Light-transmitting roof light-heat performance detection device and detection method thereof under various weather conditions

Abstract

The present application belongs to the technical field of building envelope light-thermal performance detection, and specifically relates to a light-thermal performance detection device for light-transmitting roof under various meteorological conditions and a detection method thereof. The light-thermal performance detection device for light-transmitting roof under various meteorological conditions comprises a heat metering device, a supply-return air system, a supply-return water system, a control system, an external environment simulation device, an external environment box and an artificial light source. A light-transmitting roof test piece is installed at the lower side wall of the external environment box. The external environment simulation device and a spraying device are used to simulate the environmental conditions under different steady-state meteorological conditions and dynamic meteorological conditions in the spraying condition. The spraying device comprises a nozzle. First light source radiation intensity sensors, second light source radiation intensity sensors and first illuminance sensors are further arranged in the external environment box. The present application can accurately evaluate the light-thermal performance of the light-transmitting roof under the spraying condition.

Description

[0001] This application is a divisional application of the invention patent application filed on January 23, 2025, entitled "A device for testing the photothermal performance of a spray-type translucent roof and a testing method thereof", with application number 2025101082666. Technical Field

[0002] This invention belongs to the field of building envelope photothermal performance testing technology, specifically a device and method for testing the photothermal performance of translucent roofs under various meteorological conditions. Background Technology

[0003] Translucent roofs are a type of building roof designed primarily for natural lighting. Due to their advantages such as unobstructed views, good visual effects, and light load, they are widely used in large public buildings such as airports and commercial complexes.

[0004] While translucent roofs can effectively improve the indoor natural lighting environment and reduce building lighting energy consumption, their unique thermal properties can have a significant negative impact on the indoor thermal environment. To improve the indoor thermal environment and reduce air conditioning energy consumption, mist-type translucent roofs with auxiliary misting systems have emerged, achieving a "win-win-win" situation of roof cooling, shading, and lighting. Although there are currently methods for measuring the solar heat gain coefficient (SHGC) of translucent building envelopes, these methods and devices are not suitable for evaluating the photothermal performance of translucent roofs under misting conditions. Summary of the Invention

[0005] In view of this, the present invention provides a device for testing the photothermal performance of a light-transmitting roof under various meteorological conditions, comprising:

[0006] An external environment simulation device includes an external environment chamber and an artificial light source, wherein the artificial light source is installed inside the external environment chamber. The external environment simulation device and the spraying device are used to simulate environmental conditions under different steady-state meteorological conditions and dynamic meteorological conditions under spraying conditions.

[0007] A translucent indoor test specimen is installed on the lower side wall of the external environment box, and the translucent indoor test specimen is located below the artificial light source;

[0008] A spraying device includes a nozzle located below an artificial light source and above the translucent test specimen. The external environment chamber is also equipped with a first light source radiation intensity sensor, a second light source radiation intensity sensor, and a first illuminance sensor, wherein the first light source radiation intensity sensor is located below the artificial light source and above the nozzle, and the second light source radiation intensity sensor and the first illuminance sensor are located below the nozzle and above the translucent test specimen.

[0009] The heat metering device includes a heat metering box, a third light source radiation intensity sensor, and a second illuminance sensor, wherein the heat metering box is located below the light-transmitting roof test specimen;

[0010] A supply and return air system is used to circulate airflow into the heat metering device, and the supply and return air system is connected to the heat metering device.

[0011] A water supply and return system is used to supply water to the air supply and return system, and the water supply and return system is connected to the air supply and return system.

[0012] A control system is used to control an external environment simulation device, a heat metering device, a supply and return air system, a supply and return water system, and a spray device. The control system is electrically connected to the external environment simulation device, the heat metering device, the supply and return air system, the supply and return water system, and the spray device.

[0013] Secondly, the present invention provides a method for detecting the photothermal performance of a translucent roof under various meteorological conditions, using the photothermal performance detection device for translucent roofs under various meteorological conditions described in the first aspect, the method comprising:

[0014] Obtain the preset experimental requirements;

[0015] Determine the control parameters of the artificial light source according to the preset experimental requirements;

[0016] The artificial light source is controlled to operate according to the aforementioned artificial light source control parameters;

[0017] Control the water supply and return system to circulate water to the air supply and return system, control the air supply and return system to circulate air to the heat metering box, and control the spray device to spray above the test specimen in the light-transmitting roof.

[0018] The average radiant intensity and average illuminance received on the outer surface of the light-transmitting roof specimen under spray conditions were obtained, along with the thermal parameters of the supply and return air system, supply and return water system, heat metering box, specimen frame, and light-transmitting roof specimen.

[0019] The photothermal performance of the spray-type translucent roof is calculated based on the average radiation intensity of the outer surface of the translucent roof test specimen, the average illuminance received by the outer surface of the translucent roof test specimen, and the aforementioned thermal parameters.

