Device and method for detecting photo-thermal performance of light-transmitting roof under various meteorological conditions

Abstract

The invention belongs to the technical field of photo-thermal performance detection of building envelope structures, and particularly relates to a light-transmitting roof photo-thermal performance detection device under various meteorological conditions and a detection method of the light-transmitting roof photo-thermal performance detection device. The invention discloses a light-transmitting roof photo-thermal performance detection device under various meteorological conditions. The device comprises a heat metering device, an air supply and return system, a water supply and return system, a control system and an external environment simulation device, wherein the external environment simulation device comprises an external environment box and an artificial light source; the light-transmitting roof test piece is installed on the lower side wall of the external environment box, and the external environment simulation device and the spraying device are used for simulating the environment conditions of different steady-state meteorological conditions and dynamic meteorological conditions under the spraying condition; the spraying device comprises a nozzle; a first light source radiation intensity sensor, a second light source radiation intensity sensor and a first illuminance sensor are further arranged in the outer environment box. According to the invention, the photo-thermal performance of the light-transmitting roof under the spraying condition can be accurately evaluated.

Description

[0001] This application is a divisional application of the invention patent application filed on January 23, 2025, with the invention name “Spray-type translucent roof light and thermal performance detection device and detection method thereof” and application number 2025101082666. Technical Field

[0002] The present invention belongs to the technical field of light and heat performance detection of building envelope structures, and specifically provides a light and heat performance detection device and a detection method for a light-transmitting roof under various meteorological conditions. Background Art

[0003] Translucent roof is a type of building roof whose main purpose is to provide natural lighting. Due to its advantages such as no obstruction, good visual effects and light load, it is widely used in large public buildings such as airports and commercial complexes.

[0004] While translucent roofs can effectively improve indoor natural lighting and reduce building lighting energy consumption, their unique thermal properties can significantly negatively impact the indoor thermal environment. To improve the indoor thermal environment and reduce air conditioning energy consumption, spray-assisted translucent roofs with spray-assisted systems have emerged, achieving the "triple win" of roof cooling, shading, and daylighting. While methods exist for measuring the solar heat gain coefficient (SHGC) of translucent building envelopes using devices, these methods and devices are not suitable for evaluating the thermal performance of translucent roofs under spray conditions. Summary of the Invention

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

[0006] An external environment simulation device, comprising an external environment box and an artificial light source, wherein the artificial light source is installed in the external environment box, and the external environment simulation device and the spray device are used to simulate environmental conditions of different steady-state meteorological conditions and dynamic meteorological conditions under spray conditions;

[0007] A light-transmitting roof test piece is installed at the lower side wall of the external environmental box, and the light-transmitting roof test piece is located below the artificial light source;

[0008] A spray device comprising a nozzle, the nozzle being located below the artificial light source and above the light-transmitting roof test piece; the external environmental chamber further comprising 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 light-transmitting roof test piece;

[0009] a heat metering device, comprising a heat metering box, a third light source radiation intensity sensor, and a second illumination sensor, wherein the heat metering box is located below the light-transmitting roof test piece;

[0010] a supply and return air system, used for circulating air flow into the heat metering device, wherein the supply and return air system is in communication with 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] The control system 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. 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] In a second aspect, the present invention provides a method for detecting the light and thermal performance of a light-transmitting roof under various meteorological conditions, using the light and thermal performance detection device for light-transmitting roof under various meteorological conditions described in the first aspect. The method comprises:

[0014] Get preset experimental requirements;

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

[0016] Controlling the operation of the artificial light source according to the artificial light source control parameters;

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

[0018] Obtain the average radiation intensity and average illuminance received by the outer surface of the light-transmitting roof test piece under spray conditions, as well as the thermal parameters of the supply and return air system, supply and return water system, heat metering box, test piece frame and light-transmitting roof test piece;

[0019] The light and heat performance of the spray-type light-transmitting roof is calculated according to the average radiation intensity of the outer surface of the light-transmitting roof test piece, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters.

