid. The temperature before the test and at each test time point is used to accurately calculate the cooling power and compare it with the heating constant temperature power test module value to verify and determine the accuracy of the test.

[0060] Preferably, the thermocouple 320 of the water-cooled reverse synchronization verification module 500 is located 1 mm below the coating, and there are five in total, which are respectively located at the four corners and the middle position of the coating. The voltage sampling accuracy is TYP, ±0.03 V at 5 V and ±0.05 V at 25 V. The current sampling accuracy is TYP, ±0.3 A at 5 A and ±0.5 A at 10 A

[0061] There is no heating or cooling device inside the synchronous parallel comparison test module 400. The surface of its copper sheet is coated with ordinary comparison materials, and the temperature data is synchronously monitored with the copper sheet coated with radiation cooling materials of the heating constant temperature power test module to generate a comparative analysis result.

[0062] In this solution, the difference between the synchronous parallel comparison test module 400 and the heating constant temperature power test module is that the former only has a temperature sensor inside and no heating or cooling devices. When evaluating the radiation cooling performance of a certain material, a common similar ordinary material is used as a comparison, and one of each is placed. Enabling the two modules simultaneously can visually evaluate and compare the radiation cooling performance and cooling power of the radiation cooling materials.

[0063] In this solution, the top of the test device main body is provided with a detachable cover plate. A window matching the test surface is opened in the middle of the cover plate. Aluminum foil is pasted within 5 cm around the window, and radiation cooling film is pasted on the rest; a polyethylene film is covered above the window, and its light transmittance is greater than or equal to 95%, and the thickness is 0.02 - 0.3 mm.

[0064] The cover plate is of a three-layer structure, which is sequentially from top to bottom a radiation cooling film, plexiglass, and a double-layer full-aluminum plate with aerogel 200 filled in the middle. The middle of the cover plate is hollowed out to form a window. The window size is 10 cm larger than the test bench size, and the position less than 10 cm is inclined at 45 degrees and pasted with aluminum film to ensure that the radiation cooling film does not affect the test result. Radiation cooling film is pasted at other positions to maximize the elimination of the influence of surrounding environmental changes on the cooling power test.

[0065] In this solution, the cooling power P rad is calculated by the following formula:

[0066]

[0067] where T is the time of temperature fluctuation, usually T = 24 h, λ is the thermal conductivity of the material, Cv is the volume heat capacity, and ΔT is the temperature difference between the material surface and the environment.

[0068] The theoretical value P 理论 is calculated by the following formula:

[0069] P 理论 = εσT 4 - αI

[0070] Among them, ε is the infrared emissivity of the coating, σ is the Stefan-Boltzmann constant, T is the surface temperature of the coating, α is the solar reflectance of the coating, and I is the solar radiation intensity;

[0071] When the measured refrigeration power P rad or P cool deviates from the theoretical value by more than the threshold, the heating power or water-cooling parameters are automatically adjusted to reduce the error.

[0072] This solution also includes a radiation refrigeration test method implemented based on the above radiation refrigeration power test device, including the following steps:

[0073] S1. Coat the radiation refrigeration material and the comparison material on the copper sheet surfaces of the heating and constant temperature module, the water-cooling module, and the synchronous comparison module respectively, seal the cover plate, and start the small weather station;

[0074] S2. Keep the material temperature consistent with the ambient temperature through the heating and constant temperature module, and record the heating power P hot , and calculate the corrected refrigeration power P rad ;

[0075] S3. Synchronously measure the water temperature change and mass of the water-cooling module, and calculate the water-cooling refrigeration power P cool through the following formula:

[0076]

[0077] Among them, ΔT is the water temperature change in the copper box 120, ρ is the density of water, S is the test bench area, K is the thermal conductivity of copper, A is the area of the upper surface copper plate, and ΔT1 is the temperature difference between the sample surface and the back of the upper surface copper plate during the test;

[0078] S4. Compare the numerical differences between P rad and P cool to verify the accuracy of the test results.

[0079] The corrected refrigeration power P rad is further compared with the theoretical value P 理论 . If the deviation exceeds 5%, the heating power of the thermocouple 320 heating device 310 or the water-cooling flow rate is automatically adjusted to optimize the test parameters.

[0080] During the test, a refrigeration power-time curve and a temperature-time curve are continuously generated and displayed in real time through the monitoring terminal. The curve data is stored in the cloud server through the wireless transmission module.