[0020] Beneficial Effects: The multi-sensor detection device and method for the photothermal performance of translucent roofs of the present invention can accurately simulate environmental conditions under different boundary conditions, as well as different steady-state and dynamic meteorological conditions, through an external environment simulation device and a spray device. Furthermore, the photothermal performance of the spray-type translucent roof under these conditions is accurately detected by a heat metering device. This allows for accurate measurement of the solar radiation intensity received by the surface of the translucent building envelope under spray conditions, and also enables monitoring and evaluation of the photothermal performance of the spray-type translucent roof under different boundary conditions. The present invention further improves detection accuracy by using a water supply and return system and a wind supply and return system to rapidly stabilize the temperature in the heat metering box within a preset range. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0022] Figure 1 This is a front view of the spray-type translucent roof photothermal performance testing device of the present invention;

[0023] Figure 2 This is a top view of the spray-type translucent roof photothermal performance testing device of the present invention;

[0024] Figure 3 This is a schematic flowchart of the photothermal performance testing method for a spray-type translucent roof according to the present invention;

[0025] Figure 4 A flowchart illustrating the method for determining artificial light source control parameters according to experimental requirements in this invention;

[0026] Figure 5 The fitting curve of the average radiation intensity of the outer surface of the light-emitting test specimen of the present invention and the output radiation intensity of the artificial light source;

[0027] Figure 6 This is a graph showing the relationship between the hourly solar radiation intensity value and the corresponding hourly artificial light source setting value of the present invention;

[0028] Figure 7 This is a flowchart illustrating the method for obtaining various detection parameters in this invention;

[0029] Figure 8 This is a flowchart illustrating the method for calculating the photothermal performance indicators of a spray-type translucent roof in this invention.

[0030] Figure 9 This is a graph showing the test results of the photothermal performance of a spray-type translucent roof under the boundary conditions of Example 1 in this invention;

[0031] Figure 10 This is a graph showing the test results of the photothermal performance of a spray-type translucent roof under the boundary conditions of Example 2 in this invention.

[0032] The components and their numbers shown in the picture:

[0033] 11. External environment chamber, 12. Artificial light source, 20. Transparent roof test piece, 31. Spray water supply pipe, 32. Nozzle, 41. Heat metering box, 42. Solar collector, 51. Air conditioner, 52. Air supply duct, 53. Air supply outlet, 54. Return air outlet, 55. Fan, 56. Air supply grille, 57. Return air grille, 61. Water supply pipe, 62. Water pump, 63. Valve, 64. Water supply temperature sensor, 601. Return water temperature sensor, 602. Flow meter, 503. First temperature sensor, 501. Second temperature sensor, 502. Air inlet temperature sensor, 503. First light source radiation intensity sensor, 101. Second light source radiation intensity sensor, 102. First illuminance sensor, 103. Third light source radiation intensity sensor, 401. Second illuminance sensor, 402. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Where there is no conflict, embodiments of the present invention and the various features thereof can be combined with each other, all of which are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown in the figure, this embodiment provides a spray-type light-transmitting roof photothermal performance testing device, which mainly includes: an external environment simulation device, a light-transmitting roof test piece 20, a heat metering device, a supply and return air system, a supply and return water system, a spray device, and a spray system.

[0037] The external environment simulation device is used to simulate various meteorological conditions outside the translucent roof, including but not limited to different steady-state meteorological conditions and different dynamic meteorological conditions. In this embodiment, the external environment simulation device mainly includes an external environment chamber 11 and an artificial light source 12, with the artificial light source 12 installed inside the external environment chamber 11.

[0038] Artificial light source 12 is used to simulate solar radiation. Artificial light source 12 employs a light source with a spectrum close to that of the sun, such as a xenon lamp, and the light from artificial light source 12 is as parallel and uniform as possible. Furthermore, the simulated solar radiation intensity of artificial light source 12 can be adjusted within the range of 0–1000 W / m². 2 In this embodiment, the external environment chamber 11 has a cross-sectional dimension of 2.5m × 2.5m, and the parameter adjustment range is: wind speed 0.5~10m / s, temperature 10~40℃, and relative humidity 40%~98%. An opening is provided on the lower side wall of the external environment chamber 11 for installing the light-transmitting roof test specimen 20 to be tested.

[0039] The light-transmitting test chamber 20 is installed on the lower side wall of the external environment box 11, and the light-transmitting test chamber 20 is located below the artificial light source 12;

[0040] The spraying device in this embodiment includes a nozzle 32, which is located below the artificial light source 12 and above the light-transmitting roof panel 20.

[0041] Nozzle 32 is used to spray the light-transmitting roof test specimen 20 from above. When artificial light source 12 is turned on, it irradiates the light-transmitting roof test specimen 20 from above the spray, thus accurately simulating the scene when sunlight irradiates the light-transmitting roof surface under spray conditions, laying the foundation for subsequent accurate testing of the photothermal performance of the spray-type light-transmitting roof surface.