[0020] Beneficial Effects: The multi-sensor detection device and method for the photothermal performance of a translucent roof of the present invention, through an external environment simulation device and a spray device, can accurately simulate environmental conditions under different boundary conditions, as well as different steady-state and dynamic meteorological conditions, under spray conditions. The thermal metering device accurately detects the photothermal performance of the spray-type translucent roof under these conditions, thereby accurately measuring the solar radiation intensity received by the surface of the translucent enclosure under spray conditions. Furthermore, the photothermal performance of the spray-type translucent roof under different boundary conditions can be monitored and evaluated. Furthermore, the present invention uses a water supply and return system and an air supply and return system to quickly stabilize the temperature in the thermal metering box within a preset range, further improving detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, and these are all within the scope of protection of the present invention.

[0022] Figure 1 This is a front view of the spray-type light-transmitting roof light and heat performance detection device of the present invention;

[0023] Figure 2 A top view of the spray-type light-transmitting roof light and heat performance detection device of the present invention;

[0024] Figure 3 Schematic diagram of the process of the method for testing the light and heat performance of a spray-type light-transmitting roof according to the present invention;

[0025] Figure 4 A schematic flow chart of a method for determining artificial light source control parameters according to experimental requirements in the present invention;

[0026] Figure 5 A fitting curve of the average radiation intensity of the outer surface of the light roof test piece of the present invention and the output radiation intensity of the artificial light source;

[0027] Figure 6 is a graph showing the relationship between hourly solar radiation intensity values and corresponding hourly setting values of artificial light sources according to the present invention;

[0028] Figure 7 It is a flowchart of the method for obtaining various detection parameters in the present invention;

[0029] Figure 8 Schematic diagram of the process of calculating the index of the light and heat performance of the spray-type light-transmitting roof in the present invention;

[0030] Figure 9 This is a graph showing the light and heat performance test results of the spray-type light-transmitting roof under the boundary conditions of Example 1 in the present invention;

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

[0032] Parts and their numbers in the picture:

[0033] External environment box 11, artificial light source 12, translucent roof test piece 20, spray water supply pipe 31, nozzle 32, heat metering box 41, heat collector 42, air conditioner 51, air supply pipeline 52, air supply outlet 53, return air outlet 54, fan 55, air supply grille 56, return air grille 57, water supply pipeline 61, return water pipeline 62, water pump 63, valve 64, water supply temperature sensor 601, return water temperature sensor 602, flow meter 603, 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 DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in 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 article, 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 orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. Moreover, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations, elements defined by the phrase "comprising..." do not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the elements. The embodiments of the present invention and the features thereof may be combined with each other if there is no conflict, and all are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a spray-type translucent roof light and thermal performance detection device, which mainly includes: an external environment simulation device, a translucent 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 light-transmitting roof, including but not limited to different steady-state meteorological conditions and different dynamic meteorological conditions. The external environment simulation device in this embodiment mainly includes an external environment box 11 and an artificial light source 12, and the artificial light source 12 is installed in the external environment box 11;

[0038] The artificial light source 12 is used to simulate solar radiation. The artificial light source 12 uses a light source with a spectrum close to the solar spectrum, such as a xenon lamp, and the light of the artificial light source 12 is as parallel and uniform as possible. In addition, the intensity of the solar radiation simulated by the artificial light source 12 can be adjusted within a range of 0 to 1000 W / m 2 In this embodiment, the cross-sectional dimensions of the external environmental chamber 11 are 2.5m x 2.5m, and the parameter adjustment range is: wind speed 0.5-10m / s, temperature 10-40°C, and relative humidity 40%-98%. A hole is provided on the lower side wall of the external environmental chamber 11 to install the light-transmitting roof test piece 20 to be tested;

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

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

[0041] The nozzle 32 is used to spray the light-transmitting roof test piece 20 from above the light-transmitting roof test piece. After the artificial light source 12 is turned on, it irradiates the light-transmitting roof test piece 20 from above the spray, thereby accurately simulating the scene when sunlight irradiates the light-transmitting roof under the spray condition, laying the foundation for the subsequent accurate detection of the light and heat performance of the spray-type light-transmitting roof.

[0042] The heat metering device is used to detect the amount of heat gained indoors by solar radiation through the light-transmitting roof test piece. The heat metering device in this embodiment mainly includes a heat metering box 41 and a plurality of detection sensors. The heat metering box 41 is located below the light-transmitting roof test piece 20.