[0081] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. Terms such as "connected" and "fixed" should be understood in a broad sense. For example, "fixed" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0083] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A radiation cooling power test device, characterized in that Including: The main body of the test device, which includes a chassis, aerogel filled inside the chassis, a radiative cooling film attached to the outer surface of the chassis, a water-cooled reverse synchronization verification module, a heating constant-temperature power test module, and a synchronous parallel comparison test module. The main bodies of the water-cooled reverse synchronization verification module, the heating constant-temperature power test module, and the synchronous parallel comparison test module are all located inside the chassis; A small weather station, independently set around the main body of the test device, including a temperature sensor, a humidity sensor, a wind speed sensor, an atmospheric pressure sensor, a solar irradiance sensor, and a wireless transmission module, for real-time monitoring and transmitting environmental parameters; A monitoring terminal, for receiving and storing the environmental parameters and test data sent by the wireless transmission module; The water-cooled reverse synchronization verification module is internally provided with a water storage brass box and a temperature sensor, which are used to calculate the refrigeration power P through the change of water temperature cool The heating constant temperature power test module is internally provided with a thermocouple and a heating device. By adjusting the heating power, the material temperature is made consistent with the ambient temperature, and the refrigeration power P is calculated based on the heating power rad , and it is compared with the theoretical value P 理论 in real time. The synchronous parallel comparison test module is used to place the comparison material and operate synchronously with the heating constant temperature module to verify the refrigeration performance.

2. The radiation cooling power test device according to claim 1, wherein The chassis is an all-aluminum chassis, and the chassis is manufactured by an integrated molding process. The internal cavity is completely filled with aerogel, and a radiative cooling film with a thickness of 0.1 - 0.3 mm is attached to the outer surface; The test surfaces of the water-cooled reverse synchronization verification module, the heating constant-temperature power test module, and the synchronous parallel comparison test module are all made of brass, the thickness of the copper sheet is 0.2 - 0.5 mm, and the copper sheet sizes of each module are kept consistent.

3. The radiation cooling power test device according to claim 2, wherein A plurality of thermocouples are evenly distributed at the bottom of the copper sheet of the heating constant-temperature power test module, and the heat conduction between the thermocouples and the heating device and the copper sheet is isolated by aerogel; The brass box of the water-cooled reverse synchronization verification module is wrapped with an aerogel heat insulation layer around the perimeter and at the bottom, the box is filled with water, and the cooling power is calculated by measuring the change in water temperature.

4. The radiation cooling power test device according to claim 1, wherein There is no heating or cooling device inside the synchronous parallel comparison test module. The surface of its copper sheet is coated with a common comparison material, and the temperature data is synchronously monitored with the copper sheet coated with a radiative cooling material of the heating constant-temperature power test module to generate a comparative analysis result.

5. The radiation cooling power test device according to claim 1, characterized in that, A detachable cover plate is provided at the top of the main body of the test device. A window matching the test surface is opened in the middle of the cover plate. Aluminum foil is attached within 5 cm around the window, and a radiative cooling film is attached to the rest of the part; A polyethylene film is covered above the window, its light transmittance is greater than or equal to 95%, and its thickness is 0.02 - 0.3 mm.

6. The radiation cooling power test device according to claim 1, wherein, The refrigeration power P rad is calculated by the following formula: Wherein, T is the time of temperature fluctuation, usually T = 24 h, λ is the thermal conductivity of the material, Cv is the volume heat capacity, and ΔT is the temperature difference between the material surface and the environment.

7. The radiation cooling power test device according to claim 6, wherein The theoretical value P 理论 is calculated by the following formula: P 理论 = εσT 4 - αI Wherein, ε is the infrared emissivity of the coating, σ is the Stefan-Boltzmann constant, T is the surface temperature of the coating, α is the solar reflectance of the coating, and I is the solar radiation intensity; When the measured refrigeration power P rad or P cool has a deviation from the theoretical value exceeding the threshold, the heating power or water-cooling parameters are automatically adjusted to reduce the error.

8. A method for testing the radiation cooling power, which is implemented based on the device described in any one of claims 1-7, is characterized in that, Including the following steps: S1. Coat the radiative cooling material and the comparison material on the surfaces of the copper sheets of the heating constant-temperature module, the water-cooled module, and the synchronous comparison module respectively, seal the cover plate and start the small weather station; S2. Maintain the material temperature consistent with the ambient temperature through the heating and constant temperature module, and record the heating power P in real time hot , and calculate the corrected cooling power P rad ; S3. Synchronously measure the water temperature change and mass of the water-cooled module, and calculate the water-cooled refrigeration power P through the following formula cool :[[]]END]] Wherein, ΔT is the change in the temperature of the water in the copper box, ρ is the density of water, S is the area of the test bench, K is the thermal conductivity of copper, A is the area of the upper surface copper plate, and ΔT1 is the temperature difference between the sample surface and the back surface of the upper surface copper plate during the test; S4. Compare with P rad With P cool Verify the accuracy of the test results by the numerical difference 9. The test method according to claim 8, wherein: The corrected refrigeration power P rad is further compared with the theoretical value P 理论 If the deviation exceeds 5%, the heating power of the thermocouple heating device or the water cooling flow rate is automatically adjusted to optimize the test parameters.

10. The test method according to claim 8, wherein: During the test, a cooling power - time curve and a temperature - time curve are continuously generated and are displayed in real time through the monitoring terminal. The curve data is stored in the cloud server through the wireless transmission module.

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