[0042] The heat metering device is used to detect the heat gain indoors from solar radiation through the light-transmitting roof test piece. In this embodiment, the heat metering device mainly includes a heat metering box 41 and several detection sensors. The heat metering box 41 is located below the light-transmitting roof test piece 20.

[0043] In practice, the heat metering box 41 is located directly below the light-transmitting roof test specimen 20 to be tested, and a solar collector 42 with a pure black surface and a solar radiation absorption coefficient greater than 0.95 is installed.

[0044] The supply and return air system is connected to the heat metering device. In this embodiment, the supply and return air system is used to circulate airflow into the heat metering device. By controlling parameters such as wind speed, temperature, and humidity through the supply and return air system, the air temperature inside the heat metering box 41 is quickly stabilized within a preset range. The parameter adjustment range is: wind speed 0.5~10m / s, temperature 18~26℃, relative humidity 55%~65%.

[0045] The dimensions of the heat metering box 41 can be set to 2.5m×2.5m×1.0m. This size makes the volume small, which is beneficial for the supply and return air system to quickly stabilize its temperature.

[0046] The water supply and return system is used to circulate water to the air supply and return system. The water supplied by the water supply and return system can exchange heat with the air supply and return system to control the temperature of the air supplied by the air supply and return system. The water supply and return system is connected to the air supply and return system.

[0047] The control system in this embodiment is used to control the external environment simulation device, the heat metering device, the supply and return air system, the supply and return water system, and the spray device. In specific implementations, corresponding control modules can be set up for each of the environmental simulation device, the heat metering device, the supply and return air system, the supply and return water system, and the spray device. The control system is electrically connected to the external environment simulation device, the heat metering device, the supply and return air system, the supply and return water system, and the spray device.

[0048] The air supply and return system includes an air conditioner 51, an air supply duct 52, an air supply outlet 53, a return air outlet 54, and a fan 55. The fan 55 is installed in the air supply duct 52. The air inlet of the air conditioner 51 is connected to the return air outlet 54 through the air supply duct 52. The air outlet of the air conditioner 51 is connected to the air supply outlet 53. The air supply outlet 53 and the air outlet are located at opposite ends of the external environment box 11. The external environment box 11 is also provided with an air supply grille 56 and a return air grille 57. A first temperature sensor 501 is installed on the side of the air supply grille facing away from the air supply outlet 53, and a second temperature sensor 502 is installed on the side of the return air grille 57 facing the return air outlet 54.

[0049] The first temperature sensor 501 is used to detect the outlet air temperature Ta2 of the air conditioner 51, and the second temperature sensor 502 is used to detect the return air temperature Ta3 of the heat metering box 41. When the air supply system is working, the air regulated by the air conditioner 51 is delivered from the air outlet of the air conditioner 51 and then through the air supply port 53 to the heat metering box 41. Air in the heat metering box 41 enters the air supply duct 52 through the return air port 54 and returns to the air conditioner 51 through the air supply duct 52 and the air inlet of the air conditioner 51. To allow air circulation in the air supply system, a fan 55 is installed in the air supply duct 52. To improve the air supply effect, the fan 55 can be an axial flow fan. The air supply grille 56 and return air grille 57 installed in the heat metering box 41 in this embodiment can improve the uniformity of the internal flow field of the heat metering box 41, thereby facilitating rapid temperature stabilization of the heat metering box 41. An air inlet temperature sensor 503 is also installed at the air inlet of the air conditioner 51 to detect the temperature of the air inlet.

[0050] In this embodiment, the water supply and return system includes a water supply pipeline 61, a water return pipeline 62, and a water pump 63. The water pump 63 pumps water from the water supply pipeline 61 to the air conditioner 51, and after heat exchange at the air conditioner 51, the water flows back to the water pump 63 through the water return pipeline 62.

[0051] The water pump 63 is installed on the water supply pipeline 61, and a water supply temperature sensor 601 is also installed on the water supply pipeline 61 to detect the system water supply temperature. The return water pipeline 62 is also equipped with a flow meter 603 to measure the flow rate of the supply and return water system, and a return water temperature sensor 602 to detect the system return water temperature. The return water pipeline 62 is connected to the inlet of the water tank, and the water supply pipeline 61 is connected to the outlet of the water tank. In addition, the supply and return water system is also equipped with a valve 64 that can directly connect the return water pipeline 62 and the water supply pipeline 61.

[0052] The external environment chamber 11 is also equipped with a first light source radiation intensity sensor 101, a second light source radiation intensity sensor 102 and a first illuminance sensor 103. The first light source radiation intensity sensor 101 is located below the artificial light source 12 and above the nozzle 32. The second light source radiation intensity sensor 102 and the illuminance sensor are located below the nozzle 32 and below the light-transmitting roof test piece 20.