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

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

[0045] The size of the heat metering box 41 can be set to 2.5m×2.5m×1.0m. Such a size makes the volume smaller, which is conducive to the supply and return air system to quickly stabilize its temperature.

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

[0047] The control system of this embodiment is used to control the external environment simulation device, the heat metering device, the air supply and return system, the water supply and return system, and the spray device. In a specific implementation, corresponding control modules can be provided for each of these devices. The control system is electrically connected to the external environment simulation device, the heat metering device, the air supply and return system, the water supply and return 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 arranged 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 respectively 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 provided on the side of the air supply grille facing away from the air supply outlet 53, and a second temperature sensor 502 is provided 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 in operation, air conditioned by the air conditioner 51 is discharged from the air outlet of the air conditioner 51 and transported to the heat metering box 41 through the air supply port 53. The air in the heat metering box 41 enters the air supply duct 52 through the return air port 54 and then returns to the air conditioner 51 through the air inlet of the air conditioner 51. To circulate the air in the air supply system, this embodiment includes a fan 55 in the air supply duct 52. To improve air supply efficiency, the fan 55 can be an axial flow fan. The air supply grille 56 and return air grille 57 provided in the heat metering box 41 in this embodiment improve the uniformity of the flow field within the heat metering box 41, thereby facilitating rapid temperature stabilization of the heat metering box 41. An air inlet temperature sensor 503 is also provided at the air inlet of the air conditioner 51 to detect the air inlet temperature of the air conditioner 51.

[0050] In this embodiment, the water supply and return system includes a water supply pipeline 61, a 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 return pipeline 62.

[0051] A water pump 63 is installed on the water supply line 61. A water supply temperature sensor 601 is also installed on the water supply line 61 to monitor the system's supply water temperature. The return line 62 is also equipped with a flowmeter 603 to measure the flow rate of the supply and return water system, and a return water temperature sensor 602 to monitor the return water temperature. The return line 62 is connected to the water inlet of the water tank, while the supply line 61 is connected to the water outlet of the water tank. Furthermore, the return water system is equipped with a valve 64 that directly connects the return line 62 and the supply line 61.

[0052] The external environment box 11 is also provided with a first light source radiation intensity sensor 101, a second light source radiation intensity sensor 102 and a first illuminance sensor 103, wherein the first light source radiation intensity sensor 101 is located below the artificial light source 12 and above the nozzle 32, and 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 without spray, the second light source radiation intensity sensor 102 can detect the radiation intensity of the artificial light source 12 under spray, and the first illuminance sensor 103 can detect the illuminance outside the test piece under spray.

[0054] In this embodiment, the multiple 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 within the heat metering box 41 below the light-transmitting roof test piece 20. The second illuminance sensor 402 is used to detect the illuminance within the heat metering box 41 below the light-transmitting roof test piece 20.

[0055] In this embodiment, the spray device further includes a spray water supply pipe 31, the spray water supply pipe 31 being connected to a water source, and the nozzle 32 being 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 detecting the light and heat performance of a spray-type light-transmitting roof, which uses the spray-type light and heat performance detection device of embodiment 1 to perform detection. Figure 3 As shown, the method includes:

[0058] S1: Obtain preset experimental requirements;

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

[0060] S3: Controlling the operation of the artificial light source 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 light-transmitting roof test piece;

[0062] S5: Obtain the average radiation intensity and the 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 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;

[0063] S6: Calculating the photothermal performance of the spray-type translucent roof according to 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, wherein S2: determining the artificial light source control parameters, the supply and return air system control parameters, and the supply and return water system control parameters according to the preset experimental requirements:

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

[0066] S22: Obtaining the corresponding relationship 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;

[0067] The corresponding relationship 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 can be obtained through experiments under dry conditions and experimental data fitting, specifically including:

[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: Dividing the outer surface of the light-transmitting roof test piece into a plurality of area regions;

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

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

[0072] S225: Calculating the average output radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece corresponding to the output radiation intensity set by the current artificial light source based on the output radiation intensity of the artificial light source in each area;

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

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

[0075] S228: Using the regression model, the average output radiation intensity of the artificial light source corresponding to the output radiation intensity of each set artificial light source is fitted to obtain the corresponding relationship S 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. s =f(S m,ave ). Where S s is the output radiation intensity of the artificial light source, S m,ave The output radiation intensity of the artificial light source can be detected by a first light source radiation intensity sensor disposed below the artificial light source and above the spray device.