[0053] The first light source radiation intensity sensor 101 can detect the radiation intensity of the artificial light source 12 when there is no spray, the second light source radiation intensity sensor 102 can detect the radiation intensity of the artificial light source 12 when there is spray, and the first illuminance sensor 103 can detect the illuminance on the outside of the specimen when there is spray.

[0054] In this embodiment, the plurality of detection sensors of the heat metering device include a third light source radiation intensity sensor 401 and a second illuminance sensor 402. The third light source radiation intensity sensor 401 is used to detect the radiation intensity inside the heat metering box 41 below the light-transmitting test specimen 20. The second illuminance sensor 402 is used to detect the illuminance inside the heat metering box 41 below the light-transmitting test specimen 20.

[0055] In this embodiment, the spraying device further includes a spray water supply pipe 31, which is connected to a water source, and a nozzle 32, which is connected to the spray water supply pipe 31. The spray water supply pipe 31 delivers tap water to the nozzle 32, which then sprays the water above the specimen.

[0056] Example 2

[0057] This embodiment also provides a method for testing the photothermal performance of a spray-type translucent roof, which utilizes the photothermal performance testing device for spray-type translucent roofs described in Embodiment 1. Figure 3 As shown, the method includes:

[0058] S1: Obtain the preset experimental requirements;

[0059] S2: Determine the control parameters of the artificial light source according to the preset experimental requirements;

[0060] S3: Control the artificial light source to operate according to the artificial light source control parameters;

[0061] S4: Control the water supply and return system to circulate water to the air supply system, control the air supply and return system to circulate air to the heat metering box, and control the spray device to spray above the test specimen in the light-transmitting roof.

[0062] S5: Obtain the average radiation intensity and average illuminance received by the outer surface of the light-transmitting roof specimen under spray conditions, as well as the thermal parameters of the supply and return air system, supply and return water system, heat metering box, specimen frame and light-transmitting roof specimen;

[0063] S6: Calculate the photothermal performance of the spray-type translucent roof based on the average radiation intensity of the outer surface of the translucent roof test piece, the average illuminance received by the outer surface of the translucent roof test piece, and the thermal parameters.

[0064] like Figure 4 As shown, S2 involves determining the control parameters for the artificial light source, the supply and return air system, and the supply and return water system according to preset experimental requirements.

[0065] S21: Obtain the preset average radiation intensity of the outer surface of the test specimen in the light-transmitting room according to the experimental requirements;

[0066] S22: Obtain the correspondence between the average radiation intensity of the outer surface of the light-transmitting test specimen and the output radiation intensity of the artificial light source;

[0067] The relationship between the average radiance of the outer surface of the translucent roof test specimen and the output radiance of the artificial light source can be obtained experimentally under dry conditions and by fitting the data. Specifically, this includes:

[0068] S221: Control the water supply and return system to circulate water to the air supply system, and control the air supply and return system to circulate air to the heat metering box.

[0069] S222: Divide the outer surface of the translucent roof test piece into multiple area regions;

[0070] S223: Control the artificial light source to output radiation intensity according to the set output intensity;

[0071] S224: Measure the output radiation intensity of the artificial light source in each area;

[0072] S225: Calculate the average output radiation intensity of the artificial light source on the outer surface of the translucent roof test piece corresponding to the current set output radiation intensity of the artificial light source based on the output radiation intensity of the artificial light source in each area.

[0073] S226: Calculate the average output radiation intensity of the artificial light source on the outer surface of the translucent roof test piece based on the output radiation intensity of the artificial light source in each area;

[0074] S227: After changing the set output radiation intensity of the artificial light source, repeat steps S224 to S226 until the average output radiation intensity of the artificial light source corresponding to all set output radiation intensities is obtained.

[0075] S228: By fitting the average output radiation intensity of each set artificial light source to its corresponding output radiation intensity using a regression model, the relationship between the average radiation intensity of the outer surface of the translucent roof panel and the output radiation intensity of the artificial light source is obtained. s =f(S) m,ave ). Among them, S s S represents the output radiation intensity of the artificial light source. m,ave The average radiation intensity of the outer surface of the specimen. The output radiation intensity of the artificial light source can be detected by a first light source radiation intensity sensor located below the artificial light source and above the spray device.

[0076] Wherein S222: Dividing the outer surface of the light-transmitting roof test specimen into multiple area regions includes: based on the height H of the light source distance from the specimen surface and the surface area A of the specimen. s The number N of artificial light sources l Determine the number N of the area regions to be divided.m , where N m It is negatively correlated with H and with A s and N l They are positively correlated. For example, for H = 1.5–2.5m, A s =1.5 * 1.5 = 2.25 m², N l For a device with N=9, m Nine or sixteen are preferred.

[0077] like Figure 5 As shown, the correspondence obtained through the experiment is S s =0.6293×S m,ave -22.935.

[0078] S23: Determine the preset output radiation intensity of the corresponding artificial light source based on the preset average radiation intensity of the outer surface of the light-transmitting roof test piece and the correspondence between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source.