[0076] Wherein S222: said dividing the outer surface of the light-transmitting roof test piece into a plurality of area regions includes: s and the number of artificial light fixtures N l Determine the number of area regions N to be dividedm , where N m Negatively correlated with H and negatively correlated with A s and N l For example, for H = 1.5 to 2.5 m, A s =1.5*1.5=2.25m2, N l =9 device, N m 9 or 16 are preferred.

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

[0078] S23: determining a preset output radiation intensity of the corresponding artificial light source according to the preset average radiation intensity of the outer surface of the light-transmitting roof test piece and the corresponding relationship 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, according to the experimental requirements, the radiation intensity S m,ave 600W / m 2 When the radiation intensity is substituted into the corresponding relationship, the preset output radiation intensity of the artificial light source is calculated to be 354.6W / m 2 .

[0080] For example, when conducting a dynamic experiment, the required hourly solar radiation intensity (the value is S m,ave ) Calculate the hourly setting value S of the artificial light source s For example, taking the hourly solar radiation intensity of Guangzhou’s typical day weather data as an example, the hourly setting value S of the artificial light source can be calculated based on the above corresponding relationship. s , the calculation results are as follows Figure 6 shown.

[0081] like Figure 7 As shown, in this embodiment, the S5: obtaining the average radiation intensity and the average illuminance received by the outer surface of the light-transmitting roof test piece under the spray condition, 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 piece frame, and the light-transmitting roof test piece include:

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

[0083] S52: determining the average radiation intensity of the outer surface of the corresponding light-transmitting roof test piece according to the corresponding relationship between the output radiation intensity of the current artificial light source and 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;

[0084] The method for accurately obtaining the corresponding relationship 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 has been described in detail in the previous article and will not be repeated here.

[0085] S53: Obtaining a correspondence between an average radiation intensity on the outer surface of the light-transmitting roof test piece and an average illuminance received on the outer surface of the light-transmitting roof test piece;

[0086] This step specifically includes:

[0087] S521: Divide the outer surface of the light-transmitting roof test piece into a plurality of area regions;

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

[0089] S523: Measure the radiation intensity and illuminance of each area. Specifically, the radiation intensity and illuminance of each area can be measured using a second light source radiation intensity sensor and a first illuminance sensor disposed below the nozzle and above the light-transmitting roof test piece.

[0090] S524: Obtain an average radiation intensity of the outer surface of the light-transmitting roof test piece according to the radiation intensity of each area, and obtain an average illuminance received by the outer surface of the corresponding light-transmitting roof test piece according to the illuminance of each area;

[0091] S525: Determine, by using a regression model, the correspondence between the average radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece and the average illuminance received by the outer surface of the light-transmitting roof test piece under the spray condition;

[0092] The regression model obtained through the experiment is: m,ave =42.391×S m,ave +1645.4. I m,av It is the average illuminance received by the outer surface of the light-transmitting roof test piece.

[0093] S54: determining the average illuminance received by the outer surface of the light-transmitting roof test piece according to the average radiation intensity of the outer surface of the light-transmitting roof test piece and the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illuminance received by the outer surface of the light-transmitting roof test piece;

[0094] Since the photothermal performance test of the spray-type translucent roof needs to be carried out under spray conditions, the sensor's detection of the radiation intensity on the outer surface of the translucent roof test piece and the illuminance received on the outer surface of the test piece will be affected by the spray. Therefore, how to accurately obtain the radiation intensity on the outer surface of the translucent roof test piece and the illuminance received on the outer surface of the test piece under spray conditions has long been a problem that has plagued technical personnel in this field.