[0079] For example, when the radiation intensity S on the outer surface of the light-transmitting test specimen is determined according to experimental requirements... m,ave 600W / m 2 Substituting this radiation intensity into the corresponding formula, the preset output radiation intensity of the artificial light source is calculated to be 354.6 W / m². 2 .

[0080] For example, when conducting dynamic experiments, the required hourly solar radiation intensity (which is S) is used. m,ave Calculate the hourly setpoint S of the artificial light source. s For example, taking the hourly solar radiation intensity of typical daily meteorological data in Guangzhou as an example, the hourly setpoint S of artificial light sources can be calculated based on the aforementioned correspondence. s The calculation results are as follows Figure 6 As shown.

[0081] like Figure 7 As shown, in this embodiment, step S5: obtaining the average radiation intensity and average illuminance received by the outer surface of the light-transmitting roof test specimen under spray conditions, as well as the thermal parameters of the second supply and return air system, the supply and return water system, the heat metering box, the test specimen frame, and the light-transmitting roof test specimen, includes:

[0082] S51: Obtain the current output radiation intensity of the artificial light source;

[0083] S52: Determine the average radiation intensity of the outer surface of the transparent roof test piece based on the correspondence between the current output radiation intensity of the artificial light source and the average radiation intensity of the outer surface of the transparent roof test piece and the output radiation intensity of the artificial light source.

[0084] The method for accurately obtaining the correspondence between the average radiation intensity of the outer surface of the translucent test specimen and the output radiation intensity of the artificial light source has been described in detail above and will not be repeated here.

[0085] S53: Obtain the correspondence between the average radiation intensity of the outer surface of the test specimen in the light-transmitting room and the average illuminance received by the outer surface of the test specimen in the light-transmitting room;

[0086] This step specifically includes:

[0087] S521: Divide the outer surface of the translucent roof test piece into multiple area regions;

[0088] S522: Controls the artificial light source to output radiation intensity according to the set output intensity;

[0089] S523: Measure the radiation intensity and illuminance of each area; specifically, the radiation intensity sensor and the illuminance sensor of each area can be detected by using a second light source radiation intensity sensor and a first illuminance sensor, which are set below the nozzle and above the light-transmitting roof test piece, respectively;

[0090] S524: Obtain the average radiation intensity of the outer surface of the translucent test specimen based on the radiation intensity of each area, and obtain the average illuminance received by the outer surface of the translucent test specimen based on the illuminance of each area.

[0091] S525: Based on the average radiant intensity and corresponding average illuminance of the artificial light source on the outer surface of the translucent roof test specimen, the relationship between the average radiant intensity and the average illuminance received by the outer surface of the translucent roof test specimen under spray conditions is determined by regression model.

[0092] The regression model obtained through experiments is: I m,ave =42.391×S m,ave +1645.4. I m,av The average illuminance received by the outer surface of the translucent test specimen.

[0093] S54: Determine the average illuminance received by the outer surface of the light-transmitting test specimen based on the correspondence between the average radiation intensity of the outer surface of the light-transmitting test specimen and the average illuminance received by the outer surface of the light-transmitting test specimen.

[0094] Since the photothermal performance testing of a spray-type translucent roof needs to be carried out under spray conditions, the sensor's detection of the radiation intensity and illuminance received by the outer surface of the test specimen under spray conditions is affected by the spray. Therefore, how to accurately obtain the radiation intensity and illuminance received by the outer surface of the test specimen under spray conditions has long been a problem that has troubled those skilled in the art.

[0095] This embodiment employs an indirect detection method, measuring the average radiant intensity of the outer surface of the translucent roof test specimen under spray conditions. A first light source radiation sensor positioned above the spray device detects the radiant intensity at the current location. Then, the average radiant intensity of the outer surface of the translucent roof test specimen is determined using the correspondence between the output radiant intensity of the artificial light source at that location and the average radiant intensity of the outer surface of the translucent roof test specimen. Finally, the average illuminance received by the outer surface of the translucent roof test specimen is determined using the correspondence between the average radiant intensity of the outer surface of the translucent roof test specimen and the average illuminance received by the outer surface of the translucent roof test specimen. Since the first light source radiation sensor is unaffected by the spray device, the average radiant intensity of the outer surface of the translucent roof test specimen unaffected by the spray can be accurately calculated using the radiant intensity detected by the first light source radiation sensor above the spray device and the aforementioned correspondence.

[0096] S54: Detect the air inlet and outlet temperatures of the air conditioner in the supply and return air system; detect the return air temperature of the heat metering box; detect the inner and outer surface temperatures of the four walls of the heat metering box; detect the inlet and outlet water temperatures of the air conditioner in the supply and return water system; detect the inner and outer surface temperatures of the test specimen frame; detect the inner and outer surface temperatures of the light-transmitting roof test specimen; and detect the average solar radiation intensity and average illuminance received by the lower surface of the test specimen.