[0095] To address this issue, this embodiment employs an indirect detection method for the average radiation intensity and average radiation intensity of the outer surface of the light-transmitting roof test piece under spray conditions. A first light source radiation sensor positioned above the spray device detects the radiation intensity at the current location. The corresponding average radiation intensity of the outer surface of the light-transmitting roof test piece is then determined using the corresponding relationship between the output radiation intensity of the artificial light source at that location and 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. The corresponding average illuminance received by the outer surface of the light-transmitting roof test piece is then determined based on the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illuminance received by the outer surface of the light-transmitting roof test piece. Because the first light source radiation sensor is unaffected by the spray device, the radiation intensity detected by the first light source radiation sensor above the spray device and the aforementioned corresponding relationship can be used to accurately convert the average radiation intensity and average illuminance received by the outer surface of the light-transmitting roof test piece unaffected by the spray.

[0096] S54: Detect the air inlet temperature and outlet temperature 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 air conditioner water inlet temperature and outlet water temperature of the air conditioner supply and return water system, detect the inner and outer surface temperatures of the test piece frame, detect the inner and outer surface temperatures of the light-transmitting roof test piece, and detect the average solar radiation intensity and average illumination received by the lower surface of the test piece.

[0097] like Figure 8 As shown, in this embodiment, the step S6 of calculating the photothermal performance of the spray-type translucent roof according to 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 includes:

[0098] S61: According to thermal parameters and formulas

[0099]

[0100] Calculate the indoor solar radiation heat gain Q t The thermal parameters include: the heat capacity C of cooling water, the density ρ of cooling water, the inlet water temperature T of air conditioner w,i , air conditioner outlet water temperature T w,e , cooling water flow G, air inlet temperature T of the air conditioner for 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 of the four walls of the heat metering box is T bx,i , the outer surface temperature of the four walls of the heat metering box is T bx,e , the inner surface temperature of the specimen frame Tkx,i , the outer surface temperature of the specimen frame T kx,e Where x∈{1,2,3,4}, the unit area heat flux coefficient M of the heat metering box bx , heat metering box surface area A bx , heat flux coefficient per unit area of the specimen frame M kx , specimen frame surface area A kx , the inner surface temperature T of the light-transmitting roof test piece s,i , external surface temperature T s,e , heat flux coefficient per unit area of transparent roof test piece M s and the surface area A of the light-transmitting roof test piece s ;

[0101] S62: According to the formula Calculate the solar heat gain coefficient SHGC, where S m,ave is the average radiation intensity on the outer surface of the light-transmitting roof test piece;

[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 is the average solar radiation intensity received by the lower surface of the translucent roof test piece;

[0103] S64: Calculate T according to the formula vis =I r,ave / I m,ave Visible light transmittance T vis , where I r,ave is the average illuminance received by the lower surface of the light-transmitting roof test piece, I m,av It is the average illuminance received by the outer surface of the light-transmitting roof test piece.

[0104] In order to more accurately obtain the light and thermal performance of the light-transmitting roof, the following method can be used to correct the test results. The S6: calculating the light and thermal performance of the spray-type light-transmitting roof based on the average radiation intensity and the average illuminance received by the outer surface of the light-transmitting roof test piece and the thermal parameters includes:

[0105] S65: determining the amount of residual water on the outer surface of the light-transmitting roof test piece according to the spray flow rate and the water discharge amount on 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: determining the thickness of the water film on the outer surface of the light-transmitting roof test piece according to the amount of residual water on the outer surface of the light-transmitting roof test piece;

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

[0109] S67: Determine the evaporation amount of water on the outer surface of the light-transmitting roof test piece according to the outer surface temperature of the light-transmitting roof test piece and the ambient air humidity;

[0110] The evaporation capacity mevap is the evaporation rate per unit area (kg / (m 2 ·s));

[0111] mevap=hm[Psat(Tsurf)-Pv,air].hm is the mass transfer coefficient (kg / (m 2 ·s·Pa)) This value 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 the indoor / outdoor air. It can be calculated from relative humidity, air pressure, and temperature.