[0097] like Figure 8 As shown, in this embodiment, step S6: calculating the photothermal performance of the spray-type translucent roof based on the average radiation intensity of the outer surface of the translucent roof component, the average illuminance received by the outer surface of the translucent roof component, and the thermal parameters includes:

[0098] S61: Based on thermal parameters and formulas

[0099]

[0100] Calculate the heat gain Q from indoor solar radiation. t The thermal parameters include: the heat capacity C of the cooling water, the density ρ of the cooling water, and the inlet water temperature T of the air conditioner. w,i Air conditioner outlet water temperature T w,e Cooling water flow rate G, air inlet temperature T of the air conditioner in the supply and return air system a1 Air conditioner outlet temperature T a2 , heat metering box return air temperature T a3 The inner surface temperature T of the four walls of the heat metering box bx,i Temperature T of the outer surface of the four walls of the heat metering box bx,e The inner surface temperature T of the specimen framekx,i The outer surface temperature T of the specimen frame kx,e Where x∈{1,2,3,4}, the heat flux coefficient M per unit area of ​​the heat metering box bx Surface area A of heat metering box bx The heat flux coefficient per unit area M of the specimen frame kx Surface area A of the specimen frame kx The inner surface temperature T of the test specimen in the light-transmitting room s,i Surface temperature T s,e The heat flux per unit area M of the translucent room test specimen s The surface area A of the translucent room interview piece s ;

[0101] S62: According to the formula Calculate the solar thermal gain coefficient SHGC, where S m,ave The average radiation intensity of the outer surface of the translucent test specimen;

[0102] S63: Calculate T according to the formula sol =S r,ave / S m,ave Calculate the direct transmittance of solar radiation T sol , where S r,ave The average solar radiation intensity received by the lower surface of the translucent roof test specimen;

[0103] S64: Calculate T according to the formula vis =I r,ave / I m,ave Visible light transmittance T vis , where I r,ave I represents the average illuminance received by the lower surface of the test specimen in the light-transmitting room. m,av The average illuminance received by the outer surface of the translucent test specimen.

[0104] To obtain the photothermal performance of the translucent roof more accurately, the following method can be used to correct the test results. Step S6: Calculating the photothermal performance of the spray-type translucent roof based on the average radiation intensity of the outer surface of the translucent roof test specimen, the average illuminance received by the outer surface of the translucent roof test specimen, and the thermal parameters includes:

[0105] S65: Determine the amount of residual water on the outer surface of the light-transmitting roof test piece based on the spray flow rate and the drainage volume of the outer surface of the light-transmitting roof test piece;

[0106] The residual water volume Vf = Vspray - Vdrain, where Vspray is the spray flow rate and Vdrain is the drainage volume.

[0107] S66: Determine the thickness of the water film on the outer surface of the translucent roof test specimen based on the amount of residual water on the outer surface of the translucent roof test specimen;

[0108] The thickness of the water film, δfilm, is given by the formula: δfilm = (Vspray - Vdrain - Mevap) / ρw / As, where ρw is the density of water.

[0109] S67: Determine the amount of moisture evaporation from the outer surface of the test specimen in a light-transmitting room based on the outer surface temperature and ambient air humidity;

[0110] Where the evaporation rate (mevap) is the evaporation rate per unit area (kg / (m²)). 2 ·s));

[0111] mevap = hm[Psat(Tsurf) - Pv, air]. hm is the mass transfer coefficient (kg / (m²)). 2 The value of Psat(Tsurf) can be calibrated experimentally. Psat(Tsurf) is the saturated water vapor partial pressure (Pa) of water at the membrane surface temperature Tsurf, and Pv,air is the actual water vapor partial pressure (Pa) of indoor / outdoor air. It can be calculated from relative humidity, air pressure, and temperature.

[0112] For a given time interval Δt, the mass evaporated is: Mevap = mevap × As × Δt.

[0113] S68: The amount of heat gain Q inside the room due to solar radiation is determined by the evaporation of moisture from the outer surface of the light-transmitting roof test piece. t Make corrections and base them on the corrected solar radiation indoor heat gain Q. t Update the solar thermal gain coefficient (SHGC);

[0114] That is, from Q t After subtracting the heat lost due to the evaporation of moisture from the outer surface, we obtain the corrected Q. t Then, based on the corrected solar radiation indoor heat gain Q... t Update the solar thermal gain coefficient (SHGC);

[0115] S68: Obtain the optical correction factor based on the thickness of the water film;

[0116] This step first establishes the relationship between water film thickness and optical transmission change. A set of correspondences between "water film thickness" and "optical transmission change value" can be established in advance or during the experiment based on reference data and experimental calibration.

[0117] This correspondence can be expressed as: how much the transmittance of the light-transmitting material increases or decreases compared to dry conditions when the water film is within a certain thickness range (this can be expressed as a ratio or percentage).

[0118] Based on the correlation between "water film thickness and optical transmission change," the "transmittance adjustment amount" for the roof under the current operating conditions is determined. This adjustment amount is defined as the "optical correction factor." For example, if the transmittance is a certain baseline value under dry conditions, and the transmittance change due to the water film is within a certain percentage range, then this percentage change or ratio change can be used as the optical correction factor. If the optical correction factor is greater than 1, it indicates that the transmittance is improved compared to the dry condition due to the water film; if the optical correction factor is less than 1, it indicates that the transmittance is reduced. This optical correction factor is output and stored as key reference data for subsequent correction of solar radiation transmittance and visible light transmittance.

[0119] S69: Correct the solar radiation direct transmission ratio and visible light transmittance based on the optical correction factor;

[0120] This step multiplies the original solar radiation direct transmission ratio by an optical correction factor to obtain the corrected solar radiation direct transmission ratio, and multiplies the original visible light transmittance by an optical correction factor to obtain the corrected visible light transmittance. These two correction values ​​better reflect the optical changes caused by the formation of a water film on the roof surface under spray conditions.

[0121] The following describes examples of using the apparatus and method of the present invention to detect the photothermal performance of a light-transmitting roof under different boundary conditions.

[0122] Example 1

[0123] Taking a double-glazed roof with a configuration of 6mm clear glass + 12mm argon gas + 6mm clear glass as an example, according to JGJ / T151-2008 "Code for Thermal Calculation of Building Doors, Windows and Glass Curtain Walls", its theoretical calculated value of SHGC is 0.70.

[0124] Meanwhile, the boundary conditions of the above calculation procedure are reproduced using the detection device and method provided by this invention, wherein the external environment chamber is set at a temperature of 30°C and a wind speed of 2 m / s, and the solar radiation intensity received by the surface of the glass specimen is ensured to be 500 W / m. 2 The heat metering chamber was set to a temperature of 25℃. After the device stabilized, the measured SHGC value was calculated to be 0.702 according to the formula, with a relative error of only 0.3% compared to the theoretical calculation value, indicating that the detection device has high accuracy. The SHGC measurement curve is shown in [reference needed]. Figure 9 As shown.

[0125] Example 2

[0126] To further verify the accuracy of the testing device based on Example 1, the boundary conditions were modified according to GB / T30592-2014 "Test Method for Solar Heat Gain Coefficient of Translucent Envelopes". Specifically, the external environment chamber was set to a temperature of 26.5℃ and a wind speed of 2m / s, and the solar radiation intensity received by the glass specimen surface was ensured to be 600W / m². 2 The temperature of the heat metering chamber was set to 25℃. After the device stabilized, the method of this invention calculated the measured value of SHGC to be 0.73, with a relative error of only 4.3% compared to the theoretical calculated value, indicating that the detection device has high accuracy.

[0127] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention. The functional blocks shown in the above-described structural block diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the desired tasks. The programs or code segments can be stored in a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. The code segment can be downloaded via computer networks such as the Internet or intranets. It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0128] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A device for testing the photothermal performance of translucent roofs under various meteorological conditions, characterized in that, include: An external environment simulation device includes an external environment box and an artificial light source. The artificial light source is installed inside the external environment box. The external environment simulation device and the spraying device are used to simulate environmental conditions under different steady-state meteorological conditions and dynamic meteorological conditions under spraying conditions. A translucent indoor test specimen is installed on the lower side wall of the external environment box, and the translucent indoor test specimen is located below the artificial light source; A spraying device includes a nozzle located below an artificial light source and above a translucent roof test specimen. The external environment chamber also includes a first light source radiation intensity sensor, a second light source radiation intensity sensor, and a first illuminance sensor. The first light source radiation intensity sensor is located below the artificial light source and above the nozzle, while the second light source radiation intensity sensor and the first illuminance sensor are located below the nozzle and above the translucent roof test specimen. The first light source radiation intensity sensor detects the radiation intensity of the artificial light source when there is no spray, and the second light source radiation intensity sensor detects the radiation intensity of the artificial light source when there is spray. The heat metering device includes a heat metering box, a third light source radiation intensity sensor, and a second illuminance sensor, wherein the heat metering box is located below the light-transmitting roof test specimen; A supply and return air system is used to circulate airflow into the heat metering device, and the supply and return air system is connected to the heat metering device. A water supply and return system is used to supply water to the air supply and return system, and the water supply and return system is connected to the air supply and return system. A control system is used to control an external environment simulation device, a heat metering device, a supply and return air system, a supply and return water system, and a spray device. The control system is electrically connected to the external environment simulation device, the heat metering device, the supply and return air system, the supply and return water system, and the spray device.

2. The device for testing the photothermal performance of a light-transmitting roof under various meteorological conditions according to claim 1, characterized in that, The artificial light source is used to simulate solar radiation, and the intensity of the simulated solar radiation is adjustable from 0 to 1000 W / m. 2 .