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

[0113] S68: The amount of water evaporated from the outer surface of the light-transmitting roof test piece is used to calculate the indoor heat gain Q from solar radiation. t Make corrections and use the corrected solar radiation indoor heat gain Q t Update the solar heat gain coefficient SHGC;

[0114] That is, from Q t After deducting the heat taken away by the evaporation of water on the outer surface, the corrected Q is obtained. t Then according to the corrected solar radiation indoor heat gain Q t Update the solar heat gain coefficient SHGC;

[0115] S68: Obtaining an optical correction factor according to the thickness of the water film;

[0116] This step first establishes the correlation between the water film thickness and the optical transmittance change. A set of corresponding relationships between "water film thickness" and "optical transmittance 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: when the water film is in a certain thickness range, the transmittance of the light-transmitting material increases or decreases compared to the dry condition (which can be expressed as a ratio or percentage).

[0118] The "transmittance adjustment" for the roof under the current operating conditions is determined by combining the "water film thickness - optical transmittance change" relationship. This adjustment is defined as the "optical correction factor." For example, if the transmittance under dry conditions is a certain baseline value, and the transmittance change due to the water film is within a certain percentage range, this percentage change or ratio change can be used as the optical correction factor. If the optical correction factor is greater than 1, the transmittance has increased compared to dry conditions due to the water film; if the optical correction factor is less than 1, the transmittance has decreased. This optical correction factor is output and stored as key reference data for subsequent corrections to solar radiation transmittance and visible light transmittance.

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

[0120] In this step, the original solar radiation transmission ratio is multiplied by the optical correction factor to obtain the corrected solar radiation transmission ratio. The original visible light transmittance is multiplied by the 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 an example of using the device and method of the present invention to detect the light and heat performance of a translucent roof under different boundary conditions.

[0122] Example 1

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

[0124] At the same time, the detection device and method provided by the present invention are used to reproduce the boundary conditions of the above calculation procedure, wherein the external environmental box is set at a temperature of 30°C and a wind speed of 2m / s, and the solar radiation intensity received by the surface of the glass specimen is ensured to be 500W / m 2 , the temperature of the heat metering box is set to 25℃. After the device is running stably, the SHGC measured value is 0.702 according to the formula, and the relative error with the theoretical calculated value is only 0.3%, indicating that the accuracy of the detection device is high. The curve obtained by SHGC measurement can be found in Figure 9 shown.

[0125] Example 2

[0126] In order to further verify the accuracy of the detection device based on Example 1, the boundary conditions were changed according to GB / T30592-2014 "Test method for solar heat gain coefficient of transparent enclosure structure". The external environmental chamber was set at a temperature of 26.5℃ and a wind speed of 2m / s. The solar radiation intensity received by the glass specimen surface was ensured to be 600W / m 2 The temperature of the heat metering box is set to 25° C. After the device is running stably, the SHGC value calculated by the method of the present invention is 0.73, and the relative error with the theoretical calculated value is only 4.3%, indicating that the detection device has high accuracy.

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

[0128] The above description is only a specific embodiment of the present invention. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention.

Claims

1. A device for detecting the light and heat performance of a translucent roof under various meteorological conditions, characterized in that: include: An external environment simulation device, comprising an external environment box and an artificial light source, wherein the artificial light source is installed in the external environment box, and the external environment simulation device and the spray device are used to simulate environmental conditions of different steady-state meteorological conditions and dynamic meteorological conditions under spray conditions; A light-transmitting roof test piece is installed at the lower side wall of the external environmental box, and the light-transmitting roof test piece is located below the artificial light source; A spray device comprising a nozzle, the nozzle being located below the artificial light source and above the light-transmitting roof test piece; the external environmental chamber further comprising 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 light-transmitting roof test piece; a heat metering device, comprising a heat metering box, a third light source radiation intensity sensor, and a second illumination sensor, wherein the heat metering box is located below the light-transmitting roof test piece; a supply and return air system, used for circulating airflow into the heat metering device, wherein the supply and return air system is in communication with 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; The control system 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. 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 detecting the light and thermal 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 solar radiation simulated by the artificial light source is adjustable in the range of 0 to 1000 W / m 2 .

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

4. The device for detecting the light and thermal performance of a light-transmitting roof under various weather conditions according to claim 1, characterized in that: The temperature adjustment range of the external environment simulation device is 10 to 40°C.