3. The device for detecting the photothermal performance of a light-transmitting roof under various meteorological conditions according to claim 1, characterized in that, The wind speed adjustment range of the external environment simulation device is 0.5~10 m / s.

4. The device for detecting the photothermal performance of a light-transmitting roof under various meteorological conditions according to claim 1, characterized in that, The temperature adjustment range of the external environment simulation device is 10~40℃.

5. The device for testing the photothermal performance of a light-transmitting roof under various meteorological conditions according to claim 4, characterized in that, The relative humidity adjustment range of the external environment simulation device is 40%~98%.

6. The device for detecting the photothermal performance of a light-transmitting roof under various meteorological conditions as described in claim 4, characterized in that, The spraying device also includes a spray water supply pipe, which is connected to a water source. The nozzle is connected to the spray water supply pipe, and the artificial light source illuminates the light-transmitting roof test piece from above the spray after it is turned on.

7. A method for testing the light and heat performance of translucent roofs under various meteorological conditions, characterized in that, The method involves using the light-transmitting roof photothermal performance testing device under various meteorological conditions as described in any one of claims 1 to 6, wherein the testing is performed by: Obtain the preset experimental requirements; Determine the control parameters of the artificial light source according to the preset experimental requirements; The artificial light source is controlled to operate according to the aforementioned artificial light source control parameters; Control the water supply and return system to circulate water to the air supply and return system, control the air supply and return system to circulate air to the heat metering box, and control the spray device to spray above the test specimens in the light-transmitting roof. The average radiant intensity and average illuminance received on the outer surface of the light-transmitting roof specimen under spray conditions were obtained, along with the thermal parameters of the supply and return air system, supply and return water system, heat metering box, specimen frame, and light-transmitting roof specimen. The photothermal performance of the spray-type translucent roof is calculated based on the average radiation intensity of the outer surface of the translucent roof test specimen, the average illuminance received by the outer surface of the translucent roof test specimen, and the aforementioned thermal parameters.

8. The method for testing the photothermal performance of a translucent roof under various meteorological conditions as described in claim 7, characterized in that, The process of determining the control parameters for the artificial light source, the supply and return air system, and the supply and return water system according to preset experimental requirements includes: The preset average radiation intensity of the outer surface of the light-transmitting test specimen was obtained according to the experimental requirements. Obtain the correspondence between the average radiance of the outer surface of the test specimen in the light-transmitting room and the output radiance of the artificial light source; The preset output radiation intensity of the artificial light source is determined based on the preset average radiation intensity of the outer surface of the light-transmitting test specimen and the correspondence between the average radiation intensity of the outer surface of the light-transmitting test specimen and the output radiation intensity of the artificial light source. When conducting dynamic experiments, the hourly set value of the artificial light source is calculated based on the required hourly solar radiation intensity.

9. The method for testing the photothermal performance of a translucent roof under various meteorological conditions according to claim 7, characterized in that, The relationship between the average radiance of the outer surface of the translucent test specimen and the output radiance of the artificial light source was obtained, including: S222: Divide the outer surface of the translucent roof test piece into multiple area regions; S223: Control the artificial light source to output radiation intensity according to the set output intensity; S224: Measure the output radiation intensity of the artificial light source in each area; S225: Calculate the average output radiation intensity of the artificial light source on the outer surface of the translucent roof test piece corresponding to the current set output radiation intensity of the artificial light source based on the output radiation intensity of the artificial light source in each area. S226: Calculate the average output radiation intensity of the artificial light source on the outer surface of the translucent roof test piece based on the output radiation intensity of the artificial light source in each area; S227: After changing the set output radiation intensity of the artificial light source, repeat steps S224 to S226 until the average output radiation intensity of the artificial light source corresponding to all set output radiation intensities is obtained. S228: By using a regression model to fit the average output radiation intensity of the artificial light source corresponding to the set output radiation intensity of each artificial light source, the correspondence between the average radiation intensity of the outer surface of the translucent roof test piece and the output radiation intensity of the artificial light source is obtained.

10. The method for testing the photothermal performance of a translucent roof under various meteorological conditions according to claim 7, characterized in that, The acquisition of the average radiant intensity and average illuminance received on the outer surface of the translucent roof specimen under spray conditions, as well as the thermal parameters of the second supply and return air system, the supply and return water system, the heat metering box, the specimen frame, and the translucent roof specimen, includes: Obtain the current output radiation intensity of the artificial light source; The average radiation intensity of the outer surface of the transparent roof test piece is determined based on the correspondence between the current output radiation intensity of the artificial light source and the average radiation intensity of the outer surface of the test piece and the output radiation intensity of the artificial light source. To obtain the correspondence between the average radiation intensity of the outer surface of the test specimen in the light-transmitting room and the average illuminance received by the outer surface of the test specimen in the light-transmitting room; The average illuminance received by the outer surface of the translucent specimen is determined based on the correspondence between the average radiant intensity of the outer surface of the translucent specimen and the average illuminance received by the outer surface of the translucent specimen.

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