5. The device for detecting the light and thermal performance of a light-transmitting roof under various weather conditions according to claim 4, characterized in that: The relative humidity adjustment range of the external environment simulation device is 40% to 98%.

6. The device for detecting the light and heat performance of a light-transmitting roof under various meteorological conditions according to claim 4, characterized in that: The spray device also includes a spray water supply pipe, the spray water supply pipe is connected to a water source, the nozzle is connected to the spray water supply pipe, and the artificial light source is turned on to irradiate the light-transmitting roof test piece from above the spray.

7. A method for testing the light and heat performance of a translucent roof under various meteorological conditions, characterized in that: The light-transmitting roof thermal performance detection device under various meteorological conditions according to any one of claims 1 to 6 is used for detection, the method comprising: Get preset experimental requirements; Determine artificial light source control parameters according to preset experimental requirements; Controlling the operation of the artificial light source according to the artificial light source control parameters; Control the water supply and return system to circulate water to the supply and return air system, control the supply and return air system to circulate air to the heat metering box, and control the spray device to spray above the light-transmitting roof test piece; Obtain the average radiation intensity and average illuminance received by the outer surface of the light-transmitting roof test piece under spray conditions, as well as the thermal parameters of the supply and return air system, supply and return water system, heat metering box, test piece frame and light-transmitting roof test piece; The light and heat performance of the spray-type light-transmitting roof is calculated according to the average radiation intensity of the outer surface of the light-transmitting roof test piece, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters.

8. The method for detecting the light and heat performance of a light-transmitting roof under various meteorological conditions according to claim 7, characterized in that: Determining the artificial light source control parameters, the supply and return air system control parameters, and the supply and return water system control parameters according to the preset experimental requirements includes: Obtain the preset average radiation intensity of the outer surface of the light-transmitting roof test piece according to the experimental requirements; Obtain the corresponding relationship 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; The preset output radiation intensity of the corresponding artificial light source is determined according to the preset average radiation intensity of the outer surface of the transparent roof test piece and the corresponding relationship between the average radiation intensity of the outer surface of the transparent roof test piece and the output radiation intensity of the artificial light source. When conducting dynamic experiments, the hourly setting value of the artificial light source is calculated according to the required hourly solar radiation intensity.

9. The method for detecting the light and thermal performance of a light-transmitting roof under various meteorological conditions according to claim 7, characterized in that: The corresponding relationship 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 is obtained by: S222: Dividing the outer surface of the light-transmitting roof test piece into a plurality of area regions; S223: Control the artificial light source to output according to the set output radiation intensity; S224: measuring the output radiation intensity of the artificial light source in each area; S225: Calculating the average output radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece corresponding to the output radiation intensity set by the current artificial light source based on the output radiation intensity of the artificial light source in each area; S226: Calculating the average output radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece based on the output radiation intensity of the artificial light source in each area; S227: after changing the set artificial light source output radiation intensity, repeat steps S224 to S226 until the average output radiation intensity of the artificial light source corresponding to all the set artificial light source output radiation intensities is obtained; S228: Using a regression model, fitting the average output radiation intensity of the artificial light source corresponding to the output radiation intensity of each set artificial light source is performed to obtain a corresponding relationship 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.

10. The method for detecting the light and thermal performance of a light-transmitting roof under various meteorological conditions according to claim 7, characterized in that: The method of obtaining the average radiation intensity and the average illumination received by the outer surface of the light-transmitting roof test piece under the spray condition, as well as the thermal parameters of the second air supply and return system, the water supply and return system, the heat metering box, the test piece frame and the light-transmitting roof test piece, includes: Get the output radiation intensity of the current artificial light source; Determine the average radiation intensity of the outer surface of the corresponding light-transmitting roof test piece according to the corresponding relationship between the output radiation intensity of the current artificial light source and 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; Obtaining a corresponding relationship between an average radiation intensity on an outer surface of a light-transmitting roof test piece and an average illuminance received on the outer surface of the light-transmitting roof test piece; The average illuminance received by the corresponding outer surface of the light-transmitting roof test piece is determined according to the average radiation intensity of the outer surface of the light-transmitting roof test piece and the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illuminance received by the outer surface of the light-transmitting roof test piece.

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